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      • Maximum Efficiency in the Dynamic Wireless Charging Systems of Electric Vehicles

        Nguyen Thi Diep,Nguyen Kien Trung,Tran Trong Minh 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5

        This paper proposes a maximum transfer efficiency control method in the dynamic wireless charging systems of electric vehicles. A secondary-side controller is proposed to keep the optimal load impedance which is varied according the receiver position. This paper also presents the coupling coefficients estimation method from the secondary side. The simulation and experimental results validate the feasibility of proposed control method. A 1.5 kW dynamic charging prototype is constructed. The simulation and experiment results show that the proposed control method improves 6% on the transfer efficiency in the case of 30% misalignment in the dynamic wireless charging system.

      • Power Control in the Dynamic Wireless Charging of Electric Vehicles

        Nguyen Thi Diep,Nguyen Kien Trung,Tran Trong Minh 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5

        This paper proposes a new power control method which is able to control the varying charging power according to the state of charge of the battery in the dynamic wireless charging of electric vehicle. The advantage is that the dual-side wireless communication is avoided. A dual-loop primary controller is proposed to regulate the charging power which only employs the primary side controller. The information on system parameters and the coupling coefficients are required. However, in the dynamic wireless charging the coupling coefficients change continuously. This paper also presents the coupling coefficients estimation method from the primary side. The simulation and experimental results validate the feasibility of the proposed control method. A 1.5 kW dynamic charging prototype is constructed. The experimental results show that the output power is adjustable in dynamic charging process with error less than 0.2% and the system maximum efficiency from dc source to the optimal load reaches 89.5%.

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