A switching converter has a first converter output for connection to a user load and a second converter output for connection to the user load. A first direct current rail power negative terminal has a first positive output and a first negative output connected to the second converter output. A second direct current rail power negative terminal has a second negative output and a second positive output connected to the first positive output. A first switch has a first positive terminal connected to the first positive output, a first negative terminal and a first control terminal. A second switch has a second positive terminal connected to the first negative terminal, a second negative terminal connected to the second negative output, and a second control terminal. A pulse width modulator has a first modulator output connected to the first control terminal, and a second modulator output connected to the second control terminal. An inductance is connected between the first converter output and the first negative terminal. A comparator controls the first pulse width modulator based on a voltage difference between a current measurement voltage that varies based on current through the inductance and a first set point voltage.

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. The switching power supply device further includes a control unit for dynamically changing dead times of the full-bridge type switching circuit based on the power factor improvement circuit output voltage, and the output current and the output voltage to be supplied to the load, and the control unit applies the dead times that have been changed to control switching of the full-bridge type switching circuit.

An electronic circuit includes: a bus bar connected to a power source having a positive terminal and a negative terminal; and a plurality of object switching elements as driving objects connected to the bus bar, the object switching elements forming a parallel connected circuit. The object switching elements include minimum on-resistance elements having minimum on-resistance compared to other object switching elements in a corresponding current region among mutually different current regions; and connection points between the minimum on-resistance elements and the bus bar are located at different locations to have mutually different inductance of respective conduction paths between the power source to the connection points located at the different locations.

The present application provides a driving circuit of power devices, a switching circuit and a power conversion circuit. The driving circuit is configured to control switching actions of N power devices connected in parallel, where N≥2 and N is a positive integer; the driving circuit includes a driving input circuit and a common magnetic bead, where a first end of the driving input circuit is electrically connected to N first ends of the common magnetic bead, N second ends of the common magnetic bead are electrically connected to control ends of the N power devices in a one-to-one correspondence, and a second end of the driving input circuit is electrically connected to second ends of the N power devices.

A drive circuit driving a first switching element, including: a first diode with a cathode terminal connected to a first switching element gate terminal; a second switching element with a first terminal connected to a first diode anode terminal, a second terminal connected to a first switching element gate terminal, a third terminal connected to a first switching element source terminal; a third switching element with a drain terminal connected to the first diode anode terminal, and a source terminal connected to the first switching element source terminal; a parallel circuit; and a drive transformer having a coil, one end connected to the drain terminal, the other end connected to the third switching element gate terminal, and connected to the third switching element source terminal, one end of the parallel circuit connected to one coil end, the second diode cathode terminal connected to the other end of the coil.

Power switch driver for driving a control terminal of a power switch to drive a load, the power switch driver having a in negative feedback circuit to control current delivered to the control terminal, the negative feedback circuit comprising:—a current output circuit comprising at least one of a current source and a current sink, the current output circuit for providing a said current of a said control terminal and configured to receive an output current control signal to control magnitude of the current provided by the current output circuit;—a terminal voltage input circuit for receiving a voltage from a said control terminal and to output an indication of said voltage;—an amplifier coupled to amplify the terminal voltage indication to generate an amplifier output; and—a reference voltage input circuit for receiving a reference voltage, comprising at least one resistor, the reference voltage input circuit coupled to a charge supply input of the amplifier, wherein—the power switch driver is configured to generate the output current control signal dependent on the amplifier output, and—the power switch driver is configured to reduce the current provided by the current output circuit responsive to an increase in the voltage received by the terminal voltage input circuit.

The present uninterruptible power supply apparatus includes a converter (5) configured to convert AC power into DC power; an inverter (10) configured to convert DC power into AC power and supply the converted AC power to a load (24); and a control device (18) configured to control the converter (5) and the inverter (10). The control device (18) is configured to execute a mode selected from a sinusoidal wave output mode and a waveform distortion generation mode. In the sinusoidal wave output mode, an AC voltage (VO) with a sinusoidal waveform and with no waveform distortion is supplied to the load (24). In the waveform distortion generation mode, an AC voltage (VO) with waveform distortion within an allowable range for the load (24) is supplied to the load (24).

A power converting device, in one possible configuration, includes a chopper circuit with a first semiconductor switching device, a fast recovery diode, and an inductor of which one end is connected to a connection point connecting between the first semiconductor switching device and fast recovery diode; a series circuit, connected in parallel with the fast recovery diode, including a rectifying diode with a greater reverse recovery loss and a smaller forward voltage drop than those of the fast recovery diode, and a second semiconductor switching device. The second semiconductor switching device has a lower breakdown voltage and a smaller forward voltage drop than those of the first semiconductor switching device, is configured to turn on when the first semiconductor switching device is turned off, and is configured to turn off at a timing before the first semiconductor switching device shifts from an off-state to an on-state.

A power conversion apparatus includes a semiconductor module including a semiconductor device and a control circuit unit controlling the semiconductor module. The semiconductor module has main and subsidiary semiconductor devices connected in parallel. The control circuit unit performs control such that the subsidiary semiconductor device is turned on after the main semiconductor device is turned on, and the main semiconductor device is turned off after the subsidiary semiconductor device is turned off. The control circuit unit performs control such that, one of the turn-on and turn-off switching timings has a switching speed faster than that of the other of the switching timings. The semiconductor module is configured such that, at a high-speed switching timing, an induction current directed to turn off the subsidiary semiconductor device is generated in a control terminal of the subsidiary semiconductor device depending on temporal change of a main current flowing to the main semiconductor device.

A method of controlling a power converter, including executing a plurality of cycles, including: turning on a first switch during a first period, the first switch coupled to a power supply and a switch node; turning on a second switch during a second period, the second switch coupled to the switch node; turning on a third switch at a first time during the second period and turning the third switch off at a second time after the second period by a first open signal including a high discharge signal followed by a lower discharge signal, the third switch coupled to an auxiliary node and to a second inductor coupled to the auxiliary node; and turning on a fourth switch at a third time after the second time and turning the fourth switch off during the first period of a succeeding cycle, the fourth switch coupled to the auxiliary node.