Abstract
Though impressive advances of the extension of effective working distance for magnetic resonant coupling wireless power transfer system have been made over past decades, their applications have been severely limited by the requirement of unidirectional coaxial distribution for the transmitter and receiver. In this paper, an omnidirectional magnetic resonant coupling wireless power transfer system is proposed. The cubic spiral transmitter requires only a single power source, and the receiver receives power in all directions. The power transfer efficiency of the system is derived through an equivalent circuit model. And an impedance matching circuit which includes a pair of parallel and series capacitors is proposed for better stability and higher efficiency. In addition, geometrical parameters of the single power driven spiral transmitter structure are optimized to improve distribution uniformity for different directions. Thus the power transfer efficiency of the system, which depends on the distance between the transmitter and the receiver, is almost the same for different receiving angles. Finally, the theoretical analysis is verified by practical experimental results, which shows the power transfer efficiency of 60% at 150 mm.
Highlights
The ever fast development of mobile phones, computers and other various electrical equipment has demonstrated to facilitate and enrich our daily life greatly
Though impressive advances of the extension of effective working distance for magnetic resonant coupling wireless power transfer system have been made over past decades, their applications have been severely limited by the requirement of unidirectional coaxial distribution for the transmitter and receiver
External measuring and a feedback control loop using expensive oscilloscopes and computers lead to economic scitation.org/journal/adv consideration. Another omnidirectional magnetic resonant coupling wireless power transfer (MRCWPT) system using a simple control method was proposed in Refs. 17–20, but the magnetic field distribution is different for various directions
Summary
The ever fast development of mobile phones, computers and other various electrical equipment has demonstrated to facilitate and enrich our daily life greatly. The wireless power transfer (WPT) technology has attracted much attention because of its great application potential in the field of charging for portable devices, robots, electric cars, etc.. Magnetic resonant coupling wireless power transfer (MRCWPT) technology can achieve high efficiency over a long distance, which has great development prospect and broad market demand.. 14–16 require complex control methods to realize magnetic field distribution uniformly in all directions. To resolve this issue, another omnidirectional MRCWPT system using a simple control method was proposed in Refs. The novel spiral transmitter consists of four simple planar spiral coils in series, and the transmitter combines the advantages of conventional MRCWPT systems which can achieve high efficiency over a relatively long distance. The magnetic field distribution of the omnidirectional MRCWPT system is uniform in all directions, and the system can achieve relatively high efficiency. A practical omnidirectional MRCWPT system is fabricated, and the PTE is measured in terms of the receiving angles and the distance between the transmitter and the receiver
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