Abstract
To improve the efficiency of the wireless power transfer (WPT) system without increasing the system size, a central bulge ferrite core with a novel configuration is proposed. The mutual inductance between magnetic coupling structures is able to increase obviously, which is approved by eigenfunction expansion method. In this paper, the mathematical models of the planar core and the central bulge core are established, respectively, as two types of the mutual inductance are calculated in same condition. The structure parameters of the central bulge ferrite core are further optimized by Maxwell magnetic field simulation. Experiments are conducted to compare the WPT efficiency of two types of ferrite cores in improving the efficiency of WPT system, in which the influence of transmission distance, lateral misalignment, and load variation are taken into account. The results show that central bulge ferrite core has better performance in WPT efficiency than the planar one, even in the case of long power transfer distance and lateral misalignment.
Highlights
With the recent development of electrification, the wireless power transmission has been increasingly used in electric vehicles chargers, biomedical devices, environmental monitoring technology, and robotic systems for the advantages of safety, flexibility, and convenient maintenance [1,2,3,4,5,6]
A novel structure of the central bulge ferrite core is proposed, which can effectively increase the mutual inductance of the magnetic coupling without increasing the size of the wireless power transfer (WPT) system, thereby significantly improving the power transmission efficiency
The improved mathematical models to calculate the mutual inductance of the planar core and the proposed central bulge core are established, and the Fourier–Bessel transform is used to analyze the boundary conditions of the magnetic field
Summary
With the recent development of electrification, the wireless power transmission has been increasingly used in electric vehicles chargers, biomedical devices, environmental monitoring technology, and robotic systems for the advantages of safety, flexibility, and convenient maintenance [1,2,3,4,5,6]. Increasing the size of inductive coupling coils can enhance the magnetic field to improve transmission efficiency [12]. To improve the weak coupling magnetic field of the separate coils, adding square and circular planar ferrite core can make a better balance between power transfer efficiency and system size [20,21]. A new structure of circular and rod cores is proposed in [23] to achieve a better misalignment tolerance and lower loss, but analytic calculation of magnetic field for the special-shaped cores is not included in this paper. Inspired by the works in [23,24], a central bulge ferrite core is proposed in this paper to increase power transfer efficiency while controlling the system size.
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