Research on electromagnetic crosstalk in double differential mode unshielded cable loop
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摘要: 随着电气化的发展，电气与电子系统中的电磁兼容问题越来越被重视，为了消除或抑制电磁耦合的影响，实现设备或元件电磁兼容的工作，有必要对线缆间的串扰进行研究。但目前少有相关研究关注独立的发射回路与接收回路构成的双差模回路间的电磁串扰问题。提出了一种基于多导体传输线理论的五导体传输线模型，并基于此研究了双差模非屏蔽线缆回路间的串扰问题。该方法根据耦合机理，首先建立单位长度五导体传输线等效模型，然后根据有限差分的方法列写基尔霍夫方程组，最后补充边界条件后求解得到串扰的频域解。将串扰计算结果与CST软件仿真结果进行对比，验证了该模型和计算方法的可行性与有效性，经计算分别研究了感性耦合与容性耦合，分析得到了不同因素对线束间串扰的影响规律，可为实际工程中采取措施抑制线缆间串扰提供指导，体现出该模型的先进性。Abstract: With the development of electrification, it has been paid more and more attention to the electromagnetic compatibility in electrical and electronic systems. To suppress the effects of electromagnetic interference and achieve electromagnetic compatible operation of equipment or components, it is necessary to research the crosstalk between cables. However, few researches have focused on the electromagnetic crosstalk between double differential mode loops consisting of a generator loop, a receptor loop, and the ground. In this paper, a five-conductor transmission line model based on the multi-conductor transmission line theory is proposed, and the crosstalk between double differential mode unshielded cable loops is researched based on it. According to the coupling mechanism, the method firstly establishes the equivalent model of unit-length five-conductor transmission line, then writes the system of Kirchhoff equations according to the method of finite difference, and finally solves the equations after supplementing the boundary conditions to obtain the crosstalk in the frequency domain. The crosstalk calculation results are compared with the simulation results of CST software to verify the feasibility and validity of the model and calculation method. The inductive coupling and capacitive coupling are studied respectively by the calculation, and the influence laws of different factors on the cable crosstalk are obtained by calculation and analysis, which can provide guidance for taking measures to suppress cable crosstalk in practical engineering.
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图 1 五导体传输线系统线缆分布示意图
Figure 1. Diagram of cable distribution in five-conductor transmission line system
图 2 五导体传输线系统等效电路模型
Figure 2. Equivalent circuit model of a five-conductor transmission line system
图 3 五导体传输线系统的离散模型
Figure 3. Discrete model of a five-conductor transmission line system
图 4 五导体传输线系统线缆的截面分布
Figure 4. Cross-sectional distribution of cables for a five-conductor transmission line system
图 6 不同功率回路负载电阻下的串扰系数
Figure 6. Crosstalk coefficients at different power circuit load resistance
图 8 不同信号电缆间距离的串扰系数
Figure 8. Crosstalk coefficient at different distance between signal cables
图 9 不同功率电缆间距离的串扰系数
Figure 9. Crosstalk coefficient at different distance between power cables
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