Abstract: A rectifier circuit can include a plurality of FETs arranged as a rectifier; and a start-up circuit applied to each of the plurality of FETs that turn each of the FETs off during a circuit startup period, wherein the start-up circuit provides a large impedance for low power dissipation during normal operation of the rectifier.

Abstract: A power converter may include the following elements: an input terminal for receiving an input voltage; an output terminal for providing an output voltage; a reference member for receiving a reference voltage; a first transistor electrically connected between the reference member and the input terminal; a second transistor electrically connected between the input terminal and the output terminal; a diode electrically connected in parallel with the second transistor; and a controller for selecting a first mode if the input voltage is greater than a first reference voltage level and for selecting a second mode if the input voltage has been less than a second reference voltage level for a reference time period. The first transistor and the diode may generate the output voltage in the first mode. The first transistor and the second transistor may generate the output voltage in the second mode.

Abstract: A converter apparatus includes: a converter for converting an AC voltage into a DC voltage; a DC link capacitor connected to the converter; a voltage detector for DC link voltage; a charging circuit for the DC link capacitor; a charging circuit controller for a switch connected with a charging resistor; a current detector for detecting a current of the converter; a turn-on controller for controlling the turning-on of power devices; a switch for connecting or disconnecting a power supply; a power supply monitor for monitoring a connection state of the power supply; a threshold value setter for setting a first or second threshold value; and a failure detector for determining the presence or absence of the failure of the power devices by a comparison between a current flowing upon turning on the power device, immediately after disconnection of the power supply, and the first or second threshold value.

Abstract: A rectifier cell includes a first cell branch and a second cell branch that extend in parallel between two opposite nodes receiving an a.c. signal. The first cell branch includes a first pair of transistors arranged with their current paths cascaded, with a first intermediate point in-between. The second cell branch includes a second pair of transistors arranged with their current paths cascaded, with a second intermediate point in-between. Each of the pairs of transistors includes a first transistor with a control terminal coupled to one of the two opposite nodes and a second transistor with a control terminal coupled to the other of the two opposite nodes. The bulks of the transistors receive voltages in order to vary the transistor threshold voltage by bringing the threshold voltage to a first value during forward conduction and to a second value during reverse conduction.

Abstract: An upper switching device and a lower switching device in an electric-power conversion unit are separately driven to close by an upper closing command signal and a lower closing command signal, respectively, generated by a calculation control unit; in response to occurrence of an excessive current abnormality or an excessive voltage abnormality, upper and lower selection circuits and a penetration prevention circuit provided in a signal path select an upper three-phase short-circuiting command signal or a lower three-phase short-circuiting command signal, or an upper-and-lower six-phase cutoff command signal, and a penetration prevention time prohibits upper and lower switching devices from being concurrently closed; when an excessive voltage abnormality occurs, the three-phase short-circuiting command signal is immediately generated, without an advanced cutoff operation being performed. As a result, excessive-voltage breakage of the circuit components is prevented.

Abstract: A flyback power converter includes a transformer having an auxiliary winding for generating an auxiliary voltage and providing a supply voltage on a supply node; a primary side controller circuit which is powered by the supply voltage from the supply node; and a high voltage (HV) start-up circuit. The HV start-up circuit is coupled to an high voltage signal through a HV input terminal and generates the supply voltage through a supply output terminal, wherein when the supply voltage does not exceed a start-up voltage threshold, a HV start-up switch conducts the HV input terminal and the supply output terminal to provide the supply voltage, and when the supply voltage exceeds a start-up voltage threshold, the HV start-up switch is OFF. The HV start-up circuit and the primary side controller circuit are packaged in two separate integrated circuit packages respectively.

Abstract: A bootstrap diode emulator circuit having a cathode and an anode includes a transistor device and a diodic device. The transistor device is arranged at the cathode of the bootstrap diode emulator circuit. The diodic device has a cathode connected to the transistor device and an anode that is the anode of the bootstrap diode emulator circuit.

Abstract: Various embodiments provide a resonant converter that includes a synchronous rectifier driver. The synchronous rectifier driver reduces voltage spikes on drains of transistors within the resonant converter by placing an active clamp between the drains of the transistors and an output terminal of the resonant converter. The active clamp reduces the voltage spikes by sinking current at the drains of the transistors to an output capacitor. By sinking the current to the output terminal, power loss is minimized and efficiency of the resonant converter is improved.

