本文關鍵詞：強流脈沖環(huán)境下的輻射干擾及抑制措施研究　出處：《華中科技大學》2014年碩士論文　論文類型：學位論文

  更多相關文章： 脈沖功率源 電磁兼容 近場輻射干擾 電磁屏蔽效能

【摘要】：電磁發(fā)射技術的發(fā)展日新月異，其機動性、靈敏性的提高等需要迫切要求其重要組成部分脈沖功率源向小型化、模塊化的方向發(fā)展。而縮小脈沖功率源的體積大小雖然能提高模塊的功率密度，卻使模塊在產(chǎn)生脈沖電流的過程中形成的強磁場對其自身影響更大。高頻高壓充電電源是電容式脈沖功率源的重要組成部分，它為初級能源提供充足的儲能，其主要構(gòu)成為串聯(lián)諧振主電路、控制電路以及檢測電路。其中，主電路由開關器件和磁性元件組成，實現(xiàn)電能的處理和變換；控制電路用來控制開關管、繼電器的動作，以及給晶閘管觸發(fā)信號；檢測電路在充電過程中檢測充電電壓，電流，母線電壓，電流瞬時值，在放電時記錄電感電流波形。與脈沖功率源中的其它部分相比，這些電路均為弱電回路，易受干擾。本文主要研究脈沖電抗器產(chǎn)生的強脈沖磁場對弱電部分的干擾，具體研究內(nèi)容如下: 首先,本文介紹了脈沖功率源的系統(tǒng)組成與工作流程，，簡要分析了整個系統(tǒng)中可能存在的傳導與輻射干擾源。并主要分析了作為系統(tǒng)自身輻射干擾源的脈沖形成網(wǎng)絡（PFN）的工作原理，仿真得到PFN電路中晶閘管與電抗器上的電流波形，對晶閘管與電抗器上的電流波形作傅立葉變換，分析其頻譜特性。 其次，本文使用有限元數(shù)值分析軟件Ansoft Maxwell對PFN回路中的電抗器進行了三維實體建模與電磁場仿真。為模擬正常工作時脈沖電流對脈沖功率源弱電部分的干擾，在簡化的脈沖形成網(wǎng)絡電路模型上加載脈沖電流來作為輻射干擾源。并利用該輻射干擾源模型研究了機殼內(nèi)磁場強度在脈沖磁場下隨空間、時間變化的趨勢，為內(nèi)部電路結(jié)構(gòu)設計提供依據(jù)。 然后，本文從切斷電磁干擾路徑的角度，探討如何提高機殼保護敏感器件不受脈沖干擾源影響的能力。選擇機殼內(nèi)較靠近干擾源的一點的屏蔽效能SE為衡量指標，研究不同材質(zhì)，厚度，開孔形狀對矩形機箱屏蔽效能的影響。 最后，利用有限元仿真的方法，計算得到機殼內(nèi)位于不同平面的同一閉合回路上耦合到的感應電壓。通過比較感應電壓波形,得到了受干擾源影響最小的電路擺位方向。
[Abstract]:With the rapid development of electromagnetic emission technology, its mobility and sensitivity need to be miniaturized. The development of modularization. But reducing the volume of pulse power source can improve the power density of the module. The high frequency and high voltage charging power supply is an important part of capacitive pulse power source, which provides sufficient energy storage for primary energy. The main circuit consists of series resonance main circuit, control circuit and detection circuit. The control circuit is used to control the operation of the switch, the relay, and the trigger signal to the thyristor; The detection circuit detects the instantaneous values of charging voltage, current, bus voltage and current during charging. The inductance current waveform is recorded during discharge. Compared with other parts of the pulse power source, these circuits are all weak current circuits. The main contents of this paper are as follows: (1) the interference of the strong pulsed magnetic field produced by the pulse reactor to the weak part is studied in this paper. First of all, this paper introduces the system composition and work flow of the pulse power source. The possible conduction and radiation interference sources in the whole system are briefly analyzed, and the working principle of the pulse forming network (PFN), which is the system's own radiation interference source, is mainly analyzed. The current waveform of thyristor and reactor in PFN circuit is simulated. The current waveform on thyristor and reactor is analyzed by Fourier transform. Second. The finite element numerical analysis software Ansoft is used in this paper. In order to simulate the interference of pulse current to the weak part of the pulse power source, Maxwell has carried out the three-dimensional solid modeling and electromagnetic field simulation of the reactor in the PFN circuit in order to simulate the interference of the pulse current to the weak current part of the pulse power source during normal operation. The pulse current is loaded on the simplified pulse forming network circuit model to be used as the source of radiation interference. Using the model, the variation trend of magnetic field intensity in the shell with space and time under the pulse magnetic field is studied. Provides the basis for the internal circuit structure design. Then, from the point of view of cutting off the electromagnetic interference path. This paper discusses how to improve the ability of shell to protect sensitive devices from the influence of pulse interference source. The shielding efficiency SE of the point near the interference source in the shell is selected as the measurement index to study the different materials and thickness. The effect of opening shape on shielding efficiency of rectangular chassis. Finally, using finite element simulation method, the inductive voltage coupled to the same closed loop located in different plane in the shell is calculated, and the inductive voltage waveform is compared. The circuit pendulum direction which is least affected by the interference source is obtained.
【學位授予單位】：華中科技大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TN03;TN972

【相似文獻】

相關期刊論文 前10條

1 張適昌;嚴萍;王玨;袁偉群;任成燕;邵濤;張東東;;民用脈沖功率源的進展與展望[J];高電壓技術;2009年03期

2 賀思敏;趙世明;蔣小華;王麗玲;;應用于沖擊片雷管的小型脈沖功率源研究[J];火工品;2011年04期

3 浩慶松;丁臻捷;范菊平;俞建國;袁雪林;潘亞峰;胡龍;方旭;王剛;蘇建倉;;高頻脈沖功率源初級單元的設計[J];強激光與粒子束;2012年10期

4 孫連華;孫鷂鴻;嚴萍;劉傳譜;李敏堂;孫財新;;重復推進系統(tǒng)中脈沖功率源研制及應用[J];電工電能新技術;2010年04期

5 董健年,寧廣炯,黃新華;提高脈沖功率源控制系統(tǒng)抗干擾能力的技術措施[J];彈道學報;1998年03期

6 韓克華;任西;秦國圣;褚恩義;;高壓脈沖功率源輸出特性[J];探測與控制學報;2012年04期

7 徐善綱,張適昌,史黎明;補償脈沖發(fā)電機[J];電工電能新技術;1990年01期

8 董健年,桂應春,李軍;電熱化學炮移動式脈沖功率源(英文)[J];彈道學報;2005年02期

9 袁建強,鄒曉兵,曾乃工,劉銳,李鵬,王新新,韓e

本文編號：1389791