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Process for operating a switching power supply

  • US 7,309,975 B2
  • Filed: 05/15/2006
  • Issued: 12/18/2007
  • Est. Priority Date: 05/16/2005
  • Status: Expired due to Fees
First Claim
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1. A process for operating a switch-mode power factor correction (PFC) circuit connectable to a load, said circuit including a first buck switch, a second boost switch and an inductor in a buck boost circuit, said process comprising:

  • selectively applying input voltage to the PFC circuit, said input voltage being a rectified AC wave, andactivating both of said buck switch and boost switch near zero current of said inductor, while limiting ON-time of the buck switch, for accelerating discharge of said inductor,wherein the buck switch ON-time (tbuck) and boost switch ON-time (tboost), the PFC circuit input voltage (Vin) and the PFC circuit output voltage (Vo) conform with the equation;


    (tbuck=tboost)/tboost=Vin/Vo.

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