Overvoltage protection circuit for electronic circuit - has FET preventing destruction due to supply failure or incorrect turn-off

摘要

The protection circuit has a controlled semiconductor connected by its main current path between circuit points prone to be subjected to overvoltages. These points are formed by a point lying at the reference potential of the circuit being protected and by one input (3) of the circuit (5) being protected. The semiconductor's (2) control input (14) is connected to the circuit's (5) supply. The semiconductor may be an n or p channel FET. A resistor (15) is connected between the FET's gate and the reference potential.