Thyristor valve with improved gate pulse generating scheme
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United States of America Patent
Stats
-
Aug 7, 1990
Grant Date -
N/A
app pub date -
Mar 17, 1988
filing date -
Mar 19, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A thyristor valve circuit protected having an arrester to protect it from an overvoltage. The circuit includes a voltage detector for detecting a forward voltage level applied to the thyristor valve and generating a signal sVp when the detected voltage level exceeds a predetermined voltage which is set lower than the protection level of the arrester, and a circuit for generating a gate pulse applied to the thyristor valve in response to the signal sVp* from the voltage detector. The gate pulse generating circuit permits the gate pulse to be applied to the thyristor only when the condition of the presence of conduction command signal PHS and forward voltage signal FV, and the absence of output signal sVp* of the voltage detector, is satisfied.
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