电容电流纹波控制Buck LED恒流驱动器研究  

Study on Capacitive Current Ripple-controlled Buck LED Constant Current Driver

作　　者：张留洋 徐利梅[1] 黄影 王瑶[1] ZHANG Liuyang;XU Limei;HUANG Ying;WANG Yao(College of Electrical Engineering,Southwest Minzu University,Chengdu 610041,Sichuan,China)

机构地区：[1]西南民族大学电气工程学院,四川成都610041

出　　处：《电气传动》2022年第19期39-45,59,共8页Electric Drive

基　　金：中央高校基本科研业务费专项资金优秀学生培养工程项目(2020YYXS55)。

摘　　要：为了提高Buck LED恒流驱动器的负载瞬态响应速度,提出了电容电流纹波控制(capacitive current ripple-controlled,CCRC)Buck LED恒流驱动器。基于Buck LED恒流驱动器的工作原理,采用状态空间平均法建立了其状态空间平均模型。在此基础上,结合CCRC Buck LED恒流驱动器的工作原理,建立了其小信号模型,推导了系统的控制-输出环路增益传递函数,设计了控制电路的PI补偿参数。基于伯德图,与传统电压型控制(voltage mode controlled,VMC)Buck LED恒流驱动器的负载瞬态响应速度进行了对比分析。研究结果表明:相比于VMC Buck LED恒流驱动器,CCRC Buck LED恒流驱动器的负载瞬态响应速度更快。最后,时域仿真和实验结果验证了理论分析的正确性。In order to improve the load transient response speed of Buck LED constant current driver,a capacitive current ripple-controlled(CCRC) Buck LED constant current driver was proposed. Based on the operating principle of Buck LED constant current driver,the state space averaging model of Buck LED constant current driver was established by using the state space averaging method. On this basis,combined with the operating principle of the CCRC Buck LED constant current driver,a small signal model of the driver was established. The control-output loop gain transfer function of the system was deduced,and the PI compensation parameters of the control circuit were designed. Comparing analysis with the load transient response speed of traditional voltage mode controlled(VMC)Buck LED constant current driver was presented by Bode diagram. The analysis results show that the CCRC Buck LED constant current driver has a faster load transient response speed compared with the VMC Buck LED constant current driver. Finally,the correctness of the theoretical analysis was verified by simulation and experimental results.

关 键 词：Buck LED恒流驱动器 电容电流纹波控制 小信号模型 补偿参数 瞬态响应 

分 类 号：TM46[电气工程—电器]