万用表如何测量逆变IGBT模块是否完好
<p class="MsoListParagraph" style="margin-top:5px;margin-right:0;margin-bottom: 5px;margin-left:28px;text-indent:0">A、 <span style=";font-family:'思源黑体 CN Normal',sans-serif">测试逆变</span>IGBT<span style=";font-family:'思源黑体 CN Normal',sans-serif">二极管特性是否完好：</span></p><p class="MsoListParagraph" style="margin-top:5px;margin-right:0;margin-bottom: 5px;margin-left:67px">a) <span style=";font-family:'思源黑体 CN Normal',sans-serif">红表笔接负母排（</span>-<span style=";font-family:'思源黑体 CN Normal',sans-serif">），黑表笔依次接</span>U<span style=";font-family:'思源黑体 CN Normal',sans-serif">、</span>V<span style=";font-family:'思源黑体 CN Normal',sans-serif">、</span>W <span style=";font-family:'思源黑体 CN Normal',sans-serif">端子，测试逆变</span>IGBT<span style=";font-family:'思源黑体 CN Normal',sans-serif">下桥二极管特性。</span></p><p class="MsoListParagraph" style="margin-top:5px;margin-right:0;margin-bottom: 5px;margin-left:67px">b) <span style=";font-family:'思源黑体 CN Normal',sans-serif">黑表笔接正母排（</span>+<span style=";font-family:'思源黑体 CN Normal',sans-serif">），红表笔依次接</span>U<span style=";font-family:'思源黑体 CN Normal',sans-serif">、</span>V<span style=";font-family:'思源黑体 CN Normal',sans-serif">、</span>W <span style=";font-family:'思源黑体 CN Normal',sans-serif">端子。测试逆变</span>IGBT<span style=";font-family:'思源黑体 CN Normal',sans-serif">上桥二极管特性。</span></p><p style="margin-top:5px;margin-right:0;margin-bottom:5px;margin-left:57px"><strong><span style=";font-family:'思源黑体 CN Normal',sans-serif">☞</span></strong><strong><span style=";font-family:'思源黑体 CN Normal',sans-serif">判定标准：</span></strong><span style=";font-family:'思源黑体 CN Normal',sans-serif">逆变桥的正常二极管特性一般在</span>0.35V-0.45V <span style=";font-family:'思源黑体 CN Normal',sans-serif">之间，且整流桥</span>6<span style=";font-family:'思源黑体 CN Normal',sans-serif">个二极管特性压降基本一致，偏差很小，在</span>0.05V<span style=";font-family:'思源黑体 CN Normal',sans-serif">以内；如果某个二极管特性压降接近零或无穷大，则该</span>IGBT<span style=";font-family:'思源黑体 CN Normal',sans-serif">可能损坏。</span></p><p class="MsoListParagraph" style="margin-top:5px;margin-right:0;margin-bottom: 5px;margin-left:28px;text-indent:0">B、 <span style=";font-family:'思源黑体 CN Normal',sans-serif">测试逆变</span>IGBT <span style=";font-family:'思源黑体 CN Normal',sans-serif">的驱动</span>G.E <span style=";font-family:'思源黑体 CN Normal',sans-serif">端电容是否正确：</span></p><p style="margin-top:5px;margin-right:0;margin-bottom:5px;margin-left:57px"><span style=";font-family:'思源黑体 CN Normal',sans-serif">万用表选择“电容档”。找到逆变</span>IGBT <span style=";font-family:'思源黑体 CN Normal',sans-serif">模块的</span>G.E<span style=";font-family:'思源黑体 CN Normal',sans-serif">端，然后测试</span>6<span style=";font-family:'思源黑体 CN Normal',sans-serif">个</span>IGBT<span style=";font-family:'思源黑体 CN Normal',sans-serif">的</span>G.E<span style=";font-family:'思源黑体 CN Normal',sans-serif">端容值。