Level Predictions and Its Reduction Method of Electromagnetic Fields Due to Electrostatic Discharge Causing Electromagnetic Interference to Information Communication Equipment

静电放电对信息通信设备产生电磁干扰的电磁场电平预测及其降低方法

• 批准号: 10837005
• 负责人: FUJIWARA Osamu
• 金额: $ 2.11万
• 依托单位: Nagoya Institute of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1998
• 资助国家: 日本
• 起止时间: 1998 至 1999
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10837005/
• 关键词: charged metal; ESD; electromagnetic interference; transient electromagnetic fields; FDTD method; image dipole; spark experiment; ferrite core

The transient electromagnetic fields due to electrostatic discharge (ESD) between charged metals have wide-band frequency spectra up to the microwave region, which cause serious malfunction to high-tech information devices. Such ESD fields are significantly affected by the presence of the metal, whereas the effect is not well understood. The head investigator of this research project previously developed a method for predicting the ESD fields using the finite-difference time-domain (FDTD) technique in conjunction with a spark current theoretically derived from the Rompe-Weizel spark resistance formula, which showed that the presence of the metal enhance the field level according to its dimension. The purpose of this research project is to develop computer simulation codes for the ESD fields based on the above findings, and is also to provide a technique for reducing the electromagnetic interference due to ESD fields. The outline of the results obtained in this research project was as f … More ollows. A spark model between two spherical metals being spaced at a gap was considered. The FDED method was used to compute the electromagnetic fields due to the spark between the metal spheres. Two types of spark gap excitation were investigated to differentiate the Maxwell equations concerning the ESD fields for the FDED computation algorithm. The excitation sources were a spark current and s spark voltage that were both obtained in closed forms from the Rompe-Weiziel formula for a spark resistance. As a result, we found that the current excitation is unable to compute the electric field waveform including the electrostatic field component before the ESD happens, while the voltage excitation modeling was confirmed by wide-band measurement of the magnetic field, good agreement was observed between the results that wave computed by the both excitations. The validity for the excitation modeling was confirmed by wide-band measurement of the magnetic field waveform due to a spark between metal balls. At present, we are constructing a new FDTD algorithm which enables us to predict the ESD fields caused by the spark between charged metals having arbitrary shapes, and also examine the effects of ferrite core attachment in reducing the ESD fields by charged metals. Less

带电金属间静电放电（ESD）产生的瞬态电磁场具有宽带频谱，可达微波频段，对高科技信息设备造成严重的故障。这种ESD场受金属存在的显著影响，而这种影响还没有得到很好的理解。该研究项目的首席研究员先前开发了一种方法，用于预测ESD场，使用时域有限差分（FDTD）技术结合火花电流理论上来自Rompe-Weizel火花电阻公式，这表明金属的存在根据其尺寸增强了场水平。本研究的目的是根据上述研究结果开发ESD场的计算机模拟代码，并提供一种减少ESD场引起的电磁干扰的技术。本研究项目所取得的成果概要如下： ...更多信息 奥洛斯。考虑了两个球形金属间的火花模型。采用FDED方法计算了金属球间火花产生的电磁场。研究了两种火花隙激励方式对静电放电场的麦克斯韦方程组的微分作用，并给出了静电放电场的FDED计算方法。激励源是火花电流和火花电压，它们都是从火花电阻的Rompe-Weiziel公式中以封闭形式获得的。结果表明，电流激励无法计算静电放电发生前的电场波形，而电压激励模型通过宽带磁场测量得到了验证，两者计算结果吻合较好。通过对金属球间火花产生的磁场波形的宽带测量，证实了激励模型的有效性。目前，我们正在构建一个新的FDTD算法，使我们能够预测静电放电场所造成的带电金属之间的火花具有任意形状，也研究铁氧体磁芯附件在减少静电放电场带电金属。少

项目成果

Al Zaher Samir: "Measurement and verification of complex permeability of ferrite material by S-parameter techniques"電気学会論文誌. 119-C(1). 9-14 (1999)

Al Zaher Samir：“通过 S 参数技术测量和验证铁氧体材料的复杂磁导率”，日本电气工程师学会汇刊 119-C(1) (1999)。

藤原修: "最新 電磁波の吸収と遮蔽(2.4 静電気放電)"日経技術図書(株). 501-504 (1999)

藤原修：“电磁波的最新吸收和屏蔽（2.4静电放电）”日经技术书籍有限公司501-504（1999）

T. Maekawa, Al Zaher Samir and O. Fujiwara: "Load Effect of Ferrite Core Attachment to Close Spaced Multiwires above a Ground Plane"Technical Report, IEICE. EMCJ99-94. 31-36 (1999)

T. Maekawa、Al Zaher Samir 和 O. Fujiwara：“铁氧体磁芯附件对地平面上方近距离多线的负载效应”技术报告，IEICE。

Al Zaher Samir: "Parameter determination of equivalent circuit for load effect due to ferrite core attachment"Proc.1999 International Symposium on EMC,Tokyo,Japan. 626-629 (1999)

Al Zaher Samir：“由于铁氧体磁芯附件造成的负载效应的等效电路的参数确定”Proc.1999 国际 EMC 研讨会，东京，日本。

Osamu Fujiwara: "FDTD analysis of electromagnetic fields due to spark between charged metals with ferrite material attachment"Proc. 1999 International Symposium on EMC, Tokyo, Japan. 134-137 (1999)

Osamu Fujiwara：“FDTD 分析由于带有铁氧体材料附件的带电金属之间的火花而产生的电磁场”Proc。