Electric power conversion systems – Current conversion – With condition responsive means to control the output...
Patent
1994-03-24
1995-07-18
Dougherty, Thomas M.
Electric power conversion systems
Current conversion
With condition responsive means to control the output...
363 57, H02M 324
Patent
active
054347726
ABSTRACT:
A device for controlling a thyristor converter including series connected thyristors. The device includes a plurality of forward voltage detection circuits, each of which detects forward voltage of one of the thyristors and generates a forward voltage signal based on the detected forward voltage, respectively. The device includes a first circuit for generating a conduction command signal which commands the thyristor converter to conduct, and a second circuit for generating a plurality of light gate signals and a gate monitoring signal based on a plurality of modified forward voltage signals and the conduction command signal. Each of the light gate signals is applied to one of the thyristors to turn ON thereof, respectively. The device includes a first delay circuit connected to receive the gate monitoring signal for delaying the gate monitoring signal by a first predetermined time to produce a first delayed signal. The device further includes a processing circuit connected to receive the first delayed signal and a plurality of the forward voltage signals for detecting whether or not any of the plurality of forward voltage detection circuits is in a failure, for distinguishing the forward voltage detection circuit in a failure and for generating a plurality of the modified forward voltage signals based on the result of the failure detection and the distinction, thereby inhibiting the forward voltage signal of the forward voltage detection circuit in a failure from transmitting to said second circuit.
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Dougherty Thomas M.
Kabushiki Kaisha Toshiba
Nguyen Matthew V.
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