Abstract

A motor driving method having a motor rotational direction feedback mechanism is performed by a motor driver. The motor driver includes a motor driving circuit, a motor state detecting circuit and a feedback circuit. The motor driver drives a motor. The motor state detecting circuit detects a rotational state of the motor. The rotational state of the motor includes a rotation direction. The feedback circuit sets at least one of a plurality of waveforms of a feedback signal according to the rotational state of the motor, and outputs the feedback signal.

IPC Classes  ?

• H02P 6/30 - Arrangements for controlling the direction of rotation

Abstract

A reverse current protection circuit is applicable to a high-side switch and a low-side switch. A first terminal of the high-side switch is coupled to an input voltage. A first terminal of the low-side switch is connected to a second terminal of the high-side switch. The reverse current protection circuit detects the input voltage received by the first terminal of the high-side switch and an output voltage of a second terminal of the low-side switch, and accordingly controls the low-side switch. Before a reverse current being larger than a reverse current threshold flows from the output voltage of the second terminal of the low-side switch sequentially through the low-side switch and the high-side switch to the input voltage, the reverse current protection circuit turns off the low-side switch.

IPC Classes  ?

• 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

Abstract

A dynamic addressing system for data transmission includes a plurality of slave devices and a master device. The master device sends a clock signal and a data signal to a first one of the plurality of slave devices. The first one of the slave devices modulates levels of the clock signal, and outputs the modulated clock signal and the data signal to a next one of the slave devices. Each of the plurality of slave devices, except for the first one and a last one of the slave devices, modulates the levels of the clock signal from a previous one of the slave devices, and outputs the modulated clock signal and the data signal to a next one of the slave devices. Each of the plurality of slave devices sets its own individual device address according to the received clock signal and the received data signal.

IPC Classes  ?

• G06F 13/42 - Bus transfer protocol, e.g. handshakeSynchronisation
• G06F 13/40 - Bus structure

Abstract

A power converter having a transient response improvement mechanism includes a first high-side switch, a first low-side switch, a second high-side switch, a second low-side switch and a control circuit. When an output voltage of a first terminal of the second high-side switch is lower than a lower limit threshold voltage, the control turns on the first high-side switch and the second low-side switch, and turns off the first low-side switch and the second high-side switch. Conversely, when the output voltage is higher than an upper limit threshold voltage, the control turns on the first low-side switch and the second high-side switch, and turns off the first high-side switch and the second low-side switch.

IPC Classes  ?

• 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 1/00 - Details of apparatus for conversion
• 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

Abstract

A light source drive system and a failure reporting method thereof. The light source drive system includes a control circuit and a drive circuit module. The driving circuit module has at least one light source driving circuit connected with the control circuit through a fault transmission line. The light source drive circuit has a fault arbitration circuit, including: a detection circuit, a fault reporting circuit, a switch and a fault control circuit. The fault control circuit initiates the counting duty cycle when the fault condition occurs, and controls the switch to be on in the detection time and the switch to be off in the delay time. The fault control circuit controls the detection circuit to detect a first level of the fault transmission line in the duty cycle, and outputs the detection time of different durations of time according to the different types of fault conditions.

IPC Classes  ?

• H05B 47/20 - Responsive to malfunctions or to light source lifeCircuit arrangements for operating light sources in general, i.e. where the type of light source is not relevant for protection

Abstract

A power converter having a voltage difference control mechanism includes a high-side switch, a low-side switch, a high-side off-state driver circuit, a high-side on-state driver circuit, a high-side off-state driver circuit and a high-side voltage difference modulating circuit. The high-side on-state driver circuit switches the high-side switch from an off-state to an on-state. The high-side voltage difference modulating circuit outputs a floating voltage to a first power input terminal of the high-side off-state driver circuit according to an output voltage of the output node. The high-side off-state driver circuit uses the floating voltage to switch the high-side switch from the on-state to the off-state such that a voltage difference between the floating voltage and the output voltage falls within a target voltage range.

IPC Classes  ?

• 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 1/00 - Details of apparatus for conversion

Abstract

A multi-loop control circuit and a control method thereof. The multi-loop control circuit includes an amplification stage circuit and a current selection circuitry. The amplification stage circuit includes a first operational transconductance amplifier that outputs a first transconductance amplification current and a second operational transconductance amplifier that outputs a second transconductance amplification current. The current selection circuitry receives the first transconductance amplification current and the second transconductance amplification current to output an error output current. The current selection circuitry selects and outputs a largest one among the first transconductance amplification current and the second transconductance amplification current as the error output current, and an error amplification signal is generated from the error output current.

IPC Classes  ?

• H03F 3/45 - Differential amplifiers

Abstract

A motor driver circuit having a dynamic duty cycle modulation mechanism is provided. The motor driver circuit includes a magnetic field change sensing circuit, a control circuit, a driver circuit and an output stage circuit. The magnetic field change sensing circuit senses a plurality of voltages that are generated with a change in a magnetic field caused by a motor whose rotor is rotating to output a commutation signal. The control circuit sets a plurality of control duty cycles according to the commutation signal. The control circuit outputs a control duty cycle signal according to each of the control duty cycles. The driver circuit outputs a driving signal according to the control duty cycle signal. The output stage circuit operates to output a plurality of output stage signals to the motor according to the driving signal.

IPC Classes  ?

• H02P 6/18 - Circuit arrangements for detecting position without separate position detecting elements

Abstract

A motor driver having an overcurrent protection mechanism is provided. The motor driver includes an output stage circuit and a motor driving circuit. The output stage circuit includes a plurality of high-side switches, a plurality of low-side switches and a motor driving circuit. When an overcurrent event occurs in the output stage circuit according to a parameter of any one of the plurality of low-side switches, the motor driving circuit turns off all of the plurality of high-side switches. When all of the high-side switches are turned off and the overcurrent event is still occurring in the output stage circuit, the motor driving circuit turns off all of the plurality of low-side switches and continually turns off the high-side switches.

IPC Classes  ?

• H02P 29/024 - Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load

Abstract

A power converter having a voltage modulated based on low-side sensed data is provided. The power converter includes a high-side switch, a low-side switch, a feedback circuit, a current sensing modulation circuit, a comparison circuit, a control circuit and a driver circuit. The feedback circuit outputs a feedback signal according to a voltage of an inductor. The current sensing modulation circuit senses a current that flows from an output terminal of the power converter through the inductor and the low-side switch, and modulates the feedback signal or a ramp voltage (or a duty cycle) according to the current. The comparison circuit compares a voltage of the feedback signal with the ramp voltage to output a first comparing signal. The control circuit outputs a control signal according to the first comparing signal. The driver circuit drives the high-side and the low-side switch according to the control signal.

IPC Classes  ?

• 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 1/00 - Details of apparatus for conversion
• H02M 1/08 - Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters

Abstract

A motor driver having a progressive driving mechanism is provided. The motor driver includes a progressive driving setting circuit, a progressive waveform constructing circuit and a motor driving circuit. The progressive driving setting circuit outputs a progressive driving setting signal that is progressively changed over time. The progressive driving setting signal has a plurality of progressive driving set voltages respectively at a plurality of set time points. The progressive driving set voltages are different from each other. The progressive waveform constructing circuit sets a plurality of waveforms of a progressive waveform signal according to the progressive driving set voltages. Duty cycles of the plurality of waveforms of the progressive waveform signal are different from each other. The motor driving circuit drives a motor according to the progressive waveform signal.

IPC Classes  ?

• H02P 3/18 - Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter for stopping or slowing an AC motor
• H02P 3/02 - Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters Details

Abstract

A motor driver for setting duty cycles based on a temperature is provided. The motor driver senses a temperature of an environment around a motor. The motor driver sets a duty cycle modulation value according to the sensed temperature, and modulates a preset duty cycle to form a startup duty cycle according to the duty cycle modulation value. The motor driver sets or modulates duty cycles of one or more waveforms of a startup signal to be equal to the startup duty cycle. The motor driver outputs the startup signal to the motor.

IPC Classes  ?

• H02P 29/60 - Controlling or determining the temperature of the motor or of the drive
• H02K 11/25 - Devices for sensing temperature, or actuated thereby
• H03K 7/08 - Duration or width modulation

Abstract

A motor braking system using a multi-phase reversal mechanism is provided. In a motor driving mode, the motor braking system, according to one or more of voltage signals respectively of three phases of a three-phase motor, determines which one of the three phases of the three-phase motor is a phase from which a current flows as a first driving phase, and selects another of the three phases of the three-phase motor as a second driving phase. In a motor braking mode, the motor braking system changes a driving operation performed on the three-phase motor such that a reverse current flows from the second driving phase to the first driving phase.

IPC Classes  ?

• H02P 3/20 - Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter for stopping or slowing an AC motor by reversal of phase sequence of connections to the motor

Abstract

An adaptive voltage modulation circuit is provided. The adaptive voltage modulation circuit includes a plurality of driver circuits and a voltage control circuit. A first one of the driver circuits outputs a feedback signal to a next one of the driver circuits according to data of a load connected thereto. Each of the driver circuits, except for the first one and a last one of the driver circuits, according to the data of the load connected thereto and the feedback signal from a previous one of the driver circuits, outputs a next feedback signal to a next one of the driver circuits. The last one of the driver circuits, according to the data of the load connected thereto and the feedback signal from a previous one of the driver circuits, instructs the voltage control circuit to supply a common modulation power signal to each of the loads.

IPC Classes  ?

