Abstract: A synchronous rectification control device achieves high power conversion efficiency without supplying additional signal to a secondary side from a primary side. An insulated type switching power supply provides such a synchronous rectification control device. An output power is regulated based on a phase difference between two half bridges in the primary side. In the secondary side of the full bridge converter circuit, a center tap is lead out from the secondary windings of a transformer to obtain two symmetrical sections of windings. A device for detecting winding voltage observes winding voltages at terminals of the sections of windings. The synchronous rectification control circuit controls transistors and MOSFETs connected to the secondary windings to make the transistor in the ON or OFF state depending on the current flow in the secondary windings.

Abstract: A method and apparatus for converting a DC voltage to a lower DC voltage, provides for conducting current from an input terminal, through an inductor to charge a capacitor connected to the inductor at an output terminal and to provide a varying range of load current from the output terminal, alternately switching the input terminal between a supply voltage and a ground potential to produce a desired voltage at the output terminal that is lower than the supply voltage, while providing the varying range of load current, and disconnecting the input terminal from both the supply voltage and the ground potential to reduce an increase in voltage at the output terminal caused by a substantial reduction in the load current, while current through the inductor adjusts in response to the reduced load current.

Abstract: A bi-directional DC-DC converter has a transformer for connecting a voltage type full bridge circuit connected to a first power source and a current type switching circuit connected to a second power source. A voltage clamping circuit constructed by switching elements and a clamping capacitor is connected to the current type switching circuit. The converter has a control circuit for cooperatively making switching elements operative so as to control a current flowing in a resonance reactor.

Abstract: A bi-directional switch for a power converter comprises first and second transistors (SW1, SW2) and a floating supply capacitor (C2) associated with the second transistor (SW2). The drive circuit and/or gate of the first transistor (SW1) is charged by the floating supply capacitor (C2) of the second transistor (SW2). The charging takes place at a predetermined moment in the switching cycle, and in particular at a moment in the switching cycle when the voltage across the bi-directional switch is substantially a minimum.

Abstract: A DC-DC converter of a synchronous rectifier type, a control circuit thereof and control method thereof, facilitates detecting and interrupting negative inductor current IL with low power consumption, high accuracy and a simple configuration and facilitates improving the efficiency under a light load. An ON-period decision circuit determines whether an ON-period of the synchronous rectifier switch is too long or too short. An ON-period adjustment circuit generates a signal for adjusting the ON-period, during which the synchronous rectifier switch is ON, based on the decision of the ON-period decision part. A delay circuit adjusts the length of the delay, from the time when a signal changing the ON and OFF states of the synchronous rectifier switch changes to ON, to the time when the synchronous rectifier switch is forcibly turned off based on the adjusting signal.

Abstract: A trigger signal generating device includes a first power source terminal and a second power source terminal; a first current generator to generate a first current with a first amplitude in accordance with the amplitude of the input signal; a second current generator to generate a second current with a second amplitude, the second current being flowed from the first power source terminal to the second power source terminal; a current mirror circuit to amplify the second current generated from the second current generator to obtain an amplified current; and a trigger signal generator to convert the amplified current into a trigger signal used for triggering a trigger device, the voltage amplitude of the trigger signal being corresponding to the current amplitude of the amplified current; wherein both of the first and second current generators are connected to either one of the first and second power source terminals.

Abstract: A synchronous regulation circuit is provided to improve the efficiency of the power converter. A primary-side switching circuit generates a synchronous signal and a switching signal. The switching signal is used for soft switching a transformer. A secondary-side switching circuit is coupled to the output of the power converter to generate a pulse signal in response to the synchronous signal and the output voltage of the power converter. The pulse signal is a differential signal generated for the rectifying and the regulation of the power converter. A synchronous switch includes a power switch and a control circuit. The control circuit receives the pulse signal for turning on/off the power switch. The power switch is connected in between the transformer and the output of the power converter. Furthermore, a flyback switch is operated as a synchronous rectifier to freewheel the inductor current of the power converter. The flyback switch is turned on in response to the off of the power switch.

Abstract: An alternating current (AC) to direct current (DC) power converter comprises a first electrical path in a primary circuit having an inductor coupled in series with a first primary winding and a first switch to a ground connection. A second electrical path in the primary circuit has the inductor coupled in series with a second primary winding and a second switch to the ground connection. A secondary circuit is electromagnetically coupled to the primary circuit. A controller operates the first switch and the second switch in a predetermined manner to induce a current in the secondary circuits.

