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Abstract
Magnetic resonant wireless power transmission (MRWPT) is a method of transmitting power over a long distance at a specific frequency. Because this system uses an alternating magnetic field, if an object with electrical/magnetic properties is placed between the transmit and receive coils, this will have a significant impact on the power transfer. In this paper, the effect of an obstacle located between two coils on the resonance frequency and transmission power is analyzed. A wireless power transmission system with a resonant frequency of 20 kHz was designed, and ferrite, aluminum, and carbon steel were selected as obstacles with permeability or conductivity. After simulating the system with finite element analysis (FEA) with these obstacles, the results were verified through actual experiments. The results show that the permeability of the obstacle decreases the resonant frequency, and the conductivity increases the resonant frequency and greatly reduces the output power. In addition, part of reduced output could be recovered by adjusting the frequency.
Highlights
Properties of Obstacles in MagneticMagnetic resonant wireless power transmission (MRWPT) is a method that can transmit power farther distances than the conventional WPT [1]
Because power is transmitted through the alternating magnetic field, if an object that affects the magnetic field is located between the transmitting and receiving coils, it changes the resonant frequency and affects the transmission power and efficiency [2–4]
Due to the characteristics of the MRWPT operating at the resonant frequency, the influence of the obstacle will show various aspects according to its electrical/magnetic properties, but the effect of these properties on the resonant frequency or output power has not been studied
Summary
Magnetic resonant wireless power transmission (MRWPT) is a method that can transmit power farther distances than the conventional WPT [1]. This method uses an additional resonance phenomenon, enabling high efficiency power transmission only at certain resonant frequencies. Because power is transmitted through the alternating magnetic field, if an object that affects the magnetic field is located between the transmitting and receiving coils, it changes the resonant frequency and affects the transmission power and efficiency [2–4]. Due to the characteristics of the MRWPT operating at the resonant frequency, the influence of the obstacle will show various aspects according to its electrical/magnetic properties, but the effect of these properties on the resonant frequency or output power has not been studied.
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