SHOYAMA Masahito

J-GLOBAL         Last updated: Nov 8, 2018 at 12:31
 
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Name
SHOYAMA Masahito
E-mail
shoyamaees.kyushu-u.ac.jp
Affiliation
Kyushu University
Section
Faculty of Information Science and Electrical Engineering
Job title
助教授
Degree
Dr. of Engineering

Research Areas

 
 

Education

 
 
 - 
1986
Graduate School, Division of Engineering, Kyushu University
 
 
 - 
1981
Faculty of Engineering, Kyushu University
 

Misc

 
KAWAMURA YUSUKE, SHOYAMA MASAHITO
電気学会半導体電力変換研究会資料   SPC-13(90-106) 19-24   Jul 2013
IMAMURA YASUTAKA, YANG SIHUN, SHOYAMA MASAHITO
電気学会家電・民生研究会資料   HCA-13(12-26) 43-48   May 2013
SHOYAMA MASAHITO, RAMADAN HUSAM A., IMAMURA YASUTAKA, KAWACHI KONOSUKE, YANG S., DOUSOKY GAMAL M.
電子情報通信学会技術研究報告   112(396(EE2012 28-56)) 153-157   Jan 2013
MOTOMURA SATOSHI, ABE SEIYA, KAWAHARA DAIKI, DOMOTO KAZUHIDE, ISHIZUKA YOICHI, NINOMIYA TAMOTSU, SHOYAMA MASAHITO, KAGA MASATO
電子情報通信学会技術研究報告   112(396(EE2012 28-56)) 87-91   Jan 2013
KAWAHARA DAIKI, ABE SEIYA, MOTOMURA SATOSHI, DOMOTO KAZUHIDE, ISHIZUKA YOICHI, NINOMIYA TAMOTSU, SHOYAMA MASAHITO, KAGA MASATO
電子情報通信学会技術研究報告   112(396(EE2012 28-56)) 23-27   Jan 2013
IMAMURA YASUTAKA, YANG SIHUN, SHOYAMA MASAHITO
電子情報通信学会技術研究報告   112(396(EE2012 28-56)) 81-86   Jan 2013
KAWACHI KONOSUKE, GOTO KENTA, YANG SIHUN, SHOYAMA MASAHITO
電子情報通信学会技術研究報告   112(396(EE2012 28-56)) 147-152   Jan 2013
GOTO KENTA, SHOYAMA MASAHITO
電子情報通信学会技術研究報告   112(396(EE2012 28-56)) 7-12   Jan 2013
MASUMOTO KIYOSHI, SHI KEWEI, SHOYAMA MASAHITO, TOMIOKA SATOSHI
電子情報通信学会技術研究報告   112(396(EE2012 28-56)) 1-6   Jan 2013
HIRAKAWA SHIN'YA, SHOYAMA MASAHITO
電子情報通信学会技術研究報告   112(396(EE2012 28-56)) 13-16   Jan 2013
YANG Sihun, ABE Seiya, SHOYAMA Masahito
2012(20) 63-68   Mar 2012
Nomura Kosuke, Abe Seiya, Yang Sihun, Shoyama Masahito, Ninomiya Tamotsu, Matsumoto Akira, Fukui Akiyoshi
IEICE technical report. Electromagnetic compatibility   111(420) 105-110   Jan 2012
In DC power supply system, a fast response circuit breaker is required. This paper considers and analyzes the malfunction issue of SiC-SIT based DC circuit breaker in DC power supply system. The malfunction mechanism is explained, and a solution m...
Ogawa Mariko, Abe Seiya, Zaitsu Toshiyuki, Obata Satoshi, Shoyama Masahito, Ninomiya Tamotsu
Proceedings of the IEICE General Conference   2011(2)    Feb 2011
YANG Sihun, ABE Seiya, SHOYAMA Masahito
Technical report of IEICE. Energy engineering in electronics and communications   110(393) 17-22   Jan 2011
The trend toward high power density, high efficiency, and low profile in power supplies has exposed a number of limitations in the use of magnetic component structures. Therefore, LLC resonant converter can be operated at high switching frequency ...
