电力电子装置中无源元件间耦合效应的研究

电力电子装置传导电磁干扰(EMI)的传播通道建模是电力电子装置电磁兼容性(EMC)的分析、调试及预测中的关键问题之一。为了提高传导EMI传播通道高频模型的准确性，必须考虑元件自身的杂散参数，还需要适当计及无源元件间的耦合效应。本文详细分析了两个无源元件间存在的三种耦合效应及其对传导EMI传播通道特性的影响，通过实验测取了各种耦合效应与元件间距离的关系。在此基础上，提出了描述两个无源元件间耦合效应的二端口电路模型，并应用于一个二阶低通LC滤波器频率特性的仿真研究。结果表明，采用该二端口模型可以大幅提高传导EMI传播通道模型的准确性，从而证明了考虑耦合效应的必要性。

Coupling Effects among Passive Components Used in Power Electronic Devices

Modeling the coupling path of conducted electromagnetic interference (EMI) in power electronic devices is one of effective ways to analyze, debug and predict their electromagnetic compatibility (EMC). To obtain more accurate model of EMI coupling path, the coupling effects among passive components should be involved in the model besides their inherent parasitical parameters. In this paper, three kinds of coupling effects between two passive components are investigated in detail. Based on the experiment results of the relationship between each kind of coupling effect and the distance between the two passive components, a two-port model is proposed to describe performance of two passive components including their coupling effects. Simulated and experiment results of frequency characteristics of a two-stage low-pass LC filter show that the model including coupling effects is a way to effectively analyze the coupling path characteristics of conducted EMI.