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class="ss2"> 熱門關(guān)鍵詞： </div> </div>  </div> <div id="6aplaizydtj" class="clear"> </div>  <script type="text/javascript"> initCommonHeader(); </script> <script type="text/javascript"> var OBJ_TITLE = "解析開關(guān)電源電磁干擾因??; var OBJ_ID = "493"; var MARK = "news"; var ARR_AD_MARK = ["news_detail_1", "news_detail_2", "news_detail_3"]; var SID = "0001,0002,0006"; //權(quán)限ID var AUTHORITY_ID = ""; </script> <script src="/JS/Cls_jsPage.js"></script>  <div id="6aplaizydtj" class="content"> <div id="6aplaizydtj" class="plc2"> 當(dāng)前位置??a href="/">首頁</a> » <a href="/news/">資訊中心</a> » <a href="/News/News-0001,0002,0006.shtml"> 晨飛資訊</a> » <a href="/Article/jiexikaiguandianyuan_1.html">解析開關(guān)電源電磁干擾因??/a></div> <div id="6aplaizydtj" class="list4nr"> <div id="6aplaizydtj" class="n_info_con" id="printableview"> <h3> 解析開關(guān)電源電磁干擾因??/h3> <div id="6aplaizydtj" class="info_con_tit"> <div id="6aplaizydtj" class="info_con_tit"> <div id="6aplaizydtj" class="n_tit"> <span>文章出處??a href=""><a >深圳市晨飛電子有限公??/a></a></span><span>網(wǎng)責(zé)任編輯：<a >NSW</a></span><span>作者：<a >NSW</a></span><span>人氣??span id="cntrHits">-</span></span><span>發(fā)表時(shí)間??015-08-24 09:06:00</span> <div id="6aplaizydtj" class="newchang">  <div class="6aplaizydtj" id="ckepop"> <a class="jiathis jiathis_txt jtico jtico_jiathis" target="_blank">分享到：</a> <a class="jiathis_button_qzone">QQ空間</a> <a class="jiathis_button_tsina"> 新浪微博</a> <a class="jiathis_button_tqq">騰訊微博</a> <a class="jiathis_button_tsohu">搜狐微博</a> <a class="jiathis_button_t163">網(wǎng)易微博</a> <a class="jiathis_button_tools_1"></a><a class="jiathis_button_tools_2"></a> </div> <script type="text/javascript"> var jiathis_config = { "data_track_clickback": true };</script> <script type="text/javascript" src="http://v2.jiathis.com/code/jia.js?uid=899792" charset="utf-8"></script>  </div> </div> </div> </div> <div class="6aplaizydtj" id="cntrBody"> <p><span style="font-size: 14px">　　開關(guān)電源產(chǎn)??a href="http://m.linhang.com.cn ">電磁干擾</a>最根本的原因，就是其在工作過程中產(chǎn)生的高di/dt和高dv/dt，它們產(chǎn)生的浪涌電流和尖峰電壓形成了干擾源。工頻整流濾波使用的大電容充電放電、開關(guān)管高頻工作時(shí)的電壓切換、輸出整流二極管的反向恢復(fù)電流都是這類干擾源??/span></p> <p style="text-align: center"><span style="font-size: 14px"><img alt="" width="600" height="600" src="/UploadFiles/FCK/高頻變壓??5).jpg" /></span></p> <p><span style="font-size: 14px">　　開關(guān)電源中的電壓電流波形大多為接近矩形的周期波。