本文關鍵詞： 導電橡膠 電磁兼容 屏蔽機箱 屏蔽效能　出處：《西安電子科技大學》2015年碩士論文　論文類型：學位論文

【摘要】：近年來,隨著電力電子技術與電氣自動化技術的迅速發(fā)展,電磁環(huán)境日漸復雜,電子設備間的相互干擾日益嚴重,電磁兼容問題成為不容忽視的重要課題。為保證設備不受外界的電磁干擾,通常對設備外部加上金屬屏蔽機箱,而由于需要散熱、通風、裝配等因素的存在,不可避免地需要在機箱上開孔開縫。外部的電磁干擾信號通過這些孔縫進入機箱內(nèi)部,影響電子設備的正常工作。用導電橡膠制成的導電襯墊可以較大地減小屏蔽機箱上孔縫所帶來的電磁泄漏。因此,對導電橡膠自身以及導電橡膠對屏蔽機箱的影響進行研究是十分必要的。本文首先結(jié)合電磁屏蔽的原理與電子設備屏蔽機箱的典型結(jié)構(gòu),比較了屏蔽機箱的幾個泄漏特點,確定了縫隙為屏蔽機箱最重要的泄漏源。針對機箱上的縫隙,引入了導電橡膠來對其進行電磁泄漏抑制。導電橡膠對屏蔽機箱屏蔽效能影響最大的即是其導電性能。因此針對影響導電橡膠導電性能的兩大因素:壓縮、電化學腐蝕進行研究。先確定了導電橡膠的壓縮與其導電性能之間的關系,后又確定了導電橡膠的電化學腐蝕對導電橡膠導電性能的影響。針對導電橡膠在電子設備屏蔽機箱上的應用,分兩方面對其進行研究。一方面得到了由導電橡膠的壓縮而引發(fā)的屏蔽機箱形變對屏蔽機箱整體屏蔽效能的影響,在屏蔽效能的計算中將導電橡膠的壓縮量與其導電性能聯(lián)系起來,對屏蔽效能的仿真計算模型進行了優(yōu)化;另一方面得到了屏蔽機箱應用之中出現(xiàn)的導電橡膠電化學腐蝕現(xiàn)象對屏蔽機箱整體的屏蔽效能的影響。
[Abstract]:In recent years, with the rapid development of power electronic technology and electrical automation technology, the electromagnetic environment is becoming more and more complex, and the mutual interference between electronic equipment is becoming more and more serious. The problem of electromagnetic compatibility has become an important issue that can not be ignored. In order to ensure that the equipment is free from external electromagnetic interference, metal shielding case is usually added to the outside of the equipment. However, due to the existence of heat dissipation, ventilation, assembly and other factors, Inevitably, opening holes in the chassis are required. External electromagnetic interference signals enter the inside of the chassis through these seams, The conductive gasket made of conductive rubber can greatly reduce the electromagnetic leakage caused by the holes in the shield case. It is necessary to study the effect of conductive rubber itself and conductive rubber on shielding chassis. Firstly, combining the principle of electromagnetic shielding with the typical structure of shielding chassis of electronic equipment, several leakage characteristics of shielding chassis are compared. The cracks are identified as the most important source of leakage in the shielded chassis. Conductive rubber is introduced to suppress electromagnetic leakage. Conductive rubber has the greatest influence on shielding efficiency of shielding chassis. The relationship between the compression of conductive rubber and its electrical conductivity was determined. The effect of electrochemical corrosion of conductive rubber on conductive properties of conductive rubber was determined. On the one hand, the effect of shielding box deformation caused by the compression of conductive rubber on the shielding effectiveness of shielding chassis is obtained. In the calculation of shielding efficiency, the compression of conductive rubber is connected with its conductive property, and the simulation model of shielding efficiency is optimized. On the other hand, the effect of electrochemistry corrosion of conductive rubber on shielding efficiency of shielding chassis is obtained.
【學位授予單位】：西安電子科技大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TN03

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