YANG Sihun, OGAWA Mariko, ABE Seiya, SHOYAMA Masahito, NINOMIYA Tamotsu, MATSUMOTO Akira, FUKUI Akiyoshi
Technical report of IEICE. Energy engineering in electronics and communications   110(393) 29-34   Jan 2011
In recent time, as information society is developed, the scale of data center becomes larger. The reduction of the power consumption at data center is emergent and significant challenge. In HVDC system, the fast response breaker is required. Semic...
TOMIOKA Satoshi, NINOMIYA Tamotsu, SHOYAMA Masahito
The transactions of the Institute of Electronics, Information and Communication Engineers. B   93(11) 1512-1521   Nov 2010
HIROMITSU Shinya, OGAWA Mariko, ABE Seiya, SHOYAMA Masahito, YONEZAWA Yu
Technical report of IEICE. Energy engineering in electronics and communications   109(371) 1-5   Jan 2010
Recent years, in order to reduce size and weight of power supply unit, high frequency operation is required. However, this higher frequency operation significantly increases switching loss and leads to lower efficiency. Soft switching techniques a...
YANG Sihun, ABE Seiya, SHOYAMA Masahito
Technical report of IEICE. Energy engineering in electronics and communications   109(371) 7-11   Jan 2010
This paper presents the design and implementation of LLC resonant converter using low-profile magnetic component. In the LLC resonant converter, ZVS turn-on and ZCS turn-off of MOSFETs and diode rectifiers can be achieved over the entire operating...
Abe Seiya, Ogawa Mariko, Zaitsu Toshiyuki, Obata Satoshi, Shoyamai Masahito, Ninomiya Tamotsu
Technical report of IEICE. Energy engineering in electronics and communications   109(371) 25-30   Jan 2010
Recently, the performance of the DSP and FPGA is developed remarkably. So, fully digital control is enabled in switch mode power supplies. However, in many cases, the control system is built by very complicatedly and very difficult theories such a...
NAKAYASHIKI Takeshi, ABE Seiya, SHOYAMA Masahito, MATSUO Masahiro, MICHISHITA Yusuke
Technical report of IEICE. Energy engineering in electronics and communications   109(371) 99-103   Jan 2010
Small size power supply is mandatory in cellular phone application. This small-size power supply should be able to supply high-power requirement of a full-operational mobile phone. Moreover, it should also be able to provide low-power in sleep-mod...
Nomura Kosuke, Abe Sieya, Fukushima Kentaro, Shoyama Masahito, Matsumoto Akira, Fukui Akiyoshi, Yamasaki Mikio, Ninomiya Tamotsu
Technical report of IEICE. Energy engineering in electronics and communications   109(371) 105-109   Jan 2010
Recently, the scale of data center is going larger. As a result, the power consumption at data center is rapidly increased. Therefore, in data center, changing power supply system is considered from AC to DC for the purpose of reducing the power c...
FUKUSHIMA Kentaro, NORIGOE Isami, SHOYAMA Masahito, NINOMIYA Tamotsu, HARADA Yosuke, TSUKAKOSHI Kenta
2009(149) 65-70   Nov 2009
Research reports on information science and electrical engineering of Kyushu University   14(2) 83-88   Sep 2009
Abe Seiya, Hirokawa Masahiko, Shoyama Masahito, Ninomiya Tamotsu
Proceedings of the IEICE General Conference   2009(2) "S-91"-"S-92"   Mar 2009
Research reports on information science and electrical engineering of Kyushu University   14(1) 7-12   Mar 2009
FUKUSHIMA Kentaro, NORIGOE Isami, NINOMIYA Tamotsu, SHOYAMA Masahito, HARADA Yosuke, TSUKAKOSHI Kenta
The transactions of the Institute of Electronics, Information and Communication Engineers. B   92(1) 345-352   Jan 2009
FUKUSHIMA Kentaro, NORIGOE Isami, NINOMIYA Tamotsu, SHOYAMA Masahito, HARADA Yosuke, TSUKAKOSHI Kenta
2008(73) 83-88   Jun 2008
SUEKAWA Daisuke, SHOYAMA Masahito, IBRAHIM Gamal Mahmoud Dousoky, ABE Seiya, NINOMIYA Tamotsu
Technical report of IEICE. Energy engineering in electronics and communications   107(430) 7-11   Jan 2008
In this paper, we apply Random-Switching control, by which the switching-noise spectrum is spread and its level is reduced, to DC-DC converter, using FPGA as digital circuit. The experimental results of noise-spectrum by the Random-Switching contr...
