基于双输出反激变换器的高亮LED驱动研究

HB-LED driver based on dual-output flyback converter

针对LED灯输出电流恒定的工作特性,提出了DC/DC变换器电感电流工作在断续模式(DCM)下的双输出反激变换器驱动LED的控制方法。分析了两路LED灯负载的工作过程,用一个磁性元件实现LED灯两路控制器恒流输出。通过建立小信号模型可知两路LED灯驱动器能实现各支路电流输出恒定;仿真分析可知系统的稳态、动态和高频干扰抑制能力达到很好的效果;通过实验验证了所提出的拓扑电路结构和控制方法的可行性。

According to the working characteristic of LED light constant output current,the dual-output flyback converter LED driver control method of DC/DC converter inductor current in discontinuous-conduction mode （DCM） was proposed.The working process of two-channel LED lamp load was analyzed,using a magnetic part to realize the constant current output of LED lamp two-channel controllers.The small signal model was built,and two-channel LED lamp drivers can achieve the constant output of each branch current,The simulation analysis shows that the steady,dynamic and high frequency interference suppression ability of the system can achieve good effects; the experiments verify the feasibility of the topology structure and control method of the proposed circuit.