Abstract
This paper proposes a three-coil coupler based wireless power transfer (WPT) system featuring high efficiency and misalignment tolerance. The three-coil coupler consists of a transmitting (Tx) pad and a receiving (Rx) pad. The winding of the Rx pad is a planar circular coil while the winding of the Tx pad is comprised of two anti-series planar circular coils. The reason for high misalignment tolerance is revealed in theory. A parameter optimization method is proposed to obtain the optimal parameters of the three-coil coupler. By introducing the concept of mutual inductance decoupling, the optimal parameters of the three-coil coupler can be rapidly obtained. A WPT prototype was built. The outer radii of the Tx and Rx pads are 210 and 130 mm, respectively. The load-to-source efficiency of the prototype is 90.1% in aligned case where the power transfer distance is 100 mm. It is as high as 85.4% when x-, y-, and z-axis misalignments are 75, 100, and 50 mm, respectively. The output voltages in the abovementioned two cases are 87.3 and 53.0 V, respectively.
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© 2023 The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd.
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Yao, Y., Zhang, C., Ni, Q. (2023). Analysis and Optimization of a Three-Coil Coupler Based WPT System Featuring High Efficiency and Misalignment Tolerance. In: Ma, C., Zhang, Y., Li, S., Zhao, L., Liu, M., Zhang, P. (eds) The Proceedings of 2022 International Conference on Wireless Power Transfer (ICWPT2022). ICWPT 2022. Lecture Notes in Electrical Engineering, vol 1018. Springer, Singapore. https://doi.org/10.1007/978-981-99-0631-4_63
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DOI: https://doi.org/10.1007/978-981-99-0631-4_63
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