FIREYE MBPF-200S
全新***，现货销售，欢迎来电咨询
在变频器不断发展的今天变频器驱动电路技术也是日新月异。驱动电路只是一个统称，其本身也经历了从插脚式元件的驱动电路到光耦驱动电路，再到厚膜驱动电路，以及比较新的集成驱动电路。一台变频器的好坏，驱动电路起着至关重要的作用。
1、驱动电路损坏的原因及检查
造成驱动损坏的原因是各种各样的，一般来说，出现的问题也无非是U、V、W三相无输出或输出不平衡，或输出平衡但是在低频时抖动，还有启动报警等。当一台变频器大电容后的快速熔断器断开，或者是IGBT逆变模块损坏的情况下，驱动电路基本都不可能完好无损，切不可换上好的快速熔断器或IGBT逆变模块，这样很容易造成刚换上的新器件再次损坏。
这时应该着重检查驱动电路上是否有打火的印记，可以先将IGBT逆变模块的驱动脚连线拔掉，用万用表电阻挡测量六路驱动是否阻值都相同（但是极个别的变频器驱动电路不是六路阻值都相同的，如三菱、富士等变频器）。如果六路阻值都基本相同也不能完全证明驱动电路是完好的，接着需要使用电子示波器测量六路驱动电路上电压是否相同。
当给定一个起动信号时六路驱动电路的波形是否一致，如果没有电子示波器，也可以尝试使用数字式电子万用表来测量驱动电路六路的直流电压。一般来说，未起动时的每路驱动电路上的直流电压约为10V，起动后的直流电压为2-3V，如果测量结果一切正常的话，基本可以判断此变频器的驱动电路是好的。
接着就将IGBT逆变模块连接到驱动电路上，但是记住在没有100%把握的情况下，***稳妥的方法还是将IGBT逆变模块的P从直流母线上断开，中间串联一组灯泡或一个功率大一点的电阻，这样能在电路出现大电流的情况下，保护IGBT逆变模块不被大电容的放电电流烧坏。
2、变频器驱动电路维修实例
⑴富士G9变频器
故障现象为上电无显示。估计可能是变频器开关电源损坏，打开变频器检查开关电源线路，但经检查，开关电源器件线路都无损坏，直流电压也无显示，这时要估计到可能是驱动问题。将驱动电路的所有电容拆下，发现有个别电容漏液，更换新的电解电容器，再次上电后正常工作。
⑵台达变频器
故障现象是变频器输出端打火，拆开检查后发现IGBT逆变模块击穿，驱动电路印制电路板严重损坏。正确的解决办法是先将损坏IGBT逆变模块拆下，拆的时候主要应尽量保护好印制电路板不受人为二次损坏。
将驱动电路上损坏的电子元器件逐一更换，将印制电路板上开路的线路用导线连起来（这里要注意要将烧毁的部分刮干净，以防再次打火）。在六路驱动电路阻值相同、电压相同的情况下使用示波器测量波形，但变频器一开就报OCC故障（台达变频器无IGBT逆变模块，开机会报警）使用灯泡将模块的P1和印制板连起来。
其他的用导线连，再次起动还报OCC，确定为驱动电路还有问题；逐一更换光耦合器，后发现该驱动电路的光耦合器带检测功能，其中一路光耦合器检测功能损坏，更换新的后，起动正常。
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