A Comparative Study on Overall Efficiency of Two-Dimensional Wireless Power Transfer Systems Using Rotational and Directional Methods

Wang, Hanwei; Zhang, Cheng; Yang, Yun; Liang, Hui; Hui, S.Y.R.

doi:10.1109/tie.2020.3048317

Cited by 32 publications

(16 citation statements)

References 14 publications

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“…The magnetic field vector is defined as the ratio of current of the x-, y-, and z-resonators [13]. By shaping the magnetic field vector, we can control its direction(figure 8(b), subplots), and therefore optimize the efficiency for a receiver with any random orientations.…”

Section: Omni-directional Metasurfaces With 3d Unit Cellsmentioning

confidence: 99%

“…To improve the transmission efficiency and better confine the magnetic field, one common approach is to increase the number of transmitting coils (Tx coils) [3][4][5][6][12][13][14]. Control algorithms, such as Magnetic multiple-input multiple-output (MIMO) [3], MultiSpot [4], hybrid directional and rotational WPT [13], and adaptive phased-array for WPT [14], will optimize the transmission efficiency by controlling the input power and driving phase of each Tx coil. To achieve these algorithms, each Tx coil requires an independent power source that has controllable output voltages and phase-shift.…”

Section: Introductionmentioning

confidence: 99%

“…To achieve these algorithms, each Tx coil requires an independent power source that has controllable output voltages and phase-shift. The high demands of power electronic circuits for the Tx coils limit their numbers, typically below nine [3,4,6,[12][13][14]. As a result, even with the state-of-the-art control algorithms [13], the efficiency is marginally improved by less than 10% compared to the original single Tx coil system.…”

Section: Introductionmentioning

confidence: 99%

“…The high demands of power electronic circuits for the Tx coils limit their numbers, typically below nine [3,4,6,[12][13][14]. As a result, even with the state-of-the-art control algorithms [13], the efficiency is marginally improved by less than 10% compared to the original single Tx coil system. Another approach is to enhance the transmission with passive resonant coils [15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

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A wearable metasurface for high efficiency, free-positioning omnidirectional wireless power transfer

2021

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We introduce a design principle of metasurfaces that can form any desired distribution of magnetic field for high-efficiency wireless power transfer centered at 200 kHz, which can be used to efficiently charge implanted medical devices. This metasurface can improve the power transfer efficiency for both single-user and multi-user cases by over tenfold compared to those without the metasurface. Our design enables a robust field distribution to the positions of the transmitting and receiving coils, as well as the geometric distortions of the metasurface itself, demonstrating its feasibility as a wearable device. With our design, the field distribution and subsequent power division among the multiple users can be readily controlled from equal distribution to any selective user(s). When incorporating a three-dimensional unit cell of the metasurface, we theoretically demonstrate an omnidirectional control of the field orientation to achieve a high-efficiency wireless power transfer for multiple users.

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Section: Omni-directional Metasurfaces With 3d Unit Cellsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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A wearable metasurface for high efficiency, free-positioning omnidirectional wireless power transfer

2021

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“…To overcome the above obstacles and contribute to the development of WPT, technology researchers decided to put forward the possibility of beaming the magnetic field to the target site. This new concept allows directional control of the resulting magnetic field by adopting a certain topology at the transmitting end, thus reducing the magnetic flux leakage problem and increasing the efficiency when compared to the rotational WPT [13]. In [14], the target load is magnetically tracked by an energy beaming approach using a crossed antenna structure at the transmitting end using a resonant coupling mechanism.…”

Section: Introductionmentioning

confidence: 99%

2D Omni-Directional Wireless Power Transfer Modeling for Unmanned Aerial Vehicles with Noncollaborative Charging System Control

Allama

Habaebi

Khan³

et al. 2021

Electronics

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Wireless power transfer (WPT) has been extensively studied from various aspects such as far field and near field, operating frequency, coil design, matched capacitance values, misaligned locations of transmitting and receiving coils, distance variance between them, target loads in the specific locations, environment, and operating conditions. This is due to the usefulness of WPT technology in many applications, including the revolutionary method of auto-recharging of unmanned aerial vehicles (UAVs). This paper presents analytical modeling of a WPT-link with two orthogonal transmitting coils arranged to produce an omnidirectional magnetic field suitable for charging a moving rotating load, maximizing energy transfer without any feedback from the receiving end. To achieve a suitable 2D WPT simulation system, as well as an accurate control design, the mutual coupling values in terms of receiver angular rotation are simulated using Ansys software. Power transfer is maximized by using extremum seeking control (ESC), making use of the input power as an objective function with specific parameter values that represent the WPT model to obtain the results. The results shown are those of the input power transmitted by the transmitting-end coils to a load of an orbiting mobile UAV. Based on the simulation results, the controller can achieve maximum power transfer in 100 µs of duration when the speed of the UAV is close to 314 rad/s.

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C2DD—An omnidirectional receiver based on single‐coil transmitter

Tian,

Guo,

Chen

et al. 2023

Circuit Theory & Apps

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In this paper, the omnidirectional receiver (Rx) of wireless power transfer (WPT) system is proposed, making any transmitter (Tx) into omnidirectional Tx. The omnidirectional Rx is composed of the quadrature double‐D (DD) coils and circular coil in series (C2DD). The C2DD Rx can utilize the toroidal magnetic field (TMF) and the linear magnetic field (LMF). The paper presents the circuit diagram model of WPT system. Based on the analysis of circuit model, the smooth mutual inductance of system is responsible for stable transmission performance during C2DD Rx movement. The result of numerical calculation and magnetic field simulation verifies the omnidirectional capability of the C2DD Rx with circular Tx as an example. Experiment shows that the C2DD Rx receives power in any direction. The C2DD Rx can receive maximum transmission power of 7.1 W with maximum transmission efficiency of 59%.

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A Comparative Study on Overall Efficiency of Two-Dimensional Wireless Power Transfer Systems Using Rotational and Directional Methods

Cited by 32 publications

References 14 publications

A wearable metasurface for high efficiency, free-positioning omnidirectional wireless power transfer

A wearable metasurface for high efficiency, free-positioning omnidirectional wireless power transfer

2D Omni-Directional Wireless Power Transfer Modeling for Unmanned Aerial Vehicles with Noncollaborative Charging System Control

C2DD—An omnidirectional receiver based on single‐coil transmitter

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