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研究了驱动电流和环境温度对大功率LED的热阻以及光效的影响,研究结果显示:环境温度分别为25℃、55℃、70℃、85℃时,大功率LED热阻值Rjs从驱动电流500~1 000 m A分别增大了14.7%、18.6%、17.6%、21.0%;驱动电流分别为500 m A、720 m A、1 000 m A时,热阻值Rjs从环境温度25~85℃分别增大了13.8%、18.8%、20.0%。这表明在测量和计算LED的热阻时,需要给出具体的驱动电流和环境温度。另外,大功率LED的光效分别随环境温度和驱动电流的升高而降低,且驱动电流越大时,下降幅度越大。本文同时为LED热阻的测试和设计提供了参考。
The effects of driving current and ambient temperature on the thermal resistance and luminous efficacy of high power LEDs were studied. The results show that when the ambient temperature is 25 ℃, 55 ℃, 70 ℃ and 85 ℃ respectively, Current 500 ~ 1 000 m A increased by 14.7%, 18.6%, 17.6% and 21.0% respectively. When the driving currents were 500 m A, 720 m A and 1 000 m A respectively, the thermal resistance Rjs increased from 25 ~ 85 ℃ increased by 13.8%, 18.8% and 20.0% respectively. This indicates that the specific drive current and ambient temperature need to be given when measuring and calculating the thermal resistance of the LED. In addition, the luminous efficiency of high-power LED, respectively, with the ambient temperature and drive current decreases, and the larger the drive current, the greater the decline. This article also provides a reference for the test and design of LED thermal resistance.