A method and a system for establishing a metal interconnection layer capacitance prediction model are disclosed. The method for establishing the metal interconnection layer capacitance prediction model includes: extracting capacitance data of metal interconnect layer capacitors of different sizes by using a post simulation tool and establishing a relationship formula between capacitance value and size of the metal interconnect layer capacitors; separately extracting relationship data between voltage and capacitance value of the metal interconnect layer capacitors and between temperature and capacitance value of the metal interconnect layer capacitors by using a process device simulation tool, and add the relationship data to the relationship formula; and establishing a simulation model in accordance with the relationship formula of capacitance value, size, voltage and temperature. The method has improved modeling speed and reduced circuit design cycle. The model thereof can be applied to the analysis of the small size capacitors with reliability.
G06F 30/367 - Design verification, e.g. using simulation, simulation program with integrated circuit emphasis [SPICE], direct methods or relaxation methods
G06F 119/06 - Power analysis or power optimisation
H01L 23/522 - Arrangements for conducting electric current within the device in operation from one component to another including external interconnections consisting of a multilayer structure of conductive and insulating layers inseparably formed on the semiconductor body
2.
Transistor structure for electrostatic protection and method for manufacturing same
Disclosed are a transistor structure for electrostatic protection and a method for manufacturing the same. The transistor structure comprises: a doped region in a substrate; field oxide layers; a first N-type well region, a P-type well region and a second N-type well region in the doped region and spaced in sequence; a first polycrystalline silicon layer and a second polycrystalline silicon layer covering part of the P-type well region; a first N+ region and a first P+ region respectively formed in the first N-type well region and the second N-type well region second P+ region and the second N+ region are close to the first N+ region and the first P+ region, respectively. The structure may change a current path under forward/reverse operation; thus, a device keeps a good electrostatic protection capability and high robustness.
H01L 27/02 - Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including integrated passive circuit elements with at least one potential-jump barrier or surface barrier
3.
Control method of switching circuit, control circuit of switching circuit, and switching circuit
A control method of a switching circuit, a control circuit of the switching circuit, and the switching circuit are provided. The switching circuit includes an inductor or a transformer. An operational amplification is performed on an output feedback voltage and a first reference voltage of the switching circuit to obtain a compensation voltage. The compensation voltage controls an on-time of a main switch of the switching circuit. When the current of the inductor or the transformer drops to a threshold, after a time, the main switch is switched from off to on, and the output feedback voltage controls the time. When the output feedback voltage is higher than a first threshold voltage, the compensation voltage is pulled down. When the output feedback voltage is lower than a second threshold voltage, the compensation voltage is pulled up.
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 19/165 - Indicating that current or voltage is either above or below a predetermined value or within or outside a predetermined range of values
G01R 19/175 - Indicating the instants of passage of current or voltage through a given value, e.g. passage through zero
H03K 5/24 - Circuits having more than one input and one output for comparing pulses or pulse trains with each other according to input signal characteristics, e.g. slope, integral the characteristic being amplitude
The present disclosure relates to a lateral double-diffused transistor and a manufacturing method of the transistor. The transistor comprises: a substrate; a well region and a drift region both located in the top of the substrate, a source region located in the well region, and a drain region located in the drift region; a first dielectric layer located on a surface of the drift region; a first field plate layer located above the drift region and covering a first portion of the first dielectric layer; a second dielectric layer covering a surface of part of the first field plate layer and stacked on a surface of a second portion of the first dielectric layer; a second field plate layer located on a surface of the second dielectric layer, comprising at least one contact channel. According to the present disclosure, the transistor increases breakdown voltage and reduces on-state resistance.
The present disclosure provides a power transistor driving method. When a power transistor is turned off, a drain-source voltage of the power transistor is detected, and when the power transistor is an N-type component, and a change rate of the drain-source voltage of the power transistor along with time is lower than a first slope threshold, the power transistor is pulled down in a first current; when the change rate of the drain-source voltage of the power transistor along with the time is higher than the first slope threshold, a driving pole of the power transistor is pulled down in a second current; and when the change rate of the drain-source voltage of the power transistor along with the time is lower than the first slope threshold again, a pull-down switch is turned on or the driving pole of the power transistor is pulled down in a third current.
