Thyristor pulse control circuits

Details Thyristor pulse control circuits Thyristor pulse control circuits

H - Electricity

02

M

323/9

H02M 5/04 (2006.01) H02H 7/12 (2006.01) H02M 3/137 (2006.01)

Patent

CA 1107818

ABSTRACT OF THE DISCLOSURE A thyristor pulse control circuit of the kind having a main thyristor and a commutation circuit including a commutating capacitor, and a by-pass contactor connected across the main thyristor, is provided with means for applying a gating signal to the main thyristor immediately before the contacts of the by-pass contactor close and also immediately before the contacts of the by-pass contactor open, to prevent arcing at the contacts. The application of the gating signal is inhibited if a comparison of the voltage across the commutating capacitor with the load current flowing immediately before the by-pass contactor closes, indicates that the load current is too great to be safely commutated by the voltage across the commutating capacitor. Thus, arcing of the contacts of the by-pass contactor is greatly reduced while, at the same time, the possibility of a failure to commutate the load current flowing through the main thyristor due to insufficient charge on the commutation capacitor is eliminated.

303262

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