Power switching control circuit with enhanced turn-off drive

Details Power switching control circuit with enhanced turn-off drive Power switching control circuit with enhanced turn-off drive

1975-05-29

1976-10-12

Miller, Jr., Stanley D.

Electrical transmission or interconnection systems

Nonlinear reactor systems

Parametrons

307254, 307300, 307314, H03K 1700

Patent

active

039860523

ABSTRACT:
A transformer-coupled power switching device control arrangement utilizes an active feedback energy source connected to the primary of the coupling transformer to enhance the turn-off drive to the power switching device. The active feedback energy source produces an output directly dependent upon the magnitude of the power switching device output current and independent of the duration of said output current. When the output current drops to zero, the active feedback source is disabled, and a bias network is connected to the transformer primary. The bias network maintains a reverse voltage at the control electrode of the power switching device and establishes a bias current through the primary suitable for resetting the transformer core flux.

REFERENCES:
patent: 3131327 (1964-04-01), Quinn
patent: 3757144 (1973-09-01), Hetterscheid et al.
patent: 3805094 (1974-04-01), Orlando

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