大功率LED无源均流驱动电源的研究

Research on Passive Average-current Driving Power for High Power LED

分析了大功率LED的特性和电容均流原理,提出了一种使用市电的大功率多组LED无源均流驱动电源的电路方案。在Matlab环境下,对该电路进行了仿真实验。实验结果表明,在多路LED负载因个别短路或断路原因发生负载变化时,各LED串之间能重新合理分配电流,并且电路具有效率高、成本低、控制简单的优点,适合用于大功率多组LED串并联连结方式。

This paper analyzes the characteristics of high power LED and the principle of capacitor average- current, and puts forward a circuit scheme of passive average-current driving supply for group of high power LEDs by using electric mains. Under the Matlab surroundings, a simulation experiment has been done on the circuit and the results prove that each LED can be redistributed reasonably when the multiple LED load changes, such as sudden individual short circuit or broken. This circuit has many advantages, such as great efficiency, lower cost and easy control, and it is suitable for series parallel connection of high power multi- group LEDs.