基于LLC谐振变换器的LED混合调光控制策略研究  

Research on LED Hybrid Dimming Control Strategy Based on LLC Resonant Converter

作　　者：陈加勇 毛行奎[1] CHEN Jiayong;MAO Xingkui(School of electrical engineering and automation,Fuzhou University,Fuzhou 350108,China)

机构地区：[1]福州大学电气工程与自动化学院,福建福州350108

出　　处：《电器与能效管理技术》2023年第5期37-40,共4页Electrical & Energy Management Technology

基　　金：国家自然科学基金项目(51207025,52107183)。

摘　　要：为实现大功率LED驱动电源宽范围调光,需要解决LLC谐振变换器轻载下增益失调问题。结合恒定频率变占空比非对称脉宽调制(APWM)控制的LLC谐振变换器存在可以降压控制区域的特点,提出分段混合控制新型调光策略。重载时,LLC谐振变换器采用脉冲频率调制(PFM)控制;轻载时,LLC谐振变换器则采用占空比小于0.5的APWM控制。搭建了一台额定输出功率1440 W,输出电压30~48 V的大功率LED驱动电源样机,实验表明样机调光范围宽、调光速度快,轻载时电流纹波小、工作稳定,验证了所提策略的正确有效性。In order to achieve wide range dimming of high power LED driver power supplies,the gain offset problem of LLC resonant converters under light load needs to be solved.A novel segmented hybrid control dimming strategy is proposed,which combines the characteristics of the LLC resonant converter controlled by the constant frequency variable duty cycle asymmetric pulse width modulation(APWM)with the voltage reduction control region.When heavy load,pulse frequence modulation(PFM)control is adopted for LLC resonant converter.When light load,APFM control with duty cycle less than 0.5 is adopted for LLC resonant converter.A high power LED driving power supply prototype with a rated output power of 1440 W and an output voltage of 30~48 V is built.The experiments show that the prototype had a wide dimming range,fast dimming speed,small current ripple at light load,and stable work,which can verify the correct effectiveness of the new strategy.

关 键 词：LED调光 非对称脉宽调制 分段混合控制 脉冲频率调制 

分 类 号：TM46[电气工程—电器]