Resonant converting apparatus and control method thereof
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United States of America Patent
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Feb 27, 2018
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app pub date -
Aug 25, 2016
filing date -
Jul 13, 2016
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Abstract
A resonant converting apparatus and a control method thereof are provided. The resonant converting apparatus includes a resonant converting circuit, a load detector, a control signal generator and a pulse frequency modulation (PFM) signal generator. The resonant converting circuit converts an input voltage into an output voltage to drive a load according to a PFM signal. The load detector detects a load status of the load. The control signal generator generates the control signal according to the load status and a PFM range. When the load status is a light load status, the control signal is divided into a plurality of first time periods and second time periods which are respectively arranged alternatively. The PFM signal is maintained to a reference voltage during the second time periods, and is a periodical signal having frequency substantially equal to a resonant frequency during the first time periods.
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