基于双输出Boost变换器的高亮LED驱动研究  

HB-LED Driver Based on Dual-output Boost Converter

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：《电力电子技术》2011年第1期18-20,共3页Power Electronics

摘　　要：提出了一种工作于断续模式(DCM)下单电感双输出恒流变换器驱动高亮LED的方法。为避免变换器两路输出的交叉影响,应用时分复用理论,由时分复用信号决定两路输出中相应输出支路的调节,实现每一条输出支路电流的独立调节,从而可使每路分别驱动不同类型的LED;驱动器其中一路故障不影响另一支路的正常输出,提高了驱动器的可靠性。由于该方法只用到一个电感即可实现两路输出,进而降低了驱动器的成本。通过建立小信号模型,验证了系统的稳定性。最后通过实验验证了该方法的正确性和有效性。High-brightness light emitting diode（HB-LED） driver based on single-inductor dual-output constant current sources Boost converter operating in discontinuous-conduction mode（DCM） is proposed.To avoid cross-regulation of two outputs of Boost converter,time-multiplexing scheme is used to determine which output is controlled in the time interval of time-multiplexing signal.Output current of each output could be regulated independently,this enables dif-ferent output to constructed using different types of LED strings,and the failure of one channel does not affect the normal output of other channels,improving drive reliability.The cost of the driver is reduced by using only one induc-tor.Small-signal model is established to verify the stability of the driver.Finally,the experimental results are presented to describe and verify the proposed technique.

关 键 词：变换器 发光二极管 峰值电流型控制 时分复用 

分 类 号：TM46[电气工程—电器]