提出了一种基于多端口网络理论的EMC预测方法,能够实现复杂系统内多干扰源/敏感设备并存情况下的EMC预测.应用该方法进行复杂系统EMC预测时,将系统内部耦合作为多端口网络,将由电器部件构成的干扰源或敏感设备统一为网络端口处理,由网络耦合特性和端口特性进行系统级EMC预测.同时,给出了系统级EMC的预测方法,以及预测所需的网络耦合特性和端口等效特性的建模方法,并通过预测电动汽车电机系统对车载天线末端的骚扰电压,来对所提出方法的有效性进行验证.%This paper introduces EMC prediction techniques based on the multi-port network theory,which can realize EMC predictions in complex systems with multiple interference sources or sensitive equipment.In the application,couplings of the systems are used as the multi-port network while the interference sources or sensitive equipment composed of electrical components are regarded as network ports,then predictions are based on the characteristics of both the network couplings and the ports.In addition,it introduces detailed prediction techniques as well as the modeling methods for the characteristics of network couplings and the equivalent characteristics of ports.The effectiveness of the techniques has been verified by predicting the disturbance voltage at the end of the vehicle mounted antenna caused by the motor system of an electric automobile.
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