Abstract: Systems, methods, and computer-readable mediums include detecting and eliminating a three-phase without neutral short-circuit in a load supplied by a power converter. After detecting the short circuit, the current at an output conductor for one of the three-phases is stopped and then resumed after a sufficient amount of current causes a downstream protection device of the faulty load to trip.

Abstract: A microinverter inverter is provided and comprises an output comprising a four-way connector comprising three power input/output connecters and a voltage monitoring and power line communications connector. The output is configured to connect to an AC cable comprising a rotatable four-way connector comprising three phase wires and a neutral wire which allows the microinverter to operate in at least one of a three-phase grid-tied mode of operation, a three-phase off-grid neutral-forming mode of operation, a two-phase grid-tied mode of operation, a two-phase off-grid neutral-forming mode of operation, or a split-phase and single-phase grid tied and off-grid neutral-forming mode of operation when the microinverter is connected to the AC cable.

Abstract: A power conversion system includes plural power conversion apparatuses and a server connected to each of the plural power conversion apparatuses. Each of the plural power conversion apparatuses includes a power conversion circuit interconnected with a power system, a calculating unit configured to calculate, based on an output current and an output voltage of the power conversion circuit, at least one information of reactive power and a reactive current output by the power conversion circuit, a storing unit configured to accumulate, in a storage device, time-series reactive power information which is information associating time and the at least one information calculated by the calculating unit, and a communication interface configured to transmit the time-series reactive power information stored in the storage device to the server. The server is constructed to collect the time-series reactive power information of each of the plural power conversion apparatuses via the communication interface.

Abstract: A power converting device includes a totem pole type power factor improving circuit and a control circuit. The totem pole type power factor improving circuit includes a coil connected to a first terminal of an AC power supply, a first half-wave switch in which a source terminal is connected to the coil via a first current detector, a second half-wave switch in which a drain terminal is connected to the coil via a second current detector, a first diode in which a cathode is connected to a drain terminal of the first half-wave switch and an anode is connected to a second terminal of the AC power supply, a second diode in which an anode is connected to a source terminal of the second half-wave switch and a cathode is connected to the second terminal of the AC power supply, and a smoothing capacitor connected between the cathode of the first diode and the anode of the second diode.

Abstract: A method and apparatus for an active discharge of an X-capacitor are provided. A sensor signal, indicative of a voltage at the capacitor, is compared with a lower and upper threshold values. A first value of a smaller one of the lower and upper threshold values is increased to a first new value that is greater than a second value of a larger one of the lower and upper threshold values in response to a first control signal indicating the sensor signal is greater than the upper and lower threshold values. A third value of the greater one of the lower and upper threshold values is decreased to a second new value that is less than the value of the larger one of the lower and upper threshold values in response to a second control signal indicating the sensor signal is less than the upper and lower threshold values.

Abstract: A system is described. The system includes a control transistor, a voltage source, a feedback node connected between a drain of the control transistor and the voltage source, a plurality of resistors connected between the voltage source and ground, and a control node connected to a gate of the control transistor. The resistors include a first series-connected set of resistors associated with the control transistor being biased and a second series-connected set of resistors associated with the control transistor being unbiased. During a startup period, the control node is configured to bias the control transistor to select the first series-connected set of resistors, thereby increasing a voltage level of the voltage source to a boosted VCC voltage. After the startup period, the control node is configured to unbias the control transistor to select the second series-connected set of resistors, thereby decreasing the boosted VCC voltage to a normal VCC voltage.

Abstract: A power converter converts a medium-voltage output from a solar module to an appropriate voltage to power a solar tracker system. The power converter includes a voltage divider having at least two legs, a first semiconductor switch subassembly coupled in parallel with a first leg of the voltage divider, and a second semiconductor switch subassembly coupled in parallel with a second leg of the voltage divider. The power converter may be a unidirectional or a bidirectional power converter. In implementations, the signals for driving the semiconductor switches of the first and second semiconductor switch subassemblies may be shifted out of phase from each other. In implementations, if the bus voltages to the semiconductor switches are not balanced, the pulse width of the driving signal of the semiconductor switch supplied with the higher bus voltage is decreased for at least one cycle.

