Direct-current converter having active clamp circuit

Details Direct-current converter having active clamp circuit Direct-current converter having active clamp circuit

2007-07-31

2007-07-31

Riley, Shawn (Department: 2838)

Electric power conversion systems

Current conversion

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

Reexamination Certificate

active

10531766

ABSTRACT:
Provided is a direct-current converter which can reduce power consumption at light load by reducing switching losses of a main switch. The direct-current converter is provided with: a first serial circuit which is connected to both ends of a direct current power supply Vdc1and in which a primary winding P of a transformer T and a main switch Q1are serially connected to each other; a second serial circuit which is connected both ends of the primary winding P of the transformer T and in which an auxiliary switch Q2and a snubber capacitor C2are serially connected to each other; rectifying/smoothing circuits D5, D6, L1and C5which rectify and smooth a voltage generated in a secondary winding S of the transformer T by energy supplied from the primary winding P of the transformer T when the main switch Q1is turned on; and a control circuit10which turns on/off the main switch Q1and the auxiliary switch Q2alternately using a signal with predetermined switching frequency. The control circuit10reduces the switching frequency during light load.

REFERENCES:
patent: 6320765 (2001-11-01), Yasumura
patent: 6366476 (2002-04-01), Yasumura
patent: 6466462 (2002-10-01), Nishiyama et al.
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patent: 2002-199719 (2002-07-01), None
patent: 2003-143851 (2003-05-01), None
Kosuke Harada, “Suicchingu Dengen Handobukku (Switching Power Supply Handbook)”, p. 27, Fig. 2.2, Nikkan Kogyo Shinbun Ltd., 2000.
Kazuo Shimizu, “Kosoku Suicching Regyureta (High-Speed Switching Regulator)”, p. 30, Fig. 2.5, Sogo Denshi Syuppan, 1981.

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