Masayoshi Yamamoto, Shinji Sato, EijiHiraki, and MutsuoNakaoka, “Auxiliary Resonant Commutated Leg Snubber Linked 3-Level 3-Phase Voltage Source Soft-Switching Inverter”, KIPE International Transactions of Power Electronics, Vol. 3, No. 2, pp. 90-98 (2003)
Masayoshi Yamamoto, Shinji Sato, Tarek Ahmed, EijiHiraki, Hyun Woo Lee, and MutsuoNakaoka, “Three-Phase Current Source Type ZVS-PWM Controlled PFC Rectifier with Single Active Auxiliary Resonant Snubber and Its Feasible Evaluations”, KIEE International Transactions on Electrical Machinery and Energy Conversion Systems, Vol. 4, No. 3, pp. 127-133 (2004)
Jun Imaoka, Masayoshi Yamamoto, Yuta Nakamura, and Takahiro Kawashima, “Analysis of Output Capacitor Storage Charge in Multi-phase Transformer-Linked Boost Chopper Circuit”, IEEJ Journal of Industry Applications, Vol. 2, No. 5, pp. 252-260 (2013)
Fumiya Hattori, HirokatsuUmegami, and Masayoshi Yamamoto, “A Capacitor-less Gate Drive Circuit Capable of High-Efficiency Operation for Non-Insulating-Gate GaNFETs”, IEEE Transactions on Electron Devices, Vol. 60, No. 10, pp. 3249-3255 (2013)
HirokatsuUmegami, Fumiya Hattori, Yu Nozaki, Masayoshi Yamamoto, and Osamu Machida, “A Novel High Efficiency Gate Drive Circuit for Normally Off Type GaNFET”, IEEE Transaction on Industry Applications, Vol. 50, No. 1, pp. 593-599 (2014)
HirokatsuUmegami, Akihiro Nishigaki, Fumiya Hattori, and Masayoshi Yamamoto, “Investigation of False Triggering Mechanism”, IEEJ Transactions on Electrical and Electronic Engineering, Vol. 9, No. 1, pp. 102-104 (2014)
Jun Imaoka, Shota Kimura, Wilmar Martinez, and Masayoshi Yamamoto, “A Novel Integrated Magnetic Core Structure Suitable for Transformer-linked Interleaved Boost chopper Circuit”, IEEJ Journal of Industry Applications, Vol. 3, No. 5, pp. 395-404 (2014)
Wilmar Martinez, Jun Imaoka, Masayoshi Yamamoto, and Kazuhiro Umetani, “Parasitic Resistance Analysis in a Novel High Step-Up Interleaved Converter for Hybrid Electric Vehicles”, JIPE-Power Electronics Journal, Vol. 40, pp. 93-104 (2014)
Jun Imaoka, Masayoshi Yamamoto, and Takahiro Kawashima, “High Power Density Three-phase Interleaved Boost Converter with a Novel Coupled Inductor”, IEEJ Journal of Industry Applications, Vol. 4, No. 1, pp. 20-30 (2015)
Kazuhiro Umetani, Jun Imaoka, and Masayoshi Yamamoto, “Evaluation of the LagrangianMethod for Deriving Equivalent Circuits of Integrated Magnetic Components: A Case Study Using the Integrated Winding Coupled Inductor”, IEEE Transaction on Industry Applications, Vol. 51, No. 1, pp. 547-555 (2015)
Jun Imaoka, Shota Kimura, Yuki Itoh, Wilmar Martinez, Masayoshi Yamamoto, Michiaki Suzuki, and Kenji Kawano, “Feasible Evaluations of Coupled Multilayer Chip Inductor for POL Converters”, IEEJ Journal of Industry Applications, Vol. 4, No. 3, pp. 126-135 (2015)
Wilmar Martinez, Jun Imaoka, KimihiroNanamori, Masayoshi Yamamoto, and Takahiro Kawashima, “Recovery-Less Boost Converter with Saturable Inductor for Electric Vehicle Applications”, 電気学会部門誌D, Vol. 135, No. 9, pp. 914-921 (2015)
Kazuhiro Umetani, Masayoshi Yamamoto, and EijiHiraki, “Lagrangian-Based Derivation of a Novel Sliding-Mode Control for Synchronous Buck Converters”, IEEJ Journal of Industry Applications, Vol. 4, No. 6, pp. 728-729 (2015)
HirokatsuUmegami, Kazuhiro Umetani, Masayoshi Yamamoto, and EijiHiraki, “Lagrangian-based Equivalent Circuit of Basic Electric-Field Coupling Wireless Power Transfer System”, IEEJ Transactions on Electrical and Electronic Engineering, Vol. 11, No. S1, pp. S168-S170 (2015)
Kazuhiro Umetaniand Masayoshi Yamamoto, “Simple Flux-based LagrangianFormulation to Model the Non-linearity of Concentrated-winding Switched Reluctance Motors”, IET Electronics Letters, Vol. 51, pp. 1984-1986 (2015)
Jun Imaoka, Wilmar Martinez, and Masayoshi Yamamoto, “Coupling Coefficient Improvement and Electromagnetic Induced Noise Reduction using Short-Circuited Winding for a Loosely Coupled Inductor”, IEEJ Journal of Industry Applications, Vol. 5, No. 2, pp. 174-175 (2016)
Jun Imaoka, Kazuhiro Umetani, Shota Kimura, Wilmar Martinez, Masayoshi Yamamoto, SeikohArimura, and Tetsuo Hirano, “Magnetic Analysis, Design and Experimental Evaluations for Integrated Winding Coupled Inductor in Interleaved Converters”, IEEJ Journal of Industry Applications, Vol. 5, No. 3, pp. 276-288 (2016)
Shota Kimura, Yuki Itoh, Wilmar Martinez, Masayoshi Yamamoto, and Jun Imaoka, “Downsizing Effects of Integrated Magnetic Components in High Power Density DC-DC Converters for EV and HEV Applications”, IEEE Transaction on Industry Applications, Vol. 52, No. 4, pp. 3294-3305 (2016)
HirokatsuUmegami, Hiroki Ishibashi, KimihiroNanamori, Fumiya Hattori, and Masayoshi Yamamoto, “Basic Analysis of False Turn-on Phenomenon of Power Semiconductor Devices with Parasitic Inductances”, IET Electronics Letters, Vol. 52, No. 13, pp. 1158–1160 (2016)
Masato Sasaki, HirokatsuUmegami, and Masayoshi Yamamoto, “SiCSBDs Selection Method based on Loss Analysis of Boost Converter”, IEEJ Transactions on Electrical and Electronic Engineering, Vol. 11, No. S2, pp.S144-S145 (2016).