H03K 17/0412 - Modifications for accelerating switching without feedback from the output circuit to the control circuit by measures taken in the control circuit
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
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
6.
Power transistor driving method, driving circuit and switching circuit
The present disclosure provides a power transistor driving method, a driving circuit and a switching circuit. When the power transistor is an N-type component, a driving pole of the power transistor is pulled down in a first current, and when a time period recorded by the timer reaches a first time period, a pull-down switch is turned on or the driving pole of the power transistor is pulled down in a second current; the driving pole of the power transistor is pulled down by the pull-down switch; when a timer is started from a moment at which the power transistor is turned off, the first time period is higher than a time period from a moment at which a switching tube is turned off to a moment at which the change rate of the drain-source voltage of the power transistor along with the time is higher than the first slope.
A clamping switch abnormality detection method, a clamping switch abnormality detection circuit and a switch circuit are provided, wherein an active clamping flyback circuit includes a clamping switch, a main switch and a transformer. When a clamping switch control signal is active, a switching node voltage or a voltage on an auxiliary winding or an magnetizing inductor current is detected, and when the switching node voltage or the voltage on the auxiliary winding or the magnetizing inductor current oscillates, or the switching node voltage is less than a first voltage threshold or the voltage on the auxiliary winding is less than a second voltage threshold, the clamping switch is abnormal or a clamping switch driving circuit is abnormal. The switching node is a common node of the transformer and the main switch, and the transformer includes a primary winding, a secondary winding and the auxiliary winding.
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 1/08 - 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
The present disclosure provides an LED driving circuit and an LED driving method, which may be applied to a switching power supply driving circuit and a linear driving circuit. The LED driving circuit includes an adjusting tube and a driving control circuit of the adjusting tube. The adjusting tube receives an input voltage, and the driving control circuit adjusts the adjusting tube to output an output current to be expected. A reference generating circuit samples an output voltage of the LED driving circuit to obtain an output voltage sampling signal and a reference current signal corresponding to the output voltage sampling signal. A current adjusting circuit samples the output current to obtain an output current sampling signal, receives the corresponding reference current signal, and controls a conduction state of the adjusting tube according to the output current sampling signal and the reference current signal.
A control method and a control circuit for a switching power supply circuit and the switching power supply circuit. The switching power supply circuit includes a main switching transistor, a synchronous rectifier and an inductive element. When a switching signal indicates that the synchronous rectifier is turned from on to off, and the main switching transistor is turned from off to on, a gate voltage of the synchronous rectifier is pulled down to be lower than a threshold voltage of the synchronous rectifier and higher than a zero voltage by using a resistor-capacitor delay effect and timing is started. When a gate voltage of the main switching transistor is detected to rise to a first voltage or the timing reaches a first time, the gate voltage of the synchronous rectifier is pulled down to the zero voltage.
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 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
H02M 1/38 - Means for preventing simultaneous conduction of switches
10.
Switching power supply controlling circuit and controlling method thereof
This invention provides a switching power supply controlling circuit, the switching power supply comprises an upper transistor and a lower transistor, the switching power supply controlling circuit comprises a boost circuit, an input terminal of the boost circuit is connected to an input terminal of the switching power supply, the boost circuit output a first voltage to control a working state of the boost circuit, driving the upper transistor to be in an on state. The switching power supply controlling circuit adopts a boost circuit to provide a driving power for the upper transistor, and there is no need to set a bootstrap pin or a bootstrap capacitor.
An active clamping flyback circuit and a control method are disclosed, comprising a flyback circuit, a clamping circuit and a clamping control circuit. The active clamping flyback circuit comprises a transformer, a main transistor, and a freewheeling diode or a synchronous rectifier, an output feedback circuit is coupling to an auxiliary winding of the transformer and outputs a feedback voltage through a divided voltage The clamping circuit comprises a first capacitor and a first transistor coupling in series, In a discontinuous conduction mode, the clamping control circuit starts timing from a turn-off time of the first transistor, and ends timing until the feedback voltage is reduced to zero voltage, to obtain a first time, The clamping control circuit adjusts a turn-off moment of next switching cycle of the first transistor so that the first time of the next switching cycle is close to a first threshold.
