Circuit and method for protecting power components against forwa

Details Circuit and method for protecting power components against forwa Circuit and method for protecting power components against forwa

1993-07-07

1995-11-07

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific voltage responsive fault sensor

361 56, H02H 904, G05F 326

Patent

active

054651905

ABSTRACT:
A circuit protects a power transistor of the vertical MOS or IGTB-type during the off state against forward overvoltages. The protection circuit includes a first circuit for limiting the voltage across the transistor to a predetermined voltage, lower than the forward breakdown voltage of the power transistor, a circuit for detecting the quantity of energy dissipated in the transistor when the first circuit is enabled, and a second circuit for turning the transistor on at low impedance. The second circuit is enabled when the detection circuit has detected that the dissipated energy has exceeded a predetermined energy threshold.

REFERENCES:
patent: 4589049 (1986-05-01), Krumrein
patent: 4860152 (1989-08-01), Osborn
patent: 4890185 (1989-12-01), Karl et al.

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