Abstract: A control circuit and method for a synchronous rectifier having a plurality of switches and receiving an AC input signal. The control method includes switching between controlling a first switch of the plurality of switches in response to a control signal for a second switch of the plurality of switches, controlling the first switch in response to a comparison between the AC input signal and a second signal.

Abstract: Systems, methods, and devices that employ self-driven gate-drive circuitry to facilitate controlling power switches to emulate a diode bridge to synchronously rectify a power signal are presented. A single-phase or multi-phase synchronous rectifier can comprise at least a first pair of switches of a first conducting path and a second pair of switches of a second conducting path that can form or emulate a diode bridge. To facilitate emulating turn-on and turn-off conditions of a diode, a switch can be turned on when voltage across the switch is forward-biased and turned off when switch current is reversed; also, there can be at least one current-controlled switch in each conducting path. Self-driven gate-drive circuitry employs low power components that can facilitate controlling respective switching of the at least first pair and second pair of switches, wherein switching of the switches is also controlled at start-up to emulate a diode bridge.

Abstract: The present disclosure relates to a synchronous rectification circuit. Operation states of four transistor switches in the synchronous rectification circuit are adjusted in accordance with a detected input voltage signal of the synchronous rectification circuit to achieve synchronous rectification. Moreover, the transistor switches in a rectifier bridge and a switching control circuit are all integrated into a single chip to have an increased integration level, a reduced chip size, and high efficiency. The present disclosure also relates to a switching power supply comprising the above synchronous rectification circuit.

Abstract: A synchronous bridge rectifier comprises a plurality of synchronously switched elements and a plurality of controller circuits, one for each of the synchronously switched elements. The synchronously switched elements may be field-effect transistors. Each controller circuit is configured to sense voltage across the corresponding synchronously switched element to control opening and closing of the synchronously switched element so as to rectify the alternating current input signal to form a direct current output signal.

Abstract: A driver includes a high-side driver transistor coupled between supply voltage and the gate drive nodes and provides a first charge current to a high side gate node of the high-side driver transistor until the gate drive node reaches a first gate drive threshold. Then a second charge current is provided to the high side gate node that is less than the first charge current. The gate drive node is limited to a first clamped threshold for a delay time. A gate drive current rise signal sets the value of the second charge current that charges the high side gate node and after the delay time the gate drive voltage is limited to a second clamped threshold greater than the first clamped threshold but less than the supply voltage. A gate drive programmable control signal sets the value of the second clamped threshold.

Abstract: A method and apparatus for driving a power stage is presented. In particular, the power stage is a half-bridge. In the method, there is a first power switch coupled to a second power switch via a switching node. The method steps include sensing a first control-terminal voltage of one of the first power switch and the second power switch and turning on the first power switch based on the first control-terminal voltage and sensing a second control-terminal voltage of one of the first power switch and the second power switch and turning on the second power switch based on the second control-terminal voltage. Optionally, the first power switch is turned on when the first control-terminal voltage has reached a first threshold value, and the second power switch is turned on when the second control-terminal voltage has reached a second threshold value.

Abstract: A wireless power transmitter comprises a bridge inverter including a first switch and a second switch coupled together with a first switching node therebetween, and a first capacitor coupled to the first switching node. The transmitter further includes control logic configured to control the first switch and the second switch according to an operating frequency to generate an AC power signal from a DC power signal, and a resonant tank operably coupled to the first switching node of the bridge inverter, the resonant tank configured to receive the AC power signal and generate an electromagnetic field responsive thereto. A method for operating the wireless power transmitter and a method for making the wireless power transmitter are also disclosed.

Abstract: A method is shown to create soft transition in selected topologies by controlling and designing a current pulse injection in front of the output choke to overwhelm the output current at a certain point in the switching cycle.

Abstract: An electrical assembly comprises a chain-link converter which includes a plurality of chain-link sub-modules. Each of the chain-link sub-modules is operable to provide a voltage source. Moreover, each of the chain-link sub-modules is provided with a visual indicator. The electrical assembly includes a controller which is configured to selectively operate each of the visual indicators to present a respective mapping visual signal. The electrical assembly additionally includes an image receiving device which is configured to receive the respective mapping visual signal. The electrical assembly also includes a processor which is operatively coupled to the image receiving device. The processor is configured to receive and process the respective mapping visual signal received by the image receiving device so as to create a map of a spatial arrangement of the chain-link sub-modules.

