Electronic power overload protection circuit

Details Electronic power overload protection circuit Electronic power overload protection circuit

1983-09-08

1986-01-14

Salce, Patrick R.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361 88, 361101, 361 79, 330207P, H02H 720

Patent

active

045648794

ABSTRACT:
A protection circuit for a push-pull amplifier includes two sensing transistors arranged in respective feedback circuits. The output signals of such sensing transistors, which are indicative of the output voltage, are used to limit the output current of the amplifier in such a manner that the output current is limited to a first threshold decreasing with a steeper slope as a function of the output voltage of the amplifier between predetermined two output voltage values, and a second threshold decreasing with increasing output voltage at a lesser slope above the higher one of the two predetermined output voltage values. This characteristic response can be overridden by appropriate circuitry so long as the temperature of the amplifier is below a predetermined maximum value, so as to make the output current threshold independent of the output voltage.

REFERENCES:
patent: 3835412 (1974-09-01), Honda et al.
patent: 3946280 (1976-03-01), Quist
patent: 4375074 (1983-02-01), Glogolja

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