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Solid State Lighting System, Apparatus and Method with Flicker Removal

  • US 20130229120A1
  • Filed: 04/17/2013
  • Published: 09/05/2013
  • Est. Priority Date: 03/05/2012
  • Status: Abandoned Application
First Claim
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1. A solid-state lighting apparatus coupleable to an AC input power source having an AC line frequency, the apparatus comprising:

  • an AC rectifier to convert an AC voltage level to a rectified voltage level;

    a plurality of light emitting diodes coupled in series to form a plurality of segments of light emitting diodes;

    a plurality of first switches correspondingly coupled to the plurality of segments of light emitting diodes to switch a selected segment of light emitting diodes into or out of a series light emitting diode current path;

    a first terminal controller coupled to the plurality of first switches to control switching of a corresponding segment of light emitting diodes into the series light emitting diode current path;

    a second switch coupled in series with each segment of light emitting diodes of the plurality of segments of light emitting diodes to control current through the series light emitting diode current path; and

    a second terminal controller coupled to the second switch, the second terminal controller to turn the second switch on and off at a switching frequency at least about four to about one thousand times greater than the AC line frequency and thereby correspondingly turn on and off the plurality of light emitting diodes at the switching frequency.

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