Switching power supply unit

Details Switching power supply unit Switching power supply unit

2007-12-25

2007-12-25

Berhane, Adolf (Department: 2838)

Electric power conversion systems

Current conversion

Including d.c.-a.c.-d.c. converter

C363S056020

Reexamination Certificate

active

11495621

ABSTRACT:
The present invention provides a switching power supply unit capable of suppressing a surge voltage generated in a rectifier element more effectively. A first resonance circuit is constructed by capacitors in a surge voltage suppressing circuit and an inductor, and resonance time of the first resonance circuit is set to be longer than recovery time of a diode in a rectifier circuit. According to at least one of a DC input voltage and an output current, either a first bridge circuit or a second bridge circuit is selectively allowed to perform switching operation. At the time of forward-direction operation, the first resonance circuit is formed by the capacitors in the surge voltage circuit and the inductor on the high voltage side. At the time of reverse-direction operation, a second resonance circuit is formed by the capacitors and an inductor on the low voltage side.

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Lee et al., “A Novel DC-DC Full-Bridge Converter using Energy-Recovery Circuit with Regenerative Transformer,” 2005 IEEE 99. 1543-1548.

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