Zero crossing indicator device
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United States of America Patent
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Oct 10, 2017
Grant Date -
Jul 31, 2014
app pub date -
Jan 27, 2014
filing date -
Jan 28, 2013
priority date (Note) -
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Abstract
An alternating current (AC) zero-crossing indicator apparatus including a current adjusting circuit for adjusting a DC signal current for a duration of time the same as the duration of a received zero-crossing detection signal. The zero-crossing indicator apparatus additionally includes a voltage retainer for maintaining a constant DC voltage applied to a connected load during the adjusting of the DC signal current. Also included is a zero-crossing sensor for generating a zero-crossing indication signal responsive to sensing of the adjusting of the DC signal current.
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