采用光谱参数表征白色LED结温  

Characterization of White LED Junction Temperature by Spectral Parameters

作　　者：饶丰[1] 吴峰[1] 扈罗全[2] 周芝凯 吴涛[1] 张旭金 张燕[1] 

机构地区：[1]常州工学院电气与光电工程学院,江苏常州213002 [2]苏州出入境检验检疫局,江苏苏州215021

出　　处：《中国照明电器》2017年第9期1-6,共6页China Light & Lighting

基　　金：江苏省高校优秀中青年教师和校长境外研修计划;江苏省前瞻性科技项目(BY2016031-05)

摘　　要：提出了一种利用质心波长联合半高全宽表征白色LED结温的新方法。首先搭建LED光谱分布测试平台,在忽略脉冲电流热效应的前提下测量在不同环境温度、不同窄脉冲电流下LED的光谱分布。再根据光谱分布计算出质心波长和半高全宽。接着获得双光谱参数与温度和驱动电流的关系曲线图,然后利用实际点灯时的光谱数据,结合关系曲线图,估算出对应的结温。最后考虑脉冲电流的热效应,利用电流-结温修正系数,对先前估算的结温进行修正,得到更加精确的LED结温。研究表明,一般地,LED电流-结温修正系数为-4^-6℃/A,平均为-5℃/A。与正向电压法相比,本设计采用的方法测得的结温最大误差为2.3℃,最小误差为0.8℃,平均误差为1.6℃。因此,采用质心波长联合半高全宽这种非接触型测量方法表征白色LED结温准确可靠。A new method of determining the junction temperature of white LED based on the centroid wavelength and FWHM was developed. Firstly, a platform of measuring LED spectral distributions with different ambient temperatures and different narrow pulsed currents was constructed, and then the centroid wavelength and FWHM were obtained with the measured spectra. The relationships among the two spectral parameters, ambient temperature and driven current were obtained, and then the junction temperature was estimated from the spectral data under real operating conditions. Finally, considering the thermal effect of the pulsed currents, the previously estimated junction temperature was corrected by related formulas with the current-junction temperature correction coefficient of LED and the more accurate junction temperature was obtained. The results show that the current-junction temperature correction coefficients were from - 4 to - 6 ℃/A, with an average of - 5 ℃/A. Compared with the junction temperature measured with forward voltage method, the maximum error of junction temperature of the established method was 2. 3 ℃, the minimum and the average error were 0. 8℃ and 1. 6 ℃, respectively. Therefore, the non-contact method with the centroid wavelength and FWHM can measure the white LEDs＇junction temperatures accurately.

关 键 词：结温 光谱分布 质心波长 半高全宽 

分 类 号：TN312.8[电子电信—物理电子学]