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Chen, Xuling,Fu, Xiewei,Jiang, Chong,Pei, Cunhui,Liu, Fuxin The Korean Institute of Power Electronics 2018 JOURNAL OF POWER ELECTRONICS Vol.18 No.4
In single-phase magnetically coupled resonant (MCR) wireless power transfer (WPT) systems, the transfer characteristics, including the output power and transfer efficiency, are significantly influenced by the spatial scales of its coils. As a potential alternative, a three-phase MCR WPT system with cylinder-shaped coils that are excited in a voltage-fed manner has been proposed to satisfy the requirements of compact space. This system adopts a phase-shifted angle control scheme to generate a rotating magnetic field and to realize omnidirectional WPT that is immune to spatial scales. The magnetic field model and equivalent circuit models are built to holistically analyze the system characteristics under different angular misalignments. Research results show that the transfer characteristics can be improved by modulating the phase-shifted angle in each phase. Experiments have also been carried out to evaluate the accuracy of the theoretical analysis and to confirm the validity of the system modeling method.
Chen, Xuling,Chen, Lu,Ye, Weiwei,Zhang, Weipeng The Korean Institute of Power Electronics 2019 JOURNAL OF POWER ELECTRONICS Vol.19 No.1
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.
Xuling Chen,Xiewei Fu,Chong Jiang,Cunhui Pei,Fuxin Liu 전력전자학회 2018 JOURNAL OF POWER ELECTRONICS Vol.18 No.4
In single-phase magnetically coupled resonant (MCR) wireless power transfer (WPT) systems, the transfer characteristics, including the output power and transfer efficiency, are significantly influenced by the spatial scales of its coils. As a potential alternative, a three-phase MCR WPT system with cylinder-shaped coils that are excited in a voltage-fed manner has been proposed to satisfy the requirements of compact space. This system adopts a phase-shifted angle control scheme to generate a rotating magnetic field and to realize omnidirectional WPT that is immune to spatial scales. The magnetic field model and equivalent circuit models are built to holistically analyze the system characteristics under different angular misalignments. Research results show that the transfer characteristics can be improved by modulating the phase-shifted angle in each phase. Experiments have also been carried out to evaluate the accuracy of the theoretical analysis and to confirm the validity of the system modeling method.
Xuling Chen,Lu Chen,Weiwei Ye,Weipeng Zhang 전력전자학회 2019 JOURNAL OF POWER ELECTRONICS Vol.19 No.1
In magnetically coupled resonant (MCR) wireless power transfer (WPT) systems, the introduction of additional intermediatecoils is an effective means of improving transmission characteristics, including output power and transmission efficiency, whenthe transmission distance is increased. However, the position of intermediate coils in practice influences system performancesignificantly. In this research, a three-coil MCR WPT system is adopted as an exemplification for determining how the spatialposition of coils affects transmission characteristics. With use of the fundamental harmonic analysis method, an equivalentcircuit model of the system is built to reveal the relationship between the output power, the transmission efficiency, and thespatial scales, including the axial, lateral, and angular misalignments of the intermediate and receiving coils. Three cases oftransmission characteristics versus different spatial scales are evaluated. Results indicate that the system can achieve relativelystable transmission characteristics with deliberate adjustments in the position of the intermediate and receiving coils. A prototypeof the three-coil MCR WPT system is built and analyzed, and the experimental results are consistent with those of the theoreticalanalysis.