Snubber circuit for a power converter and method of operation th

Details Snubber circuit for a power converter and method of operation th Snubber circuit for a power converter and method of operation th

1998-01-22

1999-07-13

Berhane, Adolf Deneke

Electric power conversion systems

Current conversion

Including automatic or integral protection means

363 44, 363132, H02M 7125

Patent

active

059235470

ABSTRACT:
For use with a power converter having a switching circuit coupled to a primary winding of a transformer and a rectifier coupled to a secondary winding of the transformer, the switching circuit exhibiting switching losses and the rectifier inducing reverse recovery currents in the converter, a snubber circuit and a method of reducing the switching losses and reverse recovery currents. In one embodiment, the snubber circuit includes (1) a clamping capacitor coupled to the secondary winding, (2) a first clamping diode coupled to the rectifier that diverts the reverse recovery currents to the clamping capacitor and (3) an auxiliary switch that creates a path to discharge leakage inductance in the transformer to facilitate substantially zero current turn-off of the switching circuit and recover the energy stored in the clamping capacitor to an output of the converter, the auxiliary switch, clamping diode and clamping capacitor cooperating to reduce the switching losses and reverse recovery currents in the converter.

REFERENCES:
patent: 5038267 (1991-08-01), De Doncker et al.
patent: 5184291 (1993-02-01), Crowe et al.
patent: 5736842 (1998-04-01), Jovanovic

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