Selective Wireless Power Transfer Using Magnetic Field Editing

Tian, Xiaoyang; Chau, K. T.; Liu, Wei; Lee, Christopher

doi:10.1109/tpel.2020.3017000

Cited by 23 publications

(6 citation statements)

References 23 publications

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“…It has already been proved that using the traditional resonant coupler with large coils is not efficient or economic enough when the WPT system is applied for multiple users and a large powering area [15]. Instead, a multi-input system with a transmitter matrix of small coils brings the possibility of optimized control with more degrees of freedom.…”

Section: Demand-customized Current Control Algorithmmentioning

confidence: 99%

“…Although with the flexibility provided by the weighting vector, the procedure may also fail to reach the absolute value of the intended output voltage for each intended point. Thus, a scaler will be needed to further correct the output voltage, as shown in (15):…”

Section: ( )mentioning

confidence: 99%

“…The output voltage of every user can be flexibly adjusted so that the output power of each receiver can be controlled based on practical requirements. However, for the application scenario with a large powering area and multiple users, the energy security problem is another important issue [14][15]. Since the lack of a fixed charging routine like the traditional plug-ins, the whole powering area might be opened to arbitrary users and the energy can be easily stolen by unauthorized devices.…”

Section: Introductionmentioning

confidence: 99%

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Design and Analysis of Demand-Customized Selective Wireless Power Transfer System

Tian

Chau

Hua

et al. 2022

IEEE Trans. Ind. Electron.

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A demand-customized selective wireless power transfer (WPT) system is proposed in this paper. Multiple receivers can be recognized based on their positions and the magnetic field in the powering area can be controlled and regulated accordingly. For authorized receivers, the system can simultaneously deliver power to satisfy different output requirements for different electrical appliances, while for unauthorized ones, they can be shut down independently for energy security, even when they are also in the powering area. Compared to the traditional calculation models for multi-input multi-output (MIMO) systems, the proposed current control algorithm uses a piecewise optimization procedure to simplify the iteration and improve control flexibility. Hybrid-frequency pacing (HFP) is adopted as the control strategy to further reduce the output fluctuation and raise the system efficiency. An experimental prototype with a 3 × 3 transmitter matrix is established. The system can successfully power two receivers with the same sizes for four different power requirement scenarios, which validates the selectivity and the controllability of the proposed system.

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Section: Demand-customized Current Control Algorithmmentioning

confidence: 99%

Section: ( )mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Design and Analysis of Demand-Customized Selective Wireless Power Transfer System

Tian

Chau

Hua

et al. 2022

IEEE Trans. Ind. Electron.

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“…Therefore, no extra communication system will be needed from the secondary side. Another critical issue is that the calculated input currents should always be in-phase or opposite-phase for more efficient operation [34], while in SS-type multi-input WPT systems, the mutual inductances between the transmitter coils will cause the undesired phase shifting of the input currents. This problem can be neglected when the mutual inductance between the transmitter coils is weak enough.…”

Section: Optimal Current Algorithmmentioning

confidence: 99%

Design and Analysis of Optimal Current Vector for HTS-Based Multi-Input Wireless Power Transfer Systems

2022

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This paper presents a newly-designed optimal current algorithm for high-temperature superconductor (HTS)-based multi-input wireless power transfer (WPT) systems. In this way, both high controllability and lower AC losses can be achieved in the proposed systems, and they are especially superior for long-range and long-time operations. Simplified AC loss modeling for HTS windings is developed for the designed transmitter coils. The accordant optimal current vector is derived and analyzed in order to achieve the highest output power and the lowest primary AC losses. With the proper current control of multiple transmitters and the use of a designed HTS coupler, the system controllability can be greatly improved compared with conventional WPT systems. Based on the information on the impedance characteristics on the primary side, the magnetic field generated by different transmitters can be maximized at the target position. Thus, the maximum output power tracking can be realized with a relatively long transmission distance and a low coupling coefficient. Both active and passive solutions are designed and presented to deal with the cross-coupling issue in multi-input WPT systems. For numerical validation, a practical prototype of the HTS couplers is fabricated. An experimental platform is established with a liquid nitrogen cooling system. The test results further validate the feasibility and the high controllability of the proposed system.

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“…Spatial decoupling can simply be attained by avoiding common electromagnetic spaces among unrelated transmitters and receivers to avert interference, but is likely impractical for mutable multiple access. Electromagnetic field cancellations such as the magnetic field editing [40], and Halbach winding arrangement presented in [41] can be used to create regions in space where magnetic fields do not interfere, enabling simultaneous operation of different TX-RX pairs. However, computation is needed for every configuration, and increasing computational complexity with larger numbers of TX and RX prevents these particular orthogonal methods from scaling well.…”

Section: A Current State Of the Artmentioning

confidence: 99%

A Framework for Code Division Multiple Access Wireless Power Transfer

Sarin¹,

Avestruz

2021

IEEE Access

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The availability of energy is one of the major hindrances to unlocking the massive potential of electronic devices. Powering a highly connected network of devices requires multiple access and a wireless power transfer (WPT) solution that is scalable and capable of maintaining a constant power flow regardless of reconfiguration (mutability) and electromagnetic environment (power flow selectivity). In this paper, we present a framework for the implementation of code division multiple access wireless power transfer (CDMA-WPT) for enabling WPT among multiple transmitters and multiple receivers simultaneously. CDMA-WPT maintains power flow selectivity and is easily scalable. An inverter/rectifier topology is presented for the hardware implementation of CDMA-WPT. A design process for practical co-design of high-performance hardware and obtaining a code set is also presented. We demonstrate the hardware implementation of CDMA-WPT using two transmitters and two receivers maintaining a nearly constant 5 W operation with nearly 75 % dc-dc efficiency, and four transmitters and four receivers maintaining a constant 4 W operating with greater than 70 % dc-dc efficiency. . This paper is accompanied by a video hardware demonstration in real-time the difference between using orthogonal codes in CDMA versus conventional single-frequency WPT using 4 transmitter-receiver pairs; conventional single-frequency WPT shows up to a 100 % deviation from the intended transfer power as opposed to 8.1 % for orthogonal codes in CDMA.INDEX TERMS Wireless power transfer (WPT), code division multiple access (CDMA), current-mode class-D (CMCD), internet of things (IoT), power amplifier, high-efficiency, resonant converter.

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Selective Wireless Power Transfer Using Magnetic Field Editing

Cited by 23 publications

References 23 publications

Design and Analysis of Demand-Customized Selective Wireless Power Transfer System

Design and Analysis of Demand-Customized Selective Wireless Power Transfer System

Design and Analysis of Optimal Current Vector for HTS-Based Multi-Input Wireless Power Transfer Systems

A Framework for Code Division Multiple Access Wireless Power Transfer

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