Disclosed in the present invention are a residual-current detection module, an electric leakage protection apparatus, and a charging pile. The residual-current detection module comprises: a fluxgate current sensor, which is used for acquiring a first voltage signal that represents a neutral/live-wire current vector difference; a window comparator module, which is used for comparing the first voltage signal with a first reference threshold value and a second reference threshold value, which first reference threshold value is greater than the second reference threshold value, and according to a comparison result, generating a first digital signal, which represents whether an A-type electric leakage event occurs in a wire to be subjected to detection; and a micro-controller, which is used for comparing the first voltage signal with a third reference threshold value and a fourth reference threshold value, which third reference threshold value is greater than the fourth reference threshold value, and then performing logical OR determination on the first digital signal to generate a second digital signal, wherein the second digital signal is used for determining whether it is necessary to execute a corresponding protection action. The residual-current detection module in the present invention can reduce the cost and improve the performance.
H02H 7/26 - Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occurred
2.
MODALITY SWITCHING CONTROL METHOD AND SYSTEM, AND COMPUTER DEVICE AND STORAGE MEDIUM
Disclosed in the present application are a modality switching control method and system, and a computer device and a storage medium, which are applied to a resonant converter, which has operation modalities comprising a full-bridge LLC modality and a half-bridge LLC modality. The control method comprises: adjusting a control amount according to an input voltage, output voltage and output current of a resonant converter; performing secondary adjustment on the control amount according to the determination of an error amount; and performing loop calculation. The modality switching control method provided by the present application has higher practicability and reliability, and can be directly implemented by means of controller software programming, without the need to add a hardware circuit, and the control method has higher flexibility; and the present application can provide a broader input/output voltage range, and can achieve a short recovery time and good voltage overshoot/undershoot during mode switching, so as to reduce device stress, such that the system has better dynamic characteristics.
H02M 3/335 - Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
Disclosed in the present application are a control method and apparatus, and a switch power source. The control method comprises: a driving time sequence configuration method for switch tubes Q1 and Q2, said method comprising: configuring switch tubes Q1 and Q2 to operate in a non-complementary driving time sequence, and starting to connect the switch tube Q2 only within a time period from a first moment which is after the disconnection of the switch tube Q1 in the present operating cycle to a moment which is before the connection of the switch tube Q1 in the next operating cycle, wherein the first moment is the moment at which a primary-side excitation inductor current is demagnetized to zero, a switch power source starts resonance at a primary-side circuit from the first moment, and a first voltage at a half-bridge midpoint starts to rise to form an inflection point. The control method further comprises: a method for performing feedback control on an output voltage of a switch power source, said method comprising: sampling a first voltage at a half-bridge midpoint at the moment of an inflection point and second voltages at two ends of a resonant capacitor Cr, and performing closed-loop control on a switch power source according to the first voltage and the second voltages. The present application can reduce the cost and design complexity of a switch power source in which asymmetric half-bridge flyback resonant converter topology is used, and also realizes soft switching of the switch power source.
H02M 1/08 - Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
H02M 3/335 - Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
4.
PROTECTION CONTROL CIRCUIT AND SWITCH POWER SUPPLY
Disclosed in the present application are a protection control circuit and a switch power supply. The protection control circuit comprises first and second switch tubes, a sampling module, and first and second comparison control modules, wherein the first and second switch tubes are connected in series in a first power line; the sampling module is connected in a second power line to acquire first and second voltage signals for representing the magnitude of a current in the second power line; and the first and second comparison control modules respectively compare the first and second voltage signals with first and second reference voltages, and then control the turning-on and turning-off of the first and second switch tubes. The sampling module comprises a resistor R110, a resistor R111 and a bypass module, wherein the resistor R110 and the resistor R111 are connected in series in the second power line, and the bypass module is connected to the resistor R111 in parallel and is used for making the resistor R111 connect to the second power line only when the switch power supply is short-circuited. The present application can apply the dual-control function of overcurrent protection and short-circuit protection to a switch power supply, and limit the magnitude of a current during overcurrent protection and the magnitude of the current during short-circuit protection according to actual application situations.
H02H 3/08 - Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition, with or without subsequent reconnection responsive to excess current
H02H 3/00 - Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition, with or without subsequent reconnection
H02H 7/10 - Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for convertersEmergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for rectifiers
5.
CONTROL METHOD AND CONTROL CIRCUIT FOR LLC CONVERTER
The present application discloses a control method and circuit for a clamp LLC converter, applied to an LLC resonant converter composed of an inverter circuit, a resonant circuit, a clamp branch, a transformer, and a rectifier and filter circuit. According to the method of the present application, on the basis of charge mode control of LLC, adaptive switching of two modes of the converter is achieved by measuring the driving pulse width of switching transistors of the inverter circuit and comparing the driving pulse width with a pulse width threshold, specifically, when the driving pulse width is greater than the threshold, variable-frequency PFM control is used, and the output voltage gain is changed by changing the working frequency; and when the driving pulse width is smaller than the pulse width threshold, fixed-frequency duty ratio shift PWM control is used, and the output voltage gain is changed by changing the duty ratio. According to the present application, by measuring the driving pulse width, switching of variable-frequency PFM control and fixed-frequency PWM control is achieved, multi-modal control of the charge-controlled LLC converter is achieved, the voltage gain range of the charge-controlled LLC converter is widened, and ZVS can be achieved for all switching transistors at the same time, so that the overall efficiency of the circuit is high.
H02M 1/08 - Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
H02M 3/335 - Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
6.
STARTING CONTROL METHOD AND APPARATUS FOR LLC RESONANT CIRCUIT, AND STORAGE MEDIUM
Disclosed in the present application are a starting control method and apparatus for an LLC resonant circuit, and a storage medium. The method comprises: in a first mode, setting the voltage of a resonant capacitor to zero; in a second mode, turning on an upper bridge arm switch transistor to charge the resonant capacitor, such that the current of a resonant inductor reaches the maximum current value of the resonant inductor, and the voltage of the resonant capacitor reaches a first set voltage; and in a third mode, turning on a lower bridge arm switch transistor to charge the resonant capacitor, such that the voltage of the resonant capacitor reaches a second set voltage. During the starting process, the present application adjusts the timing sequence of the switch transistors in the bridge switch circuit so as to regulate charging of the resonant capacitor in phases, thus achieving voltage balance of the resonant capacitor, and effectively shortening the starting time. In addition, during the process of switching the turning-on of the upper bridge arm switch transistor and the lower bridge arm switch transistor, the present application achieves ZVS, thus reducing the problem of hard switching interference, and effectively reducing the starting impact currents of LLC resonant converters.
H02M 1/36 - Means for starting or stopping converters
H02M 1/08 - Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
H02M 1/32 - Means for protecting converters other than by automatic disconnection
H02M 3/00 - Conversion of DC power input into DC power output
H02M 3/335 - Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
7.
SOLDERING TIN MATERIAL AND PREPARATION METHOD THEREFOR
A soldering tin material and a preparation method therefor. The soldering tin material comprises the following components in percentage by weight: 41-60% of Bi, 0.5-4.5% of Ag, 0.1-2% of Cu, 0.01-0.3% of Co and the balance of Sn. According to the soldering tin material, the dropping resistance and the thermal shock resistance of the soldering tin material are effectively improved by controlling metal components and the proportion of the metals. Moreover, the anti-aging performance, the cold and hot cycle property and the tensile property of the soldering tin material can be improved, the wetting time can be shortened, and the wetting power and the thermal fatigue property are improved.
Disclosed in the present invention is a control method for a resonant converter. The control method comprises: dividing an input voltage into two intervals by means of a set switching threshold value; when the input voltage is greater than the set threshold value, if a converter works in a full-bridge mode, calling a full-bridge to half-bridge transient process driving pulse, and then adjusting the full-bridge mode to a half-bridge mode to perform driving time sequence closed-loop control; and when the input voltage is less than the set threshold value, if the converter works in the half-bridge mode, calling a half-bridge to full-bridge transient process driving pulse, and then adjusting the half-bridge mode to the full-bridge mode to perform driving time sequence closed-loop control. The control method in the present invention implements smooth switching between a full-bridge mode and a half-bridge mode by inserting a transient process driving pulse while effectively broadening the voltage gain of a converter, optimizes the overshoot and undershoot of an output voltage, also guarantees a soft switching characteristic of a power semiconductor device, avoids the problems of a power semiconductor device during a switching process of voltage stress rising and EMI performance being poor, and has extremely high levels of practicability and reliability.
H02M 3/00 - Conversion of DC power input into DC power output
H02M 3/335 - Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
Disclosed in the present invention are a control method and system for a resonant converter, which are applied to wide-voltage application occasions. In a high-gain stage, an output voltage is adjusted by using frequency conversion control, and a switch frequency is lower than a series resonant frequency; in a middle-gain stage, the output voltage is adjusted by using frequency-raising and phase-shifting hybrid control, the switch frequency is higher than the series resonant frequency, and phase-shifting control is performed between primary-side switch transistors, or in the middle-gain stage, the output voltage is adjusted by using PWM control, and the switch frequency is equal to the series resonant frequency; and in a low-gain stage, the output voltage is adjusted by using mode-switching frequency conversion control, a resonant converter is in a half-bridge mode, and the output voltage is adjusted by means of controlling the switch frequency. Therefore, the hybrid control method is simple, the frequency adjustment range is effectively reduced, the gain adjustment capability of a resonant converter is improved, and improvements in the efficiency and power density of a converter are facilitated in wide-voltage applications.
H02M 3/335 - Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
H02M 1/088 - Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
10.
SIGNAL ZERO-CROSSING DETECTION CIRCUIT AND SWITCHING POWER SUPPLY
A signal zero-crossing detection circuit and a switching power supply. The signal zero-crossing detection circuit comprises a signal sampling circuit and a zero-crossing identification circuit. During the operation of the signal zero-crossing detection circuit, when an alternating-current signal is at a positive half-wave, the signal sampling circuit converts the alternating-current signal into a voltage of a first set voltage plus an amplitude voltage and then outputs same to the zero-crossing identification circuit, and the zero-crossing identification circuit performs identification and determination and then outputs a low level; when the alternating-current signal is at a negative half-wave, the signal sampling circuit converts the alternating-current signal into a voltage of the first set voltage minus the amplitude voltage and then outputs same to the zero-crossing identification circuit, and the zero-crossing identification circuit performs identification and determination and then outputs a low level; and when the alternating-current signal is at zero, the signal sampling circuit converts the alternating-current signal into the first set voltage and then outputs same to the zero-crossing identification circuit, and the zero-crossing identification circuit performs identification and determination and then outputs a high level.
Disclosed in the present invention are a control method and apparatus, and a medium, a processor and a switching power source. The control method is applied to a resonant converter, and comprises the following steps: acquiring a first voltage signal that represents the magnitude of an output voltage of a resonant converter; and adjusting a switching frequency fs and a phase shift angle θ according to the first voltage signal, and then adjusting the output voltage of the resonant converter, so as to realize closed-loop feedback control over the resonant converter, wherein the switching frequency fs is always greater than a resonant frequency fr of an LLC resonant cavity. The control method of the present invention can reduce the circulation loss of a primary side of a transformer under general phase shift control, and improve the overall efficiency of a resonant converter; in addition, a rectifier tube at a secondary side utilizes frequency-increase phase-shift control to adjust an output voltage, such that the gain adjustment capability of the resonant converter is also improved, and thus the design of a transformer can be optimized, thereby improving the conversion efficiency of the resonant converter and increasing the power density thereof in a wide-voltage application setting.