對(duì)于矩形波，周期的倒數(shù)決定了波形的基波頻率;兩倍脈沖邊緣上升時(shí)間或下降時(shí)間的倒數(shù)決定了這些邊緣引起的頻率分量的頻率值，典型的值在MHz范圍，而它的諧波頻率就更高了。這些高頻信號(hào)都對(duì)開關(guān)電源基本信號(hào)，尤其是控制電路的信號(hào)造成干擾??/span></p> <p> </p> <p><span style="font-size: 14px">　　1、分布及寄生參數(shù)引起的開關(guān)電源噪??/span></p> <p> </p> <p><span style="font-size: 14px">　　開關(guān)電源的分布參數(shù)是多數(shù)干擾的內(nèi)在因素，開關(guān)電源和散熱器之間的分布電容、變壓器初次級(jí)之間的分布電容、原副邊的漏感都是噪聲源。共模干擾就是通過變壓器初、次級(jí)之間的分布電容以及開關(guān)電源與散熱器之間的分布電容傳輸?shù)??/span></p> <p> </p> <p><span style="font-size: 14px">　　其中變壓器繞組的分布電容與高頻變壓器繞組結(jié)構(gòu)、制造工藝有關(guān)?？梢酝ㄟ^改進(jìn)繞制工藝和結(jié)構(gòu)、增加繞組之間的絕緣、采用法拉第屏蔽等方法來減小繞組間的分布電容。而開關(guān)電源與散熱器之間的分布電容與開關(guān)管的結(jié)構(gòu)以及開關(guān)管的安裝方式有關(guān)。采用帶有屏蔽的絕緣襯墊可以減小開關(guān)管與散熱器之間的分布電容??/span></p> <p> </p> <p><span style="font-size: 14px">　　2、輸入電流畸變?cè)斐傻脑??/span></p> <p> </p> <p><span style="font-size: 14px">　　開關(guān)電源的輸入普遍采用橋式整流、電容濾波型整流電源。這種畸變的電流實(shí)質(zhì)上除了包含基波分量以外還含有豐富的高次諧波分量。這些高次諧波分量注入電網(wǎng)，引起嚴(yán)重的諧波污染，對(duì)電網(wǎng)上其他的電器造成干擾??/span></p> <p> </p> <p><span style="font-size: 14px">　　3、電源線引入的電磁噪??/span></p> <p> </p> <p><span style="font-size: 14px">　　電源線噪聲是電網(wǎng)中各種用電設(shè)備產(chǎn)生的電磁騷擾沿著電源線傳播所造成的。電源線噪聲分為兩大類：共模干擾、差模干擾。共模干擾定義為任何載流導(dǎo)體與參考地之間的不希望有的電位??差模干擾定義為任何兩個(gè)載流導(dǎo)體之間的不希望有的電位差??/span></p> <p> </p> <p><span style="font-size: 14px">　　4、輸出整流二極管產(chǎn)生的干??/span></p> <p> </p> <p><span style="font-size: 14px">　　理想的二極管在承受反向電壓時(shí)截止，不會(huì)有反向電流通過。而實(shí)際二極管正向?qū)〞r(shí)，PN結(jié)內(nèi)的電荷被積累，當(dāng)二極管承受反向電壓時(shí)，PN結(jié)內(nèi)積累的電荷將釋放并形成一個(gè)反向恢復(fù)電流，它恢復(fù)到零點(diǎn)的時(shí)間與結(jié)電容等因素有關(guān)??/span></p> <p> </p> <p><span style="font-size: 14px">　　5、開關(guān)管及變壓器產(chǎn)生的干??/span></p> <p> </p> <p><span style="font-size: 14px">　　主開關(guān)管是開關(guān)電源的核心器件，同時(shí)也是干擾源。其工作頻率直接與電磁干擾的強(qiáng)度相關(guān)。隨著開關(guān)管的工作頻率升高，開關(guān)管電壓、電流的切換速度加快，其傳導(dǎo)干擾和輻射干擾也隨之增加。此外，主開關(guān)管上反并聯(lián)的鉗位二極管的反向恢復(fù)特性不好，或者電壓尖峰吸收電路的參數(shù)選擇不當(dāng)也會(huì)造成電磁干擾??/span></p> <p> </p> <p><span style="font-size: 14px">　　開關(guān)回路中開關(guān)管的負(fù)載是高頻變壓器初級(jí)線圈，它是一個(gè)感性的負(fù)載，所以，開關(guān)管通斷時(shí)在高頻變壓器的初級(jí)兩端會(huì)出現(xiàn)尖峰噪聲。輕者造成干擾，重者擊穿開關(guān)管。主變壓器繞組之間的分布電容和漏感也是引起電磁干擾的重要因素??/span></p> <p> </p> </div> <div id="6aplaizydtj" class="apage" id="showfenye">  <script type="text/javascript"> var pagecont=1; if(pagecont > 2) { var ss = new Cls_jsPage(1, 1, 5, "ss"); 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