Reverse-bias control circuit for a voltage-driven switching elem

Details Reverse-bias control circuit for a voltage-driven switching elem Reverse-bias control circuit for a voltage-driven switching elem

1992-11-09

1994-02-15

Heyman, John S.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307571, 307268, 307595, 307246, H03K 17687, H03K 1728

Patent

active

052870235

ABSTRACT:
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.

REFERENCES:
patent: 4461966 (1984-07-01), Hebenstreit
patent: 4581542 (1986-04-01), Steigerwald
patent: 4967101 (1990-10-01), Nakamura et al.
patent: 4970420 (1990-11-01), Billings

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