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Koki Ogura,Srawouth Chandhaket,Mutsuo Nakaoka,Haruo Terai,Shinichiro Sumiyoshi,Takeshi kitaizumi,Hideki Omori 전력전자학회 2002 JOURNAL OF POWER ELECTRONICS Vol.2 No.3
The utility interfaced sinewave modulation inverter for the solar photovoltinec power conditioner with a high frequency transformer is presented for residential applications. As compared with the conventional full-bridge hard switching sinewave PWM inverter with a high frequency link, the simplest single-ended edge-resonant soft switching sinewave inverter with a sinewavc duty cycle pulse control scheme is Implemented, resulting in size and weight reduction, low cost and high efficiency This paper presents a prototype system of the sinewave zero voltage soft switching sinewave inverter for solar power conditioner, along with its operating principle and unique features In addition to these, this paper discusses a control implementation to deliver high quality output current. Major design of each component and the power loss analysis under actual power processing is also discussed and evaluated from an experimental point of view A newly developed utility-connected sinewave power conditioning circuit which achieves 92 5% efficiency under 4kW output is demonstrated
Koki Ogura,Srawouth Chandhaket,Tarek Ahmed,Mutsuo Nakaoka 전력전자학회 2004 JOURNAL OF POWER ELECTRONICS Vol.4 No.1
This paper presents a high-frequency ZVS-PWM boost chopper-fed DC-DC converter with a single active auxiliary edge resonant snubber in the load-side which can be designed for power conditioners such as solar photovoltaic generation, fuel cell generation, battery and super capacitor energy storages its principle operation in steady-state is described in addition to a prototype setup. The experimental results of ZVS-PWM boost chopper-fed DC-DC converter proposed here, are evaluated and verified with a practical design model in terms of its switching voltage and current waveforms, the switching V-I trajectory, the temperature performance of IGBT module, the actual power conversion efficiency and the EMI of radiated and conducted emissions. And then discussed and compared with the hard switching scheme from an experimental point of view Finally, this paper proposes a practical method to suppress parasitic oscillation due to the active auxiliary resonant switch at ZCS turn off mode transition with the aid of an additional lossless clamping diode loop, and reduced the EMI conducted emission in this paper.
Ogura, Koki,Chandhaket, Srawouth,Nakaoka, Mutsuo,Terai, Haruo,Sumiyoshi, Shinichiro,Kitaizumi, Takeshi,Omori, Hideki The Korean Institute of Power Electronics 2002 JOURNAL OF POWER ELECTRONICS Vol.2 No.3
The utility interfaced sinewave modulation Inverter for the solar photovoltaic power conditioner with a high frequency transformer is presented for residential applications. As compared with the conventional full-bridge hard switching slnewave PWM inverter with a high frequency link, the simplest single-ended edge-resonant soft switching sinewave inverter with a sinewave duty cycle pulse control scheme is implemented, resulting in size and weight reduction, low cost and high efficiency This paper presents a prototype system of the sinewave zero voltage soft switching sinewave inverter for solar power conditioner, along with its operating principle and unique features. In addition to these, this paper discusses a control implementation to deliver high quality output current. Major design of each component and the power loss analysis under actual power processing is also discussed and evaluated from an experimental point of view A newly developed utility-connected sinewave power conditioning circuit which achieves 92.5% efficiency under 4kW output is demonstrated.
Ogura, Koki,Chandhaket, Srawouth,Ahmed, Tarek,Nakaoka, Mutsuo The Korean Institute of Electrical Engineers 2003 KIEE International Transactions on Electrical Mach Vol.b3 No.3
This paper presents a high-frequency boost type ZVS-PWM chopper-fed DC-DC power converter with a single active auxiliary edge-resonant snubber at the load stage which can be designed for power conditioners such as solar photovoltaic generation, fuel cell generation, battery and super capacitor energy storages. Its principle operation in steady-state is described in addition to a prototype setup. The experimental results of boost type ZVS-PWM chopper proposed here, are evaluated and verified with a practical design model in terms of its switching voltage and current waveforms, the switching v-i trajectory and the temperature performance of IGBT module, the actual power conversion efficiency, and the EMI of radiated and conducted emissions, and then discussed and compared with the hard switching scheme from an experimental point of view. Finally, this paper proposes a practical method to suppress parasitic oscillation due to the active auxiliary resonant switch at ZCS turn-off mode transition with the aid of an additional lossless clamping diode loop, and can be reduced the EMI conducted emission.
Koki Ogura,Tomomasa Nishida,Osamu Noro,Mutsuo Nakaoka,Hyun-Woo Lee 전력전자학회 2004 ICPE(ISPE)논문집 Vol.- No.-
This paper presents a novel prototype circuit topology with dual mode control scheme of a high efficiency time-sharing single-phase sinewave PWM inverter for small scale new energy power generation system, which is composed of partially controlled sinewave absolute PWM boost chopper in the first power processing stage as well as partially controlled sinewave PWM full-bridge inverter in the second power processing stage. Its unique operating principle of two power processing stage with time-sharing dual mode sinewave<br/> modulation strategy is described in addition to an implemented example. Finally, this new conceptual single-phase sinewave<br/> PWM inverter with sinewave absolute PWM controlled boost chopper is evaluated and discussed on the basis of simulation and experimental results. The effectiveness of proposed power conditioner is proved from a practical point of view.