• H05B 45/30 - Driver circuits

Abstract

A power convertor increasing driving voltages of switches is provided. The power convertor includes a high-side switch, a low-side switch, a driver circuit, a bootstrap capacitor and a charging circuit. The driver circuit is connected to a control terminal of the high-side switch and a control terminal of the low-side switch. A first terminal of the bootstrap capacitor is connected to the driver circuit and the charging circuit. The charging circuit charges the bootstrap capacitor, and the driver circuit drives the high-side switch and the low-side switch by using a voltage of a first terminal of the bootstrap capacitor.

IPC Classes  ?

• 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 3/06 - 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

Abstract

A power converter of limiting a negative current is provided. The power converter includes a high-side switch, a low-side switch, a low-side detecting circuit, a control circuit and a driver circuit. The low-side detecting circuit detects a negative current flowing through the low-side switch or an on-time of the low-side switch to output a low-side detected signal. The control circuit outputs a control signal according to the low-side detected signal. The driver circuit, according to the control signal, outputs a high-side on-time signal to a control terminal of the high-side switch and outputs a low-side on-time signal to a control terminal of the low-side switch.

IPC Classes  ?

• H02M 1/00 - Details of apparatus for conversion

Abstract

A power converter for adaptively adjusting a frequency is provided. The power converter includes a high-side switch, a low-side switch, a feedback circuit, a frequency adjusting circuit, a control circuit and a driver circuit. The feedback circuit outputs a regulation on-time signal according to a voltage signal of a node between a second terminal of an inductor and a first terminal of a capacitor. When the frequency adjusting circuit determines that a duty cycle of a waveform of the regulation on-time signal is not larger than a duty cycle of a waveform of a minimum on-time signal, the frequency adjusting circuit adjusts a frequency of a clock signal. The control circuit outputs a control signal according to the adjusted clock signal. The driver circuit drives the high-side switch and the low-side switch according to the control signal.

IPC Classes  ?

• H02M 1/00 - Details of apparatus for conversion
• H02M 1/14 - Arrangements for reducing ripples from DC input or output
• 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
• H03K 5/156 - Arrangements in which a continuous pulse train is transformed into a train having a desired pattern

Abstract

A power conversion system having spread spectrum and phase shifting mechanisms is provided. Each of a plurality of power converters of the power conversion system includes a spread spectrum instructing circuit, a synchronization signal detecting circuit, an oscillator circuit and a phase shifting circuit. The oscillator circuit outputs an oscillation signal according to a spread spectrum instruction parameter from the spread spectrum instructing circuit or a synchronization detected signal from the synchronization signal detecting circuit. The phase shifting circuit shifts phases of a plurality of waveforms of the oscillation signal to generate a clock signal. The phase shifting circuit of each of the plurality of power converters outputs the clock signal to a next one of the plurality of power converters. The synchronization signal detecting circuit of each of the power converters detects the clock signal to output the synchronization detected signal.

IPC Classes  ?

• H02M 1/00 - Details of apparatus for conversion

Abstract

A power converter having a negative current control mechanism is provided. The power converter includes an error amplifying circuit, a first comparator, a switch control circuit, a compensation trigger circuit and a compensation current supplying circuit. The error amplifying circuit multiplies a difference between a voltage of a second terminal of an inductor and a reference voltage by a gain to output a first error amplified signal. The first comparator compares a voltage of a first terminal of the inductor with a voltage of the resistor connected to a low-side switch to output a comparison signal. The switch control circuit controls a high-side switch and the low-side switch according to the comparison signal. The compensation trigger circuit, according to the comparison signal, determines whether to trigger the compensation current supplying circuit to supply a compensation current to the resistor according to the first error amplified signal.

IPC Classes  ?

• H02M 1/00 - Details of apparatus for conversion

Abstract

A power converter with surge suppression is provided. The power converter includes a high-side switch, a low-side switch, a control circuit, and a discharge circuit. The control circuit connects the high-side switch and the low-side switch, and controls the operation of the high-side switch and the low-side switch. The discharge circuit receives an output voltage drop signal from an external ramp indication circuit. When the output voltage drop signal indicates that the output voltage of an output voltage signal at the output end of the power converter is dropping, the discharge circuit discharges the input voltage source. When the output voltage drop signal indicates that the output voltage has stopped dropping, the discharge circuit stops discharging the input voltage source.

IPC Classes  ?

• H02M 1/32 - Means for protecting converters other than by automatic disconnection
• 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
• H03K 17/06 - Modifications for ensuring a fully conducting state

Abstract

A power supply protection circuit with surge suppression and a method thereof are provided. The power supply protection circuit used in the power converter includes a discharge circuit and a surge suppression circuit. The surge detection circuit determines whether the discharge conditions are compliant based on the control signal of the low-side switch in the power converter and the output voltage. When the discharge conditions are non-compliant, the surge detection circuit outputs a discharge signal to the discharge circuit, so that the discharge circuit discharges the output voltage. When the discharge conditions are determined to be non-compliant, the surge detection circuit stops outputting the discharge signal to the discharge circuit, so that the discharge circuit stops discharging the output voltage.

IPC Classes  ?

• 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

Abstract

A multi-output power converter having a single inductor is provided. The multi-output power converter includes a high-side switch, a low-side switch, a control circuit, a plurality of output switches and a signal duty distributing circuit. A node between a first terminal of the low-side switch and a second terminal of the high-side switch is connected to a first terminal of the inductor. A first terminal of each of the plurality of output switches is connected to a second terminal of the inductor. The signal duty distributing circuit sets duty cycles of a plurality of waveforms of a plurality of switching signals, according to output voltages respectively from second terminals of the plurality of output switches. The signal duty distributing circuit outputs the plurality of switching signals respectively to control terminals of the plurality of output switches.

IPC Classes  ?

• 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

Abstract

A power converter having an on-time compensation mechanism is provided. The power converter includes a first switch, a second switch, a third switch, a fourth switch and a control circuit. A first terminal of the first switch is coupled with an input voltage. A first terminal of the second switch is connected to a second terminal of the first switch and a first terminal of an inductor. A first terminal of the fourth switch is connected to a second terminal of the third switch and a second terminal of the inductor. The control circuit, according to an on-time of the fourth switch operating in a boost mode, compensates on-times of the first and the second switches operating in a buck mode. In a buck-boost mode, the control circuit controls the on-times of the first and the second switches to be equal to the compensated on-times, respectively.

IPC Classes  ?

• 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 1/00 - Details of apparatus for conversion
• 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

Abstract

A power converter for dynamically adjusting voltage headroom based on a current is provided. The power converter includes a high-side switch, a low-side switch, a sensor circuit, a current source, a mirror circuit, a reference voltage adjusting circuit and a control circuit. The sensor circuit senses a current flowing through a power receiving component to output a sensed current to a first terminal of a first transistor of a current mirror. A first terminal of the second transistor of the current mirror is connected to the current source. The reference voltage adjusting circuit sets a reference voltage according to a current from a node between the first terminal of the second transistor and the current source. The control circuit controls the high-side switch and the low-side switch according to the reference voltage.

IPC Classes  ?

• 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 1/00 - Details of apparatus for conversion
• H02M 1/32 - Means for protecting converters other than by automatic disconnection

Abstract

A power supply circuit having a current control mechanism is provided. The power supply circuit includes a charging driver, a plurality of input current processing circuits, a charging circuit and a control circuit. The charging driver includes a plurality of switch components and a driver circuit. The control circuit controls the plurality of input current processing circuits respectively to switch the plurality of switch components. At least one of a plurality of input currents that are supplied by a plurality of external input power sources flows to the driver circuit through at least one of the plurality of switch components. The driver circuit transmits the at least one of the plurality of input currents to the charging circuit, and drives the charging circuit to use the at least one of the plurality of input currents to charge an electronic device.

IPC Classes  ?

• H02J 7/00 - Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries

Abstract

A motor driver for starting up a motor having any resistance is provided. The motor driver outputs a motor startup signal to the motor according to an initial startup duty cycle, senses a current value of a current signal of the motor multiple times, compares the current value of the motor that is sensed for multiple times with a reference current value and accordingly sets a plurality of pulse waves of a pulse width modulation signal. Then, the motor driver detects duty cycles of the pulse waves of the pulse width modulation signal as startup detection duty cycles. Then, the motor driver outputs a motor startup signal to the motor according to the startup detection duty cycles.

IPC Classes  ?

• H02P 21/34 - Arrangements for starting
• H02P 21/18 - Estimation of position or speed
• H02P 21/22 - Current control, e.g. using a current control loop
• H02P 23/14 - Estimation or adaptation of motor parameters, e.g. rotor time constant, flux, speed, current or voltage
• H02P 27/14 - Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using DC to AC converters or inverters with pulse width modulation with three or more levels of voltage

Abstract

A motor driver having a start-up duty cycle modulation mechanism is provided. The motor driver includes a control circuit, a driver circuit, an output stage circuit and a current detector circuit. The control circuit outputs a start-up control signal having a plurality of waveforms. The driver circuit outputs a start-up driving signal according to the start-up control signal. The output stage circuit operates to output a motor start-up signal to a motor according to the start-up driving signal for starting up the motor. The current detector circuit detects a current of the motor. The control circuit, according to the detected current of the motor, modulates duty cycles of the plurality of waveforms of the start-up control signal.

IPC Classes  ?

• H02P 1/52 - Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters for starting an individual synchronous motor by progressive increase of frequency of supply to motor

Abstract

An odd and even bit weight equalization method and system are provided. The method includes processes of: determining whether or not bit values are equal to a weight value; if not, setting even and odd initial bits, and if yes, setting a next even bit of an even bit to which an even bit position is last shifted previously as the even initial bit, and setting a next odd bit of an odd bit to which an odd bit position is last shifted previously; shifting the even bit position from the even initial bit to other even bits and shifting the odd bit position from the odd initial bit to other odd bits; and adjusting the even and odd initial bits, and the even and odd bits to which the even and odd bit positions are shifted, to be equal to the weight value.

