Title:
EXTERNALLY-DRIVEN SCHEME FOR SYNCHRONOUS RECTIFICATION
Document Type and Number:
WIPO Patent Application WO2001033709
Kind Code:
A3
Abstract:
A self-driven synchronous rectifier circuit (50) for a DC-DC power converter. The circuit comprises a primary transformer (16), a first synchronous rectifier (SQ1) coupled to the primary transformer (16), a second synchronous rectifier (SQ2) coupled to the primary transformer (16), an external drive circuit (18). The circuit (50) also comprises a plurality of switches (SQ3, SQ4) controllably coupled to second synchronous rectifier (SQ2). The external drive circuit (18) provides turn-off signaling for both synchronous rectifiers (SQ1, SQ2). Turn-on signaling provided for first synchronous rectifier (SQ1) by the primary transformer (16) turn-on signaling for second synchronous rectifier (SQ2) is provided by the external drive circuit (18).
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Inventors:
FARRINGTON RICHARD W
SVARDSJO CLAES
HART WILLIAM
SVARDSJO CLAES
HART WILLIAM
Application Number:
PCT/US2000/041958
Publication Date:
December 13, 2001
Filing Date:
November 02, 2000
Export Citation:
Assignee:
ERICSSON INC (US)
International Classes:
H02M7/21; H02M3/28; H02M3/335; (IPC1-7): H02M3/335
Other References:
PATENT ABSTRACTS OF JAPAN vol. 1995, no. 03 28 April 1995 (1995-04-28)
PATENT ABSTRACTS OF JAPAN vol. 1997, no. 03 31 March 1997 (1997-03-31)
PATENT ABSTRACTS OF JAPAN vol. 1998, no. 13 30 November 1998 (1998-11-30)
PATENT ABSTRACTS OF JAPAN vol. 1997, no. 03 31 March 1997 (1997-03-31)
PATENT ABSTRACTS OF JAPAN vol. 1998, no. 13 30 November 1998 (1998-11-30)
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