FUKUSHIMA Kentaro, NINOMIYA Tamotsu, SHOYAMA Masahito, NORIGOE Isami, HARADA Yosuke, TSUKAKOSHI Kenta
Technical report of IEICE. Energy engineering in electronics and communications   107(430) 59-63   Jan 2008
This paper proposes a novel DC-AC converter for fuel cells. And it analyzes the steady-state characteristics and considers the reduction method for input current ripple. The proposed DC-AC converter provides the boosted voltage-pulse directly to P...
Kawasaki Yosuke, Shoyama Masahito, Abe Seiya, Ninomiya Tamotsu, Matsuo Masahiro, Michishita Yusuke, Nishida Junji
Technical report of IEICE. Energy engineering in electronics and communications   107(430) 65-69   Jan 2008
As for the power supply used for the cellular phone, a miniaturization, power consumption and a high-speed response characteristic is requested. Power supply IC can miniaturize the passive element by improving the switching frequency and can achie...
SUEKAWA Daisuke, SHOYAMA Masahito, DOUSOKY IBRAHIM Gamal Mahmoud, ABE Seiya, NINOMIYA Tamotu
2007(88) 21-25   Dec 2007
Watariguchi Yu, Kawasaki Yousuke, Shoyama Masahito, Ninomiya Tamotsu, Matsuo Masahiro, Michishita Yuusuke, Nishida Junji
Technical report of IEICE. Energy engineering in electronics and communications   106(494) 71-74   Jan 2007
It is necessary to integrate the circuit to use the power supply by the cellular phone purpose. The value cannot be greatly taken for the inductor and the capacitor for the restriction of the size. Therefore, low power consumption is improved by a...
Ding Cheng Run, ABE Seiya, SHOYAMA Masatoshi, NINOMIYA Tamotsu
Technical report of IEICE. Energy engineering in electronics and communications   106(494) 95-100   Jan 2007
The start-up at power connection becomes problem in self-driven resonant converter. This paper investigates the method of start-up by means of digital control. Moreover, constant current control, constant power control and protection functions are...
FUKUSHIMA Kentaro, ABE Seiya, SHOYAMA Masahito, NINOMIYA Tamotsu, NORIGOE Isami, HARADA Yosuke, TSUKAKOSHI Kenta
Technical report of IEICE. Energy engineering in electronics and communications   106(494) 145-150   Jan 2007
The conventional DC-AC inverter for fuel cells needs a large capacitor between the DC-DC converter and the PWM inverter for the reduction of input current ripple. It is very difficult to reduce the size of the unit. This paper proposes a new circu...
WATARIGUCHI Yu, KAWASAKI Yousuke, SHOUYAMA Masahito, NINOMIYA Tamotsu, MATSUO Masahiro, MICHISHITA Yuusuke, NISHIDA Junji
2006(81) 61-64   Oct 2006
Shoyama Masahito, Deriha Fumitoshi, Ninomiya Tamotsu
Proceedings of the IEICE General Conference   2006(2) "S-33"-"S-34"   Mar 2006
Deriha Fumitoshi, Shoyama Masahito, Ninomiya Tamotsu
Technical report of IEICE. Energy engineering in electronics and communications   105(601) 7-12   Feb 2006
Small and efficient power supplies are required for use with various kinds of miniaturized electronic devices. Switched capacitor converters (SCC) is used widely for realizing this problem. Switched capacitor converters, which have no magnetic par...
