Protective circuit for a switching transistor

Details Protective circuit for a switching transistor Protective circuit for a switching transistor

1983-04-06

1985-06-25

Salce, Patrick R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific voltage responsive fault sensor

361 86, 361 98, 361 89, 330207P, H02H 326

Patent

active

045257655

ABSTRACT:
A protective circuit for a switching transistor is disclosed in which the base-emitter voltage of the switching transistor is compared in a comparator with a reference voltage. If the collector current of the switching transistor increases, the base-emitter voltage also increases, with the base current remaining constant. As soon as the base-emitter voltage exceeds the reference voltage, a signal is delivered at the output of the comparator. A switching-off device for switching off the driving pulses of the switching transistor responds to this signal so that a switching-on pulse present at the base of the switching transistor is switched off. The reference voltage is fixed so that the switching transistor is protected against overload by excessively large collector currents.

REFERENCES:
patent: 3600695 (1971-08-01), Krausser
patent: 3801894 (1974-04-01), Spiegel
patent: 3840820 (1974-10-01), Kawada
patent: 3904979 (1975-09-01), Suzuki
patent: 4374364 (1983-02-01), Hemery et al.
patent: 4423457 (1983-12-01), Brajder
Elektronik, 1980, No. 25, pp. 46 & 47.
IBM Technical Disclosure Bulletin, vol. 18, No. 10, 3/76, pp. 3236 and 3237.

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