Design and Analysis of an Omnidirectional Dual-Band Wireless Power Transfer System

Lu, Conghui; Huang, Xiutao; Xiong, Tingting; Liu, Xiaobo; Chen, Rong; Zeng, Yingqin; Liu, Minghai

doi:10.1109/tap.2020.3037713

Cited by 26 publications

(9 citation statements)

References 33 publications

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“…Known structures are based on orthogonal coils with complex control methods, which require multiple sources and are costly [19], [20], [38], [39]. In order to simplify control circuits, some structures using different transmitter topology were proposed, however, the 2-D omnidirectional characteristic was not obtained properly in all receiving angles [21], [22], [40]. On the other hand, the cylindrical Tx coil proposed in this paper offers a completely 2-D omnidirectional WPT system with a single source.…”

Section: Sar Verification and Performance Comparisonmentioning

confidence: 99%

“…However, the generated magnetic field of this cubic Tx coil is not perfectly 2-D omnidirectional due to wire coupling at the edges of the cubic structure. Likewise, an approximately omnidirectional dualband WPT based on four-coil topology using a source loop was proposed in [22]. The source loop is designed to have two parallel coils that drive the current in the same direction, leading to very weak coupling.…”

Section: Introductionmentioning

confidence: 99%

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Cylindrical Transmitting Coil for Two-Dimensional Omnidirectional Wireless Power Transfer

Liu

Jayathurathnage

et al. 2022

IEEE Trans. Ind. Electron.

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Megahertz-range wireless power transfer has become a promising approach for increasing spatial freedom of charging. This paper proposes a cylindrical-shaped coil, which can produce the homogeneous magnetic field in a plane. The coil consists of two helical windings, which are wound to guide the current in opposite directions. A single power source is used to excite the transmitter without any current amplitude or phase control circuits. Furthermore, since the parasitic capacitance of the coil is not negligible due to the complexity of the coil shape, we develop a general equivalent model with parasitic capacitance for the analysis of complex coils. The system efficiency of the proposed omnidirectional wireless power transfer device is validated by a practical experiment. The measured DC-to-DC efficiency of approximately 72.4% and the load power of 13 W are demonstrated for the proposed wireless charging system at 6.78 MHz operating frequency. Finally, we verify that the electromagnetic exposure satisfies the safety regulations.

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Section: Sar Verification and Performance Comparisonmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Cylindrical Transmitting Coil for Two-Dimensional Omnidirectional Wireless Power Transfer

Liu

Jayathurathnage

et al. 2022

IEEE Trans. Ind. Electron.

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“…[1][2][3] From the development trend of the research field, the omnidirectional WPT is used to overcome the limitations of unidirectional WPT. [4][5][6][7][8][9] In practice, most WPT systems require Rx to be placed in a reception area. As a result, the transmission performance of the WPT system is significantly degraded when the Rx is moved out of the desired position.…”

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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“…Operating at 403 MHz in the Medical Implant Communication Service (MICS) band, the WPT link constitutes an in vitro primary loop as a transmitter and a single-turn implantable loop as a receiver. Lu et al (2021) [6] proposed a dual-band omnidirectional 3-D WPT system. The power emitted by the transmitter can be received by any receiver operating at 13.56 and 27.12 MHz located at any position.…”

Section: Introductionmentioning

confidence: 99%

Study and Optimization of Transmission Characteristics of the Magnetically Coupled Resonant Wireless Transmission System

Wen

Chen

2022

Electronics

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The topology and parameter characteristics of the wireless energy transmission system are the main factors affecting the system’s performance. A series–parallel–series–parallel (spsp) topology for magnetically coupled wireless energy transmission is proposed to address the problems of low efficiency and low output power when transmitting electrical energy in the conventional magnetically coupled topology. The spsp topology is compared with the conventional topology based on circuit theory, and the two structures are modeled, characterized, and verified in detail. Simulations and tests are performed for the transmission conditions, an improved Gray Wolf optimization algorithm is proposed, and a physical system is built. Experiments show that the spsp structure is superior near the designed circuit parameters when the network works in a resonant state. The improved Gray Wolf optimization algorithm is then used to find the optimal parameters, and the transmission efficiency reaches 90.53%, which effectively improves the transmission performance of the system. The established physical system utilizes the optimized parameters for coil structure and coil offset experiments, and the average transmission efficiency is 83.75%, with an error of 6.78% calculated by data measurement. The rationality of the proposed structure and the correctness of the simulation parameter design method are verified, and it is hoped that the proposed system and circuit structure in this paper will provide a reference for the design of a magnetically coupled wireless energy transmission system.

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Design and Analysis of an Omnidirectional Dual-Band Wireless Power Transfer System

Cited by 26 publications

References 33 publications

Cylindrical Transmitting Coil for Two-Dimensional Omnidirectional Wireless Power Transfer

Cylindrical Transmitting Coil for Two-Dimensional Omnidirectional Wireless Power Transfer

C2DD—An omnidirectional receiver based on single‐coil transmitter

Study and Optimization of Transmission Characteristics of the Magnetically Coupled Resonant Wireless Transmission System

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