Electric power conversion systems – Current conversion – Including automatic or integral protection means
Patent
1979-04-27
1981-04-21
Shoop, William M.
Electric power conversion systems
Current conversion
Including automatic or integral protection means
363136, 361 86, H02H 7122
Patent
active
042636469
ABSTRACT:
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 of 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 inverter 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.
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Henri Digneffe, "Characteristics and Applications of RCA Fast-Switching ASCR's", RCA Application Note AN-6456, 1/76, pp. 1-9.
General Electric Company
Lacomis Bernard J.
Reams Radford M.
Shoop William M.
Wong Peter S.
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