H02M 3/335 - Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
The present application relates to a current-sharing circuit, a power supply module, and a power supply system. The current-sharing circuit comprises an amplification circuit, an error amplifier and a current conversion circuit. The circuit only requires one eight-pin dual-operational amplifier IC to complete current sharing control in cooperation with a simple periphery; and the circuit scheme does not influence the voltage precision during a current-sharing process, and can fulfill the advantages of high current-sharing precision, high voltage precision, a rapid dynamic response, good loop stability, etc.
The present invention provides a through hole reflow soldering method. The through hole reflow soldering method comprises: placing multiple parts to be soldered on multiple bearing positions of a through hole reflow soldering device; performing detection on the multiple bearing positions of the through hole reflow soldering device, to obtain vacant bearing position information, the vacant bearing position information comprising the location of a vacant bearing position; performing a through hole closing operation on the vacant bearing position according to the vacant bearing position information; and performing a soldering operation by means of the through hole reflow soldering device loaded with the multiple parts. According to a technical solution provided by the present application, the problem of a through hole reflow soldering method in the prior art easily damaging an element on a part to be soldered may be solved.
Disclosed in the present invention is a conduction-interference filter circuit for a high-power switch power source, the circuit comprising a common-mode inductor and further comprising a hollow coil, wherein the common-mode inductor is an annular inductor of an annular magnetic core, and one face of the common-mode inductor is provided with the hollow coil; the hollow coil is a spiral hollow coil, and the central axis of the middle hole of the hollow coil is coaxial or parallel to the central axis of the annular magnetic core of the common-mode inductor; after the hollow coil and the common-mode inductor are energized, a magnetic field generated by the hollow coil interacts with magnetic flux leakage of the common-mode inductor, such that the magnetic flux leakage of the common-mode inductor is increased, so as to increase the differential-mode component of the common-mode inductor; and the hollow coil uses the magnetic flux leakage of the common-mode inductor as a virtual "magnetic core", such that the differential-mode inductance value of the hollow coil is increased. By means of the present invention, the conduction interference of a high-power switch power source product can be effectively filtered out.
Disclosed in the present invention are a starting control circuit and a switching power supply system. The circuit comprises: a voltage measurement and action unit, a backlash compensation and starting control unit, and a linear voltage stabilization unit. In the present invention, the quantity of electric charges in a starting energy storage capacitor is stored by means of a high-voltage starting circuit; by means of a starting control circuit, even if the voltage of a starting energy storage capacitor end reaches an operating voltage threshold value of a control chip, the control circuit does not supply power to the chip until the quantity of electric charges stored in the starting energy storage capacitor is sufficient to support the energy required at the starting moment of the chip; and before the voltage of the starting energy storage capacitor end drops to a chip turning-off voltage threshold value, the power supply voltage of an auxiliary power supply system can be established, and the auxiliary power supply system continues to supply power to the control chip, such that the switching power source system operates normally.
H02M 1/36 - Means for starting or stopping converters
H02M 3/158 - Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
16.
PIN STRUCTURE OF MODULE POWER SUPPLY, AND MODULE POWER SUPPLY
A pin structure of a module power supply, and a module power supply, wherein the pin structure comprises: a plastic body (10), wherein the plastic body (10) is provided with an accommodating region; metal pins (20), wherein the metal pins (20) are integrally formed with and connected to the plastic body and located in the accommodating region, a first surface (21) of each metal pin (20) is attached to the plastic body (10), and a second surface (22) of the metal pin (20) opposite to the first surface (21) is exposed to the plastic body (10); and an interlocking structure, comprising protrusions (31) and recesses (32), one of the protrusions (31) and the recesses (32) being located on the plastic body (10), the other being located on the metal pin (20), the protrusion (31) extending into the recess (32) to form an interlock and prevent the metal pin (20) from coming out of the plastic body (10). The present invention solves the problems in the prior art that pins of a module power supply are thick, and the metal pins are difficult to weld and assemble.
H01L 23/10 - ContainersSeals characterised by the material or arrangement of seals between parts, e.g. between cap and base of the container or between leads and walls of the container
H01L 23/48 - Arrangements for conducting electric current to or from the solid state body in operation, e.g. leads or terminal arrangements
Disclosed in the present invention are a cascade circuit and a control method therefor. The cascade circuit comprises a preceding-stage buck-boost circuit and a post-stage isolation switch power supply circuit, wherein the buck-boost circuit comprises a switch tube Q1 to a switch tube Q4, an inductor L and a capacitor C1; one end of the switch tube Q1 is a positive input of the buck-boost circuit, and the other end thereof is connected to one end of the switch tube Q2 and one end of the inductor L at the same time; the other end of the inductor L, one end of the switch tube Q4 and one end of the capacitor C1 are connected together to be a positive output of the buck-boost circuit; the other end of the capacitor C1 is connected to one end of the switch tube Q3; and the other end of the switch tube Q2, the other end of the switch tube Q4 and the other end of the switch tube Q3 are connected together to be an input power supply ground of the buck-boost circuit. By means of the present invention, the device model selection, EMI and efficiency of a switch tube can be greatly optimized by using an active clamping circuit composed of a switch tube Q4, a switch tube Q3 and a capacitor C1 in combination with a buck-boost control method, thereby resulting in a reduction in the cost and the volume.
H02M 3/335 - Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
18.
LLC RESONANT CONVERTER AND CONTROL METHOD THEREFOR
A control method for an LLC resonant converter. The control method comprises: dividing an input voltage into four voltage segments, namely, a low voltage, a medium-low voltage, a medium-high voltage and a high voltage, and correspondingly using a full-bridge PFM control mode, a full-bridge PWM control mode, a half-bridge PFM control mode and a half-bridge PWM control mode, respectively. The control method is applicable to a wide input voltage range, realizes steady-state control over an LLC resonant converter, can make the LLC resonant converter maintain a high efficiency within the whole input voltage range, and can also be applied to the occasion where a wide output voltage occurs.
H02M 3/335 - Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
H02M 7/219 - Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a bridge configuration
19.
CONTROL METHOD AND CONTROL APPARATUS FOR LLC RESONANT CIRCUIT
Provided in the present application are a control method and control apparatus for an LLC resonant circuit. The LLC resonant circuit comprises a full-bridge inverter circuit. The method comprises: when an input voltage of an LLC resonant circuit is greater than a set threshold value and the LLC resonant circuit is in a full-bridge mode, controlling time points corresponding to rising edges of driving voltages of some switch tubes to remain unchanged, and controlling time points corresponding to falling edges thereof to change according to a first rule, such that the LLC resonant circuit is converted from the full-bridge mode into a half-bridge mode; and when the input voltage is less than or equal to the set threshold value and the LLC resonant circuit is in the half-bridge mode, controlling the time points corresponding to the rising edges of the driving voltages of some switch tubes to remain unchanged, and controlling the time points corresponding to the falling edges thereof to change according to a second rule, such that the LLC resonant circuit is converted from the half-bridge mode into the full-bridge mode. The method guarantees the good reliability of a circuit.
H02M 3/335 - Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
H02M 1/44 - Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
Disclosed in the present invention is a control method for a resonant converter. The resonant converter comprises an inverter circuit, a resonant circuit, a clamping branch, a transformer and a secondary rectifying and filtering circuit. An input voltage is divided into three intervals by means of a first set voltage and a second set voltage, wherein the first set voltage is less than the second set voltage; and when "the first set voltage < the input voltage ≤ the second set voltage" is satisfied, the resonant converter operates in an asymmetric PWM mode: the proportion of a midpoint voltage Vab of a left bridge arm and a right bridge arm of the inverter circuit being one of a positive voltage and a negative voltage is 50%, the proportion of same being the other voltage is less than 50%, and a gain of the converter is controlled by means of adjusting the proportions of the midpoint voltage Vab being the positive voltage and the negative voltage. The present invention can make a voltage gain of a resonant converter within a whole input voltage range be continuous without causing any voltage jump, there is no need to add a transition process, and the frequency variation range is relatively narrow.
H02M 3/335 - Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
21.
CONTROL METHOD AND CONTROL APPARATUS FOR LLC RESONANT CONVERTER
A control method and control apparatus for an LLC resonant converter. The LLC resonant converter comprises an inverter circuit (10) and an LLC resonant circuit (20), wherein the inverter circuit (10) comprises switch tubes Q1 to Q4, and the LLC resonant circuit (20) comprises a clamping branch composed of two switch tubes. The control method comprises: when an LLC resonant converter is converted from a full-bridge mode into a half-bridge mode, the duty cycle of a switch tube Q4 gradually increasing to 100%, and when the frequency of a switch tube Q1 is the resonant frequency fr of an LLC resonant circuit and the duty cycle is 50%, controlling a clamping branch to be switched off, and then adjusting the frequency of an inverter circuit (10) until an output voltage reaches an expected value; and when the LLC resonant converter is converted from the half-bridge mode into the full-bridge mode, the duty cycle of the switch tube Q4 gradually decreasing to be the same as the duty cycle of the switch tube Q1, and when the frequency of the switch tube Q1 is the resonant frequency fr of the LLC resonant circuit and the duty cycle is 50%, controlling the clamping branch to be switched on, and then adjusting the duty cycle of the inverter circuit (10) until the output voltage reaches the expected value.
H02M 3/335 - Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
H02M 1/36 - Means for starting or stopping converters
H02M 1/32 - Means for protecting converters other than by automatic disconnection
22.
PEAK AND VALLEY TURN-ON CONTROL METHOD AND CONTROLLER
Disclosed are a peak and valley turn-on control method and controller, which are applied to a synchronous rectification circuit. The synchronous rectification circuit comprises a main switching tube, a synchronous rectifier tube, and an energy storage inductor. The method comprises the following steps: obtaining a maximum switching frequency limit end time point of the synchronous rectification circuit; comparing voltages at two ends of the energy storage inductor at the end time point to obtain a comparison result signal; according to the working status of the synchronous rectification circuit and a predetermined condition, selecting to execute one of the following actions: starting timing at a time point when the comparison result signal is inverted, and after first predetermined time is over, controlling the main switching tube to be turned on at a peak or valley of a node connecting the main switching tube and the synchronous rectifier tube; and starting timing at the time point when the comparison result signal is inverted, and after second predetermined time is over, controlling the synchronous rectifier tube to be turned on at the peak or valley of the node connecting the main switching tube and the synchronous rectifier tube. The present invention can improve the power density and efficiency of a switching converter, reduce volume, and reduce EMI and costs.
H02M 7/797 - Conversion of AC power input into DC power outputConversion of DC power input into AC power output with possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
23.
CONTROL METHOD AND CONTROL CIRCUIT FOR BUCK CONVERTER
The present invention relates to the technical field of switch power supplies. Disclosed are a control method and control circuit for a BUCK converter. The control method is mainly used for solving the problem of a low efficiency in a DCM operating mode due to it being difficult for a main power switch tube to achieve a ZVS caused by the insufficiency of a negative current provided by a power inductor in the DCM operating mode. The control method is mainly implemented by means of a digital control scheme. The method comprises: an inductor current sampling circuit detecting a zero-crossing signal of a current of an inductor, and sending the zero-crossing signal to a DSP; the DSP receiving the zero-crossing signal, and performing counting; when a count value n ≥ 2, the DSP sending a synchronous rectifier tube switching-on signal, such that a synchronous rectifier tube is switched on; an output capacitor reversely charging a power inductor, such that a negative current of the inductor is increased; and when the negative current is increased to a given value, switching off the synchronous rectifier tube, and switching on a main power tube after a dead time, such that the main power tube can achieve a ZVS.
