Abstract
Wireless power transfer (WPT) technology offers a potential solution for the energy-supply problem. In this paper, we propose a novel magnetic coupling mechanism for omnidirectional and multiple-pickup energy transfer based on the magnetic dipole coils. Firstly, a cubic transmitter structure capable of generating three-dimension (3D) homogeneous magnetic field is fabricated to weaken directional sensitivity of receiving coil. Furthermore, the direction of current flowing through each dipole coil is also studied in detail. Numerical and simulated analysis is implemented to verify the omnidirectionality of the transmitter. Secondly, the equivalent circuit model for WPT systems with ferrite is analyzed. In addition, optimal loads, power distribution and transfer efficiency for multiple receivers are discussed and used to achieve the proper system design. Finally, experimental prototype is set up to validate the transmission performance of the proposed WPT system. The results have showed that genuine 3D high degree of freedom (DoF) can be achieved. Meantime, above 60% efficiency at least 30 W of total output power can be obtained for WPT systems with eight pick-ups. We believe the proposed system will give a new guideline for future low power electronic applications, such as monitoring sensors, miniature robots and household devices.
Highlights
Wireless power transfer (WPT) technology has attracted much attention due to many advantages, such as safety, convenience and reliability
Omnidirectional WPT systems have been reported in numerous previous papers, which aimed to be insensitive to the positional misalignment
In order to achieve high power transfer efficiency (PTE) in WPT system for multiple pickups, the load of RX coil needs to get closer to the optimal load and can be slightly higher than it
Summary
Wireless power transfer (WPT) technology has attracted much attention due to many advantages, such as safety, convenience and reliability. Transmitter structure design for omnidirectional uniform magnetic field and current modulation are two common methods against misalignment. The majority of these works were based on a 3D omnidirectional MF and one pick-up receiver, which lacks analysis of multi-load situations. Zhen Zhang et al [31] proposed a continuously adjustable capacitor to improve the energy security performance for multiple pick-ups This method can be used in single-power-induced energy field for WPT systems. A 3D WPT systems based on magnetic dipole coil for omnidirectional and multiple-pickup transmission is proposed. 1) The magnetic dipole coil and cubic transmitter structure are combined to realize omnidirectional wireless charging for multiple pick-ups. It can provide above 30 W output power and about 60% dc-to-load efficiency
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