Overload protection circuit for a semiconductor switch

Details Overload protection circuit for a semiconductor switch Overload protection circuit for a semiconductor switch

1982-01-29

1983-12-27

Moose, Jr., Harry E.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific quantity comparison means

361 91, 361 98, H02H 326

Patent

active

044234570

ABSTRACT:
An overload protection circuit for a semiconductor switch has a control line which can be shorted, via the collector-emitter path of a transistor, to the ground. The base of the transistor is connected to the output of a comparison stage. One input of the comparison stage is connected via a resistor to the control line, via a diode to the lead of the semiconductor switch facing away from the ground potential, and via a capacitor to ground. A fixed reference voltage is applied to the second input of the comparator stage.
In this circuit, a control pulse is shorted as soon as the voltage across the semiconductor switch exceeds a given value because of overcurrent. The short circuit of the addressing pulse is cancelled again as soon as the latter goes back to zero.

REFERENCES:
patent: 3449598 (1979-06-01), Wright et al.
patent: 3924158 (1975-12-01), Farnsworth
patent: 4355341 (1982-10-01), Kaplan
patent: 4363068 (1982-12-01), Burns
"Elektronik-Selbstbaupraktikum", 4th Edition, 1976 p. 292, by Wirsum.
Etz-b, vol. 30 (1978), No. 26, p. 1065.
"Current and Power Limiter Protects Switching Transistor" Electronics, vol. 40, No. 12, Jun. 12, 1975 by Stitt.

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