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
12.
Power device driving method and drive circuit for switching circuit, and the switching circuit
A power device driving method and a driving circuit for a switching circuit having a main switching transistor, a synchronous rectifier, and an inductive element. When a switching signal indicates that the synchronous rectifier is turned from on to off and the main switching transistor is turned from off to on, a gate voltage of the synchronous rectifier is pulled down to be lower than a threshold voltage of the synchronous rectifier and higher than zero voltage by a body effect of a MOS transistor, and timing is started. When detecting that a gate voltage of the main switching transistor rises to a first voltage or the timing reaches a first time, the gate voltage of the synchronous rectifier is pulled down to the zero voltage.
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 control method of a single live line charging circuit, a control circuit of a single live line charging circuit, and a single live line charging circuit are provided. The single live line charging circuit includes a first switch, a first conduction element, a first inductor, a second switch, a second conduction element, a third switch, a first input end and a second input end; the first input end is connected to a first end of the first switch through the second conduction element; the first switch, the first conduction element and the first inductor constitute a buck circuit; the first input end is connected to a reference ground through the second switch, the second input end is connected to the reference ground through the third switch, and an alternating current input is connected to the first input end through a load 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
H05B 45/375 - Switched mode power supply [SMPS] using buck topology
H02J 7/00 - Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
14.
Supply method of dual-chip power circuit and dual-chip power circuit
A supply method of a dual-chip power circuit, and a dual-chip power circuit are provided. The dual-chip power circuit includes an inductor, a conduction element, a first chip and a second chip. The first chip includes a control circuit and a supply circuit. The second chip includes a first switch and a drive control circuit, and the drive control circuit is connected to a control end of the first switch. The supply method includes the following steps. When starting, the drive control circuit controls the power circuit to operate in an open-loop state; and if the output voltage of the supply circuit is detected to be established, the supply circuit supplies power to the control circuit, the drive control circuit of the second chip receives an output voltage of the first chip, and then the power circuit operates in a closed-loop state.
H02M 1/08 - Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
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
H02M 1/32 - Means for protecting converters other than by automatic disconnection
15.
Circuit and method for detecting current zero-crossing point and circuit and method for detecting load voltage
A circuit and a method for detecting a current zero-crossing point, and a circuit and method for detecting a load voltage are disclosed. The circuit for detecting current zero-crossing point includes: a load power supply circuit, a voltage-dividing resistor, a transistor switch, a zero-crossing detection circuit; the load power supply circuit includes: a load, a diode, and a transformer; one end of a primary winding of the transformer is connected with the operating voltage input terminal, the other end of the primary winding of the transformer is connected with a first end of the transistor switch and a first end of the voltage-dividing resistor, a second end of the voltage-dividing resistor and a second end of the transistor switch are connected with the ground, the load voltage is controlled by the transistor switch.
H03K 5/24 - Circuits having more than one input and one output for comparing pulses or pulse trains with each other according to input signal characteristics, e.g. slope, integral the characteristic being amplitude
H03K 17/68 - 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 bipolar transistors specially adapted for switching AC currents or voltages
G01R 19/175 - Indicating the instants of passage of current or voltage through a given value, e.g. passage through zero
H03K 17/13 - Modifications for switching at zero crossing
Disclosed a control circuit for a lighting circuit. In the control circuit, an AC input signal provided at an AC input terminal is rectified to obtain a rectified voltage, a low potential end of the rectified voltage is used as a reference ground, a load of the lighting circuit is composed of N strings connected in series, and N is a natural number greater than or equal to 2, when the control circuit detects that the AC input terminal is connected to a dimmer, the control circuit controls the N strings to be simultaneously turned on, when the control circuit detects that the AC input terminal is not connected to the dimmer, the control circuit controls the N strings to be individually turned on in accordance with the rectified voltage. According to the present disclosure, the lighting circuit can obtain a high power factor and is compatible with the dimmer, and the scheme is simple and easy to implement.
