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%.
Highlights
Internal combustion engine vehicles, the most prevailing transportation in past decades, contribute to the undesired emission of global greenhouse gas, spurring research into electric vehicles (EVs) and the smart grid [1]
wireless power transfer (WPT) systems mainly focus on stationary charging applications such as medical implants [6], household appliances and stationary EVs [7]
In a stationary EVs charging situation, the vehicle is required to park in the designated position, and the receiver coil should be well-aligned with the transmitter coil, which is worrisome [8]
Summary
The most prevailing transportation in past decades, contribute to the undesired emission of global greenhouse gas, spurring research into electric vehicles (EVs) and the smart grid [1]. In [15,16], multiple short transmitters are arranged on the lane of the vehicle, and the system is flexible for design and installation It requires a great quantity of compensation components, and the output power reduces to almost zero between two transmitters. Energies 2018, 11, 45 requires a great quantity of compensation components, and the output power reduces to almost zero between transmitters duepoint to the[17]. This paper ofof the fluctuation byby optimizing thethe overlap of the the transmitter coils, which is taken not taken account byaforementioned the aforementioned research. Six transmitter coils coils are adopted to form a track, and all the coils are powered by a three-phase inverter. Each are adopted to form a track, and all the coils are powered by a three-phase inverter.
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