Quasi-uniform magnetic field generated by multiple transmitters of magnetically-coupled resonant wireless power transfer

Zhang, Yiming; Lü, Tao; Zhao, Zhengming; He, Fei; Chen, Kainan; Yuan, Liqiang

doi:10.1109/icems.2015.7385189

Cited by 4 publications

(1 citation statement)

References 8 publications

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“…Consequently, to achieve efficient energy transfer along with greater degree of freedom, in terms of RX-coil position, such WPT systems require frequency tracking [3] and automatic impedance matching [3,4]. In order to create uniform magnetic field strength distribution at a receiving plane, various TX-coil designs are developed [1,[5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Optimization of a Two-Layer 3D Coil Structure with Uniform Magnetic Field

Vinko

Bilandžija

Radivojević

2021

Wireless Power Transfer

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Conventional magnetically coupled resonant wireless power transfer systems are faced with resonant frequency splitting phenomena and impedance mismatch when a receiving coil is placed at misaligned position. These problems can be avoided by using uniform magnetic field distribution at receiving plane. In this paper, a novel 3D transmitting coil structure with improved uniform magnetic field distribution is proposed based on a developed optimization method. The goal is to maximize the average magnetic field strength and uniform magnetic field section of the receiving plane. Hence, figures of merit (FoM1 and FoM2) are introduced and defined as product of average magnetic field strength and length or surface along which uniform magnetic field is generated, respectively. The validity of the optimization method is verified through laboratory measurements performed on the fabricated coils driven by signal generator at operating frequency of 150 kHz. Depending on the allowed ripple value and predefined coil proportions, the proposed transmitting coil structure gives the uniform magnetic field distribution across 50% to 90% of the receiving plane.

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Section: Introductionmentioning

confidence: 99%

Optimization of a Two-Layer 3D Coil Structure with Uniform Magnetic Field

Vinko

Bilandžija

Radivojević

2021

Wireless Power Transfer

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Resonance-filtering combo system for continuous wireless charging range coverage

Sağlam

Tekin

2020

Wirel Pow Transfer

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Distribution of wireless power charging field uniformly on a large area pad is critical for power receivers, particularly for wearable devices, wherein small form factor coils are involved. Since the receiver coil size is quite limited in these types of applications, the device is very sensitive to the amount of field it could retain and hence, it needs special placement or snapping mechanism to fix it at an optimum location for reliable wireless charging. In order to overcome this limitation for the end-user, a dual-mode multi-coil power transceiver system is proposed; utilizing resonance filtering to increase the amount of total power delivered with the rather uniform spatial distribution. Two concentric coils; center one driven by 6.78-MHz high-frequency driver (A4WP) and the outer larger one with a 200-KHz low-frequency driver (Qi) with resonant blocker could transfer up to 50 mW standards compliant flat power to a 13-mm radius 30-turns wearable receiver coil everywhere across an 8-cm radius charging pad area without any alignment requirement or snapping. Two different feedback topologies corresponding to each of the H-Bridge power drivers were also presented as an automatic series resonance coil drive frequency lock mechanism, extracting peak powers for each system individually from a standard 5 V-1A USB wall charger.

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Robust 3-D Wireless Power Transfer System Based on Rotating Fields for Multi-User Charging

Wang

Mei

et al. 2021

IEEE Trans. Energy Convers.

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Quasi-uniform magnetic field generated by multiple transmitters of magnetically-coupled resonant wireless power transfer

Cited by 4 publications

References 8 publications

Optimization of a Two-Layer 3D Coil Structure with Uniform Magnetic Field

Optimization of a Two-Layer 3D Coil Structure with Uniform Magnetic Field

Resonance-filtering combo system for continuous wireless charging range coverage

Robust 3-D Wireless Power Transfer System Based on Rotating Fields for Multi-User Charging

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