Control circuit for improving efficiency of lower load of power supply device and method thereof
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United States of America Patent
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Issued Date -
Dec 31, 2009
app pub date -
Jun 26, 2008
filing date -
Jun 26, 2008
priority date (Note) -
Abandoned
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Abstract
In a control circuit and a method for improving the efficiency of a lower load of a power supply device, the power supply device includes power stages, for inputting an input power to the power supply device and producing an output power to drive a load; a control circuit electrically coupled to the power stages for detecting a drive load and issuing a control signal for turning on/off one of the power stages. The control method includes: setting a predetermined output load value by a control circuit; detecting a total output load of the power stages by the control circuit; comparing the total output load with the predetermined output load value; and turning on/off one of the power stages by the control circuit according to a comparison result. The invention reduces the loss of power stages at a low load to enhance the power saving effect and the economic efficiency.
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