共模电流扫描法在汽车电子部件电磁辐射预测中的研究与应用  

Research and Application on Common-Mode Current Scan Methods to Predict Radiated Emissions of Automotive Components

作　　者：贾晋 赖志达 王瑞妙 汪泉弟[4] Jia Jin;Lai Zhida;Wang Ruimiao;Wang Quandi(State Key Laboratory of Vehicle NVH and Safety Technology,Chongqing CAERI Quality Inspection and Authentication Center Co.Ltd,Chongqing 401122,China;Vehicle Engineering Institute Chongqing University of Technology,Chongqing 400054 China;State Grid Research Institute of Chongqing Electric Power Company,Chongqing 401123 China;State Key Laboratory of Power Transmission Equipment&System Security and New Technology Chongqing University,Chongqing 400044 China)

机构地区：[1]重庆凯瑞质量检测认证中心有限责任公司汽车噪声振动和安全技术国家重点实验室,重庆401122 [2]重庆理工大学车辆工程学院,重庆400054 [3]国网重庆市电力公司电力科学研究院,重庆401123 [4]输配电装备及系统安全与新技术国家重点实验室(重庆大学),重庆400044

出　　处：《电工技术学报》2018年第8期1674-1684,共11页Transactions of China Electrotechnical Society

摘　　要：汽车电磁兼容标准CISPR 25中的线性吸收屏蔽室(ALSE)测试法,又称天线法,需要昂贵的半波暗室作为测试环境。文中方法的主要测试量是线束上共模电流所产生的辐射电场,而线束上的共模电流能通过低成本的电流探头直接测量得到,因此基于线束共模电流测量的辐射发射预测成为可能。相对于ALSE测量法,该方法具有低成本,便利的优势。为了与标准的ALSE测试法在30~1 000MHz的测量结果进行对比,主要解决了三方面的问题:首先,通过对时域电流信号的快速傅里叶变换(FFT)或对频域电流幅值的拟合获取辐射预测所必需的共模电流相位;其次,基于多电偶极子的线束辐射模型与基于表面电流法的导电桌面辐射模型能有效地计算出共模电流所产生的辐射水平;最后,提出的校准方法能将ALSE实际测试环境因素考虑到预测结果中。多个不同的实际测试案例,验证了基于共模电流测量的辐射预测方法的可行性与实用性。Absorber lined shielded enclosure(ALSE)method of automotive electromagnetic compatibility(EMC)standard CISPR 25,also called the antenna method,requires a large anechoic chamber.However,the main measure of this method is the common-mode current distribution of the test cable bundle.Since this current distribution can be measured easily by current clamps that have much lower demands to the environment,it is possible to predict the level of radiated fields from the measured current distribution.This paper presents a field prediction method,which combines a measured common-mode(CM)current distribution with numerical computations for the radiated fields in the frequency range of 30~1 000MHz.Accordingly,three major problems can be solved compared with ALSE method.First,fast Fourier transform(FFT)based time-domain current or fitting algorithm based frequency-domain current amplitude can derive the needed phase distribution,for estimating the electric fields.Second,the radiation level produced by the common mode current can be calculated based on the common-mode radiation models of a cable bundle and a ground plate.Third,a calibration method is proposed to take into account the actual test environment of ALSE.Different solution approaches have verified the proposed prediction method.

关 键 词：线性吸收屏蔽室 天线法 CISPR25 辐射发射 线束 共模电流 相位 

分 类 号：TM15[电气工程—电工理论与新技术] O441[理学—电磁学]