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Energies 2018, 11(1), 45; https://doi.org/10.3390/en11010045

A Three-Phase Dynamic Wireless Charging System with Constant Output Voltage

School of Electrical Engineering, Southwest Jiaotong University, Chengdu 610031, China
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Received: 7 November 2017 / Revised: 17 December 2017 / Accepted: 21 December 2017 / Published: 1 January 2018
(This article belongs to the Special Issue Wireless Power Transfer and Energy Harvesting Technologies)
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Abstract

A dynamic wireless power transfer (WPT) system is an effective method, which can reduce charging time and extend the driving range of the electric vehicles. In the dynamic WPT systems, the output voltage may fluctuate when the receiver moves along the transmitter coils. This paper proposes a three-phase dynamic WPT charging system with overlapped three-phase transmitter coils. The overlap length is optimized to depress the fluctuation of the output voltage. These coils are powered by a three-phase inverter to generate an even magnetic field, and a unipolar coil is employed as a receiver to simplify the coil structure of the secondary side. Based on the proposed three-phase coil structure, the output voltage characteristics of the system are analyzed in detail. A 500 W dynamic charging prototype is established to validate the proposed dynamic charging system. Experimental results show that the output voltage fluctuation is within ±3.05%. The maximum system efficiency reaches 89.94%. View Full-Text
Keywords: wireless power transfer; three-phase inverter; dynamic charging wireless power transfer; three-phase inverter; dynamic charging
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Mai, R.; Li, H.; Liu, Y.; Zhou, K.; Fu, L.; He, Z. A Three-Phase Dynamic Wireless Charging System with Constant Output Voltage. Energies 2018, 11, 45.

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