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<article> <h1>萬用表測試MOS管使用及更換總是很難？看看這個吧！（二）</h1> <div id="xhnrltl" class="authorTimeSource"> <span>作者：</span> <span>時間：2019-02-03</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="bb9f9br" 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 style="text-align:center;"><img src="http://www.ex-cimer.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="xzp9t91" 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="hj99dh3" class="content" id="contentDiv" style="position:relative;"> <div id="t9f9b99" 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>　　現(xiàn)在由于生產(chǎn)工藝的進步，出廠的篩選、檢測都很嚴格，我們一般判斷只要判斷<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/MOS管"><em>MOS管</em></a>不漏電、不擊穿短路、內(nèi)部不斷路、能放大就可以了，方法極為簡單：</p>本文引用地址：<a href="http://www.ex-cimer.com/article/201902/397428.htm">http://www.ex-cimer.com/article/201902/397428.htm</a><p>　　采用<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/萬用表"><em>萬用表</em></a>的R×10K擋;R×10K擋內(nèi)部的電池一般是9V加1.5V達到10.5V這個電壓一般判斷PN結(jié)點反相漏電是夠了，<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/萬用表"><em>萬用表</em></a>的紅表筆是負電位(接內(nèi)部電池的負極)，<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/萬用表"><em>萬用表</em></a>的黑表筆是正電位(接內(nèi)部電池的正極)，如上圖所示。</p><p><strong>　　2)測試步驟：</strong></p><p>　　把紅表筆接到<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/MOS管"><em>MOS管</em></a>的源極S;把黑表筆接到<a class="contentlabel" href="http://www.ex-cimer.com/news/listbylabel/label/MOS管"><em>MOS管</em></a>的漏極D，此時表針指示應(yīng)該為無窮大，如下圖所示。如果有歐姆指數(shù)，說明被測管有漏電現(xiàn)象，此管不能用。</p><p>　　</p><center><img alt="萬用表測試MOS管使用及更換總是很難？看看這個吧！" src="http://p1.pstatp.com/large/pgc-image/1538976986330d15b2da026" width="203" height="198"/></center><p><br/></p><p>　　保持上述狀態(tài);此時用一只100K～200K電阻連接于柵極和漏極，如下圖所示;這時表針指示歐姆數(shù)應(yīng)該越小越好，一般能指示到0歐姆，這時是正電荷通過100K電阻對MOS管的柵極充電，產(chǎn)生柵極電場，由于電場產(chǎn)生導(dǎo)致導(dǎo)電溝道致使漏極和源極導(dǎo)通，所以萬用表指針偏轉(zhuǎn)，偏轉(zhuǎn)的角度大(歐姆指數(shù)小)證明放電性能好。</p><p>　　</p><center><img alt="萬用表測試MOS管使用及更換總是很難？看看這個吧！" src="http://p3.pstatp.com/large/pgc-image/15389769881463417483ece" width="202" height="190"/></center><p><br/></p><p>　　此時在上圖的狀態(tài);再把連接的電阻移開，這時萬用表的指針仍然應(yīng)該是MOS管導(dǎo)通的指數(shù)不變，如下圖所示。雖然電阻拿開，但是因為電阻對柵極所充的電荷并沒有消失，柵極電場繼續(xù)維持，內(nèi)部導(dǎo)電溝道仍然保持，這就是絕緣柵型MOS管的特點。</p><p>　　如果電阻拿開表針會慢慢的逐步的退回到高阻甚至退回到無窮大，要考慮該被測管柵極漏電。</p><p>　　</p><center><img alt="萬用表測試MOS管使用及更換總是很難？看看這個吧！" src="http://p1.pstatp.com/large/pgc-image/153897698854653fa440e7b" width="199" height="177"/></center><p><br/></p><p>　　這時用一根導(dǎo)線，連接被測管的柵極和源極，萬用表的指針立即返回到無窮大，如上圖所示。導(dǎo)線的連接使被測MOS管，柵極電荷釋放，內(nèi)部電場消失;導(dǎo)電溝道也消失，所以漏極和源極之間電阻又變成無窮大。</p><p>　　</p><center><img alt="萬用表測試MOS管使用及更換總是很難？看看這個吧！" src="http://p1.pstatp.com/large/pgc-image/1538976988926ab9d48dc20" width="191" height="175"/></center><p><br/></p><p><strong>　　2、MOS管的更換</strong></p><p>　　在修理電視機及各種電器設(shè)備時，遇到元器件損壞應(yīng)該采用相同型號的元件進行更換。但是，有時相同的元件手邊沒有，就要采用其他型號的進行代換，這樣就要考慮到各方面的性能、參數(shù)、外形尺寸等，例如電視的里面的行輸出管，只要考慮耐壓、電流、功率一般是可以進行代換的(行輸出管外觀尺寸幾乎相同)，而且功率往往大一些更好。</p><p>　　對于MOS管代換雖然也是這一原則，最好是原型號的最好，特別是不要追求功率要大一些，因為功率大;輸入電容就大，換了后和激勵電路就不匹配了，激勵灌流電路的充電限流電阻的阻值的大小和MOS管的輸入電容是有關(guān)系的，選用功率大的盡管容量大了，但輸入電容也就大了，激勵電路的配合就不好了，這反而會使MOS管的開、關(guān)性能變壞。所示代換不同型號的MOS管，要考慮到其輸入電容這一參數(shù)。</p><p>　　例如有一款42寸液晶電視的背光高壓板損壞，經(jīng)過檢查是內(nèi)部的大功率MOS管損壞，因為無原型號的代換，就選用了一個，電壓、電流、功率均不小于原來的MOS管替換，結(jié)果是背光管出現(xiàn)連續(xù)的閃爍(啟動困難)，最后還是換上原來一樣型號的才解決問題。</p><p>　　檢測到MOS管損壞后，更換時其周邊的灌流電路的元件也必須全部更換，因為該MOS管的損壞也可能是灌流電路元件的欠佳引起MOS管損壞。即便是MOS管本身原因損壞，在MOS管擊穿的瞬間，灌流電路元件也受到傷害，也應(yīng)該更換。</p><p>　　就像我們有很多高明的維修師傅在修理A3開關(guān)電源時;只要發(fā)現(xiàn)開關(guān)管擊穿，就也把前面的2SC3807激勵管一起更換一樣道理(盡管2SC3807管，用萬用表測量是好的)。</p><p><br/></p></span>  <div class="dxdpb9v" id="coverDiv" class="article_reg" 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