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| Coupling Mechanism Analysis for Multi-Transmitter Switching Wireless Power Transfer System |
| Tan Ping'an1, 2, Liu Chunxia1, Ye Liangwei1, Peng Tao1, Gao Xieping1, 2 |
1. School of Information Engineering Xiangtan University Xiangtan 411105 China;
2. MOE Key Laboratory of Intelligent Computing & Information Processing Xiangtan 411105 China |
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Abstract The coil misalignment problem may reduce the mutual inductance between the coils and also induce the dynamic changes of system optimal load, resulting in a significant decrease in the transmission efficiency of the wireless power transfer (WPT) system. Therefore, this paper presented a multi-transmitter switching coupler to improve the tolerance of lateral misalignment for the WPT system, where in the multi-transmitter is composed of hexagon coils and the receiver is a circular coil. Firstly, the coil structure and working mode of this coupler were analyzed, and the mutual inductance calculation method of the coupler under the condition of axial symmetry and lateral misalignment was constructed. Meanwhile, the evolution law of the coupling coefficient with the lateral misalignment was quantitatively analyzed, and the switching criterion of the transmitting coil was determined. Consequently, the change of coupling coefficient after switching was determined and the dynamic matching conditions of the system optimal load was derived. The experimental results show that the multi-transmitter switching coupler can effectively solve the coil misalignment problem of wireless power transfer system, and can improve the transmission efficiency and stability of the system.
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Received: 01 September 2017
Published: 27 November 2018
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2018, Vol. 33 
