基于滑模控制的LED恒流电源研究

发光二极管(LED)由于发光效率高、寿命长等优点在照明领域得到了越来越多的研究,但其伏安特性的非线性和温度敏感性为LED的高性能控制带来了难度。本文基于Boost变换器,提出了一种应用于LED照明系统恒流电源的新型滑模控制(SMC)方法,建立了新的滑模面函数,无需非线性负载的复杂模型。采用PSIM软件进行仿真,在实际50W光伏LED照明系统中进行了实验,将SMC与常规电流反馈PI控制方法进行了对比研究。仿真和实验结果表明在LED照明系统中采用本文提出的SMC方法,具有算法简单、动态响应快、鲁棒性好等优点。

Research on constant current source for LED based on sliding mode control

Light-Emitting Diode(LED) has been widely investigated in lighting systems for its advantages of high luminous efficiency,long lifetime and so on.However,it is difficult to control LED with high performances due to its characteristics of nonlinearity and temperature sensitivity.A novel method of sliding mode control(SMC) for LED lighting system based on boost converter with constant current source is proposed in this paper.A new sliding surface is established,which eliminates the complicated model of nonlinear load.Simulations have been conducted using PSIM software;and based on that,a 50W photovoltaic LED lighting system has been developed to implement a serial of comparative experiments.The results show that the designed system with SMC exhibits several advantages,such as simple algorithm,excellent robust and dynamic performances.