Synchronous rectifier drive circuit for low output voltage...

Details Synchronous rectifier drive circuit for low output voltage... Synchronous rectifier drive circuit for low output voltage...

2007-03-27

2007-03-27

Han, Jessica (Department: 2838)

Electric power conversion systems

Current conversion

Using semiconductor-type converter

C363S021060, C363S021140

Reexamination Certificate

active

11025129

ABSTRACT:
A drive circuit for a synchronous rectifier has a transformer having a main secondary winding and an auxiliary secondary winding. A first switch and a second switch each have a pair of terminals, a terminal of the first switch being connected to the first end of the main winding, a terminal of the second switch being connected to the second end of the main winding, and each remaining terminal of the first and second switch being connected together. A third switch connects between the second end of the main winding and the first end of the auxiliary winding, wherein the third switch periodically closes to connect the main winding and the auxiliary winding in series, a drive voltage being developed by the connected main and auxiliary windings being used to control at least one of the first switch and second switch.

REFERENCES:
patent: 5590032 (1996-12-01), Bowman et al.
patent: 5625541 (1997-04-01), Rozman
patent: 6011703 (2000-01-01), Boylan et al.
patent: 6069799 (2000-05-01), Bowman et al.
patent: 6104623 (2000-08-01), Rozman
patent: 6370044 (2002-04-01), Zhang et al.
patent: 6912143 (2005-06-01), Gan et al.
patent: 2004/0022076 (2004-02-01), Tobita
patent: 1 369 981 (2003-05-01), None

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