High power-factor control circuit and method for switched mode power supply
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United States of America Patent
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Aug 18, 2015
Grant Date -
Mar 8, 2012
app pub date -
Mar 17, 2011
filing date -
Sep 6, 2010
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Abstract
A switch mode power supply (SMPS) system includes a rectifying circuit for coupling to an AC input voltage and a transformer having a primary winding for coupling to the rectifying circuit and a secondary winding coupled to the primary winding. The system also has a power switch coupled to the primary winding and a control circuit coupled to the power switch. The control circuit is configured to control current flow in the primary winding such that an envelop waveform formed by peak points of current pulses are in phase with the magnitude of the AC input voltage. Moreover, the SMPS system is configured to provide a constant average output current.
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