Over-current protection circuits for power transistors

Details Over-current protection circuits for power transistors Over-current protection circuits for power transistors

1981-02-25

1982-03-23

Eisenzopf, Reinhard J.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

330207P, H02H 902

Patent

active

043216480

ABSTRACT:
A protected transistor in an electronic circuit receives base drive current and has its collector-emitter path coupled to a source of collector-emitter potential and to a load. Overcurrent protection therefor is provided by a first, complementary conductivity type transistor connected base to emitter and emitter to base with the protected transistor, and thermally coupled thereto, to develop a collector current responsive to the collector-emitter current of the protected transistor. A comparator provides an overcurrent indication whenever the collector current of the first transistor exceeds a predetermined level. The overcurrent indication prevents further increase in the base drive current to the protected transistor. A further feature of the invention reduces the predetermined level in response to increasing collector-emitter potential of the protected transistor.

REFERENCES:
patent: 3668545 (1972-06-01), Von Recklinghausen
patent: 3792316 (1974-02-01), Bondini et al.
patent: 3845405 (1974-10-01), Leidich
patent: 3967207 (1976-06-01), Wheatley, Jr.
patent: 4058775 (1977-11-01), Crowle
patent: 4074334 (1978-02-01), D'Arrigio et al.
patent: 4078207 (1978-03-01), Leidich
patent: 4157513 (1979-06-01), Ghiringhelli et al.
patent: 4225897 (1980-09-01), Kaplan
D. Rawson-Harris, "Variable Current-Limiting Supply", Wireless World, Jan. 1980, p. 73.
R. Dobkin, "IC with Load Protection Simulates Power Transistor", Electronics, Feb. 7, 1974, pp. 119-123.
Data Sheet, CA 2002, RCA Linear Integrated Circuits, RCA Solid State, Nov. 1978, pp. 314-315.

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