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
张经纬 1林国庆1
作者信息
- 1. 福州大学电气工程与自动化学院,福州 350108
- 折叠
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.
Abstract
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Key words
Light-emitting diode(LED)driver/electrolytic capacitor-less/power factor correction/low-frequency ripple suppression引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据