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DRIVER CIRCUIT FOR LIGHT SHEET MODULE WITH DIRECT CONNECTION TO POWER SOURCE

  • US 20090267523A1
  • Filed: 04/23/2009
  • Published: 10/29/2009
  • Est. Priority Date: 04/24/2008
  • Status: Abandoned Application
First Claim
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1. A light sheet module comprising:

  • a light sheet having a separately controllable pluralities of LEDs on a substrate;

    a driver circuit for the pluralities of LEDs, the driver circuit comprising a first control loop and a second control loop,the first control loop comprising TRIACS for regulating current from an external AC power source to the LEDs in response to trigger signals, a constant current circuit for receiving a command signal indicative of a target current in the LEDs and for generating trigger signals to cause the TRIACs to provide current to the LEDs from the external AC power source, and current feedback circuitry for generating a current feedback signal indicative of the actual current in the LEDs, wherein the constant current circuit is responsive to the current feedback circuitry to adjust the trigger signals so that the actual current in the LEDs more closely approaches the target current; and

    the second control loop comprising a driver controller configured to generate the command signal for the constant current circuit and being responsive to at least one input device for the Driver controller.

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