基于COT模式的THD补偿方法研究  

Research on THD Compensation Method Based on COT Mode

作　　者：陆杰 李田丰 

机构地区：[1]上海理工大学机械工程学院,上海

出　　处：《建模与仿真》2021年第3期843-854,共12页Modeling and Simulation

摘　　要：近年来,在照明应用的领域中,LED以其高效率、节能的特点掀开了人类照明历史上的崭新篇章,随着人们对LED越来越高的应用要求,LED驱动器逐渐成为LED发展的瓶颈,与此同时分次谐波或总谐波失真已经成为定义LED驱动器性能的非常重要的指标之一。针对LED驱动器领域中总谐波失真严重而引起的污染和效率等问题,本文提出了两种补偿电路,此电路在传统恒导通时间控制模式的基础上,对决定LED输出电流的采样电阻上的电压进行采集并分别转换为电压和电流补偿。通过Mathcad软件计算以及Simplis仿真分析以及实验验证表明,此补偿方法可优化总谐波失真。在220 V AC输入电压时,总谐波失真可达到小于10%的效果。In recent years, in the field of lighting application, LED has opened a new chapter in the history of human lighting with its high efficiency and energy saving characteristics. With the increasing ap-plication requirements of LED, the performance requirements of LED drivers have gradually developed into the bottleneck of LED. The fractional harmonic or Total Harmonic Distortion (THD) has become one of the most important indicators to define the performance of LED drivers. In order to solve the pollution and efficiency problems caused by the serious total harmonic distortion in the field of LED driver, two compensation circuits are proposed in this paper. Based on the tradi-tional constant-on-time control mode, this circuit collects the voltage on the sampling resistance which determines the output current of the LED and converts it into voltage and current compensation respectively. The results of Mathcad software calculation, Simplis simulation analysis and ex-perimental verification show that this compensation method can optimize the total harmonic dis-tortion. At the input voltage of 220 VAC, the THD can be less than 10%.

关 键 词：总谐波失真 恒导通模式 电压型补偿 电流型补偿 

分 类 号：TM9[电气工程—电力电子与电力传动]