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Electrical circuit with dual stage resonant circuit for igniting a gas discharge lamp

  • US 7,456,583 B2
  • Filed: 09/05/2006
  • Issued: 11/25/2008
  • Est. Priority Date: 09/05/2006
  • Status: Expired due to Fees
First Claim
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1. A circuit for igniting and operating a gas discharge lamp, the circuit comprising:

  • an inverter comprising a plurality of power switches set to operate at a first switching frequency during a lamp ignition mode to supply a variable voltage output signal; and

    a resonant circuit connected to receive the variable voltage output signal from the inverter, wherein said resonant circuit comprises a first circuit stage and a second circuit stage, and further wherein the second circuit stage includes a resonant tank circuit configured to generate a resonant output voltage when the switching frequency of the inverter matches a resonant frequency of the resonant circuit, and wherein the first circuit stage comprises at least one current-suppressing element for reducing a fluxing effect of a resonant current that flows in the resonant circuit on a switching current that flows in the inverter, said flux-reducing effect occurring when the switching frequency of the inverter matches the resonant frequency of the resonant circuit, wherein the resonant current essentially flows just through the second circuit stage.

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