Theoretical analysis of the efficiency of a V2G wireless charger for Electric Vehicles

Alicia Triviño, Jose M. Gonzalez-Gonzalez, Jose A. Aguado


V2G (Vehicle-to-grid) technology will report important benefits for the operation and safety of the grid. In order to facilitate the expansion of the V2G technology in a future, it is recommended to offer the drivers with easy to use methods to charge and discharge their EV batteries. In this sense, wireless chargers are expected to play a relevant role in the future electrical networks as it reduces the users intervention. The development of this kind of system is still open to improve them in terms of their operation, their compliance and their control. An important issue for the evaluation of these systems is the efficiency, which measures the power losses occurring in the system. This paper addresses a deep study about the losses in a bidirectional wireless charger. Then, it provides with a mathematical model to characterize them. This model is validated by means of experimental results conducted in a 3.7-kW prototype.


V2G; wireless charge; wireless discharge; losses; efficiency; electric vehicle; inductively-coupled power system; ICPT; bidirectional.

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L. Canals Casals, E. Martinez-Laserna, B. Amante Garc´ıa, and N. Nieto,

“Sustainability analysis of the electric vehicle use in Europe for CO2 emissions reduction,” Journal of Cleaner Production, vol. 127, pp. 425–437, 2016.

E. A. Moreira Falc˜ao, A. C. Rodrigues Teixeira, and J. R. Sodr´e, “Analysis of CO2 emissions and techno-economic feasibility of an electric commercial vehicle,” Applied Energy, vol. 193, pp. 297–307, 2017.

A. Trivi˜no, M. Longo, and F. Foiadelli, “Reduction of CO2 emissions using RES to recharge EVs : the Spanish case,” International Conference on Renewable Energies and Power Quality (ICREPQ’17), vol. 1, no. 15, 2017.

K. E. Forrest, B. Tarroja, L. Zhang, B. Shaffer, and S. Samuelsen,

“Charging a renewable future: The impact of electric vehicle charging intelligence on energy storage requirements to meet renewable portfolio standards,” Journal of Power Sources, vol. 336, pp. 63–74, 2016.

M. A. Lopez, S. De La Torre, S. Martin, and J. A. Aguado, “Demandside management in smart grid operation considering electric vehicles load shifting and vehicle-to-grid support,” International Journal of Electrical Power and Energy Systems, vol. 64, pp. 689–698, 2015.

K. M. Tan, V. K. Ramachandaramurthy, and J. Y. Yong, “Integration of electric vehicles in smart grid: A review on vehicle to grid technologies and optimization techniques,” Renewable and Sustainable Energy Reviews, vol. 53, pp. 720–732, 2016.

K. A. Kalwar, M. Aamir, and S. Mekhilef, “Inductively coupled power transfer (ICPT) for electric vehicle charging - A review,” Renewable and Sustainable Energy Reviews, vol. 47, pp. 462–475, 2015.

A. Trivi˜no-Cabrera, J. Aguado, and J. Gonz´alez, “Analytical characterisation of magnetic field generated by ICPT wireless charger,” Electronics Letters, vol. 53, no. 13, pp. 871–873, jun 2017.

G. Di Capua, J. A. A. Sanchez, A. T. Cabrera, D. F. Cabrera, N. Femia, G. Petrone, and G. Spagnuolo, “A losses-based analysis for electric vehicle wireless chargers,” in 2015 International Conference on Synthesis, Modeling, Analysis and Simulation Methods and Applications to Circuit Design (SMACD). IEEE, sep 2015, pp. 1–4.

G. Di Capua, N. Femia, G. Petrone, G. Lisi, D. Du, and R. Subramonian, “Power and efficiency analysis of high-frequency Wireless Power Transfer Systems,” International Journal of Electrical Power & Energy Systems, vol. 84, pp. 124–134, jan 2017.

N. Oswald, P. Anthony, N. McNeill, and B. H. Stark, “An Experimental Investigation of the Tradeoff between Switching Losses and EMI Generation With Hard-Switched All-Si, Si-SiC, and All-SiC Device Combinations,” IEEE Transactions on Power Electronics, vol. 29, no. 5, pp. 2393–2407, may 2014.

R. A. Wood and T. E. Salem, “Evaluation of a 1200-V, 800-A All-SiC Dual Module,” IEEE Transactions on Power Electronics, vol. 26, no. 9, pp. 2504–2511, sep 2011.

A. Trivino, J. M. Gonzalez-Gonzalez, and J. A. Aguado, “Evaluation of losses in a bidirectional wireless power transfer system for electric vehicles,” in 2017 IEEE International Conference on Environment and Electrical Engineering and 2017 IEEE Industrial and Commercial Power Systems Europe (EEEIC / I&CPS Europe). IEEE, jun 2017, pp. 1–5.

Q. Deng, J. Liu, D. Czarkowski, M. K. Kazimierczuk, M. Bojarski, H. Zhou, and W. Hu, “Frequency-Dependent Resistance of Litz- Wire Square Solenoid Coils and Quality Factor Optimization for Wireless Power Transfer,” IEEE Transactions on Industrial Electronics, vol. 63, no. 5, pp. 2825–2837, may 2016. [Online]. Available:

A. Moradi, F. Tahami, and M. A. GhaziMoghadam, “Wireless Power Transfer Using Selected Harmonic Resonance Mode,” IEEE Transactions on Transportation Electrification, vol. 3, no. 2, pp. 508–519, 2017. [Online]. Available:

SAE International, “Wireless Power Transfer for Light-Duty Plug-In/Electric Vehicles and Alignment Methodology (SAE TIR J2954).” [Online]. Available:



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