基于nI公司的lAbVIEW8.2设计了一套可控温功率lEd电参数自动测试系统,解决了仪器手动操作测量既繁琐费时又容易出错的问题,可自动测量样品在不同温度下的伏安特性,并同步显示测量数据和曲线。利用PId运算调节温度控制的精度,提高了测量结果的准确性和可靠性。并利用本系统对lEd的正向电压与温度的关系进行了实验研究,发现在恒定电流下,温度较高时正向电压与温度成反比关系,温度较低时正向电压随温度减小而突然急剧增大。A temperature controllable automated measurement system for the electrical parameter of power LED based on Labview 8.2 of National Instruments is designed.It solved the problems of the inconvenient and fallible procedure of instrument manual measurement,this system can Automatic measure the voltage-current characteristic of sample at different temperature.Using PID operation to adjust the precision of attemperation and improve the accuracy and reliability of measurement result.And experimental investigation was carried out on the relationship between the forward voltage and temperature in LEDs by this system.It is discovered that at a constant current,in the high temperature region a linear inverse relationship exists between the forward voltage and temperature;while in low temperature region,forward voltage increases drastically as the temperature decreases.福建省半导体照明工程技术研究中心开放课
