論文 - 穂高 一条
-
Optimal Wireless Power Transfer Circuit without a Capacitor on the Secondary Side 査読あり 国際共著
Sabriansyah Rizqika Akbar, Eko Setiawan, Takuya Hirata, Ichijo Hodaka
Energies 16 ( 6 ) 2023年3月
担当区分:責任著者 掲載種別:研究論文(学術雑誌)
-
A Practical Method for Estimating Mutual Inductance in Wireless Power Transmission System 査読あり 国際共著
Takuto Nakamura, Takuya Hirata, Eko Setiawan, Ichijo Hodaka
International Journal of Circuits, Systems and Signal Processing 16 1027 - 1034 2022年6月
担当区分:最終著者 記述言語:英語 掲載種別:研究論文(学術雑誌)
-
The Frequency Response and Steady-State Analysis on Wireless Power Transfer Using Square Wave Input 査読あり
Sabriansyah Rizqika Akbar; Eko Setiawan; Takuya Hirata; Kazuya Yamaguchi; Ichijo Hodaka
2021 International Conference on Sustainable Information Engineering and Technology (SIET) 2021年9月
記述言語:英語 掲載種別:研究論文(国際会議プロシーディングス)
-
A Design Approach to Wireless High-Power Transfer to Multiple Receivers with Asymmetric Circuit 査読あり
Sabriansyah Rizqika Akbar, Ichijo Hodaka
international journal of circuits, systems and signal processing 15 125 - 134 2021年2月
記述言語:英語 掲載種別:研究論文(学術雑誌)
-
A fast spotting strategy of optimal frequency in wireless power transfer 査読あり
Akbar S.R., Hodaka I.
International Journal of Electrical and Electronic Engineering and Telecommunications 9 ( 4 ) 242 - 246 2020年7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:International Journal of Electrical and Electronic Engineering and Telecommunications
© 2020 Int. J. Elec. & Elecn. Eng. & Telcomm. One of the most common questions in the Wireless Power Transfer (WPT) system is how to transfer much power over coils driven by the AC power source. This paper concerns how to determine the frequency of AC power source optimal to maximum WPT. Although it is theoretically possible to determine the optimal frequency by wide range frequency sweep, it is practically important to spot it in a few trials of frequency. This paper proposes a frequency spotting strategy using a square wave input power signal. The strategy avoids a long time-consuming sweeping process with knowledge of response by square wave input. The Automatic Multiscale-based Peak Detection (AMPD) algorithm is applied to select the initial peak finding on every data sample increment iteration to further analysis to find the set of peak patterns by calculating error parameters.
-
A novel nonlinear control of boost converter using CCM phase plane 査読あり
Setiawan E., Hodaka I.
International Journal of Electrical and Computer Engineering 8 ( 6 ) 4282 - 4289 2018年12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:International Journal of Electrical and Computer Engineering
© 2018 Institute of Advanced Engineering and Science. All rights reserved. Boost converter is one of fundamental DC-DC converters and used to deliver electric power with boosted voltage in many electrical systems. Several control strategies have been applied to control a boost converter delivering a constant output voltage. Generally, boost converter works in two modes; one is called a Continuous Conduction Mode (CCM). Many researches use CCM model in the controller design, but they never ensure that the controller always works in CCM. This paper proposes novel nonlinear controller of boost converter designed using the modification of flow in phase plane. The proposed controller guarantees that the boost converter works only in CCM region. The simulation result confirms that our proposed controller brings the state variables from any initial point to a desired operating point successfully. copy; 2018 Institute of Advanced Engineering and Science.
-
An automatic pressure control method to continuous hydrogen generation system 査読あり
Yu Cherry Aung, Ichijo Hodaka
2018 Joint International Conference on Science, Technology and Innovation, Mandalay with Japan University & Company Research Group cooperated by IEEE 2018年10月
記述言語:英語 掲載種別:研究論文(国際会議プロシーディングス)
-
Power efficiency improvement of wireless power transfer using magnetic material 査読あり
Morita S., Hirata T., Setiawan E., Hodaka I.
Proceedings of 2017 2nd International Conference on Frontiers of Sensors Technologies, ICFST 2017 2017-January 304 - 307 2017年12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:Proceedings of 2017 2nd International Conference on Frontiers of Sensors Technologies, ICFST 2017
© 2017 IEEE. 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.
-
Accurate Symbolic Steady State Modeling of Buck Converter 査読あり
Eko Setiawan, Takuya Hirata, Ichijo Hodaka
International Journal of Electrical and Computer Engineering 7 ( 5 ) 2374 - 2381 2017年10月
記述言語:英語 掲載種別:研究論文(学術雑誌)
-
Embedded System Based on PWM Control of Hydrogen Generator with SEPIC Converter 査読あり
Cheikh Fall, Eko Setiawan, M.Afnan Habibi, Ichijo Hodaka
AIP Conference Proceedings 2017年8月
記述言語:英語 掲載種別:研究論文(国際会議プロシーディングス)
DOI: 10.1063/1.5003501
-
The use of mathematics and electric circuit simulator software in the learning process of wireless power transfer for electrical engineering students 査読あり
M.Afnan Habibi,Cheikh Fall, Eko Setiawan, Ichijo Hodaka
AIP Conference Proceedings 2017年8月
記述言語:英語 掲載種別:研究論文(国際会議プロシーディングス)
DOI: 10.1063/1.5003500
-
Top-down Approach in Control Engineering Education: Hydrogen Generation Case 査読あり
Eko Setiawan, M.Afnan Habibi,Cheikh Fall, Ichijo Hodaka
AIP Conference Proceedings 2017年8月
記述言語:英語 掲載種別:研究論文(国際会議プロシーディングス)
DOI: 10.1063/1.5003499
-
Different Frequencies between Power and Efficiency in Wireless Power Transfer
Muhammad Afnan, Habibi, Hodaka, Ichijo
Memoirs of Faculty of Engineering, University of Miyazaki 46 31 - 34 2017年7月
記述言語:英語 掲載種別:研究論文(大学,研究機関等紀要)
-
Steady State Symbolic Analysis of Buck Converter using Fourier series 査読あり
Eko Setiawan, Takuya Hirata, Ichijo Hodaka
2017 2nd International Conference on Frontiers of Sensors Technologies (ICFST) 2017年2月
記述言語:英語 掲載種別:研究論文(国際会議プロシーディングス)
-
A criterion on existence and uniqueness of behavior in electric circuit 査読あり
Hirata T., Setiawan E., Yamaguchi K., Hodaka I.