MasatakaIshihara, Kazuhiro Umetani, HirikatsuUmegami, EijiHiraki, and Masayoshi Yamamoto, “Quasi-Duality between SS and SP Topologies of Basic Electric-Field Coupling Wireless Power Transfer System”, IET Electronics Letters, Vol. 52, No. 25, pp. 2057–2059 (2016)
Fumiya Hattori, HirokatsuUmegami, and Masayoshi Yamamoto, “A Multi-Resonant Gate Drive Circuit of Isolating-Gate GaNHEMTs for Tens of MHz”, IET Circuits, Devices & Systems, 53 pp (採択決定)
Martínez, W., Cortes, C. A., Munoz, L. E., and Yamamoto, M.,“Designof a 200 kW electric powertrain for a high performance electric vehicle”, Ingenieríae InvestigaciónJournal, 36(3), pp. 66–73 (2016)
H. Kawai, S. Yagi, S. Hirata, F. Nakamura, T. Saito, Y. Kamiyama, M. Yamamoto, H. Amano, V. Unni, and E. M. S. Narayanan,“Lowcost high voltage GaNpolarization super junction field effect transistors”, Phys. Status Solidi A, 1600834, (2017)
Jun Imaoka, KenkichiroOkamoto, Shota Kimura, Wilmar Martinez, Mostafa Noah, Masayoshi Yamamoto and Masahito Shoyama,“A Novel Design Method Considering DC-Biased Magnetization for Integrated Magnetic Components Used in Multi-phase DC/DC Converters”, IEEE Transactions on Power Electronics, DOI: 10.1109/TPEL.2017.2707385 (採択決定)
Shota Kimura, KimihiroNanamori, TaichiKawakami, Jun Imaokaand Masayoshi Yamamoto,“AllowablePower Analysis and Comparison for High Power Density DC-DC Converters with Integrated Magnetic Components”, IEEJ Journal of Industry Applications, Vol. 6, No. 6, 2017 (採択決定)
Wilmar Martinez, Camilo Cortes, Jun Imaoka, Kazuhiro Umetani, and Masayoshi Yamamoto, “Total Volume Evaluation of High Power Density Non-Isolated DC-DC Converters with Integrated Magnetics for Electric Vehicles”, IET Power Electronics, PEL-2017-0157.R1, 2017. (採択決定)
Toshihiro Iwaki, SeiyaIshiwaki, Takashi Sawada and Masayoshi Yamamoto, “Mathematical Analysis of GaNHEMT False Turn-On Phenomenon”, IET Electronics Letters, Volume 53, Issue 19, pp. 1286, 2017.
Masato Sasaki and Masayoshi Yamamoto,“LossAnalysis Based on Constant Gate Current for MOSFET Selection of CCM Boost Converter”, IEEJ Transactions on Electrical and Electronic Engineering, Vol. 12, No. S2, pp.S1390140 (2017).
Mostafa Noah, Kazuhiro Umetani, Jun Imaoka, and Masayoshi Yamamoto,”LagrangianDynamics Model and Practical Implementation of an Integrated transformer in Multi-phase LLC Resonant Converter”, IET Power Electronics, Vol:11, Issue:2, Page: 339-347. February 2018.
Mostafa Noah, Shun Endo, Hiroki Ishibashi, KimihiroNanamori, Jun Imaoka, Kazuhiro Umetaniand Masayoshi Yamamoto, “A Current Sharing Method Utilizing Balancing Transformer for a Multiphase LLC Resonant Converter with Integrated Magnetics” IEEE Journal of Emerging and Selected Topics on Power Electronics, Volume:6, Issue:2, Page:977-992, June 2018.
Mostafa Noah, Kazuhiro Umetani, Masayoshi Yamamoto, and Jun Imaoka, “Winding Orientation Method to Minimisethe Secondary Leakage of a Gapped Transformer Utilisedin LLC Resonant Converter” IET Electronics Letters, Volume: 54, Issue:3, Page:157-159.
KimihiroNanamori, Yusuke Sugihara and Masayoshi Yamamoto, “Oscillation Analysis and Current Peak Reduction in Paralleled SiCMOSFETs”, IET Circuits, Devices & Systems, Vol. 12, No. 4, pp.390-395, 2018.
Mostafa Noah, Shota Kimura, Jun Imaoka, Wilmar Martinez, Shun Endo, Masayoshi Yamamoto, and Kazuhiro Umetani, “Magnetic Design and Experimental Evaluation of a commercially available Single Integrated Transformer in Three-phase LLC Resonant Converter” IEEE Transactions on Industry Applications. (Accepted, in press).
