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Inductively-powered gas discharge lamp circuit

  • US 7,592,753 B2
  • Filed: 01/08/2007
  • Issued: 09/22/2009
  • Est. Priority Date: 06/21/1999
  • Status: Expired due to Fees
First Claim
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1. An inductive power supply system for an inductively powered gas discharge lamp assembly comprising:

  • a primary having a tank circuit operable at a pre-heat frequency and an operating frequency, said primary having a resonant frequency controller for selectively varying a resonant frequency of said tank circuit;

    a lamp having a first electrode and a second electrode spaced apart within a gas;

    a secondary coil electrically connected to said first electrode and said second electrode;

    a first capacitor connected in series between said first electrode and said second electrode; and

    wherein said first capacitor has characteristics selected such that an electrical flow path through said first capacitor has a lesser impedance than an electrical flow path through said gas when power is applied to the secondary circuit at a pre-heat frequency, and such that said electrical flow path through said first capacitor has a greater impedance than said electrical flow path through said gas when power is applied to the secondary circuit at an operating frequency.

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