Phase synchronization circuit for AC voltage
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United States of America Patent
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Aug 18, 2015
Grant Date -
Sep 12, 2013
app pub date -
Jun 28, 2012
filing date -
Jun 29, 2011
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Abstract
A phase synchronization circuit for AC voltage includes an optical phase detection unit that outputs a phase detection signal by detecting an externally provided first AC voltage; a power failure detection unit that outputs a power failure signal by detecting the power failure condition of the first AC voltage; a control unit that selectively activates a selection signal according to the control of the power failure detection signal and outputs a phase control signal according to the control of the phase detection signal; a second AC voltage generation unit that generates a second AC voltage to have the same phase of the first AC voltage when outputting a second AC voltage according to the control of the phase control signal; and a selection unit that outputs either the first AC voltage or the second AC voltage according to the control of the selection signal.
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