Overcurrent protection circuit for power transistor

Details Overcurrent protection circuit for power transistor Overcurrent protection circuit for power transistor

1979-01-29

1980-09-30

Salce, Patrick R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

330207P, 361 93, H02H 720

Patent

active

042258979

ABSTRACT:
No current sensing resistor is used for sensing overcurrent condition in a power transistor in the disclosed overcurrent protection circuit, avoiding the power loss and reduction of available output potential range for the power transistor associated with the use of such sensing resistor. Instead, a differential comparator means is used to sense when the emitter-to-base potential of the power transistor exceeds that of a reference transistor sufficiently to indicate an overcurrent condition in the power transistor.

REFERENCES:
patent: 3924159 (1975-12-01), Hoover
patent: 3967207 (1976-06-01), Wheatley, Jr.
patent: 4058775 (1977-11-01), Crowle
patent: 4078207 (1978-03-01), Leidich

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