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Papers by Masayoshi Yamamoto
Ingeniería e Investigación, 2016
With the purpose of designing the electric powertrain of a high performance electric vehicle capa... more With the purpose of designing the electric powertrain of a high performance electric vehicle capable of running a quarter mile in 10 seconds, firstly it is necessary to calculate the required energy, torque, and power in order to size and select the suitable storage components and electric motors. Secondly, an assessment of the powertrain arrangement is needed to choose the best internal configuration of the vehicle and guarantee the highest efficiency possible. Finally, a design of the power conversion stages, specifically the DC-DC converter that interfaces the storage unit with the electric motors, is required as well. This paper shows the energy calculation procedure based on a longitudinal dynamic model of the vehicle and the selection method of the storage components and motors needed for this application, as well as the design of two 100kW interleaved boost converters with coupled inductors. In addition, a novel operation of the interleaved boost converter is proposed in orde...
2015 IEEE Workshop on Power Electronics and Power Quality Applications (PEPQA), 2015
Journal of Japan Institute of Electronics Packaging, 2015
Electrical Engineering in Japan
IEEJ Transactions on Industry Applications
ABSTRACT This paper presents a novel prototype of 3-level 3-phase voltage-fed soft switching comm... more ABSTRACT This paper presents a novel prototype of 3-level 3-phase voltage-fed soft switching commutation inverter with two Active Auxiliary Resonant DC Link (ARDCL) snubbers which can operate under a condition of Zero Voltage Switching (ZVS) transition. Its operating principle is described herein. The feasible steady-state performances of the proposed soft switching commutated inverter using the latest IGBTs such as planner type and trench type IGBTs, which is more suitable for power systems applications, are evaluated and discussed on the basis of its experimental results and simulation ones.
2009 13th European Conference on Power Electronics and Applications, Sep 1, 2009
Ieej Transactions on Industry Applications, 2004
2011 IEEE Energy Conversion Congress and Exposition, 2011
2013 2nd International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST), 2013
Proceedings of Second International Conference on Power Electronics and Drive Systems, May 26, 1997
2015 IEEE Energy Conversion Congress and Exposition (ECCE), 2015
2007 Power Conversion Conference - Nagoya, 2007
2015 9th International Conference on Power Electronics and ECCE Asia (ICPE-ECCE Asia), 2015
High step-up converters are widely used in sustainable energy systems and recently used in automo... more High step-up converters are widely used in sustainable energy systems and recently used in automotive applications due to their high voltage gain capability. Nevertheless, with the purpose of obtaining a higher voltage gain, in comparison with conventional boost converters, current high step-up converters often employ additional multiplier cells, which may lead to significant cost-up and low power density. Therefore, a novel two-phase interleaved high step-up converter is proposed in order to minimize additional circuit volume used to achieve large voltage gain. The proposed converter addresses the purpose by a particular coupled inductor where three windings are installed in one or two cores. As a result, the proposed converter can achieve higher voltage gain than the conventional topologies by adding a winding and two diodes to the interleaved two phase boost chopper, besides the coupled-inductor configuration. This paper evaluates two arrangements of the coupled-inductor configuration of the proposed high step-up converter: 1. Three windings integrated in only one core and 2. Two independent inductors with a shared winding. The result revealed that the proposed converter shows higher voltage gain than the normal boost converter and the magnetic integration in the coupled-inductor configuration further increases the voltage gain by 20%.
IECON 2012 - 38th Annual Conference on IEEE Industrial Electronics Society, 2012
2012 IEEE Energy Conversion Congress and Exposition (ECCE), 2012
A novel integrated magnetic structure suitable for the transformer-linked interleaved boost chopp... more A novel integrated magnetic structure suitable for the transformer-linked interleaved boost chopper circuit is proposed in this paper. The coupled inductor is known to be effective for miniaturization in high coupling area because the DC flux in the core can be canceled and the inductor current ripple become to high frequency. However, coupled inductor with E-E core and E-I core are realistically difficult to obtain necessary leakage inductance in high coupling area. The cause is fringing effect and the effects leads to complication of magnetic design. To solve this problem, novel integrated magnetic structure with reduction of fringing flux and high frequency ripple current performance, is proposed. Furthermore, the design method for novel integrated magnetic structure suitable for coupled inductor is proposed from analyzing of the magnetic circuit model. Finally, effectiveness of reduction of fringing flux and design method for novel coupled inductor are discussed from experimental point of view.
2012 International Conference on Renewable Energy Research and Applications (ICRERA), 2012
Ingeniería e Investigación, 2016
With the purpose of designing the electric powertrain of a high performance electric vehicle capa... more With the purpose of designing the electric powertrain of a high performance electric vehicle capable of running a quarter mile in 10 seconds, firstly it is necessary to calculate the required energy, torque, and power in order to size and select the suitable storage components and electric motors. Secondly, an assessment of the powertrain arrangement is needed to choose the best internal configuration of the vehicle and guarantee the highest efficiency possible. Finally, a design of the power conversion stages, specifically the DC-DC converter that interfaces the storage unit with the electric motors, is required as well. This paper shows the energy calculation procedure based on a longitudinal dynamic model of the vehicle and the selection method of the storage components and motors needed for this application, as well as the design of two 100kW interleaved boost converters with coupled inductors. In addition, a novel operation of the interleaved boost converter is proposed in orde...
