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Illumination device and method for determining a target lumens that can be safely produced by an illumination device at a present temperature

  • US 9,237,612 B1
  • Filed: 01/26/2015
  • Issued: 01/12/2016
  • Est. Priority Date: 01/26/2015
  • Status: Active Grant
First Claim
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1. An illumination device, comprising:

  • a plurality of light emitting diode (LED) chains configured to produce illumination for the illumination device at a chromaticity consistent with a chromaticity setting and at a brightness consistent with a brightness setting;

    a driver circuit coupled for generating and supplying a respective drive current to each of the plurality of LED chains for producing the illumination;

    a plurality of power converters coupled for supplying power to the driver circuit, wherein the power converters each comprise a maximum safe current level or a maximum safe power level, which varies with temperature;

    a temperature sensor coupled for measuring a present temperature associated with the power converters; and

    a control circuit configured for determining a target lumens value that is safely producible by all LED chains at the present temperature to achieve the chromaticity setting without exceeding the maximum safe current level or the maximum safe power level associated with the power converters at the present temperature.

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