Lossless snubber circuit

Details Lossless snubber circuit Lossless snubber circuit

1989-12-11

1991-05-07

Stephan, Steven L.

Electric power conversion systems

Current conversion

Including automatic or integral protection means

361 90, 361 91, 361111, 363 98, H02H 7122

Patent

active

050141805

ABSTRACT:
A snubber circuit for a power switch includes a capacitor coupled across main current path electrodes of the switch, an inductor having a first end coupled to one of the main current path electrodes of the power switch and a second end and a controllable switch having a first main current path electrode coupled to the second end of the inductor, a second main current path electrode coupled to the other main current path electrode of the power switch and a control electrode. A control circuit is coupled to the power switch and the controllable switch and turns on the controllable switch when a gating signal is commanding turn-on of the power switch and the voltage across the main current path electrodes of the power switch is above a certain level so that the capacitor is discharged through the inductor at such time. The control circuit subsequently turns off the controllable switch and turns on the power switch while the gating signal is commanding turn-on of the latter switch when the voltage across the main current path electrodes thereof falls below the certain level.

REFERENCES:
patent: 4438486 (1984-03-01), Ferraro
patent: 4502085 (1985-02-01), Morrison et al.
patent: 4566059 (1986-01-01), Gallios et al.
patent: 4607322 (1986-08-01), Henderson
patent: 4626980 (1986-12-01), McGuire
patent: 4639849 (1987-01-01), Noworolski et al.
patent: 4691270 (1987-10-01), Pruitt

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