H05B 45/44 - Details of LED load circuits with an active control inside an LED matrix
H05B 45/50 - Circuit arrangements for operating light-emitting diodes [LED] responsive to malfunctions or undesirable behaviour of LEDsCircuit arrangements for operating light-emitting diodes [LED] responsive to LED lifeProtective circuits
H05B 33/08 - Circuit arrangements for operating electroluminescent light sources
H05B 45/10 - Controlling the intensity of the light
A flyback switching power supply, comprising a main power switch, a transformer and a rectifier is described. The transformer comprises a primary winding and a secondary winding, the main power switch is connected with the primary winding, the rectifier is connected with the secondary winding. When the output voltage of the flyback switching power supply is lower than a first threshold value, the rectifier is controlled to be turned on for a transient period; by detecting the negative current flowing through the main power switch, performing integral operation on the voltage across the auxiliary winding, and sampling the peak voltage of the drain-to-source voltage of the main power switch for several times, whether the rectifier is turned on can be determined if the output voltage at the secondary side is lower than the threshold voltage, and the main power switch is controlled to be turned on accordingly.
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
This invention provides an active-clamp flyback circuit and a control method thereof. A voltage at the common end of the main power switch tube and the primary-side winding in active-clamp flyback circuit is a node voltage. After the first switch tube is turned off, when the node voltage reaches an input voltage for the first time, start timing. If the node voltage drops to a low threshold before the timing reaches a first time, a turn-off moment of the first switch tube in a next circle is advanced; and if the node voltage is greater than the low threshold when the timing reaches the first time, the turn-off moment of the first switch in the next circle is delayed. This invention can realize zero voltage switching for different input voltages and output voltages, which reduces an energy loss in the 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
19.
Power supplying circuit for drive of switching power supply and switching power supply
A switching power supply using a power switch, and a drive circuit therefor are disclosed. This circuit includes a power supplying capacitor with distal end connected with control terminal of the power switch and proximal end to receive a voltage regulation signal generated by a first control signal and a pulse signal. The power switch may be turned on or off, depending on whether the first control signal is placed in a first state during which the voltage regulation signal is in pulse state with the voltage at said distal end made effective, or in a second state during which the voltage regulation signal is in low-level state with the voltage at said distal end made ineffective. A continuous drive and power supplying for the switching power supply is realized, and the capacitance of said capacitor is small, thereby facilitating circuit integration.
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
H02M 3/157 - 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 with digital control
20.
Isolated switch-mode power supply and control circuit and control method for isolated switch-mode power supply
The present invention discloses an isolated switch-mode power supply, a control circuit and a control method thereof. The main power transistor and the synchronous rectifier transistor are connected respectively to the primary-side winding and secondary-side winding of the isolated switch-mode power supply. The voltage of the control terminal of the main power transistor starts to increase, the main power transistor is turned on gradually, the current flowing through the main power transistor starts to increase until reaches the predetermined current-limiting value; the current of the main power transistor is maintained at the current-limiting value by controlling the voltage of the control terminal of the main power transistor; the secondary-side synchronous rectifier transistor is turned off, the current of the main power transistor decreases from the current-limiting value to the normal operation value, and the main power transistor is completely in an ON condition.
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 1/08 - 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
The present invention provides an active-clamp flyback circuit and a control method thereof. The active-clamp flyback circuit includes a flyback switching power supply, and further includes a first capacitor and a first switch tube. One end of the first capacitor is connected with a high potential end of an input power supply, the other end is connected with a first end of the first switch tube, and a second end of the first switch tube is connected with a common end of the main power switch tube and the primary winding. A turn-off moment of the first switch tube is adjusted according to time when the main power switch tube is turned on and the first switch tube is turned off and voltages at both ends of the magnetizing inductor. The present invention can reduce the turn-on loss of the main power switch tube.