2015 IEEE Workshop on Power Electronics and Power Quality Applications (PEPQA), 2015
Journal of Japan Institute of Electronics Packaging, 2015
Electrical Engineering in Japan
IEEJ Transactions on Industry Applications
ABSTRACT This paper presents a novel prototype of 3-level 3-phase voltage-fed soft switching comm... more ABSTRACT This paper presents a novel prototype of 3-level 3-phase voltage-fed soft switching commutation inverter with two Active Auxiliary Resonant DC Link (ARDCL) snubbers which can operate under a condition of Zero Voltage Switching (ZVS) transition. Its operating principle is described herein. The feasible steady-state performances of the proposed soft switching commutated inverter using the latest IGBTs such as planner type and trench type IGBTs, which is more suitable for power systems applications, are evaluated and discussed on the basis of its experimental results and simulation ones.
2009 13th European Conference on Power Electronics and Applications, Sep 1, 2009
Ieej Transactions on Industry Applications, 2004
2011 IEEE Energy Conversion Congress and Exposition, 2011
2013 2nd International Conference on Electric Power Equipment - Switching Technology (ICEPE-ST), 2013
Proceedings of Second International Conference on Power Electronics and Drive Systems, May 26, 1997
2015 IEEE Energy Conversion Congress and Exposition (ECCE), 2015
2007 Power Conversion Conference - Nagoya, 2007
2015 9th International Conference on Power Electronics and ECCE Asia (ICPE-ECCE Asia), 2015
High step-up converters are widely used in sustainable energy systems and recently used in automo... more High step-up converters are widely used in sustainable energy systems and recently used in automotive applications due to their high voltage gain capability. Nevertheless, with the purpose of obtaining a higher voltage gain, in comparison with conventional boost converters, current high step-up converters often employ additional multiplier cells, which may lead to significant cost-up and low power density. Therefore, a novel two-phase interleaved high step-up converter is proposed in order to minimize additional circuit volume used to achieve large voltage gain. The proposed converter addresses the purpose by a particular coupled inductor where three windings are installed in one or two cores. As a result, the proposed converter can achieve higher voltage gain than the conventional topologies by adding a winding and two diodes to the interleaved two phase boost chopper, besides the coupled-inductor configuration. This paper evaluates two arrangements of the coupled-inductor configuration of the proposed high step-up converter: 1. Three windings integrated in only one core and 2. Two independent inductors with a shared winding. The result revealed that the proposed converter shows higher voltage gain than the normal boost converter and the magnetic integration in the coupled-inductor configuration further increases the voltage gain by 20%.
IECON 2012 - 38th Annual Conference on IEEE Industrial Electronics Society, 2012
2012 IEEE Energy Conversion Congress and Exposition (ECCE), 2012
A novel integrated magnetic structure suitable for the transformer-linked interleaved boost chopp... more A novel integrated magnetic structure suitable for the transformer-linked interleaved boost chopper circuit is proposed in this paper. The coupled inductor is known to be effective for miniaturization in high coupling area because the DC flux in the core can be canceled and the inductor current ripple become to high frequency. However, coupled inductor with E-E core and E-I core are realistically difficult to obtain necessary leakage inductance in high coupling area. The cause is fringing effect and the effects leads to complication of magnetic design. To solve this problem, novel integrated magnetic structure with reduction of fringing flux and high frequency ripple current performance, is proposed. Furthermore, the design method for novel integrated magnetic structure suitable for coupled inductor is proposed from analyzing of the magnetic circuit model. Finally, effectiveness of reduction of fringing flux and design method for novel coupled inductor are discussed from experimental point of view.
2012 International Conference on Renewable Energy Research and Applications (ICRERA), 2012
IEEJ Transactions on Industry Applications
In recent years, a resonant snubber to minimize switching power losses and EMI noises have attrac... more In recent years, a resonant snubber to minimize switching power losses and EMI noises have attracted special interest for the voltage-fed soft switching sinewave PWM inverters and active rectifiers. The authors have discussed the performance evaluations on lower noise and high efficiency for two switch auxiliary resonant DC link snubber assisted three-phase voltage-fed soft switching PWM inverter. It was proved that cost effective three phase soft switching inverter treated here is able to improve both efficiency and EMI noise. However, some practical problems to be improved have recognized for the soft-switching three phase PWM inverter treated here from a practical point of view. This three phase soft-switching inverter with two switch type auxiliary resonant DC link snubber has significant disadvantages of DC busline link voltage reduction for the existence of the zero voltage mode transition period as well as the larger size and physical volume of electrolytic capacitor incorpor...