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<h1>傳導(dǎo)是EMI干擾罪魁禍?zhǔn)?/h1> <div id="wndludq" class="authorTimeSource"> <span>作者：</span> <span>時間：2012-11-07</span> <span>來源：網(wǎng)絡(luò)</span> <link rel="stylesheet" type="text/css"/> <span style="float:right; width:130px;margin-right:0px; text-align:right;"> <div id="rwjckmv" class="nav0"> <ul> <li><a href="javascript:void(0);"><img src="http://cafeforensic.com/event/action/images/icon_add_4.png" width="20" border="0" align="absmiddle" />加入技術(shù)交流群</a> <ul> <li style="text-align:center;"><img src="http://cafeforensic.com/event/company/images/code_1.jpg" width="130"><br />掃碼加入<br />和技術(shù)大咖面對面交流<br />海量資料庫查詢</li> </ul> </li> </ul> </div> </span> <span style="float:right; width:30px;margin-right:0px; text-align:right;"><a rel="nofollow">收藏</a></span> </div> <div id="qllugiv" class="hAd4_Afinal20a_back">  <iframe id='a890e388' name='a890e388' src='https://ad.eepw.com.cn/www/delivery/afr.php?zoneid=88&cb=INSERT_RANDOM_NUMBER_HERE' frameborder='0' scrolling='no' width='660' height='60'><a target='_blank'><img src='https://ad.eepw.com.cn/www/delivery/avw.php?zoneid=88&cb=INSERT_RANDOM_NUMBER_HERE&n=a635e61e' border='0' alt='' /></a></iframe> </div> <div style="margin-top:28px;"></div> <div id="tovdauy" class="content" id="contentDiv" style="position:relative;"> <div id="omunrwd" class="ad_300x180_Afinal13_back">  <iframe id='a225770a' name='a225770a' src='https://ad.eepw.com.cn/www/delivery/afr.php?zoneid=87&cb=INSERT_RANDOM_NUMBER_HERE' frameborder='0' scrolling='no' width='300' height='200'><a target='_blank'><img src='https://ad.eepw.com.cn/www/delivery/avw.php?zoneid=87&cb=INSERT_RANDOM_NUMBER_HERE&n=a576c0a2' border='0' alt='' /></a></iframe> </div> <span id="contentlabels" style="font-size:14px;"><p> 輻射 EMI 干擾可以來自某個不定向發(fā)射源以及某個無意形成的天線。<a class="contentlabel" href="http://cafeforensic.com/news/listbylabel/label/傳導(dǎo)"><em>傳導(dǎo)</em></a>性 EMI 干擾也可以來自某個輻射 EMI 干擾源，或者由一些電路板組件引起。一旦您的電路板接收到<a class="contentlabel" href="http://cafeforensic.com/news/listbylabel/label/傳導(dǎo)"><em>傳導(dǎo)</em></a>性干擾，它便駐入應(yīng)用電路的 PCB 線跡。常見的一些輻射 EMI 干擾源包括以前文章中談及的組件，以及板上開關(guān)式電源、連接線和開關(guān)或者時鐘網(wǎng)絡(luò)。<br /><img onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" border="0" src="http://editerupload.eepw.com.cn/fetch/20140811/259953_1_0.jpg" id="imgddiv273010" /><br /><br />圖 1 <a class="contentlabel" href="http://cafeforensic.com/news/listbylabel/label/傳導(dǎo)"><em>傳導(dǎo)</em></a>性 EMI 信號的<a class="contentlabel" href="http://cafeforensic.com/news/listbylabel/label/耦合"><em>耦合</em></a>介質(zhì)<br /><br />傳導(dǎo)性 EMI 干擾是開關(guān)電路正常工作與寄生電容和電感共同作用產(chǎn)生的結(jié)果。