Simultaneous 3-D Wireless Power Transfer to Multiple Moving Devices With Different Power Demands

Tang, Weiyi; Zhu, Qi; Yang, Jian; Song, Dongran; Su, Mei; Zou, Runmin

doi:10.1109/tpel.2019.2942098

Cited by 37 publications

(10 citation statements)

References 25 publications

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“…However, the PTE of WPT system will decrease rapidly when the misalignment between the coils occurs due to the reduction of the mutual coupling of the resonators. In order to reduce the influence of misalignment on PTE, several methods have been proposed in previous papers, such as coil design [118][119][120][121], control strategy [122,123] and capacitance compensation [124]. The introduction of EMMM can also creatively solve the misalignment issue of the WPT system.…”

Section: Misalignment Tolerancementioning

confidence: 99%

A critical review of metamaterial in wireless power transfer system

Chen

Zeng

et al. 2021

IET Power Electronics

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Wireless power transfer (WPT) is a promising charging method without physical contact for the electronic products energy supply. However, low transfer efficiency, short transmission distance, as well as the electromagnetic (EM) leakage are commonly main bottlenecks of the WPT technology in the practical applications. The electromagnetic metamaterials (EMMMs) used in WPT system have opened up a brand-new approach for better transfer properties and EM shielding. This paper is intended to provide an overview of the current studies and breakthroughs of the WPT system based on EMMMs. First, we demonstrate the fundamentals of the WPT based on the magnetic resonant coupling. Then, various key considerations of the EMMMs, such as working mechanisms, fabrications have been taken into accounted in detail. Moreover, the applications of EMMM in WPT systems are elaborated. Finally, the technical challenges in connection with working frequency and design miniaturization are investigated in this paper. This novel interdisciplinary technology shows important meanings on the extensive application of energy transmission in the future.

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Section: Misalignment Tolerancementioning

confidence: 99%

A critical review of metamaterial in wireless power transfer system

Chen

Zeng

et al. 2021

IET Power Electronics

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“…The transmission efficiency of conventional WPT systems is sensitive to the alignment of the transmitter (Tx) coil and the receiver (Rx) coil, which limits the coverage area. Recently, omnidirectional WPT in three-dimensional (3D) space have been introduced to enable ubiquitous wireless charging [2], [5]- [12]. For example, such ubiquitous WPT solution would enable wireless charging of multiple consumer electronics devices (e.g.…”

Section: Introductionmentioning

confidence: 99%

“…There have been different proposals to enable efficient omnidirectional WPT [2], [5]- [12]. Primarily, there are two types of omnidirectional WPT systems: 1. a single 3D Tx coil with multiple windings in different directions; and 2. multiple Tx coils at different orientations.…”

Section: Introductionmentioning

confidence: 99%

Self-Tuning Omnidirectional Wireless Power Transfer Using Double-Toroidal Helix Coils

Jayathurathnage

Dang

Simovski

et al. 2022

IEEE Trans. Ind. Electron.

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We suggest and study a novel omnidirectional wireless power transfer (WPT) system based on unusual double toroidal helix coils. The suggested antenna is a double-helix coil wounded around a torus. It creates two mutually orthogonal magnetic fields. One is toroidal and confined inside the torus, another one is poloidal and is distributed outside it. The intensities of these two fields can be independently tuned via the geometry of the turns. The coupling coefficients are tailored to ensure high efficiency regardless of the receiver position and orientation, without active circuitry for tuning or control. This topology provides self-tuning functionality which is achieved when the coupling between the transmitter and receiver is minimized while the coupling in the pairs transmitterrepeater and repeater-receiver is strong. The system consists of three transmitter-repeater pairs orthogonal to each other, ensuring omnidirectional functionality. Experimental results confirm self-tunability and high efficiency for any position and orientation of receivers. The proposed doublehelix antenna is applicable to different WPT applications where the coupling/decoupling between coils can be freely controlled.

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“…(1) Orthogonal coil: orthogonal structure is currently the most commonly used in omnidirectional WPT systems due to simple structure and great homogeneity of 3D MF [3][4][5][6][7][8][9][10][11][12][13]. Fig.…”

Section: Introductionmentioning

confidence: 99%

Omnidirectional Free-Degree Wireless Power Transfer System Based on Magnetic Dipole Coils for Multiple Receivers

Chen

Liu

et al. 2021

IEEE Access

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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 multiplepickup 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.

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Simultaneous 3-D Wireless Power Transfer to Multiple Moving Devices With Different Power Demands

Cited by 37 publications

References 25 publications

A critical review of metamaterial in wireless power transfer system

A critical review of metamaterial in wireless power transfer system

Self-Tuning Omnidirectional Wireless Power Transfer Using Double-Toroidal Helix Coils

Omnidirectional Free-Degree Wireless Power Transfer System Based on Magnetic Dipole Coils for Multiple Receivers

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