H02M 3/158 - Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
H02M 1/088 - Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
Disclosed in the present invention is a switch power supply structure, comprising a housing, a base and a circuit board, wherein the housing and the base enclose a cavity that accommodates the circuit board, with an opening of the cavity forming a first heat dissipation channel; the housing is composed of a top plate and two side plates, and the housing is provided with a plurality of heat dissipation holes in an array arrangement including polygonal holes that form a second heat dissipation channel; and the base is composed of a bottom plate and a side plate, and the base is provided with protruding clamping points that shape pre-positioning for the circuit board. According to the present invention, the first heat dissipation channel and the second heat dissipation channel are formed, and the heat dissipation holes of the second heat dissipation channel are configured to have a polygonal structure, thereby increasing the heat dissipation area and achieving a simple structure and a good heat dissipation effect. In addition, the structures of the housing and the base are optimized to increase the degree of automation of product assembly, so as to reduce the cost of materials used to form the entire power supply housing structure.
Disclosed in the present invention is a series coupling converter. The series coupling converter at least comprises two switch converters, wherein there is a series connection relationship between the switch converters, and there is a mutual coupling relationship between main power inductive devices in the switch converters. The series coupling converter further comprises at least one current sharing unit, wherein the current sharing unit is added to a branch outside a main power switch tube clamping network, and is used for shaping, when main power switch tubes in the switch converters are turned on, a pulse coupling current flowing through the main power switch tubes into a low-amplitude direct current. By means of the present invention, it can be ensured that the current in switch tubes is consistent without changing voltage sharing performance, thereby reducing the switch loss of a power switch tube, and enhancing the reliability of a circuit.
H02M 3/335 - Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
26.
PLASTIC-PACKAGED POWER SUPPLY PRODUCT AND PLASTIC PACKAGING METHOD THEREFOR
The present invention provides a plastic-packaged power supply product and a plastic packaging method therefor. The power supply product comprises a PCB, a top-layer plastic package, a bottom-layer plastic package, discrete devices, a magnetic device, and pins; the discrete devices are distributed on upper and lower sides of the PCB; the magnetic device is assembled on the PCB; the pins are connected to two sides of the PCB; the pins comprise metal pins and a plastic body; a portion of each metal pin is wrapped by the plastic body, and a metal pad in the portion is exposed to the surface of the plastic body from a first groove formed in the surface of the plastic body; the metal pad is used for connecting the pin to the plastic-packaged power supply product; a through hole is formed in the center of the metal pad; a third groove is formed in the plastic body at the position corresponding to the through hole; the through hole is communicated with the third groove for observing a soldering condition from the outside of the product; and the portion of each metal pin that is not wrapped by the plastic body is used as a product pin. In the present invention, the through hole of each metal pin is fully utilized, such that the inspection of the pin after soldering is facilitated, and the type of a soldering technological method for pins is increased.
A bridgeless voltage-drop power factor correction circuit, comprising an MOS transistor Q1, an MOS transistor Q2, a diode D1, a diode D2, a diode D3, a diode D4, a capacitor C1, an inductor L1, an inductor L2 and a resistor R1. In the present invention, an existing power factor correction circuit is improved, and by means of removing a full-bridge rectifier circuit, when the MOS transistor Q1 is switched on, the diode D3 in a main loop is connected in series to the MOS transistor Q1, or when the MOS transistor Q2 is switched on, the diode D2 in the main loop is connected in series to the MOS tube Q2, thereby reducing the number of diodes which are connected in series in the main loop during working, reducing the rectification loss of the circuit, and realizing the characteristics of no bridge and voltage-drop power factor correction.
H02M 1/42 - Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
H02M 7/217 - Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
H02M 1/32 - Means for protecting converters other than by automatic disconnection
Provided is a double-sided plastic package power supply product, comprising a PCB, a plastic package body, electric contacts and pins, wherein the electric contact is connected to the pin and the PCB; the pin comprises a plastic body and a metal body; the metal body is embedded in the plastic body; the plastic body is used to limit the metal body; and one end of the metal body is connected to the electric contact, and the other end of the metal body is used as a plug pin. A metal terminal is connected to a PCB substrate and wrapped in the plastic package body, and the surface of the portions of the metal terminal that protrude from the PCB substrate can be exposed on the surface of the product by means of cutting or thinning so as to form the electric contacts; or a side surface of the PCB is provided with metal blind holes and can be exposed on the surface of the product by means of cutting so as to form the electric contacts. The present invention is conducive to reducing the volume of the product and improving the welding convenience and welding reliability of a bonding pad. In addition, the structure can be compatible with both pin designs of a SMD package product and a DIP package product, thereby simplifying the product design.
Disclosed are a power-loss delay circuit and a detection control circuit thereof. The power-loss delay circuit and the corresponding detection control circuit are added onto a flyback circuit, such that when a product is working normally, an energy storage capacitor C3 is charged, and when an input power supply of the product is cut off, the detection control circuit detects that an input voltage of the product drops to a set value and triggers the control circuit to drive a switch transistor Q1 to be turned on, so that the energy of an energy storage capacitor C1 is released, thereby keeping the product working continuously for a period of time. The power-loss delay circuit and the detection control circuit thereof have no effect on the normal working state of the product. When the input power is cut off, capacitance stored in an external capacitor is introduced in time to keep the product working continuously. In the present invention, extended power-loss holding time, small inrush current, high efficiency, simple circuit structure, and high reliability are achieved, and a power-loss delay protection threshold may be automatically adjusted according to change in under-voltage points, making systematic application of modular power supply more convenient.
H02J 9/06 - Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over
H02J 7/34 - Parallel operation in networks using both storage and other DC sources, e.g. providing buffering
H02M 3/335 - Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
G01R 31/28 - Testing of electronic circuits, e.g. by signal tracer
30.
POWER-DOWN DELAY PROTECTION CIRCUIT AND CONTROL METHOD
Disclosed are a power-down delay protection circuit and control method. A primary winding of a switched-mode power supply is connected to an auxiliary winding in parallel to couple an output voltage. When the power supply works normally, the coupled primary side voltage is lifted by means of the turn-to-turn ratio conversion to charge and store energy for an energy storage capacitor C3 electrically connected to a switch tube Q1 in series. When the power supply is turned off, and an input voltage falls out of the normal input range, the switch transistor Q1 is controlled to be turned on, so that the energy stored in the energy storage capacitor C3 is released to an input end of the switched-mode power supply by means of the switch tube Q1 for continuing providing energy for a load. According to the present invention, not only the power-down holding time is prolonged, but also the power-down holding time does not change with the input voltage. The present invention is very suitable for a switched-mode power supply having an ultra-wide input voltage range. According to the present invention, the power-down holding time is prolonged, the impact current is low, the efficiency is high, the circuit structure is simple, the reliability is high, and the systematic application of a module power supply is more convenient.
H02J 9/06 - Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over
H02J 7/34 - Parallel operation in networks using both storage and other DC sources, e.g. providing buffering
31.
VOLTAGE DOUBLING OUTPUT CIRCUIT OF FORWARD/FLYBACK CONVERTER
Disclosed in the present invention is a voltage doubling output circuit of a forward/flyback converter, being applied to a switching power supply product having low voltage input and high voltage output. The voltage doubling output circuit performs voltage doubling on the voltage of a transformer winding and then supplies the voltage to an output end, thereby being capable of effectively reducing the number of turns of the transformer winding, and reducing the design difficulty of a transformer. A capacitor C3 in the present invention serves as an energy storage device bridged between a transformer winding port and an output port, and forms a loop for connecting the transformer and the output port when the transformer is in a flyback working process, such that the transformer also can supply energy to the output port when being in a flyback working state, thereby effectively reducing the ripple voltage of the output end.
H02M 3/335 - Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
32.
LLC RESONANT CONVERTER, AND WIDE GAIN CONTROL METHOD
Disclosed are a wide gain control method for an LLC resonant converter. The method comprises: dividing an input voltage range into two voltage sections, and using two control modes; in a low voltage section of the input voltage range, using a full-bridge LLC PFM control mode, and changing an output voltage gain by means of changing a switch frequency; and in a high voltage section of the input voltage range, using a full-bridge LLC variable duty cycle control mode, wherein in the range of the entire high voltage section, a switch frequency is equal to a resonant frequency fr, and changing an output voltage gain by means of changing a duty ratio of a primary-side switch transistor. Further disclosed is an LLC resonant converter using the control method. By means of the present invention, smooth switching between modes can be realized, the working efficiency, the gain range and the power density of a converter are improved, and the requirement of a wide-voltage gain range conversion occasion is met.
H02M 3/335 - Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
H02M 7/48 - Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
33.
MULTIMODE SOFT SWITCHING CONVERTER AND CONTROL METHOD THEREOF
Disclosed are a multimode soft switching converter and a control method thereof. The switching converter comprises a synchronous rectifying circuit and a controller. The controller enables the synchronous rectifying circuit to work in a frequency conversion mode, a quasi-resonant frequency limiting mode, and a frequency reduction mode according to the size of the load and the switching frequency, and determines, according to the relation between an input voltage and an output voltage, whether the frequency conversion mode and the quasi-resonant frequency limiting mode mainly comprise the reverse phase. Finally, the effect that the synchronous rectifying circuit realizes soft switching within the full-load range and the full-input voltage range is achieved, thereby improving the working frequency of the switching converter, the power density, and the efficiency, reducing the volume, and reducing the EMI and costs.
H02M 3/158 - Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
34.
SELF-EXCITED PUSH-PULL CIRCUIT AND AUXILIARY POWER SUPPLY METHOD THEREFOR
Proposed is a self-excited push-pull circuit, comprising a main power circuit and an auxiliary power supply circuit, the main power circuit comprising a triode TR1, a triode TR2, and a transformer T1, an output end of the auxiliary power supply circuit being electrically connected to a central tap of an auxiliary winding of the transformer T1, so as to supply base currents to the triodes TR1 and TR2, the present invention is characterized in that an input end of the auxiliary power supply circuit is electrically connected to a collector of the triode TR1 and/or the triode TR2, so that the short-circuit power consumption of a product can be reduced while enhancing the loading capacity of the product. Compared with the prior art, the circuit of the present invention has the characteristics of small loss, a higher output voltage than an input voltage of a product, and taking into account both the loading capacity and the short-circuit power consumption of a product, and is particularly suitable for use in a low-voltage input state, and, in a wide input voltage range and a wide temperature range, can satisfy the loading capacity of a product and reduce the short-circuit power consumption in a short-circuit state of an output end of the product.
H02M 3/338 - Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only in a self-oscillating arrangement
35.
CURRENT DETECTION CIRCUIT, CONVERTER, AND CURRENT DETECTION METHOD FOR CONVERTER
A current detection circuit, comprising a shunt resistor Rcr, a shunt capacitor Ccr, a switching diode Dcr, a voltage source Vc, a resistor Rv and a detection switch Q5. The current detection circuit can be applied to the current detection of a device which is composed of an inverter circuit, a resonant circuit, a transformer and a rectifier network and is similar to a floating-ground type device in an LLC resonant converter; and according to an operating state of the LLC resonant converter, when common grounding occurs in a terminal voltage of a resonant capacitor Cr, the detection switch Q5 is switched off, and a resonant cavity current can be reflected by means of sampling a terminal voltage Vcr of the shunt resistor Rcr.
G01R 19/00 - Arrangements for measuring currents or voltages or for indicating presence or sign thereof
H02M 3/28 - Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC
H02M 3/335 - Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
36.