Abstract: A full-wave rectifier of the present invention, has an input AC power source, a pair of input terminal A and B, a pair of first and second switching element Q1 and Q2 comprises a first and a second Lus P-Channel FET, a pair of third and fourth switching element Q3 and Q4 comprises a third and a fourth Lus N-Channel FET, a pair of driving element R1 and R2, a load L1 and DC voltage output terminal C and D, the major function of AC to DC conversion.

Abstract: A Voltage Source Converter having at least one phase leg connected to opposite poles of a direct voltage side of the converter and comprising a series connection of switching cells has an arrangement configured to apply a pressure to opposite ends of stacks of semiconductor assemblies for pressing the assemblies towards each other so as to obtain electric contact between semiconductor assemblies in said stack while ensuring that the semiconductor assemblies of a first path of each switching cell of the converter go into a permanently closed circuit state in case of a failure of the respective switching cell. A second path of each switching cell has means configured to keep said second path including an energy storing capacitor non-conducting upon occurrence of a said failure.

Abstract: According to one aspect, embodiments of the invention provide power converter circuitry including an input including a plurality of input lines each configured to be coupled to a phase of a multiphase AC power source having a sinusoidal waveform, a plurality of DC buses including a first positive DC bus having a first nominal DC voltage, a second positive DC bus having a second nominal DC voltage, a first negative DC bus having a third nominal DC voltage and a second negative DC bus having a fourth nominal DC voltage; a first power converter coupled to the input and configured to supply power from the multiphase AC power source to the plurality of DC buses during a first positive region of the sinusoidal waveform and a first negative region of the sinusoidal waveform; and a second power converter coupled to the input and configured to supply power from the multiphase AC power source to at least some of the plurality of DC buses during a second positive region of the sinusoidal waveform and a second negative r

Abstract: An exemplary direct current (DC) to DC converter includes a first rectifying and filtering circuit configured to receive an alternating current (AC) voltage and transform the AC voltage to a first DC voltage, a pulse width modulation (PWM) circuit, a first transformer configured to receive the first DC voltage and transform the first DC voltage to a second AC voltage under control of the PWM circuit, and a second rectifying and filtering circuit including a first transistor and a control circuit for switching on or switching off the first transistor so as to transform the second AC voltage to a second DC voltage.

Abstract: A PI control section performs a PI control on a deviation which is a difference between a DC voltage command and a DC voltage, and outputs a d-axis current command value. A PI control section performs a PI control on a deviation which is a difference between the d-axis current command value and a d-axis current, and outputs a d-axis voltage command value. Based on the d-axis voltage command value and a q-axis voltage command value, a PWM control section outputs a switching control signal for controlling a switching operation of a converter. A voltage command computation section generates the DC voltage command based on the d-axis voltage command value.

Abstract: A rectifier circuit includes an input terminal that receives an alternating-current signal, a first rectifier circuit that generates a first direct-current voltage from the alternating-current signal, a bias-voltage generating circuit that generates a bias voltage from the first direct-current voltage, and a second rectifier circuit that generates a second direct-current voltage from the alternating-current signal biased with the bias voltage.

Abstract: An uninterruptible power supply has first and second input terminals, first and second inductors, first and second AC switch units, first and second storing devices and a control unit. The first and the second inductors are electrically connected to the first and the second input terminals. The first and the second AC switch units are electrically connected to the first and the second inductors for conducting input currents. The control unit is electrically connected to the first and the second AC switch units which may be turned on and off thereby to control the first and the second inductors which charge the input currents and discharge the input currents to the first and the second storing devices.

Abstract: A method and a device to compensate for an asymmetrical DC bias current in a multi-phase transformer. The transformer is connected between an AC power system and an AC/DC or DC/AC high voltage converter. For each phase of the AC side of the transformer a current quantity is determined. The current quantity reflects the time dependent behaviour of the magnetizing current in the phase. Time intervals in the current quantity are determined during which the current quantity reaches a positive or a negative maximum, respectively. A DC magnetizing quantity is determined from a difference between the amplitude of the positive maximum and the amplitude of the negative maximum.

Abstract: An electronic device having at least a loop-shaped electric conductor generating electric power by electromagnetic induction is provided. The electronic device includes a voltage-detecting unit, a voltage-comparing unit and a separating unit. The voltage-detecting unit is configured to detect a voltage generated in the electric conductor by the electromagnetic induction. The voltage-comparing unit is configured to make a comparison between the voltage detected by the voltage-detecting unit and a predetermined reference voltage and determining whether the voltage detected by the voltage-detecting unit exceeds the predetermined reference voltage. The separating unit is configured to break an electric connection between the electronic conductor and an electronic circuit connecting to the electric conductor when the voltage-comparing unit determines that the voltage detected by the voltage-detecting unit exceeds the predetermined reference voltage.

