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Estimation of Junction Temperature of LED Based on Its Series Resistance
Author(s): 
Pages: 45-48
Year: Issue:  5
Journal: Optics & Optoelectronic Technology

Keyword:  light emitting diodejunction temperature measuringforward voltage methodseries resistanceI/V curvesemiconductor measurement technology;
Abstract: The relations between the current/voltage (I/V) characteristics and the junction temperature of LEDs are analyzed.The effects of temperature-dependent series resistance on the I/V curves is revealed.Based on the effects,a method of measuring LED junction temperature is proposed.By measuring several data of current/voltage of an LED on working condition,and then processing the data,the junction temperature can be estimated.Using this method,6 sets of LED lamps are measured.The results are agreed with the traditional method,which confirmes the feasibility of the method.
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