基于优势效应理论的双绞线简化建模

一些学者对双绞线电磁干扰进行研究,建立了精确的干扰模型,但并不适合工程应用.为此根据电磁兼容优势效应理论,推导出双绞线传导干扰主要由差模电流引起,辐射干扰主要由共模电流引起.分别利用广义二端口网络模型和电流元分析方法建立双绞线串扰和辐射的简化模型,从而有效估算双绞线串扰电压和对外辐射场的大小,最后给出滤波连接器的选择方法,为工程人员采取有效措施抑制互连设备电磁干扰提供了理论帮助.

Simple Modeling of Twisted-Pair Wires Based on Dominant Effect Theory

For the EMI in twisted-pair wires,accurate interference models have been set up by some scholars.However they can't be used in engineering.Based on dominant effect theory in EMC,the conducted EMI and radiated emissions of twisted-pair wires are mainly due to differential-mode currents and common-mode currents,respectively.A simple crosstalk model is established using broad two port network theory and the radiation leakage field is computed by taking advantage of current element.So predictions of the crosstalk voltage and radiated emissions can be easily made.Finally the choosing method of filter connector is given. All these offer valuable guidance for the engineers to take effective measures to reduce the total EMI of interconnecting equipment.