1、 毕业设计（论文）中期报告 题目： 通用型蓄电池充电电源硬件设计 外 文 翻 译 原文： Modeling, Simulation, and Reduction of Conducted Electromagnetic Interference Due to a PWM Buck Type Switching Power Supply 译文： 基于压降型 PWM 开关电源的建模、仿真和减少传导性电磁干扰 院（系） 电子信息工程学院 专 业 自动化 班 级 080403 姓 名 沈 阳 学 号 080403113 导 师 王青岳 2012 年 5 月 3 日 Modeling, Simulati
2、on, and Reduction of Conducted Electromagnetic Interference Due to a PWM Buck Type Switching Power Supply A. Farhadi http:/10.11.248.20:8000/rewriter/EI Abstract:Undesired generation of radiated or conducted energy in electrical systems is called Electromagnetic Interference (EMI). High speed switch
3、ing frequency in power electronics converters especially in switching power supplies improves efficiency but leads to EMI. Different kind of conducted interference, EMI regulations and conducted EMI measurement are introduced in this paper. Compliancy with national or international regulation is cal
4、led Electromagnetic Compatibility (EMC). Power electronic systems producers must regard EMC. Modeling and simulation is the first step of EMC evaluation. EMI simulation results due to a PWM Buck type switching power supply are presented in this paper. To improve EMC, some techniques are introduced a
5、nd their effectiveness proved by simulation. Index Terms:Conducted, EMC, EMI, LISN, Switching Supply I. INTRODUCTION FAST semiconductors make it possible to have high speed and high frequency switching in power electronics 1 . High speed switching causes weight and volume reduction of equipment, but
6、 some unwanted effects such as radio frequency interference appeared 2 . Compliance with electromagnetic compatibility (EMC) regulations is necessary for producers to present their products to the markets. It is important to take EMC aspects already in design phase 3 . Modeling and simulation is the
7、 most effective tool to analyze EMC consideration before developing the products. A lot of the previous studies concerned the low frequency analysis of power electronics components 4 5 . Different types of power electronics converters are capable to be considered as source of EMI. They could propaga
8、te the EMI in both radiated and conducted forms. Line Impedance Stabilization Network (LISN) is required for measurement and calculation of conducted interference level 6 . Interference spectrum at the output of LISN is introduced as the EMC evaluation criterion 7 8 . National or international regul
9、ations are the references for the evaluation of equipment in point of view of EMC 7 8 . II. SOURCE, PATH AND VICTIM OF EMI Undesired voltage or current is called interference and their cause is called interference source. In this paper a high-speed switching power supply is the source of interferenc
10、e. Interference propagated by radiation in area around of an interference source or by conduction through common cabling or wiring connections. In this study conducted emission is considered only. Equipment such as computers, receivers, amplifiers, industrial controllers, etc that are exposed to int
11、erference corruption are called victims. The common connections of elements, source lines and cabling provide paths for conducted noise or interference. Electromagnetic conducted interference has two components as differential mode and common mode 9 . A. Differential mode conducted interference This
12、 mode is related to the noise that is imposed between different lines of a test circuit by a noise source. Related current path is shown in Fig. 1 9 . The interference source, path impedances, differential mode current and load impedance are also shown in Fig. 1. B. Common mode conducted interferenc
13、e Common mode noise or interference could appear and impose between the lines, cables or connections and common ground. Any leakage current between load and common ground could be modeled by interference voltage source. Fig. 2 demonstrates the common mode interference source, common mode currents Icm1 and
