一种新型两开关无电解电容LED驱动电路  

Novel Two-switch Electrolytic Capacitor-less LED Driver

作　　者：张经纬 林国庆[1] ZHANG Jingwei;LIN Guoqing(College of Electrical Engineering and Automation,Fuzhou University,Fuzhou 350108,China;CPSS)

机构地区：[1]福州大学电气工程与自动化学院,福州350108 [2]中国电源学会

出　　处：《电源学报》2024年第4期260-269,共10页Journal of Power Supply

基　　金：晋江市福大科教园区发展中心科技资助项目(2019-JJFDKY-37)。

摘　　要：LED驱动电源通常需要大电解电容来减少低频电流纹波,电解电容的短寿命是制约LED驱动电源寿命的重要因素,消除电解电容是LED驱动电源长寿命的关键。为此,提出了一种基于反激变换器的两开关无电解电容LED驱动电路拓扑,将辅助功率平衡电路与反激变换器集成,通过2个开关管实现瞬时输入功率与输出功率的平衡,消除电解电容,抑制输出电流低频纹波,实现高功率因数。详细分析了该拓扑的工作原理,并提出了一种适用于该电路拓扑的控制策略。最后搭建了1台30 W的原理样机,实验结果验证了该拓扑的可行性。The light-emitting diode( LED) driver usually needs a large electrolytic capacitor to reduce its low-frequency current ripple.Therefore,the short life of the electrolytic capacitor is an important factor restricting the life of LED driver,and eliminating the electrolytic capacitor is a key to the long-life LED driver.Under this background,a two-switch electrolytic capacitor-less LED drive circuit topology based on flyback converter is proposed.The auxiliary power balance circuit and flyback converter are integrated,and a balance between the instantaneous input power and output power is realized through two switches.The electrolytic capacitor is eliminated,the low-frequency ripple of output current is suppressed,and a high power factor is realized.The working principle of this topology is analyzed in detail,and a control strategy for its circuit topology is put forward.Finally,a 30 W prototype was built,and experimental results verified the feasibility of the proposed topology.

关 键 词：LED驱动电路 无电解电容 功率因数校正 低频纹波抑制 

分 类 号：TM46[电气工程—电器]