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RISS 인기검색어
- 검색키워드
- 저자 : Koji Orikawa (검색결과 5 건)
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Minimum Flying Capacitor for N-level Capacitor DC/DC Boost Converter
Asmarashid Ponniran,Koji Orikawa,Jun-ichi Itoh 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
This paper proposes a Flying Capacitor DC/DC Boost Converter (FCBC) with a small capacitance of the flying capacitor. As a result the size and weight of the proposed converter can be reduced. The capacitance of the flying capacitor is designed based on switching device voltage rating and regardless of the output voltage ripple influences. Moreover, the achieved maximum efficiency of the designed 3-level FCBC is 98.5% at the output power of 1kW. Finally, the effectiveness of small capacitances of the flying capacitor in the 3-level and 5-level FCBCs are investigated. The characteristics of the distorted voltage across an input voltage source and an input inductor and the distorted current to the output side which is an output capacitor and a load are investigated with several capacitances of the flying capacitors for 3-level and 5-level FCBCs. As a result, it is experimentally confirmed that the distortion of the voltage across the input voltage source and the input inductor is drastically reduced by increasing the number of level. On the other hand, the distortion of the current to the output side which is the output capacitor and the load is almost same even the number of level is increased. Therefore, the experimental results show that small capacitance of the flying capacitor can be used in the n-level FCBC.
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Soonhwan Hwang,Satoshi Ogasawara,Koji Orikawa,Masatsugu Takemoto 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
This paper proposes an interleaved AC/DC buckboost converter with active power decoupling(APD) using the modular design method. It also introduces the control method using the sliding mode control (SMC) strategy for the proposed circuit. The contribution of this paper was first proposed by AC/DC Interleaved Converter circuits with APD functions, which allowed the size of input filters and magnetic cores to be reduced. Additionally, we have applied SMC strategies to the control system to be robust for the disturbance or model uncertainty. The effectiveness of the proposed circuit and control method is shown by simulations using MATLAB/SIMULINK.
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Current Source Gate Drive Circuits with Low Power Consumption for High Frequency Power Converters
Ayato Sagehashi,Keisuke Kusaka,Koji Orikawa,Jun-ichi Itoh 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
In this paper, three types of the gate drive circuits; voltage source, current source with continuous current and current source with discontinuous current gate drive circuits are compared from the view point of power consumption of the three types of the gate drive circuits and the switching loss of the main MOSFET. It is confirmed that the power consumption of the gate drive circuit is reduced by 56.4% using the current source gate drive circuit with discontinuous current source compared with that of the voltage source gate drive circuit by a switching test at the switching frequency of 1 MHz. Secondary, the switching loss of the main MOSFET is evaluated by experiment. The turn on and the turn off losses are 1.34 W and 1.76 W when the conventional voltage source gate drive circuit. On the other hand, the turn on and the turn off losses are 1.4W and 1.54W. The turn on loss and the turn off loss are almost same value because the input peak current of the conventional voltage source gate drive circuit and the input reactor peak current of the current source gate drive circuit with discontinuous current are same. Therefore, the current source gate drive circuit with discontinuous current can be used without increasing the switching loss of the main MOSFET similar to the conventional voltage source gate drive circuit. That is because the rise time and the fall time of the gate voltage on main MOSFET is same time.
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Kanako Tsushima,Satoshi Ogasawara,Koji Orikawa,Masatsugu Takemoto,Kenji Koyama 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
This paper deals with electromagnetic interference radiated from air-conditioner piping that acts as an antenna and emits electromagnetic noise. The current distribution on the piping is measured by using a near-field magnetic probe, and the distribution mode is analyzed. The results show that the piping resonates at the frequencies where the piping length accords with λ/4, 3λ/4, and 5λ/4, and radiates electromagnetic noise as a monopole antenna. This radiation mechanism is confirmed by simulations using the CST EMC Studio electromagnetic field simulator.
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Reduction of a Boost Inductance using a Switched Capacitor DC-DC Converter
Jun-ichi Itoh,Koichi Matsuura,Koji Orikawa 전력전자학회 2011 ICPE(ISPE)논문집 Vol.2011 No.5
The loss analysis of a switched capacitor converter (SCC) with a boost reactor is discussed in this paper. The proposed SCC can deliver an output voltage independent from the circuit structure comparing to other voltage control methods. The main feature of this circuit is that most of the energy for the boost up function is transferred from a flying capacitor which results the inductance of the input reactor can be reduced. The reactor size of the proposed SCC is smaller than that of the conventional boost converters. A 1000 W 3-level SCC prototype has been built and tested. The efficiency of 97.8% is achieved at 1000 W when the boost up ratio is three times. Moreover, the loss analysis shows the main loss of the proposed SCC is the diode conduction loss.
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