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padding:4px;"> <div style="color:#003f94; font-weight:bold;">上?；閾拍茉純萍加邢薰?/div> 電話：<span style="font-family: 宋體">021- 61992237</span><br /> 傳真：<span style="font-family: 宋體">021- 60853212</span><br /> 手機：<span style="font-family: 宋體">13761108098</span><br /> 信箱：<a href="mailto:shwinener@163.com"><span style="font-family: 宋體">shwinener@163.com</span><a><br /> 聯系人：聶先生<br /> <A target=blank><IMG src="uploadfile/Fckeditor/20100620012243.gif" border=0 ></A> <span style="font-family: 宋體"> 1447631580</span><br /> 地址：上海浦東楊高南路6168號<br/> 興維商務樓205<br /> 郵編：<span style="font-family: 宋體">201318</span> </td> </tr> </table> </div> </td> <td width="20"> </td> <td valign="top">  <table width="760" border="0" cellspacing="0" cellpadding="0"> <tr> <td valign="top"> <div class="index_a1">新聞中心</div><div class="index_a3">您的位置：首頁 >> 新聞中心 >> 技術文檔</div> </td> </tr> </table>   <table width="750" border="0" cellspacing="0" cellpadding="0" align="center"> <tr> <td class="ctitle">IGBT的檢測方法</td> </tr> <tr> <td align="right" height="30"> 來源：上?；閾?nbsp; 發布日期：2014-02-05 點擊次數：<span class="bred">2284</span> </td> </tr> <tr> <td class="ccontent"><p><strong class="pbrdf">IGBT的定義：<br /> </strong> IGBT是絕緣門極雙極型晶體管（Isolated Gate Bipolar Transistor）的代號。也稱為絕緣門極晶體管。由于IGBT內具有寄生晶閘管，所以也稱作絕緣門極晶閘管。由于它將功率場效應管（MOSFET）和功率晶體管（GTR）的優點集于一身，既具有輸入阻抗高、速度快、熱穩定性好和驅動電路簡單的優點，又有通態電壓低、耐壓高的優點。因此，很適合作焊接電源的逆變開關用。給逆變焊接電源的發展帶來更廣闊前景。<br /> 絕緣門極雙極型晶體管本質上是一個場效應晶體管。只是在漏極和漏區之間多了一個P型層。因此，國際電工委員會IEC規定：源極引出的電極端子（含電極端）稱為發射極E，漏極引出的電極端稱為集電極C。 <br /> N溝道IGBT的圖形符號如下： <br /> <img width="180" height="160" alt="" src="/uploadfile/Fckeditor/20140205200847.gif" /><br /> <br /> <br /> IGBT的開關作用是通過施加正向柵極電壓形成溝道，給PNP晶體管提供基極電流，使其開通。反之，施加反向柵極電壓消除溝道，流過反向基極電流，使其關斷。<br /> IGBT的檢測方法：<br /> 移去IGBT的連線，觀察IGBT的外觀是否有損壞。<br /> 檢查IGBT的G1-E1和G2-E2之間是否導通，如果導通，則IGBT損壞。</p> <p><img width="442" height="280" alt="" src="/uploadfile/Fckeditor/20140205200930.png" /></p> <p>用9V電池給門極G（＋）和發射極E（－）施加正電壓，測量集電極C和發射極E的導通情況。<br /> 用9V電池給門極G（＋）和發射極E（－）施加反向電壓，以使IGBT關斷。<br /> 用指針式萬用表測量E1~C1、E2~C2間的導通情況，應為E1→C1、E2→C2方向單向導通。 <br /> <img width="461" height="291" alt="" src="/uploadfile/Fckeditor/20140205201013.png" /></p> <p> </p> <p> </p> <div style="text-indent: 21.1pt"> <div class="pbrdf"> </div> <div class="pbrdf"> </div> <div class="pbrdf"><b> </b></div> <div class="pbrdf"><b> </b></div> <div class="pbrdf"><b> </b></div> <div class="pbrdf"><b> </b></div> <div class="pbrdf"> </div> </div> <p> </p> <p> </p></td> </tr> </table>  </td> </tr> </table> <DIV id=divStay ></DIV> <DIV id=divStayTopleft style="POSITION: absolute"> <TABLE cellSpacing=0 cellPadding=0 width=109 border=0> <TBODY> <TR> <TD colSpan=3><a href="//www.bgpzi.com/" title="快乐10分钟看图写话">快乐10分钟看图写话</a></TD></TR> <TR> <TD width=6 background="./templates/onstage/hui/images/qq_life.gif"></TD> <TD vAlign=top width=96 background="" bgcolor="#FFFFFF"> <TABLE cellSpacing=0 cellPadding=0 width=90 align=center border=0> <TBODY> <TR> <TD height=30> <TABLE cellSpacing=0 cellPadding=0 width=90 border=0> <TBODY> <TR> <TD><IMG height=13 src="./templates/onstage/hui/images/qq_ico1.gif" width=16><SPAN class=font_12> <SPAN style="FONT-SIZE: 9pt">客戶服務</SPAN></SPAN></TD></TR></TBODY></TABLE></TD></TR> <TR> <TD> <TABLE id=table47 cellPadding=2 width="100%" border=0> <TBODY> <TR> <TD vAlign=bottom> </TD></TR></TBODY></TABLE> <TABLE id=table47 cellPadding=2 width="100%" border=0> <TR> <TD vAlign=bottom> <img alt="" style="width: 90px; 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