一种新型LED灯瞬态控制方法的研究

摘要

对数字LED的峰值电流控制方法进行了分析和研究，并以Buck变换器拓扑结构作为研究对象，理论分析了Buck电路的峰值电流前缘和后缘数字控制方法，仿真分析比较这两种控制方法优缺点。仿真结果表明，前缘调制比后缘调制有更快的瞬态响应速度和更小的电压跌落和过冲。最后实验揭示了前缘控制方法的瞬态特性。本文提出的LED灯峰值电流前缘控制方法对LED启动时的冲击电流起到抑制作用，对电网电压波动带来的不利因素也起到一定的稳压保护作用，提高了LED的发光率和使用寿命。%Taking Buck converter topology for the research object, this paper studies digital LED peak current control methods, and analyzes the digital control method to peak current leading and trailing edge in the Buck circuit with comparing the advantages and disadvantages of these two control methods by stimulating. The simulation results show that the leading edge modulation has faster transient response speed, and smaller voltage drop and overshoot than that of the trailing edge modulation. Eventually, the experiment shows the transient characteristics of leading edge control method to which peak current of the LED lights given in this study has an inhibitory effect on the inrush current when LED lights switches on, and also plays a protective role to stabilize the fluctuating voltage, therefore, it improves the luminous efficiency and service life of LED lights.