【正文】 畢業(yè)設計（論文）中期報告 題目： 通用型蓄電池充電電源硬件設計 外 文 翻 譯 原 文 ： Modeling, Simulation, and Reduction of Conducted Electromagic Interference Due to a PWM Buck Type Switching Power Supply 譯文： 基于壓降型 PWM 開關電源的建模、仿真和減少傳導性電磁干擾 院（系） 電子信息工程學院 專 業(yè) 自動化 班 級 080403 姓 名 沈 陽 學 號 080403113 導 師 王青岳 2021 年 5 月 3 日 Modeling, Simulation, and Reduction of Conducted Electromagic Interference Due to a PWM Buck Type Switching Power Supply A. Farhadi Abstract:Undesired generation of radiated or conducted energy in electrical systems is called Electromagic Interference (EMI). High speed switching 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 called Electromagic 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 and 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 some unwanted effects such as radio frequency interference appeared ??2 . Compliance with electromagic patibility (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 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 ponents ??4 ??5 . Different types of power electronics converters are capable to be considered as source of EMI. They could propagate 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 regulations 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 highspeed switching power supply is the source of interference. Interference propagated by radiation in area around of an interference source or by conduction through mon cabling or wiring connections. In this study conducted emission is considered only. Equipment such as puters, receivers, amplifiers, industrial controllers, etc that are exposed to interference corruption are called victims. The mon connections of elements, source lines and cabling provide paths for conducted noise or interference. Electromagic conducted interference has two ponents as differential mode and mon mode ??9 . A. Differential mode conducted interference This mode is related to the noise that is imposed between different lines of a test ci