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Sensing and control for dimmable electronic ballast

  • US 20020101193A1
  • Filed: 12/07/2000
  • Published: 08/01/2002
  • Est. Priority Date: 12/07/2000
  • Status: Active Grant
First Claim
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1. A method for controlling a triac dimmable gas discharge lamp ballast, comprising:

  • sensing a duty cycle of a triac dimmer output waveform;

    producing a set point signal having a value corresponding to the sensed duty cycle; and

    controlling lamp current in response to the set point signal.

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