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Apparatus and methods for the thermal regulation of light emitting diodes in signage

  • US 20090013570A1
  • Filed: 04/10/2008
  • Published: 01/15/2009
  • Est. Priority Date: 04/10/2007
  • Status: Active Grant
First Claim
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1. A channel sign comprising:

  • a channel sign housing having a sign cavity therein;

    a power distribution circuit disposed within the channel sign; and

    a plurality of LED modules disposed within the channel sign cavity, wherein each of the LED modules is electrically coupled to the power distribution circuit and comprises;

    at least one LED intended for operation within a normal temperature range;

    a driver circuit coupled to the LED for supplying current thereto;

    a control circuit coupled to the driver for regulating the current from the driver to the LED; and

    a temperature sensor coupled to the control circuit and mounted on the LED module for furnishing a temperature signal to the control circuit indicative of ambient temperature about the LED;

    wherein the control circuit is responsive to the temperature signal for reducing or cutting off current from the driver circuit to the LED when the ambient temperature exceeds the normal temperature range.

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