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Appl. Sci. 2018, 8(2), 179; https://doi.org/10.3390/app8020179

Frequency Splitting Elimination and Cross-Coupling Rejection of Wireless Power Transfer to Multiple Dynamic Receivers

1
Department of Electrical and Electronics Engineering, SRM University, Chennai 603 203, India
2
Department of Electronics and Instrumentation Engineering, SRM University, Chennai 603 203, India
3
Department of Energy Technology, Aalborg University, 6700 Esbjerg, Denmark
4
Faculty of Engineering, Østfold University College, Kobberslagerstredet 5, 1671 Kråkeroy-Fredrikstad, Norway
*
Author to whom correspondence should be addressed.
Received: 6 December 2017 / Revised: 13 January 2018 / Accepted: 16 January 2018 / Published: 26 January 2018
(This article belongs to the Section Energy)
View Full-Text   |   Download PDF [23041 KB, uploaded 26 January 2018]   |  

Abstract

Simultaneous power transfer to multiple receiver (Rx) system is one of the key advantages of wireless power transfer (WPT) system using magnetic resonance. However, determining the optimal condition to uniformly transfer the power to a selected Rx at high efficiency is the challenging task under the dynamic environment. The cross-coupling and frequency splitting are the dominant issues present in the multiple Rx dynamic WPT system. The existing analysis is performed by considering any one issue present in the system; on the other hand, the cross coupling and frequency splitting issues are interrelated in dynamic Rx’s, which requires a comprehensive design strategy by considering both the problems. This paper proposes an optimal design of multiple Rx WPT system, which can eliminate cross coupling, frequency splitting issues and increase the power transfer efficiency (PTE) of selected Rx. The cross-coupling rejection, uniform power transfer is performed by adding an additional relay coil and independent resonance frequency tuning with capacitive compensation to each Rx unit. The frequency splitting phenomena are eliminated using non-identical transmitter (Tx) and Rx coil structure which can maintain the coupling between the coil under the critical coupling limit. The mathematical analysis of the compensation capacitance calculation and optimal Tx coil size identification is performed for the four Rx WPT system. Finite element analysis and experimental investigation are carried out for the proposed design in static and dynamic conditions. View Full-Text
Keywords: wireless power transfer; frequency splitting; cross-coupling; multiple receivers; magnetic resonance wireless power transfer; frequency splitting; cross-coupling; multiple receivers; magnetic resonance
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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R., N.; Juliet, V.; Padmanaban, S.; Mihet-Popa, L.; C., B. Frequency Splitting Elimination and Cross-Coupling Rejection of Wireless Power Transfer to Multiple Dynamic Receivers. Appl. Sci. 2018, 8, 179.

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