Intermediate coils are used in wireless power transfer to improve system performance, such as power transfer capability and efficiency. However, they can have adverse effects if used improperly. This paper focuses on the coil coupling stage of three-coil series-compensated wireless power transfer systems and analyses the effects of the intermediate coil under different conditions. When the coupling between the transmitter and the receiver is high, the intermediate coil usually brings negative effects; only when the coupling is weak can it possibly improve power transfer capability or efficiency. Then, the criteria in deciding the necessity of adopting an intermediate coil and the conditions to be met to improve output power and efficiency are proposed. Simulation is carried out for verification. Experiments are done on an EV-based wireless power transfer prototype. When the coupling coefficient is as low as 0.05 between the transmitter and receiver, the coil coupling efficiency is improved from 84.7% to 91.0% with the help of a carefully-designed intermediate coil.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Effects of intermediate coil on power transfer capability and efficiency in three-coil wireless power transfer system


    Contributors:
    Zhu, Guodong (author) / Gao, Dawei (author)


    Publication date :

    2017-08-01


    Size :

    1323621 byte




    Type of media :

    Conference paper


    Type of material :

    Electronic Resource


    Language :

    English




    COIL ARRANGEMENT AND WIRELESS POWER TRANSFER SYSTEM COMPRISING A COIL ARRANGEMENT

    LOHMANN THOMAS | European Patent Office | 2020

    Free access

    Concrete-embedded wireless power transfer coil

    BOHM RYAN J / GARDNER TREVOR G / HALLING MARVIN et al. | European Patent Office | 2020

    Free access

    Power transfer coil

    ICHIKAWA KATSUEI | European Patent Office | 2023

    Free access

    Power reception coil device and wireless power transfer system

    TOKURA SUSUMU / HARA MASAKAZU / FURIYA KENTAROU et al. | European Patent Office | 2019

    Free access