基于环形LC单元的新型连接方式及其在平面EMI滤波器中的应用

LC单元是指"感容"集成的模块,是组成EMI滤波器的重要元件之一。理想情况下,LC单元由双面螺旋线构成。基于环形LC单元的不同连接方式,提出了一种新型结构———完成共模电感和差模电容的集成。本文建立了LC单元的等效模型,并在此基础上分析了该结构在差、共模电流作用下的参数模型。实验和理论研究表明,所提出的模块能有效增大共模电感值。

New Connection Based on LC Unit for Its Application in Planar EMI Filter

The LC unit is an important component of the EMI filter for its easy "inductance-inductance" integration, and usually the ideal LC unit is composed of the double helix structure. Based on the different ways of connection on LC units, a new structure is presented, which is mainly used for the integration of common-mode inductors and differential-mode capacitor. According to the transmission line theory, the equivalent model of LC units is established, and then the parameter models of the new structure are analyzed under the conditions of the differential-mode current and the common-mode current. Moreover, the research shows that the proposed model has larger common-mode inductor, which is also confirmed by the corresponding experiment.