Ogura, Koki,Chandhaket, Srawouth,Ahmed, Tarek,Nakaoka, Mutsuo The Korean Institute of Power Electronics 2004 JOURNAL OF POWER ELECTRONICS Vol.4 No.1
This paper presents a high-frequency ZVS-PWM boost chopper-fed DC-DC converter with a single active auxiliary edge resonant snubber in the load-side which can be designed for power conditioners such as solar photovoltaic generation, fuel cell generation, battery and super capacitor energy storages. Its principle operation in steady-state is described in addition to a prototype setup. The experimental results of ZVS-PWM boost chopper-fed DC-DC converter proposed here, are evaluated and verified with a practical design model in terms of its switching voltage and current waveforms, the switching v-i trajectory, the temperature performance of IGBT module, the actual power conversion efficiency and the EMI of radiated and conducted emissions. And then discussed and compared with the hard switching scheme from an experimental point of view. Finally, this paper proposes a practical method to suppress parasitic oscillation due to the active auxiliary resonant switch at ZCS turn off mode transition with the aid of an additional lossless clamping diode loop, and reduced the EMI conducted emission in this paper.
Mantaro Nakamura,Koki Ogura,Mutsuo Nakaoka 전력전자학회 2004 JOURNAL OF POWER ELECTRONICS Vol.4 No.3
This paper presents a new circuit topology of high-frequency soft switching commutation boost type PWM chopper-fed DC-DC power converter with a loadside auxiliary passive resonant snubber. In the proposed boost type chopper-fed DC-DC power converter circuit operating under a principle of ZCS turn-on and ZVS turn-off commutation, the capacitor and inductor in the auxiliary passive resonant circuit works as the lossless resonant snubber. In addition to this, the voltage and current peak stresses of the power semiconductor devices as well as their di/dt or dv/dt dynamic stress can be effectively reduced by the single passive resonant snubber treated here. Moreover, it is proved that chopper-fed DC-DC power converter circuit topology with an auxiliary passive resonant snubber could solve some problems on the conventional boost type hard switching PWM chopper-fed DC-DC power converter. The simulation results of this converter are illustrated and discussed as compared with the experimental ones. The feasible effectiveness of this soft switching DC-DC power converter with a single passive resonant snubber is verified by the 5kW, 20kHz experimental breadboard set up to be built and tested for new energy utilization such as solar photovoltaic generators and fuel sell generators.
Enhui Chu,Koki Ogura,Serguei Moisseev,Atsushi Okuno,Mutsuo Nakaoka 전력전자학회 2001 ICPE(ISPE)논문집 Vol.2001 No.10
A variety of high voltage DC power supplies employing the high frequency inverter are difficult to achieve soft switching considering a quick response and no overshoot response under the wide load variation ranges which are used in medical-use x-ray high voltage generator from 20kV to 150kV in the output voltage and from 0.5mA to 1250mA, respectively The authors develops soft switching high voltage DC power supply designed for x-ray power generator applications, which uses series resonant inverter circuit topology with a multistage voltage multiplier instead of a conventional high voltage diode rectifier connected to the second-side of a high-voltage transformer with a large turn ratio A constant on-time dual mode frequency control scheme operating under a principle of zero-current soft switching commutation is described. Introducing the multistage voltage multiplier, the secondary transformer turn-numbers and stray capacitance of high-voltage transformer is effective to be greatly reduced It is proved that the proposed high-voltage converter topology with dual mode frequency modulation mode control scheme is able to be the transient response and steady-state performance in high-voltage x-ray tube load The effectiveness of this high voltage converter is evaluated and discussed on the basis of simulation analysis and observed data in experiment.<br/>
Kazuhiro Shiraishi,Koki Ogura,Mantaro Nakamura,Yuma Fujii,Eiji Hiraki,Hyun Woo Lee,Mutsuo Nakaoka 전력전자학회 2004 ICPE(ISPE)논문집 Vol.- No.-
This paper presents an advanced circuit topology and optimum gate pulse patterns for the voltage source bridge type soft-switching(S-SW) sinewave PWM inverter, which incorporates a novel active auxiliary bridge commutation leg, associated quasi-resonant snubbers. In this voltage source type sinewave PWM inverter, all the main power switches and the auxiliary power switches can achieve the zero voltage soft-switching (ZVS) or the zero current soft-switching (ZCS). The complete S-SW commutation is possible only by determining the gate pulse pattern timing of the main switches and the auxiliary switches, and circuit parameters. The special resonant current and the current and voltage sensor control circuit to achieve S-SW commutation are not necessary for<br/> these resonant snubbers. In addition, the optimum gate pulse pattern to minimize the power losses of the resonant snubber treated here.