Breakdown phenomena across micrometer scale surface gap under negative voltage application
Breakdown phenomena across micrometer scale surface gap under negative voltage application
复制标题
DOI：
10.1109/tdei.2019.007921
复制
发表时间：
2019-10
影响因子：
3.1
通讯作者：
H. Iwabuchi;T. Oyama;A. Kumada;K. Hidaka
中科院分区：
文献类型：
--
作者：
H. Iwabuchi;T. Oyama;A. Kumada;K. Hidaka
随着电气器件的小型化，绝缘宽度和电极之间的间距也相应减小。因此，微米级间隙的电击穿对于绝缘设计具有很大的实际意义。本文研究了非均匀场下大气中微米级表面间隙的电击穿。在负脉冲电压下测量击穿情况，并基于PIC-MCC（蒙特卡罗碰撞的粒子在细胞中）模拟中性粒子和带电粒子的产生和运动。结果表明，微米级间隙的击穿现象主要由阴极表面的场发射电流决定，类似于真空中的放电过程。电子与中性粒子碰撞产生的正离子增强了阴极附近的电场，导致阴极的场发射电流增加。
With the miniaturization of electrical devices, the insulation width and the separation between electrodes have been accordingly reduced. Consequently, electrical breakdown across micrometer-scale gaps is of great practical interest for insulation design. In this paper, electrical breakdown across micrometer scale surface gap in atmospheric air was investigated under inhomogeneous field. The breakdown was measured under negative impulse voltage and the generation and movement of neutral and charged particles were simulated based on PIC-MCC (particle-in-cell with Monte Carlo collision). The result shows that the breakdown phenomena across micrometer scale gaps is mainly determined by field emission current from the cathode surface, similar to the discharge process in vacuum. The positive ions generated by collision of electrons to neutral particles enhance the electric field near the cathode, resulting in the increase of the field emission current from the cathode.