Magnetic Analysis of Copper Coil Power Pad with Ferrite Core for Wireless Charging Application

  • Aqueel AhmadEmail author
  • Mohammad Saad Alam
Regular Paper


Wireless charging can automate the charging of electrical devices, very quickly connected with IoT based smart systems. The efficiency of wireless charging collectively depends on the design of the power pad, the frequency level of power transfer, the distance between the transmitter and receiver, alignment between the coils. Coils design comprehend the shape of the coil, material of the coil used, the thickness of the wire used and core shape and material used in the core. The manuscript compares the power pad coil shapes, with the introduction of ferrite material core across the coils to design an extremely efficient power pad for the wireless charging of electric vehicle. A 3D finite element method was used for analysis, due to the unconventional distribution of the flux. Only three types of coils, D, DD, and DDQ, are taken for analysis of magnetic core introduction. The comparison is made based on simulation results, magnetic flux pattern as well as data imported from the results. Ansys 3D Maxwell simulation software is used to simulate the magnetic pattern of the power pad coils. Finally, the results show the DD type coil shows the best magnetic fields and the maximum coupling coefficient with the maximum misalignment tolerance and the ferrite core across the coils have aligned the magnetic flux pattern and slightly improved the coupling coefficient.


Electromagnetic field Ferrite core Wireless power transfer Power pad 


  1. 1.
    A. Ahmad, M.S. Alam, R. Chabaan, A comprehensive review of wireless charging technologies for electric vehicles. IEEE Trans. Transp. Electrif. 4(1), 38–63 (2018)CrossRefGoogle Scholar
  2. 2.
    H.K. Dashora, G. Buja, M. Bertoluzzo, R. Pinto, V. Lopresto, Analysis and design of DD coupler for dynamic wireless charging of electric vehicles. J. Electromagn. Waves Appl. 5071, 1–20 (2017)Google Scholar
  3. 3.
    L. Zhao, D.J. Thrimawithana, U.K. Madawala, Hybrid bidirectional wireless EV charging system tolerant to pad misalignment. IEEE Trans. Ind. Electron. 64(9), 7079–7086 (2017)CrossRefGoogle Scholar
  4. 4.
    V. Jiwariyavej, T. Imura, Y. Hori, Coupling coefficients estimation of wireless power transfer system via magnetic resonance coupling using information from either side of the system. IEEE J Emerg Sel Top Power Electron 3(1), 191–200 (2015)CrossRefGoogle Scholar
  5. 5.
    Y. Zheng, Z.Y. Dong, Y. Xu, K. Meng, J.H. Zhao, J. Qiu, Electric vehicle battery charging/swap stations in distribution systems: comparison study and optimal planning. IEEE Trans. Power Syst. 29(1), 221–229 (2014)CrossRefGoogle Scholar
  6. 6.
    W. Eberle, F. Musavi, Overview of wireless power transfer technologies for electric vehicle battery charging. IET Power Electron. 7(1), 60–66 (2014)CrossRefGoogle Scholar
  7. 7.
    Z. Huang, S.-C. Wong, C.K. Tse, Design of a single-stage inductive-power-transfer converter for efficient EV battery charging. IEEE Trans. Veh. Technol. 66(7), 5808–5821 (2017)CrossRefGoogle Scholar
  8. 8.
    Y. Hori, Novel EV society based on motor/capacitor/wireless; application of electric motor, supercapacitors, and wireless power transfer to enhance operation of future vehicles, in 2012 IEEE MTT-S International Microwave Workshop Series on Innovative Wireless Power Transmission: Technologies, Systems, and Applications (2012), pp. 3–8Google Scholar
  9. 9.
    J.M. Miller, C.P. White, O.C. Onar, P.M. Ryan, Grid side regulation of wireless power charging of plug-in electric vehicles. IEEE Energy Convers. Congr. Expo. (ECCE) 2012, 261–268 (2012)Google Scholar
  10. 10.
    S. Campbell et al., Oak ridge national laboratory wireless charging of electric vehicles—CRADA report (2016)Google Scholar
  11. 11.
    J.M. Miller, O.C. Onar, M. Chinthavali, Primary-side power flow control of wireless power transfer for electric vehicle charging. IEEE J. Emerg. Sel. Top. Power Electron. 3(1), 147–162 (2015)CrossRefGoogle Scholar
  12. 12.
    S. Das Barman, A.W. Reza, N. Kumar, M.E. Karim, A.B. Munir, Wireless powering by magnetic resonant coupling: recent trends in wireless power transfer system and its applications. Renew. Sustain. Energy Rev. 51, 1525–1552 (2015)CrossRefGoogle Scholar
