Optically isolated line voltage sensing circuit
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United States of America Patent
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Sep 28, 1999
Grant Date -
N/A
app pub date -
Sep 6, 1996
filing date -
Sep 6, 1996
priority date (Note) -
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Abstract
A linear optocoupler is employed to provide a signal which is a galvanically isolated reproduction of the magnitude of an A.C. line voltage and another galvanically isolated signal indicative of a change in the polarity of the line voltage for enabling safe monitoring of a change the A.C. voltage. Actuation of an automatic transfer switch to substitute an emergency source of power for a normal source that has failed may be achieved with the emergency power waveform used to replicate the normal power waveform.
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