摘要
根据场线耦合理论,提出了比较距离概念。结合某型通信车电磁干扰的具体问题进行分析讨论,找出了其产生电磁干扰的原因是由于车载交换机本身内部PCB板设计不符合比较距离规定,提出了在车内交换机内部PCB上加装共模滤波器、改进车内电源滤波器盒的布局和接线等整改措施。整改后,通信车内设备满足电磁兼容测试的各项要求,设备间干扰减小到最低程度,整车测试也达标。
The concept of compared instance was proposed according 1o the coupling mechanism between transmission line and field. Combined with the practical EMI problem in a certain type of communication vehicles, the reason was analyzed that the EMI came from the PCB of on-vehicle communication switcher itself which does not conform to the role of compared instance. The correction and promotion way was proposed, snch as adding a choke fiher on the PCB, promoting the layout and links in power line EMI filtering box, etc. After adopting those correetion methods, the equipments met the z^quirements of EMC standards according its measurement items, because the EMI among equipments in vehicle reduced farthest, and the whole vehicle passed the test according to the standards.
基金
四川省教育厅重点项目(No.12ZA061)
关键词
通信车
场线耦合
比较距离
电磁兼容
整改
communication vehicle
coupling mechanism between transmission line and field
compared inslance
EMC
correclion
