非屏蔽电缆束的串扰抑制措施研究

Research on crosstalk suppression measures for unshielded cables

随着电子系统和电气设备的高度集成化以及对信号传输需求的增加,电缆线束越来越密集,使其周围的电磁环境越来越复杂,恶劣的电磁环境会导致一系列的电磁兼容性问题.基于多导体传输线理论结合级联传输线方法,通过链路参数矩阵得到非屏蔽电缆束模型,基于该模型的仿真结果与电磁场仿真软件CST(CST Studio Suite)仿真结果进行对比,验证了本文所建立仿真模型的正确性.重点研究电缆束的线缆数量、线缆端接阻抗以及线缆在电缆束中的层位置对线间串扰的影响,并提出相应的抗干扰措施.特别是对于线缆端接阻抗的研究,提出“牺牲电缆”的概念,即选取一根线缆作为“牺牲电缆”,两端接较小负载,以抑制电缆束的线间串扰.

With the increasing integration of electronic systems and electrical equipment and the rising demand for signal transmission,cables are becoming increasingly dense.This makes the surrounding electromagnetic environment more and more complex,and the harsh electromagnetic environment will lead to a series of electromagnetic compatibility problems.Based on the multi-conductor transmission line theory and the cascaded transmission line method,the unshielded cable model is obtained through the link parameter matrix.The simulation results based on this model are compared with the CST simulation results to verify the correctness of the established simulation model in this paper.This paper focuses on the influence of the number of cables,the cable termination impedance and the layer position of the cable in the cable bundles on the crosstalk among lines.And the corresponding antiinterference measures are proposed.In particular,for the study of cable termination impedance,the concept of“sacrificial cable”is proposed,that is,a cable is selected as the“sacrificial cable”,and a small load is connected at both ends to suppress the crosstalk among the cables.