SHOYAMA Masahito, DERIHA Fumitoshi, NINOMIYA Tamotsu
IEICE technical report. Electromagnetic compatibility   105(511) 47-52   Jan 2006
Recently, small size and high efficiency are required for power supplies in the portable electronic devices and the telecommunication equipment as their size reduction and performance advances. Because switched capacitor converters (SCC's) do not ...
WATARIGUCHI Yu, DERIHA Fumitoshi, SHOYAMA Masahito, NINOMIYA Tamotsu
2005(25) 97-102   Jul 2005
WATARIGUCHI Yu, DERIHA Fumitoshi, SHOYAMA Masahito, NINOMIYA Tamotsu
Technical report of IEICE. Energy engineering in electronics and communications   105(197) 97-102   Jul 2005
Small and efficient power supplies are required for use with various kinds of miniaturized electronic devices. Switched capacitor converters, which have no magnetic parts, can miniaturize the size and be efficient, so that they are used for portab...
Tsumura Tetsushi, Shoyama Masahito, Ninomiya Tamotsu
Proceedings of the IEICE General Conference   2005(2)    Mar 2005
Shoyama Masahito, Deriha Fumitoshi, Ninomiya Tamotsu
Proceedings of the IEICE General Conference   2005(2) "S-48"-"S-49"   Mar 2005
Deriha Fumitoshi, Shoyama Masahito, Ninomiya Tamotsu
Technical report of IEICE. Energy engineering in electronics and communications   104(651) 51-56   Feb 2005
Small and efficient power supplies are required for use with various kinds of miniaturized electronic devices. Switched capacitor converters, which have no magnetic parts, can miniaturize the size and be efficient, so that they are used for portab...
Tsumura Tetsushi, Shoyama Masahito, Ninomiya Tamotsu
Technical report of IEICE. Energy engineering in electronics and communications   104(651) 57-62   Feb 2005
Because conventional switching converters are usually using unbalanced circuit topologies, parasitic capacitance between the drain of an MOS-FET and the frame ground through its heat sink may generate the common-mode conducted noise. In this probl...
Steady-State Characteristics of Resonant Switched Capacitor Converter
Journal of Power Electronics (JPE)   Vol.5, No.3, pp.206-211    2005
IEEE 36th Power Electronics Specialists Conference (PESC '05) Record   pp.1966-1971    2005
Optimum Design Considerations of Balanced Boost Switching Converter to Reduce Common-Mode Conducted Noise
Proceedings of 2005 International Power Electronics Conference (IPEC '05)   pp.1966-1971    2005
Operation Analysis of Resonant Switched Capacitor Converter
Proceedings of 2005 International Power Electronics Conference (IPEC '05)   pp.508-512    2005
Tsumura Tetsushi, Li Ge, Shoyama Masahito, Ninomiya Tamotsu
Technical report of IEICE. Energy engineering in electronics and communications   103(653) 9-14   Feb 2004
Because conventional switching converters are usually using unbalanced circuit topologies, parastic capacitance between the drain of an MOS-FET and the frame ground through its heat sink may generate the common-mode conducted noise. We proposed a ...
Naka Toshiyuki, Shoyama Masahito, Ninomiya Tamotsu
Technical report of IEICE. Energy engineering in electronics and communications   103(653) 27-32   Feb 2004
Switched capacitor converters, which are based on charge and discharge operation of capacitors, have been used to realize small size and light weight DC-DC converters in various kinds of electronic devices mainly with a light load. However, conven...
Hayakawa Takafumi, Abe Seiya, Shoyama Masahito, Ninomiya Tamotsu
Technical report of IEICE. Energy engineering in electronics and communications   103(653) 69-74   Feb 2004
In recent years, voltage-mode controled multi-phase interleaving converter is widely used for microprocessors which demands low voltage, large current, and high speed feedback control response to the load change. This paper presents the bandwidth ...
