Magnetic Coupling Mechanism With Omnidirectional Magnetic Shielding for Wireless Power Transfer

Dai, Zhongyu; Zhang, Xian; Liu, Tianqi; Pei, Chao; Chen, Ting; Dou, Runtian; Wang, Junhua

doi:10.1109/temc.2023.3266089

Cited by 10 publications

(1 citation statement)

References 28 publications

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“…Reactive shielding uses metal plates and magnetic cores to suppress perpendicular leakage, which exploits the eddy current effect of the metal. This is a simple but costly method, and the eddy current effect also causes heat loss resulting in reduced transmission efficiency [13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Study of a Double-layer Passive Magnetic Shielding System for Electric Vehicle WPT

Zhang,

Ren,

Kong

et al. 2023

PIER C

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In the wireless power transfer (WPT) system of electric vehicles, the magnetic shielding performance often comes at the expense of the transmission efficiency. How to maintain high transmission efficiency while reducing magnetic leakage is a challenge. For this reason, this paper proposes a double-layer passive magnetic shielding coil structure for an electric vehicle WPT system. First, a leakage optimization method is given, and the optimal parameters for each shielding coil are obtained with this method. Second, according to the obtained coil parameters, a WPT system with magnetic shielding for electric vehicles is developed. The correctness of the proposed structure and method is verified by simulation and experiment. Finally, when the system output is 4 kW, the proposed shielding structure not only reduces the maximum leakage field in the target area by 54.64%, but also has a transmission efficiency of 94.8%.

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Section: Introductionmentioning

confidence: 99%

Study of a Double-layer Passive Magnetic Shielding System for Electric Vehicle WPT

Zhang,

Ren,

Kong

et al. 2023

PIER C

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An Improved Magnetic Coupling Resonant Wireless Power Transfer System Based on Ferrite‐Nanocrystalline Hybrid Shielding Method

Hu,

Heng,

Zhang

et al. 2024

Circuit Theory & Apps

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Low‐power magnetic coupling resonant wireless power transfer (MCRWPT) systems are less efficient at long transmission distances due to magnetic leakage and losses. For this reason, combining ferrite‐nanocrystalline hybrid shielding and a relay coil, an improved MCRWPT system based on the LCC‐LCC compensation network is designed in this paper. Firstly, the transmission performance of the MCRWPT systems with S‐S and LCC‐LCC compensation networks are compared and analyzed. Secondly, the transfer efficiencies of the MCRWPT system are analyzed when the relay coil is added at different locations, and the transfer efficiencies of the system with single material shielding are compared. Finally, the transmission performance of the MCRWPT system with ferrite‐nanocrystalline hybrid shieling is analyzed using simulation and experiment. Experimental results show that the transfer efficiency of the low‐power MCRWPT system using relay coil and hybrid shielding increases from 40.38% to 69.17% when the input voltage is 40 V and the transmission distance is 250 mm. Compared with the MCRWPT system based on ferrite full shielding, the weight of the MCRWPT system has been reduced by 63.11%. The hybrid shielding method not only improves the transfer efficiency of the MCRWPT system and reduces its spatial magnetic leakage but also has certain cost advantages.

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Strong misalignment tolerance wireless power transfer with active adjustment of magnetic shielding

Dai,

Li,

et al. 2024

AIP Advances

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The variation of mutual-inductance is the essential reason for fluctuation of transmission power and efficiency during wireless power transfer (WPT) misalign. To maintain output power stability, current methods, such as primary regulation, secondary conversion, magnetic coupling mechanism (MCM) optimization, and compensation topology design, have not changed the characteristic of mutual-inductance changing with misalignment. A strong misalignment tolerance WPT system based on the influence of high permeability magnetic materials on equivalent electrical parameters of MCM is proposed. When the primary and secondary sides of MCM shift, the relative distance between magnetic shielding and coil (RDMSC) is adjusted to maintain the stability of mutual-inductance. The transmission efficiency and power are not affected by misalignment. Alternatively, RDMSC can be actively adjusted to meet the various needs of diverse loads at different times. Simulations and experiments are conducted. The effectiveness of the proposed scheme that RDMSC is actively adjusted to overcome misalignment is verified. This is a new method based on active adjustment of spatial electromagnetic coupling, which provides a new idea for WPT to overcome the influence of misalignment and maintain stable output.

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Magnetic Coupling Mechanism With Omnidirectional Magnetic Shielding for Wireless Power Transfer

Cited by 10 publications

References 28 publications

Study of a Double-layer Passive Magnetic Shielding System for Electric Vehicle WPT

Study of a Double-layer Passive Magnetic Shielding System for Electric Vehicle WPT

An Improved Magnetic Coupling Resonant Wireless Power Transfer System Based on Ferrite‐Nanocrystalline Hybrid Shielding Method

Strong misalignment tolerance wireless power transfer with active adjustment of magnetic shielding

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