A Vertically Modularized Reconfigurable Wireless Power Transfer System: Architecture, Modeling, and Design

Zhang, Huan; Shao, Yaoxia; Kang, Ning; Qin, Haojun; Ma, Chengbin; Liu, Ming

doi:10.1109/tpel.2022.3208315

Cited by 8 publications

(2 citation statements)

References 18 publications

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“…On the other hand, operating at a high frequency offers benefits of improved spatial freedom and compactness in circuit design [13], [22]. Frequencies up to several hundred kilohertz (kHz) or even mega-hertz (MHz) have been widely used to obtain robust coupling between air-core coils which have more benefits compared to the conventional couplers using bulky and costly ferrite cores.…”

Section: Introductionmentioning

confidence: 99%

“…Regarding the low coupling coefficient k with air-core coils, operations in MHz frequency range can easily compensate its negative effect to the WPT efficiency since the quality factor Q is greatly improved in the MHz range [23]. However, increasing operating frequency also brings limitations to the system performance, especially with regard to parasitic parameters, which are no longer negligible at MHz frequencies [13], [22]. Thorough considerations of parasitic effects reveals importance of ensuring design accuracy and optimizing the system performance.…”

Section: Introductionmentioning

confidence: 99%

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Design and Performance Analysis of a Repeater-Assisted Multireceiver Wireless Power Transfer System Operating at MHz Frequencies

Liu,

Ha-Van,

Jayathurathnage

et al. 2023

IEEE Open J. Ind. Electron. Soc.

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Simultaneous wireless power transfer (WPT) to multiple receivers (Rxs) is an important requirement for wireless charging of consumer electronic devices. In this paper, we propose a WPT coil structure capable of achieving independent multi-Rx WPT with a confined and uniform rotating magnetic field at megahertz (MHz) operating frequencies. Compared with the existing multiple receiver WPT structures, the proposed structure exhibits low leakage flux outside the power transmitter. Thanks to the single-coil transmitter structure and the load-independent current feature in the repeater coil, no additional control circuit is needed to obtain independent power transfer to multiple receiver devices. The proposed solution is experimentally demonstrated in a 6.78 MHz 80 W WPT prototype, with a dc-to-dc efficiency of 90.2 % in the full-load case using four 20 W receiver circuits.INDEX TERMS wireless power transfer (WPT), multiple receivers, confined magnetic field, Megahertz (MHz), parasitic effects.

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Section: Introductionmentioning

confidence: 99%