Abstract: A method in connection with a frequency converter for correcting the power factor of the frequency converter, and a power factor correction unit. The method includes connecting the power factor correction unit between a rectifier bridge of the frequency converter and the supplying AC voltage network, generating with the power factor correction unit DC voltage from the AC voltage of the supply network and feeding the generated DC voltage to the frequency converter via the rectifier bridge of the frequency converter.

Abstract: A bidirectional switch circuit includes two switching elements connected to conduct a current in both directions. The two switching elements are connected in series to each other. Of the two switching elements, the switching element to which a reverse voltage is applied, a voltage of a source of one of the switching elements being higher than a voltage of a drain of the one, is configured to conduct a current from the source to the drain even when an on-drive signal is not being input to a gate terminal of the one.

Abstract: A converter and an inverter are connected via a clamp circuit. The converter performs commutation in accordance with any of a first commutation mode in which trapezoidal waves are compared with a carrier and a 120-degree conduction mode. A diode of the clamp circuit is short-circuited by a shorting switch. The shorting switch is rendered conductive when a power factor reduces or a power supply voltage reduces, and capacitors of the clamp circuit are connected in series between DC power supply lines. The converter performs commutation in accordance with the 120-degree conduction mode, not in accordance with the first commutation mode, while the shorting switch is conductive.

Abstract: Systems and methods control timing of switches in power regulators and power amplifiers. The systems and methods monitor a switch node voltage and obtain rising and falling edges of signals obtained from the monitoring. The systems and methods utilize the rising and falling edges of switch drive signals and predetermined data to obtain delay times for subsequent drive signals.

Abstract: A device for transmitting electric power between alternating voltage networks includes converters interconnected by direct current lines and provided each with several six-pulse conversion bridges. The six-pulse conversion bridges of one same converter are capable of being connected to an alternating voltage network associated with the converters via inductances differently phase-shifted. A control unit is provided to energize the valves of the six-pulse conversion bridges. The device is more economical and the converters are interconnected by a plurality of direct current circuits, each direct current circuit being galvanically separated from at least an alternating voltage network.

Abstract: Disclosed is a rectifier circuit in order to adaptively reduce a threshold voltage of a diode module constituting the rectifier circuit using an output voltage of the rectifier circuit. A PMOS diode module flowing the forward current from an input terminal to an output terminal comprises: a first PMOS transistor including a source and a drain connected to the input terminal and the output terminal, respectively; a second PMOS transistor including a source connected to the output terminal, and a gate and a drain connected to each other; a switch connecting the gate of the first PMOS transistor to one of the output terminal and the drain of the second PMOS transistor; and a bias resistor including one terminal connected to the gate of the second PMOS transistor and another terminal to which a bias voltage is applied.

Abstract: Disclosed are a synchronous rectifier control device and a forward synchronous rectifier circuit. The synchronous rectifier control device is coupled with the secondary side of the forward synchronous rectifier circuit, comprising a condition detecting unit, a reference time circuit and a synchronous signal generator. The condition detecting unit receives at least one reference signal and a detecting signal in response to the condition of the secondary side of the forward synchronous rectifier circuit, and accordingly generates a first synchronous control signal. The reference time circuit is coupled with the condition detecting unit, and generates a reference time signal in response to the first synchronous control signal. The synchronous signal generator generates a second synchronous control signal in response to the first synchronous control signal and the reference time signal.

Abstract: In order to prevent a short circuit of top and bottom arms of a motor driving IC when noise is added to six control signals for controlling six switching elements, there is provided a semiconductor device for driving a motor, being sealed with resin as one package and comprising: six switching elements for driving a three-phase motor; three output terminals for outputting voltages to the three-phase motor; at least one driving circuit for driving the six switching elements; three control signal input terminals; and a function) of generating six control signals for control of the six switching elements based on three control signals inputted through the three control signal input terminals.

Abstract: A switching power source device for supplying power to a load includes a series resonant circuit, a plurality of main switch elements or main switch element groups for switching a current path of the series resonant circuit, a transformer for inducing a secondary current from the series resonant circuit, a plurality of synchronous rectification switch elements for rectifying the secondary current, a maximum on width control circuit for ordering a start and a completion of a maximum on width to the synchronous rectification switch element in synchronization with a timing of turning on the main switch elements or the main switch element groups, and a synchronous control circuit. The circuit controls an on period of the synchronous rectification switch element so as to turn on the synchronous rectification switch element in synchronization with a particular timing, and turn off in synchronization with another timing.

