Integrated start-up circuit with reduced power consumption
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United States of America Patent
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Jun 14, 2005
Grant Date -
Mar 10, 2005
app pub date -
Sep 4, 2003
filing date -
Sep 4, 2003
priority date (Note) -
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Abstract
A switching power supply control-circuit according to the present invention uses bleeding resistors to charge a start-up capacitor and discharge an EMI filter. No extra discharge device is needed to accelerate the discharge of the input capacitor, since the start-up capacitor is charged up by the AC input source. A latch circuit of the power supply can be quickly reset after the AC input source is shut off. After the control-circuit begins to operate, the auxiliary winding of the transformer will power the control-circuit. To further reduce power consumption, the auxiliary winding generates a bias voltage to enable line-voltage detection. This allows the power supply to perform line-voltage detection and startup, without having to connect resistors or transistors to the input capacitor.
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