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Power factor correction and driver circuits

  • US 7,952,293 B2
  • Filed: 04/30/2008
  • Issued: 05/31/2011
  • Est. Priority Date: 04/30/2008
  • Status: Active Grant
First Claim
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1. A lighting apparatus driver circuit comprising:

  • a driver control circuit including a driver controller;

    a comparator circuit including a comparator, wherein the comparator is connected to the driver control circuit;

    a voltage regulator including a transistor connected to the comparator circuit; and

    a diode configured to provide a return path for a current through an electrical load and inductor during the transistor switch off time;

    wherein the driver circuit regulates the current supplied to the electrical load at a nominal current plus or minus about 2%.

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