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href="/info/industry/special/eda">EDA/PCB</a> > <a href="/info/articlelist/special/eda/type/13">學(xué)習(xí)方法與實(shí)踐</a> > 二極管基礎(chǔ)知識(shí)之三--二極管的正向和反向?qū)щ娞匦?/p> </div> </div> </div>   <script src="https://forum.eepw.com.cn/jscontent/wenzilian" type="text/javascript"></script>  <div class="abjycol" id="container"> <section> <article> <h1>二極管基礎(chǔ)知識(shí)之三--二極管的正向和反向?qū)щ娞匦?/h1> <div id="tckslbr" class="subhead" style="padding-bottom:15px;padding-right:50px;font-size:16px;color:#252525;font-style:normal;text-align:center;">—— </div> <div id="jzhlamr" class="authorTimeSource"> <span>作者：</span> <span>時(shí)間：2007-10-26</span> <span>來(lái)源：二極管導(dǎo)電特性</span> <link rel="stylesheet" type="text/css"/> <span style="float:right; width:130px;margin-right:0px; text-align:right;"> <div id="usltxyw" class="nav0"> <ul> <li><a href="javascript:void(0);"><img src="http://www.ex-cimer.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 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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>　　<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/二極管"><em>二極管</em></a>最重要的特性就是單方向?qū)щ娦?。在電路中，電流只能?a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/二極管"><em>二極管</em></a>的正極流入，負(fù)極流出。下面通過(guò)簡(jiǎn)單的實(shí)驗(yàn)說(shuō)明<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/二極管"><em>二極管</em></a>的正向特性和反向特性。</P> <P>1、正向特性　</P> <P>　　在電子電路中，將二極管的正極接在高電位端，負(fù)極接在低電位端，二極管就會(huì)導(dǎo)通，這種連接方式，稱為正向偏置。必須說(shuō)明，當(dāng)加在二極管兩端的正向電壓很小時(shí)，二極管仍然不能導(dǎo)通，流過(guò)二極管的正向電流十分微弱。只有當(dāng)正向電壓達(dá)到某一數(shù)值（這一數(shù)值稱為“門(mén)檻電壓”，鍺管約為0.2V，硅管約為0.6V）以后，二極管才能直正導(dǎo)通。導(dǎo)通后二極管兩端的電壓基本上保持不變（鍺管約為0.3V，硅管約為0.7V），稱為二極管的“正向壓降”。</P> <P>2、反向特性</P> <P>　　在電子電路中，二極管的正極接在低電位端，負(fù)極接在高電位端，此時(shí)二極管中幾乎沒(méi)有電流流過(guò)，此時(shí)二極管處于截止?fàn)顟B(tài)，這種連接方式，稱為反向偏置。二極管處于反向偏置時(shí)，仍然會(huì)有微弱的反向電流流過(guò)二極管，稱為漏電流。當(dāng)二極管兩端的反向電壓增大到某一數(shù)值，反向電流會(huì)急劇增大，二極管將失去單方向<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/導(dǎo)電特性"><em>導(dǎo)電特性</em></a>，這種狀態(tài)稱為二極管的擊穿。</P></span>  <div class="kpibuke" 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="axfnrlb" class="hAd8"> <p><strong><span style="font-family:宋體;font-size:14px;"><strong><strong><span style="color:#ff0000;font-size:18px;">模擬電路相關(guān)文章:</span><a href="http://www.ex-cimer.com/article/268568.htm" 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