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Method and device for remote sensing and control of LED lights

  • US 8,358,085 B2
  • Filed: 01/06/2010
  • Issued: 01/22/2013
  • Est. Priority Date: 01/13/2009
  • Status: Active Grant
First Claim
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1. A method for determining a temperature of at least one light emitting diode (LED) in a circuit which includes a power supply for powering the LED, where the LED is operable to generate light, the method comprising:

  • providing an operating current and an operating voltage to the LED;

    superimposing a first current pulse on the operating current;

    sensing a magnitude of a first voltage pulse across the LED resulting from the applied first current pulse superimposed on the operating current;

    superimposing at least a second current pulse, different from the first current pulse, on the operating current;

    sensing a magnitude of a second voltage pulse across the LED resulting from the applied second current pulse superimposed on the operating current;

    deriving an operating temperature curve utilizing (i) logarithms of magnitudes of the first and second current pulses and (ii) magnitudes of the first and second voltage pulses;

    determining a slope of the operating temperature curve; and

    determining an operating temperature of the LED based on the determined slope of the operating temperature curve.

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