双输出单级PFC变换器的高亮LED驱动研究

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...

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

High-brightness light emitting diode(HB-LED)driver based on single-stage dual-output power factor correction(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 converter 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.