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Electronic reactor for the supply of discharge lamps with an oscillator circuit to limit the crest factor and to correct the power factor

  • US 5,485,060 A
  • Filed: 02/08/1995
  • Issued: 01/16/1996
  • Est. Priority Date: 02/11/1994
  • Status: Expired due to Term
First Claim
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1. Electronic reactor, or ballast, for a discharge lamp (L), comprising:

  • a bridge rectifier (5) connected to an alternating voltage source (3);

    a half-bridge with two controlled switching means (11,

         13) made alternately conducting to connect the said lamp (L) and the said bridge rectifier (5);

    a resonant load circuit (17) connected to the said half-bridge (11,

         13) and including the said lamp (L); and

    a smoothing capacitor (29) connected in parallel with the half-bridge (11,

         13);

    and wherein an auxiliary resonant circuit (33) is connected between the output (19) of the half-bridge (11,13) and the positive pole (5A) of the bridge rectifier (5).

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