IPC Classes  ?

• G06F 7/50 - AddingSubtracting
• G06F 5/01 - Methods or arrangements for data conversion without changing the order or content of the data handled for shifting, e.g. justifying, scaling, normalising

Abstract

A surge suppression protection circuit is provided. The surge suppression protection circuit includes an input voltage detector circuit, a reference voltage generator circuit, an operational amplifier and a first switch component. A first terminal of the first switch component is coupled with an input voltage. A second terminal of the first switch component is grounded. A control terminal of the first switch component is connected to an output terminal of the operational amplifier. The input voltage detector circuit detects the input voltage to output a first input detected voltage. The reference voltage generator circuit outputs a first reference voltage. The operational amplifier amplifies a difference between the first input detected voltage and the first reference voltage by a gain to output an operational amplified signal. The first switch component operates according to the operational amplified signal from the operational amplifier.

IPC Classes  ?

• H02H 9/04 - Emergency protective circuit arrangements for limiting excess current or voltage without disconnection responsive to excess voltage
• H02H 1/00 - Details of emergency protective circuit arrangements

Abstract

A motor controller with a data bit expansion mechanism is provided. The motor controller sets a plurality of pieces of target waveform characteristic data that are used respectively within a plurality of magnetic pole position time intervals to output a motor control output instruction. The motor controller, according to each of the plurality of pieces of target waveform characteristic data, generates a plurality of pieces of sub-target waveform characteristic data in a bit number expansion instruction. The plurality of pieces of sub-target waveform characteristic data are used respectively within a plurality of bit expansion time intervals. The bit number of each of the plurality of pieces of sub-target waveform characteristic data is smaller than an upper limit bit number. The motor controller generates a plurality of bit-expansion waveforms according to the bit number expansion instruction for controlling a motor.

IPC Classes  ?

• H02P 6/08 - Arrangements for controlling the speed or torque of a single motor
• H02P 6/06 - Arrangements for speed regulation of a single motor wherein the motor speed is measured and compared with a given physical value so as to adjust the motor speed
• H03M 1/12 - Analogue/digital converters
• H03M 5/14 - Code representation, e.g. transition, for a given bit cell depending on the information in one or more adjacent bit cells, e.g. delay modulation code, double density code

Abstract

A positive hysteresis elimination comparison circuit and a motor driver having a positive hysteresis elimination comparison circuit are provided. The motor driver includes a comparator and a hysteresis switching circuit. The comparator compares a voltage of a first voltage signal received by a first input terminal of the comparator with a voltage of a second voltage signal received by a second input terminal of the comparator to output a comparing signal within a comparison time. When the voltage of the first voltage signal is lower than the voltage of the second voltage signal, the comparison time is delayed. When the voltage of the first voltage signal is higher than the voltage of the second voltage signal and a positive hysteresis elimination signal is received by a first control terminal of the comparator, the comparison time is not delayed.

IPC Classes  ?

• H03K 3/00 - Circuits for generating electric pulsesMonostable, bistable or multistable circuits
• H03K 3/0233 - Bistable circuits
• H03K 5/08 - Shaping pulses by limiting, by thresholding, by slicing, i.e. combined limiting and thresholding
• H03K 5/1252 - Suppression or limitation of noise or interference

Abstract

A motor rotational speed limit circuit is provided. The motor rotational speed limit circuit includes a controller circuit, a detector circuit and a driver circuit. The controller circuit includes an open loop circuit and a closed loop circuit. The open loop circuit outputs an open loop rotational speed control command. The closed loop circuit outputs a closed loop rotational speed control command. The detector circuit detects a rotational speed of a motor. The driver circuit, according to the rotational speed of the motor, selects one of the open loop rotation control command and the closed loop rotation control command to output a driving signal to the motor.

IPC Classes  ?

• H02P 29/10 - Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors for preventing overspeed or under speed
• H02P 29/032 - Preventing damage to the motor, e.g. setting individual current limits for different drive conditions

Abstract

A detector circuit having a current conversion mechanism for a power converter is provided. An output terminal of the power converter is connected to a first terminal of an inductor. The detector circuit detects a current flowing through the inductor as a detected current, and converts the detected current into a detected voltage. The detector circuit compares the detected voltage with a reference voltage to generate a comparison signal. Each time when a level of the comparison signal reaches a reference level, the detector circuit counts a count value.

IPC Classes  ?

• H02M 1/32 - Means for protecting converters other than by automatic disconnection
• H02M 1/00 - Details of apparatus for conversion

Abstract

A motor driver improving resonance noise caused by a motor is provided. The motor driver sets one or more duty cycle threshold ranges. When a duty cycle of each waveform of a duty cycle input signal does not fall within the one or more duty cycle threshold ranges, the motor driver directly drives the motor according to the duty cycle input signal. When the duty cycle of any waveforms of the duty cycle input signal falls within the one or more duty cycle threshold ranges, the motor driver adjusts the duty cycles of some waveforms of the duty cycle input signal within specified time such that the duty cycles of at least two of the plurality of waveforms of the duty cycle input signal are different from each other, and drives the motor according to the adjusted duty cycle input signal.

IPC Classes  ?

• H03K 17/16 - Modifications for eliminating interference voltages or currents
• H02P 7/03 - Arrangements for regulating or controlling the speed or torque of electric DC motors for controlling the direction of rotation of DC motors
• H02P 7/29 - Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual DC dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices controlling armature supply only using pulse modulation

Abstract

A power converter having a stable output voltage is provided. The power converter includes a high-side switch, a low-side switch, an error amplifier, a low-side feedback circuit, a pulse wave signal generator circuit, a control circuit and a driver circuit. The low-side feedback circuit outputs a blank clock signal according to a voltage of a second end of the low-side switch, a low-side drive signal of a control end of the low-side switch and an error amplified signal from the error amplifier. The pulse wave signal generator circuit sets a frequency of a clock signal according to the blank clock signal. The control circuit outputs a control signal according to the clock signal. The driver circuit, according to the control signal, outputs a high-side drive signal to a control end of the high-side switch and outputs the low-side drive signal to the control end of the low-side switch.

IPC Classes  ?

• 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 1/00 - Details of apparatus for conversion
• H02M 1/08 - Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
• H02M 1/36 - Means for starting or stopping converters

Abstract

A compensation circuit of realizing equivalent capacitance amplification is provided. The compensation circuit includes an error amplifier, a resistor and a capacitor. A first terminal of the resistor is connected to a first output terminal of the error amplifier. A second terminal of the resistor is connected to a second output terminal of the error amplifier and the capacitor. An amplified error current signal outputted from the first output terminal of the error amplifier flows through the resistor, and is then divided into a capacitor charging signal and an error amplified reverse current signal. The capacitor charging signal flows to the capacitor. The error amplified reverse current signal flows through the second output terminal of the error amplifier into the error amplifier. The error amplified reverse current signal is larger than the capacitor charging signal.

IPC Classes  ?

• G05F 1/575 - 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 characterised by the feedback circuit
• G05F 1/565 - 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 sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor
• H03F 1/02 - Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
• H03F 1/08 - Modifications of amplifiers to reduce detrimental influences of internal impedances of amplifying elements
• H03F 1/34 - Negative-feedback-circuit arrangements with or without positive feedback

Abstract

A motor rotational speed control system and method having a duty cycle variable modulation mechanism is provided. The motor rotational speed control system is performed by the motor rotational speed control system including a motor rotational speed detector and a motor driver. When a rotational speed of a motor detected by the motor rotational speed detector is larger than or equal to a set rotational speed, the motor driver modulates duty cycles of a plurality of waveforms of an on-time signal, and modulates a duty cycle difference between the duty cycle of each of the plurality of waveforms and the duty cycle of a previous one or every other one of the plurality of waveforms in the on-time signal. The motor driver, according to the on-time signal, drives the motor such that the rotational speed of the motor is limited to be smaller than the set rotational speed.

IPC Classes  ?

• H02P 23/20 - Controlling the acceleration or deceleration
• H02P 23/14 - Estimation or adaptation of motor parameters, e.g. rotor time constant, flux, speed, current or voltage
• H02P 25/022 - Synchronous motors
• H02P 25/04 - Single phase motors, e.g. capacitor motors

Abstract

A power converter having a current limit protection mechanism is provided. An error amplifier of the power converter multiples a difference between (a divided voltage of) an output voltage of the power converter and a reference voltage by a gain to output an error amplified signal. A comparator of the power converter compares the error amplified signal with a ramp signal to output an on-time signal. A current limiting circuit of the power converter detects data related to a high-side switch and a low-side switch of the power converter. The current limiting circuit of the power converter compares working periods and non-working periods of the on-time signal with blanking times to output a current limiting signal. A control circuit of the power converter, according to the current limiting signal, determines whether to control the high-side switch and the low-side switch according to the detected data.

IPC Classes  ?

• 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 1/00 - Details of apparatus for conversion
• H02M 1/32 - Means for protecting converters other than by automatic disconnection

Abstract

A motor starting circuit having a dead time setting mechanism is provided. The motor starting circuit includes a rotational speed detection circuit, a start-up commutation selector circuit, a control circuit, a driver circuit and an output stage circuit. The rotational speed detection circuit detects a rotational speed of a motor. The start-up commutation selector circuit determines whether or not to set a dead time within a motor start-up time interval to output a commutation instructing signal according to the rotational speed of the motor. The control circuit controls the driver circuit to drive the output stage circuit so as to start up the motor according to the commutation instructing signal.

IPC Classes  ?

