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APPARATUS AND METHODS FOR DIMMING ILLUMINATION DEVICES

  • US 20120049760A1
  • Filed: 08/31/2010
  • Published: 03/01/2012
  • Est. Priority Date: 08/31/2010
  • Status: Abandoned Application
First Claim
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1. A method of dimming a plurality of LEDs, comprising:

  • generating a first pulse-width modulated (PWM) waveform;

    the first PWM waveform having a first duty cyclegenerating a plurality of second PWM waveforms;

    each of the plurality of second PWM waveforms having a duty cycle;

    starting the duty cycle of the first PWM waveform and the duty cycle of each of the second PWM waveforms at approximately the same time;

    ending the periods of each of the second PWM waveforms before the end of the first PWM iteration;

    closing and opening a first switch in response to the duty cycle of the first PWM waveform;

    closing and opening each of a plurality of second switches connected between the first switch and a corresponding plurality of LEDs;

    where each second switch is closed in response to the respective duty cycles of each second PWM waveform;

    so that each LED connected between each second switch and a power source is energized when the first switch and the corresponding second switch are closed and not energized when either the first switch or the corresponding second switch is open.

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