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 1/08 - Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
The present invention provides an isolating switch circuit and a control method. The present invention takes first time information as a characteristic to control and adjust primary and secondary sides The primary side identifies the first time information by detecting the voltage between two ends of a main power switch transistor, and the secondary side compares a sampling output voltage or/and output current with a corresponding reference signal to obtain a first control signal representing the first time information. The present invention does not need to use the optical coupler to carry out isolated transmission of primary and secondary signals, which reduces the cost of the circuit, and the freewheeling time of a parasitic diode of a synchronous rectification transistor is taken as a characteristic to carry out identifying and controlling, such that power consumption is low and the control and adjustment is more precisely.
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
A protection circuit and an illumination driving circuit are described herein. The protection circuit comprises a detection circuit, detecting a current flowing through a first switch to obtain a current detection signal and determining whether there is leakage at an input terminal according to the current detection signal; a control circuit, controlling the first switch to switch on intermittently, detecting the current flowing through the first switch by the detection circuit during a switch-on period of the first switch, and keeping the load at a disconnection state if the detection circuit determines there is leakage; and the first switch, connected to the input terminal, and a control terminal of the first switch being connected to the control circuit, and the first switch being controlled by the control circuit to be switched on intermittently. The present invention has the protection function and enhances safety during load removing and installation processes.
There is provided a dimming circuit, a dimming method and a LED driving circuit. On the basis of the dimming of a dimmer, the circuit according to the disclosure generates a plurality of current reference signals corresponding to a plurality of loads in accordance with a dimming signal, to change a ratio of load currents of the plurality of loads, so that, the adjustment of color temperature is implemented, wherein the dimming signal represents the changes of switching operation or dimming speed of the dimmer, and the ratio of current load currents of the plurality of loads is latched or a predetermined ratio of load currents is latched. According to the disclosure, the dimmer can be used for directly adjusting color temperature, without the need for a MCU, so that, the system compatibility is improved and the cost is decreased.
The present disclosure discloses a bleeder circuit and a control method thereof, and an LED control circuit. The present disclosure is applied in an LED control circuit of TRIAC dimming, directly or indirectly detects cross-zero point of input voltage; after cross-zero point of the input voltage is delayed by a second time, the bleeder module works to generate bleeder current, and a time between turn-on time of the TRIAC and a time that a driving circuit input current achieves a predetermined value (maintaining current of TRIAC) is a first time. During the first time, the bleeder circuit generates losses; when the first time is greater than a predetermined value, the second time is prolonged; when the first time is smaller than the predetermined value, the second time is reduced, such that the first time is close to or equal to the predetermined value. By using the present disclosure, the second time, which is used as the delay time, is self-adaptively adjusted according to the first time and the predetermined value, and the bleeder power consumption is reduced and system efficiency is enhanced.
The present invention discloses a bleeder circuit; solutions of the present invention may be applied in linear driving and switch driving solutions; a threshold voltage is a zero crossing value, and when the input voltage is zero crossing, the load current at this time is zero; a bleeder current is generated to make the input current greater than a holding current of a TRIAC dimmer, to maintain turning-on of the TRIAC dimmer, and a second time is set as a delay time, which reduces power consumption. In the application of switch driving solution, the current regulating circuit is controlled to be enabled according to the waveform features of the previous and latter halves of periods of the sine wave as well as the size of the input current of the driving circuit. The present invention reduces bleeder current, improves system efficiency and system reliability while ensuring the dimming performance; meanwhile, it is good for enlarging the maximum turning-on angle of TRIAC, and satisfies the requirement for maximum output current more easily.
For controlling a switch power supply, an adjustment module produces a first control voltage by comparing a period of a switch signal with a reference period. A current source module generates a first charging current according to the first control voltage. A pulse signal generating module converts the first charging current into an on time signal or off time signal of a switch transistor. A driving module produces the switch signal according to the on time or off time signal of the switching transistor, so as to control the turn on and turn off signal of a switching transistor. A time measurement module obtains a time parameter according to the switch signal, and generates a periodic adjustment signal according to the time parameter. The adjustment module adjusts the reference period according to the periodic adjustment signal to adjust the period of the switch signal.
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
H02J 3/38 - Arrangements for parallelly feeding a single network by two or more generators, converters or transformers
H02J 3/44 - Synchronising a generator for connection to a network or to another generator with means for ensuring correct phase sequence
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
H03K 17/06 - Modifications for ensuring a fully conducting state
H03K 17/56 - 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
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
28.