Abstract: An inverter circuit control method and a device thereof are provided. In the control method, after determining a DC bus voltage and an output leakage current of a target inverter circuit, a modulation harmonic wave to be injected into a SPWM signal is adjusted according to the DC bus voltage or the output leakage current if it is determined according to the DC bus voltage that the target inverter circuit satisfies a preset modulation condition, such that total harmonic distortion of a current of the target inverter circuit is within a preset range. The DC bus voltage and the output leakage current of the target inverter circuit are used as references for adjusting the modulation harmonic wave, ensuring total harmonic distortion of the current of the target inverter circuit to be within a preset range.

Abstract: A voltage-regulating drive circuit for an LED luminaire is disclosed. The drive circuit includes one or several series of LED light engines. A voltage source with a regulator is connected to the series of LED light engines to forward-bias the light engines. The circuit also includes a driver integrated circuit, which may drive the series of LED light engines using, e.g., pulse-width modulation (PWM). The circuit also includes a feedback circuit connected to the cathode end of the series of LED light engines. The feedback circuit receives a remainder voltage and creates a feedback output signal that upregulates or downregulates the regulator of the voltage source to keep a minimum operating voltage on the driver integrated circuit and to compensate for variations in forward voltages among LED light engines in the series.

Abstract: Provided is an arrangement for controlling a converter of a power generation system, for example, a wind turbine, the converter being connected to a connection point to a utility grid, the arrangement including: a measurement section adapted to provide measurement values indicative of values of current and voltage at the connection point, a main converter controller adapted to receive the measurement values and to generate a main converter control signal based on the measurement values, an active filter system adapted to receive the measurement values and to generate an active filter control signal based on the measurement values, an addition element adapted to add the main converter control signal and the active filter control signal and to supply the sum signal as a control signal to the converter.

Abstract: An induction heating device includes a working coil, an inverter including a first switching element and a second switching element that are configured to perform a switching operation and to apply a resonance current to the working coil, a snubber capacitor including a first snubber capacitor connected to the first switching element, and a second snubber capacitor connected to the second switching element, a phase detector configured to detect a phase difference between the resonance current applied to the working coil and a switching voltage applied to the second switching element, and a controller configured to receive, from the phase detector, phase information including the phase difference, provide the inverter with a switching signal to thereby control the switching operation, and adjust an operating frequency of the switching signal based on the phase information to thereby control an output of the working coil.

Abstract: A power converter is provided. A power communication module controls a secondary side voltage control circuit to output a voltage control signal according to a connection state signal. A primary side switch control circuit adjusts an operating frequency of switching a conduction state of an adjustment switch according to the voltage control signal, so as to adjust an output voltage of a transformer circuit.

Abstract: A power supply time sequence control circuit and a control method thereof, a display driver circuit, and a display device. The power supply time sequence control circuit includes: a delay control sub-circuit, a delay detection sub-circuit and an output sub-circuit. The delay control sub-circuit is configured to receive a first voltage outputted by the first input voltage terminal and to output the first voltage after delaying for a pre-determined time period; the delay detection sub-circuit is configured to send a trigger signal to the output sub-circuit upon the first voltage being received by the delay detection sub-circuit; the output sub-circuit is configured to be in an on-state in response to the trigger signal, so as to output the first voltage provided by the first input voltage terminal to the signal output terminal, and to enable the signal output terminal to output the first voltage.

Abstract: A method for controlling an inverter-based resource having an asynchronous machine connected to a power grid to provide grid-forming control of the inverter-based resource includes coupling at least one additional device to terminals of a first converter of the inverter-based resource. Further, the method includes emulating, via a controller, at least one of the at least one additional device or the first converter as a first virtual synchronous machine. Moreover, the method includes coordinating, via the controller, operation of the first virtual synchronous machine and a second converter of the inverter-based resource using a vector-control approach to control at least one of voltage and frequency at a point of interconnection between the inverter-based resource and the power grid in a closed loop manner.