International Conferences
M. Yamamoto, H. Hattori, E. Hiraki, and M. Nakaoka, “Digitally-Controlled Three-Phase Soft-Switching PFC Converter with Instantaneous Power Feedback Control Scheme”, in Proc. IEEE International Conference on Power Electronics & Drives and Energy System for Industrial Growth, Vol. 2, pp. 1002-1006 (1998)
M. Yamamoto, S. Hattori, E. Hiraki, M. Nakaoka, T. Horiuchi, and Y. Sugawara, “Three-Phase Voltage-Fed Space Voltage Vector Modulated Soft-Switching PFC Rectifier with Instantaneous Power Feedback Scheme”, in Proc. IEE-U K International Conference on Power Electronics and Variable Speed Drives, No. 456, pp. 92-98 (1998)
M. Yamamoto, M. Yoshida, T. Honda, H. Iwamoto, E. Hirano, S. Sugimoto, I. Kouda, and M. Nakaoka, “Feasible Performance Evaluations of 3 Level 3 Phase Voltage Source Soft-Switching Inverter using IGBT Modules”, in Proc. IEEE International Conference on Power Electronics and Drive Systems, Vol. 2, pp. 1084-1089 (1999)
M. Yamamoto, M. Yoshida, H. Iwamoto, E. Hiraki, S. Sugimoto, I. Kouda, and M. Nakaoka, “Three-Phase Voltage Source NPC Soft-Switching Inverter for Interactive Energy Storage Plants”, in Proc. IEEE 21th International Telecommunications Energy Conference, pp. 29/1-8 (1999)
M. Yamamoto, E. Hiraki, H. Iwamoto, S. Sugimoto, I. Kouda, and M. Nakaoka, “Voltage-Fed NPC Soft-Switching Inverter with New Space Voltage Vector Modulation Scheme”, in Proc. IEEE Industry Applications Society (IAS) Annual Meeting, Vol. 2, No. 26-5, pp. 1178-1185 (1999)
M. Yoshida, M. Yamamoto, E. Hiraki, S. Chandhaket, and M. Nakaoka, “Active Resonant Leg-Link Snubber-Assisted Three Phase Soft Commutation PFC Converter and Its Practical Evaluations”, in Proc. IEEE International Conference on Industrial Electronics, Control and Instrumentation, pp. 2660-2665 (2000)
Masayoshi Yamamoto, EijiHiraki, Shigeyuki Sugimoto, ShigeakiOgawa, and MutsuoNakaoka, “Feasible System Evaluations of 3-Phase Voltage Source NPC Soft-Switching Inverter with New Space Voltage Vector Modulation Strategy”, in Proc. IEEE International Conference on Industrial Electronics, Control and Instrumentation, pp. 977-982 (2000)
M. Yamamoto, E. Hiraki, Y. Konishi, and M. Nakaoka, “Auxiliary Resonant Commutated Snubber Linked 3-Level 3-Phase Voltage Source Soft-Switching Inverter”, in Proc. IEEE Industry Applications Society (IAS) Annual Meeting, 1455-1460 (2001)
M. Yamamoto, S. Sato, and M. Nakaoka, “A Novel Voltage Clamped Snubber Circuit Topology Applied for Multilevel Inverter and Its Low Power Loss Operations”, in Proc.10th International Conference on Power Electronics and Motion Control (EPE PEMC 2002), pp. 181 (2002)
M. Yamamoto, S. Sato, E. Hiraki, and M. Nakaoka, “Auxiliary Active Resonant Commutated Snubber-Assisted 3-Level 3-Phase Voltage Source Soft Switching Inverter”, in Proc. IEEE International Power Conversion Conference-Osaka, pp. 1245-1250 (2002)
Shinji Sato, Yutaka Suehiro, Masayoshi Yamamoto, and MutsuoNakaoka, “High Power-Factor 3-Phase PWM Rectifier”, in Proc. IEEE 24th International Telecommunications Energy Conference, pp. 303-308 (2002)
Shin-ichiroNagai, Shinji Sato, Masayoshi Yamamoto, and MutsuoNakaoka, “Noise Evaluation, Two Switch Resonant DC Link-Assisted Double Converter System and Commutation Control to Improve Loss”, in Proc. IEEE International Conference on Industrial Electronics, Control and Instrumentation, pp. 2705-2710 (2002)
Shin-ichiroNagai, Shinji Sato, Masayoshi Yamamoto, Hisashi Iyomori, and MutsuoNakaoka, “High Efficient Two Switch Auxiliary Resonant DC Link Three-Phase PWM Inverter and Two Switch Auxiliary Resonant Commutated Bridge Leg Link Three-Phase PWM Rectifier”, in Proc. IEEE International Conference on Industrial Electronics, Control and Instrumentation, pp. 403-407 (2003)
KouheiImai, Takahiro Kawashima, Shigeyuki Funabiki, Masayoshi Yamamoto, and Mamoru Tsuruya, “High Efficiency Low Noise SMPS System -Single Phase PFC Rectifier Side-”, in Proc. IEEE International Power Conversion Conference-Nagoya, pp. 377-383 (2007)
Akira Hashizaka, Hiroyuki Oka, MantaroNakamura, Shigeyuki Funabiki, Masayoshi Yamamoto, Shinichiro Nagai, and Mamoru Tsuruya, “High Efficiency Low Noise SMPS System -DC-DC Converter Side-”, in Proc. The 4th Power Conversion Conference, pp. 1230-1235 (2007)
Masayoshi Yamamoto, HisanoriMorii, and Shigeyuki Funabiki, “Capacitor-Less Auxiliary Resonant Commutated Pole (ARCP) Voltage Source Soft Switching Inverter suitable for EV”, Records of the 13th European Conference on Power Electronics and Applications, pp. 1-8 (2009) (CD-ROM)
Masayoshi Yamamoto, Takahiro Kawashima, and Shigeyuki Funabiki, “Trans-Linked Recovery-Less Boost Converter”, Records of the 13th European Conference on Power Electronics and Applications, pp. 1-10 (2009) (CD-ROM)
Masayuki Nakahama, Masayoshi Yamamoto, and Yuki Satake, “Trans-linked Multi-phase Boost Converter for Electric Vehicle”, in Proc. IEEE Energy Conversion Congress & Expo. (ECCE), pp. 2458-2463 (2010)
HirotakaToda, and Masayoshi Yamamoto, “1/3 Weight Core of A Capacitor-Less ARCP Method Three-Phase Voltage Source Soft-Switching Inverter suitable for EV”, in Proc. IEEE Energy Conversion Congress & Expo. (ECCE), pp. 4101-4106 (2011)
Jun Imaoka, Yuki Ishikura, Takahiro Kawashima, and Masayoshi Yamamoto, “Optimal Design Method for Interleaved Single-phase PFC Converter with Coupled Inductor”, in Proc. IEEE Energy Conversion Congress & Expo. (ECCE) , pp. 1807-1812 (2011)
