Design of multi-frequency coil for capacitor-less wireless power transfer using high order self-resonance of open end coil

Furusato, Koichi; Imura, Takehiro; Hori, Yoichi

doi:10.1109/wpt.2016.7498858

Cited by 12 publications

(3 citation statements)

References 7 publications

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“…It is assumed that the entire system only has one operating frequency. For multi-frequency systems such as in [13], they can be analysed using the superposition method in addition to the methodologies proposed. As the single-frequency ac analysis is assumed, the fundamental amplitudes and phases of non-sinusoidal waveforms shall be used.…”

Section: Methodsmentioning

confidence: 99%

IPTVisual: Visualisation of the Spatial Energy Flows in Inductive Power Transfer Systems with Arbitrary Winding Shapes

Zhang

Chen

et al. 2022

WEVJ

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Mid-ranged wireless power transfer by induction or inductive power transfer (IPT), including the strong magnetic resonance method, has been widely adopted, in numerous applications where wires are restricted. The energy flow in space, of course, is invisible to engineers. The windings are often required to be irregular shapes to accommodate the industrial designs of the products, thus, a visualisation method for energy transfer paths could greatly help the design and optimization of such systems. A time-efficient methodology, including the model, analysis and plot of the three-dimensional energy flow for IPT systems, is proposed in this paper. Algorithms of fast describing arbitrarily shaped windings are proposed and the time complexities are evaluated. A software tool, IPTVisual, is developed. It takes the inputs of key coordinates of the windings, the assignments of voltage and/or current sources, any compensation capacitors and auxiliary circuits, and the required observation points to generate the 3D models of the windings and the Poynting vectors, rendered in web browsers for the most extendable compatibility. Several example scenarios have been tested and the results match with the expected operations.

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Section: Methodsmentioning

confidence: 99%

IPTVisual: Visualisation of the Spatial Energy Flows in Inductive Power Transfer Systems with Arbitrary Winding Shapes

Zhang

Chen

et al. 2022

WEVJ

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“…By using the open-end coil topology, a multi-frequency selfresonant WPT system has been presented with the resonant frequencies of 2.5 MHz and 13 MHz [13]. Besides, the parasitic capacitance of saline water filled helical coil was used to transfer the wireless power underwater [14].…”

Section: Introductionmentioning

confidence: 99%

Low-Frequency Medium Power Capacitor-Free Self-Resonant Wireless Power Transfer

Jiang

Gaona

Shen

et al. 2021

IEEE Trans. Ind. Electron.

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With the rapid development of wireless power transfer (WPT), the self-resonant WPT system without using additional compensation capacitors has attracted attention. However, most of reported self-resonant WPT systems have low power transfer (less than 100 W) and high operating frequencies at megahertz. In this paper, four multi-layer, self-resonant WPT coil pads with different dielectrics are designed and experimentally validated. The aim of this paper is to increase the power rating and decrease the operating frequency for capacitor-free WPT system compared to reported systems used in consumer electronics. Analysis of integrated compensation capacitance, inductance, and parasitic capacitance of the coil is provided. Finite Element Analysis (FEA) is used to evaluate four dielectric materials, mica, polypropylene, polyimide, and fiberglass. An experimental setup has been developed, which can achieve more than 360 W power transfer for a 120 mm air gap with an efficiency of 82% and an operating frequency of near 80 kHz.

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“…Therefore, it is necessary to inject multifrequency signals underground to harvest enough geoelectric information. In recent years, the multifrequency wireless power transfer (WPT) for multiple loads is a popular subject . A well‐designed multifrequency resonant network is very useful for the transfer efficiency and self‐adaptability of WPT.…”

Section: Introductionmentioning

confidence: 99%

Design of hybrid‐frequency current source based on multiresonance network

Zhu

Luo

Zhu

2019

IEEJ Transactions Elec Engng

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In order to overcome the low efficiency and poor resolution of single‐frequency transmitters for electromagnetic sounding and wireless power transfer (WPT), a well‐organized multifrequency resonant network is proposed to generate a synthetized current with two or more frequencies. The complete design and realization of the hybrid‐frequency current source is presented. The characteristic equation method is applied to extract the resonance frequencies from the given network. On the other hand, the nonlinear equation system about the passive elements is built and solved by the trust–region algorithm based on the expected frequencies. The multifrequency sinusoidal pulse width modulation method is first proposed to create the barcode driving signals for a full‐bridge inverter. The asynchronous modulation is recommended to reduce the harmonic components beyond the resonance frequencies, and the modulation ratios for the driving signals are adjusted at any resonance frequency so that the energy can be distributed evenly at different resonance points. The simulation results prove that almost all energy is concentrated at the resonance frequencies, and the frequency leakage is hardly seen. The resonant network and its control method is very useful to create a hybrid‐frequency current source for high‐efficiency and high‐resolution electromagnetic sounding and WPT. © 2019 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.

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Design of multi-frequency coil for capacitor-less wireless power transfer using high order self-resonance of open end coil

Cited by 12 publications

References 7 publications

IPTVisual: Visualisation of the Spatial Energy Flows in Inductive Power Transfer Systems with Arbitrary Winding Shapes

IPTVisual: Visualisation of the Spatial Energy Flows in Inductive Power Transfer Systems with Arbitrary Winding Shapes

Low-Frequency Medium Power Capacitor-Free Self-Resonant Wireless Power Transfer

Design of hybrid‐frequency current source based on multiresonance network

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