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Controller and method for controlling an intensity of a light emitting diode (LED) using a conventional AC dimmer

  • US 8,193,717 B2
  • Filed: 12/23/2008
  • Issued: 06/05/2012
  • Est. Priority Date: 12/24/2007
  • Status: Active Grant
First Claim
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1. A flicker-free method for using a conventional AC dimmer coupled to a main AC supply to continuously control an intensity of a Light Emitting Diode (LED) over substantially a full range of the dimmer, the method comprising:

  • providing a controllable source of DC voltage that is configured for coupling to at least one LED and that is powered independently of an output of the AC dimmer thereby isolating the LED voltage from the output of the AC dimmer; and

    coupling to the source of DC voltage a controller that is powered independently of the output of the AC dimmer and that is responsive to a firing angle of the AC dimmer for varying a level of the DC voltage as a function of said firing angle.

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