HEXAHEDRAL SHIELDING DEVICE, ELECTRONIC MODULE APPLYING HEXAHEDRAL SHIELDING DEVICE, AND MANUFACTURING METHOD FOR ELECTRONIC MODULE
A hexahedral shielding device, comprising a box-like shielding body (10), a sheet-like shielding bottom cover (20), a first connecting terminal (30), a second connecting terminal (40), and a PCB (50). The second connecting terminal (40) is provided with a first supporting protruding portion (401) and a second supporting protruding portion (402), so that the second connecting terminal (40) can be conveniently connected to a first metallized through hole (204) and a second metallized through hole (503) in an automatic welding manner. In addition, the sheet-like shielding bottom cover (20) is further provided with an empty slot (205), and a welding portion (303) of the first connecting terminal (30) is embedded into the empty slot (205), so that the welding portion (303) of the first connecting terminal (30) can be conveniently connected to a first pad (208), a second pad (209), and a side wall copper foil (206) in an automatic welding manner, and finally, the box-like shielding body (10), the sheet-like shielding bottom cover (20), and a reference ground of the PCB (50) are connected together. Compared with the prior art, automatic welding operation can be implemented in a whole process, the welding quality is high, the operation efficiency is high, the machining cost is low, and large-scale batch production is facilitated.
H05K 9/00 - Screening of apparatus or components against electric or magnetic fields
H05K 3/34 - Assembling printed circuits with electric components, e.g. with resistor electrically connecting electric components or wires to printed circuits by soldering
Provided in the present invention is a high-voltage output converter. The high-voltage output converter uses a positive flyback circuit, and includes a positive input end, a negative input end, a transformer TX1, an MOS transistor Q1, an MOS transistor Q2, a diode D1, a diode D2, a diode D3, a capacitor C1, a capacitor C2, a capacitor C3, a capacitor C4, a positive output end and a negative output end, wherein the connection relationships therebetween are that the positive input end, a dotted end of a primary-side winding of the transformer TX1, a drain electrode of the MOS transistor Q1 and the negative input end are sequentially connected; the capacitor C2 and the MOS transistor Q2 are connected in series and are then connected in parallel at two ends of the primary-side winding; a non-dotted end of a secondary-side winding of the transformer TX1, the diodes D1, D3 and the positive output end are connected in series, the negative output end, the diode D2 and a dotted end of the secondary-side winding of the transformer TX1 are sequentially connected in series, the capacitor C1 is connected in parallel between a cathode of the diode D1 and the dotted end of the secondary-side winding of the transformer TX1, the capacitor C2 is connected in parallel between the non-dotted end of the secondary-side winding of the transformer TX1 and an anode of the diode D2, and the capacitor C3 is connected in parallel between the positive output end and the negative output end. The present invention realizes high-voltage output, and ensures that main power realizes ZVS within a full-load range.
H02M 3/335 - Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
39.
FORWARD-FLYBACK SWITCHING POWER SUPPLY CIRCUIT AND CONTROL METHOD THEREFOR
Disclosed in the present application are a forward-flyback switching power supply circuit and a control method therefor, applied to a boosting occasion in which an output voltage is far higher than an input voltage, wherein the output voltage can be adjusted. An MOS transistor in the present invention serves as a control switch and implements the following operation under the control of a control circuit: when an output of the forward-flyback switching power supply circuit is short-circuited or the output voltage is relatively low, the MOS transistor is disconnected, so that the whole circuit works in a flyback state, and short circuit power consumption and output efficiency are greatly reduced; when the output voltage of the forward-flyback switching power supply circuit is relatively high, the MOS transistor is conducted, so that the whole circuit works in a forward-flyback state, the voltage stress of a power tube of the whole circuit is reduced, device type selection is facilitated, and the efficiency of the whole machine is further improved.
H02M 3/335 - Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
H02M 1/32 - Means for protecting converters other than by automatic disconnection
H02M 1/36 - Means for starting or stopping converters
A forward and flyback switch power supply circuit comprises a primary side circuit, a transformer T1, and a secondary side circuit. The secondary side circuit comprises a diode D1, a diode D2, a diode D3, a capacitor C1, a capacitor C2, and a capacitor C3; terminal 4 of the transformer T1 is electrically connected to one end of the capacitor C2 and the anode of the diode D1; the other end of the capacitor C2 is electrically connected to the anode of the diode D2 and the other end of the capacitor C3; the cathode of the diode D2 is electrically connected to terminal 3 of the transformer T1 and the other end of the capacitor C1; the cathode of the diode D1 is electrically connected to one end of the capacitor C1 and the anode of the diode D3; and the cathode of the diode D3 is electrically connected to one end of the capacitor C3. The circuit is characterized in that the secondary side circuit further comprises an inductor L2, one end of the inductor L2 is connected to terminal 3 of the transformer T1, and the other end of the inductor L2 is connected to the other end of the capacitor C1. The inductor in the present invention serves as a transient current suppressor, which can, when an output is short circuited or an output voltage is relatively low, effectively lower the peak current and short-circuit power consumption on the secondary side of a transformer and improve the output efficiency.
H02M 3/335 - Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
A forward-flyback switching power supply circuit, applied to a boosting occasion in which an output voltage is far higher than an input voltage, wherein the output voltage can be adjusted. A controllable switching device serves as a control switch; when output short circuit occurs or an output voltage is low, the controllable switching device is controlled to be switched off, so that the whole circuit works in a flyback state, and short circuit power consumption and output efficiency are greatly reduced; when the output voltage is high, the controllable switching device is switched on, so that the whole circuit works in a forward-flyback state, the voltage stress of a power tube of the whole circuit is reduced, device type selection is facilitated, and the efficiency of the whole machine is further improved.
H02M 3/335 - Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
H02M 1/32 - Means for protecting converters other than by automatic disconnection
H02M 1/36 - Means for starting or stopping converters
42.
WIDE GAIN CONTROL METHOD FOR VARIABLE TOPOLOGY LLC RESONANT CONVERTER
Disclosed is a wide gain control method for a variable topology LLC resonant converter, the method being applied to a variable topology LLC resonant converter composed of an inverter circuit, an LLC resonant cavity, a transformer and a secondary rectifying and filtering output circuit. In the present invention, the range of an input voltage is divided into a low voltage section, a medium voltage section and a high voltage section respectively corresponding to three different modals; the variable topology LLC resonant converter uses variable-frequency PFM control of an FBLLC structure in the low voltage section of the input voltage, and an output voltage gain is changed by means of changing a switch frequency; the variable topology LLC resonant converter uses fixed-frequency PWM control of the FBLLC structure in the medium voltage section of the input voltage, and the output voltage gain is changed by means of changing a duty ratio of a switch tube (S1) of the inverter circuit; and the variable topology LLC resonant converter uses fixed-frequency PWM control of an HBLLC structure in the high voltage section of the input voltage, and the output voltage gain is changed by means of changing the duty ratio of the switch tube (S1) of the inverter circuit.
H02M 3/335 - Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
43.
SELF-ADAPTIVE ZVS CIRCUIT AND CONTROL METHOD THEREFOR
Disclosed are a self-adaptive ZVS circuit and a control method therefor. The self-adaptive ZVS circuit comprises a power supply V1, a power supply V2, a power supply V3, a switch tube Q1, a switch tube Q2, an inductor L and a double-comparison unit, wherein a drain electrode of the switch tube Q1 and one input end of the double-comparison unit are connected to the power supply V1; a source electrode of the switch tube Q1, a drain electrode of the switch tube Q2 and the other input end of the double-comparison unit are connected to one end of the inductor L1; a source electrode of the switch tube Q2 is connected to the power supply V2; and the other end of the inductor L1 is connected to the power supply V3. In the present invention, a generalized ZVS definition is utilized; and by means of the double-comparison unit, whether a switch tube realizes ZVS can be simply and quickly determined, and a control circuit is informed of whether adjustment is performed in the next period and how to adjust a circuit time sequence in order to realize self-adaptive ZVS of the switch tube. Due to the fact that a comparison speed is far greater than the speed of a sampling and holding circuit, the advantages are even more apparent during high-frequency application.
H02M 1/08 - Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
H02M 1/088 - Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
44.
MULTI-MODE CONTROL METHOD FOR ACTIVE CLAMP FLYBACK CONVERTER
Provided in the present invention is a multi-mode control method for an active clamp flyback converter. In the flyback converter, a controller implements mode switching between a trailing edge non-complementary mode, a leading edge non-complementary mode, and a leading edge non-complementary Burst mode of two drive signals after comparing a detection feedback voltage to a set mode switching threshold voltage. The present invention uses the trailing edge non-complementary mode to reduce the circulating current of the converter, and uses the leading edge non-complementary mode to replace a common flyback mode, thus enhancing the light-load efficiency. The leading edge non-complementary Burst mode is used when there is no load, thereby limiting the magnitude of primary edge peak current during the Burst mode, preventing the generation of audio noises, and no-load power consumption is low.
H02M 3/335 - Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
Disclosed is a control method for an active clamp flyback converter. In the flyback converter, a main switch tube controls the current of a primary winding of the flyback converter, a clamping switch tube clamps a node voltage of a primary side of the flyback converter, and a controller generates control signals for controlling the main switch tube and the clamping switch tube by detecting a feedback voltage; when the converter works under a light load, and when the main switch tube is turned off, the clamping switch tube is immediately turned on after a period of fixed deadtime, the converter charges a clamping capacitor by means of the clamping switch tube to recover leakage inductance energy, wherein a turn-on time period of the clamping switch tube is shorter than a resonance period of the leakage inductance and output junction capacitance of the main switch tube and the clamping switch tube. In the present invention, a large resistor does not need to be connected to the clamping capacitor in parallel, and the light load efficiency is improved.
H02M 3/335 - Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
The present invention discloses an LLC resonant converter and a control method, wherein the LLC resonant converter is low in design difficulty and comprises an inverter circuit, an LLC resonant cavity, a transformer and a rectifying network which are sequentially connected from input to output; the LLC resonant cavity comprises a resonant inductor Lr, an excitation inductor Lm and a resonant capacitor Cr, and is further added with a bidirectional switch; the resonant inductor Lr and the resonant capacitor Cr are connected in series between a first output end of the inverter circuit and a first end of a primary coil of the transformer, a second output end of the inverter circuit is connected with a second end of the primary coil of the transformer, the excitation inductor Lm is connected with the primary coil of the transformer in parallel, a first end of the bidirectional switch is connected with the first end of the primary coil of the transformer by being connected between the resonant inductor Lr and the resonant capacitor Cr, and a second end of the bidirectional switch is connected with the second end of the primary coil of the transformer; the resonant inductor Lr is connected between the first end of the bidirectional switch and the first end of the primary coil of the transformer, and the resonant capacitor Cr is connected between the first end of the bidirectional switch and the first output end of the inverter circuit.
H02M 3/335 - Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
H02M 7/5387 - Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
H02M 7/5395 - Conversion of DC power input into AC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters with automatic control of output wave form or frequency by pulse-width modulation
Disclosed are a switch converter and a control method therefor, the switch converter comprising an input positive power supply, an output positive voltage, a power supply common ground, a switching transistor Q1, a switching transistor Q2, a switching transistor Q3, a diode D1, an inductor L1 and a capacitor C1. A drain of the switching transistor Q1 is connected to the input positive power supply; a source of the switching transistor Q1 and a drain of the switching transistor Q2 are connected to one end of the inductor L1; a source of the switching transistor Q3 and a cathode of the diode D1 are connected to the other end of the inductor L1; a drain of the switching transistor Q3 is connected to one end of the capacitor C1; and a source of the switching transistor Q2, an anode of the diode D1 and the other end of the capacitor C1 are connected to the power supply common ground. The present invention solves the problem of a step-down circuit having a low comprehensive efficiency bias when working under a wide range of input voltages and loads, and simultaneously eliminates oscillation so as to improve EMI.
H02M 3/158 - Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
48.
