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Led Lighting Device

  • US 20080303452A1
  • Filed: 12/12/2006
  • Published: 12/11/2008
  • Est. Priority Date: 12/13/2005
  • Status: Active Grant
First Claim
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1. A LED lighting device comprising at least a first and a second LED (15,17;

  • 33,31) supplied by a switched mode power supply (8;

    49), wherein the current through the first LED (15;

    33) is controlled by a first bypass switch (19;

    41), connected in parallel with the first LED, the current through the second LED (17;

    31) is controlled by a second bypass switch (21;

    39), connected in parallel with the second LED, the first and second LEDs being connected in series between the switched mode power supply and a first constant current source (25;

    47), and wherein the switched mode power supply is arranged to supply a number of different output voltages (Vout) depending on the state of the first and second bypass switches, such that the voltage depends on the number of LEDs emitting light.

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