Low-frequency high-efficacy electronic ballast

  • US 5,710,488 A
  • Filed: 03/23/1992
  • Issued: 01/20/1998
  • Est. Priority Date: 12/22/1986
  • Status: Expired due to Term
First Claim
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1. An arrangement comprising:

  • a source operative to provide an AC voltage at a pair of AC terminals; and

    a circuit connected with the AC terminals and operable to power a gas discharge lamp;

    the circuit being characterized by;

    (i) providing a conditioned voltage at a pair of terminals; and

    (ii) including a transistor conducting intermittently at a time-varying switching frequency, thereby to maintain the absolute magnitude of the conditioned voltage substantially constant.

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