空气静电放电的场路协同仿真研究

Field-Circuit Co-Simulation of Air Electrostatic Discharge

场路协同仿真方法可耦合场与路研究空气静电放电的非线性特征,有助于静电放电防护的进一步改进。基于CST仿真软件,首先通过静电放电发生器标准电流测试模型对场路协同仿真方法进行验证,然后利用该方法将静电放电发生器的3D全波模型和非线性电弧模型相结合,探究放电电流随激励电压和放电弧长的变化关系。仿真结果表明:放电上升时间和峰值电流均随着激励电压和弧长指数变化,而小弧长情况下与接触放电类似接近线性变化;而结合实验中电弧长度随电压变化的特性,得出激励电压、电流峰值和上升时间的定量关系。仿真结果和文献中的实验结果相吻合,同时场路协同仿真可获得任一时刻的场分布信息,对电子设备的故障检测具有指导意义。

Field-circuit co-simulation method can couple the field and the circuit to study the nonlinear characteristics of air electrostatic discharge, which is helpful for further improvement of electrostatic discharge protection. Based on CST simulation software, first using electrostatic discharge(ESD)generator standard current test model to verify this field-circuit co-simulation method is proposed, then the ESD generator 3 D full-wave model and nonlinear arc model to explore the relationship of discharge current with excitation voltage and discharge arc length are combined. The simulation results indicate that the rise time and peak discharge current change exponentially with the excitation voltage and arc length, while the change is close to linear similar to the contact discharge mode in the case of small arc length. Combined with the characteristics of arc length varying with voltage in the experiment, the quantitative relationship between excitation voltage, current peak value and rise time is obtained. The simulation results are consistent with the experimental results in the literature. At the same time, the field circuit co-simulation can obtain the field distribution information at any time, which is of guiding significance for the fault detection of electronic equipment.