Baikova, {E. N. }, L. Romba, {S. S. } Valtchev, R. Melicio, V. {Fernão Pires}, A. Krusteva, and G. Gigov,
"Electromagnetic field generated by a wireless energy transfer system: comparison of simulation to measurement",
Journal of Electromagnetic Waves and Applications, vol. 32, no. 5: Taylor & Francis, pp. 554–571, 3, 2018.
AbstractThis paper presents a wireless energy transfer system operating at the frequency values of kHz order: modeling, simulation, and comparison with prototype measurement results. Wireless energy transfer system model using finite element method was carried out to simulate the electric field and the magnetic flux density for different air gap sizes between the transmitter and the receiver coils. Results are presented and compared with the electromagnetic emission measurements radiated by the wireless energy transfer system prototype. The electric field comparison between the simulated and the prototype measurement values shows an error of roughly 8.7{%}. In the recent years, the interest in the wireless energy transfer technology, especially for electric vehicles batteries charging, is rapidly increasing. As a result of the increasing application of this technology in the industrial and consumer electronic products, more concerns are raised about the electromagnetic compatibility, since the wireless energy transfer systems produce electromagnetic emissions in the surrounding environment.
Vasilev, V., V. Batchev, M. Milev, S. Valtchev, and A. Tatzov,
"An Electronic System for Rowers' Propulsion Motion Activities Studies",
Problems of the Physical Culture and Sport (now: "Sport and Science Magazine"), no. 2, pp. 13–17, February, 1986.
Valtchev, S., B. Borges, K. Brandisky, and B. J. Klaassens,
"Resonant Contactless Energy Transfer With Improved Efficiency",
IEEE Transactions on Power Electronics, vol. 24, no. 3: IEEE, pp. 685–699, 2009.
AbstractThis paper describes the theoretical and experimental results achieved in optimizing the application of the series loaded series resonant converter for contactless energy transfer. The main goal of this work is to define the power stage operation mode that guarantees the highest possible efficiency. The results suggest a method to select the physical parameters (operation frequency, characteristic impedance, transformer ratio, etc.) to achieve that efficiency improvement. The research clarifies also the effects of the physical separation between both halves of the ferromagnetic core on the characteristics of the transformer. It is shown that for practical values of the separation distance, the leakage inductance, being part of the resonant inductor, remains almost unchanged. Nevertheless, the current distribution between the primary and the secondary windings changes significantly due to the large variation of the magnetizing inductance. An approximation in the circuit analysis permits to obtain more rapidly the changing values of the converter parameters. The analysis results in a set of equations which solutions are presented graphically. The graphics show a shift of the best efficiency operation zone, compared to the converter with an ideally coupled transformer. Experimental results are presented confirming that expected tendency.
Valtchev, S., B. Borges, K. Brandisky, and J. B. Klaassens,
"Resonant contactless energy transfer with improved efficiency",
IEEE Transactions on Power Electronics, vol. 24, no. 3, pp. 685-699, 2009.
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Baikova, E. N., S. S. Valtchev, R. Melicio, A. Krusteva, and V. Fernão Pires,
"Study of the electromagnetic interference generated by wireless power transfer systems",
International Review of Electrical Engineering, vol. 11, no. 5, pp. 526-534, 2016.
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