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Circuit for dimming compact fluorescent lamps

  • US 5,173,643 A
  • Filed: 06/25/1990
  • Issued: 12/22/1992
  • Est. Priority Date: 06/25/1990
  • Status: Expired due to Term
First Claim
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1. An electromagnetic circuit for providing power from an ac source to a pair of series connected gas discharge lamps mounted in a grounded fixture, comprising:

  • (a) a ferromagnetic core;

    (b) a primary winding having at least one turn electromagnetically coupled to said core and electrically connected to said ac source;

    (c) a secondary winding having a plurality of turns electromagnetically coupled to said core and said primary winding and electrically connected across said pair of gas discharge lamps in series; and

    (d) a center tap electrically dividing said secondary winding into first and second portions, said center tap being electrically connected to said grounded fixture;

    whereby the electrical potentials of said lamps to a ground plane of said grounded fixture are approximately equal.

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