[变频空调维修]-第9章-模块故障-第8节-PFC板IGBT短路,使用硅桥代替PFC板方法

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第8节 PFC板IGBT短路,使用硅桥代替PFC板方法

故障说明

海信KFR-50LW/27BP柜式交流变频空调器开机后室外机无反应,检查为室外机主板和PFC板损坏。由于室外机主板无法修复只能更换,而PFC板由于作用不大并且价格太贵,更换没有实际意义,因此将其短接。

1.PFC板只有IGBT损坏

以海信KFR-50LW/27BP为例,假如PFC板上IGBT短路,而不想更换PFC板,按以下方法维修。

①更改引线方法。如图9-47所示,将PFC板上端子(CN05、DC OUT_+)正极输出(棕色)至滤波电容正极的引线,在滤波电容正极端子处拔下,这根引线不再使用。

再将滤波电感输出引线(棕色)在PFC板端子(CN04、L2)上拔下,直接连接滤波电容正极,这样硅桥正极输出经滤波电感后,直接送至滤波电容滤波,短接PFC板的IGBT调节功能,再开机就能正常使用。

图9-47 更改引线

图9-47 更改引线

②剪去IGBT引脚。如图9-48所示,在维修过程中如果对更换引线的方法掌握不好,可以使用偏口钳直接将IGBT的3个引脚直接剪断,使IGBT脱离PFC板,这样硅桥正极经滤波电感、PFC板上快恢复二极管至滤波电容正极,不更改任何引线也能排除故障,此方法适用于PFC板只是IGBT三极短路的故障。

图9-48 剪断IGBT的3个引脚

图9-48 剪断IGBT的3个引脚

2.PFC板控制电路损坏

如果由于2匹机型中集成硅桥的PFC板控制电路损坏,或3匹机型中PFC板控制电路损坏等原因,导致无法修复只能更换电路板时,若暂时没有配件或者不想更换PFC板,可以使用加装硅桥的方法来维修。本节以2匹机型海信KFR-50LW/27BP变频柜机为例进行介绍,3匹机型如果未集成硅桥,只需要拆除PFC板,利用原硅桥并更改引线即可。

①拆除引线。如图9-49左图所示,首先拆除PFC板上各种输入引线,然后选用合适的硅桥,本例选用型号为S25VB60,最大电流25A,最高反向电压600V,引脚作用如图9-49右图所示。

图9-49 拆除引线和硅桥

图9-49 拆除引线和硅桥

②安装硅桥输入端引线。如图9-50左图所示,将硅桥固定在原硅桥位置,并使用螺丝拧紧,使散热面紧紧贴在散热片上,以增强散热效果。

如图9-50右图所示,电源L相线(黑线)由室外机主板上主控继电器端子引出,电源N零线(灰线)由滤波器端子引出,将2根引线不分极性安装在硅桥的两个输入引脚。

图9-50 固定硅桥和安装交流输入引线

图9-50 固定硅桥和安装交流输入引线

③安装直流输出引线。如图9-51所示,将滤波电容负极引线另一端安装在硅桥负极引脚,硅桥正极引脚连接滤波电感的输入引线,输出引线连接滤波电容正极,这样硅桥正极经滤波电感连接滤波电容正极。

图9-51 安装硅桥直流输出引线

图9-51 安装硅桥直流输出引线

至此,引线全部更改结束。维修方法实际上就是拆除PFC板、更改引线,这时的电控系统和早期变频空调器(如海信KFR-2601GW/BP)相同,实际使用对电路没有任何影响。如果为3匹机型PFC板损坏,维修时直接拆除即可,硅桥不用更换,将连接引线按顺序接好,空调器也能正常使用。


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