System for detecting faulty SCR's
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United States of America Patent
Stats
-
Nov 2, 1982
Grant Date -
N/A
app pub date -
May 13, 1981
filing date -
May 13, 1981
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A safety circuit for a silicon controlled rectifier controller of the type wherein the current delivered to a load is determined by controlling the firing angle of the silicon controlled rectifiers. The safety circuit is capable of sensing a shorted condition in the silicon controlled rectifiers and automatically disconnecting the load from the AC mains in the event of such a short circuit condition. Load current is sampled at a time in the cycle where it is expected to be zero. If at the sampling time a non-zero condition is detected, a relay is made to operate to actuate a circuit breaker or to perform other desired functions.
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