Abstract: An active clamp switching power converter circuit includes a primary-side sensing circuit that generates a sensed voltage based on an auxiliary winding voltage of an auxiliary winding around the core having a same polarity as the primary winding. Based on the sensed voltage, a controller controls switching of a power switch coupled to the primary winding to control current through the primary winding and controls switching of an active clamp switch to control leakage current when the power switch is turned off. The controller regulates timing of the switching to turn on the power switch based on timing of a zero voltage switching condition for power efficient operation.

Abstract: A power converter includes a first and a second transformers having different auxiliary winding voltage levels. A bias voltage supply circuit generates a bias supply voltage of an integrated circuit used to control the power converter, and includes a first and a second bias supply branches jointly coupled to a supply capacitor to provide the bias supply voltage. When the bias supply voltage is higher than a threshold voltage, the first bias supply branch to receive the one with lower level of the two auxiliary winding voltages is switched from a deactivation state to an activation state to provide the bias supply voltage, when the bias supply voltage is less than the threshold voltage, the second bias supply branch to receive the one with larger level of the two auxiliary winding voltages is switched from the deactivation state to the activation state to provide the bias supply voltage.

Abstract: This voltage imbalance assessment method is for a power conversion device comprising a forward converter for rectifying the voltage of a three-phase AC power supply, a smoothing capacitor for smoothing the rectified voltage, a detection unit for detecting the smoothed voltage, and a control unit. The control unit: uses the detected voltage to generate data indicating frequency components; compares, in the data indicating frequency components, the magnitude of the component that is four times the power supply frequency with the magnitude of the component that is six times the power supply frequency; and assesses the voltage imbalance of the three-phase AC power supply on the basis of the comparison.

Abstract: Provided is a light source apparatus including semiconductor light sources and a current detection resistor connected in series, a power source circuit that allows current to flow thereto, a current detection circuit that detects current flowing to the current detection resistor and outputs a current detection signal, a control circuit that controls the power source circuit such that a voltage of the current detection signal approaches a target value, a bypass circuit connected in parallel to the semiconductor light sources, and including a clamp element having a clamp voltage higher than a maximum voltage during operation of the semiconductor light sources and a bypass resistor connected in series to the clamp element, and allowing current to flow when an open fault occurs in the semiconductor light sources, and detection circuits that respectively detect an open fault in the semiconductor light sources based on an end-to-end voltage of the bypass resistors.

Abstract: A circuit device has a power converter, which includes power semiconductor switches and a capacitor which is connected to a first and a second intermediate circuit conductor in an electrically conductive manner, and having a capacitor discharge device for the electrical discharging of the capacitor. The capacitor discharge device includes an actuation device, an electrical discharge resistor and a first semiconductor switch having a first and a second load current terminal, and having a control terminal. The first load current terminal of the first semiconductor switch is connected to the first intermediate circuit conductor via the discharge resistor, and the second load current terminal of the first semiconductor switch connects to the second intermediate circuit conductor.

Abstract: A resonance oscillator circuit is provided to include first and second oscillators. The first oscillator includes a first LC resonator circuit and an amplifier element, and oscillates by shifting a phase of an output voltage with a predetermined phase difference and feeding the output voltage back to the amplifier element. The second oscillator oscillates by generating a gate signal, which has a frequency identical to that of the output voltage, and drives the amplifier element, by shifting the phase of the output voltage with the phase difference and feeding the gate signal back to an input terminal of the amplifier element, by using the amplifier element as a switching element and using the first oscillator as a feedback circuit. The phase difference is a value substantially independent of an inductance of the first LC resonator circuit and a load, to which the output voltage is applied.

