Clamp circuit for a power converter and method of operation ther

Details Clamp circuit for a power converter and method of operation ther Clamp circuit for a power converter and method of operation ther

1998-04-28

1999-03-16

Nguyen, Matthew

Electric power conversion systems

Current conversion

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

H02H 3335

Patent

active

058837957

ABSTRACT:
For use with a power converter couplable to a source of electrical power and having a power switch coupled to a primary and tertiary winding of a transformer, the power switch capable of impressing an input voltage (Vin) across the primary winding and a duty cycle (D) of the power switch limited by a voltage applied to reset the transformer, a clamp circuit and method of increasing an efficiency of the power converter. In one embodiment, the clamp circuit includes: (1) first and second storage devices coupled between the primary and tertiary windings and (2) a switching circuit, coupled between the first and second storage devices, that selectively couples the first and second storage devices in a parallel configuration when the power switch is conducting and in a series configuration when the power switch is not conducting, thereby increasing the voltage to reset the transformer and increasing the duty cycle (D) to improve an efficiency of the power converter.

REFERENCES:
patent: 5471376 (1995-11-01), Tsai et al.
patent: 5598324 (1997-01-01), Imamura et al.
patent: 5602724 (1997-02-01), Balakrishnan
patent: 5734563 (1998-03-01), Shinada
"Analysis and Design of R-C-D Clamp Forward Converter" by C.S. Leu. G.C. Hua and F.C. Lee--VPEC. Virginia Tech. Blacksburg. VA; C.Zhou--Delta Power Electronics Lab. Inc. Blacksburg. VA; pp. 113-118.
"A Novel Lossless Snubber Circuit" by Lj. Dj. Varga and N.A. Losic; 1989 IEEE; pp. 40-45.
"Analysis of a Resonant Reset Condition for a Single-Ended Forward Converter" by Naoki Murakami and Mikio Yamasaki; Apr. 1988; pp. 1018-1023.
"Design Techniques for Transformer Active Reset Circuits at High Frequencies and Power Levels" by Bruce Carsten; May 1990; pp. 235-246.

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