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Improvement in output power of vibration generators based on piezoelectric elements by using internal capacitor cancel control rectifier 利用内部电容抵消控制整流器提高压电元件振动发生器的输出功率
IF 0.4 4区 工程技术
Electrical Engineering in Japan Pub Date : 2023-02-05 DOI: 10.1002/eej.23415
Masataka Minami, Akito Nakagaki, Genki Hase
{"title":"Improvement in output power of vibration generators based on piezoelectric elements by using internal capacitor cancel control rectifier","authors":"Masataka Minami,&nbsp;Akito Nakagaki,&nbsp;Genki Hase","doi":"10.1002/eej.23415","DOIUrl":"https://doi.org/10.1002/eej.23415","url":null,"abstract":"<p>Recently, energy harvesting has attracted increasing attention. The present study focuses on vibration generators based on piezoelectric elements by proposing an internal capacitor cancel control (ICCC) rectifier to improve the output power. The proposed rectifier cancels the internal capacitor to improve the output power while retaining the maximum output power. Accordingly, this paper experimentally demonstrates the improvement in output power by using the ICCC rectifier compared to conventional circuits and the previous proposed circuit.</p>","PeriodicalId":50550,"journal":{"name":"Electrical Engineering in Japan","volume":"216 1","pages":""},"PeriodicalIF":0.4,"publicationDate":"2023-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"50130076","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Modeling of I-V characteristics for crystalline silicon photovoltaic modules based on a simplified equivalent circuit and a temperature correction 基于简化等效电路和温度校正的晶体硅光伏组件I-V特性建模
IF 0.4 4区 工程技术
Electrical Engineering in Japan Pub Date : 2022-11-21 DOI: 10.1002/eej.23410
Yuki Ohnishi, Yasuhito Takahashi, Koji Fujiwara, Kazuyuki Hidaka, Hiroshi Morita
{"title":"Modeling of I-V characteristics for crystalline silicon photovoltaic modules based on a simplified equivalent circuit and a temperature correction","authors":"Yuki Ohnishi,&nbsp;Yasuhito Takahashi,&nbsp;Koji Fujiwara,&nbsp;Kazuyuki Hidaka,&nbsp;Hiroshi Morita","doi":"10.1002/eej.23410","DOIUrl":"10.1002/eej.23410","url":null,"abstract":"<p>Electric power generated by photovoltaic (PV) systems is generally unstable because of uncertain meteorological conditions. Stably maintaining the supply-demand balance of power systems requires an accurate prediction of the performance of PV systems. Especially for predicting the performance of the PV systems containing modules with different electrical characteristics or installed in different angles, it is necessary to calculate the generated power of the system by combining the current-voltage (<i>I</i>-<i>V</i>) characteristics of each module in series and parallel. Therefore, an accurate method is required for estimating the <i>I</i>-<i>V</i> characteristics in various meteorological conditions. In this paper, a simple modeling method of the <i>I</i>-<i>V</i> characteristics for crystalline silicon PV modules is proposed. The <i>I</i>-<i>V</i> characteristics can be simulated in a good accuracy for practical use based on a simplified equivalent circuit of PV modules and a temperature correction of the short-circuit current, open-circuit voltage, and the current and voltage at maximum power point. The validity of the proposed method is examined by comparing simulated and measured <i>I</i>-<i>V</i> characteristics of a PV module. Furthermore, to demonstrate the effectiveness of the proposed modelling method, it was applied to simulating the power generation of a PV system containing modules installed in different angles.</p>","PeriodicalId":50550,"journal":{"name":"Electrical Engineering in Japan","volume":"215 4","pages":""},"PeriodicalIF":0.4,"publicationDate":"2022-11-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91068489","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Development of the reciprocating airflow generator for wave power generator and study on the vertical axis turbine characteristics in reciprocating airflow 波浪发电机组往复气流发生器的研制及垂直轴水轮机在往复气流中的特性研究
IF 0.4 4区 工程技术
Electrical Engineering in Japan Pub Date : 2022-10-25 DOI: 10.1002/eej.23405
Kentaro Tsuji, Mitsuhiro Shiono