Abstract: Some embodiments provide a system to protect an electric vehicle charging infrastructure. An electric vehicle charging site may receive Alternating Current (“AC”) power from a power grid and provides Direct Current (“DC”) power to electric vehicles. A sensor spoof observer and controller may receive information from at least two AC current sensors, wherein the observer calculates a grid voltage disturbance using a structure based on an AC filter dynamic model. A system stability assurance platform may: (i) monitor current and voltage to detect resonance, (ii) identify impedance associated with a detected resonance, and (iii) apply a result of an analysis of the identified impedance to an adaptive damping control algorithm. A user interface platform may then provide information about a component of the charging infrastructure being cyber-attacked to a distribution system operator via a graphical user interface display.

Abstract: A drive circuit for an LED luminaire is disclosed. The drive circuit includes one or several series of LED light engines. A voltage source with a regulator is connected to the series of LED light engines to forward-bias the light engines. The circuit also includes an integrated circuit driver, which may drive the series of LED light engines using, e.g., pulse-width modulation (PWM). The circuit also includes a feedback circuit connected to the cathode end of the series of LED light engines. The feedback circuit receives a remainder voltage and creates a feedback output signal that upregulates or downregulates the regulator of the voltage source to keep a minimum operating voltage on the integrated circuit driver and also to compensate for variations in forward voltages among LED light engines in the series. A switching element, such as a bipolar junction transistor, protects the driver from high voltages.

Abstract: An arc fault detection circuit interruption (AFCI) device includes a high frequency arc noise sensor and an arc fault detection circuit for sensing a high frequency arc noise. The high frequency arc noise sensor is disposed across a hot conductor and a neutral conductor and includes a surge protection device and a surge protection circuit such that the surge protection device protects against a first voltage surge in a first range of thousands to hundreds volts and the surge protection circuit protects against a second voltage surge in a second range of hundreds to few volts. The arc fault detection circuit is coupled in series with the high frequency arc noise sensor. The arc fault detection circuit is coupled to a series combination of a trip solenoid or electromagnet and a silicone-controlled rectifier disposed across the hot conductor and the neutral conductor.

Abstract: A conversion circuit is disclosed. In the conversion circuit, an input terminal includes a positive direct current bus terminal and a negative direct current bus terminal, and an output terminal includes an alternating current output end; a first switch unit includes a flying clamping capacitor and a first converter bridge arm; a second switch unit includes a second converter bridge arm; an output end of the first switch unit and the second switch unit is connected to the alternating current output end; and the first switch unit and the second switch unit are connected to a control module, and switch under control of the control module, so that the conversion circuit converts between a direct current voltage and an alternating current voltage, to output a required alternating current voltage.

Abstract: A method for pulse-width modulation of a power converter (10) and a power converter (10) are presented. The method comprises determining (110) a modulation index, selecting (120), based on the modulation index, a modulation technique from a plurality of pre-deter-mined modulation techniques, and modulating (130) an output (16) of the power converter (10) by utilizing the selected modulation technique.

Abstract: In a method for operating an energy converter that couples a first supply network to a second supply network by converting electrical energy via a switch element, the switch element is operated in a switching operation and a supply-network current for one of the supply networks is adjusted depending on a comparison of the supply-network current with a reference current. In a first operating mode for the switching operation, an electrical voltage of one of the supply networks is set by a PWM method on the basis of the comparison, and a second operating mode is provided, in which the switch element is switched when, during the comparison, a difference between the supply-network current and the reference current is greater than a first predefined relative switching value and/or is smaller than a second predefined relative switching value, wherein the first and second operating modes are alternated during the operation.

Abstract: A wireless power transfer system is disclosed. The wireless power transfer system includes a first converting unit for converting a first DC voltage of an input power to a first AC voltage, a contactless power transfer unit for transmitting the input power having the first AC voltage, and a second converting unit for transmitting the power having a second DC voltage corresponding to the first AC voltage to an electric load. Additionally, the wireless power transfer system includes an active voltage tuning unit for controlling the second DC voltage based on a difference between the second DC voltage and a reference voltage and at least one among a difference between the resonant frequency and the constant operating frequency and a difference between a phase angle of the first AC voltage and a phase angle of an AC current.

