Power electronics is a technology for efficient control and conversion of electrical energy. Power electronics is used extensively in all parts of modern living from harvesting, storing and distributing renewable energy to powering satellites, aircrafts, electrical vehicles, robots, pumps, data-centers and to support our everyday personal needs such as washing machines, cooking, phones, entertainment etc. Power electronics is therefore an absolute key technology in achieving a green sustainable future.
High efficiency compact DC-DC converters
Our research in dc-dc converters focuses on achieving the highest conversion efficiency and making them more compact in size. Reducing losses will increase the available output power leading to more sellable power in solar applications or longer range in electrical vehicles. For higher power levels, lower losses also reduce size and cost of the converter itself. Achieving the highest conversion efficiency requires a total optimization of the complete converter design including all steps from selection of converter topology, optimization of magnetic design, selection of power devices, and design of EMI-filters to the detailed circuit board layout. Measured efficiency is therefore a good metric of the level of design optimization achieved in a given application and thus also becomes a very useful research objective in power electronics.
Advanced high frequency magnetic components
Advanced high frequency magnetic components are a key element in achieving high conversion efficiency in power converters. Our research is therefore focused on reducing losses and sizes of magnetic components. To achieve this objective we conduct research into improving methods for analyzing, simulating, designing, manufacturing and testing of magnetic components.
Finite Element Modelling of magnetic components
Our research in dc-dc converter requires simulation and analysis of magnetic components in the design stage due to both technical and economical reason. This becomes more critical when we are designing planar magnetics. Our research is focused on the Finite Element Modelling of planar magnetics to simulate various parasitic of the magnetics using software’s such as COMSOL and ANSYS.
Three-phase Power Factor Correction rectifiers
A Power Factor Correction (PFC) rectifier is a front end switch mode converter which regulates the input current of an electronic load (dc-dc converter) to achieve unity power factor, thereby improving grid power quality. However, PFC rectifiers add significant cost and losses. Our research is therefore focused on reducing losses in PFC rectifiers. Bi-directional PFCs will become a key component in realizing future SMART grid systems.
Electromagnetic Interference in power converters
While achieving very high conversion efficiency and small size, the high switching frequency in modern power converters are also responsible for the majority of the electromagnetic noise generation and emission in electronic systems. The filters required to attenuate this noise to comply with required emission standards can be both large and expensive. We therefore conduct research into improving analysis and prediction of converter noise levels and to design optimum Electromagnetic Interference (EMI) filters.
Morten Nymand (Professor MSO, Group leader)
Rakesh Ramachandran (Assoc. Professor)
Christian Østergaard (PhD)
Mohammad Najjar (PhD)
Lasse Stræde Bjerregaard Nielsen (Res. Assistant)
Jesper Nielsen (Eng. Assistant)
Find selected projects here:
- APETT - Advanced Power Electronic Technology and Tool, Read more
- PE:Region, Read more
- PE:Region Platform, Read more
- Industriel Elektronik Innovation (IEI) eWorkVehicle
- Industriel Elektronik Innovation (IEI) eWorkVehiclePower
- Industriel Elektronik Innovation (IEI) FlexiCharge
- EUDP project: eRCV Power 2019
Find latest publications here:
A 20 kW High Power Density Isolated DC-DC Converter for an On-board Battery Charger utilizing Very-low Inductive SiC Power Modules. Ramachandran, R., Nielsen, J., Nymand, M., Nageler, N. & Eisele, R., 2020, APEC 2020 - 35th Annual IEEE Applied Power Electronics Conference and Exposition. IEEE, s. 3503-3507 9124200. (Conference Proceedings - IEEE Applied Power Electronics Conference and Exposition - APEC, Bind 2020-March), Read more
Analysis and Experimental Verification of Reducing Intra-winding Capacitance in a Copper Foil Transformer. Ramachandran, R., Nymand, M. & Nielsen, J., 2020, APEC 2020 - 35th Annual IEEE Applied Power Electronics Conference and Exposition. IEEE, s. 2653-2657 (IEEE Applied Power Electronics Conference and Exposition (APEC)), Read more
Mitigation Zero-crossing Distortion of Active Neutral-Point-Clamped Rectifier with Improved Hybrid PWM Technique. Najjar, M., Nymand, M. & Kouchaki, A., jun. 2020, 2020 IEEE 29th International Symposium on Industrial Electronics, ISIE 2020 - Proceedings. IEEE, s. 744-749 6 s. 9152373. (IEEE International Symposium on Industrial Electronics, Bind 2020-June), Read more