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首页> 外文期刊>IEEE Transactions on Dielectrics and Electrical Insulation >Observations of breakdown through printed circuit board polymer coatings via a surface pollution layer
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Observations of breakdown through printed circuit board polymer coatings via a surface pollution layer

机译：通过表面污染层对印刷电路板聚合物涂层进行击穿的观察

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摘要

Evidence is presented of breakdown through a conductive surface pollution layer on silicone conformal coated boards at much lower voltages than would be expected between tracks through the bulk polymer coating. The preferential breakdown path is governed by the ratio between track separation and the thickness of coating. Finite element analysis has shown that the electric field strength can increase by a factor of ten above a 100 μm silicone coated energised track as a result of the presence of a conductive pollution layer above the coating. Experimental observations also revealed that the conductivity of the pollution does not affect breakdown voltage (when discharging through the pollution layer) for pollution conductivities of 2500 μ8 cm and greater. These observations are relevant to applications where the surface of coated power electronics boards can become contaminated and are expected to operate at high voltages.
机译：证据表明，在有机硅保形涂层板上的导电表面污染层击穿所导致的击穿电压远低于通过本体聚合物涂层的走线之间的电压。优先击穿路径由走线间距和涂层厚度之比决定。有限元分析表明，由于涂层上方存在导电污染层，电场强度可以比100微米有机硅涂层的通电轨迹高十倍。实验观察还表明，对于2500μ8cm或更大的污染电导率，污染的电导率不会影响击穿电压（通过污染层放电时）。这些观察结果与涂覆的电力电子板的表面可能会被污染并有望在高压下运行的应用有关。

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