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

H - Electricity

02

M

321/27, 321/55

H02M 1/08 (2006.01) H02M 3/335 (2006.01) H02M 7/537 (2006.01) H03K 17/0424 (2006.01) H03K 17/60 (2006.01)

Patent

CA 1061862

POWER SWITCHING CONTROL CIRCUIT WITH ENHANCED TURN-OFF DRIVE ABSTRACT A transformer-coupled power switching device con- trol arrangement utilizes an active feedback energy source connected to the primary of the coupling transformer to en- hance 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 out- put 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.

253522

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