基于部分电感模型的回路耦合干扰分析

电力电子系统中回路之间的电磁场耦合是电磁干扰主要传播方式之一，为了准确预测系统级的电磁干扰，需要对回路耦合干扰进行定量计算。基于部分单元等效电路(partial element equivalent circuit，PEEC)的部分电感理论，建立了典型电力电子系统回路耦合电磁干扰的模型，主要包括导线之间空间磁场形成的互感耦合和接地回路之间共地阻抗耦合的模型。在实验室中构建了物理对象研究平台，分别对差模电流和共模电流产生的回路耦合干扰进行了测试，实验结果与计算结果对比证明了方法的正确性。

Loop Coupled EMI Analysis Based on Partial Inductance Models

Electromagnetic coupling between two loops inside power electronic systems is main mode for EMI propagation. In order to predict emission level, it is significant to calculate loop coupled EMI. This paper investigates loop coupled EMI issues based on partial inductance model deduced from partial element equivalent circuit (PEEC). The mutual inductance coupling between wires and common ground impedance coupling for grounding loops are modeled respectively. The coupled EMI generated by differential-mode and common-mode current are experimentally studied. The comparison between measured and calculated EMI noise voltage validates proposed analysis and models.