| 摘要 |
In a reverse-bias control circuit for a voltage-driven switching element which turns on upon receiving a forward-bias voltage and turns off upon receiving a reverse-bias voltage, a step-down circuit is included which serves for stepping down a reverse-bias voltage after a time delay which is substantially equal to the turn-off delay of the voltage-driven switching element. The control circuit further includes a recovery circuit for stopping operation of the step-down circuit after a delay which is substantially equal to the total turn-off time of the voltage-driven switching element. The reverse-bias control circuit serves to reduce the reverse-bias voltage, thereby blocking surge-voltage disturbances, without increasing the turn-off delay time.
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