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Driving LED's

  • US 20120154260A1
  • Filed: 09/02/2010
  • Published: 06/21/2012
  • Est. Priority Date: 09/09/2009
  • Status: Abandoned Application
First Claim
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1. A drive circuit (DR) for driving a plurality of LED strings (DS1, DS2;

  • DS10) each comprising at least one LED (Di), the drive circuit comprises;

    a resonance inductor (K1),a plurality of branches each comprising a series arrangement of a resonance capacitor (C31, C32;

    C34, C35) and an associated one of the plurality of LED strings (DS1, DS2;

    DS10), the resonance capacitor (C31, C32;

    C34, C35) being arranged between the resonance inductor (K1) and its associated one of the plurality of LED strings (DS1, DS2;

    DS10) for receiving a resonance voltage (VAC) from the resonance inductor (K1),wherein a level and frequency of the resonance voltage (VAC) and an impedance of the resonance capacitor (C31, C32;

    C34, C35) are selected for supplying a LED current (IL1, IL2;

    IL10) through the associated one of the plurality of LED strings (DS1, DS2;

    DS10) being substantially independent on a tolerance on forward voltages of LED'"'"'s of the associated one of the plurality of LED strings (DS1, DS2;

    DS10).

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