双输出单级PFC变换器的高亮LED驱动研究  

Study on single-stage dual-output PFC converter for HB-LED driver

作　　者：杨静[1] 庄圣贤[1] 刘雪山[1] 

机构地区：[1]西南交通大学电气工程学院,四川成都610031

出　　处：《电工电能新技术》2011年第4期46-49,55,共5页Advanced Technology of Electrical Engineering and Energy

基　　金：中央高校基本科研业务费专项基金(编号:SWJTU09ZT13)

摘　　要：提出了一种工作于断续模式(DCM)双输出单级反激功率因数校正(PFC)变换器驱动高亮LED的方法。为了避免变换器两路输出的交叉影响,应用时分复用方法实现了每一条输出支路电流的独立调节,提高了驱动器的可靠性;由于此方法只用到一个磁性元件即可实现两路恒流输出,进而降低了驱动器的成本;变换器工作在DCM、定频、定占空比时,可获得较高的功率因数。最后通过仿真与实验验证本文研究结果的正确性与有效性。High-brightness light emitting diode （HB-LED） driver based on single-stage dual-output power factor cor- rection （PFC） flyback converter operating in discontinuous-conduction mode （DCM） is proposed in this paper. To avoid cross-regulation of two outputs of converter and improve the reliability of the driver, time-multiplexing signal （TMS） is used to regulate each output current independently, and it enables different output to drive different types of LED strings. The failure of one output does not affect other output, improving the reliability of driver. The con- verter can achieve high power factor by working in DCM, fixed frequency and fixed duty cycle. Additionally, the converter can achieve dual-output constant current output by using only one magnetic device, and it realizes the power factor correction at the same time, thus reduces the cost of the driver. Finally, simulation and experimental results are presented to describe and verify the proposed technique.

关 键 词：双输出恒流源 独立调节 单级PFC 时分复用 

分 类 号：TM464[电气工程—电器]