An Approximate Mathematical Expression for Nonlinear Resistive Properties of Metal Oxide Varistor Elements for FDTD Simulations
An Approximate Mathematical Expression for Nonlinear Resistive Properties of Metal Oxide Varistor Elements for FDTD Simulations
复制标题
DOI：
10.1109/temc.2020.2983200
复制
发表时间：
2020-12
影响因子：
2.1
通讯作者：
Tokuya Tanaka;Ryosuke Tsuge;Y. Baba;Yoshimasa Tsujimoto;N. Tsukamoto
中科院分区：
文献类型：
--
作者：
Tokuya Tanaka;Ryosuke Tsuge;Y. Baba;Yoshimasa Tsujimoto;N. Tsukamoto
提出了一种金属氧化物压敏电阻 (MOV) 元件非线性电阻特性的简单数学表达式，用于使用时域有限差分 (FDTD) 方法进行电磁和浪涌仿真。 MOV 元件的非线性电阻特性是通过实验获得的电压与电流 (V-I) 特性。 V-I 特性转换为电阻率与电场 (ρ-E) 特性。 ρ-E 特性通过具有三个可调常数的简单数学表达式来近似，可以使用最小二乘法轻松确定其值。所提出的简单 ρ-E 表达式在 FDTD 模拟中非常有用，因为它可以很好地近似测量的 ρ-E 特性并且不需要迭代计算。
A simple mathematical expression for nonlinear resistive properties of metal oxide varistor (MOV) elements is proposed for electromagnetic and surge simulations using the finite-difference time-domain (FDTD) method. The nonlinear resistive properties of MOV elements are obtained experimentally as the voltage versus current (V–I) characteristics. The V–I characteristics are converted to the resistivity versus electric field (ρ–E) characteristics. The ρ–E characteristics are approximated by the simple mathematical expression with three adjustable constants, the values of which can be easily determined with the least square method. The proposed simple ρ–E expression is of great use in FDTD simulations since it can approximate measured ρ–E characteristics reasonably well and requires no iterative computations.