充電電界が均一なため、利用者に最適な新型送信機です。 A uniform charging field makes this new transmitter ideal for consumer devices.
2022-03-04 フィンランド・アールト大学
A new wireless charging technology opens the door to developing charging stations for consumer use.
Photo: Aalto University
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New power transfer technology provides unprecedented freedom for wireless charging
2次元無指向性無線電力伝送用円筒形送信コイル Cylindrical Transmitting Coil for Two-Dimensional Omnidirectional Wireless Power Transfer
Nam Van Ha; Yining Liu; Prasad Kumara Sampath Jayathurathnage; Constantin Simovski; Sergei Tretyakov
Abstract:
Megahertz-range wireless power transfer has become a promising approach for increasing spatial freedom of charging. This paper proposes a cylindrical-shaped coil, which can produce the homogeneous magnetic field in a plane. The coil consists of two helical windings, which are wound to guide the current in opposite directions. A single power source is used to excite the transmitter without any current amplitude or phase control circuits. Furthermore, since the parasitic capacitance of the coil is not negligible due to the complexity of the coil shape, we develop a general equivalent model with parasitic capacitance for the analysis of complex coils. The system efficiency of the proposed omnidirectional wireless power transfer device is validated by a practical experiment. The measured DC-to-DC efficiency of approximately 72.4% and the load power of 13 W are demonstrated for the proposed wireless charging system at 6.78 MHz operating frequency. Finally, we verify that the electromagnetic exposure satisfies the safety regulations.
Published in: IEEE Transactions on Industrial Electronics ( Early Access )
Page(s): 1 – 1
Date of Publication: 23 February 2022
ISSN Information:
DOI: 10.1109/TIE.2022.3151961
Publisher: IEEE
