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四川理工学院毕业设计（论文）EMI电源滤波器设计与测试学生：学号：专业：电气工程及其自动化班级：指导教师：四川理工学院自动化与电子信息学院二OO九年六月四川理工学院毕业设计（论文）摘要本文在分析电源滤波器网络结构和软磁铁氧体性质的基础上，提出了电源滤波器插入损耗的计算方法。文中应用网络理论分析了EMI电源滤波器的插入损耗与相关网络参量的关系，讨论了EMI电源滤波器的基本网络结构及其插入损耗的计算方法，建立了单相电源滤波器的共模及差模等效电路模型及滤波器件的高频分布参数模型，然后分析了软磁铁氧体材料的主要性质，讨论了软磁铁氧体在EMI电源滤波器中的应用，建立了软磁铁氧体磁芯的等效电路模型。并根据文中所述做出了一个EMI电源滤波器实物。在本文的最后还讨论了EMI电源滤波器的一些工程应用技术。关键词:EMI电源滤波器，插入损耗，软磁铁氧体，电感，抑制元件四川理工学院毕业设计（论文）ABSTRACTPowerFilterBasedontheanalysisofnetworkstructureandthenatureofsoftferriteonthebasisoftheproposedpowerfilterinsertionlossiscalculated.ThearticleanalyzestheapplicationofnetworktheorypowerEMIfilterinsertionlossandrelatednetworkparametersoftherelationshipbetweenthepowersupplyEMIfilterdiscussedthebasicnetworkarchitectureanditsinsertionlossiscalculated,theestablishmentofasingle-phasepowerfiltercommonmodeanddifferentialmodeequivalentcircuitmodelandfilterpartsofthehigh-frequencydistributedparametermodel,andthenananalysisofferritematerialsinnature,arediscussedinferriteEMIfiltersinpowerapplications,theestablishmentofasoftferritecoreTheequivalentcircuitmodel.AnddescribedinthetextmadeinaccordancewithakindEMIPowerLineFilter.InthispaperalsodiscussedthefinalEMIfilterpowerengineeringapplications.KeyWords:EMIPowerLineFilter，Insertionloss，SoftFerrite，Inductance，Suppressioncomponents四川理工学院毕业设计（论文）目录摘要............................................................IABSTRACT..........................................................I1.1研究背景及其意义.............................................................................................................31.2国内外研究现状................................................................................................................41.2.1国外研究现状..........................................................................................................41.2.2国内研究现状..........................................................................................................51.3本文的主要工作................................................................................................................6第2章EMI电源滤波器的设计原则...................................82.1EMI电源滤波器...............................................................................................................82.2开关电源EMI信号类型及特点....................................................................................102.3开关电源EMI信号类型及特点....................................................................................122.4EMI电源滤波器插入损耗的计算方法.......................................................................132.4.1二端口网络.........................................................................................................132.4.2EMI电源滤波器插入损耗................................................................................152.5电感、电容的高频特性...................................................................................................162.6本章小结..........................................................................................................................19第3章EMI电源滤波器设计.........................................203.1规范..................................................................................................................................203.2滤波器网络结构分析......................................................................................................213.2.1选择滤波器电路结构...........................................................................................213.2.2共模差模等效电路...............................................................................................233.3共模电感和差模电感的计算..........................................................................................24第4章滤波器件的设计与选择......................................294.1软磁铁氧体......................................................................................................................294.1.1初始磁导率............................................................................................................294.1.2复数磁导率、损耗、磁谱及截止频率................................................................304.1.3铁氧体磁芯的选择................................................................................................324.1.4软磁铁氧体与超微晶磁芯的配合使用................................................................344.2滤波器分立元件的设计...................................................................................................354.2.1共模扼流圈............................................................................................................354.2.2差摸电感................................................................................................................374.2.3共模电容和差模电容...........................................................................................384.3EMI电源滤波器整体封装技术......................................................................................404.4产品设计制作与测试......................................................................................................424.4.1产品的设计与制作.............................................................................................434.4.2产品性能的测试...............