Modeling of voltage-limiting kinetics in two-layer varistor–posistor structures

IF 1.7 4区 材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY
Alexander Sergeevich Tonkoshkur, Alexander Vladimirovich Ivanchenko
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引用次数: 0

Abstract

Purpose The purpose of this study is to model the dependences of the output voltage, temperature, current and electrical power dissipation of a voltage limiter based on a two-layer varistor–posistor structure on time and analysis the influence of operating modes and design parameters of such a limiter on these characteristics. Design/methodology/approach The behavior of the limiting voltage, temperature and other parameters of the voltage limiter when an input constant overvoltage is applied is studied by the simulation method. The voltage limiter was a two-layer construction. One layer was a zinc oxide ceramic varistor. The second layer was a posistor polymer composite with a nanocarbon filler of PolySwitch technology. Findings The output voltage across the varistor layer decreases and reaches some fixed value related to its breakdown voltage after applying a constant overvoltage to the structure over time. The temperature of the structure increases to some steady state value, while the current decreases significantly. The amplitude of the transient current pulse increases, its duration and energy of the transient process decrease with increasing overvoltage. An increase in the internal resistance of the overvoltage source can cause a decrease in the amplitude and an increase in the duration of transient currents. Originality/value The ranges of values for the activation energy of conduction of the varistor layer in weak electric fields, the intensity of heat exchange between the structure under study and the environment are determined to ensure the stable operation of this structure as a voltage limiter. The results obtained make it possible to select the necessary parameters of the indicated structures to ensure the required operating modes of the voltage limiter for various applications.
双层压敏-正极器结构的限压动力学建模
本研究的目的是建立基于双层压敏-正极器结构的限幅器输出电压、温度、电流和功耗对时间的依赖关系模型,并分析限幅器的工作模式和设计参数对这些特性的影响。采用仿真方法研究了输入恒过电压时限压器的极限电压、温度和其他参数的变化规律。电压限制器是两层结构。其中一层是氧化锌陶瓷压敏电阻。第二层是一种含有纳米碳填料的正极聚合物复合材料。结果:在对结构施加恒定过电压后,随着时间的推移,压敏电阻层的输出电压降低并达到与其击穿电压相关的固定值。结构的温度升高到某个稳态值,而电流明显减小。随着过电压的增加,瞬态电流脉冲的幅值增大,瞬态过程的持续时间和能量减小。过电压源内阻的增加会导致瞬态电流的幅度减小和持续时间的增加。确定压敏电阻层在弱电场下的导通活化能的取值范围,以及所研究结构与环境之间的热交换强度,以保证该结构作为限压器的稳定运行。所获得的结果使选择所指示结构的必要参数成为可能,以确保各种应用所需的限压器的工作模式。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
3.70
自引率
5.00%
发文量
60
期刊介绍: Multidiscipline Modeling in Materials and Structures is published by Emerald Group Publishing Limited from 2010
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