Mobile QR Code QR CODE : The Korean Institute of Power Electronics
Title Spherical Flux Concentration Transmitter for Omnidirectional Wireless Power Transfer with Improved Power Transmission Distance
Authors Kwang-Rock Park ; Hwa-Rang Cha ; Rae-Young Kim ; Tae-Jin Kim
DOI 10.6113/TKPE.2020.25.3.181
Page pp.181-187
ISSN 1229-2214
Keywords Wireless power transfer system; Omnidirectional wireless power transfer; Transmitter coil structure
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.