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Dimmable light source with temperature shift

  • US 9,041,306 B2
  • Filed: 02/15/2010
  • Issued: 05/26/2015
  • Est. Priority Date: 02/20/2009
  • Status: Expired due to Fees
First Claim
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1. An illumination device, comprising:

  • input terminals of the illumination device for coupling to AC mains;

    a light emitting diode (LED) string connected in series with the input terminals of the illumination device;

    a rectifier, having input terminals which are connected in series with the LED string and the input terminals of the illumination device, and having output terminals;

    a controllable voltage source, having input terminals coupled to the rectifier output terminals, and having output terminals; and

    a series arrangement of at least one auxiliary LED and an auxiliary ballast resistor connected across the output terminals of the controllable voltage source.

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