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LED assembly, LED fixture, control method and software program

  • US 8,618,737 B2
  • Filed: 03/12/2009
  • Issued: 12/31/2013
  • Est. Priority Date: 03/17/2008
  • Status: Active Grant
First Claim
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1. A light-emitting diode (LED) assembly comprising:

  • a plurality of LEDs arranged in groups, each group comprising at least one LED,a control circuit for driving the LEDs, the control circuit comprising a sensing device for sensing an operative parameter of the LEDs, said operative parameter comprising a forward voltage;

    the control circuit being arranged to;

    a) operate at least two of the groups of the LEDs simultaneously with each other;

    b) sense by the sensing device a total value of the operative parameter of the at least two groups;

    c) repeat a) and b)for at least a different combination of at least two of the groups;

    d) determine the operative parameter for each of the at least two groups from the sensed total values of the operative parameter;

    e) assign to each of the groups of LEDs a value of the operative parameter from the determined operative parameter values;

    f) estimate a temperature of each of the LED groups based on the assigned value of the operative parameter; and

    g) control the driving of the groups of LEDs from the assigned operative parameter values by using the estimated temperature.

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