Solid state switch with integral protection for connecting a load to an electrical power supply and incorporating an isolated gate bipolar transistor
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United States of America Patent
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-
Dec 17, 1996
Issued Date -
N/A
app pub date -
Dec 4, 1995
filing date -
Jan 15, 1993
priority date (Note) -
Expired
status (Latency Note)
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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.
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