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Autonomous Resonant Frequency Tuner for a 6.78MHz Inductive Coupling Wireless Power Transfer System to Stably Maximize Repeater Current

Autonomous Resonant Frequency Tuner for a 6.78MHz Inductive Coupling Wireless Power Transfer System to Stably Maximize Repeater Current

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カテゴリ: 論文誌(論文単位)

グループ名: 【D】産業応用部門(英文)

発行日: 2023/03/01

タイトル(英語): Autonomous Resonant Frequency Tuner for a 6.78MHz Inductive Coupling Wireless Power Transfer System to Stably Maximize Repeater Current

著者名: Akihiro Konishi (Graduate School of Natural Science and Technology, Okayama University), Kazuhiro Umetani (Graduate School of Natural Science and Technology, Okayama University), Masataka Ishihara (Graduate School of Natural Science and Technology, Okayam

著者名(英語): Akihiro Konishi (Graduate School of Natural Science and Technology, Okayama University), Kazuhiro Umetani (Graduate School of Natural Science and Technology, Okayama University), Masataka Ishihara (Graduate School of Natural Science and Technology, Okayama University), Eiji Hiraki (Graduate School of Natural Science and Technology, Okayama University)

キーワード: autonomous control,inductive coupling,repeater,resonant frequency,wireless power transformer

要約(英語): Recently, the resonant inductive coupling wireless power transfer (RIC-WPT) technique is being widely used to charge small IoT devices dispersed in a wide area, e. g., an office desk and warehouse rack. In this application, the repeater is utilized to expand the chargeable area without an additional AC power source. The repeater comprises a LC resonator commonly with a high-quality factor to induce large current in the repeater coil. However, this causes the problem that the repeater performance is highly susceptible to the variation in its resonant frequency due to the manufacturing tolerance of coil inductance and resonant capacitance as well as the variation of the magnetic coupling between the transmitter and repeater coils. To solve this problem, a previous study has proposed a concept of the autonomous resonant frequency tuning circuit to stably maximize repeater coil current, although this study implemented a part of this control system as a practical circuit. This paper aims to develop a complete autonomous resonant frequency tuning circuit that implements the aforementioned concept. The proposed circuit adjusts the resonant frequencies of the transmitter and repeater by utilizing the Automatic Tuning Assist Circuits. These frequencies are optimized using the infrared wireless signal communication from the transmitter to the repeater. Along with the operating principle of the proposed circuit, this study presents detailed circuit design as well as the experimental results, which verified the stable autonomous maximization of the repeater coil current against the variation in the resonant frequency of the repeater resonator.

本誌: IEEJ Journal of Industry Applications Vol.12 No.2 (2023) Special Issue on “Motion Control and its Related Technologies”

本誌掲載ページ: 215-227 p

原稿種別: 論文/英語

電子版へのリンク: https://www.jstage.jst.go.jp/article/ieejjia/12/2/12_22010814/_article/-char/ja/

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