Yuta Nakamura, and Masayoshi Yamamoto, “Optimal Control Design Method for Trans-Linked Type Multi-Phase Boost Converter”, in Proc. the 9th IEEE International Conference on Power Electronics and Drive Systems (IEEE-PEDS 2011), pp. 991-994 (2011)
Kenta Kono, Yuta Nakamura, and Masayoshi Yamamoto, “Optimal Design of Digital Control System for Interleaved Boost Chopper Circuit with the Coupled Inductor”, in Proc. the 9th IEEE International Conference on Power Electronics and Drive Systems (IEEE-PEDS 2011), pp. 995-998 (2011)
Tetsuya Watanabe, YuukiMachida, and Masayoshi Yamamoto, “A Hybrid Vehicle with Reversible Cell and Battery”, in Proc. the 9th IEEE International Conference on Power Electronics and Drive Systems (IEEE-PEDS 2011), pp. 593-595 (2011)
HirokatsuUmegami, Yu Nozaki, Masayoshi Yamamoto, and Osamu Machida, “A Novel High Efficiency Gate Drive Circuit for Normally Off Type GaN-FET”, in Proc. IEEE Energy Conversion Congress & Expo. (ECCE), pp. 2954-2960 (2012)
Jun Imaokaand Masayoshi Yamamoto, “A Novel Integrated Magnetic Structure suitable for Transformer-Linked Interleaved Boost chopper circuit”, in Proc. IEEE Energy Conversion Congress & Expo. (ECCE), pp. 3279-3284 (2012)
KenshiroKatsuraand Masayoshi Yamamoto, “Optimal Stability Control Method for Transformer-Linked Three-Phase Boost Chopper Circuit”, in Proc. IEEE Energy Conversion Congress & Expo. (ECCE), pp. 1082-1087 (2012)
Masayoshi Kobayashi and Masayoshi Yamamoto, “Current Balance Performance Evaluations for Transformer-Linked Three Phase DC-DC LLC Resonant Converter”, in Proc. International Conference on Renewable Energy Research and Applications (ICRERA), pp. 1-3 (2012)
YasukiKanazawa and Masayoshi Yamamoto, “A Novel Compact Single Phase Inverter using Transformer-Linked Interleaved FlybackConverter”, in Proc. International Conference on Renewable Energy Research and Applications (ICRERA), pp. 1-3 (2012)
KimihiroNanamori, Jun Imaoka, Kenta Kono, HideharuTsukamoto, and Masayoshi Yamamoto, “Verification of Novel Recovery-Less Boost Converter with Saturable Inductor”, in Proc. International Conference on Renewable Energy Research and Applications (ICRERA), pp. 1-3 (2012)
Shota Kimura, Jun Imaoka, and Masayoshi Yamamoto, “Potential Power Analysis and Evaluation for Interleaved Boost Converter with Close-Coupled Inductor”, in Proc. the 10th IEEE International Conference on Power Electronics and Drive Systems (IEEE-PEDS 2013), pp. 26-31 (2013)
Masayoshi Yamamoto, “Full SiCSoft Switching Inverter –Stability Performance for False Turn On Phenomenon”, in Proc. the 10th IEEE International Conference on Power Electronics and Drive Systems (IEEE-PEDS 2013), pp. 159-164 (2013) [Invited Paper]
Fumiya Hattori, HirokatsuUmegami, Takashi Yoshida, and Masayoshi Yamamoto, “Drive Loss Analysis and Comparison of Capacitor-Less Gate Drive Circuit for Gan FETs with Capacitor Type Gate Drive Circuits”, in Proc. the 10th IEEE International Conference on Power Electronics and Drive Systems (IEEE-PEDS 2013), pp. 1301-1305 (2013)
Kazuhiro Umetani, SeikohArimura, Tetsuo Hirano, Jun Imaoka, and Masayoshi Yamamoto, “Evaluation of the LagrangianMethod for Deriving Equivalent Circuits of Integrated Magnetic Components: A Case Study Using the Integrated Winding Coupled Inductor”, in Proc. IEEE Energy Conversion Congress & Expo. (ECCE), pp. 495-502 (2013)
Jun Imaoka, Kazuhiro Umetani, SeikohArimura, Tetsuo Hirano, and Masayoshi Yamamoto, “Characteristics Analysis and Performance Evaluation for Interleaved Boost Converter with Integrated Winding Coupled Inductor”, in Proc. IEEE Energy Conversion Congress & Expo. (ECCE), pp. 3711-3718 (2013)
Kenta Iwamoto, Kenshiro Katsura, Taiki Kato, and Masayoshi Yamamoto, “Stable Control Design of Average Current Mode Control for Multi-Phase Transformer-Linked Type Boost Chopper Circuit”, in Proc. IEEE Energy Conversion Congress & Expo. (ECCE), pp. 5395-5402 (2013)
Takashi Yoshida, Hirokatsu Umegami, Fumiya Hattori, Masayoshi Yamamoto, and Atsushi Yamaguchi, “Gate Drive Circuit For Normally On Type GaN FET”, Records of 2nd International Conference on Electric Power Equipment – Switching Technology (ICEPE-ST), (CD-ROM) (2013)
Shota Kimura, Jun Imaoka, and Masayoshi Yamamoto “Basic Investigation on Core Loss Calculation Method under Square Wave Voltage Magnetizing Condition”, Records of 2nd International Conference on Electric Power Equipment – Switching Technology (ICEPE-ST), (CD-ROM) (2013)
Jun Imaoka, Shota Kimura, Yuki Itoh, Masayoshi Yamamoto, Michiaki Suzuki, and Kenji Kawano, “Feasible Evaluations of Coupled Multilayer Chip Inductor for POL Converter”, in Proc. the 2014 International power Electronics conference-ECCE ASIA- (IPEC-Hiroshima 2014), pp. 883-890 (2014) [Invited Paper]
Fumiya Hattori, Jun Imaoka, Manabu Ishitobi, Shinichiroh Nagai, and Masayoshi Yamamoto, “Efforts for Power Electronics Education in A Start-Up Company”, in Proc. the 2014 International power Electronics conference -ECCE ASIA- (IPEC-Hiroshima 2014), pp. 811-816 (2014) [Invited Paper]
Yuki Itoh, Shota Kimura, Jun Imaoka, and Masayoshi Yamamoto, “Inductor Loss Calculation of Coupled Inductors for High Power Density Boost Converter”, in Proc. the 2014 International power Electronics conference -ECCE ASIA- (IPEC-Hiroshima 2014), pp. 2497-2502 (2014)