CURRENT SAMPLING CIRCUIT, CURRENT ZERO-CROSSING DETECTION CIRCUIT, AND TOTEM-POLE BRIDGELESS PFC CIRCUIT AND CONTROL METHOD THEREFOR
Disclosed are a current sampling circuit (11), a current zero-crossing detection circuit, and a totem-pole bridgeless PFC circuit and a control method therefor. A switch control link is connected in series to a secondary side of a current transformer (CT1), so that normal current sampling is carried out when a forward current flows through the secondary side, and a low-resistance or low-voltage path is provided through a sampling switch (S1) when a negative current flows through the secondary side, thereby solving the problem of high voltage stress of the secondary side of the current transformer (CT1). Moreover, due to the existence of the low-resistance path or the low-voltage path, reverse excitation of the transformer (CT1) is small, and a reverse excitation current also has a demagnetization path, such that the accumulation of the reverse excitation current is small, so that the transformer (CT1) cannot be saturated, and a false trigger voltage signal cannot be generated.
A ripple current generation circuit, for use in reducing the loss of a charging switch while achieving discharge energy recovery of an electrolytic capacitor and the low frequency pulsating current charging, and making it possible for the average aging voltage of the electrolytic capacitor to follow the input voltage without being affected by the discharge current. The ripple current generation circuit comprises an input voltage, a switch circuit, an inductor, and a capacitor. The switch circuit, the inductor, and the capacitor are connected in series to form a series circuit. Both ends of the series circuit are connected to both ends of an input power supply Vin. A resonant cycle of the inductor and the capacitor is between four-thirds and four times the turn-on time of the switch circuit. When the power supply Vin charges the capacitor, it is unnecessary to provide a voltage higher than the voltage required for the aging of the capacitor, so that it is possible to charge without the switching loss.
G05F 1/56 - Regulating voltage or current wherein the variable actually regulated by the final control device is DC using semiconductor devices in series with the load as final control devices
50.
ASYMMETRIC HALF-BRIDGE CONVERTER AND CONTROL METHOD THEREFOR
Disclosed are an asymmetric half-bridge converter and a control method therefor. By means of additionally providing a one-way clamping network connected in parallel with a primary side, a secondary side or a third winding of a transformer, when an excitation inductance current reaches a set value, an auxiliary switch is controlled to be switched off and the one-way clamping network is controlled to be conducted, such that a clamping current flows through the one-way clamping network, and the one-way clamping network performs clamping and keeps the camping current substantially unchanged; and within a period of time before a main switch is conducted, the one-way clamping network is controlled to be switched off in order to release the clamping current, such that the voltages at two ends of the main switch are reduced to zero or close to zero, thereby realizing zero-voltage conduction of the main switch. The present invention can realize effective control over a negative peak of an excitation inductance current, and reduces a current effective value of a power device under a light/no load of a converter; moreover, where the advantages of zero-voltage conduction of an existing technical solution are retained, the present invention greatly improves the light-load efficiency of the converter, reduces the no-load loss, and is simply and efficiently controlled.
H02M 3/335 - Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
The present invention discloses a switch converter and a control method thereof, the switch converter comprises an input power positive, an output voltage negative, a power common ground, a switching transistor Q1, a switching transistor Q2, a switching transistor Q3, a switching transistor Q4, an inductor L1 and a capacitor C1; a drain of the switching transistor Q1 and a drain of the switching transistor Q3 are connected to the input power positive, a source of the switching transistor Q1 and a drain of the switching transistor Q2 are connected to one end of the inductor L1, a source of the switching transistor Q3 and a drain of the switching transistor Q4 are connected to the other end of the inductor L1, a source of the switching transistor Q4 is connected to one end of the capacitor C1, a source of the switching transistor Q2 and the other end of the capacitor C1 are connected to the power common ground. The present invention realizes that the polarity of the input and output voltages are reversed, all the switching transistors ZVS are turned on, and the efficiency is high; when the absolute value of the input-output voltage ratio is large, the inductor L1 can be quickly demagnetized, and the current waveform of the inductor L1 is changed from triangle to quadrilateral, realizing high-frequency and high-efficiency operation of the switch converter.
H02M 3/158 - Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
A switching converter and a control method therefor. The switching converter comprises input power supply positive Vin, output voltage positive Vo, power supply common ground GND, transistor Q1, transistor Q2, transistor Q3, transistor Q4, inductor L1, and capacitor C1. A drain electrode of transistor Q1 and a drain electrode of transistor Q3 are connected to input power supply positive Vin. A source electrode of transistor Q1 and a drain electrode of transistor Q2 are connected to one end of inductor L1. A source electrode of transistor Q3 and a drain electrode of transistor Q4 are connected to the other end of inductor L1. A source electrode of transistor Q4 is connected to one end of capacitor C1. A source electrode of transistor Q2 and the other end of capacitor C1 are connected to power supply common ground GND. The switching converter is capable of implementing the fast demagnetization of inductor L1 in a condition of an increased ratio of input-output voltages and altering the current waveform of inductor L1 from triangular to quadrilateral, thus implementing high-frequency, high-efficiency working of the switching converter.
H02M 3/158 - Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
53.
CURRENT CONTROL CIRCUIT AND CONTROL METHOD THEREFOR
A current control circuit. Current information of an output side of a bidirectional converter is obtained by a current sampling circuit, outputs of a first voltage regulation circuit and a second voltage regulation circuit are used as an input of an error amplifier, an output of the error amplifier is used as an input of an optical coupling feedback circuit, a current signal on the output side is fed back to a PWM circuit through conversion processing of circuits at all levels, and a control circuit controls duty ratio of input side switch tubes (Q1, Q2) in a main power circuit to implement constant current of the output side. The current control circuit can ensure that the bidirectional converter has no current oscillation and current spike when switching a working direction, and can also implement the constant current of the output side of the bidirectional converter when only one forward bandgap voltage reference source is used, and the circuit is simple.
H02M 3/335 - Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
54.
AC/DC POWER SUPPLY SYSTEM AND CONTROL METHOD THEREOF
An AC/DC power supply system, comprising an AC power supply, a power factor correction (PFC) circuit, a control circuit, bus capacitance, a switching circuit, a DC/DC isolation power stage and output capacitance and output load. Wherein the input of the PFC module is an AC power supply, the output thereof is a bus voltage, the input of the switching circuit is a bus voltage, the output thereof is four terminals, every two terminals as a group are respectively connected to the input ends of two DC/DC modules, and the output ends of the DC/DC modules are connected in parallel and supply power to the output capacitance and load. The control circuit sets the output voltage of the PFC module according to an effective value or a peak value of a detected input voltage, controls the operation of the PFC circuit according to detected signals Vbus_s and PFC sampling signals to realize the PFC function and stabilize the bus voltage Vbus, at the same time, controls the switching circuit to change the access mode of the DC/DC module according to the effective value or the peak value of the detected input voltage, or directly changes the operating mode of the subsequent-stage DC/DC through a control signal, so that the power supply system operates in the optimal operating state.
H02M 7/219 - Conversion of AC power input into DC power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a bridge configuration
H02M 1/42 - Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
H02M 3/335 - Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
Provided in the present invention is an improved flyback converter. Only one capacitor is added to a primary freewheeling circuit without using synchronous rectification, so that ZVS of a primary MOS tube can be realized in the case of constant frequency control. The added capacitor can absorb leakage inductance energy when a main power tube is turned off, thereby facilitating reducing a voltage peak of a main MOS tube. In the process of turning off the main MOS tube, a transformer releases energy to a secondary side, when a current of the secondary side is decreased to zero, energy of the transformer is completely released, and at this time, the added capacitor releases energy to reversely excite the transformer, so that the transformer generates a reverse excitation current, thereby providing the basis for realizing ZVS of a main MOSFET.
H02M 3/335 - Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
Disclosed is a five-level converter, comprising four switching tubes with drains and sources connected with each other in series. Driving signals of the switching tubes are all controlled by a unified clock. The switching tube S2 always starts to be switched on within a short period of time before the switching tube S1 is switched on, and starts to be switched off within a short period of time after the switching tube S1 is switched off. The switching tube S3 always starts to be switched on within a short period of time before the switching tube S4 is switched on, and starts to be switched off within a short period of time after the switching tube S4 is switched off. The converter reduces voltage stress between the drains and the sources of the various switching tubes by controlling the time sequence of the switching on and switching off of the various switching tubes, and can realize a uniform voltage without a pre-charging process, thus the advantages of a traditional five-level converter can be maintained; moreover, nonuniform voltage stress is not present in the switching tubes during a circuit starting process, and the voltage stress of the various switching tubes can be naturally balanced and reduced.
H02M 3/158 - Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
57.
POWER SUPPLY CIRCUIT AND PHOTOVOLTAIC POWER GENERATION SYSTEM COMPRISING SAME
A power supply circuit and a photovoltaic power generation system comprising same. The power supply circuit utilizes the condition that a voltage output by discharge of a capacitor is a direct-current voltage which decreases with time, a CCFL conversion circuit is connected behind the capacitor, the CCFL conversion circuit converts the input direct-current voltage which decreases with time into a sinusoidal alternating-current for output. Since the CCFL conversion circuit operates in an open-loop mode, a peak-to-peak value of the sinusoidal alternating-current output by the CCFL conversion circuit is in direct proportion to an operating voltage of the CCFL conversion circuit, the voltage decreases with time, that is, the peak-to-peak value of the sinusoidal alternating-current output by the CCFL conversion circuit decreases with time, thus, an effective value of the sinusoidal alternating-current decreases with time, and an attenuated sinusoidal alternating-current voltage is obtained. The attenuated sinusoidal alternating-current voltage acts on both ends of an activated photovoltaic string, so that a voltage waveform ΔU/Δt output by the power supply circuit is small, thus the service life of the photovoltaic string is prolonged, the radiation to the environment is small, and the power supply circuit is simple to implement and low in cost.
H02M 3/335 - Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
H02J 3/38 - Arrangements for parallelly feeding a single network by two or more generators, converters or transformers
58.
POWER SUPPLY CIRCUIT AND PHOTOVOLTAIC POWER GENERATION SYSTEM COMPRISING SAME
Disclosed in the present invention are a power supply circuit and a photovoltaic power generation system comprising same. The power supply circuit is a two-stage topological power supply circuit; the first stage is a BUCK circuit, and processes an input high-voltage direct current into a direct current voltage of which output voltage drops with time; the second stage is a CCFL conversion circuit; because the CCFL conversion circuit works in an open loop mode, a peak-to-peak value of a sinusoidal alternating current output thereby is proportional to a working voltage of the CCFL conversion circuit, which drops with time, i.e., the peak-to-peak value of the sinusoidal alternating current output by the CCFL conversion circuit also drops with time, and thus an effective value of the sinusoidal alternating current also drops with time, thereby obtaining an attenuated sinusoidal alternating current voltage. The power circuit acts on two ends of an activated photovoltaic group string, so that a voltage waveform ∆U/∆t output by the power circuit is small, and thus the service life of the photovoltaic group string is prolonged and radiation to the environment is small; moreover, the power supply circuit of the present invention is simple to implement and low in costs.
H02M 3/155 - Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
SSSDDDD as a constant may enable the contactor coil current to not change in a wide input range, so that when a PF value of a contactor power saver is increased, a bus capacitor and a sampling resistor therein may be removed, and the average value of the contactor coil current does not change within a wide voltage alternating current/direct current input voltage range.
Disclosed is a full-bridge synchronous rectification controller, in which a full-bridge synchronous rectification circuit formed by two self-driven PMOS synchronous rectifiers and two externally-driven NMOD synchronous rectifiers, and a control circuit thereof are integrated. The two self-driven synchronous rectifiers select to be turned on by transformer windings on their own, without requiring a driving circuit. The two externally-driven synchronous rectifiers generate a spike voltage at the drain after being turned on, and a synchronous rectification logic module 1 and a synchronous rectification logic module 2 may generate signals for turning off the externally-driven synchronous rectifiers after detecting the spike voltage, so a signal for turning off the externally-driven synchronous rectifiers is blocked by means of a minimum turn-on time signal, preventing the externally-driven synchronous rectifiers from being turned off immediately after being turned on. The present invention can realize that only one full-bridge synchronous rectification controller is required for a secondary side of a separately excited push-pull converter, improving the output efficiency, saving one secondary winding, improving the production efficiency, and reducing machining costs and power supply system costs.
