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Electronic ballast having timing unit correction

  • US 7,193,371 B2
  • Filed: 02/01/2005
  • Issued: 03/20/2007
  • Est. Priority Date: 02/06/2004
  • Status: Active Grant
First Claim
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1. A method for operating a light-producing apparatus, the method comprising the steps of:

  • providing an electronic ballast for powering the light-producing apparatus, the electronic ballast including an internal timing unit that includes an oscillator, the internal timing unit providing an internal timing function;

    receiving, by the electronic ballast, an external signal that contains time information;

    processing the time information of the external signal to correct the internal timing function of the electronic ballast, wherein the internal timing function of the electronic ballast is corrected by calculating and storing a correction value in dependence on the time information contained in the external signal, wherein operation of the oscillator is unaffected by the correction value; and

    controlling the light-producing apparatus in accordance with the correction value.

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