• H02P 6/20 - Arrangements for starting
• H02P 6/15 - Controlling commutation time

Abstract

A low-dropout regulator having an output voltage switching circuit is provided. In the low-dropout regulator, a low-dropout linear regulator circuit outputs a regulating signal according to a voltage difference between a second terminal of a transistor and a regulating threshold voltage signal or a reference voltage. In the low-dropout regulator, a switch error amplifier circuit outputs a pull-up control signal according to a voltage difference between the second terminal of the transistor and a voltage pull-up switching signal. When a voltage selector circuit of the low-dropout regulator selects the regulating signal, the transistor operates to regulate an output voltage of the low-dropout regulator according to the regulating signal. When the voltage selector circuit selects the pull-up control signal, a switch component is turned on by the pull-up control signal such that the output voltage of the low-dropout regulator is directly pulled up by an input voltage.

IPC Classes  ?

• G05F 1/575 - 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 characterised by the feedback circuit
• G05F 1/565 - 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 sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor
• H02M 1/00 - Details of apparatus for conversion

Abstract

A hub transmission direction control method, a hub and a control circuit are provided. The method includes processes of: detecting a clock signal of a host serial clock line; starting timing when the clock signal meets a trigger condition; when the timed time reaches a preset time, detecting a host data signal of a host data line communicated with a host device and a local data signal of a local data line communicated with a local device; and setting, according to a detection result of the host data signal and the local data signal, a first transmission direction in which data is transmitted from the host data line to the local data line, or a second transmission direction in which data is transmitted from the local data line to the host data line, as a transmission direction between the host data line and the local data line.

IPC Classes  ?

• G06F 13/42 - Bus transfer protocol, e.g. handshakeSynchronisation
• G06F 13/40 - Bus structure

Abstract

A motor driver using a spread spectrum mechanism for reducing electromagnetic interference is provided. The motor driver generates a plurality of waveforms in each of a plurality of on-time signals, and modulates frequencies of at least some of the plurality of waveforms in each of the plurality of on-time signals to be different from each other. The motor driver drives the motor according to the modulated plurality of on-time signals. As a result, electromagnetic wave energy emitted by the motor driver of the present disclosure is changed or dispersed such that the electromagnetic wave energy is not overly concentrated at a same frequency. Therefore, the motor driver of the present disclosure is prevented from emitting the accumulated and amplified electromagnetic wave energy to cause electromagnetic interference to the operations of other circuit components.

IPC Classes  ?

• H02P 6/12 - Monitoring commutationProviding indication of commutation failure
• H02K 11/02 - Structural association of dynamo-electric machines with electric components or with devices for shielding, monitoring or protection for suppression of electromagnetic interference
• H02K 11/33 - Drive circuits, e.g. power electronics
• H03K 7/06 - Frequency or rate modulation, i.e. PFM or PRM
• H04B 1/715 - Interference-related aspects

Abstract

A motor driver for adjusting power based on a common voltage is provided. The motor driver includes a common voltage difference calculation circuit, a duty cycle determination circuit, a signal generator circuit, a control circuit, a driver circuit and an output stage circuit. The common voltage difference calculation circuit calculates a difference between the common voltage received by the output stage circuit and a threshold. The duty cycle determination circuit determines a duty cycle adjustment value according to the difference. The signal generator circuit adjusts a plurality of waveform signals according to the duty cycle adjustment value. The control circuit outputs control signals according to the plurality of waveform signals. The driver circuit outputs driving signals according to the control signals. The output stage circuit operates to drive the motor according to the common voltage and the driving signals.

IPC Classes  ?

• H02P 27/06 - Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using DC to AC converters or inverters
• H02P 29/40 - Regulating or controlling the amount of current drawn or delivered by the motor for controlling the mechanical load

Abstract

A power supply control system for a multi-phase power converter is provided. The power supply control system classifies each of a plurality of power converters into one of a plurality of power groups. The power supply control system selects one of the plurality of power converters classified in each of the plurality of power groups as a master power converter, and selects others of the plurality of power converters in each of the plurality of power groups as slave power converters. The power supply control system, according to data of the master power converter, outputs an on-time controlling signal for controlling an on-time of a high-side switch and an on-time of a low-side switch of each of the plurality of power converters, so as to control the plurality of power converters for supplying appropriate power to electronic devices.

IPC Classes  ?

• 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 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

Abstract

A power supply controller circuit for effectively saving power under an electrical specification is provided. First terminals of a capacitor and a third switch component are connected to a first terminal of a power supply device. First terminals of first and second switch components are connected to a second terminal of the capacitor. Second terminals of the first and second switch components are connected to a second terminal of the power supply device. A first terminal of a fourth switch component is connected to a second terminal of the third switch component. A control circuit controls operations of the first to third switch components and a driver circuit drives the fourth switch component in the power supply controller circuit, such that a current flowing through the power supply controller circuit to the second terminal of the power supply device is not smaller than a current threshold.

IPC Classes  ?

• H02M 1/00 - Details of apparatus for conversion
• H02M 1/32 - Means for protecting converters other than by automatic disconnection

Abstract

A driver circuit for adaptively switching a light-emitting diode current is provided. The driver circuit at least includes a first transistor, a first switching component, a second transistor, a third transistor and an operational amplifier. A first terminal of the first transistor is connected to a first input terminal of the operational amplifier. A first terminal of the first switching component is connected to a control terminal of the first transistor. A control terminal of the second transistor is connected to a second terminal of the first switching component. A first terminal of the third transistor is connected to one or more light-emitting diodes. A second terminal of the third transistor is connected to a first terminal of the second transistor and a second input terminal of the operational amplifier. An output terminal of the operational amplifier is connected to a control terminal of the third transistor.

IPC Classes  ?

• H05B 45/325 - Pulse-width modulation [PWM]

Abstract

A power converter improving input overvoltage from output voltage drop is provided. The power converter includes a high-side switch, a low-side switch, a control circuit, a voltage threshold determining circuit and a voltage drop suppression circuit. The voltage threshold determining circuit determines whether or not an output voltage of the power converter is dropping to determine or adjust a voltage threshold. The voltage drop suppression circuit detects a voltage of a first terminal of the high-side switch. When the voltage drop suppression circuit determines that the detected voltage of the first terminal of the high-side switch is higher than the voltage threshold, the voltage drop suppression circuit pulls down the voltage of the first terminal of the high-side switch.

IPC Classes  ?

• H02M 1/00 - Details of apparatus for conversion
• H02M 1/14 - Arrangements for reducing ripples from DC input or output
• 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

Abstract

A power converter having a spectrum spreading control mechanism is provided. In the power converter, a buffer circuit, according to a plurality of energy upper limit values respectively of a plurality of frequency bands falling within a switching frequency range, determines a plurality of buffering ratios corresponding respectively to the plurality of frequency bands. In the power converter, the buffer circuit buffers a voltage signal from an inductor based on one of the plurality of buffering ratios that corresponds to one of the plurality of frequency bands within which a switching frequency of the high-side switch and the low-side switch currently falls. In the power converter, an on-time determining circuit determines an on-time of the high-side switch and an on-time of the low-side switch, according to the buffered voltage signal.

IPC Classes  ?

• 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 1/00 - Details of apparatus for conversion
• H02M 1/44 - Circuits or arrangements for compensating for electromagnetic interference in converters or inverters
• H03K 19/0185 - Coupling arrangementsInterface arrangements using field-effect transistors only

Abstract

A power-saving supply controller circuit of supplying power based on electrical specifications is provided. The power-saving supply controller circuit includes a first switch component, a second switch component and a control circuit. A first terminal of the first switch component and a first terminal of a capacitor are connected to a first terminal of a power supply device. Second terminals of the first and second switch components are connected to a second terminal of the power supply device. A first terminal of the second switch component is connected to a second terminal of the capacitor. When a current is supplied from the first terminal of the power supply device, the control circuit controls the first and second switch components such that a current flowing back to the second terminal of the power supply device is not smaller than a specified current.

IPC Classes  ?

• 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
• 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
• G05F 1/565 - 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 sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor

Abstract

A power switch circuit of adaptively limiting a current is provided. The power switch circuit includes a current sensing resistor, a power switch, a charge pump and an adaptive current limiting circuit. A first terminal of the current sensing resistor is coupled to an input voltage. A first terminal of the power switch is connected to a second terminal of the current sensing resistor. A second terminal of the power switch is connected to a first terminal of a capacitor. A second terminal of the capacitor is grounded. An output terminal of the charge pump is connected to a control terminal of the power switch. According to the input voltage, a voltage of the current sensing resistor and a voltage of the capacitor, the adaptive current limiting circuit determines whether to control an operation of the power switch for limiting the current flowing through the power switch.

IPC Classes  ?

• 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
• H03K 17/082 - Modifications for protecting switching circuit against overcurrent or overvoltage by feedback from the output to the control circuit

Abstract

A single-wire multi-device cascade addressing system is provided. In the multi-device cascade addressing system, a plurality of devices are arranged sequentially and connected in series with each other, and a first device and a final device among the plurality of devices are connected to a controller. The first device addresses itself according to an addressing command packet having an individual device identification address from the controller and outputs the adjusted addressing command packet to the next device. Each of the plurality of devices except for the first device addresses itself according to the addressing command packet from the previous device. Each of the plurality of devices except for the first and final devices adjusts the addressing command packet from the previous device, and outputs the adjusted addressing command packet to the next device. The final device transmits the addressing command packet from the previous device to the controller.

IPC Classes  ?

• H04L 12/40 - Bus networks
• H04L 61/5038 - Address allocation for local use, e.g. in LAN or USB networks, or in a controller area network [CAN]

Abstract

A motor driver circuit having a reverse current detection mechanism is provided. The motor driver circuit includes a reverse current detector circuit, a control circuit, a driver circuit and an output stage circuit. The reverse current detector circuit detects a current flowing through a motor within a preset time interval to output a current detected signal. The control circuit determines whether or not the detected current is a reverse current to output a control signal according to the current detected signal. The driver circuit outputs a driving signal according to the control signal. The output stage circuit operates to output an output-stage signal to the motor according to the driving signal. The motor rotates according to the output-stage signal.

