一种快速测试线缆终端共模阻抗的方法

刘洪颐; 陈尧; 苏东林

doi:10.13700/j.bh.1001-5965.2017.0626

一种快速测试线缆终端共模阻抗的方法

doi: 10.13700/j.bh.1001-5965.2017.0626

北京航空航天大学电子与信息工程学院, 北京 100083

基金项目:

国家自然科学基金 61601016

国家自然科学基金 61427803

详细信息

作者简介:
刘洪颐  男, 博士研究生。主要研究方向:电磁兼容与电磁环境效应、电磁散射

陈尧  男, 硕士, 讲师。主要研究方向:电磁兼容测试、电磁兼容设计

苏东林  女, 博士, 教授。主要研究方向:自顶向下系统级电磁兼容设计、电磁环境效应

通讯作者:
苏东林, E-mail: SDL@buaa.edu.cn

中图分类号: V241.09;TM154
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- 被引次数: 0
出版历程
- 收稿日期: 2017-10-13
- 录用日期: 2017-11-17
- 网络出版日期: 2018-08-20

A method for quick measurement of terminal common-mode impedance of cables

School of Electronic and Information Engineering, Beijing University of Aeronautics and Astronautics, Beijing 100083, China

Funds:

National Natural Science Foundation of China 61601016

National Natural Science Foundation of China 61427803

More Information

Corresponding author: SU Donglin, E-mail: SDL@buaa.edu.cn

摘要

摘要:
航空电子设备之间的互联线缆是电磁干扰耦合的重要路径。对线缆耦合进行建模分析时，线缆终端共模阻抗是至关重要的输入参数。而航电系统线缆数量较多，提高线缆终端共模阻抗的测试效率，有利于快速建立线缆耦合模型。为此，提出了一种快速测试线缆终端共模阻抗的方法。首先，根据多导体传输线理论证明，在分析共模电流时可以将多芯线缆等效为一根单导体。进而，将线缆束等效为多导体传输线，并采用矢量网络分析仪和电流探头测量各条线缆2个任选位置处的电压反射系数。然后，基于所建立的多导体传输线模型，构造以终端阻抗为未知数的方程组。最后，采用数值迭代算法求解该方程组，得到各条线缆的终端共模阻抗。与现有方法相比，所提方法提高了测试效率和测试精度。
- 电磁兼容(EMC) /
- 多导体传输线 /
- 共模 /
- 航空电子设备 /
- 线缆 /
- 终端阻抗 /
- 测试
Abstract:
The cables connecting avionics equipment are important coupling path for electromagnetic interference. When modeling a cable, the terminal common-mode impedance of the cable is a crucial input parameter. Because the quantity of cables in avionics system is very large, it is beneficial for quickly modeling cables' coupling through improving the test efficiency of cable terminal common-mode impedance. Therefore, a method to quickly test the terminal common-mode impedances of cables is proposed. First, according to the theory of multi-conductor transmission line, the multi-core cable can be equivalent to a single conductor when the common-mode current is analyzed. In addition, a cable bundle can be equivalent to a multi-conductor transmission line, and a vector network analyzer and a current probe can be used to measure the voltage reflection coefficients at two optional positions of each cable. Then, based on the established model of multi-conductor transmission line, the terminal impedance equations are constructed. Finally, the numerical iterative algorithm is used to solve the equations, and the terminal common-mode impedance of each cable is extracted. Compared with the existing methods, the testing efficiency and accuracy are improved.
- electromagnetic compatibility (EMC) /
- multi-conductor transmission line /
- common-mode /
- avionics equipment /
- cable /
- terminal impedance /
- measurement

HTML全文

图 1 连接2个终端的3条线缆

Figure 1. Three cables connecting two terminals

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图 2 多芯线缆及其等效导体横截面结构尺寸

Figure 2. Cross section structure of a cable bundle and its equivalent conductor.

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图 3 与3条线缆等效的多导体传输线

Figure 3. Equivalent multi-conductor transmission line of three cables

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图 4 测量导体i在x_isL处的电压反射系数

Figure 4. Measuring voltage reflection coefficient at x_isL of conductor i

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图 5 测量导体电压反射系数的等效电路

Figure 5. Equivalent circuit for measuring voltage reflection coefficient of a conductor

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图 6 本文所用电流探头的电压变换比曲线

Figure 6. Voltage conversion ratio curve of current probe used in this paper

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图 7 导体与地平面间的4个输入阻抗

Figure 7. Four input impedances between conductor and ground

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图 8 由本文方法和直接测量得到的|z_1a|、|z_2a|、|z_3a|、|z_1b|、|z_2b|和|z_3b|

Figure 8. |z_1a|, |z_2a|, |z_3a|, |z_1b|, |z_2b| and |z_3b| achieved with proposed method and direct measurement

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