Protective circuit for a switching circuit

Abstract

Abstract 1. A circuit for the protection of a switching circuit, comprising at least two series connected resistors (R1 , R4 ), the first one (R1 ) having a fixed value and constituting a first series branch whereas the second one (R4 ) varies with the temperature according to a positive temperature coefficient and constitutes a second series branch, and comprising an element which varies with the voltage and is connected to the common point of the first and the second series branch so as to constitute a parallel branch, characterized in that said element which varies with the voltage is a third resistor (R2 ), that the terminals of the first series branch and of the parallel branch are intended to receive the outputs of said switching circuit, that the terminals of the second series branch and of the parallel branch are intended to receive a charge (RC ) and that said resistor (R4 ) whic varies with the temperature is disposed close to at least one of the remaining resistors (R1 , R2 ) so that the last mentioned resistor (R1 , R2 ) lowers the thermal response time of the second resistor (R4 ) by heating.

Inventors

• 👤 Gérard Blangeard
• 👤 Jean-Claude Bulte
• 👤 Raymond Lerault

Bibliographic Details