AAU logo

Events at Department of Energy Technology

Guest lectures by Professor Mark Johnson and Associate Professor Zhe Zhang


27.06.2019 kl. 10.00 - 12.00


There will be two guest lectures on June 27 prior to the PhD defence of Asger Bjørn Jørgensen


Packaging and Integration Solutions for Wide Band-Gap Power Electronics


Professor Mark Johnson, University of Nottingham, UK 


10:00 -11:00


New approaches to packaging and integration will be needed to unlock the full potential of wide bandgap devices. Compared to silicon power device technology, their greatly increased switching speeds allow much higher switching frequencies to be achieved, leading, for example, to smaller passive component requirements, more power dense converters and a reduced bill of materials (BoM). However, such desirable features can only be achieved if circuit parasitics and associated electromagnetic interference can be reduced to unprecedentedly low levels, driving a move away from assemblies of discrete components, each of which is designed and packaged separately, to fully integrated assemblies comprising power devices, gate drives, filters, sensing, and control functions. Here we examine the design and realisation of integration solutions for SiC and GaN devices at the kW level, incorporating individual commutation cells with close-coupled gate drives, input/output filtering and electromagnetic screening/shielding.

About the lecturer

Professor C Mark Johnson received the BA degree in engineering and the PhD degree in electrical engineering from the University of Cambridge, UK, in 1986 and 1991 respectively.

From 1990 to 1992 he was a Research Associate at the University of Cambridge and in 1992 he was appointed Lecturer at the University of Newcastle, UK, where his research included the design, analysis and characterisation of power semiconductor devices, resonant power conversion and instrumentation.

From 1998 to 2001 he managed the UK national programme on Silicon Carbide electronics and in 2000 he became Reader of Power Electronics at the University of Newcastle. In 2003, Professor Johnson was appointed as Rolls-Royce/RAEng Research Professor of Power Electronic Systems at the University of Sheffield and in 2006 he was appointed to a personal chair at the University of Nottingham, where he leads research into power semiconductor devices, power device packaging, reliability, thermal management, power module technologies and power electronic applications.

He is Director of the UK Engineering and Physical Sciences Research Council (EPSRC) Centre for Power Electronics, which combines the UK’s best academic talent to address the key research challenges underpinning power electronics.



Partial Power Conversion of Interfacing Electrochemical Energy Storage Devices


Associate Professor Zhe Zhang, DTU, Denmark 


11:00 -12:00


Various sources for renewable energy production are currently in use, and more are being researched in order to bring them to the commercial level. High efficiency and low cost power converters for interfacing energy storage have become more and more critical in renewable energy systems. In this speech, a partial power conversion concept is introduced to reduce power rating as well as cost of the dc-dc converter for electrochemical energy storage devices such as alkaline electrolyzer cells, bidirectional fuel cells and batteries. Here, several different partial power processing schemes will be described and discussed in this lecture, and a couple of applications will be shown. Therefore, design challenges and their associated solutions, as well as future research trend of partial power conversion, are presented accordingly.

About the lecturer

Zhe Zhang received PhD degree from the Technical University of Denmark (DTU) in 2010. Currently, he is an Associate Professor and Director of MSc Programme in Electrical Engineering at DTU. Senior Member of IEEE. He has authored or co-authored more than 150 transactions and international conference papers and filed over ten patent applications. He has supervised over ten PhD students since 2013. Dr. Zhang’s current research interests include applications of wide bandgap devices, high frequency dc-dc converters, multiple-input dc-dc converters, wireless power transfer, soft-switching power converters and multi-level dc-ac inverters for renewable energy systems (RES), hybrid electric vehicles (HEV) and uninterruptable power supplies (UPS); piezoelectric-actuator and piezoelectric-transformer based power conversion systems. Dr. Zhang has received several awards and honors including Best Paper Award in IEEE ECCE, Best Paper Award in IEEE IGBSG, Best Teacher of the Semester, Chinese Government Award for Outstanding Students Abroad, etc. He is also a guest associate editor in IEEE Transactions on Industrial Electronics and guest editor in IEEE Journal of Emerging and Selected Topics in Power Electronics.

THE guest lectures WILL TAKE PLACE in Pon 111 in the auditorium and all are welcome.



Department of Energy Technology


Pontoppidanstræde 111, auditorium 1.177