Integrated circuit with multiplexed pin and pin multiplexing method
The present invention provides an integrated circuit with a multiplexed pin and a pin multiplexing method. The multiplexed pin of the integrated circuit extends out with two connecting ends to receive two logic level signals which are finally restored in a chip. A first signal input end receives a signal representing whether to enable or disable, a second signal input end receives a function signal which achieves a certain function, and a diode, a resistor, and a first current source are used together to achieve multiplexing of the pin based on turn-on and clamping characteristics of the diode. The number of pins to be packaged and the area occupied by a chip on board are reduced, which is conducive to a small package design of the chip.
H03K 5/24 - Circuits having more than one input and one output for comparing pulses or pulse trains with each other according to input signal characteristics, e.g. slope, integral the characteristic being amplitude
29.
Synchronous rectification control circuit, method and flyback switch circuit
The present invention provides a synchronous rectification control circuit, a method and a flyback switching circuit. A drive circuit outputs a drive signal to control the turn-on and turn-off of a synchronous rectification transistor; a threshold comparison circuit controls the drive circuit to output a pull-up drive signal to turn on the synchronous rectification transistor when a drain-source voltage is lower than a preset low threshold voltage and controls the drive circuit to output a pull-down drive signal to turn off the synchronous rectification transistor when the drain-source voltage is higher than or equal to a preset high threshold voltage; a voltage regulation control circuit controls the drive circuit to output a drive signal for pulling up a voltage of the drive signal to a preset pull-up voltage high value when the drain-source voltage is lower than a preset voltage regulation reference value.
H03B 1/00 - GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNERGENERATION OF NOISE BY SUCH CIRCUITS Details
H03K 3/00 - Circuits for generating electric pulsesMonostable, bistable or multistable circuits
H02M 1/38 - Means for preventing simultaneous conduction of switches
H02M 1/08 - Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
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
H03K 5/24 - Circuits having more than one input and one output for comparing pulses or pulse trains with each other according to input signal characteristics, e.g. slope, integral the characteristic being amplitude
Disclosed a drive method, a drive circuit for a power switch and a power supply system. During the turning-on period of the power switch, which can be roughly divided into three processes, a current limiting module is used to limit the current flowing through the power switch for preventing current overshoot, a logic control module is used for controlling the current limiting module not to operate before the turning-on period and the control terminal of the power switch is turned off; during the turning-on period, a feedback circuit adjusts the gate voltage of the power switch for controlling the current flowing through the power switch to reach a predetermined limited value quickly and then maintain at the limited value until the power switch is fully turned on. The current limiting module can be employed in various embodiments. According to the disclosure, the current flowing through the power switch can be effectively controlled during the turning-on period, and the driving time for turning on the power switch is decreased.
H03K 17/284 - Modifications for introducing a time delay before switching in field-effect transistor switches
H03K 17/16 - Modifications for eliminating interference voltages or currents
H03K 17/0416 - Modifications for accelerating switching without feedback from the output circuit to the control circuit by measures taken in the output circuit
31.
Control circuit and control method for switch circuit and switching-mode power supply circuit
The present invention provides a control circuit and a control method for a switch circuit and a switching-mode power supply circuit. The control method comprises following steps: detecting an output voltage or an output current, and adjusting an upper limit value and a lower limit value of an inductor current according to a result of comparing the output voltage or the output current with the corresponding reference; and sampling the inductor current, and controlling a main switch transistor in the circuit to be switched off when a sampling current rises to the upper limit value, and controlling the main switch transistor to be switched on when the sampling current drops to the lower limit value. In the present invention, the inductor current is fast in response without overshoot, the output voltage drops very little, there is no overshoot in a process of voltage recovery, and circuit transient response is fast.
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 1/096 - 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 the power supply of the control circuit being connected in parallel to the main switching element
H02M 1/36 - Means for starting or stopping converters
H03K 17/042 - Modifications for accelerating switching by feedback from the output circuit to the control circuit
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
H02M 3/07 - Conversion of DC power input into DC power output without intermediate conversion into AC by static converters using resistors or capacitors, e.g. potential divider using capacitors charged and discharged alternately by semiconductor devices with control electrode
32.
