摘要
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500～1000mA分别增大了14．7％、18．6％、17．6％、21．0％；驱动电流分别为500mA、720mA、l000mA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。
Abstract： This paper researched the effects of driving current and ambient temperature on thermal resistance and luminous efficacy of high power LED. The results showed that： when ambient temperature was 25℃, 55℃, 70℃and 85℃, the thermal resistance value Rjs of high power LED respectively increased 14.7%, 18.6%, 17.6% and 21.0% as the driving current increasing from 500 mA to 1,000 mA; when driving current was 500 mA, 720 mA and 1,000 mA, the thermal resistance value Rjs respectively increased 13.8%, 18.8% and 20.0% as the ambient temperature increasing from 25℃, to 85℃. This indicates that the specific driving current and ambient temperature need to be given when measuring the thermal resistance of LED. In addition, the luminous efficacy of high power LED decreases with the increase of ambient temperature and driving current, and the larger the driving current, the greater the decline in luminous efficacy. This paper provides a reference for the thermal resistance testing and design of LED.
出处
《中国照明电器》
2016年第8期12-14,23,共4页
China Light & Lighting
基金
广东省重大科技专项"标准光组件检测实验室能力建设及产品品质保障工程"(503169741044)研究内容之一
关键词
大功率LED
驱动电流
环境温度
热阻
光效
high power LED
driving current
ambient temperature
thermal resistance
luminous efficacy