Abstract: An IPT primary or secondary circuit includes a converter connected to a primary energy source and a compensation network. A supplementary energy source is connected to the compensation network and the converter transfers energy between the primary energy source or another IPT primary or secondary circuit and the supplementary energy source.

Abstract: A switching circuit comprising a transistor and a drive component both for controlling the transistor and also for limiting the power supply current supplied to a load, the drive component being arranged both to receive a control voltage and also: when the control voltage is a disconnection signal, to generate a drive voltage that causes the transistor to occupy a non-conductive state; when the control voltage is a connection signal and the power supply current cannot reach a predefined current threshold, to generate a drive voltage that causes the transistor to occupy saturated conditions; and when the control voltage is a connection signal and the power supply current can reach a predefined current threshold, to generate a drive voltage that causes the transistor to occupy linear conditions, such that the power supply current is regulated so that it does not exceed the predefined current threshold.

Abstract: Provided is a filter device to be connected between an AC power source (1) and a PWM converter (2), which includes a first AC reactor (3), a second AC reactor (4) that is connected between the PWM converter (2) and the first AC reactor (3), a filter capacitor (5) whose one end is connected to a connecting portion (9) between the first AC reactor (3) and the second AC reactor (4), and a housing (15) having a cooling air inlet (16) and a cooling air outlet (17) and containing the first AC reactor (3) and the second AC reactor (4), wherein the first AC reactor (3) is disposed upwind of the second AC reactor (4).

Abstract: Unique systems, methods, techniques and apparatuses of a distribution system are disclosed. One exemplary embodiment is an alternating current (AC) distribution system including a first substation including a first transformer and a protective device; a first distribution network portion coupled to the first transformer; a second substation; a second distribution network portion; a DC interconnection system coupled between the first distribution network portion and the second distribution network portion; and a control system. The control system is structured to detect a fault in the first transformer or the transmission network, isolate the first distribution network from the fault, determine a set point of the DC interconnection system, and operate the DC interconnection system using the set point so as to transfer a portion of the MVAC from the second distribution network portion to the first distribution network portion.

Abstract: An output current synthesizer that synthesizes output currents output from a plurality of power inverter circuits converting direct current power to alternating current power and outputs the synthesized output currents as synthesized current having a predetermined frequency, the output current synthesizer includes a pair of conductors which is provided with each of the power inverter circuits and to which the output currents of the power inverter circuits flow, a reactor which is provided on each of the pairs of conductors and generates magnetic flux corresponding to a difference between values of currents flowing to the pairs of conductors to reduce the difference between the values of currents, a pair of conductive members to which the pairs of conductors are connected in parallel, and a pair of output terminals which is provided on the pair of conductive members and output the synthesized currents.

Abstract: A PWM power supply controllers are typically applied for a single output power supply. For specific applications, like LCD TV's, dual outputs are required. As a preference to only regulate one output, the performance of the system suffers when the outputs are unequally loaded. The disclosure describes a way to balance the outputs, such that when the output are unequally loaded, additional outputs are still accurately regulated.

Abstract: Provided is a light source apparatus including semiconductor light sources and a current detection resistor connected in series, a power source circuit that allows current to flow thereto, a current detection circuit that detects current flowing to the current detection resistor and outputs a current detection signal, a control circuit that controls the power source circuit such that a voltage of the current detection signal approaches a target value, a bypass circuit connected in parallel to the semiconductor light sources, and including a clamp element having a clamp voltage higher than a maximum voltage during operation of the semiconductor light sources and a bypass resistor connected in series to the clamp element, and allowing current to flow when an open fault occurs in the semiconductor light sources, and detection circuits that respectively detect an open fault in the semiconductor light sources based on an end-to-end voltage of the bypass resistors.