Resonant Boost Switched Capacitor Converter with High Efficiency
IEEE International Conference on Industrial Electronics Control and Instrumentation (IECON'2004)   WC7-2    2004
Steady-State Characteristics of Resonant Switched Capacitor Converter
Proc. of 2004 International Conf. on Power Electronics (ICPE)   pp.II-137-141    2004
Common-Mode Noise Reduction by Current Cancellation in Balanced Buck-Boost Switching Converter
IEEE 4th International Power Electronics and Motion Control Conference (IPEMC'2004)   pp.1505-1510    2004
IEEE Power Electronics Specialists Conference Record, 04CH37551C   pp.3780-3786    2004
Mechanism of Common-Mode Noise Reduction in Balanced Boost Switching Converter
IEEE Power Electronics Specialists Conference Record, 04CH37551C   pp.1115-1120    2004
Analysis of Noise Current Cancellation Mechanism in Balanced Boost Switching Converter
Proceedings of 2004 International Symposium on Electromagnetic Compatibility   pp.725-728    2004
Common-Mode Noise Reduction Techniques for Switched-Mode Power Converters
Proceedings of 2004 International Symposium on Electromagnetic Compatibility   pp.193-196    2004
Shoyama Masahito, Li Ge, Ninomiya Tamotsu
Proceedings of the Society Conference of IEICE   2003(2) "S-27"-"S-28"   Sep 2003
LI Ge, NINOMIYA Tamotsu, SHOYAMA Masahito
IEEJ Transactions on Industry Applications   123(9) 1037-1042   Sep 2003
Several topologies of active-clamped DC-DC converters have been proposed before. This paper compares the common-mode noise properties of the conventional type using a pulse transormer for a gate driver and the common-source type proposed recently....
Ohba Masashi, Shouyama Masahito, Ninomiya Tamotsu
Proceedings of the IEICE General Conference   2003(2)    Mar 2003
Li Ge, Shoyama Masahito, Ninomiya Tamotu
Proceedings of the IEICE General Conference   2003(2)    Mar 2003
Shoyama Masahito, Abe Seiya, Ninomiya Tamotsu
Proceedings of the IEICE General Conference   2003(2) "S-27"-"S-28"   Mar 2003
Ohba Masashi, Shoyama Masahito, Ninomiya Tamotsu
Technical report of IEICE. Energy engineering in electronics and communications   102(643) 7-12   Feb 2003
Common-mode conducted noise in switching converters frequently causes radiated noise emission from power cord, so it is important to reduce this noise enough to meet EMC. The anothers proposed a balanced switching converter, which is a way to redu...
Li Ge, Shoyama Masahito, Ninomiya Tamotsu
Technical report of IEICE. Energy engineering in electronics and communications   102(643) 107-112   Feb 2003
An active-clamp circuit is an effective method to suppress the switching surge and to achieve the soft switching operation in switching dc-dc converters. Recently, the common-source type active-clamp circuit has been proposed to connect directly t...
Li Ge, Shoyama Masahito, Ninomiya Tamotsu
Technical report of IEICE. Energy engineering in electronics and communications   101(650) 33-40   Feb 2002
An active-clamp circuit is an effective method to suppress the switching surge and to realize the soft switching in switching dc-dc converters. Recently, the common-source type active-clamp circuit was presented to enable direct connection of sour...
Ohba Masashi, Shoyama Masahito, Ninomiya Tamotsu
Technical report of IEICE. Energy engineering in electronics and communications   101(650) 41-46   Feb 2002
Common-mode conducted noise in switching converters frequently causes radiated noise emission from power cord, so it is important to reduce this noise enough to meet EMC. Because conventional switching converters have been usually using unbalanced...
