无电解电容LED驱动电源恒流及纹波控制

Constant current and ripple control of LED driver without electrolytic capacitor

当传统未连负载的升压-降压LED驱动电源具有高功率因数时,它就会产生明显的低频纹波电流。基于降压-升压拓扑结构,提出了一种具有创新型的LED驱动电源技术。该技术在不影响功率因数性能的条件下大大降低了低频纹波电流,并且还保留了传统升压-降压LED驱动电源高效率、低成本的优点。最后,通过一个10 W、50 V-0.2 A的实验原型来验证这种新型技术的性能。

When the traditional unloaded boost-buck LED driver power supply has a high power factor,it will produce significant low-frequency ripple current.Based on the buck-boost topology,this paper presents an innovative LED drive power technology.This technology greatly reduces the low-frequency ripple current without affecting the performance of the power factor,and the advantages of high efficiency and low cost of the traditional boost-buck LED driver power supply are also preserved.Finally,a 10 W,50 V-0.2 A experimental prototype is used to verify the performance of this new technology.