Abstract: A method and a system for controlling a rectifier can obtain a predicted switching interval. The method includes steps of: receiving frequency information and line information of a power generator, the line information including a switching point where a voltage or current crosses zero and a switching interval based on the frequency information; obtaining a predicted switching interval according to the frequency information and the line information, and obtaining a feedback signal according to two terminals of at least one component of the rectifier; and switching a switching signal of the rectifier within the predicted switching interval according to the feedback signal.

Abstract: A power conversion system with clamp mode switching includes a clamp conversion circuit, a switching circuit module, a PWM control module, and a feedback control module. The PWM control module stabilizes a feedback voltage when the feedback control module feeds the feedback voltage back to the switching circuit module and the PWM control module. The switching circuit module switches the clamp conversion circuit to operate in an active clamp mode or a non-active clamp mode.

Abstract: A piezoelectric positioning device (1) has at least one piezoelectric actuator (3) having a first connection contact (4) and a second connection contact (5). A control device (6) with digital/analog converters (12, 16) connected to the connection contacts (4, 5) is used to control the at least one piezoelectric actuator (3). In comparison with a coarse converter (12), a fine converter (16) has a comparatively smaller voltage range and lower voltage levels, with the result that a high degree of positioning accuracy can be achieved.

Abstract: A bridgeless power factor correction (PFC) circuit has first and second nodes, and first and second current paths connected between the first and second nodes. The first current path includes a first semiconductor device and a first switch element, and the second current path includes a second semiconductor device and a second switch element. One of the first and the second current paths further includes first and second sensing elements that are oppositely connected in series.

Abstract: The present invention discloses a cascade type power conversion device and a communication system for the same. Each phase of the cascade type power conversion device comprises a plurality of power modules connected in series and a communication system. The communication system comprises a plurality of low voltage communication units and a plurality of optical fibers. The plurality of low voltage communication units are connected in series and disposed in the plurality of power modules, respectively. And the plurality of optical fibers are connected between the low voltage communication units and a master control system of the cascade type power conversion device.

Abstract: One example includes a switching power converter circuit. The circuit includes a gate driver configured to generate at least one switching signal in response to a feedback signal. The circuit also includes a feedback stage configured to generate the feedback signal based on an amplitude of an output voltage at an output. The circuit further includes a power stage including at least one switch and a transformer. The at least one switch can be controlled via the respective at least one switching signal to provide a primary current through a primary winding of the transformer to induce a secondary current through a secondary winding of the transformer to generate the output voltage. The power stage further includes a self-driven synchronous rectifier stage coupled to the secondary winding to conduct the secondary current from a low voltage rail through the secondary winding.

Abstract: A power conversion apparatus and a synchronous rectification (SR) controller thereof are provided. The SR controller includes a first control circuit, a second control circuit, a pull-up circuit and a pull-down circuit. The first control circuit generates a pull-up control signal and a first pull-down signal according to a drain voltage of an SR transistor and a first voltage. The second control circuit compares the drain voltage with a second voltage to generate a second pull-down signal, and selects one of the first pull-down signal and the second pull-down signal as a pull-down control signal. The pull-up circuit and the pull-down circuit regulate a driving voltage on a gate terminal of the SR transistor in response to the pull-up control signal and the pull-down control signal respectively.

Abstract: An electronic device for testing of semiconductor components with test needles includes an electric power source, a plurality of test needles connected with the electric power source, a plurality of electric circuits, each one of the electric circuits connected upstream of one of the test needles, each one of the electric circuits including at least one circuit component which has low resistance in a range of electric currents and has high resistance above a given limit electric current, a control voltage source connected with each one of the electric circuits, and two DC/DC converter circuits connected between the control voltage source and the electric circuits.

Abstract: A charging control device includes a capacitor, a comparison unit and a switching unit. The capacitor is charged with a voltage converted from power received from a wireless power sending device. The comparison unit compares the voltage of the capacitor with a reference voltage, and generates an output signal according to the result of the comparison. The switching unit is connected to the front end of the capacitor and is switched by the output signal from the comparison unit so as to control whether to supply the converted voltage to a load terminal.

Abstract: A circuit for sampling current includes a current transformer, a reset resistor, a diode, a sampling switch, and a current sampling resistor. The current transformer includes a primary winding and a secondary winding. The reset resistor and two ends of the secondary winding are connected in parallel. The sampling switch, the diode, and the current sampling resistor are connected in series and then connected to two ends of the reset resistor in parallel. The primary winding is for connecting to a circuit to be sampled. When a current flows through the primary winding and the circuit to be sampled and the sampling switch is turned on at a negative AC half cycle, the circuit for sampling current samples the current flowing through the circuit to be sampled.

