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Circuits and methods for driving LED light sources

  • US 9,030,122 B2
  • Filed: 02/09/2012
  • Issued: 05/12/2015
  • Est. Priority Date: 12/12/2008
  • Status: Active Grant
First Claim
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1. A driving circuit for controlling power of a light-emitting diode (LED) light source, said driving circuit comprising:

  • a transformer having a primary winding that receives input power from an AC/DC converter and having a secondary winding that provides output power to said LED light source;

    a switch controller, coupled between an optical coupler and said primary winding, that receives a feedback signal indicative of a target level of a current flowing through said LED light source from said optical coupler, and that controls input power to said primary winding according to said feedback signal; and

    a dimming controller, coupled to said secondary winding, that receives a switch monitoring signal indicative of an operation of a power switch coupled between an AC power source and said AC/DC converter, and that regulates said output power of said transformer by adjusting said feedback signal according to said switch monitoring signal.

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