中文摘要：

驱动电源是发光二极管（light-emitting diode,LED）照明的重要组成部分。针对因电解电容自身特性导致的驱动电源寿命与LED的长寿命不匹配这一问题,提出了一种有源纹波补偿降压（BUCK）型拓扑结构。该拓扑充分结合了开关电源和线性电源的特点,用辅助有源电路补偿电感纹波电流来取代传统电解电容滤波。文中详细分析了该拓扑的结构组成及工作原理,并且通过仿真和实验验证了该拓扑的结构有效性。理论分析和实验结果均表明,采用有源纹波补偿的拓扑结构可将电感纹波电流完全补偿,使得电路输出为直流。

英文摘要：

Power supply is an important component of LED lighting.Considering the power supply＇s lifespan didn＇t match LED＇s long lifespan by the electrolytic capacitor＇s own feature,we propose a step-down transformer topology structure of active ripple compensation based on BUCK circuit.This topology took full advantage of the characteristics of switching power supplies and linear power supplies to replace the traditional electrolytic capacitor filter with the auxiliary active circuitry compensation inductor ripple current.We analyzed the structure and the operation principle of the new topology and confirmed the validity of the new topology.The theoretical analysis and experimental results show that using the topological structure of active ripple compensation can completely compensate inductance＇s ripple current,so that the circuit output is DC.