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Electrical, Control and Communication Engineering

The Journal of Riga Technical University

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Conducted EMI of Switching Frequency Modulated Boost Converter

Deniss Stepins
Published Online: 2013-09-05 | DOI: https://doi.org/10.2478/ecce-2013-0009


In this paper conducted electromagnetic interference (EMI) of boost converter with switching frequency modulation (SFM) is theoretically analyzed in details. In the analysis line impedance stabilization network parameters, power inductor and input filtering capacitor parameters are taken into account. The analysis shows that the conducted EMI attenuation due to the use of SFM depends not only on modulation index as it is assumed in numerous research papers, but also on central switching frequency. Useful expressions to numerically calculate SFM boost converter conducted EMI spectrum and attenuation due to the use of triangular and sawtooth modulation waveforms are derived. Additionally experimental verification of the theoretical results is performed using a superheterodyne spectrum analyzer. Moreover a procedure for the choice of optimum SFM parameters (modulation waveform, frequency deviation and modulation frequency) to get maximum conducted EMI attenuation is proposed.

Keywords: Electromagnetic interference; switched-mode power supply; frequency modulation

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About the article

Deniss Stepins

Deniss Stepins received the B.Sc., M.Sc. and Dr.Sc.Ing degrees in electronics from Riga Technical University, Riga, Latvia, in 2004, 2006 and 2011 respectively. He is currently a researcher and lecturer in the Department of Radioelectronics, Riga Technical University. He has been involved in several research projects on the examination of spread spectrum technique for switching power converters and improvement of power magnetic components. His research interests include EMI reduction techniques applied to switching power converters, control of switch-mode power converters and planar magnetic components. He is currently an IEEE member. Postal address: Department of Radioelectronics, Riga Technical University, LV-1048, 12 Azenes street, Riga, Latvia.

Published Online: 2013-09-05

Published in Print: 2013-08-01

Citation Information: Electrical, Control and Communication Engineering, Volume 3, Issue 1, Pages 12–18, ISSN (Online) 2255-9159, ISSN (Print) 2255-9140, DOI: https://doi.org/10.2478/ecce-2013-0009.

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