Protection circuit for a gate turn-off device in an electrical b

Details Protection circuit for a gate turn-off device in an electrical b Protection circuit for a gate turn-off device in an electrical b

1994-05-16

1995-07-25

Ro, Bentsu

Electricity: motive power systems

Braking

Dynamic braking

318139, 361 18, 363 50, 363124, H02P 312, H02H 7122

Patent

active

054365406

ABSTRACT:
A snubber circuit for limiting an initial voltage applied to a semiconductor switching device during transition of the switching device from a conducting to a non-conducting state includes a first circuit having a serially connected first diode and first capacitor coupled in parallel with the switching device and a second circuit having a second capacitor having a second capacitor connected between a cathode terminal of the switching device and a voltage potential less than a potential switched through the switching device and further having a second diode and a serially connected inductor coupled between the anode terminal of the switching device and the lower voltage potential. The voltage appearing at the cathode terminal of the switching device in excess of the lower voltage potential will effect a current through the inductor to limit an initial voltage rise at the cathode terminal when switching the device to a non-conducting state.

REFERENCES:
patent: 3890551 (1975-06-01), Plunkett
patent: 4093900 (1978-06-01), Plunkett
patent: 4275430 (1981-06-01), Seki et al.
patent: 4697219 (1987-09-01), Mitsuoka
patent: 4745513 (1988-05-01), McMurray
patent: 4761600 (1988-08-01), D'Atre et al.
patent: 4904918 (1990-02-01), Bailey et al.
patent: 5117166 (1992-05-01), Kumar
patent: 5208741 (1993-05-01), Kumar
patent: 5283507 (1994-02-01), Stitt et al.
patent: 5331261 (1994-07-01), Brown et al.

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