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Electronic ballast drawing sinusoidal line current

  • US 5,469,028 A
  • Filed: 06/22/1992
  • Issued: 11/21/1995
  • Est. Priority Date: 03/20/1978
  • Status: Expired due to Term
First Claim
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1. An arrangement comprising:

  • an ordinary electric utility power line providing an AC power line voltage at a pair of power line terminals; and

    an electronic ballast having input terminals connected with the power line terminals and output terminals connected in circuit with a gas discharge lamp;

    the electronic ballast being characterized by;

    (i) including pre-conditioning circuitry functional to cause a substantially sinusoidal current to be drawn from the power line terminals;

    (ii) having other circuitry operative to provide a high-frequency current from its output terminals, the high-frequency current having a fundamental frequency several times higher than that of the AC power line voltage; and

    (iii) including yet additional electronic circuitry connected with its input terminals and operative to provide a substantially constant DC voltage at a pair of DC terminals, the absolute magnitude of the DC voltage being substantially equal to the absolute peak magnitude of the AC power line voltage, the DC terminals being connected with an inverter circuit disposed within the electronic ballast and operative to cause the provision of said high-frequency current.

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