Wilmar Martinez, Shota Kimura, Jun Imaoka, Masayoshi Yamamoto, Kazuhiro Umetani, Tetsuo Hirano, and Seikoh Arimura, “High Power Density DC-DC Converter for Home Energy Management Systems”, in Proc. IEEE International Green Building and Smart Grid Conference – IGBSG, pp. 1-6 (2014) [Invited Paper]
Kazuhiro Umetani and Masayoshi Yamamoto, “Novel Method to Detect the DC Magnetizing Bias in Power Transformers Utilizing Local Flux Concentration”, in Proc. IEEE Energy Conversion Congress & Expo. (ECCE), pp. 3739-3746 (2014)
Shota Kimura, Shogo Aoto, Jun Imaoka, and Masayoshi Yamamoto, “Allowable Power Analysis for High Power Density DC-DC Converters using Integrated Magnetic Components”, in Proc. IEEE Energy Conversion Congress & Expo. (ECCE), pp. 5221-5228 (2014)
Shota Kimura, Jun Imaoka, and Masayoshi Yamamoto “Downsizing Effects with Allowable Power Analysis for High Power Density DC-DC Converters using Integrated Magnetic Components”, in Proc. IEEE Energy Conversion Congress & Expo. (ECCE), pp. 5761-5768 (2014)
Akihiro Nishigaki, Hirokatsu Umegami, Fumiya Hattori, Wilmar Martinez, and Masayoshi Yamamoto “An Analysis of False Turn On Mechanism on Power Devices”, in Proc. IEEE Energy Conversion Congress & Expo. (ECCE), pp. 2988-2993 (2014)
Masataka Ishihara, Takashi Yoshida, Humiya Hattori, and Masayoshi Yamamoto, “A Capacitor- less Gate Drive Circuit Using Two Parasitic Capacitors Suitable for Non-Insulating-Gate GaN FETs”, in Proc. IEEE Energy Conversion Congress & Expo. (ECCE), pp. 3212-3218 (2014)
Yuki Ito, Shota Kimura, Jun Imaoka, and Masayoshi Yamamoto, “Inductor Loss Analysis of Various Materials in Interleaved Boost Converters”, in Proc. IEEE Energy Conversion Congress & Expo. (ECCE), pp. 980-987 (2014)
Taichi Kawakami, Hirotaka Tanada, and Masayoshi Yamamoto, “Verification by Current Control of Multi-phase Transformer- Linked Type Boost Chopper Circuit Using Current Sensorless Method”, in Proc. IEEE Energy Conversion Congress & Expo. (ECCE), pp. 4960-4966 (2014)
Wilmar Martinez, Masayoshi Yamamoto, Petar Grbovic, and Camilo Cortes, “Efficiency Optimization of a Single-Phase Boost DC- DC Converter for Electric Vehicle Applications”, in Proc. 40th Annual Conference of the IEEE Industrial Electronics Society – IECON, pp. 1-6 (2014)
Wilmar Martinez, Jun Imaoka, Yuki Itoh, Masayoshi Yamamoto, and Kazuhiro Umetani, “Analysis of Coupled-Inductor Configuration for an Interleaved High Step-Up Converter”, in Proc. IEEE International Conference on Power Electronics – ICPE 2015-ECCE Asia, pp. 2591-2598 (2015)
Wilmar Martinez, Jun Imaoka, Shota Kimura, Masayoshi Yamamoto, and Camilo Cortes, “Volume Comparison of DC-DC Converters for Electric Vehicles”, in Proc. IEEE Workshop on Power Electronics and Power Quality Applications-PEPQA, pp. 1-6 (2015)
Wilmar Martinez, Jun Imaoka, and Masayoshi Yamamoto, “ZCS Interleaved Boost Converter with Saturable Inductors for Reverse-Recovery Reduction”, in Proc. the 11th IEEE International Conference on Power Electronics and Drive Systems (IEEE-PEDS 2015), pp. 855-861 (2015)
Wilmar Martinez, Jun Imaoka, and Masayoshi Yamamoto, “Analysis of Output Capacitor Voltage Ripple of the Three-Phase Transformer-Linked Boost Converter”, in Proc. IEEE 17th Conference on Power Electronics and Applications, EPE’15-ECCE Europe, pp. 1-9 (2015)
Wilmar Martinez, Jun Imaoka, Yuki Itoh, Masayoshi Yamamoto, and Kazuhiro Umetani “A Novel High Step-Down Interleaved Converter with Coupled Inductor”, in Proc. IEEE International Telecommunications Energy Conference – INTELEC, pp. 1-6 (2015)
Hirokatsu Umegami, Masataka Ishihara, Fumiya Hattori, Mitsuru Masuda, and Masayoshi Yamamoto, “Mid-range kHz Electrical Resonance Coupling Wireless Power Transfer”, in Proc. IEEE Energy Conversion Congress & Expo. (ECCE), pp. 3197-3202 (2015)
Kazuhiro Umetani, Eiji Hiraki, and Masayoshi Yamamoto, “Non-isolated Interleaved High Step-up Converter with Reduced Voltage Multiplier Stages and a Regenerative Turn-off Snubber”, in Proc. IEEE Energy Conversion Congress & Expo. (ECCE), pp. 125-132 (2015)
Yuki Itoh, Fumiya Hattori, Shota Kimura, Jun Imaoka, and Masayoshi Yamamoto, “Designing Method Considering Magnetic Saturation Issue of Coupled Inductor in Interleaved CCM Boost PFC Converter”, in Proc. IEEE Energy Conversion Congress & Expo. (ECCE), pp. 2616-2621 (2015)
Masataka Ishihara, Shota Kimura, Wilmar Martinez, and Masayoshi Yamamoto, “Analysis and Design of Passive Components for Interleaved Flyback Converter with Integrated Transformer”, in Proc. IEEE Energy Conversion Congress & Expo. (ECCE), pp. 5902-5909 (2015)
Hiroki Ishibashi, Akihiro Nishigaki, Hirokatsu Umegami, Wilmar Martinez, and Masayoshi Yamamoto, “An Analysis of False Turn-On Mechanism on High-frequency Power Devices”, in Proc. IEEE Energy Conversion Congress & Expo. (ECCE), pp. 2247-2253 (2015)
Shota Kimura, Shogo Aoto, Masataka Ishihara, Jun Imaoka, and Masayoshi Yamamoto, “Interleaved Active Clump Forward Converter with Novel Integrated Magnetic Components”, in Proc. IEEE Energy Conversion Congress & Expo. (ECCE), pp. 6029-6036 (2015)
Shun Endo, Yasuki Kanazawa, Kimihiro Nanamori, and Masayoshi Yamamoto, “Analytical Calculation of the Voltage Ripple on the Input Capacitor of the Voltage-PWM Inverter for High Frequency Operation”, in Proc. IEEE INTELEC, pp. 1175-1178 (2015)
Hirokatsu Umegami, Masataka Ishihara, Fumiya Hattori, Mitsuru Masuda, and Masayoshi Yamamoto, “Basic Experiment Study on Misalignment Characteristic of Electrical Resonance Coupling Wireless Power Transfer”, in Proc. IEEE INTELEC, pp. 419-422 (2015)
