Simple Analytical Models to Predict Conducted EMI Noise in a Power Electronic Converter

Knowing the characteristics of the sources and paths involved in the injection of conducted electromagnetic interference (EMI) currents into the input source from a power converter allows one to analyze and improve a converter's electromagnetic compatibility (EMC) performance. In this paper, analytical models to predict the conducted EMI noise generated by a boost power factor correction (PFC) converter are presented. These simple models are based on the noise generation mechanism and the path through which the noise travel. The models require the measurement of high frequency characteristics of the components involved in the noise path. By comparing the predicted noise spectra with the experimentally measured noise spectra, it is verified that the proposed analytical models can be used to reasonably predict the noise generated by the PFC. The proposed models can thus be used to carry out a preliminary design of the EMI filters needed and hence their size and cost even before building and testing the power converter.

[1]  V. Prasad Kodali,et al.  Engineering Electromagnetic Compatibility: Principles, Measurements, and Technologies , 1996 .

[2]  R. Oruganti,et al.  A Metric for Comparing the EMI Spectra of Power Converters , 2006, IECON 2006 - 32nd Annual Conference on IEEE Industrial Electronics.

[3]  F.C. Lee,et al.  Improving the performance of boost PFC EMI filters , 2003, Eighteenth Annual IEEE Applied Power Electronics Conference and Exposition, 2003. APEC '03..

[4]  Christos Christopoulos,et al.  Introduction to Electromagnetic Compatibility , 2007 .

[5]  Kye Yak See,et al.  Measurement of noise source impedance of SMPS using a two probes approach , 2004 .

[6]  Clayton R. Paul,et al.  Diagnosis and reduction of conducted noise emissions , 1988 .

[7]  D. Sable,et al.  Measurement of noise source impedance of off-line converters , 2000 .

[8]  Yie-Tone Chen,et al.  A procedure for designing EMI filters for AC line applications , 1996 .

[9]  Lon M. Schneider.  Noise Source Equivalent Circuit Model for Off-Line Converters and its use in Input Filter Design , 1983, 1983 IEEE International Symposium on Electromagnetic Compatibility.

[10]  F.C. Lee,et al.  Modeling and characterization of a 1 KW CCM PFC converter for conducted EMI prediction , 2004, Nineteenth Annual IEEE Applied Power Electronics Conference and Exposition, 2004. APEC '04..

[11]  Fred C. Lee,et al.  Conducted EMI analysis of a boost PFC circuit , 1997, Proceedings of APEC 97 - Applied Power Electronics Conference.