【正文】 線路阻抗穩(wěn)定網(wǎng)絡(luò)輸出的干擾頻譜被引為電磁兼容性的評估標(biāo)準(zhǔn)。電磁干擾源可以通過輻射和傳導(dǎo)兩種方式來傳播。許多以前的研究都有涉及到電力電子元件的低頻分析 [4~5]。在設(shè)計階段考慮電磁兼容性問題是非常重要的 [3]。高速的開關(guān)造成設(shè)備的重量和體積的減少，但與此同時這也造成了一些不利的影響，比如無線頻率的干擾 [2]。為了提高 電子設(shè)備的 電磁兼容性 ,在論文中 介紹了一些技術(shù)， 并且 通過仿真提高了 電子設(shè)備的工作 效率。電磁兼容性評估的第一步就是建模和仿真。 如果電子設(shè)備的電磁干擾符合 國家或 者國際 規(guī) 章稱 為電磁兼容性（ EMC）。 尤其是 在開關(guān)電源中 的 電力電子轉(zhuǎn)換器經(jīng)常高速切換 時 ，雖然提高了 工作 效率，卻導(dǎo)致 轉(zhuǎn)換器 產(chǎn)生了電磁干擾。 在論文即將完成之際，我的心情無法平靜，從開始進入課題到論文的順利完成，有多少可敬的師長、同學(xué)、朋友給我無言的幫助，在這里請接收我誠摯的謝意 ! 23 附錄 A 整機原理圖 24 25 附錄 B 元件參數(shù)表 裝配位號 裝配參數(shù) 裝配位號 裝配參數(shù) C1 22μ F/16V C2 47μ F /16V C3 47μ F/16V C4 4700pF C5 2200μ F/16V C6 47μ F/16V C7 47μ F/16V C8 F C9 F C10 F C11 F C12 10μ F/400V C14 F/1000V C13 10μ F/50V VD1~VD4 1N4148 C15 10μ F/50V VD9~VD11 1N4148 VD5~D8 HER306 VD13 1N4148 VD12 FR107 DZ1 15V/ VD14 FR107 IC IC2 TL494CN DZ2 30V/ VT VT3 8550 LED 綠色 Ф3 VT VT8 KSP44 VT VT4 IRF3205 VT VT10 IRF740 VT VT7 IRF740 R2 39K R1 36K R4 270 R3 100K R6 R5 100K R8~R11 R7 R13 10K R12 470K R15 10K R14 220K R1 R18 1K R16 R20 R19 R22 10K R21 1K R25 1K R2 R24 R27 R26 16K 26 附錄 C 元件參數(shù)表 裝配位號 裝配參數(shù) 裝配位號 裝配參數(shù) DCIN 12V/DC X AC 彈片插孔 Rt 150 T1 EI33 R2 R29 100K 27 附錄 D 整機 PCB 板 (兩面 ) 28 29 參考文獻 [1] 周志敏 , 周紀(jì)海，紀(jì)愛華．現(xiàn)代開關(guān)電源控制電路設(shè)計及應(yīng)用[M]．北京：人民郵電出版社， 2021： 124147． [2] 康華光，陳大欽．電子技術(shù)基礎(chǔ)（模擬部分）（第四版） [M]．北京：高等教育出版社， 1999： 37， 51， 5355， 57， 6870， 168170， 444470． [3] 康華光，鄒壽彬．電子技術(shù)基礎(chǔ)（數(shù)字部分）（第四版） [M]．北京：高等教育出版社， 2021： 3233， 197198． [4] 曾興雯，劉乃安，陳?。哳l電子線路［Ｍ］．北京：高等教育出版社， 2021： 9597． [5] 何希才．新型電子電路應(yīng) 用實例 [M]．北京：科學(xué)出版社， 2021：2226， 241245． [6] 都永超，朱漢林．無線電（期刊） [J]．北京：人民郵電出版社． 2021年 11 月總第 518 期． 4850． [7] 黃燕．常用電子設(shè)備開關(guān)電源檢修方法 [M]．北京：科學(xué)出版社，2021： 3038， 84， 94， 154． [8] 李瀚蓀．電路分析基礎(chǔ)（第 3 版） [M]．北京：高等教育出版社，1993： 5155． [9] 《日英漢無線電技術(shù)詞典》編輯組．日英漢無線電技術(shù)詞典 [Z]．北京：國防工業(yè)出版社， 1971： 258， 496， 761， 901． [10] 夏路易，石宗義 ．電路原理圖與電路板設(shè)計教程PROTEL99SE[M]．北京：北京希望電子出版社， 2021： 7279． [11] 王兆安 ， 黃俊 ． 電力電子技術(shù) .機械工業(yè)出版社， 2021:132133. [12] 清華大學(xué)電子學(xué)教研組，華成英，童詩白 .模擬電子技術(shù)基礎(chǔ) .北京：高等教育出版社， 2021:40,116. [13] 黃俊，王兆安 ． 電力電子變流技術(shù)（第 3 版） .北京：機械工業(yè)出版社， 1994:124. [14] 趙良炳 ． 現(xiàn)代電力電子技術(shù)基礎(chǔ) .北京：清華大學(xué)出版社，1995:23,45. [15] 李序葆，趙永健 ． 電力電子器件及其應(yīng)用 .北京：機械工業(yè)出版社， 1996:44,152,156. 30 外文資料翻譯 Modeling, Simulation, and Reduction of Conducted Electromagic Interference Due to a PWM Buck Type Switching Power Supply I 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 conduc ted 31 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 32 This 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 interference Common mode noise or interference could appear and impose between the lines, cables or connections and mon ground. Any leakage current between load and mon