引发电控模块短路之PCB孔口发黑原因研究

PCB在使用过程中在经常会出现短路故障,对相关故障电子模块进行分析时发现模块PCB较多孔口存在发黑物质,严重者出现黑色物质连孔,通过测试确认黑色物质具有导电功能。本文通过理论分析及模拟实验论证,确认了黑色物质是引发电子模块故障的根源,同时明确了其产生机理,并提出了针对性的预防措施。

Reason research on PCB orifice blackening phenomenon which caused electronic control module short-circuit

PCB short-circuit fault often occurred during use. It was found there was black substance around many holes of PCB when we analyzed the fault module. In some severe cases, connected holes occurred. The module ran normally again by removing the black substance. The black substance with conductivity was confirmed by test. In the paper, we confirmed that the black substance was the root cause of the electronic module failures through theoretical analysis and simulation experiments demonstrated. The generation mechanism was clarified and targeted preventive measures were proposed also.