Abstract: A synchronous rectifier controller for controlling the on and off periods of a synchronous rectifier switch transistor in a switching power converter. In particular, the synchronous rectifier controller is configured to adaptively enable and disable a deglitch filter for filtering a turn-on signal for the synchronous rectifier switch transistor. In this fashion, the synchronous rectifier switch transistor may be switched on more rapidly during periods when the deglitch filter is disabled for greater efficiency yet the switching power converter is protected by the deglitch filter when it is not disabled.

Abstract: This application relates to a power converter circuit for converting a supply voltage received at an input node and providing, at an output node, a current at the converted supply voltage. The power converter circuit contains a DC-DC converter circuit for generating the current at the output node under control of a control signal, a current sensing circuit for sensing a current indicative of a current at the input node, a voltage adjustment circuit for sensing a voltage indicative of the supply voltage and generating an adjusted voltage on the basis of the sensed voltage and the sensed current, and an error amplifier stage for generating the control signal on the basis of the adjusted voltage and a reference voltage. The application further relates to a method of operating such power converter circuit.

Abstract: The present disclosure discloses a power conversion system and a method for suppressing the common-mode voltage. The power conversion system comprises a grid-side converter, a motor-side converter, a bus capacitor, a first reactor, a second reactor, and a third reactor. The bus capacitor is electrically connected between the grid-side converter and the motor-side converter. The first reactor includes a first terminal and a second terminal, wherein the first terminal is electrically connected to the motor-side converter. The second reactor includes a first terminal and a second terminal, wherein the first terminal is electrically connected to the second terminal of the first reactor and the second terminal of the second reactor is electrically connected to a motor. The third reactor includes a first terminal and a second terminal, wherein the first terminal is electrically connected to a grid and the second terminal is electrically connected to the grid-side converter.

Abstract: A power converter with an isolated topology may include a primary side and a secondary side. The secondary side includes a self-powered synchronous rectifier. The synchronous rectifier includes a synchronous rectifier transistor having at least a drain and a gate, a voltage regulator having at least an input that is coupled to the drain of the synchronous rectifier transistor, and an auxiliary transistor having at least a drain that is coupled to the drain of the synchronous rectifier transistor. The auxiliary transistor is on a same die as the synchronous rectifier transistor. The synchronous rectifier also includes a clamping device having at least an output that is coupled to the gate of the auxiliary transistor, and a gate driver circuit having at least: a power supply input that is coupled to the output of the voltage regulator, and an output that is coupled to a gate of the synchronous rectifier transistor.

Abstract: The present disclosure relates to power supplies and control methods for power supplies. Example power supplies include an output terminal, a transformer having a secondary winding including a first terminal and a second terminal, first and second diodes coupled between the output terminal and the first and second terminals, respectively, first and second switches coupled between the output terminal and the first and second terminals, respectively, and a controller coupled to the first switch and the second switch. The controller is configured to control the power supply in an asynchronous mode when output current is below a defined threshold so current flows to the output terminal through the first diode and the second diode, and to control the power supply in a synchronous mode when output current is above the defined threshold so current flows to the output terminal through the first switch and the second switch.

Abstract: A switching power supply device that switches setting of an output voltage based on an external signal according to one or more embodiments includes: a transformer including a primary winding and n secondary windings; n synchronous rectification elements provided, corresponding to the n secondary windings; and n?1 switch elements that switch the secondary windings. Each of the n?1 switch elements is kept on or off according to a high or low voltage value out of set voltages of the output voltage, and all or any of the n synchronous rectification elements are selected to synchronously rectify pulse voltage of the secondary windings, and when operation with a high set value of the output voltage stops, a synchronous rectification element used to output the high set value performs switching operation until the output voltage goes down to the low voltage value of the set voltages of the output voltage.

Abstract: Switched mode power supply (SMPS) with a control circuitry and method of operating such a SMPS are described. The control circuitry includes a first driver to drive an input switch in response to a driving signal, a pulse circuit to generate a pulse signal in response to the driving signal, a timer circuit to generate a delayed signal in response to the pulse signal and a second driver to drive to the output switch in response to the delayed signal.

