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SEMI RESONANT SWITCHING REGULATOR, POWER FACTOR CONTROL AND LED LIGHTING

  • US 20120169240A1
  • Filed: 07/01/2011
  • Published: 07/05/2012
  • Est. Priority Date: 07/01/2010
  • Status: Active Grant
First Claim
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1. A method of zero voltage switching for power factor control, the method comprising the steps of:

  • (a) providing a capacitor in parallel with a switching device;

    (b) detecting the polarity of the current through the capacitor; and

    (c) operating the switch responsive to a change in the polarity of the current through the capacitor.

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