Design of Magnetic Structure for Omnidirectional Wireless Power Transfer

Cha, Hwa-Rang; Park, Kwang-Rock; Kim, Tae-Jin; Kim, Rae-Young

doi:10.1109/tpel.2021.3055863

Cited by 25 publications

(4 citation statements)

References 39 publications

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“…P in is the input power, P out is output power, and η is transmission efficiency. Equation (8) shows the M affects the transmission performance dynamically. Therefore, we need to establish the motion equation of three kinds of mutual inductance, so that the paper simulates the mutual inductance change when the coil is moving, and the paper takes the X rotation as an example.…”

Section: Design and Analysis Of The Circuit For The C2dd Rxmentioning

confidence: 99%

“…[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%

“…WPT has unique advantages when applied in electric vehicle, consumer electronics, and implantable medical devices 1–3 . From the development trend of the research field, the omnidirectional WPT is used to overcome the limitations of unidirectional WPT 4–9 . In practice, most WPT systems require Rx to be placed in a reception area.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Design and Analysis Of The Circuit For The C2dd Rxmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

C2DD—An omnidirectional receiver based on single‐coil transmitter

Tian,

Guo,

Chen

et al. 2023

Circuit Theory & Apps

View full text Add to dashboard Cite

show abstract

“…However, the Rx angular misalignment has been a significant challenge for a planar Tx structure when the energies flow in one direction. In [7], a cubic transmitter was proposed for an omnidirectional WPT. Meanwhile, in [8], the authors optimized a magnetic structure was to obtain a uniform power distribution and improve the PTE.…”

Section: Introductionmentioning

confidence: 99%

Dual-Band Free-Positioning Transmitting Coil for Multiple-Receiver Wireless Power Transfer

Le-Huu

Seo

2021

IEEE Access

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In recent years, the requirement for a compact wireless power transfer (WPT) system that can supply power to multiple devices in various practical usage scenarios has been attracted many researchers. The receiver (Rx) misalignment problem is contributory to the power transfer efficiency (PTE) degradation. Moreover, in a multiple-output WPT system, the overall system efficiency is also affected by cross-coupling between receivers. This paper proposes a dual-band free-positioning transmitting coil (FPDB-Tx) for multiple-receiver WPT. A three-dimensional Tx structure is modeled by investigating the current direction on each coil loop to adapt the Rx angular and axial misalignment. The Tx configuration is designed following a wireless charging box concept, where multiple Rx devices can receive energy freely without a null efficiency point. The mutual inductance is examined by a mathematical method in various Rx orientations to verify the free-positioning characteristic. Furthermore, an equivalent circuit model of the WPT system is theoretically analyzed to obtain dual operating frequency bands and then maximized the PTE. The experimental results show that the proposed WPT system achieves a stable PTE in various Rx positions. Especially, the WPT system has a maximum PTE of 97.27% and 91% at 6.78 MHz and 13.56MHz, respectively.INDEX TERMS wireless power transfer, free-positioning WPT, multiple-receiver WPT, dual-band WPT, mutual coupling, impedance matching network.

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A multi‐receiver adaptive design of variable magnetic coupled structure for omnidirectional WPT system

Li,

Zhang,

Dai

et al. 2024

Circuit Theory & Apps

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SummaryOmnidirectional Wireless Power Transfer (OWPT) system can provide power to multiple loads in space. The different loads have different requirements for current and power levels under various operating conditions. This paper proposes a Variable Receiving Coil (VRC) structure and its control strategy. Active regulation of the output current is achieved by adjusting the geometric size of the receiving coil. Meets the power supply needs of equipment in different scenarios. This design allows the effective value of the VRC current to remain stable within the range of 1.01–1.62A (transmission distance of 22–27 cm). By adjusting the geometric transformation state of the VRC, different output currents can be obtained under fixed positions, loads, and input voltages. The designed receiver can meet the differential current requirements of multiple spatial loads, and is insensitive to factors such as load, transmission distance, and rotation angle. This system can reduce the design complexity of charging and power supply systems and effectively promote the application of Wireless Power Transfer (WPT) in the field of Internet of Things devices.

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Design of Magnetic Structure for Omnidirectional Wireless Power Transfer

Cited by 25 publications

References 39 publications

C2DD—An omnidirectional receiver based on single‐coil transmitter

C2DD—An omnidirectional receiver based on single‐coil transmitter

Dual-Band Free-Positioning Transmitting Coil for Multiple-Receiver Wireless Power Transfer

A multi‐receiver adaptive design of variable magnetic coupled structure for omnidirectional WPT system

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