Equivalent Model for Estimating Common-mode Noise in Complicated Systems

针对复杂系统中的共模噪声问题，提出了一种等效模型，用于分析问题和有效地考虑对策。该模型的开发重点是传输线的不平衡因素：模式转换，这发生在界面处的不平衡因素的变化，表示为受控源;模式转换的功率表示为使用模式的特性阻抗和不平衡因素的差异。这表明，不平衡系数可以作为设计参数以及特性阻抗。该模型是多导体传输线理论的扩展，将为处理现有的电气和电子系统提供一种新的理论方案。

As for the issues of common-mode noise in complicated systems, we developed an equivalent model to use for analyzing the issues and consider countermeasures effectively. The model was developed focusing on the imbalance factor of the transmission line: mode conversion, which occurs at the interface where the imbalance factors change, is expressed by controlled sources; the power of mode conversion is expressed using modal characteristic impedance and the difference of the imbalance factors. This suggests that the imbalance factor be available as a design parameter as well as characteristic impedance. The model, which is an expansion of the multi-conductor transmission-line theory, will contribute to develop a new theoretical scheme for treating the present electrical and electronic systems.