采用动态差分模型表征脉冲驱动LED电热特性  

Study on Electro-thermal Characteristics of Pulse-driven LED Based on Dynamic Electric-thermal Difference Model

作　　者：郭杰[1] 饶丰 张美凤[1] 褚静[1] GUO Jie;RAO Feng;ZHANG Meifeng;CHU Jing(School of Optoelectron.Engin.,Changzhou Institute of Technol.,Changzhou 213032,CHN;School of Innovation and Entrepre.,Changzhou Institute of Technol.,Changzhou 213032,CHN)

机构地区：[1]常州工学院光电工程学院,江苏常州213032 [2]常州工学院创新创业学院,江苏常州213032

出　　处：《半导体光电》2021年第3期385-389,共5页Semiconductor Optoelectronics

基　　金：国家重点研发计划项目(2017YFF0210002);江苏省产学研合作项目(BY2020485);江苏省“333”人才项目(BRA2019157)。

摘　　要：为了研究不同驱动方式下LED结温的差异性,依据LED热结构模型,从功率传递角度构建了差分型LED电-热动态模型,利用相同平均功率、不同频率的注入电功率,计算脉冲驱动条件下的LED结温。同时,采用正向电压法测量实际结温,对模型预测结温的准确性进行了分析。研究表明,差分模型能够表征脉冲驱动方式下LED电热特性,其理论预测值与实测值误差约为4℃,基本能够满足工程应用要求。更有意义的是,采用差分模型,能够分析在特定驱动条件下,LED热容、热阻等参数对结温的影响,为不同驱动模式下LED个性化结构设计提供了理论基础。In order to study the difference of LED junction temperature under different driving modes,a difference electro-thermal dynamic model of pulse-driven LED was constructed from the perspective of power transfer according to the thermal structure model.And then,the junction temperature was calculated with injected powers which have same average power and different frequency.Lastly,the actual junction temperature was measured by forward voltage method for theoretical verification.The results show that the difference model can characterize the electro-thermal characteristics of pulse-driven LED,and the error between the predicted value and the measured value is about 4℃,which can basically meet the requirements of engineering applications.Furthermore,this model can be used to analyze the influence of LED heat capacity and thermal resistance on junction temperature under specific driving conditions,which provides a theoretical basis for LED design under different driving modes.

关 键 词：LED 结温特性 电热差分模型 脉冲驱动 

分 类 号：TN312.8[电子电信—物理电子学]