IPC Classes  ?

• H02P 7/03 - Arrangements for regulating or controlling the speed or torque of electric DC motors for controlling the direction of rotation of DC motors
• H02H 7/08 - 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 dynamo-electric motors
• H02P 7/29 - Arrangements for regulating or controlling the speed or torque of electric DC motors for regulating or controlling an individual DC dynamo-electric motor by varying field or armature current by master control with auxiliary power using discharge tubes or semiconductor devices using semiconductor devices controlling armature supply only using pulse modulation

Abstract

A power converter having a load transition detecting mechanism is provided. A comparator of the power converter compares an output voltage of the power converter or a divided voltage thereof with a reference voltage to output a comparison signal. A load transition detecting circuit of the power converter detects the comparison signal, and samples and holds some of a plurality of waveforms of the comparison signal. The load transition detecting circuit of the power converter calculates an average value of a plurality of parameters respectively of the sampled waveforms as a load steady state reference value. The load transition detecting circuit of the power converter compares the parameter of each of the plurality of waveforms of the comparison signal with the load steady state reference value to determine whether or not a load is in a steady state or in a transient state.

IPC Classes  ?

• 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

Abstract

A power converter having a charge pump frequency switching control mechanism is provided. In the power converter, frequencies of a plurality of pulse waves of a clock signal are determined, according to a level of a high-side control signal outputted to a control terminal of a high-side switch from a control circuit or a voltage of the control terminal (and a voltage of a second terminal) of the high-side switch. In the power converter, a charge pump supplies power to a high-side driver circuit at the frequencies of the clock signal, and the high-side driver circuit uses the power from the charge pump to drive the high-side switch and to pull up the voltage of the control terminal of the high-side switch.

IPC Classes  ?

• 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
• H02M 1/00 - Details of apparatus for conversion
• H03K 17/041 - Modifications for accelerating switching without feedback from the output circuit to the control circuit

Abstract

A dimming control system having an asynchronous pulse width modulation mechanism is provided. When a transition in a level of a synchronous signal meets a specified transition, a width of a pulse wave that is currently generated in a pulse width modulation signal may not reach a preset pulse width. Under this condition, the dimming control system delays generating subsequent pulse waves of the pulse width modulation signal until the width of the pulse wave that is currently generated reaches the preset pulse width. Alternatively, the dimming control system forcibly transits the pulse wave that is currently generated from a high level to a low level to stop increasing the width of the pulse wave, maintains the pulse wave as an incomplete pulse wave, and increases widths of one or more of the subsequent pulse waves of the pulse width modulation signal.

IPC Classes  ?

• H05B 45/325 - Pulse-width modulation [PWM]
• H05B 45/10 - Controlling the intensity of the light

Abstract

A power converter having a multi-mode switching mechanism is provided. The power converter includes a first switch, a second switch, a low-side switch, an output calculating circuit and a control circuit. A first terminal of the first switch is connected to a first terminal of an inductor. A second terminal of the inductor is connected to an input power source. A first terminal of the second switch is connected to a second terminal of the first switch. A second terminal of the second switch is connected to the output calculating circuit. A first terminal of the low-side switch is connected to the first terminal of the first switch. A control circuit is connected to a control terminal of the first switch, a control terminal of the second switch, a control terminal of the low-side switch and the output calculating circuit.

IPC Classes  ?

• 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 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

Abstract

A multi-fan control system is provided. A controller, within each of a plurality of time intervals, outputs a control signal including a reading command to one of a plurality of fans, and outputs a control signal including a writing command to another of the plurality of fans. The controller, within each of the plurality of time intervals, only reads operation state data of the one of the plurality of fans that receives the control signal including the reading command, and writes operation control commands respectively into the plurality of fans.

IPC Classes  ?

• H05K 7/20 - Modifications to facilitate cooling, ventilating, or heating

Abstract

A power converter with adaptively adjustable voltages based on detected currents is provided. A current detector circuit detects values of currents flowing through a plurality of switch components multiple times. Each time when all of the detected values of the currents flowing through the plurality of switch components are normal current values, a counter counts down a reference voltage to decrease the reference voltage. When the detected value of the current flowing through any one of the plurality of switch components is an abnormal current value, the counter counts up the reference voltage to increase the reference voltage. A controller circuit controls a high-side switch and a low-side switch to operate according to the reference voltage received from the counter each time.

IPC Classes  ?

• 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 1/00 - Details of apparatus for conversion
• H05B 45/375 - Switched mode power supply [SMPS] using buck topology

Abstract

A motor driver having a temperature sensing mechanism is provided. A control circuit determines a time for outputting a controlling signal according to a pulse-width modulation signal received from an external pulse-width modulation circuit. A driving circuit outputs a driving signal according to the controlling signal. An output stage circuit operates according to the driving signal to output an output stage signal to a motor to drive the motor to rotate. In a temperature sensing mode, a thermal sensor circuit senses a temperature inside the motor driver to output a temperature sensing signal. An external system circuit determines whether or not the motor driver causes overheating to the motor when being adapted to the motor according to the temperature sensing signal, and evaluates whether or not the motor driver is applicable to the motor.

IPC Classes  ?

• H02P 27/08 - Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using DC to AC converters or inverters with pulse width modulation
• H02P 29/68 - Controlling or determining the temperature of the motor or of the drive based on the temperature of a drive component or a semiconductor component

Abstract

A power converter having a feedback voltage adjusting mechanism for a negative voltage is provided. Input terminals of an operational amplifier are respectively connected to a zero voltage and a first terminal of a first resistor. A second terminal of the first resistor is connected to a second terminal of a low-side switch. A first current source is connected to an output terminal of the operational amplifier and a first terminal of a second resistor. A second terminal of the second resistor is connected to the first terminal of the first resistor. The first current source outputs a first current according to a signal output by the operational amplifier. A second current source outputs a second current being m times the first current and is connected to a first terminal of a third resistor. A voltage of the first terminal of the third resistor is a feedback voltage.

IPC Classes  ?

• H02M 1/32 - Means for protecting converters other than by automatic disconnection
• H02M 1/00 - Details of apparatus for conversion
• 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

Abstract

A power converter having an overvoltage protection mechanism is provided. A node between a second terminal of the high-side switch and a first terminal of a low-side switch is connected to an inductor. When an output current or an output voltage of the power converter must be released, the output current of the power converter flows to the input power source sequentially through the inductor, the high-side switch being turned on. Under this condition, when an overvoltage protecting circuit determines that a current or a voltage of the inductor or a current or a voltage of the input power source is larger than a threshold, the output current of the power converter flows to a ground through the overvoltage protecting circuit.

IPC Classes  ?

• H02M 1/32 - Means for protecting converters other than by automatic disconnection
• H02M 1/00 - Details of apparatus for conversion
• H02M 1/08 - Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters

Abstract

A motor controller having a pulse width modulation generating mechanism is provided. A triangular wave signal generator circuit generates a triangular wave signal. A comparator compares the triangular wave signal with an input control signal to determine a pulse width modulation signal. A signal detector circuit detects a duty cycle of each of a plurality of pulse waves of the pulse width modulation signal. A control converter circuit converts the duty cycle of each of the plurality of pulse waves of the pulse width modulation signal as an arithmetic value into a control value, according to a preset ratio. A driver circuit drives a motor to rotate according to the control value from the control converter circuit.

IPC Classes  ?

• H02P 27/04 - Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage
• H02P 29/00 - Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
• H03K 3/017 - Adjustment of width or dutycycle of pulses
• H03K 4/06 - Generating pulses having essentially a finite slope or stepped portions having triangular shape

Abstract

A buck converter using an ultra-low working current is provided. An error amplifier amplifies a difference between a voltage of an output terminal of the buck converter and a reference voltage to output an error amplified signal. A comparator compares a voltage of the error amplified signal with a ramp voltage to output a comparison signal. A control circuit controls a driver circuit to drive a high-side switch and a low-side switch according to the comparison signal. When the buck converter does not enter an ultra-low current mode, a low current controller circuit controls a system circuit to obtain an input current from an input power source. When the buck converter enters the ultra-low current mode, the low current controller circuit controls the system circuit to stop obtaining the input current from the input power source.

IPC Classes  ?

• H02M 1/00 - Details of apparatus for conversion
• 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

Abstract

A power converter having a high-side driving mechanism consuming low power is provided. A first terminal of a high-side switch is coupled to an input voltage. A second terminal of the high-side switch is connected to a first terminal of a low-side switch. A second terminal of the low-side switch is grounded. A first terminal of a bootstrap capacitor is connected to a node between the second terminal of the high-side switch and the first terminal of the low-side switch. A second terminal of the bootstrap capacitor is connected to a charging circuit. The charging circuit charges the bootstrap capacitor and detects data of the bootstrap capacitor. The charging circuit, according to the detected data of the bootstrap capacitor, determines whether or not to stop charging the bootstrap capacitor or to adjust charging of the bootstrap capacitor.

IPC Classes  ?

• 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

Abstract

A motor driver using a motor magnetic pole reference controlling mechanism is provided. A motor position detecting circuit detects a rotor of a motor to determine a plurality of magnetic pole positions to which the rotor of the motor is switched respectively during a plurality of time intervals. A reference magnetic pole switching circuit selects one of the plurality of time intervals according to a change in rotational speed of the motor over time. The reference magnetic pole switching circuit uses the magnetic pole position to which the rotor of the motor is switched during the one of the plurality of time intervals as magnetic pole reference data. A motor driving circuit drives the motor according to the magnetic pole reference data from the reference magnetic pole switching circuit.