圖 1 顯示了一些會進(jìn)入到您的 PCB 線跡中的 EMI 干擾源情況。Vemi1 源自開關(guān)網(wǎng)絡(luò)，例如：時鐘信號或者數(shù)字信號線跡等。這些干擾源的<a class="contentlabel" href="http://cafeforensic.com/news/listbylabel/label/耦合"><em>耦合</em></a>方式均為通過線跡之間的寄生電容。這些信號將電流尖脈沖帶入鄰近 PCB 線跡。同樣，Vemi2 源自開關(guān)網(wǎng)絡(luò)，或者來自 PCB 上的某個天線。這些干擾源的<a class="contentlabel" href="http://cafeforensic.com/news/listbylabel/label/耦合"><em>耦合</em></a>方式均為通過線跡之間的寄生電感。該信號將電壓擾動帶入鄰近 PCB 線跡。每三個 EMI 源來自于線纜內(nèi)相鄰的導(dǎo)線。沿這些導(dǎo)線傳播的信號可產(chǎn)生串?dāng)_效應(yīng)。<br /><br />開關(guān)式電源產(chǎn)生 Vemi4。開關(guān)式電源產(chǎn)生的干擾駐存在電源線跡上，并以 Vemi4 信號的形式出現(xiàn)。<br /><br />在正常運行期間，開關(guān)式電源 (SMPS) 電路為傳導(dǎo)性 EMI 的形成帶來機會。這些電源內(nèi)的“開”和“關(guān)”切換操作，會產(chǎn)生較強的非連續(xù)性電流。這些非連續(xù)性電流存在于降壓轉(zhuǎn)換器的輸入端、升壓轉(zhuǎn)換器的輸出端，以及反激和降升壓拓?fù)浣Y(jié)構(gòu)的輸入和輸出端。開關(guān)動作引起的非連續(xù)性電流會產(chǎn)生電壓紋波，其通過 PCB 線跡傳播至系統(tǒng)的其它部分。SMPS 引起的輸入和/或輸出電壓紋波，會危害負(fù)載電路的運行。圖 2 顯示了工作在 2 MHz 下的一個 DC/DC 降壓 SMPS 輸入的頻率組成例子。SMPS 傳導(dǎo)干擾的基本頻率組成范圍為 90 – 100 MHz。<br /><br /><img onload="if(this.width>620)this.width=620;" onclick="window.open(this.src)" style="cursor:pointer" border="0" src="http://editerupload.eepw.com.cn/fetch/20140811/259953_1_1.jpg" id="imgddiv273011" /><br />圖 2 DC/DC 降壓轉(zhuǎn)換器：開關(guān)頻率=2MHz<br />輸入和輸出針腳使用10 ?F濾波器時的傳導(dǎo)性EMI測量。<br /><br />共有兩類傳導(dǎo)性干擾：差模干擾和共模干擾。差模干擾信號出現(xiàn)在電路輸入端之間，例如：信號和接地等。電流流經(jīng)同相的兩個輸入端。但是，1號電流輸入大小與2號相等，但方向相反（差動參考）。這兩個輸入端的負(fù)載，形成一個隨電流強弱變化的電壓。線跡1和差分基準(zhǔn)之間的這種電壓變化，在系統(tǒng)中形成干擾或者通信誤差。<br /><br />在您向電路添加一個接地環(huán)路或者不良電流通路時，便出現(xiàn)共模干擾。如果存在某個干擾源，則線跡 1 和線跡 2 上形成共模電流和共模電壓，而接地環(huán)路充當(dāng)一個共模干擾源。差模干擾和共模干擾都要求使用特殊的濾波器，來應(yīng)對 EMI 干擾的不利影響。</p>本文引用地址：<a href="http://cafeforensic.com/article/259953.htm">http://cafeforensic.com/article/259953.htm</a> </span>  <div class="mimkvts" id="coverDiv" class="article_reg" style="width:100%;overflow:hidden;display:none;z-index:10;position:absolute;left:0;background:#fff;"> <center> <img src="https://webstorage.eepw.com.cn/images/display/reg.jpg" border="0" usemap="#Map" /> <map name="Map" id="Map"> <area shape="rect" coords="133,235,319,253" target="_blank" /> <area shape="rect" coords="132,315,319,335" /> </map> </center> </div>  <span id="jvdbiss" class="hAd8"> <br></span>   </div> </article> <div id="uzopmhv" class="clear"></div> <br/> <div 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