A Misalignment Tolerate Integrated S-S-S-Compensated WPT System with Constant Current Output

This paper proposes a cooperative (Cx) coil design for the series-series-series (S-S-S)-compensated wireless power transfer (WPT) system to improve the horizontal misalignment tolerance and the system efficiency. The Cx coil is formed by four series-connected rectangular coils and integrated into th...

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Bibliographic Details
Published inEnergies (Basel) Vol. 16; no. 6; p. 2798
Main Authors Yuan, Zhaoyang, Yang, Qingxin, Zhang, Xian, Ma, Xianjie, Wang, Ran, Xue, Ming, Zhang, Pengcheng
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.03.2023
Subjects
Battery chargers
Circuit design
constant current (CC) output
cooperative coil
Decoupling
Design
Design and construction
Design techniques
Efficiency
Electric coils
Inductance
Innovations
Methods
Misalignment
misalignment tolerance
Receivers & amplifiers
Transmitters
wireless power transfer (WPT)
China
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Summary:This paper proposes a cooperative (Cx) coil design for the series-series-series (S-S-S)-compensated wireless power transfer (WPT) system to improve the horizontal misalignment tolerance and the system efficiency. The Cx coil is formed by four series-connected rectangular coils and integrated into the transmitter (Tx) coil to provide a coupling variation opposite to that of the Tx coil, obtaining the constant equivalent mutual inductance (MI). The design overcomes the problem that the decoupling-designed intermediate coil does not participate in system energy delivery under the well-aligned condition. A misalignment tolerant design with the zero-phase-angle (ZPA) input and load-independent constant current (CC) output conditions is presented based on the Delta-Wye network transform and linear regression. A comparison between the proposed design and a two-coil system using a similar amount of copper, i.e., the Tx coil plus the Cx coil, is made. Finally, a 218.08 W/85.85 kHz scaled-down prototype with the proposed Cx coil is demonstrated to validate the performance and effectiveness of the design. The proposed design can maintain at over 82% efficiency, and offer the ZPA input and load-independent CC output within a misalignment tolerant range of 50% of the length of the receiver coil, as the load varies from 10 Ω to 25 Ω.
ISSN:1996-1073
1996-1073
DOI:10.3390/en16062798