Uniform magnetic field by changing the current distribution on the planar coil for displacement-insensitive wireless power transfer/near field communication
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- 作者：Laiwei Shen ; Wanchun Tang ; Huiling Xiang and Wei Zhuang
- 关键词：wireless power transfer ; uniform magnetic field distribution ; transmitting coil
- 刊名：Microwave and Optical Technology Letters
- 出版年：2015
- 出版时间：February 2015
- 年：2015
- 卷：57
- 期：2
- 页码：424-427
- 全文大小：488K
- ISSN：1098-2760
文摘
In either inductive or strongly coupled magnetic resonance type wireless power transfer, the uniformity of magnetic field distribution near the transmitting coil is urgent needed as it would affect the stability of transfer efficiency when the receiving coil is moving. In this article, we proposed a new coil structure to achieve uniform magnetic field based on the relationship between the magnetic field distribution and current distribution of a coil structure. The coil is constructed of three or more spiral coils in series, where each spiral coil has a different current through a novel winding structure. The design procedure is presented, and the improved performance is verified by experiment. Compared with previous literatures, this proposed coil can generate a better uniform magnetic field distribution.