Circuit for reducing transistor stress and resetting the transfo

Details Circuit for reducing transistor stress and resetting the transfo Circuit for reducing transistor stress and resetting the transfo

1986-06-11

1988-07-26

Beha, Jr., William H.

Electric power conversion systems

Current conversion

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

363 56, 363131, H02M 3335

Patent

active

047605120

ABSTRACT:
A single ended forward converter includes a snubber/reset circuit that diverts current flow from the power switching transistor during the turn off transition to significantly reduce switching loss therein. This same circuit is further operative to resonate energy stored in the magnetizing inductance of the power transformer with a capacitor during a nonconducting period of the power switching transistor in order to reverse the polarity of current, in the magnetizing inductor and reset the core, and further obtain bipolar flux excursions in the transformer core during each cycle of operation.

REFERENCES:
patent: 4268898 (1981-05-01), Brown
patent: 4365171 (1982-12-01), Archer
patent: 4441146 (1984-04-01), Vinciarelli
patent: 4561046 (1985-12-01), Kuster
patent: 4626980 (1986-12-01), McGuire
patent: 4652809 (1987-03-01), Barn
Sathe, "Coupled Induction Lossless Snubber Circuit for a Transistor Switching Converter," IBM Tech. Discl. Bul., vol. 26, No. 10A, pp. 5210-5213, Mar. 1984.

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