Control method and control circuit for switch circuit and switch circuit device
The present invention provides a control method and a control circuit for a switch circuit and a corresponding switch circuit device. The control circuit comprises: an acquiring module, configured to acquire first time; a comparing module, connected with the acquiring module and configured to compare first time with first fixed time; and an adjusting module, connected with the comparing module. The adjusting module adjusts a cycle of a turn-on signal of a first switch transistor to second fixed time when the first time is less than the first fixed time. The adjusting module adjusts the sum of second time and the first fixed time to the second fixed time to achieve spread spectrum when the first time is more than the first fixed time. The control circuit for the switch circuit provided by the present invention is used for controlling the switch circuit for spread spectrum.
H03K 17/04 - Modifications for accelerating switching
H03K 5/26 - Circuits having more than one input and one output for comparing pulses or pulse trains with each other according to input signal characteristics, e.g. slope, integral the characteristic being duration, interval, position, frequency, or sequence
H03K 19/20 - Logic circuits, i.e. having at least two inputs acting on one outputInverting circuits characterised by logic function, e.g. AND, OR, NOR, NOT circuits
H03K 17/14 - Modifications for compensating variations of physical values, e.g. of temperature
33.
Control circuit and device with edge comparison for switching circuit
A control method, a control circuit and a device for a switching circuit are disclosed, for fixing a frequency of the switching circuit when the switching circuit is operated under CCM. The present disclosure is suitable to various switching circuits, and an application scope of the control method of the switching circuit can be extended. The control method comprises: starting measuring time at a rising edge of a turn-on signal of the first switch; reducing a turn-on time or a turn-off time of the first switch when a first measured time is reached, and the rising edge in a next cycle of the turn-on signal has not arrived; increasing the turn-on time or the turn-off time of the first switch when the rising edge in the next cycle of the turn-on signal arrives but the first measured time is not reached.
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
H02M 3/157 - 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 with digital control
A ripple removing circuit and an LED control circuit applying the same are described herein. The LED control circuit receives alternating current input, converts the input into direct current with ripples and supplies power for an LED load. The direct current with ripples is connected to a positive end of the LED load, a negative end of the load is connected to a first end of a regulation tube, and a second end of the regulation tube is grounded. A first capacitor is connected between a control end of the regulation tube and the ground, and the time constant of the filter circuit formed by the first capacitor, a current generating circuit and a current source is far greater than a power frequency period. The current flowing across the regulation tube is approximately a direct current free of ripples, thereby decreasing the current ripples going across the LED load.
The present disclosure relates to a circuit and a method for overcurrent control and a power supply system including the same. When the system operates normally, a reference voltage has a constant value. When a short circuit or an overcurrent occurs at an output of the system, the reference voltage will be pulled down,. When the system is recovered from the short circuit or the overcurrent state, the reference voltage increases slowly up to a steady value. A feedback signal of an output voltage follows the reference voltage and increases slowly. Thus, an overshoot of the output voltage can be effectively eliminated to avoid damages to the system.
H02M 1/32 - Means for protecting converters other than by automatic disconnection
H02H 9/02 - Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
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
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
This invention provides a switch control circuit and a switch circuit. When a main transistor on-time reaches a constant on-time, whether an inductor current reaches an instruction current is detected; if the inductor current fails to reach the instruction current, the main transistor on-time is prolonged; the main transistor is turned off and the auxiliary transistor is turned on until the inductor current reaches the instruction current or exceeds the instruction current by a certain threshold; when the main transistor is turned off and the auxiliary transistor is turned on, the inductor current is detected in real time to check whether the inductor current is smaller than the instruction current, and the auxiliary transistor is turned off and the main transistor is turned on again if yes.
H03K 17/284 - Modifications for introducing a time delay before switching in field-effect transistor switches
H03K 19/20 - Logic circuits, i.e. having at least two inputs acting on one outputInverting circuits characterised by logic function, e.g. AND, OR, NOR, NOT circuits
H03K 17/16 - Modifications for eliminating interference voltages or currents
37.