H02M 3/335 - Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
61.
SELF DRIVE CIRCUIT FOR TWO-TRANSISTOR FORWARD SYNCHRONOUS RECTIFIER CIRCUIT
Disclosed is a self drive circuit for a two-transistor forward synchronous rectifier circuit. The two-transistor forward synchronous rectifier circuit comprises a transformer, a two-transistor forward network at the primary side of the transformer, and a synchronous rectifier conversion network at the secondary side of the transformer. The transformer comprises a first primary winding, a first secondary winding, and a second secondary winding. The self drive circuit for the two-transistor forward synchronous rectifier circuit drives a freewheeling transistor in the synchronous rectifier conversion network. A rectifier transistor in the synchronous rectifier conversion network is driven by controlling an operation state of a first P-type MOS transistor in the self-drive circuit. When a synchronous rectifier transistor and a synchronous freewheeling transistor at the secondary side of the transformer are turned on at the same time, the freewheeling transistor is capable of obtaining a drive voltage and providing a conduction path to an output inductor at a next stage, thereby improving the efficiency of a converter, realizing adjustability of the drive voltage of the freewheeling transistor, and achieving flexible and reliable control.
H02M 1/088 - Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
62.
SELF-EXCITED PUSH-PULL CONVERTER CIRCUIT, POWER SUPPLY MODULE, AND POWER SUPPLY SYSTEM
Disclosed in the present invention are a self-excited push-pull converter circuit, a related power supply module, and a related power supply system. The self-excited push-pull converter circuit has its start capacitor changed into two capacitors connected in series and decreasing in capacitance as the terminal voltage increases; when one of the capacitors is short-circuited, the other capacitor would decrease in capacitance because of the increase in working voltage, and thus, the capacitance actually provided by the other capacitor is not significantly different from the capacitance provided when the two capacitors connected in series are normal. The present invention can cause the failure rate caused by the start capacitor to be the square of the original failure rate, can easily solve the technical problem of high product failure rate due to capacitor failure in combination with an input filter capacitor and an output filter capacitor which are placed externally, and can also reduce product models and increase the universality in use for customers by further placing an output rectifier circuit externally.
H02M 3/337 - Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only in push-pull configuration
H02M 3/338 - Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only in a self-oscillating arrangement
Disclosed is a resonant driving circuit. By means of using a transformer to convert an input capacitance of a power tube to a primary side to participate in the oscillation of a voltage-controlled oscillator, a driving circuit works in a resonant state; moreover, a capacitance value of a variable capacitor is adjusted by means of an external control signal so as to realize an adjustable resonant frequency, and a bias voltage is applied on a secondary winding of the transformer, so that an intersection of driving voltages having a difference of 180° can be flexibly set according to requirements, thereby greatly reducing the influence of a power tube parameter on the performance of a switch converter. The present invention can make a driving circuit work in a resonant state and have minimum loss, and also can flexibly set a bias voltage so as to minimize the influence of the driving circuit on the performance of a switch converter. The circuit is simple, easy to realize, and has a stronger application value.
H02M 1/08 - Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
H02M 3/335 - Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
Disclosed is a buck-boost circuit. The circuit is an improvement based on a conventional four-transistor buck-boost circuit, and is obtained by eliminating a switch device S3 therein, reusing a switch device S2 in a boost mode so as to eliminate one switch transistor, and connecting an inductor in series between a source of a switch device S1 and a drain of the switch device S2, such that the circuit has different turn ratios in different modes. When the circuit is in a buck mode, under a condition of a ratio of an input voltage to an output voltage being the same, a duty cycle of the switch device S1 for a turn ratio greater than 1 is greater than that for a turn ratio equal to 1, and when the circuit is in the boost mode, a duty cycle of the switch device S2 for a turn ratio greater than 1 is less than that for a turn ratio equal to 1. The invention is configured such that the circuit is applicable to power supply applications where an input voltage is less than, equal to, or greater than an output voltage, and also for power supply applications having a large transformation ratio between an output and an input.
H02M 3/158 - Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
The present invention provides a zero-voltage power factor correction (PFC) converter, comprising a main power unit 101, an output voltage detection unit 102, an error amplification unit 103, a logic control unit 104, a drive unit 105, and a negative current detection unit 106; a first output terminal SW1 of the drive unit 105 is connected to a gate of a main switch tube in the main power unit, and controls the opening and closing of said main switch tube; a second output terminal SW2 of the drive unit 105 is connected to a gate of a synchronous rectifier tube in the main power unit, and controls the turning on and off of said synchronous rectifier tube; the negative current detection unit 106, upon detecting that the negative current of the inductor reaches a set current threshold, turns off the synchronous rectifier tube. Under different instantaneous input voltage conditions of alternating-current input, the main switch tube is turned on for a fixed time to perform a PFC function. In the present invention, under high-voltage input conditions, it is still possible to achieve zero voltage turn-on and PFC functionality, which is conducive to improving the efficiency of a product under high-voltage input and also is more conducive to making the product more high-frequency and miniaturized.
H02M 3/158 - Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
H02M 1/42 - Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
66.
FLOATING-GROUND VOLTAGE STABILIZATION POWER SUPPLY CIRCUIT
A floating-ground voltage stabilization power supply circuit, wherein same is applied between two boost pins of a four-switch Buck-Boost converter, and same can solve the problem of no power supply for a tube driving circuit in a Buck mode and a Boost mode of the four-switch Buck-Boost converter. In the present invention, an output voltage is higher than an input voltage in the Boost mode, and as such, a bootstrap voltage of a Boost circuit can easily charge a bootstrap capacitor of a Buck circuit through the floating-ground voltage stabilization power supply circuit; and when in the Buck mode, a bootstrap voltage of the Buck circuit can easily charge a bootstrap capacitor of the Boost circuit through the floating-ground voltage stabilization power supply circuit, thereby realizing the function of continuously turning on and supplying power to a switch tube in the converter. The present invention is low in cost, has a simple circuit, has a low amount of loss, is easy to realize and can easily be used for IC integration, and also avoids all the disadvantages brought about by traditional solutions.
H02M 3/158 - Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
Provided in the present invention is a controller IC integrated with a power tube M1 and having a boost function, wherein the controller IC comprises a boost starting and turn-off point selection module; and the boost starting and turn-off point selection module can enable the controller IC to have a boost function when a BOS end is connected to an external device. When the BOS end is grounded, the controller IC does not have a boost function. According to the present invention, wide-range input requirements are realized merely by means of one controller IC and merely by using inductors and diodes at the periphery of the boost topology, the peripheral circuit is simplified, the PCB layout area and size are reduced, and the cost is reduced, meeting the requirements of a high-density, small-sized and low-cost power supply system.
H02M 3/335 - Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
68.
IMPROVED ZERO RIPPLE OUTPUTTING CONVERTER AND CONTROL METHOD THEREFOR
344) in the auxiliary voltage circuit achieves zero ripple outputting in a full input voltage range. By means of the converter, when the input voltage range of a power level is relatively wide, the auxiliary voltage of the required external winding does not change with the input voltage of the power level, and zero ripple outputting can be realized within the full input voltage range.
H02M 1/15 - Arrangements for reducing ripples from DC input or output using active elements
H02M 3/335 - Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
69.
SHORT-CIRCUIT PROTECTION DETECTION CIRCUIT AND DETECTION METHOD
A short-circuit protection detection circuit (101), comprising a starting circuit (11) and a comparator (15), and further comprising a positive temperature coefficient current generation circuit (12) and a short-circuit protection threshold generation circuit (13). The positive temperature coefficient current generation circuit (12) respectively applies, to the two bipolar transistors having different current densities, two currents of the same magnitude generated by mirroring, so as to generate a difference between the base-emitter voltages of two bipolar transistors, the difference between the voltages is proportional to the absolute temperature, and then is converted, by means of a resistor, to a positive temperature coefficient current for short-circuit protection threshold compensation; the short-circuit protection threshold generation circuit (13) is configured to apply, to two resistors composed by different numbers of unit resistors, two positive temperature coefficient currents generated by mirroring, and design the ratio of the two positive temperature coefficient currents and the ratio of the numbers of unit resistors of the two resistors, so as to perform matching to generate a short-circuit protection threshold voltage matching the detection voltage temperature coefficient of the drain of a switch transistor NM1.
G01R 31/00 - Arrangements for testing electric propertiesArrangements for locating electric faultsArrangements for electrical testing characterised by what is being tested not provided for elsewhere
H02M 3/00 - Conversion of DC power input into DC power output
G05F 3/30 - Regulators using the difference between the base-emitter voltages of two bipolar transistors operating at different current densities
Disclosed by the present invention is a multilevel step-down circuit, comprising an input unit circuit, a drive unit circuit, and an output unit circuit; the input unit circuit comprises a transformer T1, n capacitors, n N-MOS transistors, and an output capacitor Co, the transformer T1 comprising n primary coils and secondary coils, wherein n is a natural number greater than or equal to 2; an n-stage capacitor and n-stage primary coil configured in the present invention achieve n+1 level voltage division, which may lower reverse voltage stress of drains and sources of the N-MOS transistors as well as of diodes in high voltage application scenarios. At the same time, the circuit according to the present invention does not require the addition of a sampling circuit unit and a voltage equalization circuit unit. When device parameters are different or the connection times of the N-MOS transistors are not equal, voltage equalization may still be achieved for device voltage stress, which simplifies circuit design and is beneficial to circuit device selection.
H02M 3/335 - Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
A coil control circuit of a contactor, comprising a freewheeling control circuit and a coil driving circuit. The coil driving circuit comprises an MOS transistor T1 and a PWM generator U3 for driving the MOS transistor T1. The drain of the MOS transistor T1 is connected to a contactor coil, and the source of the MOS transistor T1 is grounded to control electric connection and disconnection between the contactor coil and a contactor power supply. The freewheeling control circuit consists of a bidirectional switching device K1, an MOS transistor T2, and a freewheeling transistor driving circuit. A synchronous control signal of the freewheeling transistor driving circuit is provided by the coil driving circuit. In suction and holding phases of the contactor, the on-off state of the bidirectional switching device K1 of the freewheeling control circuit is complementary to that of the MOS transistor T1 of the coil driving circuit, that is, when the MOS transistor T1 is turned on, the bidirectional switching device K1 is turned off, and in this case, the contactor coil stores energy; when the MOS transistor T1 is turned off, the bidirectional switching device K1 is turned on, and the bidirectional switching device K1 provides a low-impedance freewheeling path for the contactor coil. The coil control circuit of the contactor reduces the loss of the contact coil in the holding phase while enabling the contactor to be quickly turned off.
FA1FA2refref is less than the voltage change value at the voltage division sampling point when the output voltage is high, such that the power system operates stably, while at the same time, the feedback switch state detection module needs only to use low-voltage components, reducing the cost of the power supply system.
H02M 3/335 - Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
73.
CURRENT SOURCE CIRCUIT AND IMPLEMENTATION METHOD THEREFOR
A current source circuit and an implementation method therefor, which can generate a current with an arbitrary temperature coefficient, and can also generate a current having two temperature coefficients in a full temperature range, meeting the temperature property requirement of a post-stage circuit for a bias current. The current source circuit comprises: a first current generating circuit (10) for generating a positive temperature coefficient current or a zero temperature coefficient current; and a second current generating circuit (11) for generating a zero temperature coefficient current or a positive temperature coefficient current. The result of the subtraction between the two temperature coefficient currents is obtained, subjected to proportional adjustment, and then added to the zero temperature coefficient current, so as to generate the final desired output current.