IPC Classes  ?

• H02P 6/185 - Circuit arrangements for detecting position without separate position detecting elements using inductance sensing, e.g. pulse excitation
• H02K 11/33 - Drive circuits, e.g. power electronics

Abstract

A motor driver having a motor abnormality detection mechanism is provided. A motor position detecting circuit detects a change in a state of a rotor of the motor switching between a plurality of magnetic pole positions to output a commutation signal. An abnormality determining circuit, according the commutation signal, determines a plurality of time intervals during which the rotor of the motor is switched to the plurality of magnetic pole positions respectively to output an abnormality detected signal. A rotational protection controller circuit outputs a rotation protecting signal to a motor driving circuit according to the abnormality detected signal. A motor driving circuit drives the motor according to the rotation protecting signal. When the abnormality detected signal received by the rotational protection controller circuit indicates that the motor abnormally rotates, the rotational protection controller circuit adjusts the rotation protecting signal outputted to the motor driving circuit.

IPC Classes  ?

• H02P 6/16 - Circuit arrangements for detecting position
• H02P 29/024 - Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load
• H02P 3/22 - Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter for stopping or slowing an AC motor by short-circuit or resistive braking

Abstract

A motor driver of setting pulse width modulation at commutation time points of a motor is provided. A commutation control circuit outputs a phase control signal and a commutation starting signal according to a preset phase angle and a commutation signal of the motor. A pulse width modulation calculating circuit determines a starting time point of each of a plurality of cycles of a pulse width modulation signal according to the commutation starting signal. The pulse width modulation calculating circuit determines time of each of the plurality of cycles of the pulse width modulation signal according to the phase control signal. The pulse width modulation calculating circuit determines widths of a plurality of pulse waves of the pulse width modulation signal according to a target rotational speed of the motor. A motor driver circuit drives the motor according to the pulse width modulation signal.

IPC Classes  ?

• H02K 11/33 - Drive circuits, e.g. power electronics
• H02P 6/15 - Controlling commutation time
• H02P 6/18 - Circuit arrangements for detecting position without separate position detecting elements
• H02P 27/08 - Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using DC to AC converters or inverters with pulse width modulation

Abstract

An open-loop inductor current emulating circuit is provided. A current sensor circuit senses a current flowing through a first terminal of a low-side switch to output a current sensed signal. An emulation controller circuit outputs a plurality of charging current signals according to currents of a plurality of rising waveforms of the current sensed signal. The emulation controller circuit outputs a plurality of discharging current signals according to currents of a plurality of falling waveforms of the current sensed signal. A charging and discharging circuit generates a plurality of charging currents according to the charging current signals, and generates a plurality of discharging currents according to the discharging current signals. The charging and discharging circuit alternatively outputs the charging currents and the discharging currents to the capacitor to charge and discharge the capacitor multiple times, thereby achieving a purpose of emulating an inductor current.

IPC Classes  ?

• 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 1/00 - Details of apparatus for conversion

Abstract

A piezoelectric valve driver device is provided. A first driver is connected to a first side of a valve. A second driver is connected to a second side of the valve. A power charging circuit is coupled between an external power source and a second voltage. A charging and discharging current controller is connected to the first driver, the second driver and the power charging circuit, and is configured to control currents of the first driver, the second driver and the power charging circuit. When a driver circuit switches the valve from a closed state to an open state, the first driver provides a first voltage to the first side of the valve, and the second voltage that is outputted to the second side of the valve by the second driver is discharged to output a discharging current to the external power source through the power charging circuit.

IPC Classes  ?

• F16K 99/00 - Subject matter not provided for in other groups of this subclass

Abstract

A power converter having a multi-slope compensation mechanism is provided. A multi-slope compensation circuit of the power converter includes a plurality of first capacitors, a comparator and a plurality of first resistors. A first terminal of each of the plurality of first capacitors and a node between a second terminal of a high-side switch and a first terminal of a low-side switch are connected to an inductor. A plurality of first input terminals of a comparator are respectively connected to second terminals of the plurality of first capacitors, and are respectively connected to first terminals of the plurality of first resistors. Second terminals of the plurality of first resistors are coupled to a second reference voltage. A second input terminal of the comparator is coupled to a first reference voltage. An output terminal of the comparator is connected to an input terminal of a driver circuit.

IPC Classes  ?

• 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 3/158 - 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

Abstract

A motor forward and reverse rotation detector and a motor driver having the motor forward and reverse rotation detector are provided. A rotor position detecting circuit detects a position of a rotor of a motor to output a commutation signal. A forward and reverse rotation detecting circuit detects a back electromotive force of the motor to output a back electromotive force detected signal. The forward and reverse rotation detecting circuit, according to a phase relationship and a phase difference between the back electromotive force detected signal and the commutation signal, determines which one of a forward direction and a reverse direction is a rotational direction of the motor to output a rotational direction detected signal. A motor driving circuit drives the motor according to the rotational direction detected signal.

IPC Classes  ?

• H02P 6/22 - Arrangements for starting in a selected direction of rotation
• H02K 11/215 - Magnetic effect devices, e.g. Hall-effect or magneto-resistive elements
• H02P 6/30 - Arrangements for controlling the direction of rotation

Abstract

A motor driver using a correcting mechanism on a sensed motor position is provided. A rotor position detector circuit senses a position of a rotor of a motor to output a commutation signal. A back electromotive force detector circuit detects a back electromotive force signal of the motor. An actual phase difference calculator circuit calculates a phase difference between the back electromotive force signal and the commutation signal as an actual phase difference. An error phase angle calculator circuit calculates a difference between the actual phase difference and a reference phase difference as an error phase angle. A motor driving circuit corrects the commutation signal according to the error phase angle. The motor driving circuit determines the position of the rotor of the motor to drive the motor according to the corrected commutation signal.

IPC Classes  ?

• H02P 6/16 - Circuit arrangements for detecting position
• G01B 7/30 - Measuring arrangements characterised by the use of electric or magnetic techniques for measuring angles or tapersMeasuring arrangements characterised by the use of electric or magnetic techniques for testing the alignment of axes
• G01D 5/14 - Mechanical means for transferring the output of a sensing memberMeans for converting the output of a sensing member to another variable where the form or nature of the sensing member does not constrain the means for convertingTransducers not specially adapted for a specific variable using electric or magnetic means influencing the magnitude of a current or voltage
• G01R 25/00 - Arrangements for measuring phase angle between a voltage and a current or between voltages or currents

Abstract

An optical sensor having a common light sensing circuit for synchronously sensing a plurality of color light signals is provided. A plurality of photoelectric components respectively convert the plurality of color light signals into a plurality of photocurrents. A plurality of gain amplifiers respectively multiply the plurality of photocurrents by a plurality of gains to output a plurality of amplified photocurrents. An arithmetic circuit adds up the plurality of amplified photocurrents to output a total amplified photocurrent signal. A common analog-to-digital converter converts the total amplified photocurrent signal into a digital signal. A counter circuit counts bit values of the digital signal to output a counting signal.

IPC Classes  ?

• G01J 3/50 - Measurement of colourColour measuring devices, e.g. colorimeters using electric radiation detectors

Abstract

A power converter having a multi-stage high-side driving mechanism is provided. A control circuit outputs a first high-side control signal. A high-side driving circuit, according to the first high-side control signal and a first input voltage signal, outputs a first stage high-side driving signal to a control terminal of a high-side switch. As a result, a voltage of the control terminal of the high-side switch is pulled up to a first stage voltage from zero. Then, the control circuit outputs a second high-side control signal. A charge pump outputs a charging signal. The high-side driving circuit, according to the second high-side control signal and the charging signal, outputs a second stage high-side driving signal to the control terminal of the high-side switch. As a result, the voltage of the control terminal of the high-side switch is pulled up from the first stage voltage to a target voltage.

IPC Classes  ?

• H02M 1/08 - Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
• H02M 1/00 - Details of apparatus for conversion
• 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
• 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

Abstract

A motor commutation testing circuit is provided. When a commutation testing circuit determines that the motor commutation testing circuit enters a test mode, a selector circuit selects a commutation signal generating circuit and provides a simulated commutation signal generated by the commutation signal generating circuit to a control circuit. When the testing circuit determines that the motor commutation testing circuit enters a rotation detection mode, the selector circuit selects a motor rotation detecting circuit and provides a commutation signal of a motor that is detected by the motor rotation detecting circuit to the control circuit.

IPC Classes  ?

• G01R 31/34 - Testing dynamo-electric machines

Abstract

A light sensing method having a sensing order adjusting mechanism is provided. The method includes steps of: in a previous sensing cycle, sensing a first light signal that is emitted by both of an ambient light source and a light-emitting component and then is reflected by a tested object; in the previous sensing cycle, sensing a second light signal that is emitted by both of the ambient light source and the light-emitting component and then is reflected by the tested object; in the previous sensing cycle, sensing an ambient light signal emitted by only the ambient light source; and in a next sensing cycle, sensing the first light signal, the second light signal and the ambient light signal in an order different from that in the previous sensing cycle.

IPC Classes  ?

• G01J 1/16 - Photometry, e.g. photographic exposure meter by comparison with reference light or electric value using electric radiation detectors
• G01J 1/42 - Photometry, e.g. photographic exposure meter using electric radiation detectors
• G01J 1/08 - Arrangements of light sources specially adapted for photometry

Abstract

A light sensor having a voltage reversing mechanism is provided. A photoelectric component converts a first light signal into a first photocurrent. A capacitor is charged to a first voltage by the first photocurrent. A counter counts a first coarse count value according to the first voltage. The photoelectric component converts a second light signal into a second photocurrent. The capacitor is charged from a reversed first voltage to a second voltage by the second photocurrent. The counter counts a second coarse count value according to the second voltage. The counter counts a fine count value according to the second coarse count value. One of the first light signal and the second light signal is emitted by both of an ambient light source and a light-emitting component and then reflected by a tested object, and the other one of them is emitted by only the ambient light source.

