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<p>The widespread use of smart electronic devices, such as smartphones, laptops, tablet personal computers, light-emitting-diode lights, and display panels, is driving the increasing demand for wireless charging. In traditional wireless power transfer (WPT) systems, misalignment and a large distance between the transmitter and receiver coils significantly reduce the power received by the receiver coil. The transmitter and receiver can be placed on the floor, a wall, or a table to wirelessly supply power to multiple loads in a two-dimensional autonomous array. While the use of ferrite as a transmission medium is expensive, it is advantageous for reducing the transmitter size and the number of coil turns since ferrite has higher permeability than air. This study compared and analyzed ferrite transmission media and transmitter and receiver coil structures suitable for wireless charging of multiple smart devices. The resonance characteristics of ferrite and the coils of the transmitter and receiver were determined through MATLAB simulations and experiments. A 100&#xa0;W prototype with two types of transmitter coils—horizontal type and diagonal type—was developed and tested in the frequency range of 50–100&#xa0;kHz. The experimental results showed that two-dimensional free placement and multi-load WPT were possible for both transmitter coils.</p>

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Study on Characteristics of Ferrite Transmission Medium for 2D Free-Arrangement and Multi-Load Wireless Power Transfer Systems

  • 期刊论文

  • 发表日期：

    2025年8月19日

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  • Jin-Yong Bae,
  • Lei Bai

摘要

The widespread use of smart electronic devices, such as smartphones, laptops, tablet personal computers, light-emitting-diode lights, and display panels, is driving the increasing demand for wireless charging. In traditional wireless power transfer (WPT) systems, misalignment and a large distance between the transmitter and receiver coils significantly reduce the power received by the receiver coil. The transmitter and receiver can be placed on the floor, a wall, or a table to wirelessly supply power to multiple loads in a two-dimensional autonomous array. While the use of ferrite as a transmission medium is expensive, it is advantageous for reducing the transmitter size and the number of coil turns since ferrite has higher permeability than air. This study compared and analyzed ferrite transmission media and transmitter and receiver coil structures suitable for wireless charging of multiple smart devices. The resonance characteristics of ferrite and the coils of the transmitter and receiver were determined through MATLAB simulations and experiments. A 100 W prototype with two types of transmitter coils—horizontal type and diagonal type—was developed and tested in the frequency range of 50–100 kHz. The experimental results showed that two-dimensional free placement and multi-load WPT were possible for both transmitter coils.