双绞线的模式转换特性对车载以太网EMI影响分析  

Analysis of the Influence of Mode Conversion Characteristics of Twisted Pair on Automotive Ethernet EMI

作　　者：张浩森 国晨 孙凯燚 范岩 郭建东 李民 Zhang Haosen;Guo Chen;Sun Kaiyi;Fan Yan;Guo Jiandong;Li Min(CAT ARC New Energy Vehicle Test Center(Tianjin)Co.,Ltd.,Tianjin 300300;Hebei Jiaotong Vocational and Technical College,Shijiazhuang 050035)

机构地区：[1]中汽研新能源汽车检验中心(天津)有限公司,天津300300 [2]河北交通职业技术学院,石家庄050035

出　　处：《中国汽车》2021年第10期47-52,共6页China Auto

摘　　要：车载以太网是一种连接车内电子单元的新型局域网技术。在单对非屏蔽双绞线上,车载以太网可实现100 Mbit/s甚至1Gbit/s的数据传输速率,满足汽车行业高可靠性、低电磁辐射、低功耗、带宽分配、低延迟以及同步实时性等方面的要求。与此同时,车载以太网也对其物理层提出了更高的要求。本文基于车载以太网链路的EMI测试,分析双绞线差模转共模特性对差分信号的影响,并对比使用不同类型双绞线时车载以太网通信产生的电磁发射,得出结论,平衡性良好的双绞线可以明显降低车载以太网通信时的电磁发射,提高信号的传输质量,在实际使用时能保证以太网的信号完整性,减小丢包率及误码率。Automotive Ethernet is a new type of local area network technology that connects electronic units in the vehicle. On a single pair of unshielded twisted-pair cables, automotive Ethernet can achieve data transmission rates of 100 Mbit/s or even 1 Gbit/s, meeting the requirements of the automotive industry for high reliability, low EMI, low power consumption, bandwidth allocation, low latency, and Synchronization and real-time requirements. At the same time, automotive Ethernet also puts forward higher requirements on its physical layer. Based on the EMI test of the vehicle-mounted Ethernet link, this article analyzes the influence of the differential-mode-to-commonmode characteristics of the twisted pair on the differential signal, and compares the electromagnetic emissions generated by the vehicle-mounted Ethernet communication when different types of twisted-pair cables are used. A twisted pair cable with good performance can significantly reduce electromagnetic emissions during communications.

关 键 词：车载以太网 电磁发射 共模-差模转换 差分平衡电缆 

分 类 号：TP3[自动化与计算机技术—计算机科学与技术]