Abstract: An electrical power generation system includes a power source (102) and power conversion electronics (104) coupled to the power source to rectify phased currents received from the power source and maintain a power conversion voltage used to provide excitation to the power source. The system also includes a power conditioner (108) coupled between the power conversion electronics and a load (108), the power conditioner operating as a filter in a normal operational mode and as a buck converter in an abnormal operational mode.

Abstract: A current-driven synchronous rectifying drive circuit designed for a T-type voltage doubler rectifier with an energy feedback circuit including a clamp and energy feedback circuit, a high frequency transformer, a current transducer, an energy storage capacitor, an output capacitor, a first and a second synchronous rectifier, and a first drive circuit connected to the first synchronous rectifier and a second drive circuit connected to the second synchronous rectifier.

Abstract: A bi-directional DC-DC converter has a transformer for connecting a voltage type full bridge circuit connected to a first power source and a current type switching circuit connected to a second power source. A voltage clamping circuit constructed by switching elements and a clamping capacitor is connected to the current type switching circuit. The converter has a control circuit for cooperatively making switching elements operative so as to control a current flowing in a resonance reactor.

Abstract: Disclosed herein is a power source apparatus utilizing a synchronous rectification system, including: a main transformer; a first field effect transistor; a second field effect transistor; and a gate driver.

Abstract: A bus centering device for use in an aircraft electrical power distribution system that includes a positive bus rail, a negative bus rail, and a ground is described. The device includes a central node, a first and second switching component configured to couple the central node to the positive rail and the negative rail for a first and second predetermined duty cycle, respectively. The device includes an inductive component coupled between the central node and ground, and is configured to maintain a voltage at the central node substantially equal to ground, wherein a voltage between the positive rail and the central node is maintained substantially equal to a voltage between the negative rail and the central node. The device includes a first and second current limiting device configured to maintain a continuity of current from the inductive component when the first and second switching components are turned off.

Abstract: A synchronous rectifier type SRC for operating in an intermittence mode, which includes: an input power for supplying an input DC voltage; an input-side switching unit; a transformer with a primary winding and a secondary winding; an output-side switching unit for switching; and a gate driving circuit for detecting. According to the synchronous rectifier type SRC, a no-load characteristic can be controlled with an easy scheme and a simple construction. In addition, a simple resistor is added, and thus dead time can be generated. Consequently, it is possible to simply reduce switching loss that may occur in zero voltage switching.

Abstract: The present invention relates to an electronic driver circuit and a corresponding method for supplying an electronic load (LED1, LED2, . . . , LEDn) with a DC current or voltage (Vload). To achieve a high efficiency and a low thermal stress on the electronic load, the proposed driver circuit comprises:—an AC input (L, N) for receiving an AC input voltage (Vmains), two buck-boost converters (10, 20) for alternately operating as rectifier for rectifying said AC input voltage (Vmains) and as DC/DC converter for DC conversion of said rectified AC input voltage, a control unit (11, 12, 13, 21, 22, 23; 40) for monitoring the zero crossing of the AC input voltage (Vmains) and for controlling said two buck-boost converters (10, 20) to change their modes of operation upon detection of a zero crossing, such that during all periods one buck-boost converter operates as rectifier and the other buck-boost converter operates as DC/DC converter.

Abstract: A switching power converter has at least one electronic power switch. To minimize switching losses and optimize efficiency, the gate drive voltage level used to drive the electronic power switch is optimized. In an aspect, a digital controller generates optimizes the gate drive voltage using efficiency optimization algorithms, which in an aspect are programmed in the digital controller. In accordance with an aspect of the present disclosure, the switching power supply has at least two electronic power switches coupled in parallel. Optimization algorithms are used to determine the optimum number of switched electronic power switches that are actively being switched at a given time in order to achieve optimized efficiency for condition changes, such as input voltage variation, load and environmental temperature changes. In an aspect, the algorithms are programmed in a digital controller chip.

