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工学教育研究部 工学科電気電子システムプログラム担当 |
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Ardhenta L., Hodaka I., Hirata T.
AEU International Journal of Electronics and Communications 206 2026年2月
掲載種別：研究論文（学術雑誌） 出版者・発行元：AEU International Journal of Electronics and Communications
The coupling coefficient as well as the operating frequency increases or decreases the load power in a wireless power transfer system. The parameter space of coupling coefficient and operating frequency is divided into over-, critically-, and under-coupled regions. The load power at over- and under- coupled regions drops from the critically-coupled region where the power is ideally maximized. This situation for series–series topology has been clarified in the conventional studies. In this paper, the critically-coupled region or critical coupling coefficient for series-parallel and parallel-series topologies is revealed in a mathematically form. The results of this paper suggest a selection of topology to improve load power over longer distance in wireless power transfer.
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A cooperative control of wireless power transfer system using two transmitters 査読あり
Hirata T., Hodaka I., Ardhenta L.
Aims Electronics and Electrical Engineering 10 ( 1 ) 129 - 149 2026年
掲載種別：研究論文（学術雑誌） 出版者・発行元：Aims Electronics and Electrical Engineering
A wireless power transfer system with a single transmitter fed by a voltage source and a single receiver with a load is widely studied to increase load power. A system with two transmitters is also studied, especially by controlling currents through transmitter coils to maximize load power, which means current sources to drive transmitter coils are assumed instead of the voltage source. This paper presents a method for adjusting voltage amplitude and phase of each voltage source embedded in two transmitters to maximize load power. The maximized load power is also presented in an explicit form based on circuit constants of the system. As a result, advantages of the two transmitters system over the single transmitter system are revealed from the perspective of efficient power delivery.
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Optimal Wireless Power Transfer Circuit without a Capacitor on the Secondary Side 査読あり
Akbar S.R., Setiawan E., Hirata T., Hodaka I.
Energies 16 ( 6 ) 2922 - 2922 2023年3月
掲載種別：研究論文（学術雑誌） 出版者・発行元：Energies
This study proposes an approach to obtain maximum power via wireless power transfer using a single primary-side capacitor. It is shown that higher power is achieved when compared to the common wireless power transfer circuit under resonance with dual (primary- and secondary-side) capacitors. This approach is divided into three phases. By choosing the capacitor and frequency as freely assignable variables, we symbolically obtain a formula that allows us to determine the optimized capacitance and frequency for maximum power. To verify our method, we used a numerical analysis and compared it with an electronic circuit simulation. The symbolic formula is able to maintain maximum power despite changes in load or in the coupling coefficients.
DOI： 10.3390/en16062922
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A Practical Method for Estimating Mutual Inductance in Wireless Power Transmission System 査読あり
Nakamura T., Hirata T., Setiawan E., Hodaka I.
International Journal of Circuits, Systems and Signal Processing 16 1027 - 1034 2022年
掲載種別：研究論文（学術雑誌） 出版者・発行元：International Journal of Circuits, Systems and Signal Processing
This paper proposes a practical method for estimating mutual inductance in wireless power transmission system based on the principle of electromagnetic induction. Conventional estimation methods utilize a voltage, current, and phase of current in transmitter side, while our method requires only an amplitude of the voltage and current in transmitter side. Our method is designed so that the mutual inductance can be estimated under challenging situation which there is a measurement noise. Numerical simulations show that if the system has a small mutual inductance, a relative error and standard derivation of estimated mutual inductance tend to become larger. However, it will be shown that these factors can be improved to make a voltage of voltage source in the system high.
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The Frequency Response and Steady-State analysis on Wireless Power Transfer using Square Wave Input 査読あり
Akbar S., Setiawan E., Hirata T., Yamaguchi K., Hodaka I.
ACM International Conference Proceeding Series 38 - 43 2021年9月
記述言語：英語 掲載種別：研究論文（学術雑誌） 出版者・発行元：ACM International Conference Proceeding Series
Finding optimal frequency for the voltage source is important in Wireless Power Transfer (WPT) since it can make the system deliver high power to the receiver. Therefore, it is essential to visualize and analyze the frequency peak locations to ensure the system can use the correct frequency. This paper proposes a model to obtain a set of peaks that lies in some frequency range in a WPT system using square wave input. Thus, using this model, alternatives of peak frequency other than the global peak can be observed. Moreover, this study also proposes the steady-state function of the WPT system. The proposed model and steady-state analysis are compared with the experimental results and Simulation Program with Integrated Circuit Emphasis (SPICE). The comparison verified that the proposed model illustrates the steady-state response and shows the set of peak operating frequency.
講演・口頭発表等 【 表示 ／ 非表示 】
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ワイヤレス給電の電力最大化を目的とするオンライン周波数調整法
平田 拓也, 穂高 一条
第44回 計測自動制御学会九州支部 学術講演会 2025年11月29日
開催年月日： 2025年11月29日 - 2025年11月30日
会議種別：口頭発表（一般）
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ルンデ アルデンタ, 穂高一条, 平田拓也
無線電力伝送研究会（WPT） 2024年12月12日
開催年月日： 2024年12月12日
会議種別：口頭発表（一般）
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手描き電気回路図の認識について
竹本 茉倫, 平田 拓也
2024年度（第75回）電気・情報関連学会 中国支部連合大会 2024年10月26日
開催年月日： 2024年10月26日
記述言語：日本語 会議種別：口頭発表（一般）
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設置から20年経過した太陽電池モジュールの潜在的故障について
道田竜一, 岡村裕太, 野坂優介, 平田拓也, 藤井雅之, 南野郁夫, 濱田俊之, 桶真一郎, 石倉規雄
2020 年度 (第 71 回) 電気・情報関連学会中国支部連合大会 2020年10月24日
開催年月日： 2020年10月24日
会議種別：口頭発表（一般）
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静電気力を利用した雲を構成する微小水滴の収集方法の実験的検討
松村 彪吾, 西依 輝, 國本 優真, 平田 拓也
2020 年度 (第 71 回) 電気・情報関連学会中国支部連合大会 2020年10月24日
開催年月日： 2020年10月24日
会議種別：口頭発表（一般）