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Affiliation |
Engineering educational research section Electrical and Electronic System Program |
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Title |
Assistant Professor |
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Related SDGs |
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HIRATA Takuya
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Papers 【 display / non-display 】
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Optimal Wireless Power Transfer Circuit without a Capacitor on the Secondary Side Reviewed
Sabriansyah Rizqika Akbar, Eko Setiawan, Takuya Hirata, Ichijo Hodaka
Energies 16 ( 6 ) 2922 - 2922 2023.3
Publishing type：Research paper (scientific journal) Publisher：MDPI AG
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 Reviewed
Takuto Nakamura, Takuya Hirata, Eko Setiawan, Ichijo Hodaka
International Journal of Circuits, Systems and Signal Processing 16 1027 - 1034 2022
Publishing type：Research paper (scientific journal)
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 Reviewed
Sabriansyah Akbar, Eko Setiawan, Takuya Hirata, Kazuya Yamaguchi, Ichijo Hodaka
ACM International Conference Proceeding Series 38 - 43 2021.9
Language：English Publishing type：Research paper (scientific journal) Publisher：Association for Computing Machinery
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.
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Development of Ladder Diagram Software for Learning Programmable Logic Controllers with Arduino Reviewed
Takuya Hirata, Yoshihiro Yoshia
JOURNAL OF POLYTECNHIC SCIENCE 34 ( 1 ) 149 - 155 2018.3
Publishing type：Research paper (conference, symposium, etc.)
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Power efficiency improvement of wireless power transfer using magnetic material Reviewed
Shigefumi Morita, Takuya Hirata, Eko Setiawan, Ichijo Hodaka
Proceedings of 2017 2nd International Conference on Frontiers of Sensors Technologies, ICFST 2017 2017-January 304 - 307 2017.12
Language：English Publishing type：Research paper (international conference proceedings) Publisher：Institute of Electrical and Electronics Engineers Inc.
Efficiency improvement of wireless power transfer system is studied using ferrite bars with keeping distance of electric power transmission. Experiments are performed to decide better installation of ferrite bars for improving efficiency
there are many possibilities how and where to install them. We conducted several experiments and devised a method of installing ferrite bar with high effect on WPT. Each result is compared with the case of no ferrite bar system. The result of experiments shows using ferrite bars is practical and cost effective. Some suggestion is given to drive wireless power transfer system with lower frequency, which is also noteworthy about the limitation of available power source.
Presentations 【 display / non-display 】
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On Recognizing Hand-Drawn Electrical Circuit Diagram
Marin Takemoto, Takuya Hirata
The Conference Program of the 2024 （75th） Chugoku-branch Joint Convention of Institutes of Electrical and Information Engineers 2024.10.26
Event date： 2024.10.26
Language：Japanese Presentation type：Oral presentation (general)
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On hidden malfunction of photovoltaic module that is over 20 years passed
Ryuichi Michida, Yuta Okamura, Yusuke Nosaka, Takuya Hirata, Masayuki Fujii, Ikuo Nanno, Toshiyuki Hamada, Shinichiro Oke, Norio Ishikura
2020.10.24
Event date： 2020.10.24
Presentation type：Oral presentation (general)
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Experimental consideration on collection method of micro water droplets in cloud by electrostatic force
Hyogo Matsumura, Akira Nishiyori, Yuma Kunimoto, Takuya Hirata
2020.10.24
Event date： 2020.10.24
Presentation type：Oral presentation (general)
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太陽電池モジュールごとのI-Vカーブ計測装置の開発
道田竜一, 平田拓也, 藤井雅之
2019年度（第70回）電気・情報関連学会中国支部連合大会 2019.10.26
Event date： 2019.10.26
Language：Japanese Presentation type：Oral presentation (general)