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Wireless power transfer (WPT) system for an electric vehicle (EV): how to shield the car from the magnetic field generated by two planar coils

Published online by Cambridge University Press:  27 November 2017

Tommaso Campi ,
Silvano Cruciani ,
Valerio De Santis ,
Francesca Maradei  and
Mauro Feliziani
Tommaso Campi*
Affiliation:
Department of Industrial and Information Engineering and Economics, University of L'Aquila, L'Aquila, Italy
Silvano Cruciani
Affiliation:
Department of Industrial and Information Engineering and Economics, University of L'Aquila, L'Aquila, Italy
Valerio De Santis
Affiliation:
Department of Industrial and Information Engineering and Economics, University of L'Aquila, L'Aquila, Italy
Francesca Maradei
Affiliation:
Department of Astronautics, Electrical and Energetic Engineering, Sapienza University of Roma, Roma, Italy
Mauro Feliziani
Affiliation:
Department of Industrial and Information Engineering and Economics, University of L'Aquila, L'Aquila, Italy
*
Corresponding author: T. Campi Email: tommaso.campi8888@gmail.com
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Abstract

This paper deals with the shielding of the magnetic field generated by two planar coils of a wireless power transfer (WPT) system at the frequency of tens of kilohertz used in automotive applications. Different shielding techniques using conductive and magnetic materials are examined and discussed highlighting strong and weak points of each other. Finally, the proposed shielding configuration consisting of a combined conductive and magnetic material is applied to model an electric vehicle equipped with a WPT charging system. With this configuration, compliance with the electromagnetic field safety standards can be achieved inside (passengers) or near (pedestrian) the car.

Keywords

Wireless power transferelectric vehicle (EV)magnetic fieldinductive coupling
Type
Research Article
Information
Wireless Power Transfer , Volume 5 , Issue 1 , March 2018 , pp. 1 - 8
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Copyright
Copyright © Cambridge University Press 2017 

