Abstract
Power transfer efficiency is an important issue in wireless power transfer (WPT). In actual applications, the WPT system may be exposed to a complex electromagnetic environment. The metal which is inevitably or accidentally close to the system will impact the power transfer efficiency. Most previous research has aimed at the effect of the metallic sheet paralleled to the resonant coil. This paper focuses on the effect of the metallic plate perpendicular to the resonant coils. Firstly, based on the theoretical analysis, a simulation model is setup using COMSOL Multiphysics. The efficiencies of the double-coils magnetic resonant WPT system with the presence of the parallel and vertical aluminum plate are studied comparatively. Efficiency improvement is observed with the vertical plate while the reduction appeared with the presence of the parallel plate. The vertical metallic plate has shown a magnetic field shielding effect according to the magnetic field distribution. It can reduce the radial magnetic field and enhance the axial magnetic field. Then, the effects of the position and size of the vertical plate are studied. It is found that the transfer efficiency has a preferable improvement when the vertical aluminum plate with a larger size is placed between the resonant coils and near outer edge of the windings. Finally, the experiment is carried out to verify the effect of the vertical aluminum plate on the WPT system.
Highlights
Wireless power transmission (WPT) refers to a class of technologies that transfer electric energy without wires
The resonant coils are produced with the printed circuit board (PCB) technology with a similar size as the simulation model
This paper studied the effect of the vertical metallic plate on the efficiency of the WPT system
Summary
Wireless power transmission (WPT) refers to a class of technologies that transfer electric energy without wires. The introduction of the metal components will affect the magnetic field distribution These will influence the power transfer efficiency and degrade the performance of the WPT system. The eddy current induced in the metal obstacles causes temperature rise and energy consumption Methods such as frequency adjustment, impedance matching and structure optimization can diminish the impact of the metal obstacles [35–38], the system still have lower energy transfer efficiency with the presence of the metal obstacles. The metal obstacles perpendicular to the coils are common and important in the actual application of the WPT system The effect of these obstacles on the performance of the system should be studied. The WPT experiment is conducted to verify the effect of the vertical metallic plate
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