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http://dx.doi.org/10.6113/TKPE.2020.25.3.181

Spherical Flux Concentration Transmitter for Omnidirectional Wireless Power Transfer with Improved Power Transmission Distance  

Park, Kwang-Rock (Dept. of Electrical Engineering, HYPEC-EPECS Lab., Hanyang University)
Cha, Hwa-Rang (Dept. of Electrical Engineering, HYPEC-EPECS Lab., Hanyang University)
Kim, Rae-Young (Dept. of Electrical Bio-Engineering, Hangyang University)
Kim, Tae-Jin (Power Conversion & System for Renewable Energy Research Center, KERI)
Publication Information
The Transactions of the Korean Institute of Power Electronics / v.25, no.3, 2020 , pp. 181-187 More about this Journal
Abstract
In this study, we propose a spherical flux concentration structure for omnidirectional wireless power transfer. Omnidirectional wireless power transfer technology is a method that can transmit power to a transmitter located in an arbitrary position in a two-dimensional or three-dimensional space. However, to improve the power transfer distance in a wireless power transfer system, the diameter of the coil or the number of windings must increase, thereby increasing the size of the transmitter. The proposed transmitter structure adds a ferrite core inside the transmitter coil so that the magnetic flux generated by the transmitter is directed toward the position of the receiver. As a result, the flux linkage and the mutual inductance increase. By implementing the omnidirectional wireless power transfer system using the proposed structure, the power transfer distance can be improved by 65% compared with the conventional system without increasing the size of the transmitter. Simulation shows that the proposed spherical flux concentration structure increases the mutual inductance of the omnidirectional wireless power transmission system.
Keywords
Wireless power transfer system; Omnidirectional wireless power transfer; Transmitter coil structure;
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