大功率LED热阻测试系统的开发

LED照明已成为21世纪最引人注目的新技术领域之一,其中的大功率LED更是能适应普通照明领域的需要。然而结温和热阻制约着大功率LED的发展。大功率LED热阻测试技术的开发有利于LED在散热技术上的完善,有助于大功率LED实现迅速发展和更为广泛地应用。本文叙述了利用动态电学测试方法测量大功率LED热阻和结温的原理、测量方法,并基于此开发了热阻测试系统SHU-THERM-1。通过对比实验,证明本热阻测试系统能实现对单个大功率LED稳态热阻的自动且准确测量,精度较高,稳定性好。

Testing system for thermal resistance of high-power LED

LED lighting is one of the most attractive new techniques in the new century,and high-power LED is regarded as the compatible device for conventional lighting.However,the junction temperature and thermal resistance restrict the development of high-power LED.The study on measurement of thermal resistance of high-power LED can improve the deep understanding of LED thermal dispersion and to develop high-power LED fast and wildly.The principle and procedure based on the electrical measurement method for thermal resistance and junction temperature of high-power LED are described.Then,the testing system for thermal resistance,SHU-THERM-1,has been prototyped.Compared with commercial equipments,the experimental results show that the testing system can determine steady-state thermal resistance of single high-power LED with high precision and good stability.