Circuit and method for detecting current zero-crossing point, and circuit and method for detecting load voltage
A circuit and a method for detecting a current zero-crossing point, and a circuit and method for detecting a load voltage are disclosed. The circuit for detecting current zero-crossing point includes: a load power supply circuit (14), a voltage-dividing resistor (16), a transistor switch (15), a zero-crossing detection circuit (19); the load power supply circuit (14) includes: a load (11), a diode (13), and an inductor (12); one end of the load power supply circuit (14) is connected with the operating voltage input terminal, the other end of the load power supply circuit (14) is connected with a first end of the transistor switch (15) and a first end of the voltage-dividing resistor (16), a second end of the voltage-dividing resistor (16) and a second end of the transistor switch (15) are connected with the ground, the load voltage is controlled by the transistor switch (15), the voltage-dividing terminal of the voltage-dividing resistor (16) is connected to a signal input terminal of the zero-crossing detection circuit (19), the zero-crossing detection circuit (19) is used to determine whether the current of the diode (13) crosses zero to obtain the on time of the diode (13), and the circuit for detecting load voltage uses the on time of the diode (13) and the on time of the transistor switch (15) to obtain the load voltage. The circuits are simple, but with high detection efficiency and low cost.
H03K 5/24 - Circuits having more than one input and one output for comparing pulses or pulse trains with each other according to input signal characteristics, e.g. slope, integral the characteristic being amplitude
H03K 17/13 - Modifications for switching at zero crossing
H03K 17/68 - 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 bipolar transistors specially adapted for switching AC currents or voltages
G01R 19/175 - Indicating the instants of passage of current or voltage through a given value, e.g. passage through zero
H05B 33/08 - Circuit arrangements for operating electroluminescent light sources
A power supply protection circuit and a method is described herein. The power supply protection circuit comprises a current control unit, a voltage feedback unit, and a current pull-up unit. The voltage feedback unit is connected to the current control unit, the voltage feedback unit obtains a feedback voltage of an output voltage and feeds back the feedback voltage to the current control unit, and the current control unit uses the feedback voltage to control the current control unit to regulate an output current. The current pull-up unit is connected to a feedback terminal of the voltage feedback unit, and the current pull-up unit provides the voltage feedback unit with a pull-up current to determine whether the feedback terminal of the voltage feedback unit is short-circuited.
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
H02M 1/32 - Means for protecting converters other than by automatic disconnection
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
H02H 9/04 - Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
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 9/02 - Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess current
H03K 17/082 - Modifications for protecting switching circuit against overcurrent or overvoltage by feedback from the output to the control circuit
A self-adaption current control circuit includes: a regulating transistor, a first sampling comparison circuit, a proportion control circuit, a variable sampling resistor, and a second sampling comparison circuit. The self-adaption current control circuit adjusts the resistance value of the variable sampling resistor and the coefficient of the proportion circuit simultaneously through the proportion control circuit. Meanwhile, the resistance value of the variable sampling resistor and the coefficient of the proportion circuit can be increased or decreased in the same proportion so that the input voltage of a second sampling comparison circuit can be in an appropriate input range.
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
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
H02M 1/08 - Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
H05B 33/08 - Circuit arrangements for operating electroluminescent light sources
H02M 1/15 - Arrangements for reducing ripples from DC input or output using active elements
40.
Integrated buck/boost battery management for power storage and delivery
For managing a battery, an apparatus includes a first switch electrically connected to a first connection and a second connection. At least one of a load and a power supply is electrically connected the first connection. In addition, an inductor is electrically connected to the second connection. A second switch is electrical connected to the first connection and electrically connected to the common. The third switch is electrically connected to a third connection and electrically connected to the battery. The fourth switch is electrically connected to the third connection and electrical connected to the common. The inductor is also electrical connected the third connection.
H02J 7/00 - Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
H02J 7/35 - Parallel operation in networks using both storage and other DC sources, e.g. providing buffering with light sensitive cells
H02J 7/02 - Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from AC mains by converters
patents