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High-power factor circuit for energizing gas discharge lamps

  • US 5,374,875 A
  • Filed: 02/16/1993
  • Issued: 12/20/1994
  • Est. Priority Date: 02/16/1993
  • Status: Expired due to Fees
First Claim
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1. A circuit for powering a gas discharge lamp from a source of a first frequency AC power comprising:

  • a first rectifier for converting the first frequency AC power into a first DC power;

    a capacitor coupled to the rectifier for storing the DC power as energy;

    a driver having a driver input and a driver output, which produce an electrically symmetric output, the driver input coupled to the capacitor for converting the energy stored in the capacitor into a second frequency AC power;

    a second rectifier having a second rectifier input and a second rectifier output, the second rectifier input coupled to the inverter output for converting some of the second frequency AC power into a second DC power;

    voltage control means for adjusting the voltage of the second frequency AC power at the input of the second rectifier; and

    impedance control means for controlling the impedance of the second rectifier.

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