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2019 Volume 45 Pages
60-64
Published: 2019
Released on J-STAGE: June 13, 2020
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Makoto Saito
2019 Volume 45 Pages
65-74
Published: 2019
Released on J-STAGE: June 13, 2020
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In this paper, the EMI noise characteristics on a three-phase SJ-MOSFET inverter composed of a pulse transformer type recovery-assist circuit are experimentally verified. First, the configuration and operation principle of the proposed pulse transformer recovery-assist circuit are described and an example of implementation to a 3.7 kW three-phase SJ-MOSFET inverter is presented. Next, the conducted noise and the radiated noise in case of driving a three-phase 3.7 kW induction motor with or without a recovery-assist circuit are verified. The EMI noise characteristics are measured based on CISPR11 at EMC site. Finally, the difference between EMI noise with and without a recovery-assist circuit is verified from the viewpoint of"Modeling of EMI noise source p"roposed by the author.
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Makoto Saito
2019 Volume 45 Pages
75-82
Published: 2019
Released on J-STAGE: June 13, 2020
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This paper describes how radiation noise of SiC-MOSFET and GaN-FET inverter differs from conventional IGBT and SJ-MOSFET inverter from benchmark test results using a 3.7 kW three-phase inverter circuit. Specifically, IGBT (2 types), SJMOSFET (2 types), SiC-MOSFET, GaN-FET (1 type each) are mounted on the DC 300 V input 20 A output three-phase inverter configured with TO-247. Only the gate drive circuit is designed as a power device recommended condition, and the other circuit configurations including the snubber circuit and the constants are unified. Next, observe the switching waveform with each inverter and measure the radiation noise when driving a 3.7 kW three-phase induction machine at a switching frequency of 10 kHz with a 10 m method based on CISPR at the EMC site. Finally, the difference of the radiation noise by the power device is verified from the viewpoint of "Modeling of EMI noise source "proposed by the author.
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Ryosuke Kawashima, Tomokazu Mishima, Chiaki Ide
2019 Volume 45 Pages
83-89
Published: 2019
Released on J-STAGE: June 13, 2020
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A new prototype of a soft-switching three-phase utility frequency ac to single-phase high-frequency ac direct power converter for induction heating (IH) applications is presented in this paper. The newly-proposed ac-ac converter features direct frequency conversion under the principle of series resonance and soft switching operations with minimized number of bidirectional switches. The validity of the proposed ac-ac converter is revealed by essential experimental results with a 3.5 kW-40 kHz prototype.
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Yuto Takayama, Hiroaki Yamada
2019 Volume 45 Pages
90-97
Published: 2019
Released on J-STAGE: June 13, 2020
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This paper deals with a dual active bridge (DAB) converter based battery charger in a stand-alone wind power generation system with a high-inertia small-scale wind turbine. The conventional proposed system needs four converters from a generator to the motor load. This proposed system can improve power conversion efficiency by reducing the number of converters. The DAB converter performs as battery controller. When the generated power is larger than the consumed power of the motor load, the DAB converter acts battery charging mode. On the other hand, when the generated power is smaller than consumed power of the motor load, the DAB converter acts battery discharging mode. Simulation results demonstrate that the proposed system can control the power flow in the stand-alone wind power generation system.
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Kenji Yamanaka, Kazuki Okada, Masahide Hojo
2019 Volume 45 Pages
98-105
Published: 2019
Released on J-STAGE: June 13, 2020
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We proposed a mind hybrid system using an alternator for medium-sized vehicles,and confirmed the fuel consumption reducation effect by experiments. However,medium-sized vehicles with large inertia consume much energy as heat during deceleration.Therefore,it is important to regenerate the kinetic energy of the vehicle with high efficiency. The amount of regenerative energy leads to low fuel consumption.
In this paper,the standard alternator is modified to the winding switching type alternator.By moution this alternator on a vehicle,regenation of decelerating energy has increased.We report that the improvement has been confirmed by the modification.
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Kenichi Nishijima
2019 Volume 45 Pages
106-112
Published: 2019
Released on J-STAGE: June 13, 2020
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In the power electronics field, the movement of the conduction EMI standard to be expanded to 150 kHz or less is being carried out at IEC. In the frequency range below 150 kHz, it is necessary to take measures against noise from the fundamental wave. In this report, we describe the situations that the effect of filtering measures on frequency range and measurement conditions of 150 kHz or less and 150 kHz or more are studied.