International Journal of Electrical and Computer Engineering 6 ( 4 ) 1529 - 1533 2016年8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:International Journal of Electrical and Computer Engineering
Copyright © 2016 Institute of Advanced Engineering and Science. All rights reserved. Behavior of electric circuits can be observed by solving circuit equations symbolically as well as numerically. In general, symbolic computation for circuits with certain number of circuit elements needs much more time than numerical computation. It is reasonable to check the existence and uniqueness of the solution to circuit equations beforehand in order to avoid computation for the case of no solution. Indeed, some circuits have no solution; in that case, one should notice it and avoid to wait meaningless computation. This paper proposes a new theorem to check whether given circuit equations have a solution and their voltages and currents of all circuit elements are uniquely determined or not. The theorem is suitable for developing a computer algorithm and helps quick symbolic computation for electric circuits.
-
熱電発電システムにおける開放電圧を用いた最大出力点の探索法 査読あり
奥将俊, 石津智子, 田島大輔, 迫田達也, 林則行, 穂高一条
日本太陽エネルギー学会誌 42 ( 4 ) 49 - 55 2016年7月
記述言語:英語 掲載種別:研究論文(学術雑誌)
-
Using square wave input for wireless power transfer 査読あり
Yamaguchi K., Hirata T., Hodaka I.
International Journal of Electrical and Computer Engineering 6 ( 1 ) 431 - 437 2016年2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:International Journal of Electrical and Computer Engineering
Copyright © 2016 Institute of Advanced Engineering and Science. All rights reserved. A wireless power transfer (WPT) circuit is composed of a transmitting circuit with an AC power supply and a receiving circuit with a load, and the circuits are wirelessly connected each other. Then a designer chooses the wave form of the AC power supply. Many papers about WPT adopt a sinusoidal wave as the input. The frequency of the sinusoidal wave is generally determined to the resonant frequency of the circuit for high power transfer. Since the number of circuit elements in the power supply to generate a square wave is much less than that of a sinusoidal wave, WPT with a square wave input should be treated. In fact, some papers adopt a square wave as the input, and adjust the frequency of the square wave to the resonant frequency of the circuit. In this paper, we examine how the frequency of a square wave input affects power and efficiency of WPT circuits, and propose a procedure how to determine the frequency of the input to improve power and efficiency. Finally we discuss which wave should be adopted as an input and how the frequency of the input should be determined, regardless of whether resonant phenomena occur or not.
-
High power wireless power transfer driven by square wave inputs 査読あり
Yamaguchi K., Hirata T., Hodaka I.
Advances in Intelligent Systems and Computing 388 341 - 346 2016年
記述言語:英語 掲載種別:研究論文(学術雑誌) 出版者・発行元:Advances in Intelligent Systems and Computing
© Springer International Publishing Switzerland 2016. A power source used in wireless power transfer generates an AC wave to transfer electric power to a load which is not connected electrically but connected electromagnetically to the power source. In this paper, the power and efficiency are compared when a sinusoidal and a square waves which are typical AC waves are applied as power source voltage outputs. The condition under which the two waves respectively transfer equivalent power with electric wires is examined to figure out the effect of different waves. Then the power and efficiency are calculated by a mathematical approach with practical values of elements on various situations. Finally, this paper explores how input waves should be chosen for ideal wireless power transfer.
-
A general method to parameter optimization for highly efficientwireless power transfer 査読あり
Yamaguchi K., Hirata T., Hodaka I.
International Journal of Electrical and Computer Engineering 6 ( 6 ) 3217 - 3221 2016年
記述言語:英語 掲載種別:研究論文(学術雑誌) 出版者・発行元:International Journal of Electrical and Computer Engineering
Copyright © 2016 Institute of Advanced Engineering and Science. All rights reserved. This paper proposes a new and general method to optimize a working frequency and a load resistance in order to realize highly efficient wireless power transfer. It should be noticed that neither resonant frequency nor matched impedance maximizes efficiency of wireless power transfer circuit, in general. This paper establishes a mathematical model of a commonly used wireless power transfer circuit, and derives a mathematical expression of circuit efficiency which involves a working frequency, a load resistance and the other parameters as symbols. This enables us to find the optimal working frequency and load resistance. The result of this paper is compared with results by a method based on resonance and impedance matching, and then clarified by a numerical example.
-
A symbolic equation modeler for electric circuits 査読あり
Hirata T., Yamaguchi K., Hodaka I.
ACM Communications in Computer Algebra 49 ( 3 ) 80 - 82 2015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 Communications in Computer Algebra
When users analyze symbolically physical phenomena, software products which partially help them write a symbolic equation to the phenomena are available. In electric engineering, there are a few software products which compute symbolically voltages and currents of electric circuits. They cover the frequency response analysis on behavior of linear time-invariant (LTI) circuits. However, they do not cover symbolic computation on the time response of circuits. This paper introduces a software product which generates a model for computing the time response of LTI circuits.