Abstract: A Low Forward Voltage Rectifier (LFVR) circuit includes a bipolar transistor, a parallel diode, and a capacitive current splitting network. The LFVR circuit, when it is performing a rectifying function, conducts the forward current from a first node to a second node provided that the voltage from the first node to the second node is adequately positive. The capacitive current splitting network causes a portion of the forward current to be a base current of the bipolar transistor, thereby biasing the transistor so that the forward current experiences a low forward voltage drop across the transistor. The LFVR circuit sees use in as a rectifier in many different types of switching power converters, including in flyback, Cuk, SEPIC, boost, buck-boost, PFC, half-bridge resonant, and full-bridge resonant converters. Due to the low forward voltage drop across the LFVR, converter efficiency is improved.

Abstract: Systems and methods for rectifying and regulating an input voltage are disclosed. A biasing circuit is configured to generate a biasing voltage greater than the maximum value of the input voltage minus a forward bias voltage of a p-n junction diode and apply the biasing voltage to the body terminal of a MOSFET. The biasing circuit may generate the biasing voltage by rectifying the input voltage. A control circuit is configured to generate a gate voltage based on the rectified and regulated output voltage and apply the gate voltage to the gate terminal of the MOSFET.

Abstract: A solar module device with the master circuit generates the timing signal to synchronize each of the synchronized half wave rectified DC waveform generated by each of the slave circuits to a grid AC signal or a reference AC signal to allow the DC-AC power conversion of a plurality of solar cell groups provided in a module in an on-grid application and an off-grid application.

Abstract: An electric power conversion circuit comprises U-phase and V-phase switching circuits, a transformer, and an ?-phase switching circuit. A primary winding of a transformer is connected between the U-phase switching circuit and the V-phase switching circuit, and both ends of a secondary winding are connected to the ?-phase switching circuit. The ?-phase switching circuit comprises positive and negative terminals, a half bridge including and two switching devices, and a voltage divider circuit. The half bridge is provided between the positive terminal and the negative terminal, and a common connection point between the two switching devices is connected to one end of the secondary winding. A voltage divider output point of the voltage divider circuit is connected to the other end of the secondary winding.

Abstract: Control method and device for I-type three-level circuit are disclosed, which can realize zero-voltage turn on of switching tube of high-frequency bridge arm, reduce circuit loss and improve circuit efficiency. The control method includes: detecting a current of an inductor connected with each of high-frequency arm bridges in operation state in the circuit; in a positive half cycle of AC connection terminal voltage of the circuit, when a freewheeling switching tube of the high-frequency arm bridge connected with the inductor is in ON state and a main switching tube is in OFF state, controlling the freewheeling switching tube to keep in ON state and the main switching tube to keep in OFF state if the current does not reach a preset negative current, and controlling the freewheeling switching tube to be turned off and the main switching tube to be turned on if the current reaches the preset negative current.

Abstract: A switching converter includes a synchronous rectifier and a synchronous rectifier driver that controls conduction of the synchronous rectifier. The synchronous rectifier driver turns OFF the synchronous rectifier in response to a turn-off trigger. The synchronous rectifier driver prevents the turn-off trigger from turning OFF the synchronous rectifier during a turn-off trigger blanking time that is adaptively set based on a conduction time of the synchronous rectifier.

Abstract: A switching power supply device includes a power factor improvement circuit, a phase-shifted full bridge type DC/DC converter that is arranged in a rear stage of the power factor improvement circuit and has a full-bridge type switching circuit, an output current detecting circuit for detecting an output current to be supplied to a load, an output voltage detecting circuit for detecting an output voltage to be supplied to the load, and a power factor improvement circuit output voltage detecting circuit for detecting a power factor improvement circuit output voltage, which is input from the power factor improvement circuit to the DC/DC converter.

Abstract: Some embodiments are directed to an AC/DC converter comprising a first AC terminal for connection to a first AC circuit terminal, a neutral line terminal for connection to a neutral AC circuit terminal, a common node, a first AC side active bridge coupled between the first AC terminal and the common node, and a neutral voltage lift capacitor coupled between the neutral line terminal and the common node. The converter comprises first and second DC terminals, and a capacitor between the first and second terminals. A DC-side active bridge is coupled between the first and second terminals. An inductor is coupled between switchable nodes of the first AC side active bridge and the DC side active bridge. A controller is arranged to control the first AC side active bridge and the DC-side active bridge so to alternate voltage across the first AC terminal and the neutral line terminal.

