LED power control methods and apparatus

  • US 7,737,643 B2
  • Filed: 07/20/2007
  • Issued: 06/15/2010
  • Est. Priority Date: 03/15/2004
  • Status: Active Grant
First Claim
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1. An apparatus comprising:

  • at least one first white LED configured to generate first radiation having a first spectrum that includes perceivably white light; and

    a first feed-forward driver coupled to the at least one first white LED and configured to controllably vary a first intensity of the first radiation without monitoring or regulating a first voltage or a first current provided to the at least one first white LED,wherein the first feed-forward driver comprises an energy transfer arrangement including;

    at least one energy transfer element to store input energy derived from a power source and to provide output energy to the at least one first white LED;

    at least one switch coupled to the at least one energy transfer element to control at least the input energy stored to the at least one energy transfer element; and

    at least one diode,wherein the energy transfer arrangement is configured as one of a buck converter, a boost converter, a buck-boost converter, a CUK converter, a flyback converter and a forward converter.

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