摘要：本文以开关电源为例,通过应用二端电路理论和滤波器各元件选取分析，对滤波电路进行了分析。并利用matlab编程和proteus软件实现了对高频滤波电路参数的设计，建立了滤波器插入损耗仿真模型，得到各元件对共模、差模高频等效电路影响的仿真曲线。分析了仿真结果，验证了设计方法的正确性。同时，在EMI电源滤波器高频特性分析的基础上，对EMI电源滤波器进行了PCB布板设计，并论述了滤波器工程应用中的问题。91414
毕业论文关键词：网络理论，EMI电源滤波器，插入损耗，开关电源
Abstract ： This paper takes switch power supply for example,through the application of the theory of two-side-circuit and the analysis of filter element selections, the filter circuit is analyzed successfully。 And it uses the matlab programming and proteus softwares to realize the design of high frequency filter circuit parameter, establish the filter insertion loss simulation model and get simulations of curves which have all the components of the influences of common-mode high-frequency equivalent circuits and differential-mode high-frequency equivalent circuits。 And then the paper analyzes the simulation results, verified the correctness of the design method。 At the same time, on the EMI power filter basis of the analysis of the high frequency characteristics。It was designed a PCB layout for the EMI power filter。And it also discusses the problems in the application of filter engineering。
Keywords：network theory,EMI source filter,insertion loss,swltch power
目 录
1 引言 3
1．1 背景及意义 3
1．3 本文设定参数 4
2 开关电源干扰分析及EMI滤波器类型 4
2．1 开关电源的干扰类型 4
2．2 EMI电源滤波器类型 5
2．3 EMI电源滤波器主要特性指标 5
3 EMI电源滤波器的设计原则 6
3．1 满足阻抗最大失配原则 6
3．2 干扰分离原则 7
4 EMI电源滤波器网络结构及其插入损耗计算 7
4．1 滤波器电路结构 7
4．2 EMI电源滤波器插入损耗理论计算 8
4．3 电容、电感器件的高频模型 9
5 EMI电源滤波器的设计 12
5．1 设计规范和设计目标 12
5．2 EMI滤波器电路分析 13
5．3 共模与差模干扰的判别与抑制 EMI电源滤波器的设计和研究matlab程序:http://www.youerw.com/tongxin/lunwen_198898.html