Tdk Corporation

Naoyuki Ishibashi

Masahiko Hirokawa

Xiaofeng Wu

A power conversion apparatus includes: a first power terminal; a first arm including a first switching device between a first coupling terminal and a first node, a second switching device between the first node and a second node, and a third switching device between the second node and a second coupling terminal; a second arm including a fourth switching device between the first coupling terminal and a third node, a fifth switching device between the third node and a fourth node, and a sixth switching device between the fourth node and the second coupling terminal; a first inductor between the second node and a fifth node; a second inductor between the fourth and fifth nodes: a first capacitor between the fifth node and the second coupling terminal; a first transformer including a first winding and a second winding; a rectifying circuit; a second power terminal; and a control circuit.

Power conversion apparatus and power conversion system

A switching power supply unit includes: a transformer; an inverter circuit including first to fourth switching devices, first to third capacitors, first and second rectifying devices, a resonant inductor, and a resonant capacitor; and a driver. The first to fourth switching devices are coupled in series. The first and second capacitors are coupled in series. The first rectifying device is disposed between a first connection point between the first and second capacitors and a second connection point between the first and second switching devices. The second rectifying device is disposed between the first connection point and a third connection point between the third and fourth switching devices. The third capacitor is disposed between the second and third connection points. The resonant capacitor, the resonant inductor, and a primary winding are coupled in series between a fourth connection point between the second and third switching devices and the first connection point.

Switching power supply unit and electric power supply system

A switching power supply unit includes a pair of input terminals, a pair of output terminals, a transformer, an inverter circuit, a rectifying and smoothing circuit, and a driver. The inverter circuit includes first to fourth switching devices, a first capacitor, a resonant inductor, and a resonant capacitor. The rectifying and smoothing circuit includes a rectifying circuit including rectifying devices, and a smoothing circuit. The first to fourth switching devices are coupled in series in this order between two input terminals constituting the pair of input terminals. The first capacitor is disposed between a connection point between the first and second switching devices and a connection point between the third and fourth switching devices. The resonant inductor, the resonant capacitor, and a primary winding are coupled in series in no particular order between a connection point between the second and third switching devices and one of the two input terminals.

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Tokyo, Japan

Naoyuki Ishibashi