Effect of shielding on electromagnetic crosstalk in double differential mode cable loop
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摘要: 屏蔽层在抑制电磁干扰应用中被广泛使用，但目前少有研究聚焦于屏蔽层对独立的功率回路与信号回路构成的双差模回路间电磁串扰的影响。提出了一种基于多导体传输线理论的双差模带屏蔽线缆回路间的串扰分析模型。该方法首先建立了多导体系统单位长度等效电路模型，然后利用有限差分的思想并依据基尔霍夫电压定律和电流定律列写出系统的传输线方程组，最后求解得到串扰结果。将计算结果与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。对感性耦合和容性耦合进行单独计算，研究了屏蔽层对线缆间串扰的影响，得到了抑制串扰的方法，可为实际应用中电缆选型以及屏蔽层接地方式的选择提供指导。Abstract: Shields are widely used in EMC applications because they can realize electromagnetic shielding, but few studies have focused on the effect of shields on electromagnetic crosstalk in a double differential mode loop, consisting of independent power loop and signal loop. A crosstalk analysis model based on the theory of multi-conductor transmission lines is proposed. In this method, the per-unit-length equivalent circuit model of the system is established, then the transmission line equations of the system are written by using the idea of finite difference and Kirchhoff’s voltage law and current law, and the crosstalk results are obtained finally. The crosstalk results are compared with the simulation results obtained by CST software to verify the feasibility and validity of the model and calculation method. Separate calculations of inductive coupling and capacitive coupling are carried out to study the effect of shielding layer on electromagnetic crosstalk between cables, and crosstalk suppression methods are obtained, which can provide guidance for the selection of cables and the selection of shield grounding method in practical engineering applications.
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图 1 无屏蔽功率电缆-带屏蔽信号电缆系统线缆分布示意图
Figure 1. Diagram of cable distribution for unshielded power cables and shielded signal cables system
图 2 无屏蔽功率电缆-带屏蔽信号电缆的七导体传输线系统等效电路模型
Figure 2. Equivalent circuit model of a seven-conductor transmission line system for the unshielded power cables and shielded signal cables system
图 3 无屏蔽功率电缆-带屏蔽信号电缆系统的线缆截面分布
Figure 3. Distribution of cable cross sections for the unshielded power cables and shielded signal cables system
图 4 无屏蔽功率电缆-带屏蔽信号电缆系统MATLAB与CST仿真结果对比
Figure 4. Comparison of MATLAB and CST simulation results for the unshielded power cables and shielded signal cables system
图 5 无屏蔽功率电缆-带屏蔽信号电缆系统不同屏蔽层接地方式下的感性和容性耦合系数
Figure 5. Inductive and capacitive coupling coefficients for the unshielded power cables and shielded signal cable system under different shield grounding methods
图 6 无屏蔽功率电缆-带屏蔽信号电缆系统不同屏蔽层接地方式下的总串扰
Figure 6. Total crosstalk for the unshielded power cables and shielded signal cable system under different shield grounding methods
图 7 带屏蔽功率电缆-无屏蔽信号电缆的七导体传输线系统分布示意图
Figure 7. Distribution of the seven-conductor transmission line system for a shielded power cables and unshielded signal cables system
图 8 带屏蔽功率电缆-无屏蔽信号电缆系统MATLAB 与CST仿真结果对比
Figure 8. Comparison of MATLAB and CST simulation results for the shielded power cables and unshielded signal cables system
图 9 带屏蔽功率电缆-无屏蔽信号电缆系统不同屏蔽层接地方式下的感性和容性耦合系数
Figure 9. Inductive and capacitive coupling coefficients for the shielded power cables and unshielded signal cables system under different shield grounding methods
图 10 带屏蔽功率电缆-无屏蔽信号电缆系统不同屏蔽层接地方式下的总串扰
Figure 10. Total crosstalk for a shielded power cables and unshielded signal cables system under different shield grounding methods
图 11 带屏蔽功率电缆-带屏蔽信号电缆的九导体传输线系统分布示意图
Figure 11. Distribution of the seven-conductor transmission line system for the shielded power cables and shielded signal cables system
图 12 带屏蔽功率电缆-带屏蔽信号电缆系统MATLAB与CST仿真结果对比
Figure 12. Comparison of MATLAB and CST simulation results for the shielded power cables and shielded signal cables system
图 13 带屏蔽功率电缆-带屏蔽信号电缆系统不同屏蔽层接地组合方式下的串扰
Figure 13. Crosstalk for the shielded power cables and shielded signal cables system under different shield grounding methods
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