Shoyama Masahito, Okunaga Tsuyoshi, Li Ge, Ninomiya Tamotu
Proceedings of the IEICE General Conference   2001(2) 725-726   Mar 2001
SHOYAMA Masahito, OKUNAGA Tsuyoshi, LI Ge, NINOMIYA Tamotsu
Technical report of IEICE. Energy engineering in electronics and communications   100(627) 49-56   Feb 2001
Common-mode conducted noise in switching converters frequently causes radiated noise emission from power cord, so it is important to reduce this noise enough to meet EMC. Because conventional switching converters have been usually using unbalanced...
Li Ge, Ninomiya Tamotsu, Shoyama Masahito, Inoue Tokunari
Technical report of IEICE. Energy engineering in electronics and communications   100(545) 9-15   Jan 2001
Several configurations of active-clamped DC-DC converters have been proposed. This paper compares the common-mode-noise properties of the conventional type using a pulse transformer for a gate driver and the common-source type. Using a noise measu...
Li Ge, Ninomiya Tamotsu, Shoyama Masahito, Inoue Tokunari
IEICE technical report. Component parts and materials   100(546) 9-15   Jan 2001
Several configurations of active-clamped DC-DC converters have been proposed. This paper compares the common-mode-noise properties of the conventional type using a pulse transformer for a gate driver and the common-source type. Using a noise measu...
JIN Chun-Feng, NINOMIYA Tamotsu, SHOYAMA Masahito, NAKAGAWA Shin
The transactions of the Institute of Electronics, Information and Communication Engineers. B   83(11) 1513-1519   Nov 2000
Li Ge, Ninomiya Tamotsu, Shoyama Masahito, Yu Zhi, Segawa Takeshi
Proceedings of the Society Conference of IEICE   2000(2)    Sep 2000
HAMAMURA Sunao, ZAITSU Toshiyuki, NINOMIYA Tamotsu, SHOYAMA Masahito, FUDA Yoshiaki
The transactions of the Institute of Electronics, Information and Communication Engineers. B   82(10) 1838-1846   Oct 1999
Steady-State Characteristics of the Push-Pull Piezoelectric Inverter
IEICE Transactions on Communications   E82-B(8) 1318-1325   1999
KOHAMA Teruhiko, NINOMIYA Tamotsu, SHOYAMA Masahito
The transactions of the Institute of Electronics, Information and Communication Engineers   81(10) 621-628   Oct 1998
KOHAMA Teruhiko, NINOMIYA Tamotsu, SHOYAMA Masahito
Research reports on information science and electrical engineering of Kyushu University   3(2) 203-209   Sep 1998
KOHAMA Teruhiko, NINOMIYA Tamotsu, SHOYAMA Masahiko, IHARA Fumiaki
The transactions of the Institute of Electronics, Information and Communication Engineers   81(6) 408-415   Jun 1998
Ooyama Ichirou, Ninomiya Tamotsu, Shoyama Masahito, Negome Taketo, Zaitsu Toshiyuki
Technical report of IEICE. Energy engineering in electronics and communications   98(132) 43-50   Jun 1998
A multiple-output dc-dc converter using the cross regulation enables the reduction in size, weight, and cost. However, the effect of the smoothing capacitances on the converter stability has not been discussed enough. Besides, the input circuit is...
Hamamura Sunao, Zaitsu Toshiyuki, Ninomiya Tamotsu, Shoyama Masahito
Technical report of IEICE. Energy engineering in electronics and communications   98(132) 81-86   Jun 1998
A Piezoelectric-Transformer (PT) is expected to be a low-electric-noise device because it transmits power by mechanical vibration. However, there has been no study about noise characteristics of the PT so far. In this paper, we propose a model whi...
