Research keywords:
- power converters
- semiconductor power devices
- thermal management
- packaging and integration
Prof. Castellazzi holds an MSc degree in Physics (Specialty of Electronics) from the State University of Milan, Italy, and a PhD degree in Electrical Engineering from the Munich University of Technology, Germany. He has worked in power electronics since 1997 and has had positions both in industry (OHB Italia, Siemens Corporate Technology, ALSTOM-PEARL) and academia (TU Munich, ETH Zurich, University of Nottingham). He started to work on WBG technologies in 2011, as a Guest Scholar in Prof. Hikihara`s Lab, Kyoto University, and since then developped a strong connection to Japan. In July 2019 he moved to Kyoto and established the SP2-Lab in the KUAS brand new Faculty of Engineering. Prof. Castellazzi is a member of the IEA Power Electronics Technology Annex. He takes active part in the international power electronics community and regularly serves as Guest Editor of a number of Journals and as Organizing and Technical Programme Committee member of a number of specialist international conferences.
Research highlights: high efficiency high-power density novel WBG topologies; double-sided cooled high-switching speed packaging concepts; WBG device robustness limits assessement and improvement.
Research keywords:
- Y-inverter
- DC-DC converters
- modulation schemes
- control
Dr. Jaber holds a Ph.D. degree in electrical and electronic engineering from the Tokyo Institute of Technology, Tokyo, 2021. He focuses on research in advanced wide-band-gap power converters for future e-mobility. His research interests include motor drives, high-power modular converters, and control of power electronics.
Research highlights: high-efficiency high-frequency WBG and hybrid Y-Inverter topologies, including dual switching frequency and interleaved configurations; formulation of hybrid modulation schemes to optimise performance over a broad range of load conditions.
Research keywords:
- multi-level inverters
- motor design
- motor drives
- high-frequency gate-drivers
Mr. Kwak holds a BSc degree (2012) in Mechanical Engineering and an MSc degree (2014) in automotive engineering from Hanyang University, Seoul, Korea. From 2014 to 2020 he was employed by LG Electronics, Korea, to design, develop and test eletrical machines for electric vehicle applications. Since Apr. 2020 he has been with the SP2-Lab pursuing a PhD degree on "Inverter-machine parametric co-design for energy efficient electric drive system".
Research highlights: optimisation of motor-drive system energy efficiency over the driving cycle; demonstration of dual modulation scheme for optimum performance and reduced electro-thermal stress; machine-inverter parametric co-design demonstration and theoretical integrated design framework development.
Research keywords:
- WBG power conversion
- current source inverters
- motor drives
- sensorless control
- integration
Mr. Lee holds a BSc degree in Control and Instrumentation Engineering and an MSc degree in Mechatronics from Korea University. He has been a Senior Researcher at LG Electronics, Seoul, Rep. of Korea, since 2012 and is currently pursuing a PhD degree on "Functional and structural integration for re-configurable fault-tolerant electric drives". He has been invovled in strategic industrial R&D projects on (25kW 3 Phase Inverter-fed PMSM; 17kW DC/DC Converter; 10kVA 3Phase Grid-connected inverter for the shunt active power filter) and published 13 papers in international journals and conferences.
Research highlights: novel current-sensor-less control of high-frequency current-source inverter; design, development and demonstration of custom integrated SiC MOS bi-directional switches; innovative modulation and control schemes for current-source and Y-inverters.
Research keywords:
- dc-dc converters
- thermal management
- control
Mr. Nagpala holds a BSc degree in Electrical Engineering from the University of the Philippines Los Baños, where he is also appointed as an Instructor for Power Electronics. He is presently on a 2 years` leave to pursue an MSc degree at KUAS-E.
Research highlights: high-frequency high-efficiency all-SiC improved quadratic boost converter for high step-up ratios; advanced PCB-design with integrated cooling capability.
Research keywords:
- wireless power transfer
- dc-dc converters
- WBG semiconductors
Mr. Sakuraba is a 4th year undergraduate student majoring in Electrical Engineering. He is very passionate about wire-less power transfer and is developing innovative power conversion solutions for use in drone and robot battery charging in the context of factory automation. The results of his student project activities have contributed to papers published in specialist international conferences and have often been used in Open Campus demonstrations, in which he regularly acts as a student ambassador.
Research highlights: 3MHz FPGA-based PWM modulation of a GaN power converter for 150 kHz WPT applications; demonstration of best-in-class efficiencies for low-power applications (e.g., drone).
Research keywords:
- magnetic devices
- dc-dc converters
- battery systems
Mr. Onishi is a 4th year undergraduate student majoring in Electrical Engineering. He is passionate about wire-less power transfer applications and robotics and is designing bespoke magnetic components for high power density high-efficiency 150 kHz applications. The results of his student project activities have contributed to papers published in specialist international conferences.
Research highlights: efficient and lightweight transformers for WPT applications by commercial high-frequency materials and custom developed 3D-printed bobbins.
Dr. Matacena joined the Lab as a Visiting Researcher from Dec. 2020 to Mar. 2021. She worked on SiC power MOSFET gate-oxide defects and interface traps, perfoming oriignal measurements and device simulations under drain-biased conditions. The results of her work were published in two jointly authored papers (I. Matacena et al., IPFA2022; I. Matacena et al., Materials Science Forum Vol. 1062, 2022), one of which won her a best-poster award.
Dr. Borghese joined our Lab from Dec. 2020 to Jun. 2021. His worked focus on characterization and application of WBG semiconductor devices and encompassed: SiC MOSFETs gate-driver design and failure isolation in parallel multi-chip structures; GaN HEMTs double-pulse and short-circuit testing; GaO2 diodes characterization in high-frequency PFC circuits. The results of his work were published in one jointly authored paper (A.. Borghese et al., WiPDA-Asia2023).
Dr. Bayarkhuu was with us in Nov. and Dec. 2021. He helped us develop hybrid integrated GaN-SiC switches, which jointly optimise switching, conduction and free-whe eling performance in power conversion applications. The results of his work were published in a jointly authored paper (B. Bayarkhuu et al., ISPSD2022).
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