Overcurrent protection circuit for power transistors

Details Overcurrent protection circuit for power transistors Overcurrent protection circuit for power transistors

1985-12-09

1987-07-14

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific voltage responsive fault sensor

361101, 363 56, H02H 304

Patent

active

046806644

ABSTRACT:
A protection circuit for a power transistor cuts off the transistor if an overcurrent condition occurs. The protection circuit includes control transistors that are switched on and off to alternately supply positive voltage to the base of the power transistor to turn it on and negative voltage to turn it off. A control circuit provides signals to the control transistors to turn them on and off. A latch has an input connected across the collector and emitter of the power transistor for monitoring the voltage. If the voltage exceeds a threshold level at the latch, the latch will provide a disabling output to the control circuit to turn off the power transistor.

REFERENCES:
patent: 4158866 (1979-06-01), Baker
patent: 4375074 (1983-02-01), Glogolja
patent: 4467258 (1984-08-01), Leuthen
patent: 4491892 (1985-01-01), Lehmann et al.
patent: 4504899 (1985-03-01), Jessee
patent: 4589051 (1986-05-01), Santurtun
The Power Transistor in its Environment, p. 120.

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