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LED drive for generating constant light output

  • US 7,019,662 B2
  • Filed: 07/29/2003
  • Issued: 03/28/2006
  • Est. Priority Date: 07/29/2003
  • Status: Active Grant
First Claim
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1. A power supply for a light emitting diode (LED) light source, comprising:

  • an LED power converter adapted to receive power from a power source and to generate an output power signal that can be applied to an LED light source having an effective operating lifetime and an effective light output; and

    an LED power controller connected to the LED power converter and adapted to control the output power signal so that it compensates for degradations in the effective light output of the LED light source and ensures that light output by the LED light source when it is connected to the LED power converter remains relatively constant over the effective operating lifetime of the LED light source,wherein the LED power converter is further adapted to;

    receive a low frequency ac power signal;

    convert the low frequency ac power signal into a dc power signal;

    convert the dc power signal into a high frequency ac power signal; and

    convert the high frequency ac power signal into the output power signal.

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