Sanken Electric Co., Ltd.

Shimane University

Nagoya University

National University Corporation Shimane University

Hiromitsu Terui

Hideki Asuke

Hideharu Takano

Masayoshi Yamamoto

Takahiro Kawashima

Jun Imaoka

A rectification circuit rectifies an alternating current voltage of an alternating current power supply. A parallel converter comprises converters that correspond to phases and that are connected in parallel to an output terminal of the rectification circuit. Each converter comprising a reactor, a switching circuit that is connected in series to the reactor and a diode that is connected in series to the reactor. A smoothing capacitor is connected to an output terminal of the parallel converter. A control circuit generates pulse signals corresponding to phases based on an error voltage between an output voltage of the smoothing capacitor and a reference voltage and on an output voltage of the rectification circuit, and switches the switching circuits in the converters using the pulse signals. Current detection circuits are provided corresponding to the converters and that detect currents flowing through the switching circuits.

Multiphase power factor improvement circuit

A bidirectional DC-DC converter includes a series circuit of a first winding of a first reactor, a second reactor, and a first switch connected to both ends of a first DC power source, a series circuit of a second switch and a second DC power source connected to both ends of the first switch, a series circuit of a second winding of the first reactor, a third reactor, a first selector switch, and a first diode connected to both ends of a series circuit of the second reactor and the first switch, a series circuit of a second selector switch, a second diode, and the second DC power source connected to both ends of a series circuit of the first selector switch and first diode, and a controller turning on/off the switches and the selector switches.

Bidirectional DC-DC converter

A resonant power conversion apparatus includes a transformer Thaving a primary winding n, a secondary winding n, a tertiary winding n, and a reset winding nR, a series circuit of switches Sand S, a capacitor Crand diode Dto the switch S, a capacitor Crand diode Dto the switch S, a series circuit of the winding nand a diode Dn, a series circuit of the winding nR and a diode DR, a reactor Lr connected between a connection point of the switches Sand Sand a connection point of the windings nand n, a switch Sconnected between the DC power source and the winding n, a switch Sconnected between the DC power source and the winding n, and a controllerconfigured to perform a zero-voltage switching operation of the switches Sand S

Resonant power conversion apparatus

Growing community of inventors

Niiza, Japan

Hiromitsu Terui