DC converter

Details DC converter DC converter

2007-12-04

2007-12-04

Riley, Shawn (Department: 2838)

Electric power conversion systems

Current conversion

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

C363S021080

Reexamination Certificate

active

11355166

ABSTRACT:
A DC converter has a transformer with loosely coupled primary and secondary windings, a main switch connected in series with the primary winding of the transformer, and a series circuit connected to ends of one of the primary winding and main switch. The series circuit includes a clamp capacitor and an auxiliary switch. The main and auxiliary switches are alternately turned on/off so that a voltage of the secondary winding of the transformer is synchronously rectified with synchronous rectifiers and is smoothed with smoothing elements, to provide a DC output. The DC converter also includes a tertiary winding tightly coupled with the primary winding of the transformer, a voltage source to supply a voltage lower than a voltage generated by the tertiary winding of the transformer, and clamp diodes to clamp the voltage generated by the tertiary winding with the use of the voltage source. The clamp diodes provide voltage-clamped signals to drive the synchronous rectifiers.

REFERENCES:
patent: 5991171 (1999-11-01), Cheng
patent: 3159261 (2001-02-01), None
U.S. Appl. No. 11/302,184, filed Dec. 14, 2005, Tsuruya et al.
U.S. Appl. No. 11/320,640, filed Dec. 30, 2005, Aso et al.
U.S. Appl. No. 11/355,166, filed Feb. 16, 2006, Aso et al.
U.S. Appl. No. 11/357,161, filed Feb. 21, 2006, Aso et al.
U.S. Appl. No. 11/369,871, filed Mar. 8, 2006, Aso et al.

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