Mitsuru Masuda, Masahiro Kusunoki, Hirokatsu Umegami, Fumiya Hattori, and Masayoshi Yamamoto, “Reduce of Electric Ner-Field Intensity by a Shield Box in Wireless Power Tranfser via Field Resinance Coupling”, in Proc. IEEE INTELEC, pp. 429-432 (2015)
Wilmar Martinez, Jun Imaoka, Masayoshi Yamamoto, and Kazuhiro Umetani, “High Step-Up Interleaved Converter for Renewable Energy and Automotive Applications”, in Proc. International Conference on Renewable Energy Research and Applications (ICRERA), pp. 1-6 (2015)
Wilmar Martinez, Masayoshi Yamamoto, Jun Imaoka, Freddy Velandia, and Camilo Cortes, “Efficiency Optimization of a Two-Phase Interleaved Boost DC-DC Converter for Electric Vehicle Applications”, in Proc. IEEE International Conference on Power Electronics -IPEMC 2016- ECCE Asia, pp. 1-7 (2016)
Wilmar Martinez, Masayoshi Yamamoto, Imaoka Jun, Freddy Velandia, and Camilo Cortes, “Efficiency Optimization of a Two-Phase Interleaved Boost DC-DC Converter for Electric Vehicle Applications”, Record of International Power Electronics and Motion Control Conference – ECCE Asia (IPEMC 2016-ECCE Asia) (2016)
Masayoshi Yamamoto, “Benefits and Requirements of Using SiC and/or GaN Power Switching Devices for “Real” Power Control Systems”, in Proc. CS-MANTECH (The International Conference on Compound Semiconductor Manufacturing Technology) 2016, pp. 207-209 (2016) [Invited Paper]
Wilmar Martinez, Mostafa Noah, Masayoshi Yamamoto, and Jun Imaoka, “Reverse-Recovery Current Reduction in a ZCS Boost Converter with Saturable Inductors using Nanocrystalline Core Materials”, in Proc. IEEE 18th Conference on Power Electronics and Applications, EPE’16-ECCE Europe, pp. 1-9 (2016)
Freddy Velandia, Wilmar Martinez, Camilo Cortes, Mostafa Noah, and Masayoshi Yamamoto, “Power Losses Analaysis of Multiphase and Modular Interleaved Boost DC-DC Converters with Coupled Inductor for Electric Vehicles”, in Proc. IEEE 18th Conference on Power Electronics and Applications, EPE’16-ECCE Europe, pp. 1-10 (2016)
Wilmar Martinez, Mostafa Noah, Shun Endo, Kimihiro Nanamori, Shota Kimura, Yuki Itoh, Masayoshi Yamamoto, Jun Imaoka, and Kazuhiro Umetani, “Three-phase LLC Resonant Converter with Integrated Magnetics”, Record of IEEE Energy Conversion Congress & Expo. (ECCE), pp. 1-8 (2016)
Daigoro Ebisumoto, Masataka Ishihara, Shota Kimura, Wilmar Martinez, Noah Mostafa, Masayoshi Yamamoto, and Jun Imaoka, “Design of a Four-Phase Interleaved Boost Circuit with Closed-Closed Inductors”, in Proc. IEEE Energy Conversion Congress & Expo. (ECCE), pp.1-6 (2016)
Masato Sasaki and Masayoshi Yamamoto, “Exciting Voltage Control for Efficiency Maximization for 2-D Omni-Directional Wireless Power Transfer Systems”, Record of 19th International Conference on Electrical Engineering and Technology (ICEET 2017) (Accepted).
Mostafa Noah, Shota Kimura, Shun Endo, Masayoshi Yamamoto, Jun Imaoka, Kazuhiro Umetani, and Wilmar Martinez, “A Novel Three-phase LLC Resonant Converter with Integrated Magnetics for Lower Turn-off Losses and Higher Power Density”, in Proc. 32nd Annual IEEE Applied Power Electronics Conference & Exposition (APEC) (2017) (Accepted)
Masato Sasaki and Masayoshi Yamamoto, “Exciting Voltage Control for Power Transfer Efficiency Maximization for Multiple Transmitting Wireless Power Transfer Systems”, in Proc. IEEE Energy Conversion Congress & Expo. (IEEE-ECCE 2017), (Accepted)
Hoang Chuong Thai, Masataka Isihara, Shota Kimura, Daigoro Ebisumoto and Masayoshi Yamamoto, “A Novel Magnetic Structure of Close-Coupled Inductors to Improve the Thermal Handling Capability in Interleaved DC-DC Converter”, in Proc. IEEE Energy Conversion Congress & Expo. (IEEE-ECCE 2017), (Accepted)
Jun Imaoka, Kenkichiro Okamoto, Shota Kimura, Mostafa Noah, Masayoshi Yamamoto, and Masahito Shoyama,“ A High-Reliable Magnetic Design Method for Three-Phase Coupled Inductor used in Interleaved Multi-Phase Boost Converter”, in Proc. IEEE Energy Conversion Congress & Expo. (IEEE-ECCE 2017), (Accepted)
Mostafa Noah, Kazuhiro Umetani, Shun Endo, Hiroki Ishibashi, Masayoshi Yamamoto and Jun Imaoka, “A Lagrangian Dynamics Model of Integrated Transformer Incorporated in a Multi-phase LLC Resonant Converter”, in Proc. IEEE Energy Conversion Congress & Expo. (IEEE-ECCE 2017), (Accepted)
Ishiwaki Seiya, Ishibashi Hiroki, Iwaki Toshihiro, Sugihara Yuusuke, Nanamori Kimihiro and Masayoshi Yamamoto and Jun Imaoka, “ An Analysis of False Turn-On Phenomenon of GaN HEMT with Parasitic Inductances And Propose Novel Design Method of Gate Resistance Value Focusing on Peak Gate Voltage”, in Proc. IEEE Energy Conversion Congress & Expo. (IEEE-ECCE 2017), (Accepted)
Yusuke Sugihara, Yuma Hayashi, Kyota Aikawa, Kazuhiro Umetani, Kimihiro Nanamori, Masayoshi Yamamoto and Eiji Hiraki, “Analytical Investigation on Design Instruction to Avoid Oscillatory False Triggering of Fast Switching SiC-MOSFETs”, in Proc. IEEE Energy Conversion Congress & Expo. (IEEE-ECCE 2017), (Accepted)
Shota Kimura, Thai Hoang Chuong, Daigoro Ebisumoto, Taichi Kawakami, Jun Imaoka, and Masayoshi Yamamoto “A Novel Isolated DC-DC Converter with Integrated Magnetic Components for EV and HEV Applications”, Record of IEEE International Future Energy Electronics Conference Electronics (IFEEC 2017-ECCE Asia), June 2017.
