Circuit for protecting a power transistor against a short-circui

Details Circuit for protecting a power transistor against a short-circui Circuit for protecting a power transistor against a short-circui

1985-04-03

1987-09-01

Pellinen, A. D.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Load shunting by fault responsive means

361 91, 323315, H02H 902

Patent

active

046912622

ABSTRACT:
An integrated circuit includes an NPN power transistor and a short-circuit-protection circuit which includes a voltage divider connected directly across the base and emitter of the power transistor. The voltage divider is a series circuit branch having two resistors and a diode connected in the polarity to turn on when the power transistor is on. A smaller NPN transistor has a base-emitter junction connected across a portion of the voltage divider, which portion includes only one of the resistors and the diode. The collector is connected to sink a bias current away from the power transistor when abnormally high currents flow in the power transistor to limit that current to a safe value.

REFERENCES:
patent: 3473106 (1969-10-01), Grabl
patent: 4322770 (1982-03-01), Sendelweck
patent: 4338646 (1982-07-01), Davis et al.

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