IPC Classes  ?

• H01L 31/02 - SEMICONDUCTOR DEVICES NOT COVERED BY CLASS - Details thereof - Details
• G01J 1/44 - Electric circuits
• G01J 1/42 - Photometry, e.g. photographic exposure meter using electric radiation detectors
• H05B 47/11 - Controlling the light source in response to determined parameters by determining the brightness or colour temperature of ambient light

Abstract

An automatic control system for a phase angle of a motor is provided. A current detector circuit detects a current signal of the motor to output a current detected signal. A control circuit outputs a control signal according to the current detected signal indicating a time point at which the current signal reaches a zero value. A driver circuit outputs a driving signal according to the control signal. An output circuit operates to output a motor rotation adjusting signal to the motor to adjust a rotational state of the motor according to the driving signal.

IPC Classes  ?

• H02P 21/09 - Field phase angle calculation based on rotor voltage equation by adding slip frequency and speed proportional frequency
• H02P 23/14 - Estimation or adaptation of motor parameters, e.g. rotor time constant, flux, speed, current or voltage

Abstract

A motor driver having a startup adjusting mechanism is provided. A steady-state detector circuit detects data for driving a motor to stably rotate to output a steady-state detected signal. A startup waveform pattern circuit selects one of a plurality of startup waveform patterns to output a startup waveform pattern signal according to the steady-state detected signal. A startup waveform generator circuit outputs a startup waveform signal according to the startup waveform pattern signal. A motor controlling circuit controls a motor driving circuit to start up the motor according to the startup waveform signal.

IPC Classes  ?

• H02P 6/08 - Arrangements for controlling the speed or torque of a single motor
• H02K 11/33 - Drive circuits, e.g. power electronics
• H02P 6/20 - Arrangements for starting

Abstract

A motor driver having a high success rate starting mechanism is provided. A multi-segment slope pattern circuit connects a plurality of values of waveforms of a starting waveform signal to form a curve. The multi-segment slope pattern circuit determines a plurality of slopes respectively of a plurality of curve segments included in the curve according to a plurality of parameters related to a motor. The multi-segment slope pattern circuit outputs a multi-segment slope pattern signal according to the plurality of slopes of the plurality of curve segments. A startup signal generating circuit outputs a first startup waveform signal according to the multi-segment slope pattern signal. A motor controller circuit controls a motor driving circuit to start up the motor according to the first startup waveform signal.

IPC Classes  ?

• H02P 1/00 - Arrangements for starting electric motors or dynamo-electric converters
• H02P 1/16 - Arrangements for starting electric motors or dynamo-electric converters for starting dynamo-electric motors or dynamo-electric converters

Abstract

A switching charger for supplying stable power is provided. First input terminals of first and fourth operational amplifiers and a second input terminal of a second operational amplifier are connected to a battery. A second input terminal of the first operational amplifier is coupled to a reference voltage. A first input terminal of the second operational amplifier and a second input terminal of the fourth operational amplifier are connected to an inductor. A first input terminal of a third operational amplifier is connected to an input power source. A second input terminal of the third operational amplifier is connected to a system circuit. A first selector circuit is connected to output terminals of the third and fourth operational amplifiers. A second selector circuit is connected to output terminals of the first and second operational amplifiers and the first selector circuit.

IPC Classes  ?

• H02J 7/00 - Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
• 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
• H03F 3/45 - Differential amplifiers
• 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

Abstract

A motor controller circuit having a rotational speed locking mechanism is provided. Each time when a motor commutates, a first signal generating circuit resets a first waveform signal and a second signal generating circuit resets a second waveform signal. An output signal generating circuit outputs a waveform output signal according to the first waveform signal and the second waveform signal. A motor controller circuit outputs an on-time signal according to the waveform output signal. A motor driving circuit outputs a driving signal to the motor to drive the motor to rotate according to the on-time signal.

IPC Classes  ?

• G05B 1/06 - Comparing elements, i.e. elements for effecting comparison directly or indirectly between a desired value and existing or anticipated values electric with sensing of the position of the pointer of a measuring instrument continuous sensing
• H02P 6/15 - Controlling commutation time

Abstract

A closed-loop inductor current emulating circuit is provided. An emulation controller circuit generates an emulating signal according to a current flowing through a first terminal of a low-side switch of a power converter. When the emulation controller circuit outputs the emulating signal to a charging and discharging circuit, the charging and discharging circuit outputs a charging and discharging signal to a first terminal of a capacitor according to the emulating signal. When the emulation controller circuit outputs the emulating signal to a control terminal of the capacitor to adjust a capacitance of the capacitor, the charging and discharging circuit outputs a charging and discharging signal to the first terminal of the capacitor according to one or both of an input voltage and an output voltage of the power converter.

IPC Classes  ?

• 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
• 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

Abstract

A switching charger having fast dynamic response for transition of a load is provided. A first terminal of a high-side switch is coupled to an input voltage. A first terminal of a low-side switch is connected to a second terminal of the high-side switch. A first terminal of an inductor is connected to a node between the first terminal of the low-side switch and the second terminal of the high-side switch. A second terminal of the inductor is connected to a first terminal of a capacitor. A constant on-time circuit determines a duty cycle of an on-time signal according to the input voltage and an output voltage of a node between the second terminal of the inductor and the first terminal of the capacitor. A control circuit controls a driver circuit to drive the high-side switch and the low-side switch according to the on-time signal.

IPC Classes  ?

• 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
• H02M 1/00 - Details of apparatus for conversion

Abstract

A motor driver having an automatic phase switching mechanism is provided. After a three-phase motor is started up, a back electromotive force detecting circuit starts detecting a back electromotive force signal of each of three phases of the three-phase motor. A driving waveform generating circuit extracts parts of a plurality of first wave segment patterns from a first wave segment pattern signal as a plurality of first wave segments of a first waveform signal according to the back electromotive force signal. A motor controlling circuit controls the motor driving circuit to drive the three-phase motor to rotate normally according to the first waveform signal.

IPC Classes  ?

• H02P 6/18 - Circuit arrangements for detecting position without separate position detecting elements
• H02P 6/182 - Circuit arrangements for detecting position without separate position detecting elements using back-emf in windings
• H02P 21/22 - Current control, e.g. using a current control loop

Abstract

A power converter device is provided. A feedback circuit outputs a comparison output signal. A phase-locked loop circuit provides a phase-locked signal according to a reference clock signal and an inductor voltage in a power converter circuit. An on-time circuit provides an on-time comparing signal according to the phase-locked signal, an input voltage, the inductor voltage and an output voltage of the power converter circuit. A first input terminal of an SR flip-flop receives the on-time comparing signal from the on-time circuit. A second input terminal of the SR flip-flop receives the comparison output signal from the feedback circuit. A frequency control circuit, according to changes in the input voltage and the output voltage of the power converter circuit, instantaneously adjusts the on-time of the on-time signal such that an output terminal of the SR flip-flop outputs the adjusted on-time signal to the power converter circuit.

IPC Classes  ?

• 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 1/00 - Details of apparatus for conversion
• H03L 7/089 - Details of the phase-locked loop concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal the phase or frequency detector generating up-down pulses
• H03L 7/099 - Details of the phase-locked loop concerning mainly the controlled oscillator of the loop

Abstract

A power saving system of a battery charger is provided. A control terminal of a first transistor receives a wake-up signal. A counter is connected to a first terminal of the first transistor. The counter determines whether or not a working period of the wake-up signal from the first transistor is larger than a time threshold to output a counting signal. When the counting signal indicates that the working period of the wake-up signal is not larger than the time threshold, the counter and electronic components of an electronic device are turned off, thereby saving power of a battery. When the counting signal indicates that the working period of the wake-up signal is larger than the time threshold, the electronic device is switched from a power saving mode to a normal operation mode. In the normal operation mode, the battery can supply power to the electronic device.

IPC Classes  ?

• G06F 1/3212 - Monitoring battery levels, e.g. power saving mode being initiated when battery voltage goes below a certain level
• G06F 1/3287 - Power saving characterised by the action undertaken by switching off individual functional units in the computer system

Abstract

A switching charger for accurately sensing a small current is provided. First terminals of first transistors and a second transistor are coupled to a system voltage. Second terminals of the first transistors and a first input terminal of an operational amplifier are connected to a battery. A first terminal of a third transistor is connected to a second terminal of the second transistor and a second input terminal of the operational amplifier. A control terminal of the third transistor is connected to an output terminal of the operational amplifier. A first terminal of a fourth transistor is connected to a second terminal of the third transistor. First terminals of fifth transistors are coupled to an input voltage. Control terminals of the first transistors and the fifth transistors are connected to a control circuit. First terminals of sixth transistors are respectively connected to second terminals of the fifth transistors.

IPC Classes  ?

• H02J 7/00 - Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries

Abstract

A motor controller circuit having a stable speed controlling mechanism is provided. A duty cycle determining circuit determines duty cycles of the plurality of waveforms respectively of the first waveform signals within each of a plurality of time intervals to output a duty cycle instructing signal, according to a target working period corresponding to a target rotational speed. A signal generating circuit outputs the plurality of first waveform signals according to the duty cycle instructing signal, and outputs a second waveform signal. A motor control circuit outputs a plurality of on-time signals according to the plurality of first waveform signals and the second waveform signal. A motor driving circuit is controlled to operate and drive a motor to rotate according to the plurality of on-time signals.