Abstract: A three-phase AC/DC active power converter provides an H-bridge that is controlled by a DSP (digital signal processing) controller that places the H-bridge in a voltage-boost mode of operation when voltage of a DC-link capacitor maintained by the H-bridge is near than the voltage input from a three-phase power source. The voltage difference between the boosted DC-link voltage and the three-phase power source voltage provides a voltage potential thereby giving the control loops a possible gain value. The gain value provides loop stability to thereby prevent an inrush of electrical current into the power converter upon startup. The converter also allows harmonic distortion to be modified through wave shaping of the normally pure sinus conduction signal.

Abstract: A power supply module is configured for converting an AC voltage to a first DC voltage and applying the first DC voltage to a load. The power supply module includes a rectifying and filtering unit, a PFC unit, a voltage transforming unit, an input port, and a switch unit. The rectifying and filtering unit rectifies the AC voltage into a primary DC voltage and filters the primary DC voltage. The PFC unit corrects a power factor of the filtered primary DC voltage. The voltage transforming unit converts the corrected primary DC voltage and generates the first DC voltage for applying the load. The input port receives a first instruction or a second instruction and generates a first signal or a second signal, respectively. The switch unit establishes or disconnects an electrical connection between the voltage transforming unit and the load according to the first signal or the second signal.

Abstract: A rectifier circuit can include an input circuit and first and second silicon carbide (SiC) bipolar junction transistors (BJTs). The input circuit is configured to respond to an alternating current (AC) input signal by generating a first pair of opposite polarity AC signals and a second pair of opposite polarity AC signals. The first pair of AC signals has a greater voltage range than the second pair of AC signals. The first and second SiC BJTs each include an input terminal connected to receive a different one of the second pair of opposite polarity AC signals, a base terminal connected to receive a different one of the first pair of opposite polarity AC signals, and an output terminal connected to a rectified signal output node of the rectifier circuit.

Abstract: An offline synchronous switching regulator is proposed for improving the efficiency thereof. Switches are coupled to switch a transformer and generate a switching signal at a secondary side of the transformer. A switching circuit is coupled to an output of the regulator to generate pulse signals in response to the switching signal and a feedback signal. Pulse signals are utilized to control a synchronous switch for rectifying and regulating the regulator. The synchronous switch includes a power-switch set and a control circuit. The control circuit receives pulse signals for turning on/off the power-switch set. The power-switch set is connected in between the transformer and the output of the regulator. A flyback switch freewheels an inductor current and can be turned on in response to the off state of the power-switch set whose on-time is correlated to the on-time of the power-switch set.

Abstract: A method for operating a power controller is provided. The method includes activating a rectifying FET upon a detection of an activation body diode conduction current occurring in the rectifying FET. The method generates an activation signal for a corresponding primary FET. The method further includes deactivating the corresponding rectifying FET upon a reception of a deactivation signal. The method further includes then deactivating the corresponding primary FET after delaying the deactivation signal, wherein the delay lessens a conduction time of a deactivation body current of the corresponding rectifying FET. The method further includes generating a deactivation signal and deactivating the corresponding rectifying FET upon a reception of the deactivation signal and deactivating the primary FET after delaying the deactivation signal. The delaying lessens a conduction time of a deactivation body current of the corresponding rectifying FET.

Abstract: A synchronous regulation circuit is provided to improve the efficiency for an offline power converter. A secondary-side switching circuit is coupled to the output of the power converter to generate a synchronous signal and a pulse signal in response to an oscillation signal and a feedback signal. An isolation device transfers the synchronous signal from the secondary side to the primary side of the power converter. A primary-side switching circuit further receives the synchronous signal to generate a switching signal for soft switching a transformer. The pulse signal is utilized to control a synchronous switch for rectifying and regulating the power converter. The synchronous switch includes a power switch and a control circuit. The control circuit receives the pulse signal for turning on/off the power switch. The power switch is connected in between the transformer and the output of the power converter.

Abstract: A DC-DC flyback converter, includes a three-winding transformer; a primary power circuit having a first MOSFET connected to a first winding of the transformer; a secondary power circuit connected to a second winding of the transformer terminals; and a self-driven circuit connected to a third winding of the transformer. The secondary power circuit includes a synchronous rectifier in the form of a second MOSFET and the self-driven circuit further includes a delay drive circuit, an isolation differential circuit, a negative removal circuit having a third MOSFET and a synchronous rectifier trigger switch-off circuit for switching the synchronous rectifier to an off condition.

