| 摘要 |
A protection circuit for a semiconductor device such as a field effect transistor is disclosed having an oscillator which is connected to both the gate turn on circuitry and to the drain-source circuit of the field effect transistor for sensing the voltage of the drain-source circuit and for turning off cyclically the field effect transistor upon the simultaneous occurrence of a gate turn on signal to the gate of the transistor and high drain-source voltage.
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