Jun Imaoka, Kenkichiro Okamoto, Masahito Shoyama, Shota Kimura, Daigoro Ebisumoto, Mostafa Noah and Masayoshi Yamamoto, “Magnetic Design and Experimental Evaluation of Integrated Magnetic Components used in Interleaved Multi-phase DC/DC Converter with Phase Drive Control”, Record of IEEE International Future Energy Electronics Conference Electronics (IFEEC 2017-ECCE Asia), June 2017.
Wilmar Martinez, Camilo Cortes, Jun Imaoka, Kazuhiro Umetani, and Masayoshi Yamamoto, “Current Ripple Modeling of an Interleaved High Step-up Converter with Coupled Inductor”, Record of IEEE International Future Energy Electronics Conference Electronics (IFEEC 2017-ECCE Asia), June 2017.
Maged Bauomy, Haytham Gamal, Adel Shaltout, Mostafa Noah, and Masayoshi Yamamoto, “Power Flow Interactive Sharing between Two DC Nanogrids Photovoltaic Local Branch Dynamic Systems at Island Operation” Record of IEEE 19th Conference on Power Electronics and Applications, EPE 2017 (ECCE-Europe), Sep. 2017.
Mostafa Noah, Shun Endo, Shota Kimura, Masayoshi Yamamoto, Jun Imaoka, and Kazuhiro Umetani “An Investigation into a Slight-Variation of the Transformer Effective Permeability in LLC Resonant Converter” Record of IEEE 19th Conference on Power Electronics and Applications, EPE 2017, Sep. 2017.
Toshihiro Iwaki, Seiya Ishiwaki, Yusuke Sugihara, Takashi Sawada, Kimihiro Nanamori, Mostafa Noah, Shota Kimura, and Masayoshi Yamamoto, “The theoretical analysis of False-Turn-ON of GaN HEMT”, in Proc. International Conference on Materials and Systems for Sustainability 2017 (ICMass)
Tengfei Ou, Thai Hoang Chuong, Daigoro Ebisumoto, Shota Kimura, Yusuke Sugihara, Seiya Ishiwaki, and Masayoshi Yamamoto, “A combination of ferrite and powder cores to increase the efficiency in interleaved DC-DC converters”, in Proc. International Conference on Materials and Systems for Sustainability 2017 (ICMass).
Shota Kimura, Kimihiro Nanamori, Mostafa Noah, and Masayoshi Yamamoto “A Novel LLC Resonant DC-DC Converter with Integrated Transformer”, in Proc. IEEE International Telecommunications Energy Conference – INTELEC, pp. 1-5 (2017).
Daigoro Ebisumoto, Shota Kimura, Kimihiro Nanamori, Mostafa Noah, Jun Imaoka, Masataka Ishihara, and Masayoshi Yamamoto “Analytical Investigation of Interleaved DC-DC Converter using Closed Coupled Inductor with Phase Drive Control”, in Proc. IEEE International Telecommunications Energy Conference – INTELEC, pp. 1-4 (2017)
Shota Kimura, Kimihiro Nanamori, and Masayoshi Yamamoto“Modeling and Design of Interleaved Multi-phase DC-DC Converter with 2-phase Coupled Inductor Cell for High Power Density”, in Proc. International Conference on Renewable Energy Research and Applications (ICRERA), pp. 1-6 (2017)
Yuki Ishikura, Jun Imaoka, Mostafa Noah, and Masayoshi Yamamoto, “Core Loss Evaluation in Powder Cores: A Comparative Comparison between Electrical and Calorimetric Methods”, IPEC Niigata, May 2018
Jun Imaoka, Kenkichiro Okamoto, Masahito Shoyama, Yuki Ishikura, Mostafa Noah, and Masayoshi Yamamoto, “Modeling, Magnetic Design, and Simulation Methods Considering DC Superimposition Characteristic of Powder Cores Used in Power Converters”, IPEC Niigata, May 2018
Yoshiya Ohnuma, Satoshi Miyawaki, Fumiya Hattori, and Masayoshi Yamamoto, “Experimental Evaluation of Inverter System Consisting of 4-Parallel GaN Devices Unit”, IPEC Niigata, May 2018.
Yusuke Sugihara, Kimihiro Nanamori, Masayoshi Yamamoto, and Yasuki Kanazawa “Parasitic Inductance Design Considerations to Suppress Gate Voltage Oscillation of Fast Switching Power Semiconductor Devices”, IPEC Niigata, May 2018.
Masato Sasaki and Masayoshi Yamamoto, “Multiple Exciting Voltage Control for Maximization of Multi-Hop Wireless Power Transfer Efficiency”, IPEC Niigata, May 2018.
Mostafa Noah, Jun Imaoka, Yuki Ishikura, Kazuhiro Umetani, and Masayoshi Yamamoto, “Review of Current Balance Mechanism in Three-phase LLC Resonant Converter”, in Proc. IEEE International Symposium on Industrial Electronics (ISIE 2018), Cairns, Australia, June 2018.