{"title":"Development of the reciprocating airflow generator for wave power generator and study on the vertical axis turbine characteristics in reciprocating airflow","authors":"Kentaro Tsuji,&nbsp;Mitsuhiro Shiono","doi":"10.1002/eej.23405","DOIUrl":"10.1002/eej.23405","url":null,"abstract":"<p>Renewable energy is attracting attention as an alternative to current mainstream power generator sources. One source of renewable energy is wave energy. We devised a simulator for the OWC-type wave power generator and developed a reciprocating airflow generator is generated reciprocating airflow by using the reciprocating motion of a piston. This piston motion was achieved by converting the rotational motion of the motor into linear motion of the ball screw via gears. Furthermore, we used a vertical axis turbine with arc camber blades and studied on the turbine characteristics. Owing to the reciprocation of the piston, a substantially sinusoidal reciprocating airflow was generated in the measurement section. It was confirmed that a reciprocating airflow speed was generated for all the target values. A load characteristic test of the turbine was conducted. It was confirmed that the maximum turbine output was 1.60 W.</p>","PeriodicalId":50550,"journal":{"name":"Electrical Engineering in Japan","volume":"215 4","pages":""},"PeriodicalIF":0.4,"publicationDate":"2022-10-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89075187","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Limitation of switching frequency to improve characteristics and suppression of input current distortion for critical mode PFC 限制开关频率以改善临界模式PFC的特性和抑制输入电流畸变
IF 0.4 4区 工程技术
Electrical Engineering in Japan Pub Date : 2022-10-23 DOI: 10.1002/eej.23407
Ryuji Yamada, Ryunosuke Araumi, Keiji Wada
{"title":"Limitation of switching frequency to improve characteristics and suppression of input current distortion for critical mode PFC","authors":"Ryuji Yamada,&nbsp;Ryunosuke Araumi,&nbsp;Keiji Wada","doi":"10.1002/eej.23407","DOIUrl":"10.1002/eej.23407","url":null,"abstract":"<p>In critical mode power factor correction (PFC), the switching frequency is varied to achieve a sinusoidal input current waveform. Under certain conditions, a higher frequency increases the loss and noise. Meanwhile, the limitation of the switching frequency leads to an increase in input current distortion. This paper proposes a method to prevent an increase in distortion by compensating the pulse width at a limited frequency. Using this control method, critical mode PFC with a limited maximum switching frequency was evaluated. As a result, the total harmonic distortion of the input current was lower than that before the frequency limitation. Furthermore, the improvement in efficiency and the reduction in conducted EMI were confirmed.</p>","PeriodicalId":50550,"journal":{"name":"Electrical Engineering in Japan","volume":"215 4","pages":""},"PeriodicalIF":0.4,"publicationDate":"2022-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72518592","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Input voltage estimation method and suppression of distortion caused by DC voltage ripple for input current control of PFC PFC输入电流控制的输入电压估计方法及直流电压纹波畸变抑制
IF 0.4 4区 工程技术
Electrical Engineering in Japan Pub Date : 2022-10-21 DOI: 10.1002/eej.23406
Ryuji Yamada, Ryunosuke Araumi, Keiji Wada
{"title":"Input voltage estimation method and suppression of distortion caused by DC voltage ripple for input current control of PFC","authors":"Ryuji Yamada,&nbsp;Ryunosuke Araumi,&nbsp;Keiji Wada","doi":"10.1002/eej.23406","DOIUrl":"10.1002/eej.23406","url":null,"abstract":"<p>This paper proposes a new method for input current control of power factor correction (PFC) with continuous conduction mode (CCM), which does not require input voltage detection. As a control method that does not use input voltage detection, pulse width modulation (PWM) with the inductor current as the modulated signal is already in practical use however, this approach has limitations for the range of inductance values used. In CCM-PFC, the input rectified voltage and low-frequency component of the voltage of the switching circuit are approximately equal in the stable state as well as proportional to the PWM signal. This study uses the previous modulated signal as the estimated voltage value to generate an instantaneous current command for feedback control. In addition, a method to suppress the influence of the DC voltage ripple by changing the voltage control gain according to the value of the DC voltage was employed. From the evaluation, it was confirmed that the harmonics of the input current were suppressed within the specified range of values.</p>","PeriodicalId":50550,"journal":{"name":"Electrical Engineering in Japan","volume":"215 4","pages":""},"PeriodicalIF":0.4,"publicationDate":"2022-10-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88432755","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
