电快速脉冲群引起的辐射电磁干扰机理分析及其应用

发布时间：2018-05-05 11:52

本文选题：电磁兼容 + 电磁抗干扰　；参考：《南京师范大学》2014年硕士论文

【摘要】：随着高速数字印刷电路、无线射频识别系统以及射频器件的迅速发展,电子设备产生的大量电磁抗干扰的情况,严重影响其它设备的正常运行,甚至出现误操作等问题。本文的研究是建立在国家质检总局科研项目《满足电能表型式评价的电磁兼容测试要求的电能表检测装置的研制(编号2011QK127)》子项目上的。针对目前电气电子产品抵抗“电快速脉冲群干扰”时偏重抑制传导耦合干扰,而忽略辐射空间干扰也会使得产品失效这一现状,本文以电快速脉冲群引起的辐射电磁干扰为研究对象。针对上述问题,本文开展了“电快速脉冲群引起的辐射电磁干扰机理分析及其应用”研究,包括以下四个部分： (1)分析了电快速脉冲群机理特性,包括电快速脉冲群形成机理、脉冲群频谱分析、能量的传送与损耗分析,以及基于串扰耦合和电磁场模型两种方式的辐射电磁干扰形成机理。 (2)建立了电快速脉冲群引起的辐射电磁干扰数值计算模型,在分析简化电快速脉冲群抗干扰测试现场布置的基础上建模,利用全波算法的时域有限积分进行了电磁场仿真。借助CST MWS(?)仿真软件,得到的计算结果,定量的表明了辐射电磁噪声的存在。 (3)设计了电快速脉冲群引起的辐射电磁干扰测量验证实验,针对数值计算与仿真结果的有效性选取了多组测试点完成了测量实验,其测量结果与仿真结果做到了呼应,同时也分析了仿真计算与实际测量之间的误差来源。 (4)采用上述研究基础,解决了电快速脉冲群抗干扰的2个工程应用实例,包括小型直流有刷电机脉冲群干扰整改和智能开关控制器抗脉冲群干扰设计,采取的抑制措施涵盖了EFT滤波器和屏蔽外壳等。理论分析与实验结果表明,电快速脉冲群的干扰途径中确实存在借助辐射空间耦合的,且具有一定的强度。虽然这个强度不能和辐射电磁抗干扰完全的等同,但也为工程师在产品的电磁兼容性设计时提供了参照。
[Abstract]:With the rapid development of high speed digital printed circuit, radio frequency identification system and radio frequency device, the large amount of electromagnetic anti-interference caused by electronic equipment seriously affects the normal operation of other equipment and even misoperation. The research of this paper is based on the research project of the State Quality Inspection Administration (AQSIQ) to meet the type of energy meter type evaluation. The development of the electric energy meter testing device (number 2011QK127), which is required by the electromagnetic compatibility test, is on the sub project. In view of the current electrical and electronic products' resistance to the "electric fast pulse group interference", the current situation that the product will be invalidation will be ignored by the neglect of the radiation space interference. EMI is the object of study.
In view of the above problems, this paper has carried out the research on the mechanism and application of electromagnetic interference caused by electrical fast pulsed group, including four parts:
(1) the mechanism characteristics of the electric fast pulse group are analyzed, including the formation mechanism of the electric fast pulse group, the spectrum analysis of the pulse group, the transmission and loss analysis of the energy, and the formation mechanism of the radiation electromagnetic interference based on the crosstalk coupling and the electromagnetic field model in two ways.
(2) the numerical simulation model of electromagnetic interference caused by electric fast pulse group is established. On the basis of analyzing the site layout of the simplified electric fast pulse group anti-interference test, the simulation of electromagnetic field is carried out by the time domain finite integral of the full wave algorithm. The results obtained by the CST MWS (?) simulation software show the radiant electricity quantificationally. The presence of magnetic noise.
(3) the test verification experiment of electromagnetic interference caused by electric fast pulse group is designed. According to the effectiveness of the numerical calculation and simulation results, a number of test points are selected to complete the measurement experiment. The measurement results are echoed with the simulation results, and the error sources between the simulation calculation and the actual measurement are also analyzed.
(4) using the above research basis, 2 engineering application examples of the electric fast pulse group anti-interference are solved, including the small DC brushed motor pulse group interference rectification and the intelligent switch controller anti pulse group interference design. The suppression measures cover the EFT filter and the shielded outer shell.
The theoretical analysis and experimental results show that the interference approach of the electric fast pulse group does have the aid of the coupling of the radiation space and has a certain strength. Although the intensity can not be equivalent to the radiation electromagnetic interference, it also provides a reference for the engineers to set the timing of the electromagnetic compatibility of the products.

【学位授予单位】：南京师范大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN972

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