Short circuit current limiter

Details Short circuit current limiter Short circuit current limiter

1987-03-24

1988-10-18

Wan, Gene

Amplifiers

With semiconductor amplifying device

Including protection means

330207P, 361101, H02H 720

Patent

active

047790628

ABSTRACT:
A short circuit limiter having at least one current sink transistor connected to a trip point voltage setting resistor. The trip point voltage setting resistor receives a current which is a function of a reference current. One of the current sink transistors has a base connected above the tip point voltage setting resistor. The emitter of one of the current sink transistors sets the trip point voltage and is connected to the output transistors. If there is a short circuit in a load, the increased current will cause the voltage connection between the output transistors and the current sink transistors to rise up to the trip point voltage at which point, base drive current will be diverted away from the output transistors and through the current sink transistors.

REFERENCES:
patent: 4358812 (1982-11-01), LoCascio et al.
patent: 4413300 (1983-11-01), Sumi et al.

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