MEMS Rogowski coil current sensor with spiral return coil 带有螺旋回线圈的MEMS Rogowski线圈电流传感器
IF 0.4 4区 工程技术
Electrical Engineering in Japan Pub Date : 2022-10-19 DOI: 10.1002/eej.23408
Yoshiyuki Watanabe, Mutsuto Kato, Toru Yahagi, Hiroki Murayama, Naoya Yamada, Kenichi Yoshida, Kenichi Maehara, Yusuke Fukuda, Kazuyuki Sashida, Katsuya Ikeda, Kosuke Ikeda, Toshiyuki Takemori
{"title":"MEMS Rogowski coil current sensor with spiral return coil","authors":"Yoshiyuki Watanabe,&nbsp;Mutsuto Kato,&nbsp;Toru Yahagi,&nbsp;Hiroki Murayama,&nbsp;Naoya Yamada,&nbsp;Kenichi Yoshida,&nbsp;Kenichi Maehara,&nbsp;Yusuke Fukuda,&nbsp;Kazuyuki Sashida,&nbsp;Katsuya Ikeda,&nbsp;Kosuke Ikeda,&nbsp;Toshiyuki Takemori","doi":"10.1002/eej.23408","DOIUrl":"10.1002/eej.23408","url":null,"abstract":"<p>We have developed a MEMS Rogowski coil current sensor with spiral return coil. The Rogowski coil is formed on a silicon substrate clockwise and counterclockwise from the edges, for current detection and external magnetic noise compensation (device size 10 × 10 × 0.3 mm<sup>3</sup>, spiral coil 135 turns, via diameter 100 μm). When the slew rate (<i>di</i>/<i>dt</i>) was kept constant at 10 A/μs, and the current was changed by 5 A up to 40 A, MEMS Rogowski coil could detect current linearly. When the slew rate was changed by 10 A/μs up to 100 A/μs, it was found that the MEMS Rogowski coil could detect current almost linearly following the reference sensor. Hence, external noise compensation by the return coil has been confirmed.</p>","PeriodicalId":50550,"journal":{"name":"Electrical Engineering in Japan","volume":"215 4","pages":""},"PeriodicalIF":0.4,"publicationDate":"2022-10-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78760966","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Development of a hands-free electrolarynx for obtaining a human-like voice using the LPC residual wave 利用LPC残余波获得类人声音的免提电喉器的研制
IF 0.4 4区 工程技术
Electrical Engineering in Japan Pub Date : 2022-10-18 DOI: 10.1002/eej.23409
Masaki Takeuchi, Yutaro Soejima, Jaesol Ahn, Kunhak Lee, Ken Takaki, Tohru Ifukube, Ken-Ichiro Yabu, Shinnosuke Takamichi, Masaki Sekino
{"title":"Development of a hands-free electrolarynx for obtaining a human-like voice using the LPC residual wave","authors":"Masaki Takeuchi,&nbsp;Yutaro Soejima,&nbsp;Jaesol Ahn,&nbsp;Kunhak Lee,&nbsp;Ken Takaki,&nbsp;Tohru Ifukube,&nbsp;Ken-Ichiro Yabu,&nbsp;Shinnosuke Takamichi,&nbsp;Masaki Sekino","doi":"10.1002/eej.23409","DOIUrl":"10.1002/eej.23409","url":null,"abstract":"<p>The conventional electrolarynx (EL) restores the voice of people who have lost their voice, however, its voice sounds like a robot and it occupies user's one hand. Therefore, we developed a hands-free wearable electrolarynx that improves the voice quality with the LPC residual wave as the vibration sound. Our device was able to reproduce sounds below 500 Hz, which is close to the fundamental frequency, but from 1700 Hz to 4000 Hz, the conventional EL continuously showed a frequency response closer to the spectrum of the user's vocal sound than our device. Thus, the periodic sound of the fundamental frequency band was found to be closer to human speech than individuality or sound quality.</p>","PeriodicalId":50550,"journal":{"name":"Electrical Engineering in Japan","volume":"215 4","pages":""},"PeriodicalIF":0.4,"publicationDate":"2022-10-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82603229","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Microfabrication of surface acoustic wave devices with AlN thin film deposited on half-inch quartz wafer 半英寸石英晶圆上AlN薄膜表面声波器件的微加工
IF 0.4 4区 工程技术
Electrical Engineering in Japan Pub Date : 2022-10-14 DOI: 10.1002/eej.23412
Asahi Nagano, Kanato Kitamura, Shuichi Noda, Sunao Murakami, Kohei Iguchi, Sommawan Khumpuang, Shiro Hara
{"title":"Microfabrication of surface acoustic wave devices with AlN thin film deposited on half-inch quartz wafer","authors":"Asahi Nagano,&nbsp;Kanato Kitamura,&nbsp;Shuichi Noda,&nbsp;Sunao Murakami,&nbsp;Kohei Iguchi,&nbsp;Sommawan Khumpuang,&nbsp;Shiro Hara","doi":"10.1002/eej.23412","DOIUrl":"10.1002/eej.23412","url":null,"abstract":"<p>In this paper, we have fabricated surface acoustic wave (SAW) devices with six sets of interdigital transducers (IDTs) on half-inch wafers of quartz with deposited thin films of aluminum nitride (AlN). Firstly, AlN thin films have been deposited by reactive sputtering in Ar-N<sub>2</sub> gas mixture at 400°C with the high-power impulse magnetron