Parallel-tuned electronic ballast

  • US 5,189,342 A
  • Filed: 02/25/1992
  • Issued: 02/23/1993
  • Est. Priority Date: 10/05/1984
  • Status: Expired due to Term
First Claim
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1. A ballast for a gas discharge lamp, comprising:

  • a source operative, between a first and a second DC output terminal, to provide a DC voltage of substantially constant magnitude; and

    inverter-type power supply connected with the DC output terminals and operative to provide a high-frequency AC voltage between a first inverter output terminal and an inverter reference terminal;

    the high-frequency AC voltage being of a certain magnitude and a certain frequency;

    the certain frequency being substantially higher than the frequency of the power line voltage on an ordinary electric utility power line;

    the power supply including a tuned L-C circuit connected with the first inverter output terminal and the inverter reference terminal;

    the L-C circuit having a tank capacitor parallel-connected with a tank inductor and being resonant at or near said certain frequency;

    any high-frequency voltage existing between the inverter reference terminal and the first DC output terminal being of magnitude negligible in comparison with said certain magnitude.

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