Abstract: A power conversion device, mounted on a motor vehicle, has a battery, a power converter, a reactor and a control unit. The power conversion device boosts a battery voltage of the battery, and supplies a boosted voltage to a motor generator mounted on a motor vehicle. The power conversion device transmits electric power generated by the motor generator and supplies the generated electric power to the battery through the power converter. The power converter has an upper arm and a lower arm. The upper arm has upper arm side switching elements. The lower arm has lower arm side switching elements which are directly connected to the respective upper arm side switching elements. At least one of the upper arm side switching elements is composed of a MOS FET and at least one of the lower arm side switching elements is composed of an IGBT.

Abstract: A controller includes a voltage detection terminal, a current detection terminal and a voltage sensing terminal. The voltage detection terminal senses a second output voltage. The current detection terminal senses a current of a light source. The second output voltage is sensed prior to the current of the light source. The voltage sensing terminal receives a voltage sensing signal indicative of a first output voltage. The controller adjusts the voltage sensing signal based on the second output voltage, to enable the second output voltage in a preset voltage range; when the second output voltage is in the preset voltage range, the controller adjusts the adjusted voltage sensing signal based on a difference between the current of the light source and a target current value, to enable the current of the light source to maintain the target current value.

Abstract: An overcurrent detection circuit includes a di/dt detection circuit to detect di/dt of a current Ie that flows in an emitter of an IGBT, a control circuit to detect whether the current Ie is an overcurrent based on di/dt and to output a detection result to a driving circuit, and a mask circuit to set a mask period in which an operation of overcurrent determination in the control circuit is masked.

Abstract: A power conversion device includes an input detector for detecting input parameters of the DC input to the inverter; an output detector for detecting output parameters of the DC output from the power converter device; a duty calculator for calculating a duty for the switching elements of the inverter; a frequency search range calculator for determining an upper limit and a lower limit of a frequency search range for determining the drive frequency after the operating condition is changed, using at least one parameter of the input parameters, the output parameters, and a duty parameter; and a frequency search processor for determining the drive frequency by searching the frequency search range.

Abstract: Systems and methods are provided for protecting a power conversion system. A system controller includes a two-level protection component and a driving component. The two-level protection component is configured to detect an output power of a power conversion system and generate a protection signal based on at least information associated with the output power. The driving component is configured to generate a drive signal based on at least information associated with the protection signal and output the drive signal to a switch associated with a primary current flowing through a primary winding of the power conversion system. The driving component is further configured to generate the drive signal corresponding to a first switching frequency to generate the output power equal to a first power threshold and generate the drive signal corresponding to a second switching frequency to generate the output power equal to a second power threshold.

Abstract: A power inverter configured to convert electrical power from an energy source to electrical power that can be pushed into a utility grid. The power inverter comprises a power train and a controller having an address. The controller is configured to provide gate drive signals to the power inverter for the power inverter to operate. The controller comprises a sensor for measuring electrical power that is pushed into the utility grid, non-volatile memory for storing an accumulated value of the electrical power, and a communication device configured to communicate information from the controller to a device remote from the power inverter. The controller is further configured to execute a smart contract corresponding to the address.

Abstract: A circuit topology and switching scheme for a circuit that includes an input voltage divider configured to provide a divided voltage that may be approximately half of a supply voltage. The circuit also includes a switching circuit with a first half-bridge that includes a first switching node and a second half-bridge that includes a second switching node. One or more switches are configured to connect the divided voltage to the first switching node and the second switching node.

Abstract: A method for independent real and reactive power flow control without sensing receiving end voltage in a power flow controller (PFC) includes calculating a first reference phase angle, calculating a first reference voltage, modifying the first reference phase angle calculated using a first phasor modifier, calculating a first reference current for a first terminal, calculating a second reference phase angle for current through the first terminal, calculating a second reference voltage across a second CMI by subtracting voltages at the first terminal and a second terminal, and controlling the first CMI and the second CMI for controlling the power flow through the PFC.

Abstract: A photovoltaic module includes: a solar cell module including a plurality of solar cells; and a junction box including a capacitor unit attached to one face of the solar cell module and that to stores DC power supplied from the solar cell module, and a dc/dc converter unit to convert the level of the stored DC power and output the same. Thus, power may be easily supplied through the junction box.