sputtering (HiPIMS) system which was developed for microfabrication process in the localized clean environment with half-inch wafer (Minimal Fab). After that, IDTs of Al thin films have been prepared on the AlN thin films. The X-ray diffraction (XRD) pattern of the AlN thin films shows that the AlN films have <i>c</i>-axis (002) orientation. Furthermore, the frequency responses have been measured with four paired IDTs of the SAW devices, which were selected from six sets of IDTs as an input electrode and an output electrode. These results show device properties responding to the design of the IDTs and also suggest the potential of the fabricated SAW devices as the four-paralleled frequency filter and/or sensing system.</p>","PeriodicalId":50550,"journal":{"name":"Electrical Engineering in Japan","volume":"215 4","pages":""},"PeriodicalIF":0.4,"publicationDate":"2022-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77526026","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Highly extendable passive current balancing interleaved high step-up boost converter using voltage multipliers 高度可扩展无源电流平衡交错高升压转换器使用电压乘法器
IF 0.4 4区 工程技术
Electrical Engineering in Japan Pub Date : 2022-10-13 DOI: 10.1002/eej.23411
Kakeru Koyama, Masatoshi Uno, Hiroki Inohara
{"title":"Highly extendable passive current balancing interleaved high step-up boost converter using voltage multipliers","authors":"Kakeru Koyama,&nbsp;Masatoshi Uno,&nbsp;Hiroki Inohara","doi":"10.1002/eej.23411","DOIUrl":"10.1002/eej.23411","url":null,"abstract":"<p>High step-up boost converters with large input current capacity are necessary for low-voltage renewable energy sources, such as photovoltaic panels and fuel cells. Interleaved converters are a suitable topology for low-voltage, large input current applications. Conventional interleaved converters, however, face a variety of challenges, such as the necessity of additional current control loops for active current balancing, increased voltage stress of semiconductors, and poor extendibility. In this paper, highly extendable interleaved high step-up boost converters with a passive current balancing and reduced semiconductor voltage stresses are proposed. Current capacities and step-up conversion ratios of the proposed converters can be arbitrarily enhanced by extending the number of phases and voltage multiplier (VM) stages, respectively. The experimental results of 500-W prototypes demonstrated passive current balancing, reduced semiconductor voltage stresses, and enhanced step-up conversion ratios.</p>","PeriodicalId":50550,"journal":{"name":"Electrical Engineering in Japan","volume":"215 4","pages":""},"PeriodicalIF":0.4,"publicationDate":"2022-10-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81692322","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Development of a circuit breaker system using a linear motor with opposite magnetic poles 采用反向磁极直线电机的断路器系统的研制
IF 0.4 4区 工程技术
Electrical Engineering in Japan Pub Date : 2022-09-25 DOI: 10.1002/eej.23388
Yasuaki Aoyama, Yu Hasegawa, Katsuhiko Shiraishi, Hiroaki Hashimoto, Hajime Urai, Daisuke Ebisawa
{"title":"Development of a circuit breaker system using a linear motor with opposite magnetic poles","authors":"Yasuaki Aoyama,&nbsp;Yu Hasegawa,&nbsp;Katsuhiko Shiraishi,&nbsp;Hiroaki Hashimoto,&nbsp;Hajime Urai,&nbsp;Daisuke Ebisawa","doi":"10.1002/eej.23388","DOIUrl":"10.1002/eej.23388","url":null,"abstract":"<p>The high-thrust linear motor with a lightweight and high-strength mover was developed for operating circuit breakers. The linear motor is composed of a lightweight mover that has permanent magnets sandwiched between magnetic poles and an armature with a three-dimensional magnetic circuit. The specifications and performance of the linear motor were determined to cut off current soundly. Then, a prototype of a fully electrically operated breaker using linear motor was investigated. The linear-motor-based operating mechanism designed for the circuit breaker reached the open-pole position in 13.2 ms from the start of movement. However, the time from opening to 0.5 cycle was 9.0 ms. In addition, the variation in breaking operation time was within 1 ms, which was expected that stable controlled operation.</p>","PeriodicalId":50550,"journal":{"name":"Electrical Engineering in Japan","volume":"215 4","pages":""},"PeriodicalIF":0.4,"publicationDate":"2022-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77331799","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
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