DRIVER CIRCUIT FOR LIGHT SHEET MODULE WITH DIRECT CONNECTION TO POWER SOURCE
First Claim
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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Accused Products
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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Citations
18 Claims
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1. A light sheet module comprising:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method for powering a light sheet that comprises separately controllable pluralities of LEDs, the method comprising:
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providing a TRIAC connected between an external AC power source and each separately controllable plurality of LEDs; and providing trigger signals to each TRIAC to modulate the flow of current through each TRIAC to the respective separately controllable plurality of LEDs to attain a target current through, and resulting output from, each respective separately controllable plurality of LEDs. - View Dependent Claims (15, 16, 17, 18)
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Specification