Single-Transmitter Multiple-Pickup Wireless Power Transfer: Advantages, Challenges, and Corresponding Technical Solutions

Gü, Yü; Jiang, Wang; Liang, Zhenlin; Wu, Yitong; Cecati, Carlo; Zhang, Zhen

doi:10.1109/mie.2020.3002524

Cited by 22 publications

(7 citation statements)

References 47 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…To satisfy the wireless charging demand of more load devices, the IPT systems supporting multiple PRUs have been studied in some literature [9], [10], [11], [12], [13]. By using the multi-load IPT system, the number of power inverters can be reduced; the power density increases [14]. In [9], an IPT system with two layers of primary coils is implemented for desktop peripherals, such as a mouse, keyboard, and loudspeaker at every position on the table.…”

Section: Introductionmentioning

confidence: 99%

A Load-Independent Fission-Type Inductive Power Transfer System for 3D Reconfigurable IoT Array

et al. 2023

View full text Add to dashboard Cite

In recent years, the number of electronic devices and appliances that support wireless charging has rapidly increased, owing to the research and development breakthroughs in inductive power transfer (IPT) technology. The existing wireless charging protocols, such as Qi and AirFuel, support only a few devices to be charged simultaneously. They cannot be directly utilized to construct a complex IPT network. This article introduces a reconfigurable three-dimensional (3D) IPT system based on series-parallel (SP) compensation for wirelessly powering multiple adjacent cubic Internet of Things (IoT) devices. These cubes can be configured into different 3D array combinations according to the application demands. After the 3D cube array is formed, a self-detection mechanism runs to turn off the uncoupled coils, such that to maximize the power transmission efficiency of the entire system. These cubes serve as not only IoT loads but also wireless power relays. In this way, the number of loads is not limited by the size of a single transmission coil. In addition, it maintains a constant drive voltage to each load device, regardless of the load variations in local or adjacent cubes. The constant voltage design eases local power management. A prototyped IPT cube array is manufactured and tested to validate the proposed idea. This fission-type IPT system makes a valuable exploration of the 3D IPT technology toward future ubiquitous and reconfigurable IoT arrays.INDEX TERMS Inductive power transfer, Internet of Things, load-independent system, reconfigurable 3D array, wireless power relay.

show abstract

Section: Introductionmentioning

confidence: 99%

A Load-Independent Fission-Type Inductive Power Transfer System for 3D Reconfigurable IoT Array

et al. 2023

View full text Add to dashboard Cite

show abstract

“…3,4 Since no electric wires are required, this technology has the advantages of flexibility, convenience, and safety. 5 Nowadays, it has shown its great potential in charging portable electronic products, 6,7 biomedical devices, [8][9][10] electric vehicles, [11][12][13] and underwater charging. 14 However, it is reported that the power transfer efficiency of the WPT system will drop dramatically when the charging distance increases.…”

Section: Introductionmentioning

confidence: 99%

“…The magnetic coupling resonance WPT theory is first proposed in 2007, which lays the foundation for the research of WPT in various fields 3,4 . Since no electric wires are required, this technology has the advantages of flexibility, convenience, and safety 5 . Nowadays, it has shown its great potential in charging portable electronic products, 6,7 biomedical devices, 8–10 electric vehicles, 11–13 and underwater charging 14 .…”

Section: Introductionmentioning

confidence: 99%

Design of new metamaterial with negative permeability for efficient wireless power transfer

Wang,

Shi

et al. 2023

Circuit Theory & Apps

View full text Add to dashboard Cite

SummaryTo solve the problem that the efficiency of a wireless power transfer system decreases with increasing transmission distance, metamaterial (MTM) has offered an effective solution. In this paper, a novel compact MTM with negative permeability is designed to improve the transfer efficiency of wireless power transfer at the operating frequency of 13.56 MHz. By placing the MTM slab at different positions between coils, the transmission coefficient of the wireless power transfer system with one MTM slab is calculated. Also, the impact of transmission distance is studied. Based on the two‐port network method, the transfer efficiency of wireless power transfer is respectively calculated for the system with one MTM slab and with two MTM slabs. The results demonstrate that transfer efficiency at the transmission distance of 150, 200, and 250 mm are, respectively, 82.4%, 67.8%, and 47.3% when one MTM slab is introduced. For the system with two MTM slabs, the corresponding transfer efficiency is 84.9%, 77.3%, and 66.1% separately. Compared with the system without MTM, it is found that there is a large improvement in transfer efficiency especially when two MTM slabs are positioned between coils at the transmission distance of 250 mm. The magnetic field distribution of the system with one or two MTM slabs introduced is investigated. The results show that magnetic coupling between coils is strengthened, which is favorable for transfer efficiency enhancement.

show abstract

“…In terms of the design target and performance, the WPT system with our proposed coil structure is compared with several existing multi-Rx WPT systems in Table 1. With the target of multi-Rx charging, using the traditional spiral-typebased coils always results in a rapid increase in either Tx size [20], [27] or the amount of Tx coils [21], due to their weak coupling at misaligned positions. Combining the coils in series or parallel to use one common converter and tuning circuit [20] reduces the charging flexibility, more specifically, it creates blind zones where the Rx could not get power.…”

Section: Introductionmentioning

confidence: 99%

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.

View full text Add to dashboard Cite

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.

show abstract

Single-Transmitter Multiple-Pickup Wireless Power Transfer: Advantages, Challenges, and Corresponding Technical Solutions

Cited by 22 publications

References 47 publications

A Load-Independent Fission-Type Inductive Power Transfer System for 3D Reconfigurable IoT Array

A Load-Independent Fission-Type Inductive Power Transfer System for 3D Reconfigurable IoT Array

Design of new metamaterial with negative permeability for efficient wireless power transfer

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

Contact Info

Product

Resources

About