基于状态方程法的不同ESD电路对比分析

Comparison and analysis for different ESD circuits using state equations

针对IEC 61000-4-2中规定的典型静电放电(electrostatic discharge,ESD)电流波形存在拟合多样性且不易通过具体电路实现这一问题,采用求解电路状态方程组的方法对四种ESD模拟器电路进行了计算.得到了四种指数形式的ESD电流解析表达式,绘制了相应的电流曲线,分别讨论了四种ESD模拟器电路产生的ESD电流波形解析式的连续性和可导性,并对不同电路产生的ESD电流波形与IEC 61000-4-2标准规定电流波形之间的差异进行了对比分析.结果表明不同ESD电路产生的电流波形的四个主要指标符合IEC 61000-4-2标准规定,但由于电路的拓扑结构和元件参数不同,求得的电流波形解析式的连续性和可导性存在差异,因此在选择ESD模型时,应根据实际的人体参数和放电枪参数确定合适的电路结构.该计算方法适用于求解集总参数电路,为ESD电磁脉冲辐射场仿真计算提供了新的电流解析式.

According to the typical electrostatic discharge,namely as electrostatic discharge（ESD）,current waveform in IEC 61000-4-2,the current waveform has a variety of fitting and is not easy to realize this problem through specific circuit.The method of solving circuit state equations is used to calculate the four ESD simulator circuits,and four exponential forms of ESD current analytical expression are obtained.The corresponding current curve is drawn.The continuity and conductance of the analytical expression of the ESD current waveform produced by four ESD simulator circuits are discussed respectively.The difference between the ESD current waveform produced by different circuits and the difference between the current waveform of the IEC 61000-4-2 standard and the current waveform of the IEC is compared.The results show that four main current waveforms produced by different ESD circuits are in accordance with the IEC 61000-4-2 standard.However,the continuity and conductance of the current waveforms are different because of the different topology and component parameters of the circuit.Therefore,the actual human parameters and discharge guns should be based on the actual parameters when selecting the ESD model.The parameters determine the appropriate circuit structure.The calculation method is suitable for solving the lumped parameter circuit and provides a new current analytical formula for the simulation and calculation of the ESD electromagnetic pulse radiation field.