DRIVER CIRCUIT FOR LIGHT SHEET MODULE WITH DIRECT CONNECTION TO POWER SOURCE
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United States of America Patent
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N/A
Issued Date -
Oct 29, 2009
app pub date -
Apr 23, 2009
filing date -
Apr 24, 2008
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A light sheet module includes a light sheet having LEDs on a substrate and a driver circuit for the LEDs. The driver circuit includes a first control loop and a second control loop. The first loop contains TRIACS for regulating current from an external AC power source to the LEDs in response to trigger signals. A constant current circuit receives a command signal indicative of a target current in the LEDs, and generates the trigger signals. Current feedback circuitry generates a current feedback signal indicative of the actual current in the LEDs. The constant current circuit responds to the current feedback circuitry and adjusts the trigger signals so that the actual current in the LEDs more closely approaches the target current. The second control loop contains a Driver controller that generates the command signal and that is responsive to an input device for the Driver controller.
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