Tengfei Ou, Mostafa Noah, Koichi Morita, Mamoru Tsuruya, Seiji Namiki, Jun Imaoka, Masayoshi Yamamoto, “A Novel Design Method of an Isolated Transformer Used in a 1.3-MHz LLC Resonant Converter with GaNFETs”, IEEE PEAC, November 2018.
Masayoshi Yamamoto, Takahiro Kawashima, and Shigeyuki Funabiki, “Feasible Evaluations for High Performance Multi-Phase Trans-Linked Boost Chopper Circuit”, SPC-08-125, Korea Advanced Institute of Science and Technology, Korea (2008)
HirokatsuUmegami, Fumiya Hattori, andMasayoshi Yamamoto, “Loss Analysis of Gate Drive Circuit for GaN-FET”,Korea-Japan Joint Technical Workshop on Semiconductor Power Converter (2012)
Fumiya Hattori, HirokatsuUmegami, Takashi Yoshida, andMasayoshi Yamamoto, “Proposal of Capacitor-less Gate Drive Circuit Suitable for GaNFET”, Record of Korea-Japan Joint Technical Workshop on Semiconductor Power Converter (2012)
HirokatsuUmegami, Fumiya Hattori, andMasayoshi Yamamoto, “Gate Drive Circuits suitable for Normally Off Type GaNFET”, Taiwan-Japan Symposium on Power Conversion (2012)
Fumiya Hattori, HirokatsuUmegami, Takashi Yoshida, andMasayoshi Yamamoto, “Reverse Conduction Loss Comparison of Gate Drive Circuits for GaNFET”, Record of Taiwan-Japan Symposium on Power Conversion (2012)
Shogo Aoto, AkinoriTsuboi, Jun Imaoka, and Masayoshi Yamamoto,“Investigationon Miniaturization and Reduction of Output Voltage Ripple Using Multilayer Ceramic Capacitor”, Japan-Korea Joint Technical Workshop on Semiconductor Power Converter, pp. 203-206 (2013)
Wilmar Martinez, Jun Imaoka, Masayoshi Yamamoto, and Kazuhiro Umetani, “Parasitic Resistance Analysis in a Novel High Step-Up Interleaved Converter for Hybrid Electric Vehicles”, JIPE-Power Electronics Society, JIPE-40-08(2014)
Yasuki Kanazawa and Masayoshi Yamamoto, “Li-ion Capacitor & Li-ion Battery Hybrid Power Conversion System for Electric Vehicles”, Record of Symposium on Semiconductor Power Conversion (S2PC), 2014.
Fumiya Hattori, Hirokatsu Umegami, Masayoshi Yamamoto, Masahiro Kusunoki, and Mitsuru Masuda, “Noise Evaluation of Wireless Power Transfer using Electric Resonance Coupling”, Record of Symposium on Semiconductor Power Conversion (S2PC), 2014
Fumiya Hattori, Hirokatsu Umegami, and Masayoshi Yamamoto, “A New Gate Drive Method for High-Frequency Applications”, Record of Symposium on Semiconductor Power Conversion (S2PC), pp.133-134 (2015)
Kimihiro Nanamori, Shun Endo, Yasuki Kanazawa, and Masayoshi Yamamoto, “Effectiveness of a Combination of SiC MOSFETs and Auxiliary Resonant Commutated Pole Inverter”, Record of Symposium on Semiconductor Power Conversion (S2PC), pp. 164-165 2015
Shota Kimura and Masayoshi Yamamoto, “Volume Comparison of Integrated Magnetic Components Applied to Interleaved DC/DC Converters”, Record of Symposium on Semiconductor Power Conversion (S2PC), pp.149-150 (2016)
Jun Imaoka, Kenkichiro Okamoto, Daigoro Ebisumoto, Shota Kimura, Masayoshi Yamamoto, and Masahito Shoyama, “A Novel Design Method of Integrated Magnetic Components Used in Two-phase Interleaved Converter with Phase Drive Control”, Record of Symposium on Semiconductor Power Conversion (S2PC), pp.52-53 (2016)
Masayoshi Yamamoto, “Benefits and Requirements of Using SiC and/or GaN Power Switching Devices for “Real” Power Control Systems”, in Proc. CS-MANTECH 2016 (The International Conference on Compound Semiconductor Manufacturing Technology), pp. 207-209, 18. May. 2016.
Masayoshi Yamamto, An Analysis of False Turn-On Mechanism on SiC/GaN Power Devices, The 36th Annual NANO Testing Symposium (NANOTS 2016),依頼講演,11月9日, 2016.
Masayoshi Yamamoto:”Frontiers about turn-on failure analysis of inverter system for automotive using TCAD,”Workshop, Simulation Technology of Silicon Carbide Devices:Design Optimization from Atom level to Circuit level,(熱海市・静岡県),6月22日,2017.
BI-DIRECTIONAL DC-DC CONVERTER, US Patent Application No. 12/250,843, 12/17/2008, M. Yamamoto, H. Hara, S. Funabiki, H. Asuke, H. Takano, M. Tsuruyaand M. Kanazawa
DC-DC CONVERTER, US Patent Application No. 12/179036, 7/24/2008, M. Yamamoto, T. Kawashima, S. Funabiki, H. Asuke, H. Takano, M. Tsuruyaand M. Ochiai
Resonant Power Conversion Apparatus, European Patent Application No. 10173638.7-2207, M. Yamamoto, H. Terui, H. Asuke, and H. Takano
DC-DC CONVERTER, PCT/JP2009/060833, 6/15/2009, M. Yamamoto, T. Kawashima, S. Funabiki, H. Asuke, H. Takano and M. Tsuruya
DC-DC CONVERTER, PCT/JP2009/060832, 6/15/2009, M. Yamamoto, T. Kawashima, S. Funabiki, H. Asuke, H. Takano and M. Tsuruya
CURRENT-MODE CONTROLLED DC-DC CONVERTER, US Patent Application No. 12/250,839, 01/16/2009, M. Yamamoto, H. Horii, S. Funabiki, H. Asuke, H. Takano, M. Tsuruyaand M. Kanazawa
DC-DC CONVERTER, WO2011/061984, 5/26/2011, M. Yamamoto, M. Nakahama and Y. Satake