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Method and apparatus for controlling minimum brightness of a flourescent lamp

  • US 6,469,922 B2
  • Filed: 09/04/2001
  • Issued: 10/22/2002
  • Est. Priority Date: 06/22/2000
  • Status: Expired due to Fees
First Claim
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1. A method of controlling the minimum brightness of a fluorescent lamp comprising the acts of:

  • supplying a sinusoidal voltage to the fluorescent lamp in periodic bursts;

    generating a count for each cycle in a sinusoidal current flowing through the fluorescent lamp in response to the sinusoidal voltage, wherein amplitudes of the respective cycles exceed a preset threshold; and

    adjusting durations of the bursts to achieve a minimum count in each burst.

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