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References

REFERENCES

[1] Cruciani, S.; Feliziani, M.: Mitigation of the magnetic field generated by a wireless power transfer (WPT) system without reducing the WPT efficiency, in EMC Europe –Int. Symp. on EMC, Bruges, Belgium, Sept. 2–6, 2013, 610-615.Google Scholar
[2] Campi, T.; Cruciani, S.; Feliziani, M.: Magnetic shielding of wireless power transfer systems, EMC'14, /Tokyo, in 2014 Int. Symp. Electromagnetic Compatibility, Tokyo, Japan, 2014, 422–425.Google Scholar
[3] Fisher, T.M.; Farley, K.B.; Gao, Y.; Bai, H.; Tse, Z.T.H.: Electric vehicle wireless charging technology: a state-of-the-art review of magnetic coupling systems. Wireless Power Transf., 1 (2) (2014), 87–96.Google Scholar
[4] Campi, T.; Cruciani, S.; De Santis, V.; Maradei, F.; Feliziani, M.: Numerical characterization of the magnetic field in electric vehicles equipped with a WPT system. Wireless Power Transf., (2017), 1–10. Online. Available: https://doi.org/10.1017/wpt.2017.5 Google Scholar
[5] Campi, T.; Cruciani, S.; De Santis, V.; Feliziani, M.: EMF safety and thermal aspects in a pacemaker equipped with a wireless power transfer system working at low frequency. IEEE Trans. Microw. Theory Techn., 64 (2) (2016), 375–382.Google Scholar
[6] Campi, T.; Cruciani, S.; De Santis, V.; Palandrani, F.; Hirata, A.; Feliziani, M.: Wireless power transfer charging system for AIMDs and pacemakers. IEEE Trans. Microw. Theory Techn., 64 (2) (2016), 633–642.Google Scholar
[7] Asakura, S.; Kikuma, N.; Hiyayama, H.; Sakakibara, K.: Shielding effect of magnetic resonant wireless power transfer, in 2011 IEICE General Conf., Mar. 2011, B 4-69.Google Scholar
[8] Kim, J. et al. ; Coil design and shielding methods for a magnetic resonant wireless power transfer system. Proc. IEEE, 101 (6) (2013), 1332–1341.Google Scholar
[9] Wang, C.-S.; Covic, G.A.; Stielau, O.H.: Power transfer capability and bifurcation phenomena of loosely coupled inductive power transfer systems. IEEE Trans. Ind. Electron., 51 (1) (2004), 148–157.Google Scholar
[10] Huh, J.; Lee, S.W.; Lee, W.Y.; Cho, G.H.; Rim, C.T.: Narrow-width inductive power transfer system for online electrical vehicles. IEEE Trans. Power Electron., 26 (12) (2011), 3666–3679.CrossRefGoogle Scholar
[11] Budhia, M.; Covic, G.A.; Boys, J.T.: Design and optimization of circular magnetic structures for lumped inductive power transfer systems. IEEE Trans. Power Electron., 26 (11) (2011), 3096–3108.Google Scholar
[12] Campi, T.; Cruciani, S.; Maradei, F.; Feliziani, M.: Magnetic shielding design of wireless power transfer systems, in Proc. of 2015 IEEE Applied Computational Electromagnetics (ACES), Williamsburg, VA, USA, March 22–26, 2015, 1–2.Google Scholar
[13] Choi, S.Y.; Gu, B.W.; Lee, S.W.; Lee, W.Y.; Huh, J.; Rim, C.T.: Generalized active EMF cancel methods for wireless electric vehicles. IEEE Trans. Power Electron., 29 (11) (2014), 5770–5783.Google Scholar
[14] ICNIRP Guidelines: Guidelines for limiting exposure to time-varying electric and magnetic fields (1 Hz - 100 kHz). Health Phys. 99 (6) (2010), 818–836.Google Scholar
[15] IEC 61980-1: Electric vehicle wireless power transfer (WPT) systems – Part 1: General requirements, 2015.Google Scholar
[16] Chan, C.C.; Jian, L.; Tu, D.: Smart charging of electric vehicles – integration of energy and information. IET Electrical Syst. Transportation, 4 (4) (2014), 89–96.CrossRefGoogle Scholar
[17] SAE TIR J2954: Wireless power transfer for light-duty plug-in/electric vehicles and alignment methodology.Google Scholar
[18] Buccella, C.; Feliziani, M.; Fuina, V.; ELF magnetic field mitigation by active shielding. IEEE Int. Symp. Ind. Electron., 3, (2002), 994–998.Google Scholar
[19] Caruso, C.; Feliziani, M.; Maradei, F.: ELF magnetic field produced by the ac electrification in a railway carriage, in Stavroulakis, P. (Ed.), Biological Effects of Electromagnetic Fields, Springer Verlag, Berlin, Germany, 2003, 994–998.Google Scholar
[20] Schulz, R.B.; Plantz, V.C.; Brush, D.R.: Shielding theory and practice. IEEE Trans. Electromagn. Compat., 30 (3) (1988), 187–201.Google Scholar
[21] Campi, T.; Cruciani, S.; Maradei, F.; Feliziani, M.: Near-field reduction in a wireless power transfer system using LCC compensation. IEEE Trans. Electromag. Compat., 59 (2), 2017, 686–694.Google Scholar
[22] Feliziani, M. et al. ; Robust LCC compensation in wireless power transfer with variable coupling factor due to coil misalignment, in Proc. of 2015 IEEE 15th Int. Conf. on Environment and Electrical Engineering (EEEIC), Rome, Italy, June 10–13, 2015, 1181–1186.Google Scholar
[23] Campi, T.; Cruciani, S.; Maradei, F.; Feliziani, M.: Conducted emission of wireless power transfer charging system in electric vehicle, in 2017 IEEE International Symposium on Electromagnetic Compatibility & Signal/Power Integrity (EMCSI), Aug. 7–11, Washington DC, USA, 2017, 619–622.Google Scholar