基于散射参数法的EMI滤波器电磁噪声抑制效果预测

发布时间：2018-01-16 15:11

  本文关键词：基于散射参数法的EMI滤波器电磁噪声抑制效果预测　出处：《电工技术学报》2016年18期 　论文类型：期刊论文

  更多相关文章： EMI滤波器 差模噪声 共模噪声 阻抗不匹配 S参数

【摘要】：EMI滤波器是抑制传导噪声的重要手段之一,尤其是高性能的EMI滤波器的应用,对电力电子设备的干扰具有很好的抑制作用。基于传输线理论得到并联传输线的共模及差模参数,通过推导和测试得到噪声源阻抗、负载阻抗及其等效结构,求解得到基于阻抗法的插入损耗(IL)。但是,在高频条件下,EMI滤波器及传输线不仅存在自寄生参数,还存在互寄生参数,这些互寄生参数很难通过阻抗法来等效。本文在传输线等效共模与差模参数频率特性的基础上,根据传输线理论得到噪声源阻抗及负载阻抗;以共模滤波器为例,基于阻抗法预测滤波器对噪声的衰减能力,并与实际测试值进行比较。然而,由于阻抗法不能很好地预测高频条件下的噪声衰减,本文以波的"入射与反射"为核心,进一步提出一种利用S参数来预测阻抗不匹配条件下噪声衰减的方法,研究表明,散射参数法由于考虑了元件间的互寄生参数,具有更好的高频性能。
[Abstract]:EMI filter is one of the important methods to suppress conduction noise, especially the application of high performance EMI filter. Based on the transmission line theory, the common mode and differential mode parameters of the parallel transmission line are obtained, and the noise source impedance, load impedance and equivalent structure are derived and measured. The insertion loss based on impedance method is obtained. However, the EMI filter and transmission line have not only self-parasitic parameters, but also co-parasitic parameters at high frequency. These mutual parasitic parameters are difficult to be equivalent by impedance method. Based on the frequency characteristics of equivalent common mode and differential mode parameters of transmission line, the impedance of noise source and load impedance are obtained according to the theory of transmission line. Taking the common-mode filter as an example, the noise attenuation ability of the filter is predicted based on the impedance method, and compared with the actual test value. However, the impedance method can not predict the noise attenuation in the high frequency condition. Taking the incident and reflection of waves as the core, this paper proposes a method to predict the noise attenuation under the condition of impedance mismatch by using S parameters. The scattering parameter method has better high frequency performance because of considering the mutual parasitic parameters between elements.
【作者单位】： 江苏省新能源发电与电能变换重点实验室(南京航空航天大学);
【基金】：国家自然科学基金(51177071) 台达环境与教育基金会《电力电子科教发展计划》(DREK2013004) 江苏高校优势学科建设工程项目,南京航空航天大学研究生创新基地(实验室)开放基金(kfjj201412) 中央高校基本科研业务费专项资金资助项目
【分类号】：TN713
【正文快照】： 0引言根据国际电磁兼容标准,所有的电力系统及电力电子设备的电磁干扰均需在所选标准线以下。在150k Hz~30MHz间主要是传导干扰为主,而电磁干扰(Electromagnetic Interference,EMI)滤波器是抑制传导干扰的主要手段之一[1],因此,设计合适的滤波器不仅有利于抑制噪声,使其满足抑，

本文编号：1433644