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Yuki Saito, Hironori Ozeki, Hiroaki Kakigano
2019 Volume 45 Pages
113-120
Published: 2019
Released on J-STAGE: June 13, 2020
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This paper presents a stability analysis of a closed loop controlled dual active bridge (DAB) dc-dc converter. At first, a discrete time model of a DAB dc-dc converter considering dead time effects is developed. Then, the stability of the output voltage control for DAB dc-dc converter is analyzed. Finally, the theoretical results are verified with a circuit simulator.
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Tomohide Shirakawa, Kazuhiro Umetani, Eiji Hiraki
2019 Volume 45 Pages
121-129
Published: 2019
Released on J-STAGE: June 13, 2020
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In order to reduce copper loss, high step-down DC-DC converter often employs center-tapped rectifier. In addition, a plate shape one turn coil is utilized for transformer for making a high step-down ratio. We focused on the proximity effect in plate shape one turn coil, and investigate the cause of worsening the copper loss. In this paper, based on this investigation, we propose rectification method using winding integrated with rectifier. In addition, we discuss practical issues of the proposed method and present the solution strategy. The proposed method is verified by experiments, which suggests the effectiveness of the proposed method to high current applications.
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Yoshimichi Ito, Isao Iyoda, Noriyuki Kimura, Toshimitsu Morizane
2019 Volume 45 Pages
130-137
Published: 2019
Released on J-STAGE: June 13, 2020
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This paper describes a study on 500Hz modular multi-level converter(MMC) using real time simulators. Integral time step in real time simulation is limited to keep real time performance. The outline specification of experimental model, control system for MMC, and results of off-line simulation and real-time simulation using two real-time simulaters are reported.
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Takuto Nishitani, Kosuke Kato, Hideto Yonemori, Hiromasa Takeno
2019 Volume 45 Pages
138-145
Published: 2019
Released on J-STAGE: June 13, 2020
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In decade years, the magnetic coupled resonance have been attracted interest to realize the effective WPT (Wireless power transmission) system under the long distance condition. The novel power transmission coil structure, which is consists of the additional resonant tank circuit nearby and connect with the transmission coil, is proposed in this paper. The effectiveness of additional resonant circuit topology to improve the power transmission efficiency are explained and discussed based on the simulating results.
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Hiroaki Endo, Masao Yokoyama, Kaoru Inoue, Toshiji Kato
2019 Volume 45 Pages
146-153
Published: 2019
Released on J-STAGE: June 13, 2020
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A battery (BT) power conditioning systems (PCSs) is expected to be an effective system for coping with the energy issues we will face in the future. This paper establishes an energy system with BTs that will corresponding ‘upward and downward Demand Response (DR)’ by using receiving power variable control of PCS. According to the measured receiving power, energy management system (EMS) control is enabled by using receiving power variable control of PCS without using the exclusive controller. The effectiveness of this system will be verified using simulation and actual equipment.
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Atsushi Umemura, Rion Takahashi, Junji Tamura
2019 Volume 45 Pages
154-162
Published: 2019
Released on J-STAGE: June 13, 2020
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As the penetration level of variable-speed wind turbines continues to increase, characteristics of low inertia and lack of synchronous power of such devices can have a serious impact on the transient stability of a grid. One solution toward stabilizing such a grid with renewable energy sources is to provide additional inertia and synchronizing power in a virtual manner. This paper proposes an optimal control method that can follow the virtual generator model under constraints. As a result, it was shown that proposed method was possible to suppress the peak of the filter input power in instantaneous voltage drop.
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Naoko Noda, Masayuki Sanada, Shigeo Morimoto, Yukinori Inoue
2019 Volume 45 Pages
163-169
Published: 2019
Released on J-STAGE: June 13, 2020
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High-speed motor driven in low voltage are used in equipment such as electric reel and handy vacuum cleaner. If a motor with a general structure used in an operating range of several thousand revolutions is used as it is in a high-speed range of several tens of thousands of revolutions, efficiency will decrease due to a large amount of iron loss. In this paper, we proposed models in which the stator teeth length and the magnet material were changed in order to suppress the iron loss that causes the efficiency reduction of the high-speed PM motor. In this case, since the eddy current loss occurs in the armature conductor, the effect of reducing the conductor eddy current loss by using the Litz wire was also examined. As a result, it was shown that the proposed model improves the efficiency compared to the conventional structure.
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Kohei Sugiyama, Taishi Kitamura, Shuto Uwai, Takahiro Yano, Yoshitaka ...
