集成反激式无电解电容LED 驱动电源

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关键词：LED驱动电源；反激变换器；无电解电容；纹波抑制；高功率因数；两开关DOI：10.15938/j. emc. 2025.06.009中图分类号：TM46 文献标志码：A 文章编号：1007-449X（2025）06-0080-10

Integrated flyback electrolytic capacitor-less LED driver

CHEN Wanyi， LIN Guoqing （Fujian Key Laboratoryof NewEnergy Generationand Power Conversion，Fuzhou University，Fuzhou 35Ol16，China）

Abstract：To address the issues of reduced lifespan and compromised reliability in LED driver power supplies caused by electrolytic capacitors，an integrated flyback two-switch electrolytic capacitor-less LED driver circuit topology was proposed，which integrates a flyback converter，a Buck-Boost converter and a Buck converter，simplifies the circuit structure，and achieves a high power factor，low frequency of the output current ripple suppression and constant current control. The Buck-Boost converter was used to transfer the excess energy from the AC side to the storage capacitor of the auxiliary circuit，and the Buck converter was used to compensate forthe insufficient energy on the output side，which balances the difference between the input alternating power and the output power，and reduces the capacity of the storage capacitor，thus allowing the circuit to be electrolytic capacitor-less by using small-capacity film capacitors instead of electrolytic capacitors. The working principle of the proposed circuit topology was analysed in detail，the control strategy applicable to this topology was proposed，and the design method of the main parameters of the circuit was given. Finally，a 36W experimental prototype was fabricated to verify effectiveness of the proposed circuit topology and its control strategy.

Keywords：LED driver power supply； flyback converter; electrolytic capacitor-less； ripple suppression;high power factor; two-switch

0引言

与传统电光源（如白炽灯、荧光灯）相比，发光二极管（light emitting diode，LED）具有低功耗、长寿命以及色彩多样等显著优势，在照明市场上占据了主导地位[1-2]。（剩余11202字）