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DRIVER FOR PROVIDING VARIABLE POWER TO A LED ARRAY

  • US 20110175543A1
  • Filed: 09/02/2009
  • Published: 07/21/2011
  • Est. Priority Date: 09/25/2008
  • Status: Active Grant
First Claim
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1. A driver for providing variable power to at least one LED array when coupled through a phase-modulating dimmer to an AC power supply, the driver comprising:

  • a filtering and rectifying unit for attenuating electromagnetic interference from/to the AC power supply and converting an AC power from the AC power supply into a DC power output;

    a switching power unit for receiving the DC power output from the filtering and rectifying unit and providing an output current to the LED array; and

    a control unit for determining the output current to the LED array in response to a comparison between a dim reference signal representing phase-modulating information of the AC power when the phase angle of the AC power is cut by the phase-modulating dimmer and a feedback signal representing an average value of the output current to the LED array.

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