Abstract: A wireless power enabled apparatus may comprise a wireless power receiver that includes a receive coil configured to generate an AC signal responsive an electromagnetic field, a rectifier including a plurality of switches configured to receive the AC signal and generate an output power signal, and control logic configured to control the plurality of switches to cause the rectifier to modulate the output power signal. The control logic may be configured to control the plurality of switches within the rectifier to have an overlap delay that modulates at least one parameter of the wireless power receiver. A method of operating a receiver side of a wireless power transfer system comprises generating an output power signal including a rectified voltage and a rectified current responsive to receiving a wireless power signal, and controlling a rectifier according to at least one mode including a power modulation mode modulating the output power signal.

Abstract: An electrical power conversion system includes an alternating current (AC)-to-direct current (DC) power converter that is configured to convert power between AC power and DC power. The AC-to-DC power converter includes switching legs that each connect to a phase of the AC power. Each of the switching legs includes two electronic devices connected in series with one another between a positive DC bus terminal and a negative DC bus terminal. The electrical power conversion system also includes a DC-to-DC power converter that is configured to convert power between the DC bus power and DC terminal power via a positive DC terminal and a negative DC terminal. The DC-to-DC power converter is configured to control a differential voltage between the positive and negative DC terminals and a common-mode voltage that is between a neutral of the AC power and each of the positive and negative DC terminals.

Abstract: An energy storage system (ESS) for an electrical system includes an energy storage, and a converter interface arranged for connecting the energy storage to the electrical system. The converter interface includes a modular multilevel converter in which each phase leg includes a plurality of series connected cells of which at least one is a half-bridge cell and at least one is a full-bridge cell.

Abstract: A switch mode power supply includes an input, an output, and a power converter coupled between the input and the output. The power converter includes a transformer having a primary side and a secondary side, and a clamping circuit. The clamping circuit has a switching device coupled to the primary side of the transformer. The power supply further includes a control circuit coupled to the switching device. The control circuit includes at least one isolation component. The control circuit is configured to receive a signal from the secondary side of the transformer via the at least one isolation component, and control the switching device coupled to the primary side of the transformer in response to the signal received from the secondary side of the transformer via the at least one isolation component. Other example power supplies, power converters, control circuits, etc. are also disclosed.

Abstract: A DC-AC converter is disclosed. The DC-AC converter generates an output AC signal, and has an input DC-AC converter which generates a first AC signal, a transformer device which receives the first AC signal and generates a second AC signal, and a first bidirectional switch which selectively connects a first transformer output terminal and a first output terminal. The DC-AC converter also has a first capacitor which powers the first bidirectional switch, a first charging circuit which charges the first capacitor, and a second bidirectional which selectively conduct connects a second transformer output terminal and a second output terminal. The DC-AC converter also has a second capacitor which powers the second bidirectional switch, and a second charging circuit which charges the second capacitor. Each of the bidirectional switches includes series connected transistors between first and second input/output terminals, and a transistor driver which drives the transistors.

Abstract: A regulation circuit of a power converter for cable compensation according to the present invention comprises a signal generator generating a compensation signal in accordance with a synchronous rectifying signal. An error amplifier has a reference signal for generating a feedback signal in accordance with an output voltage of the power converter. The compensation signal is coupled to program the reference signal. The feedback signal is coupled to generate a switching signal for regulating an output of the power converter. The regulation circuit of the present invention compensates the output voltage without a shunt resistor to sense the output current of the power converter for reducing power loss.

Abstract: A rectifier includes a first diode, a second diode, a first switch and a second switch. Each of the first switch and the second switch includes a controlling pole, a first connecting pole and a second connecting pole. A positive pole of the first diode, the second connecting pole of the first switch, and the controlling pole of the second switch are coupled to a first pole of an alternating current (AC) power. A positive pole of the second diode, the second connecting pole of the second switch, and the controlling pole of the first switch are coupled to a second pole of the AC power. A negative pole of the first diode and a negative pole of the second pole are coupled to an output pole, and the first connecting pole of the first switch and the first connecting pole of the second switch are grounded.

Abstract: In one example, a circuit for controlling synchronous rectification includes a first current compensation module, a second current compensation module, and a control module. The first current compensation module is configured to provide a first current into parasitic capacitance at a drain pin when a drain of a synchronous rectifier draws current from the parasitic capacitance. The drain pin is coupled to the drain of the synchronous rectifier via a resistor. The first current compensation module is further configured to generate a triggering signal using the first current. The second current compensation module is configured to draw a second current from the parasitic capacitance when the drain of the synchronous rectifier provides current into the parasitic capacitance and generate an arming signal using the second current. The control module is configured to activate the synchronous rectifier using the triggering signal and the arming signal.