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LED Light Sources with Improved Thermal Compensation

  • US 20110068715A1
  • Filed: 10/01/2010
  • Published: 03/24/2011
  • Est. Priority Date: 10/01/2010
  • Status: Active Grant
First Claim
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1. A compound light source that generates light of a design intensity at a design temperature in response to a drive current flowing through said light source, said light source comprising:

  • a primary light source;

    a compensating light source, said primary and compensating light sources converting an electrical current passing therethrough to light, each light source being characterized by an electrical conversion efficiency that decreases with increasing temperature and that also decreases with increasing current;

    a temperature sensor that measures a temperature of said primary light source; and

    a current splitting circuit that divides said drive current between said primary and compensating light sources in response to said measured temperature to compensate for said decrease in efficiency of said primary light source with temperature changes above said design temperature.

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