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A Planar Omnidirectional Wireless Power Transfer Platform for Portable Devices

Year: 2023 | Author: Xipei Yu | Paper: H3.1
Transmitter coil structure
Fig. 1. Proposed transmitter coil structure.
  Nowadays, wireless power transfer (WPT) is an emerging technology and the related market is booming, owing to the convenience that it can charge without physical contact. Portable devices such as mobile phones comprise a large proportion of the WPT market. However, the majority of ongoing WPT products are directional and planar; although WPTs can be easily carried or integrated, they can only charge in one direction. Some structures (bowl, ball, or cube-shaped WPT systems) have been proposed to realize omnidirectional transfer; however, these designs suffer from inconvenience and integration problems. To address these problems, a planar omnidirectional WPT system is proposed. In Fig. 1, three sets of coils are designed to generate magnetic fields in three directions. By controlling the excitation current flowing through the set of three transmitter coils, the total magnetic field can be aimed in any direction.

  The magnetic field distribution above the planar charging surface at different time instants is shown in Fig. 2
Magnetic field distribution
Fig. 2. The magnetic field distribution above the proposed transmitter coil structure.
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  The omnidirectional field is induced in the region above the charging setup. Therefore, there is no longer any need to align the receiver coil with the transmitter coil. The transmitter can transfer energy in any direction and the charging orientation freedom is greatly improved.

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