Hakoda Yasunori, Ninomiya Tamotsu, Shoyama Masahito
Proceedings of the IEICE General Conference   1998(2)    Mar 1998
Nojiri Yoshihiro, Oyama Ichiro, Negome Taketo, Zaitsu Toshiyuki, Ninomiya Tamotsu, Shoyama Masahito
Proceedings of the IEICE General Conference   1998(2)    Mar 1998
Yamane Takashi, Sako Yoshikazu, Zaitsu Toshiyuki, Hamamura Sunao, Ninomiya Tamotsu, Shoyama Masahito, Fuda Yoshiaki
Proceedings of the IEICE General Conference   1998(2)    Mar 1998
KOHAMA Teruhiko, NINOMIYA Tamotsu, SHOYAMA Masahito
Research reports on information science and electrical engineering of Kyushu University   3(1) 81-86   Mar 1998
Hidaka Takayuki, Kakehashi Hidenori, Ohta Yukihiko, Ninomiya Tamotsu, Shoyama Masahito
Technical report of IEICE. Energy engineering in electronics and communications   97(542) 31-37   Feb 1998
Electronic ballasts for fluorescent lamps have good features compared with the conventional magnetic ballasts, and are widely used. In recent years, new types of lamps with small tube diameter have been developed to reduce the amount of lamp mater...
Tanaka Hidekazu, Ninomiya Tamotsu, Shoyama Masahito, Zaitsu Toshiyuki
Technical report of IEICE. Energy engineering in electronics and communications   97(542) 39-45   Feb 1998
Resonant converters have several salient features of small-size, light-weight, high-efficiency, low-noise, etc. We have presented a novel ZVS-PWM controlled current-mode resonant converter with active clamp technique. In this converter, the induct...
Hakoda Yasunori, Ninomiya Tamotsu, Shoyama Masahito
Technical report of IEICE. Energy engineering in electronics and communications   97(541) 29-36   Feb 1998
In a DC-DC converter with a high convertoin ratio, not only a duty-ratio control but also a power transformer with a large turns-ratio are utilized in practice. A large turns-ratio transformer has a large leakage-inductance and then it causes harm...
KOHAMA Teruhiko, NINOMIYA Tamotsu, SHOYAMA Masahito
Technical report of IEICE. Energy engineering in electronics and communications   97(465) 1-8   Jan 1998
Problems of synchronous rectifiers (SRs) used in parallel-module DC-DC converter system is revealed. Abnormal oscillation, excessive voltage and current stresses are observed in the parallel system due to the inherent capabilities of SRs such as r...
Habu M., Kakehashi H., Ninomiya T., Shoyama M., Ogasawara H., Ohta Y.
Technical report of IEICE. Energy engineering in electronics and communications   97(465) 9-15   Jan 1998
High-Intensity-Discharge (HID) lamps have prominent features of high brightness, high efficacy, and long life. On the other hand, high-voltage pulses of several kilovolts are needed to turn it on. This paper proposes a HID lamp igniter using a two...
KOHAMA Teruhiko, NINOMIYA Tamotsu, SHOYAMA Masahito
IEICE technical report. Component parts and materials   97(466) 1-8   Jan 1998
Problems of synchronous rectifiers (SRs) used in parallel-module DC-DC converter system is revealed. Abnormal oscillation, excessive voltage and current stresses are observed in the parallel system due to the inherent capabilities of SRs such as r...
Habu M., Kakehashi H., Ninomiya T., Shoyama M., Ogasawara H., Ohta Y.
IEICE technical report. Component parts and materials   97(466) 9-15   Jan 1998
High-Intensity-Discharge (HID) lamps have prominent features of high brightness, high efficacy, and long life. On the other hand, high-voltage pulses of several kilovolts are needed to turn it on. This paper proposes a HID lamp igniter using a two...
