Three-coil Magnetically Coupled Resonant Wireless Power Transfer System with Adjustable-position Intermediate Coil for Stable Transmission Characteristics

Xuling Chen; Lu Chen; Weiwei Ye; Weipeng Zhang

Three-coil Magnetically Coupled Resonant Wireless Power Transfer System with Adjustable-position Intermediate Coil for Stable Transmission Characteristics

Vol. 19, No. 1, pp. 211-219, Jan. 2019

10.6113/JPE.2019.19.1.211

Intermediate coil

Magnetically coupled resonant

Spatial scales

Stable transmission characteristics

wireless power transfer

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Abstract

In magnetically coupled resonant (MCR) wireless power transfer (WPT) systems, the introduction of additional intermediate coils is an effective means of improving transmission characteristics, including output power and transmission efficiency, when the transmission distance is increased. However, the position of intermediate coils in practice influences system performance significantly. In this research, a three-coil MCR WPT system is adopted as an exemplification for determining how the spatial position of coils affects transmission characteristics. With use of the fundamental harmonic analysis method, an equivalent circuit model of the system is built to reveal the relationship between the output power, the transmission efficiency, and the spatial scales, including the axial, lateral, and angular misalignments of the intermediate and receiving coils. Three cases of transmission characteristics versus different spatial scales are evaluated. Results indicate that the system can achieve relatively stable transmission characteristics with deliberate adjustments in the position of the intermediate and receiving coils. A prototype of the three-coil MCR WPT system is built and analyzed, and the experimental results are consistent with those of the theoretical analysis.

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Cite this article

[IEEE Style]

X. Chen, L. Chen, W. Ye, W. Zhang, "Three-coil Magnetically Coupled Resonant Wireless Power Transfer System with Adjustable-position Intermediate Coil for Stable Transmission Characteristics," Journal of Power Electronics, vol. 19, no. 1, pp. 211-219, 2019. DOI: 10.6113/JPE.2019.19.1.211.

[ACM Style]

Xuling Chen, Lu Chen, Weiwei Ye, and Weipeng Zhang. 2019. Three-coil Magnetically Coupled Resonant Wireless Power Transfer System with Adjustable-position Intermediate Coil for Stable Transmission Characteristics. Journal of Power Electronics, 19, 1, (2019), 211-219. DOI: 10.6113/JPE.2019.19.1.211.