【摘要】：現(xiàn)代電子設(shè)備對(duì)可靠性要求越來(lái)越高，尤其是對(duì)電磁兼容性提出了很高的要求。如何設(shè)計(jì)處結(jié)構(gòu)合理，屏蔽效能良好的機(jī)箱是本課題追求的目標(biāo)。針對(duì)機(jī)箱的工作環(huán)境以及有關(guān)機(jī)箱的設(shè)計(jì)要求，對(duì)此機(jī)箱進(jìn)行了電磁兼容設(shè)計(jì)。 本論文采取理論和試驗(yàn)相結(jié)合的方式，從機(jī)箱的屏蔽效能出發(fā)，分析箱體材料、箱體縫隙對(duì)屏蔽效能的影響，以及電源線上濾波器的使用，，對(duì)整個(gè)箱體電磁兼容兼容性的影響，提出了一系列預(yù)防措施，具體包括以下幾點(diǎn)：（1）屏蔽材料的選擇：材料選擇的合適與否直接影響屏蔽體的屏蔽效果的好壞。通過(guò)對(duì)金屬材料的屏蔽原理進(jìn)行分析，了解了材料的屏蔽效能的組成，根據(jù)機(jī)箱的結(jié)構(gòu)和成本要求，選擇合適的材料作為屏蔽體，并計(jì)算其屏蔽效能是否符合要求。（2）箱體縫隙的屏蔽：實(shí)際工程中的屏蔽體都帶有孔縫，直接影響屏蔽性能的完整性，本文結(jié)合導(dǎo)電襯墊的屏蔽效能的分析，了解到在箱體縫隙處使用導(dǎo)電襯墊可以提高整個(gè)箱體的屏蔽性能。（3）電源干擾：對(duì)機(jī)箱來(lái)說(shuō)，穿入箱體內(nèi)部的電源線是一個(gè)很大的干擾源，可以采用對(duì)箱內(nèi)的電源引線的穿入處使用電源濾波器并進(jìn)行單獨(dú)屏蔽。（4）為了能直觀的了解對(duì)機(jī)箱的電磁兼容性設(shè)計(jì)，對(duì)箱體進(jìn)行了UG實(shí)體建模，從模型圖中可以了解到電磁泄漏位置以及在生產(chǎn)中應(yīng)采取何種措施解決問(wèn)題。（5）參照電子設(shè)備的相關(guān)屏蔽效能的要求和測(cè)試方法對(duì)箱體進(jìn)行相關(guān)電磁兼容性的測(cè)試分析，用以驗(yàn)證本論文的對(duì)機(jī)箱進(jìn)行電磁兼容性結(jié)構(gòu)設(shè)計(jì)是否合理。
[Abstract]:Modern electronic equipments require more and more high reliability, especially electromagnetic compatibility (EMC). How to design a reasonable structure, shielding efficiency of the chassis is the goal pursued by this subject. According to the working environment of the chassis and the design requirements of the chassis, the electromagnetic compatibility design of the chassis is carried out. In this paper, by combining theory and experiment, we analyze the influence of box material, box gap on shielding efficiency, and the use of filter on power line, and the influence of the whole box body electromagnetic compatibility. A series of preventive measures are put forward, including the following: (1) the selection of shielding material: whether the material is suitable or not directly affects the shielding effect of the shield. Through the analysis of the shielding principle of metal materials, the composition of shielding effectiveness of materials is understood. According to the structure and cost requirements of the chassis, the appropriate materials are selected as the shielding body. And calculate whether the shielding effectiveness meets the requirements. (2) the shielding of the slot in the box: in the actual engineering, the shield has holes, which directly affects the integrity of the shielding performance, this paper combined with the analysis of the shielding effectiveness of the conductive gasket, It has been learned that the use of conductive gaskets in the slot of the box can improve the shielding performance of the whole box. (3) Power interference: for the chassis, the power cord penetrating the inside of the box is a great source of interference. The power filter can be used to penetrate the power lead in the box and be shielded separately. (4) in order to understand the electromagnetic compatibility design of the chassis directly, the UG solid model of the box is built. From the model diagram, the location of electromagnetic leakage and what measures should be taken to solve the problem can be found. (5) according to the requirements and test methods of shielding effectiveness of electronic equipment, the relevant electromagnetic compatibility of the box is tested and analyzed. It is used to verify whether the EMC structure design of this paper is reasonable.
【學(xué)位授予單位】：西安工程大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2012
【分類號(hào)】：TH122

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