Static and Dynamic Analysis of Paralleled DC-to-DC Converter System with Averaged Current-balancing Controllers
J81-B-I(6) 408-415   1998
TANAKA Hidekazu, YAMANE Takashi, NINOMIYA Tamotsu, SHOYAMA Masahito, ZAITSU Toshiyuki
The transactions of the Institute of Electronics, Information and Communication Engineers   80(11) 809-814   Nov 1997
Yamane Takashi, Zaitsu Toshiyuki, Hamamura Sunao, Ninomiya Tamotsu, Shoyama Masahito, Fuda Yoshiaki
Technical report of IEICE. Energy engineering in electronics and communications   97(367) 13-19   Nov 1997
The Piezoelectric Transformer Converter (PT-converter) which we had presented before did not have a sufficiently high efficiency. Changing the output rectifier circuit, its efficiency has been improved up t0 86%. However, when the switching freque...
Yamane Takashi, Zaitsu Toshiyuki, Hamamura Sunao, Ninomiya Tamotsu, Shoyama Masahito, Fuda Yoshiaki
Technical report of IEICE. Energy engineering in electronics and communications   97(278) 31-36   Sep 1997
Piezoelectric Transformers which transmit electrcal energy through machanical vibration are attractive electrical devices due to their imcombustibility, good isolation, low profile, and high power density. We have presented some types of Piezoelec...
Tanaka Hidekazu, Yamane Takashi, Ninomiya Tamotsu, Shoyama Masahito
Technical report of IEICE. Energy engineering in electronics and communications   97(174) 1-7   Jul 1997
Resonant converters have several salient features of small-size, light-weight, high-efficiency, low-noise, etc. We have presented a novel ZVS-PWM controlled current-mode resonant converter with active clamp technique. In this converter, the equiva...
Hakoda Yasunori, Tursun Dilmurat, Song Fang Jiang, Hashimoto Takayoshi, Shoyama Masahito, Ninomiya Tamotsu
Technical report of IEICE. Energy engineering in electronics and communications   97(174) 9-14   Jul 1997
This paper discusses a buck-boost converter with a large-turns-ratio transformer and an active-clamp circuit, which is used as a bi-directional DC-DC converter with a high conversion ratio. Its steady-state characteristics of bi-directional voltag...
KOHAMA Teruhiko, NINOMIYA Tamotsu, SHOYAMA Masahito
1997(39) 37-43   May 1997
KOHAMA Teruhiko, NINOMIYA Tamotsu, SHOYAMA Masahito
Technical report of IEICE. Energy engineering in electronics and communications   97(43) 37-43   May 1997
In a paralleled module DC-to-DC converter system, some incorrect operation and interference between converter modules are occurred by their switching surges and switching ripples. To solve these problems it must be required to synchronize the swit...

Research Grants & Projects

 
Ministry of Education, Culture, Sports, Science and Technology: Grants-in-Aid for Scientific Research(基盤研究(C))
Project Year: 2007 - 2008    Investigator(s): Masahito SHOYAMA
Ministry of Education, Culture, Sports, Science and Technology: Grants-in-Aid for Scientific Research(基盤研究(B))
Project Year: 1998 - 2000    Investigator(s): Tamotus NINOMIYA
The purpose of this research is to develop a highly reliable and long-life power system using solar-cell panels and electrolytic double layer capacitors(EDLC), and to improve the characteristics of a high-frequency switching power converter utiliz...
Ministry of Education, Culture, Sports, Science and Technology: Grants-in-Aid for Scientific Research(基盤研究(C))
Project Year: 1997 - 1998    Investigator(s): 庄山 正仁, Teruhiko KOHAMA
EMC techniques especially for decreasing higher harmonics in Household Electric Appliances and Wide Use Electric Apparatus are investigated and discussed. Following results are obtained by this project.1. Characteristics of PFC converter which hav...
Ministry of Education, Culture, Sports, Science and Technology: Grants-in-Aid for Scientific Research(一般研究(A))
Project Year: 1988 - 1989    Investigator(s): Koosuke HARADA
A new type of power interface using synchronizing phenomenon is proposed and analyzed. The following are the research results obtained.1. The new power interface system employs the AC line as a power storage element instead of conventional batteri...
EMC in Switching Converters
On Application of the Piezoelectric-Transformer to Switching Converters
Development of High-Speed Circuit Simulator for Switching Power Supplies