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An improved partially overlapped transmitting array for enhancement of wireless power transmission efficiency
Author(s) -
Liu Zhiwei,
Hu Cheng,
Hu Pengfei,
Zhang Xiaoyan,
Yu Yiqiang
Publication year - 2019
Publication title -
international journal of rf and microwave computer‐aided engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.335
H-Index - 39
eISSN - 1099-047X
pISSN - 1096-4290
DOI - 10.1002/mmce.21883
Subject(s) - wireless power transfer , electromagnetic coil , miniaturization , power transmission , transmission (telecommunications) , electronic engineering , power (physics) , spiral (railway) , wireless , electrical engineering , electrical efficiency , acoustics , engineering , computer science , physics , telecommunications , mechanical engineering , quantum mechanics
In the conventional transmitting coil array for wireless power transmission (WPT), magnetic fields generated through the gaps between coil elements often reduce the overall magnetic fluxes and therefore the power transfer efficiency due to their directions. To overcome the problem, an overlapping of coil elements is applied to develop a WPT coil array system. In this article, the printed spiral coil is used as the resonance unit with low profile, miniaturization, easy to manufacture, and high integration. The overlapping 2 × 2 coil array is able to generate an enhanced magnetic field without dead points. In comparisons with the conventional system, the presented transmitting system provides a larger and more uniform magnetic field distribution with higher wireless power transmission efficiency. Both the simulation and measured efficiency are 70%‐78% at nine different observation points. Both simulation and measurement results demonstrate the effectiveness and efficiency as well as feasibility of the proposed system.