  13. 13.
    A. Namadmalan, J.S. Moghani, New resonant inverter tuning for three-phase current source parallel resonant inverters. Acta Polytech. Hung. 11(5), 217–234 (2014)Google Scholar
  14. 14.
    H. Sugiyama, in Performance Analysis of Magnetic Resonant System Based on Electrical Circuit Theory, ed. by K.Y. Kim. Wireless Power Transfer, (IntechOpen, 2012).
  15. 15.
    A. Ahmad, M.S. Alam, R.C. Chaban, Efficiency enhancement of wireless charging for electric vehicles through reduction of coil misalignment, in 2017 IEEE Transportation Electrification Conference and Expo (ITEC) (2017), pp. 21–26Google Scholar
  16. 16.
    A. Ahmad, M.S. Alam, Y. Varshney, R.H. Khan, A state of the art review on wireless power transfer a step towards sustainable mobility, in Indicon 2017 (2017)Google Scholar
  17. 17.
    A. Ahmad, Z.A. Khan, M. Saad Alam, S. Khateeb, A review of the electric vehicle charging techniques, standards, progression and evolution of EV technologies in Germany. Smart Sci. 6(1), 36–53 (2018)CrossRefGoogle Scholar
  18. 18.
    J.P.W. Chow, N. Chen, H.S.H. Chung, L.L.H. Chan, An investigation into the use of orthogonal winding in loosely coupled link for improving power transfer efficiency under coil misalignment. IEEE Trans. Power Electron. 30(10), 5632–5649 (2015)CrossRefGoogle Scholar
  19. 19.
    M.S. Alam, A. Ahmad, Road to (R2 V) electric, plug-in hybrid electric vehicles (XEVS) wireless charging misalignment reduction by multi-coil receiver system, 201711019367 A (2017)Google Scholar
  20. 20.
    M. Mohammad, S. Choi, M.Z. Islam, S. Kwak, J. Baek, Core design and optimization for better misalignment tolerance and higher range wireless charging of PHEV. IEEE Trans. Transp. Electrif. 7782(c), 1 (2017)Google Scholar
  21. 21.
    K. Aditya, V.K. Sood, L. Fellow, S.S. Williamson, S. Member, Magnetic characterization of unsymmetrical coil pairs using archimedean spirals for wider misalignment tolerance in IPT systems. IEEE Trans. Transp. Electrif. 3(2), 454–463 (2017)CrossRefGoogle Scholar
  22. 22.
    H. Moon, S. Kim, H.H. Park, S. Ahn, Design of a resonant reactive shield with double coils and a phase shifter for wireless charging of electric vehicles. IEEE Trans. Magn. 51(3), 18–21 (2015)Google Scholar
  23. 23.
    A. Zaheer, H. Hao, G.A. Covic, D. Kacprzak, Investigation of multiple decoupled coil primary pad topologies in lumped IPT systems for interoperable electric vehicle charging. IEEE Trans. Power Electron. 30(4), 1937–1955 (2015)CrossRefGoogle Scholar
  24. 24.
    M. Budhia, G.A. Covic, J.T. Boys, Design and optimisation of magnetic structures for lumped inductive power transfer systems, in 2009 IEEE Energy Conversion Congress and Exposition (2009), pp. 2081–2088Google Scholar
  25. 25.
    M. Budhia, G.A. Covic, J.T. Boys, Design and optimization of circular magnetic structures for lumped inductive power transfer systems. IEEE Trans. Power Electron. 26(11), 3096–3108 (2011)CrossRefGoogle Scholar
  26. 26.
    M. Budhia, G. Covic, J. Boys, A new IPT magnetic coupler for electric vehicle charging systems, in IECON Proceedings (Industrial Electronics Conference) (2010), pp. 2487–2492Google Scholar
  27. 27.
    M. Budhia, J.T. Boys, G.A. Covic, C.Y. Huang, Development of a single-sided flux magnetic coupler for electric vehicle IPT charging systems. IEEE Trans. Ind. Electron. 60(1), 318–328 (2013)CrossRefGoogle Scholar
  28. 28.
    M.S. Alam, A. Ahmad, Z.A. Khan, Y. Rafat, R.C. Chabaan, I. Khan, S.M. Al-Shariff, A bibliographical review of electrical vehicles (xEVs) standards. SAE Int. J. Alter. Powertrains. (2018). Google Scholar
  29. 29.
    F. Ahmad, M.S. Alam, M. Asaad, Developments in xEVs charging infrastructure and energy management system for smart microgrids including xEVs. Sustain. Cities Soc. 35, 552–564 (2017)CrossRefGoogle Scholar

Copyright information

© The Korean Institute of Electrical and Electronic Material Engineers 2018

Authors and Affiliations

  1. 1.Department of Electrical Engineering, Zakir Husain College of Engineering and TechnologyAligarh Muslim UniversityAligarhIndia

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