Abstract: Disclosed is a flyback converter with a synchronous rectifier, in which the synchronous rectifier includes a synchronous switch, a current transformer connected in series between a drain terminal of the synchronous switch and an output terminal, and a secondary synchronous rectification driver connected to the gate terminal of the synchronous switch. Furthermore, a shunt resistor is connected in parallel with the current transformer for providing a current bypass path for a secondary current flowing through the synchronous switch and the current transformer, and thereby reducing the current flowing through the current transformer. Thus, the overall efficiency of the flyback converter can be enhanced and the life of the current transformer can be prolonged.

Abstract: A system for converting alternating electrical current to direct electrical current may include an input supply for supplying alternating electrical current. The input supply may be connected to a rectifier. The rectifier may be configured as a body diode. A comparator may be coupled to the rectifier. The comparator may apply a voltage to the rectifier when the input supply is operating.

Abstract: Disclosed is a PWM rectifier in which switching losses in a semiconductor device are reduced without degrading the response of a control system. In a PWM overmodulation region, the modulation scheme is set to a three-phase modulation scheme. In other regions, a switchover condition such as the amplitude of an input current is acquired and compared with a switchover level. If the switchover condition equals or exceeds the switchover level, the modulation scheme is switched over to a modified two-phase modulation scheme which reduces the number of switching operations to two thirds for the same PWM frequency.

Abstract: An implantable sensor includes electronic circuitry for automatically performing on a periodic basis, e.g., every 1 to 24 hours, specified integrity tests which verify proper operation of the sensor.

Abstract: A DC power source device is provided which comprises conduction detectors 17, 18 for producing detection signals VP1, VP2 during the detective period of rectification MOS-FETs 15, 16 and timer circuits 19, 20 connected to polarity detectors 17, 18. Timer circuits 19, 20 count output time of detection signal VP1, VP2 from polarity detectors 17, 18 until electric current through one of rectification MOS-FETs 15, 16 comes to zero, and turns the other of rectification MOS-FETs 15, 16 off immediately before termination of the counted time so that timer circuits 19, 20 can reliably turn rectification MOS-FETs 15, 16 off during the conductive period of forward current flow for efficient synchronous rectification.

Abstract: The control apparatus for controlling a voltage transforming apparatus having a transformer, power switching elements disposed in a primary side, and synchronous-rectifying switching elements disposed in a secondary side includes a judging circuit making a judgment as to whether or not an output current of the voltage transforming apparatus is smaller than a specified current on the basis of a primary-side current of the transformer and an inhibition circuit inhibiting the synchronous-rectifying switching elements from performing their synchronous-rectifying control operation when the judging circuit judges that the output current is smaller than the specified current. The judging circuit makes the judgment on the basis of the primary-side current flowing through the primary coil of the transformer immediately before the power switching elements are turned off.

Abstract: A controller for controlling a controlled switching device functioning as a synchronous rectifier of alternating current, the controller comprising a control circuit for sensing the direction of current through the controlled switching device, the controlled switching device comprising a MOSFET having a conduction channel and a parasitic body diode and having two main current carrying terminals and a control terminal, the control circuit generating a control signal provided to the control terminal to turn on the controlled switching device approximately when current begins to flow in a first direction through the controlled switching device and turn off the controlled switching device approximately when current begins to flow in a second opposite direction through the controlled switching device, further wherein the control circuit for sensing the direction of current through the controlled switching device main current carrying terminals comprises a sensing circuit coupled across the controlled switching dev

Abstract: A control circuit for a power converter includes a voltage command unit that generates a voltage command signal, a voltage command compensation unit that compensates the voltage command signal to generate a compensatory voltage command signal, and a switching pattern arithmetic unit that generates a switching signal for each of semiconductor switching elements of the power converter based on the compensatory voltage command signal and a carrier wave. The conversional fundamental frequency of the power converter is f and the carrier frequency of the carrier wave is fc. The voltage command compensation unit generates a compensation signal including at least one compensatory frequency component of fc?n×f (where n denotes successive positive and negative integers), and generates the compensatory voltage command signal.

Abstract: A high voltage rectifier device exhibiting low forward resistance and fast switching time formed of a high voltage structure connected in a cascode configuration with a low voltage structure. The high voltage structure is a bidirectional normally on semiconductor switch have two pairs of gate and source terminals which shuts off if either of the gate terminals is reverse biased. The low voltage structure is a diode, preferably a Schottky or barrier diode. The device is advantageously formed as an integrated circuit. With one of the terminal pairs of the switch clamped to zero volts, the device behaves as a diode, or the second terminal pair can be employed to provide the functions of a three terminal controlled rectifier. Among other possible applications are integrated circuits using four of the devices as a bridge rectifier, and as an anti-parallel diode for connection with an IGBT.