光学与光电技术, 2017, 15 (5): 45, 网络出版: 2017-11-07
基于LED串联电阻的结温测量方法
Estimation of Junction Temperature of LED Based on Its Series Resistance
发光二极管 结温测量 正向电压法 串联电阻 电流电压曲线 半导体测量技术 light emitting diode junction temperature measuring forward voltage method series resistance I/V curve semiconductor measurement technology
摘要
理论分析了LED的电流/电压(I/V)特性与PN结结温的关系,揭示了温度函数的串联电阻项对I/V曲线的影响,并应用这一影响提出了一种基于串联电阻测量LED结温的方法。该方法只需多点记录LED工作状态的电流、电压值,对数据进行模型拟合就可以得出LED的结温,测试仪器要求低,测量过程简单,可与LED老化工艺同步进行,是一种简单、有效的批量检测LED结温的方法。利用该方法测量了6组LED灯具,测量结果与传统正向电压法的结果具有较高的一致性,证实了该方法的可行性。
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.
张家伟, 刘一霖, 王文峰. 基于LED串联电阻的结温测量方法[J]. 光学与光电技术, 2017, 15(5): 45. ZHANG Jia-wei, LIU Yi-lin, WANG Wen-feng. Estimation of Junction Temperature of LED Based on Its Series Resistance[J]. OPTICS & OPTOELECTRONIC TECHNOLOGY, 2017, 15(5): 45.
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