The present invention provides a switching converter that employs an active clamping circuit. A combined inductive circuit is introduced, and one inductor is used to bear most of input voltage, and the other inductor is used to output delivered energy. A control circuit is used to control the turn-on and turn-off of two power tubes in the active clamp circuit to implement the function of adjusting an output voltage, which can satisfy the requirement of high step-down ratio and avoid excessively small and too-narrow duty cycle, and greatly improves the performance of the circuit.
H02M 3/158 - Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
H02M 1/08 - Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
A DC-DC converter, comprising a first side, a second side, a converter B, power transistors Q1, Q2, Q3 and Q4, and capacitors C1 and C2, wherein the converter B at least comprises a first winding Np and a second winding Ns; the connection relationship at the first side comprises Q1 being in series connection with Np, and Q3 being in series connection with C1 and then being in parallel connection with Np; the second side and the first side are symmetrical; Vgs1, Vgs2, Vgs3 and Vgs4 are drive signals that are sequentially applied between gate electrodes and source electrodes of Q1, Q2, Q3 and Q4; a drive timing sequence used by power transistors Q1 to Q4 overcomes the problem of a high switch-off voltage spike existing due to the resonance of the voltage leakage inductance of Q1 and Q2 with the combined capacitors thereof; and by means of limiting the conduction time of Q3 and Q4, the power loss generated by the resonance of C1 and C2 is reduced when Q1 and Q2 are switched off. The present invention has the advantages of simple circuitry and high conversion power.
H02M 3/335 - Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
A converter and a control method thereof. An absorption network is additionally arranged on the basis of a conventional flyback converter; voltages at two ends of a secondary rectifier diode are clamped to Vin/N+Vo when a main switch tube is turned on, wherein: N is the turn ratio between a primary side and a secondary side of a transformer; Vin is an input voltage; and Vo is an output voltage; therefore, the turn-off loss of the secondary rectifier diode is reduced, and the energy in the absorption network can be utilized again and the conversion efficiency of the flyback converter is thus improved.
H02M 3/335 - Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
A zero-output ripple converter; the magnetic core shape of a transformer is changed in that a magnetic column is added on the basis of an original converter structure, and a three-magnetic column magnetic core is changed into a four-magnetic column magnetic core. Then, a winding is added onto the added magnetic column, and a suitable voltage is added in the winding, such that magnetic flux generated by the added voltage offsets the influence that original magnetic flux has on output current ripples, and zero-output ripples is thus achieved. The present converter overcomes the defects of existing switch converters, and when an input voltage range is relatively wide, zero-output ripples may be achieved within the full input voltage range.
H02M 3/335 - Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
78.
ZERO VOLTAGE SWITCHING BOOST CIRCUIT AND CONTROL METHOD THEREFOR
A zero voltage switching synchronous rectifying Boost circuit, a zero voltage switching Boost circuit (30), and a control method therefor; an auxiliary resonant circuit (40) is connected in series in a rectifying circuit of a main power circuit; once a main power switching tube (32) is turned off, the current of a Boost inductor (31) is used to achieve the zero-voltage conduction of an auxiliary switching tube (42); then, the resonance between a resonant capacitor (44) and a resonant inductor (41) is used to rapidly increase the current of the resonant inductor (41) and cause the current of the resonant inductor (41) to be greater than the current of the Boost inductor (31); and the flyback of the current of the resonant inductor (41) by a diode (43) connected in parallel with the resonant capacitor (44) is used to ensure that the voltage of the resonant capacitor (44) will not be reversed and that the current of the resonant inductor (41) will not rapidly decrease after reaching the maximum value. When the auxiliary switching tube (42) is turned off, the difference value between the resonant current and the current of the Boost inductor (31) is used to achieve the zero-voltage conduction of the main power switching tube (32).
H02M 3/158 - Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
H02M 1/088 - Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters for the simultaneous control of series or parallel connected semiconductor devices
79.
TIME WIDTH DETECTION CIRCUIT AND CONTROL METHOD THEREFOR
A time width detection circuit and a control method therefor. By means of sampling a signal satisfying timing logic and according to the time width thereof, a corresponding output signal is output. The circuit can be used in switched-mode power supplies and is used in conjunction with a drive regulation circuit that processes drive waveforms to control the drive signal input by a drive circuit. When an input signal Vin is a timing logic signal and the time it remains so does not surpass a set time, the voltage of the charging end of a capacitor C1 will be less than a determination value, and the output end of an output circuit will be suspended, thus not affecting the normal function of the drive regulation circuit. When the input signal Vin is a timing logic signal and the charging time exceeds the set time, the voltage of the charging end of the capacitor C1 will be higher than the determination value, and the output circuit will output a low level signal, shutting off the output signal from the drive regulation circuit. The determination value of the voltage of the charging end of the capacitor C1 is adjustable, and the set time is also adjustable. The present circuit experiences little loss, is low cost, and does not burden normal circuit design.
H02M 3/158 - Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
A low-cost input anti-overvoltage protection circuit capable of monitoring the magnitude of an AC input voltage in real time and controlling on/off of a switch device in a chopper circuit by means of a control circuit. When the AC input voltage is increased abnormally, the control circuit can quickly detect and control the switch device in the chopper circuit to be in the on/off state, maintain the energy-storage capacitor voltage, so as to quickly and effectively protect a back-stage circuit, prevent an energy-storage capacitor and a switch tube of the back-stage circuit from being damaged due to high voltage, and the back-stage circuit can continue working normally. Compared with the prior art, the low-cost input anti-overvoltage protection circuit is applicable to the situation and the condition that the abnormal overvoltage of the power network voltage may occur such as ground fault, the reaction speed is fast, the circuit is simple and reliable, the cost is low, the EMC performance is excellent, the design is flexible, and the protective threshold can be adjusted.
A starting circuit with an ultralow input voltage. A PNP triode (Q1) and a voltage limiting circuit control the output voltage range, and the output voltage is ensured to meet the post-stage ultra-wide input voltage range and is limited in the working voltage range of a post-stage booster circuit of the starting circuit of a power module. By means of sampling of the input voltage by a control circuit, post-stage power supply is not affected by the differential pressure of the starting circuit when the starting circuit works under low voltage. The output voltage can be controlled in a voltage range when the starting circuit works under high voltage, and the output voltage of the starting circuit in the working voltage interval is ensured to meet the working voltage range of the post-stage booster circuit. Moreover, the loss of the circuit in the working state is low.
Provided by the present invention is a startup circuit; a voltage limiting circuit consisting of a p-channel metal-oxide semiconductor (P-MOS) transistor circuit, a voltage stabilizing circuit or a voltage clamping circuit controls the output voltage range so as to ensure that the output voltage meets the latter-stage ultra-wide input voltage range and the operating voltage range of a latter-stage boost circuit of a power source module startup circuit. The input voltage is sampled by means of an adjustable driving circuit to ensure that the startup circuit does not affect latter-stage power supply due to a pressure difference thereof during low voltage operation. During high voltage operation, the output voltage may be controlled within a voltage range to ensure that the output voltage of the startup circuit within the operating voltage range meets the operating voltage range of the latter-stage boost circuit. Meanwhile, the loss of circuit operation state is extremely low.
A starting circuit with low conduction voltage drop. The input voltage (Vin) can be detected in real time; when it is detected that the input voltage (Vin) is lower than a set voltage value, an N-MOS transistor (TR1) is switched on, so that the difference between the output voltage (VDD) and the input voltage (Vin) of the starting circuit is extremely low, thereby ensuring that the starting voltage of a post boost circuit basically follows the input voltage (Vin); and when it is detected that the input voltage (Vin) is higher than the set voltage value, a voltage limiting circuit operates to limit the output voltage (VDD) of the starting circuit within an operating input voltage range of the post circuit.
A contactor energy saving test circuit. A rectifier bridge (DB1) and a main power circuit form a contactor energy saving circuit, and a rectifier circuit (DB2), a sampling circuit, and a threshold comparison circuit are further added thereto. The threshold comparison circuit has a first reference (VTH1) and a second reference (VTH2). When a peak voltage of an output end signal (VT) of the sampling circuit is greater than the first reference (VTH1), the main power circuit is controlled to operate, and a contactor is attracted; when a voltage of the output end signal (VT) of the sampling circuit is lower than the second reference (VTH2), the main power circuit is controlled to be turned off, and the contactor is released. When an input voltage is an alternating current voltage, the peak voltage of the output end signal (VT) of the sampling circuit is equal to a voltage of the output end signal (VT) of the sampling circuit when the input voltage is a direct current voltage, such that the same voltage point triggers the contactor to operate, and an attraction voltage point and a release voltage point of a wide input voltage contactor are consistent regardless of whether the input voltage is an alternating current or a direct current input voltage. In addition, the circuit is easy to use. The invention ensures compatibility between alternating current and direct current contactor energy saving products and reduces production and inventory pressure of a manufacturer.
G01R 31/04 - Testing connections, e.g. of plugs or non-disconnectable joints
G01R 31/00 - Arrangements for testing electric propertiesArrangements for locating electric faultsArrangements for electrical testing characterised by what is being tested not provided for elsewhere
H01H 47/02 - Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for modifying the operation of the relay
H01H 47/00 - Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current
85.
SWITCH CONTROL CIRCUIT AND CONTROL METHOD THEREFOR
A switch control circuit and a corresponding control method, wherein same are applicable to a BOOST circuit (1). The switch control circuit comprises: an input voltage detection circuit (2), an input voltage comparison and control circuit (3), and an output voltage detection circuit (4), the input voltage detection circuit (2) detecting an input voltage of a BOOST circuit (1) so as to output an input voltage signal; the input voltage comparison and control circuit (3) comparing the magnitudes of the input voltage signal and a reference voltage signal, and controlling whether the output voltage detection circuit (4) operates; and the output voltage detection circuit (4) executing a relevant indication, when the output voltage detection circuit operates, detecting an output voltage of the BOOST circuit (1), and outputting an output voltage signal to a feedback pin of a PWM controller of the BOOST circuit (1) so as to control whether the BOOST circuit (1) operates. A wide input voltage is preprocessed by means of a segmentation control method, thereby solving the problem that a high input voltage ratio and temperature rise are difficult to be simultaneously taken account of.
H02M 3/156 - Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators
86.
BATTERY SHORT-CIRCUIT PROTECTION CIRCUIT FOR CHARGING POWER SUPPLY
Disclosed in the present invention is a battery short-circuit protection circuit for a charging power supply. The battery short-circuit protection circuit comprises a current sampling circuit, a logical control circuit, and a switch control circuit. The logical control circuit receives a sampling current of the current sampling circuit and outputs a switch control signal to the switch control circuit. The current sampling circuit is formed by a resistor Rcs. One end of the resistor Rcs is separately connected to a negative end of a load and an input end of the logical control circuit, and the other end of the resistor Rcs is separately connected to an output negative end of the power supply and a negative electrode of the battery. The switch control circuit comprises an MOS transistor TR1 and a resistor R1, and a gate of the MOS transistor is connected to an output end of the logical control circuit; a drain of the MOS transistor TR1 is connected to a positive end of the load and an output positive end of the power supply, and a source of the MOS transistor TR1 is connected to an electric discharge end of the battery. Compared with the prior art, the battery short-circuit protection circuit in the present invention can effectively avoid false triggering of over-current protection caused by a filter capacitor when the battery is firstly connected, and has a fast response speed, high reliability, flexible design, and can adjust a protection current threshold, a hiccup time and response speed.
