IN-CIRCUIT TEMPERATURE MEASUREMENT OF LIGHT-EMITTING DIODES
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May 25, 2012
filing date -
May 26, 2011
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Abandoned
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Abstract
Control systems and methods that directly measure the actual junction temperature of LEDs utilize internal electrical measurements, thereby dispensing with external sensors and/or wires. In various embodiments, the actual junction LED temperature is obtained based on the measured electrical properties, such as the voltage across and/or current passing through the LEDs, during operation. The measured junction temperature may be used in a closed-loop feedback configuration to control the power applied to the LED in order to avoid overheating.
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