Protecting circuit

Details Protecting circuit Protecting circuit

1979-06-26

1981-03-24

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

330298, 330207P, H02H 720

Patent

active

042584060

ABSTRACT:
A first resistor and a second resistor are connected in series across the collector and emitter of a transistor that is to be protected thereby to detect a voltage across the collector and emitter thereof, as well as to detect a collector current or an emitter current thereof, and a third resistor is connected to be collector or the emitter of the transistor that is to be protected. A detector transistor is driven by a voltage produced across the second and third transistors. A fourth resistor is connected between the collector and the base of the detector transistor, one end of the fourth resistor connected to the base of the detector transistor being connected to a constant-current circuit, and the other end of the fourth resistor connected to the collector of the detector transistor being connected to the base of a control transistor. The emitter of the control transistor is connected to the collector or the emitter of the transistor that is to be protected via the third resistor. The collector of the control transistor directly or indirectly controls the base current of the transistor that is to be protected.

REFERENCES:
patent: 3786364 (1974-01-01), Wheatley, Jr.
patent: 4074334 (1978-02-01), D'Arrigo et al.
patent: 4157513 (1979-06-01), Ghiringhelli et al.

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