2019 Volume 45 Pages
170-179
Published: 2019
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In this paper, we propose the system of SP-type resonant circuit with the DAB DC-DC converter for the wireless power transfer. We derive a non-tight transformer circuit and its equation, which using a coupling coefficient and turn ratio, to design for our system. By this derived circuit equation, it is also possible to derive the resonant capacitor parameters for the SP-type resonant circuit and a block diagram. This block diagram is possible simulating while varying the coupling coefficient. Also, we design that this system controls DAB DC-DC converters while synchronizing with each microcomputer. We confirm that the converter control operates normally, and it was clarified that the SP-type performs power transmission efficiency of 90% or more between two power transfer coils and that bidirectional power transmission.
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2019 Volume 45 Pages
180-184
Published: 2019
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Ryota Miyao, Hideki Omori, Toshimitu Morizane, Noriyuki Kimura
2019 Volume 45 Pages
185
Published: 2019
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Shaoyang Wang, Kaname Tominaga, Toshiji Kato, Kaoru Inoue
2019 Volume 45 Pages
186
Published: 2019
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Keigo Kato, Naoki Yamamura, Muneaki Isida
2019 Volume 45 Pages
187
Published: 2019
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Aoto Yamamoto, Hideki Omori, Masahito tsuno, Noriyuki Kimur, Toshimits ...
2019 Volume 45 Pages
188
Published: 2019
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Shintaro Morino, Masayuki Sanada, Shigeo Morimoto, Yukinori Inoue
2019 Volume 45 Pages
189
Published: 2019
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Atsuki Kyuhata, Shigeo Morimoto, Yukinori Inoue, Masayuki Sanada
2019 Volume 45 Pages
190
Published: 2019
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Kento Betto, Satoshi Joryo, Thoshimitsu Morizane, Noriyuki Kimura
2019 Volume 45 Pages
191
Published: 2019
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Kosuke Maeda, Fumiya Uesaki, Masakazu Michihira
2019 Volume 45 Pages
192
Published: 2019
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Taketo IKEUCHI, Hirokazu IMADE, Shin-ichi MOTEGI
2019 Volume 45 Pages
193
Published: 2019
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Kazuki Fujita, Masaru Hasegawa
2019 Volume 45 Pages
194
Published: 2019
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Hiro Hosoi, Tomokazu Mishima
2019 Volume 45 Pages
195
Published: 2019
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[in Japanese], [in Japanese], [in Japanese], [in Japanese], [in Japane ...
2019 Volume 45 Pages
196
Published: 2019
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Tatsuya Matsuoka, Yuudai Yamashita, Hiroaki Kakigano
2019 Volume 45 Pages
197
Published: 2019
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[in Japanese], [in Japanese], [in Japanese], [in Japanese]
2019 Volume 45 Pages
198
Published: 2019
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Rina Usui, Kimihiro Nanamori
2019 Volume 45 Pages
199
Published: 2019
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Tatsuki Fujita, Shigeo Masukawa
2019 Volume 45 Pages
200
Published: 2019
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Tadaaki Miyake, Yoshitaka Kawabata
2019 Volume 45 Pages
201
Published: 2019
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Kazuki Ando, Yuma Ishikawa, Masaru Hasegawa
2019 Volume 45 Pages
202
Published: 2019
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Kentaro Ueda, Yukinori Inoue, Shigeo Morimoto, Masayuki Sanada
2019 Volume 45 Pages
203
Published: 2019
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Hiroki Nagasaki, Yukinori Inoue, Shigeo Morimoto, Masayuki Sanada
2019 Volume 45 Pages
204
Published: 2019
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Yuhei Nakta, Noriyuki Kimura, Toshimitu Morizane, Hideki Omori
2019 Volume 45 Pages
205
Published: 2019
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Yuki Nagata, Toshimitsu Morizane, Toshimitsu Morizane, Noriyuki Kimura ...
2019 Volume 45 Pages
206
Published: 2019
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Rintaro Takeshita, Kenji Yamanaka, ,Masahide Hojo
2019 Volume 45 Pages
207
Published: 2019
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Masashi Kawai, Naoya Tsujimoto, Daichi Sakamoto, Shinichi Nakano, Mana ...
2019 Volume 45 Pages
208
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Yoshiki Motokage, Ryohei Yabuki, Hiroto Nishitani, Kousuke Katou, Hide ...
2019 Volume 45 Pages
209
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Tomoya HANAKURA, Hodaka OHTSUKA, Shin-ichi MOTEGI
2019 Volume 45 Pages
210
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Ryusei Miyazaki, Tomokazu Mishima
2019 Volume 45 Pages
211
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