Title :
Analysis and reduction of common mode EMI noise for resonant converters
Author :
Yuchen Yang ; Daocheng Huang ; Lee, Fred C. ; Qiang Li
Author_Institution :
Bradley Dept. of Electr. & Comput. Eng., Center for Power Electron. Syst., Blacksburg, VA, USA
Abstract :
In this paper, the common mode (CM) EMI noise characteristic of three popular topologies of resonant converter (LLC, CLL and LCL) is analyzed. The comparison of their EMI performance is provided. A state-of-art LLC resonant converter with matrix transformer is used as an example to further illustrate the CM noise problem of resonant converters. The CM noise model of LLC resonant converter is provided. A novel method of shielding is provided for matrix transformer to reduce common mode noise. The CM noise of LLC converter has a significantly reduction with shielding. The loss of shielding is analyzed by finite element analysis (FEA) tool. Then the method to reduce the loss of shielding is discussed. There is very little efficiency sacrifice for LLC converter with shielding according to the experiment result.
Keywords :
electromagnetic shielding; finite element analysis; interference suppression; resonant power convertors; transformers; CLL topology; CM EMI noise characteristic; FEA tool; LCL topology; LLC topology; common mode emi noise reduction; finite element analysis; matrix transformer; resonant converters; shielding loss; Capacitance; Electromagnetic interference; Matrix converters; Noise; Topology; Transmission line matrix methods; Windings;
Conference_Titel :
Applied Power Electronics Conference and Exposition (APEC), 2014 Twenty-Ninth Annual IEEE
Conference_Location :
Fort Worth, TX
DOI :
10.1109/APEC.2014.6803365
