Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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Modeling and Filter Design through Analysis of Conducted EMI in Switching Power Converters

  • Vimala, R. (Dept. of EEE, PSNA College of Engineering and Technology) ;
  • Baskaran, K. (Dept. of CSE, Govt. College of Technology (GCT)) ;
  • Aravind Britto, K.R. (Dept. of ECE, RVS College of Engineering and Technology)
  • Received : 2011.03.30
  • Published : 2012.07.20
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Abstract

This paper presents a filter analysis of conducted Electro-Magnetic Interference (EMI) in switching power converters (SPC) based on noise impedances. The EMI characteristics of SPC can be analytically deduced from a circuit theoretical viewpoint. The analytical noise model is investigated to get a full understanding of the EMI mechanism. It is shown that with suitable and justified model, filters pertinent to EMI noise is investigated. The EMI noise is identified by time domain measurements associated with an isolated half-bridge ac-dc converter. Practical filters like LC filter, ${\pi}$ filter and complete EMI filters are investigated. The proposed analysis and results can provide a guideline for improving the effectiveness of filtering schemes in SPC. Experimental results are also included to verify the validity of the proposed method. The results obtained satisfy the Federal Communications Commission (FCC) class A and class B regulations.

Keywords

References

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