A Reticulated Planar Transmitter Using a Three-Dimensional Rotating Magnetic Field for Free-Positioning Omnidirectional Wireless Power Transfer

Feng, Tianxu; Zuo, Zhiping; Sun, Yue; Dai, Xin; Wu, Xingyang; Zhu, Lin

doi:10.1109/tpel.2022.3155251

Cited by 40 publications

(8 citation statements)

References 36 publications

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“…10(b) presents all the ac voltage waveforms in the considered Tx area, including v f 1,0 , v f 1,90 , v f 1,180 , v f 1,270 , and v f 2,0 , v f 2,90 . The Tx current i Tx11 is also given as an example, validating (5), showing that the Tx current is dependent only on the supply voltage, and thus contains both frequencies, while it is independent of the Rx-side operations.…”

Section: Experimental Waveforms and Loss Distributionmentioning

confidence: 59%

“…charging of multiple consumer electronics devices and kitchen appliances. Compared with the solutions using a single large Tx coil [4] or supply rails [5], applications of multiple small Tx coils [6], [7] are more flexible and provide possibilities of charging multiple receivers (Rxs) at the same time. In a multi-Tx system, it is easier to avoid standby losses and unwanted electromagnetic exposure by turning OFF the Tx coils in the uncoupled areas [8], [9].…”

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confidence: 99%

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Noncoherent Power Combining for Free-Positioning Wireless Power Transfer in Large Area

Liu,

Al Mahmud,

Ha-Van

et al. 2024

IEEE Trans. Ind. Electron.

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In this article, we propose a new coilenergizing method for multitransmitter (Tx) wireless power transfer (WPT) systems that enable complete freedom of receiver (Rx) positioning in a large area. The principle is based on noncoherent power combining, where multiple Tx coils are supplied in a predefined pattern by mixing two slightly different frequencies and four different phase angles. The powers delivered from Tx coils at two frequencies are then combined incoherently at the Rx side, resulting in full positional and rotational freedom for the Rx charging. The power transfer blind spots in conventional WPT systems are completely eliminated with the proposed noncoherent power combining method due to its natural robustness against cancelations. The experimental setup shows constant dc-dc power transfer efficiency around 90% for arbitrary Rx movements without any further requirements on dynamic controls of Txs or Rxs other than the simplest activation/deactivation. Index Terms-Blind spots elimination, full charging freedom, large transmitting area, noncoherent power combining, wireless power transmission (WPT). I. INTRODUCTIONE FFICIENT and uninterrupted wireless power transfer (WPT) in a large area facilitates wireless charging for a wide range of applications encompassing consumer electronics [1], kitchen appliances [2], and automated robots [3]. For example, a WPT system employing multiple transmitters (Txs) can be integrated into a table or kitchen top to enable seamless Manuscript

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Section: Experimental Waveforms and Loss Distributionmentioning

confidence: 59%

mentioning

confidence: 99%

Noncoherent Power Combining for Free-Positioning Wireless Power Transfer in Large Area

Liu,

Al Mahmud,

Ha-Van

et al. 2024

IEEE Trans. Ind. Electron.

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“…While planar omnidirectional WPT systems feature simple structures thus facilitating the fabrication and furniture integration, they do not inherently contribute to enhanced performance. For instance, the reticulated structure in [20] still exhibits weak magnetic fields in the y direction and low transfer efficiency. Similarly, the planar structure proposed in [21], which is composed of a metasurface, driver loop, and resonator, has low transfer efficiency and weak magnetic fields in the x and y directions.…”

Section: Introductionmentioning

confidence: 99%

“…(3) Previous analysis focuses on the realization of a 3-D magnetic field without optimization. This results in uneven magnetic field distribution and poor misalignment tolerance [16], [20], [23]. An optimization process to improve both the lateral and angular misalignments is imperative.…”

Section: Introductionmentioning

confidence: 99%

Design and Optimization of a Planar Omnidirectional Wireless Power Transfer System for Consumer Electronics

Yu,

Feng,

Zhu

et al. 2024

IEEE Open J. Power Electron.

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Recently, omnidirectional wireless power transfer (WPT) has gained increasing popularity due to its capability to charge in arbitrary positions and directions. However, existing solutions still face several challenges, including coupled coils, nonoptimized structure, non-uniform magnetic field, and poor misalignment tolerance. This work proposes an omnidirectional WPT system with three fully decoupled coils consisting of one square coil and two perpendicular DD coils. Comprehensive modeling and Pareto optimization for the transmitter coil structure are conducted for improved tolerance to both lateral and angular misalignment. Experimental results are provided to validate the system performance in terms of the output voltage and efficiency under different lateral and angular misalignments. With a 12 V input, the efficiency of the system exhibits a <10% variation, ranging from 69% to 78%, with 50mm misalignment in the x and y axes and a 90-degree angular misalignment. At the same time, the output voltage remains within the range of 11.5 V to 14.5 V.

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“…11,12 To reduce the transmission performance fluctuation, the Tx magnetic field is rotated to change the TMF position by adding the control circuitry of the power flow. Based on control magnetic field method, the Tx was designed as the plane-type Tx and tubular coils Tx, [13][14][15][16] which can charge above or in Tx. Another more efficient way is to calculate the Rx position and then change the magnetic field direction to point at Rx.…”

Section: Introductionmentioning

confidence: 99%

C2DD—An omnidirectional receiver based on single‐coil transmitter

Tian,

Guo,

Chen

et al. 2023

Circuit Theory & Apps

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In this paper, the omnidirectional receiver (Rx) of wireless power transfer (WPT) system is proposed, making any transmitter (Tx) into omnidirectional Tx. The omnidirectional Rx is composed of the quadrature double‐D (DD) coils and circular coil in series (C2DD). The C2DD Rx can utilize the toroidal magnetic field (TMF) and the linear magnetic field (LMF). The paper presents the circuit diagram model of WPT system. Based on the analysis of circuit model, the smooth mutual inductance of system is responsible for stable transmission performance during C2DD Rx movement. The result of numerical calculation and magnetic field simulation verifies the omnidirectional capability of the C2DD Rx with circular Tx as an example. Experiment shows that the C2DD Rx receives power in any direction. The C2DD Rx can receive maximum transmission power of 7.1 W with maximum transmission efficiency of 59%.

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A Reticulated Planar Transmitter Using a Three-Dimensional Rotating Magnetic Field for Free-Positioning Omnidirectional Wireless Power Transfer

Cited by 40 publications

References 36 publications

Noncoherent Power Combining for Free-Positioning Wireless Power Transfer in Large Area

Noncoherent Power Combining for Free-Positioning Wireless Power Transfer in Large Area

Design and Optimization of a Planar Omnidirectional Wireless Power Transfer System for Consumer Electronics

C2DD—An omnidirectional receiver based on single‐coil transmitter

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