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Lighting device for electric discharge lamp

  • US 5,083,065 A
  • Filed: 10/19/1990
  • Issued: 01/21/1992
  • Est. Priority Date: 10/23/1989
  • Status: Expired due to Fees
First Claim
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1. A method of starting an electric discharge lamp bulb until the electric discharge lamp bulb assumes a predetermined discharge stable state, comprising the steps of:

  • supplying electric power to the electric discharge lamp bulb;

    detecting a terminal voltage across the electric discharge lamp bulb;

    determining whether said terminal voltage is greater than a predetermined value;

    increasing a frequency of said electric power by a first frequency value when it is determined that said terminal voltage is greater than said predetermined value; and

    increasing said frequency of said electric power by a second frequency value when it is determined that said terminal voltage fails to be greater than said predetermined value.

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