H02H 3/087 - Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition, with or without subsequent reconnection responsive to excess current for DC applications
H02J 7/00 - Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
Provided by the present invention is an auxiliary power supply circuit: using the voltage Vds between a drain and source when a primary metal-oxide-semiconductor (MOS) transistor of a transformer is turned off and after undergoing filter absorption and linear regulation so as to obtain a stable output voltage, and using the stable output voltage to supply power to a control integrated circuit (IC) so as to guarantee the power supply requirements during the normal operation of the control IC. The present invention has a simple circuit, has low implementation costs, and may effectively reduce the size of a transformer relative to the current widely used solution of an auxiliary winding supplying power, output voltage being stable, while the absorption function of a filter circuit on leakage inductance energy may reduce the stress on a MOS transistor to a certain extent; however, since certain loss occurs for a linear voltage stabilizing circuit, the present invention is more suitable when the difference between MOS transistor stress Vds and IC power supply voltage VDD is not great, at which time the auxiliary power supply circuit experiences little loss and may be used as a more practical auxiliary power supply solution.
An output soft-start circuit for a switching power supply, used for implementing slow establishment of a switching power supply output voltage. After a power supply is started, an output voltage is increased, a capacitor is charged, signals in the charging process are introduced into a voltage feedback loop in real time, and the duty cycle of a PWM control chip is limited, so as to enable the output voltage to be increased to a specified value in a capacitor charging index form. In a case where the feedback loop has a power supply mode such as an auxiliary power supply, the soft-start circuit can still work normally, and the circuit is simple, low in costs, and high in reliability.
Provided are a synchronous rectification control circuit and method. The synchronous rectification control circuit comprises an output detection unit (102), an error amplification unit (103), a logic control unit (104) and a driving circuit unit (105), wherein the output detection unit (102) is connected between a positive output end of a main power unit (101) and a first input end of the error amplification unit (103); an output end of the error amplification unit (103) is connected to a first input end of the logic control unit (104); a first output end and a second output end of the logic control unit (104) are respectively connected to a first input end and a second input end of the driving circuit unit (105); a first output end and a second output end of the driving circuit unit (105) are respectively connected to gates of switch tubes M1 and M2; and a third output end of the driving circuit unit (105) is respectively connected to a drain of the switch tube M1 and a source of the switch tube M2. The synchronous rectification control circuit also comprises an input detection unit (107) and a nonlinear modulation unit (108), wherein an output end of the input detection unit (107) is connected to an input end of the nonlinear modulation unit (108), and an output end of the nonlinear modulation unit (108) is connected to a second input end of the logic control unit (104).
H02M 3/158 - Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only with automatic control of output voltage or current, e.g. switching regulators including plural semiconductor devices as final control devices for a single load
Provided is a contactor power saver, comprising a main power circuit, a current sampling circuit, an error amplification circuit, and a PWM control circuit, wherein the current sampling circuit samples a voltage signal of the main power circuit, and outputs a current sampling signal; the error amplification circuit compares the current sampling signal with a reference voltage, and outputs an error voltage signal; and the PWM control circuit detects the error voltage signal, outputs a drive signal with a constant frequency and a duty ratio proportional to that of the error voltage signal, and controls the turning on and turning off of a switch tube in the main power circuit. According to the present invention, a power factor value can be increased to approximately 0.9, and current of a contactor coil is constant under a wide-range input voltage. Various modules of the control circuit may be integrated, the circuit is simple, and the cost is low.
H01H 47/02 - Circuit arrangements not adapted to a particular application of the relay and designed to obtain desired operating characteristics or to provide energising current for modifying the operation of the relay
91.
CURRENT DETECTION CIRCUIT AND CURRENT DETECTION METHOD
Provided are a current detection circuit and a current detection method. The current detection circuit (100) comprises: an input signal end (IIN), an output signal end (IOUT), an input circuit (11) and a differential current detection amplifier (12), wherein the input circuit (11) comprises two sampling resistors (Rp and Rs), the two sampling resistors (Rp and Rs) are formed by several unit metal resistors of the same type and the same size, and the several unit metal resistors achieve different resistance values through series connection and parallel connection and according to a set current attenuation multiple; the two sampling resistors respectively are a first sampling resistor (Rp) with a relatively low resistance value and a second sampling resistor (Rs) with a relatively high resistance value; the two sampling resistors (Rp and Rs) are respectively connected to two input ends of the differential current detection amplifier (12); the input signal end (IIN) receives a detected current signal and makes same fall on the first sampling resistor (Rp), so as to generate a first current signal reflecting an actual current; and the differential current detection amplifier (12) enables the voltages on the two sampling resistors (Rp and Rs) to be equal so as to generate an attenuated current signal according to the current attenuation multiple.
Provided in the present invention is a controller IC. The controller IC comprises a RI terminal of the controller, a BOS terminal of the controller, a VDD terminal of the controller, and a GATE terminal of the controller. The VDD terminal is connected to an external voltage to power an internal circuit of the controller IC, and the GATE terminal is an output end of the controller IC to control an external circuit of the controller IC to be turned on and off. The BOS terminal is configured to connect to various external devices such that the controller IC has an over-temperature protection function and a synchronous rectification signal pulse transmission function. The present invention achieves function switching by using the same pin combined with peripheral devices, so as to meet the functional needs of different customers, thereby improving the capability of an integrated circuit while keeping the packaging cost unchanged.
A solid state relay comprises a DC input positive terminal (Vin+), a DC input negative terminal (Vin-), a DC output positive terminal (Vout+), a DC output negative terminal (Vout-), a control end positive terminal (K+), a control end negative terminal (K-), an isolation circuit (2), a drive circuit (3), a first switch (S1), a second switch (S2), a first diode (D1), and a second diode (D2). A cross connection of double switches and double flyback diodes is used, preventing a sudden change to the energy stored in a load end circuit. A new path is searched for a continuous current flow by means of a flyback diode, and the energy stored in the load end circuit is fed back to a DC grid by means of the path so as to realize no-loss energy recovery. In addition, the product has a small volume and low costs and may be applied in medium and high power scenarios.
H03K 17/081 - Modifications for protecting switching circuit against overcurrent or overvoltage without feedback from the output circuit to the control circuit
H03K 17/78 - Electronic switching or gating, i.e. not by contact-making and -breaking characterised by the use of specified components by the use, as active elements, of opto-electronic devices, i.e. light-emitting and photoelectric devices electrically- or optically-coupled
H03K 17/687 - Electronic switching or gating, i.e. not by contact-making and -breaking characterised by the use of specified components by the use, as active elements, of semiconductor devices the devices being field-effect transistors
Disclosed are a control method for an asymmetric half-bridge flyback circuit, and a control circuit. The asymmetric half-bridge flyback circuit comprises a main switch S1 and an auxiliary switch S2. The control circuit comprises a sampling circuit and an output voltage comparison circuit, wherein the output voltage comparison circuit outputs a control signal to an additionally arranged pulse width time control circuit, and frequency conversion control over the main switch S1 and the auxiliary switch S2 is achieved by means of a timing circuit and a conduction logic processing circuit, which are additionally arranged, such that the dithering amplitude of an excitation current does not change with an input voltage, a transformer can be designed according to a situation involving a low input voltage, the small size of the transformer is achieved, and the utilization rate within the whole input voltage range is the same.
H02M 3/335 - Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
95.
WAVE VALLEY CONTROL CIRCUIT AND WAVE VALLEY CONTROL METHOD
The present invention provides a wave valley control method and a wave valley control circuit which can expand an input voltage range and which will not cause wave valley switching spikes. The wave valley control circuit comprises a current detection circuit, a secondary feedback circuit, and a drive output circuit. The current detection circuit is used to detect a primary peak value current of a source of a transistor, so as to control a turn-on time of the transistor. The second feedback circuit is used to receive a voltage signal reflecting the impedance of a load and fed back by a voltage sampling isolation feedback circuit. The drive output circuit is used to output a drive signal to the transistor. An input voltage detection circuit and a waveform detection circuit are further comprised. The input voltage detection circuit is used to detect an input voltage of a flyback converter, such that the wave valley control circuit can determine, according to the value of the input voltage, at which wave valley the switching cycle of the transistor will start. The waveform detection circuit is used to sample the waveform of a wave at a drain of the transistor, and count the number of wave valleys.
H02M 3/335 - Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
The present invention discloses a current sampling circuit applicable to primary side current sampling performed on topologies such as flyback converters and forward converters. By providing a DC bias voltage to a current sampling pin of a control IC, a sampling voltage of a primary side current sampling resistor can be greatly decreased. The above current sampling method can significantly reduce resistance and power consumption of a sampling resistor, increase efficiency and power density of a product while expanding the range of applications relating to sampling of a primary side current directly by means of a power resistor, and realize a practical circuit easily.
H02M 3/335 - Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
The present invention provides a transformer. The transformer comprises a pair of combined magnetic cores and a framework provided with four terminal blocks, and can be used in a power supply product provided with two or more PCBs and having a high requirement on a power density. The volume of the power supply product can be reduced, and the space utilization can be improved. The winding and the assembly of the transformer can be automatically carried out, and accordingly, the production efficiency can be improved.
The invention provides an alternating current switching device using two alternating current switches. At the respective two ends of alternating current switches are provided intersecting and connected current transfer circuits formed from two silicon-controlled rectifiers disposed in parallel and flowing in reversed directions, thus forming two current transfer circuits. By means of detecting the direction of an input voltage and the direction of an input current, one of the current transfer circuits can be selectively switched on, such that the direction of the input voltage and the input current can be reversed immediately, or, by means of the two silicon-controlled rectifiers in the current transfer circuit, an arc voltage across the two ends of the alternating current switch can be clamped to an input voltage. The addition of a current transfer circuit to each of the two alternating current switches enables full realization of energy recovery without being limited by the direction of the voltage and current at the time of a fault. When either of the two alternating current switches is disconnected, the current flows via the current transfer circuit without generating an electric arc at the contacts of the alternating current switch. The silicon-controlled rectifiers automatically perform switching-off without generating an electric arc, enabling a fast breaking response speed of the alternating current switch.
H01H 9/54 - Circuit arrangements not adapted to a particular application of the switching device and for which no provision exists elsewhere
H01H 9/30 - Means for extinguishing or preventing arc between current-carrying parts
H03K 17/72 - Bipolar semiconductor devices with more than two PN junctions, e.g. thyristors, programmable unijunction transistors, or with more than three electrodes, e.g. silicon controlled switches, or with more than one electrode connected to the same conductivity region, e.g. unijunction transistors
Provided is an input voltage protection circuit (100) capable of realizing functions such as input under-voltage protection and feedforward compensation without requiring additional leads and sampling resistors. The above two functions use the same lead at different times and are independent from each other. The invention has high precision, and can further reduce production costs and expand ranges of applications of a controller and a switching power supply.
H02H 7/12 - Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for convertersEmergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for rectifiers for static converters or rectifiers
Disclosed in the present invention is a power conversion module, the power conversion comprising two loops; one of the loops is an output voltage-stabilizing loop for controlling the output voltage to be stable; and the other loop is an input voltage-equalizing loop for controlling the magnitude of the input voltage of the module. With regard to a power supply system of which the inputs of N modules are connected in series and the outputs of the N modules are connected in parallel, the input voltages of the respective modules can be equalized by means of the loops, thereby satisfying the requirements of input voltage-equalizing and output current-equalizing in such a power system of which the inputs are connected in series and the outputs are connected in parallel, and ensuring that the system has a high output voltage precision, realizing direct series/parallel connection of a plurality of modules, such that the power supply system is more flexible, and compared with a two-stage scheme, the system has a higher efficiency, a more stable output, and is not influenced by typology.
H02M 3/335 - Conversion of DC power input into DC power output with intermediate conversion into AC by static converters using discharge tubes with control electrode or semiconductor devices with control electrode to produce the intermediate AC using devices of a triode or a transistor type requiring continuous application of a control signal using semiconductor devices only
