Solid state switch with integral protection for connecting a loa

Details Solid state switch with integral protection for connecting a loa Solid state switch with integral protection for connecting a loa

1995-12-04

1996-12-17

Gaffin, Jeffrey A.

Electricity: electrical systems and devices

Safety and protection of systems and devices

With specific current responsive fault sensor

361 18, A02H 300

Patent

active

055859933

ABSTRACT:
A solid-state switch is connected in series with a load between the poles of an electrical power supply. It includes an isolated gate bipolar transistor with an emitter connected to the internal ground and connected to the load and a collector connected to one pole of the supply and driving an input of a subtractor the other input of which is connected to receive a set point voltage. The output of the subtractor drives a feedback system connected to the gate of the transistor. The voltage at the gate is then representative of the current in the switch and is applied to interrupter means which sends a turn-off signal if the gate voltage exceeds a (triggering) threshold value. The turn-off signal sends to a switching circuit a turn-off voltage which produces a turn-off bias and disables the feedback circuit.

REFERENCES:
patent: 4065804 (1977-12-01), Rostad
patent: 4297741 (1981-10-01), Howell
patent: 4371824 (1983-02-01), Gritter

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