Abstract
As an epoch-making technique, wireless power transfer (WPT) technology has been used in electric vehicle charging devices in recent years, but the electromagnetic leakage problem has always plagued numerous researchers. The traditional wireless charging systems use a solid metal aluminium plate to shield electromagnetic leakage generally. Although it has a good shielding performance, it will seriously reduce the transmission efficiency of wireless charging systems. In this paper, an aluminium plate with a series of mesh holes of different sizes is proposed to weaken the eddy current in partial areas on the plane. Therefore, without changing the maximum magnetic induction intensity of the shielded magnetic field, the influence of the aluminium plate on the electrical parameters of the wireless power transfer system is minimized, and the transmission efficiency of the system is improved. The Ansys Maxwell software has been adopted to simulate the transfer and shielding performance. Finally, the experimental results have verified that the optimized mesh aluminium plate can reduce the interference to the transmission performance of electric vehicle wireless charging system and further improve the electromagnetic environment of the system effectively at the same time.
Highlights
Wireless Power Transfer (WPT) technology is an ideal charging method for ElectricVehicles (EVs) in the future [1]
When the shielded aluminium plate is added to the WPT systems, the resistance of the coil will increase, the inductance will decrease, and the influence on the capacitance can be ignored, resulting in the deviation of the natural resonance frequency, that is, when the frequency aluminium plate is added, the resonance frequency is f0 =
When aluminium plates of different structures are loaded into the wireless transmisWhen aluminium plates of the different structures are of loaded intowill the change wirelessdue transmission system of electric vehicles, resonant frequency the coil to the
Summary
Wireless Power Transfer (WPT) technology is an ideal charging method for Electric. Vehicles (EVs) in the future [1]. Ferrite and aluminium plates are often used as magnetic shielding materials to reduce EM leakage in EVs’ wireless charging systems. Hariri [13] studied the influence of changing various parameters of the shielding body on transmission performance and shielding effect and proposed the use of iterative methods to design the size and thickness of shielding material. For the clear majority of EVs’ wireless charging systems, ferrite is an essential part of the coupling mechanism design, which can shield the magnetic leakage in the working area, and improve the coupling strength between the transmitter and receiver, further improving the transmission performance of the systems.
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