H - Electricity – 02 – H
Patent
H - Electricity
02
H
321/51
H02H 7/122 (2006.01)
Patent
CA 1135333
9D RG-13455 ABSTRACT OF THE DISCLOSURE A missed commutation detection circuit for use with a power inverter circuit which employs optically isolated gates to provide signals indicative of the state of a pair of SCR power switching devices. The gates are connected to combine the signals via a NOR logic arrangement to generate a missed commutation control signal whenever both the SCR's are concurrently in a conductive or unblocked condition. The commutation control signal thus generated feeds a one-shot multivibrator which generates an isolation signal for a preselected time period. The isolation signal opens a normally closed current isolation switch connected intermediate the DC input bus and the invertor SCR's which cuts off current to the SCR's permitting them to return to their blocking state. After the duration of the isolation signal from the one shot, the isolation switch is again closed and the circuit is permitted to attempt normal operation. The inverter is again isolated from the DC supply upon recurrence of the missed commutation condition.
348739
Company General Electric
Eckersley Raymond A.
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