</span></p><p style="margin-top:5px;margin-right:0;margin-bottom:5px;margin-left:57px"><strong><span style=";font-family:'思源黑体 CN Normal',sans-serif">☞</span></strong><strong><span style=";font-family:'思源黑体 CN Normal',sans-serif">判定标准：</span></strong><span style=";font-family:'思源黑体 CN Normal',sans-serif">逆变</span>IGBT<span style=";font-family:'思源黑体 CN Normal',sans-serif">模块</span>G.E<span style=";font-family:'思源黑体 CN Normal',sans-serif">端正常电容值为几十</span>nF<span style=";font-family:'思源黑体 CN Normal',sans-serif">，也可以采用多个模块对比的方法，如果每个模块电容值基本接近，说明是良品；如果若</span>IGBT<span style=";font-family:'思源黑体 CN Normal',sans-serif">损坏，</span>G.E<span style=";font-family:'思源黑体 CN Normal',sans-serif">端结电容很大或接近于</span>0<span style=";font-family:'思源黑体 CN Normal',sans-serif">，或等于</span>0<span style=";font-family:'思源黑体 CN Normal',sans-serif">。</span></p><p class="MsoListParagraph" style="margin-top:5px;margin-right:0;margin-bottom: 5px;margin-left:28px;text-indent:0">C、 <span style=";font-family:'思源黑体 CN Normal',sans-serif">测试</span>UVW<span style=";font-family:'思源黑体 CN Normal',sans-serif">相间阻抗和对地（机壳）阻抗是否异常。</span></p><p class="MsoListParagraph" style="margin-top:5px;margin-right:0;margin-bottom: 5px;margin-left:67px">c) <span style=";font-family:'思源黑体 CN Normal',sans-serif">万用表电阻档测定</span>U-V<span style=";font-family:'思源黑体 CN Normal',sans-serif">、</span>U-W<span style=";font-family:'思源黑体 CN Normal',sans-serif">、</span>V-W <span style=";font-family:'思源黑体 CN Normal',sans-serif">之间的电阻，确认输出端子间是否存在短路情况。</span></p><p style="margin-top:5px;margin-right:0;margin-bottom:5px;margin-left:57px"><strong><span style=";font-family:'思源黑体 CN Normal',sans-serif">☞</span></strong><strong><span style=";font-family:'思源黑体 CN Normal',sans-serif">判定标准：</span></strong><span style=";font-family:'思源黑体 CN Normal',sans-serif">正常相间阻抗都在</span>MΩ<span style=";font-family:'思源黑体 CN Normal',sans-serif">级，阻抗过低说明</span>IGBT<span style=";font-family:'思源黑体 CN Normal',sans-serif">模块存在问题。</span></p><p class="MsoListParagraph" style="margin-top:5px;margin-right:0;margin-bottom: 5px;margin-left:67px">d) <span style=";font-family:'思源黑体 CN Normal',sans-serif">万用表电阻档测试</span>UVW<span style=";font-family:'思源黑体 CN Normal',sans-serif">端子与地（变频器机壳）之间的阻抗。</span></p><p style="margin-top:5px;margin-right:0;margin-bottom:5px;margin-left:57px"><strong><span style=";font-family:'思源黑体 CN Normal',sans-serif">☞</span></strong><strong><span style=";font-family:'思源黑体 CN Normal',sans-serif">判定标准：</span></strong><span style=";font-family:'思源黑体 CN Normal',sans-serif">正常阻抗为</span>MΩ<span style=";font-family:'思源黑体 CN Normal',sans-serif">级，如果阻抗较低（如几十</span>Ω<span style=";font-family:'思源黑体 CN Normal',sans-serif">或几百</span>kΩ<span style=";font-family:'思源黑体 CN Normal',sans-serif">）或阻抗接近零，则</span>IGBT<span style=";font-family:'思源黑体 CN Normal',sans-serif">模块损坏。</span></p><p style="margin-top:5px;margin-right:0;margin-bottom:5px;margin-left:0">IGBT<span style="font-family:'思源黑体 CN Normal',sans-serif">是否异常的总体判定标准：以上</span>ABC<span style="font-family:'思源黑体 CN Normal',sans-serif">三个条件，任何一个不满足相应的判定标准，则</span>IGBT <span style="font-family:'思源黑体 CN Normal',sans-serif">模块即可能损坏，可更换相应的</span>IGBT <span style="font-family:'思源黑体 CN Normal',sans-serif">模块确认问题是否解决。</span></p><p><br/></p>
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