Abstract: The present disclosure discloses an active clamp circuit for a power semiconductor switch and a power converter using the same. The active clamp circuit includes: a discharging circuit, a first terminal of the discharging circuit being electrically connected to a collector of the power semiconductor switch; an unidirectional blocking circuit; a first voltage regulator diode connected in series with the unidirectional blocking circuit to form a series branch, a first terminal of the series branch being electrically connected to the collector of the power semiconductor switch; and a resistance-capacitance RC circuit, a first terminal of the RC circuit, a second terminal of the discharging circuit, and a second terminal of the serial circuit being electrically connected, a second terminal of the RC circuit being electrically coupled to a gate of the power semiconductor switch.

Abstract: A switched-mode power converter with current limit circuits for limiting the input current into the power converter and/or the output current is presented. The power converter contains a feedback loop for controlling the output voltage of the converter. A first voltage comparison unit within the feedback loop compares an output voltage with a reference voltage and outputs an error voltage based on the comparison. The power converter also contains a current control unit for limiting the input/output current. The current control unit contains a current comparison unit and a connection unit. The current comparison unit compares the input/output current with a current threshold and outputs an intermediate voltage based on the comparison. The connection unit connects the output of the current comparison unit and the output of the current comparison unit to the output of the first voltage comparison unit if the input/output current exceeds the current threshold.

Abstract: A switching power converter is provided that cycles a power switch during a group pulse mode of operation to produce a train of pulses within a group period responsive to a control voltage being within a group mode control voltage range. Depending upon the control voltage, the number of pulses in each train of pulses is varied to provide a linear power delivery to the load.

Abstract: A switched-mode power converter with current limit circuits for limiting the input current into the power converter and/or the output current is presented. The power converter contains a feedback loop for controlling the output voltage of the converter. A first voltage comparison unit within the feedback loop compares an output voltage with a reference voltage and outputs an error voltage based on the comparison. The power converter also contains a current control unit for limiting the input/output current. The current control unit contains a current comparison unit and a connection unit. The current comparison unit compares the input/output current with a current threshold and outputs an intermediate voltage based on the comparison. The connection unit connects the output of the current comparison unit and the output of the current comparison unit to the output of the first voltage comparison unit if the input/output current exceeds the current threshold.

Abstract: Provided is apparatus and a method for driving synchronous rectifiers, which relate to the field of power supplies for communications. The apparatus includes: detection circuits, wherein each of the detection circuits is configured to detect drain and source voltages of one of synchronous rectifiers to obtain a detection signal for indicating a current direction in the one of the synchronous rectifiers; an isolated driving circuit, configured to generate isolated driving signals for driving the synchronous rectifiers according to the detection signals output by the detection circuits; and the synchronous rectifiers, configured to synchronously rectify input signals from a main transformer by using the isolated driving signals. The present disclosure can obtain the isolated driving signals of the synchronous rectifiers simply and effectively, and has a superior protective feature in case of shoot-through and other abnormalities.

Abstract: An electronic circuit comprising an ACRF comprising an active component, an energy storage unit, an input port and an output port. The electronic circuit comprises a control unit to control the ACRF. A detector detects a short circuit at the input port or the absence of an energy supply at the input port. The control unit controls the ACRF to function as an ACRF if the detector detects a power supply connected to the input port or that there is no short circuit at the input port, and controls the ACRF to stop functioning as an ACRF and to discharge energy from its energy storage unit to its output port if the detector detects a short circuit at the input port or no power supply connected to the input port.

Abstract: Disclosed are a power conversion apparatus and a photovoltaic module. The power conversion apparatus includes a converter unit configured to convert a direct current (DC) voltage from a solar cell module, a clamp unit configured to limit a surge voltage in the converter unit, and a controller configured to control the converter unit. Through this configuration, the power conversion apparatus is capable of limiting a surge voltage depending on operation of the converter unit.