Circuit to improve light load power factor of power supply
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United States of America Patent
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Feb 25, 2014
Grant Date -
Apr 7, 2011
app pub date -
Oct 1, 2010
filing date -
Oct 1, 2009
priority date (Note) -
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Abstract
A circuit to improve the power factor of a power supply at light load, the circuit including a rectifier bridge, a filter positioned before or after the rectifier bridge, a logic control and power drive circuit, a switching transistor, a light load detecting circuit configured to output a control signal to the logic control and power drive circuit which controls the switching transistor to conduct when a heavy load is experienced and to cut off when a light load is experienced, in order to control the working status of the filter capacitor, and a power factor correction circuit.
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