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Light emitting diode multiphase driver circuit and method

DC CAFC
  • US 7,081,722 B1
  • Filed: 02/04/2005
  • Issued: 07/25/2006
  • Est. Priority Date: 02/04/2005
  • Status: Active Grant
First Claim
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1. A method for driving light emitting diodes (LEDs) in multiphase, comprising:

  • providing a string of LEDs divided into groups, said groups of LEDs being electrically connected to each other in series;

    providing a power source electrically connected to the string of LEDs;

    separately coupling each of the groups to a ground through separate conductive paths;

    providing a phase switch in each of the separate conductive paths;

    increasing an input voltage from the power source to turn on the LEDs, group by group in a sequence downstream the string.

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