IPC Classes  ?

• H02P 6/08 - Arrangements for controlling the speed or torque of a single motor
• H02P 27/08 - Arrangements or methods for the control of AC motors characterised by the kind of supply voltage using variable-frequency supply voltage, e.g. inverter or converter supply voltage using DC to AC converters or inverters with pulse width modulation
• 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
• 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

Abstract

A light sensor having a control complexity reducing mechanism is provided. When light is emitted to a photodiode by both of an ambient light source and a light-emitting component, a first coarse count value is counted by a counter and then is sampled and held by a first sample and hold circuit. When light is emitted to the photodiode by only the ambient light source, a second coarse count value is counted by the counter and then is sampled and held by a second sample and hold circuit. After the coarse count values are held, the counter performs a fine counting operation on light intensity of the light emitted by both of the ambient light source and the light-emitting component to generate a first fine count value, and on light intensity of the light emitted by only the ambient light source to generate a second fine count value.

IPC Classes  ?

• H01S 5/068 - Stabilisation of laser output parameters
• G01S 7/483 - Details of pulse systems
• H05B 45/12 - Controlling the intensity of the light using optical feedback
• H05B 45/34 - Voltage stabilisationMaintaining constant voltage
• H05B 45/345 - Current stabilisationMaintaining constant current

Abstract

A sensor is provided. A first terminal of a first current source and a first terminal of a first transistor are connected to a cathode of the photodiode. A control terminal of a second transistor is connected to an output terminal of a first operational amplifier. A first terminal of the second transistor is connected to a second terminal of the first transistor through a first current mirror circuit. A second terminal of the second transistor is connected to a second current source, a second input terminal of a second operational amplifier and a first terminal of a third transistor. A first input terminal of the second operational amplifier is connected to the first terminal of the first transistor. A control terminal of the third transistor is connected to an output terminal of the second operational amplifier.

IPC Classes  ?

• G01J 1/44 - Electric circuits
• H03F 3/45 - Differential amplifiers

Abstract

A power converter for providing a negative voltage is provided. A coupling controller circuit receives a digital control signal and provides a control signal. A reverse voltage converter circuit receives the control signal and provides a reverse voltage. The reverse voltage converter circuit includes a first switch, a second switch, a third switch, a fourth switch, a fifth switch, a seventh switch, an eighth switch, a coupling control signal triggering circuit and a pulse width modulation circuit. A first reverse logic circuit is connected to a second reverse logic circuit. The second reverse logic circuit is connected to the pulse width modulation circuit and is configured to provide a trigger signal to the pulse width modulation circuit. The pulse width modulation circuit turns on or off the reverse voltage converter circuit according to the trigger signal.

IPC Classes  ?

• 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 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
• H02M 1/00 - Details of apparatus for conversion

Abstract

A motor current protecting circuit is provided. A voltage calculating circuit determines whether or not each of low-side switches is fully turned on and then determines whether or not a voltage difference between a first terminal and a second terminal of each of the low-side switches being fully turned on is larger than or equal to a zero value. The voltage calculating circuit adds up the voltage differences each of which is larger than or equal to the zero value to output a voltage signal. A control circuit controls a driver circuit to switch the low-side switches and high-side switches according to the voltage signal.

IPC Classes  ?

• H02P 6/18 - Circuit arrangements for detecting position without separate position detecting elements
• H02P 29/024 - Detecting a fault condition, e.g. short circuit, locked rotor, open circuit or loss of load
• H02P 6/28 - Arrangements for controlling current
• H02P 6/182 - Circuit arrangements for detecting position without separate position detecting elements using back-emf in windings

Abstract

A power converter having a smooth transition control mechanism is provided. An oscillator circuit outputs a clock signal. A control circuit receives the clock signal from the oscillator circuit and outputs a control signal based on the clock signal. A driver circuit outputs a high-side conduction signal and a low-side conduction signal according to the control signal. A high-side switch is turned on or off according to the high-side conduction signal from the driver circuit. A low-side switch is turned on or off according to the low-side conduction signal from the driver circuit. The oscillator circuit receives the high-side conduction signal from the driver circuit. The oscillator circuit, according to the high-side conduction signal, determines whether or not the clock signal outputted to the control circuit needs to be adjusted.

IPC Classes  ?

• 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 1/00 - Details of apparatus for conversion
• H02M 1/08 - Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters

Abstract

A brake control system of a motor is provided. When a control circuit intends to brake the motor, the control circuit controls a driver circuit to turn off a first high-side switch and a second high-side switch, and to fully turn on the first low-side switch and the second low-side switch, for a period of time. Then, the control circuit controls the driver circuit to turn off one of the first low-side switch and the second low-side switch, and to continually turn on the other one of the first low-side switch and the second low-side switch, for a period of time. Then, the control circuit controls the driver circuit to turn off the other one of the first low-side switch and the second low-side switch, and to turn on the one of the first low-side switch and the second low-side switch, for a period of time.

IPC Classes  ?

• H02P 3/10 - Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter for stopping or slowing a DC motor by reversal of supply connections
• H02P 3/20 - Arrangements for stopping or slowing electric motors, generators, or dynamo-electric converters for stopping or slowing an individual dynamo-electric motor or dynamo-electric converter for stopping or slowing an AC motor by reversal of phase sequence of connections to the motor

Abstract

A power managing system and method are provided. When an under voltage lockout circuit determines that a common voltage of the power managing system is lower than a first lockout voltage, the under voltage lockout circuit outputs a first under voltage lockout signal for controlling one of a plurality of power converters that supplies a highest output voltage to rapidly reduce its output voltage to a zero value. Then, the under voltage lockout circuit outputs a second under voltage lockout signal for controlling another one of the power converters that supplies a lowest output voltage to gradually reduce its output voltage to the zero value.

IPC Classes  ?

• G05F 1/613 - Regulating voltage or current wherein the variable actually regulated by the final control device is DC using semiconductor devices in parallel with the load as final control devices

Abstract

A method of improving performance of an averager is provided. The method includes steps of: (a) multiplying a value of a (n−1)th piece of output data by a value “N” to calculate a temporary value; (b) determining whether or not a difference between an nth piece of input data and the (n−1)th piece of output data is larger than or smaller than a zero value, if yes, compensating the temporary value to obtain a correction value and performing step (c), if no, setting the correction value and performing step (c); (c) dividing the correction value by the value “N” to obtain a first value; (d) subtracting the first value from the correction value and adding up the correction value and the nth piece of input data to obtain a second value; and (e) dividing the second value by the value “N” to calculate an output value of the averager.

IPC Classes  ?

• G01J 1/42 - Photometry, e.g. photographic exposure meter using electric radiation detectors

Abstract

A power converter having a mechanism of dynamically controlling a minimum off time is provided. A high-side overcurrent protecting circuit determines whether or not a current flows from a high-side switch through a node between a second terminal of the high-side switch and a first terminal of a low-side switch toward an inductor, and determines whether or not the current is larger than a threshold to output a high-side overcurrent detected signal and a high-side overcurrent protecting signal. An off time adjusting circuit outputs a minimum off time signal to a driver circuit according to the high-side overcurrent protecting signal. The driver circuit determines that an overcurrent event occurs when the high-side switch is turned on according to the high-side overcurrent detected signal, and accordingly the driver circuit at least continually turns on the low-side switch during a longer minimum off time of the minimum off time signal.

IPC Classes  ?

• H02M 1/08 - Circuits specially adapted for the generation of control voltages for semiconductor devices incorporated in static converters
• H03K 17/0812 - Modifications for protecting switching circuit against overcurrent or overvoltage without feedback from the output circuit to the control circuit by measures taken in the control circuit
• H02M 1/32 - Means for protecting converters other than by automatic disconnection
• 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
• H03K 17/082 - Modifications for protecting switching circuit against overcurrent or overvoltage by feedback from the output to the control circuit
• H02M 1/00 - Details of apparatus for conversion

Abstract

A micro electro-mechanical film speaker device is provided. A signal input terminal of a signal amplifier circuit is connected to an external input circuit. A second output terminal of the signal amplifier circuit is connected to a negative terminal of a micro electro-mechanical film speaker. A first terminal of a first high-pass filter is connected to a first output terminal of the signal amplifier circuit. A second terminal of the first high-pass filter is connected to a positive terminal of the micro electro-mechanical film speaker. A first terminal of a second high-pass filter is connected to a feedback terminal of the signal amplifier circuit. A second terminal of the second high-pass filter is connected to the positive terminal of the micro electro-mechanical film speaker.

IPC Classes  ?

• H04R 19/02 - Loudspeakers
• H03F 3/45 - Differential amplifiers
• H04R 3/04 - Circuits for transducers for correcting frequency response

Abstract

A motor driver, a control method of the motor driver, and a motor driving system are provided. The motor driver includes a rotation information pin, an analog detecting circuit and a mode switching circuit. The rotation information pin is configured to receive a reference signal. The analog detecting circuit and the mode switching circuit are respectively and electrically connected to the rotation information pin and the analog detecting circuit. The analog detecting circuit determines whether the reference signal is an analog signal, and the motor driver is maintained in a master mode when the reference signal does not belong to the analog signal. The mode switching circuit determines whether the reference signal is a noise when the reference signal is the analog signal. The mode switching circuit switches the motor driver from the master mode to a slave mode when the reference signal is not the noise.

IPC Classes  ?

• H02P 6/16 - Circuit arrangements for detecting position
• G06F 13/32 - Handling requests for interconnection or transfer for access to input/output bus using combination of interrupt and burst mode transfer
• H02P 6/18 - Circuit arrangements for detecting position without separate position detecting elements