Signal detecting circuit for digital controller
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United States of America Patent
Stats
-
Jan 14, 1997
Grant Date -
N/A
app pub date -
Dec 1, 1994
filing date -
Dec 9, 1993
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
An instantaneous value of alternating current signal from an instrument potential transformer 10 or an instrument current transformer 9 is processed with an analog filter 21, 22, the frequency to be used for correction being detected with a frequency detector 103, frequency correction of the gain of the detected signal being performed with a frequency corrector 104, 114 after detecting the root-mean-square value of the frequency, the corrected signal being supplied to a digital automatic voltage regulator 120. Thereby, it is possible to remove a direct current component and absorb a surge in a signal, and to correct the signal in coping with the fluctuation of the input signal to detect a stable signal.
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