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LED lamp system

  • US 9,204,504 B2
  • Filed: 09/17/2012
  • Issued: 12/01/2015
  • Est. Priority Date: 09/17/2012
  • Status: Expired
First Claim
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1. An LED lamp system designed to fit into a fluorescent lamp fixture and to utilize a fluorescent lamp power supply contained in the fluorescent lamp fixture;

  • the fluorescent lamp power supply receiving power from AC mains and having a ballast condition that can be at least either a two-wire magnetic ballast or a three-wire magnetic ballast;

    the LED lamp system including an LED driver arrangement which comprises;

    a) a power factor corrected driver circuit for presenting a power factor to the AC mains of at least about 0.8 when either a two-wire magnetic ballast or a three-wire magnetic ballast is present in the fluorescent lamp power supply; and

    b) a logic and electrical condition current control circuit, responsive to the presence of a three-wire magnetic ballast in the fluorescent lamp power supply for increasing an LED operating current above a nominal rated LED operating current and to a level sufficient to achieve power factor of the LED driver arrangement of at least about 0.8;

    c) wherein the two-wire magnetic ballast is configured so that;

    i) first and second conductors from a power source applying a potential therebetween are respectively coupled directly to a first end of said LED lamp system and to a first terminal of the two-wire magnetic ballast;

    ii) said LED lamp system receives power from said first conductor and from a third conductor connected between a second terminal of the two-wire magnetic ballast and a second end of said LED system; and

    iii) said lamp system has a power factor greater than 0.8 when operated from a two-wire magnetic ballast; and

    d) wherein the three-wire magnetic ballast is configured so that;

    i) first and second conductors from a power source applying a voltage potential therebetween are respectively coupled directly to two terminals of the three-wire magnetic ballast;

    ii) said LED lamp system receives power from said first conductor at a first end of said LED lamp system and from a third conductor at a second end of said LED lamp system connected to a further terminal of the three-wire magnetic ballast;

    iii) when powering a fluorescent lamp, said three-wire ballast attains a power factor of greater than 0.8; and

    iv) said lamp system has a power factor below 0.8 when the LED operating current is at the nominal rated LED operating current.

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