Mohammed LAOUR, Redouane TAHMI, Christian VOLLAIRE

Experimental evaluation and FDTD method for predicting electromagnetic elds in the near zone radiated by power converter systems

This paper presents the study of conducted electromagnetic interference (EMI) currents owing through the power cables of a DC-DC converter system and its correlation with the near eld radiated from these cables. The radiated emission measurement contains a common mode (CM) and a differential mode (DM), and accurate separation of the radiated emissions of these two modes is necessary. The nite-difference time-domain (FDTD) method is used to predict the electromagnetic radiation caused by CM currents and DM currents. An experimental bench has been designed to allow access to the measurement of EMI disturbances at various sensitive places. The CM and DM voltages resulting from the experimental measurement are implemented in the FDTD algorithm as voltage sources of disturbances, these disturbance voltages causing the generation of CM and DM currents owing through the cable. Finally, single and bi lar wire models for modeling the near eld using the FDTD method are presented and the simulation results of the neareld caused by both of the modes are evaluated and compared with the experimental ones. The main objective is to investigate the signi cance of the contribution of each of the current modes on the radiated emissions from the cable using the FDTD method, thus characterizing the level of cable radiation versus a speci c standard. This allows showing that the radiation is often caused by the CM current along the cable and the largest level is located in the switching noise zone located within the frequency range from 1 MHz to 10 MHz.

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[1] Paul CR. Introduction to Electromagnetic Compatibility. 2nd ed. New York, NY, USA: Wiley, 2006.
[2] Paul CR. A comparison of the contributions of common-mode and differential-mode currents in radiated emissions. IEEE T Electromagn C 1989; 31: 189-193.
[3] Chen H, Qian Z. Modeling and characterization of parasitic inductive coupling effects on differential-mode EMI performance of a boost converter. IEEE T Electromagn C 2011; 53: 1072-1080.
[4] Kaires RG. The correlation between common mode currents and radiated emissions. In: IEEE 2000 International Symposium on Electromagnetic Compatibility; 21{25 August 2000; Washington, DC, USA. New York, NY, USA: IEEE. pp. 141-146.
[5] Meng J, Ma W, Zhang L. Determination of noise source and impedance for conducted EMI prediction of power converters by lumped circuit models. In: IEEE 2004 Power Electronics Specialists Conference; 20{25 June 2004; Aachen, Germany. New York, NY, USA: IEEE. pp. 3028-3033.
[6] Bishnoi H, Baisden AC, Mattavelli P, Boroyevich D. Analysis of EMI terminal modeling of switched power convert- ers. IEEE T Power Electr 2012; 27: 3924-3933.
[7] Stahl J, Kuebrich D, Duerbaum T. Characterisation of an effective EMI noise separation including a standard LISN. In: IEEE 2010 International Symposium on Electromagnetic Theory; 16{19 August 2010; Berlin, Germany. New York, NY, USA: IEEE. pp. 13-16.
[8] Caponet MC, Profumo F. Devices for the separation of the common and differential mode noise: design and realization. In: IEEE 2002 Applied Power Electronics Conference and Exposition; 10{14 March 2002; Dallas, TX, USA. New York, NY, USA: IEEE. pp. 100-105.
[9] Cakr G, Cakr M, Sevgi L. Electromagnetic radiation from multilayer printed circuit boards: a 3D FDTD-based virtual emission predictor. Turk J Elec Eng & Comp Sci 2009; 17: 315-328.
[10] Rondon E, Morel F, Vollaire C, Schanen JL. Modeling of a buck converter with a SiC JFET to predict EMC conducted emissions. IEEE T Power Electr 2014; 29: 2246-2260.
[11] Baba Y, Nagaoka N, Ametani A. Modeling of thin wires in a lossy medium for FDTD simulations. IEEE T Electromagn C 2005; 47: 54-61.
[12] Makinen RM, Juntunen JS, Kivikoski MA. An improved thin-wire model for FDTD. IEEE T Microw Theory 2002; 50: 1245-1255.
[13] Piket-May M, Ta ove A, Baron J. FDTD modeling of digital signal propagation in 3-D circuits with passive and active lumped loads. IEEE T Microw Theory 1994; 42: 1514-1523.
[14] Chu, QX, Hu XJ, Chan KT. Models of small microwave devices in FDTD simulation. IEICE T Electron 2003; E86: 120-125.
[15] Ta ove A, Hagness S. Computational Electrodynamics: The Finite-difference Time-domain Method. 3rd ed. Boston, MA, USA: Artech House, 2005.
[16] Ta ove A, Brodwin ME. Numerical solution of steady-state electromagnetic scattering problems using the time- dependent Maxwell's equations. IEEE T Microw Theory 1975; 23: 623-630.
[17] Yee KS. Numerical solution of initial boundary value problems involving Maxwell's equations in isotropic media. IEEE T Antenn Propag 1969; 14: 302-307.
[18] Berenger JP. A perfectly matched layer for the absorption of electromagnetic waves. J Comput Phys 1994; 114: 185-200.
[19] Berenger JP. A multiwire formalism for the FDTD method. IEEE T Electromagn C 2000; 42: 257-264.
[20] Ala G, Di Piazza MC, Tine G, Viola F, Vitale G. Evaluation of radiated EMI in 42-V vehicle electrical systems by FDTD simulation. IEEE T Veh Technol 2007; 56: 1477-1484.
[21] International Electrotechnical Commission. Speci cation for Radio Disturbance and Immunity Measuring Apparatus and Methods - Part 2-1: Methods of Measurement of Disturbances and Immunity - Conducted Disturbance Measurements. CISPR 16-2-1; Rev. 1.1. Geneva, Switzerland: IEC, 2005.
[22] RTCA Inc. Environmental Conditions and Test Procedures for Airborne Equipment. RTCA/DO-l60F. Washington, DC, USA: RTCA Inc., 2007.
[23] Costa F, Gautier C, Revol B, Genoulaz J, Demoulin B. Modeling of the near- eld electromagnetic radiation of power cables in automotives or aeronautics. IEEE T Power Electr 2013; 28: 4580-4593.
[24] Majid A, Saleem J, Bertilsson K. EMI lter design for high frequency power converters. In: IEEE 2012 International Conference on Environment and Electrical Engineering; 18{25 May 2012; Venice, Italy. New York, NY, USA: IEEE. pp. 586-589.