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Driving Performance Experimental Analysis of Series Chopper Based EV Power Train
Atsuo Kawamura,Giuseppe Guidi,Yuki Watanabe,Yukinori Tsuruta,Naoki Motoi,Tae-Woong Kim 전력전자학회 2012 JOURNAL OF POWER ELECTRONICS Vol.12 No.6
In this paper, the series chopper based power train for electric vehicle is proposed for aiming the increase of one battery charge driving distance. Both the motor test bench based experiments and the chassis dynamo based experiments are tested and then analyzed for EV driving performance that the proposed power train with SAZZ chopper and Quasi-PAM control scheme is compared with or without the series chopper. It is confirmed through two kinds of experimental analyses that the series chopper power train for EV can be useful to extend the driving distance if the high efficiency and the low weight of chopper are satisfied.
SURVEY OF REAL TIME DIGITAL FEEDBACK CONTROL OF PWM INVERTER FOR SINUSOIDAL WAVEFORM SYNTHESIS
Atsuo KAWAMURA 전력전자학회 1989 ICPE(ISPE)논문집 Vol.- No.-
In 1985, the first paper on the deadbcat control of a single phase PWM inverter aimed for UPS (Uninterruptible Power Supply) appeared. Since then, various papers have been published on the real time digital feedback control of single phase and three phase PWM inverters for sinusoidal output waveform synthesis, which are surveyed and summarized in this paper.<br/>
Frequency Regulation for Parallel-Connected UPS system under Independent Control
Atsuo Kawamura,Ryota Oikawa,Yasunari Yoshioka,Yasushi Matsumoto 전력전자학회 2007 ICPE(ISPE)논문집 Vol.- No.-
This paper proposes a frequency regulation technique for the stable operation of parallel connected UPS system under the independent control proposed by authors group. The features of independent control of parallel UPS are (1) stable operation is guaranteed by sensing the output current of each UPS, and no communication is required between the UPS’s, (2) The phase and amplitude of each UPS voltage are generated by a simple PI controller, (3) The lateral current between the UPS’s are compensated by the lateral current compensator, (4) the load sharing is autonomously achieved, (5) the system frequency changes depending on the control gains and load. The last disadvantage is now solved by adding a simple control loop in the independent control. The paper presents the theory, simulation and experiments.
Kawamura, Atsuo,Kim, Tae-Woong The Korean Institute of Electrical Engineers 2013 Journal of Electrical Engineering & Technology Vol.8 No.4
The proper equivalent circuit is newly presented for electro-magnetic resonance based wireless power transfer. Based on the proposed equivalent circuit of open-ended helical antennas, the parameter identification of helical antennas can be well derived for highly efficient wireless power transfer. The well-established equivalent circuit in high frequency ranges is developed for analyzing a resonance enhanced-electromagnetic coupling helical antennas and the unknown parameters for helical antennas are identified by experiments. The effectiveness based on the proposed equivalent circuit is verified through experiments.
Atsuo Kawamura,Tae-Woong Kim 대한전기학회 2013 Journal of Electrical Engineering & Technology Vol.8 No.4
The proper equivalent circuit is newly presented for electro-magnetic resonance based wireless power transfer. Based on the proposed equivalent circuit of open-ended helical antennas, the parameter identification of helical antennas can be well derived for highly efficient wireless power transfer. The well-established equivalent circuit in high frequency ranges is developed for analyzing a resonance enhanced-electromagnetic coupling helical antennas and the unknown parameters for helical antennas are identified by experiments. The effectiveness based on the proposed equivalent circuit is verified through experiments.
Driving Performance Experimental Analysis of Series Chopper Based EV Power Train
Kawamura, Atsuo,Guidi, Giuseppe,Watanabe, Yuki,Tsuruta, Yukinori,Motoi, Naoki,Kim, Tae-Woong The Korean Institute of Power Electronics 2012 JOURNAL OF POWER ELECTRONICS Vol.12 No.6
In this paper, the series chopper based power train for electric vehicle is proposed for aiming the increase of one battery charge driving distance. Both the motor test bench based experiments and the chassis dynamo based experiments are tested and then analyzed for EV driving performance that the proposed power train with SAZZ chopper and Quasi-PAM control scheme is compared with or without the series chopper. It is confirmed through two kinds of experimental analyses that the series chopper power train for EV can be useful to extend the driving distance if the high efficiency and the low weight of chopper are satisfied.
Zinc-containing tricalcium phosphate and related materialsfor promoting bone formation
Atsuo Ito,Makoto Otsuka,Haruo Kawamura,Masako Ikeuchi,Hajime Ohgushi,Yu Sogo,Noboru Ichinose 한국물리학회 2005 Current Applied Physics Vol.5 No.5
Calcium phosphate is a suitable carrier of zinc, an essential element that has stimulatory effects on bone formation in vitro and in vivo as well as an inhibitory effect on osteoclastic bone resorption in vitro. The highest zinc content is attained in b-tricalcium phosphate, where the zinc content reaches 6 wt%. Both rat and human bone marrow cells (BMCs) cultured on zinc-containing b-tricalcium phosphate and hydroxyapatite composite ceramics differentiated more than BMCs cultured on zinc-free composite ceramics in the presence of b-glycerophosphate and dexamethasone. The acceptable dose of zinc was higher for human BMCs than for rat BMCs. The solubility of ZnTCP, which contains a nontoxic level of zinc, decreased to 52–92% that of pure TCP in the pH range of 5.0–7.4. However, the resorbed volume of ZnTCP was much lower than that expected from the in vitro solubility of ZnTCP, becoming as low as 26–20% that of TCP, which indicates that the reduction in the resorbability of ZnTCP would be attributable principally to its lowered cellular activation property relative to that associated with pure TCP. Probably due to the lowered cellular activation property associated with ZnTCP, bone loss at the bone-implant interface was significantly arrested in the longterm implantation of ZnTCP/HAP. The intramuscular injection of ZnTCP powder is effective in increasing bone mineral density in the vicinity of the injected site in osteopenic animals. All these findings suggest that zinc-containing calcium phosphate is a biomaterial that promotes bone formation.
Tsuruta Yukinori,Kawamura Atsuo The Korean Institute of Power Electronics 2006 JOURNAL OF POWER ELECTRONICS Vol.6 No.1
This paper is a record of the study on a high efficiency and high power chopper based on the new soft switching method QRAS (Quasi~resonant Regenerating Active Snubber) designed for a Fuel Cell Electric Vehicle (FCEV). This power chopper is basically proposed for 25kHz soft switching. To confirm the practicality and effectiveness of the converter, the fabrication of a prototype-model using IGBTs was completed. Additionally, a 8kW rating test, a light load test, a current discontinuous mode test and a stable operation resonance test was completed. The circuit geometry, the basic operation, and the 8kW one-tenth-prototype test results are reported with a $97.5\%$ efficiency measurement.
Yukinori Tsuruta,Atsuo Kawamura 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
This paper describes a record of the study on a high efficiency and high frequency insulation type converter based on new DAB (Dual Active Bridge) soft switching method aimed for the electric vehicle (EV). This power converter is basically proposed for the 20 kHz soft switching with closed loop control by phase shift control using DSP. For evaluating the practical effectiveness of new DAB method converter, the preceding fabrication using IGBT module and power MOSFET module has been completed and basic operational test, the efficiency measurement, light load test and closed loop control test was obtained. The load test by 4 kW of maximum load has been completed. 95.6 % efficiency at 4 kW was obtained and it corresponds to 16 kW with efficiency of 99 %.