基于混沌扩频无损吸收的共模EMI抑制方法  

A method for CM EMI suppression based on chaotic spread spectrum and lossless snubber

作　　者：樊玮丰 李国进[1] 陈延明[1] FAN Weifeng;LI Guojin;CHEN Yanming(School of Electrical Engineering,Guangxi University,Nanning 530004,China)

机构地区：[1]广西大学电气工程学院,广西南宁530004

出　　处：《广西大学学报（自然科学版）》2023年第2期384-392,共9页Journal of Guangxi University（Natural Science Edition）

基　　金：国家自然科学基金项目(51567004);广西创新驱动发展专项(AE30200032)

摘　　要：针对高频开关电源电磁干扰过大的问题,提出一种无损吸收与混沌扩频结合的共模传导电磁干扰(electromagnetic interference,EMI)抑制方法。无损吸收电路把吸收电容的能量回馈电源或者传送给负载,提高变换电路的效率,并且其吸收电容的取值可以比常规的吸收电容更大,可以更好地抑制d u/d t;混沌扩频技术可以使EMI频谱均匀化,减小噪声峰值,是进一步抑制共模EMI的重要和有效的手段。采用Boost功率因数校正(power factor correction,PFC)变换器作为分析对象,研究混沌扩频无损吸收的共模EMI抑制效果,首先建立无损吸收PFC变换器的共模EMI等效模型,然后基于该模型推导了混沌扩频调制下的功率谱密度函数,并进行仿真分析,最后搭建了实验样机,进行相关的EMI测试。实验结果表明:混沌扩频无损吸收能有效降低PFC变换器的共模EMI。Aiming at the problems of electromagnetic-interference(EMI)by high-frequency switching power supplies,a method of lossless snubber and chaotic spread spectrum was used to suppress common-mode(CM)EMI.The lossless snubber circuit can feed energy of snubber capacitor back to power supply or to the load.This improves the efficiency of converter.The value of its snubber capacitance can be larger than that of conventional snubber capacitance,which can better reduce d u/d t.Chaotic spread spectrum can make EMI spectrum more uniform and reduce EMI peak value.It is an important and effective method to further suppress CM EMI.It takes Boost PFC converter as an example to study the effect of suppressing CM EMI by chaotic spread spectrum and lossless snubber.Firstly,the CM EMI equivalent model of PFC converter was established with lossless snubber.Then the power spectral density function was derived under chaotic spread spectrum modulation and verified by simulation results.Finally,a prototype was built for relevant EMI testing.The experimental results show that the combination of chaotic spread spectrum and lossless snubber can effectively suppress CM EMI.

关 键 词：功率因数校正变换器 无损吸收 混沌扩频 共模噪声 功率谱密度 

分 类 号：TM46[电气工程—电器]