Switching power supply apparatus
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United States of America Patent
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Sep 2, 2014
Grant Date -
Apr 19, 2012
app pub date -
Oct 10, 2011
filing date -
Oct 10, 2011
priority date (Note) -
Withdrawn
status (Latency Note)
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Abstract
A switching power supply is provided to supply an AC input voltage. The supply includes a control circuit configured to detect a voltage of the AC power source in a voltage waveform, and switch elements in a synchronous rectification switching mode in synchronization with polarities of the voltage waveform when the AC input voltage is equal to or greater than a predetermined voltage value. The control unit also operates the switching without synchronization with the polarities when the AC input voltage is smaller than the predetermined voltage value.
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