Ultra High efficiency DC-DC converters

 

Our research in DC-DC converters focuses on achieving the highest possible conversion efficiency.

Reducing losses will increase the avaiable 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, design of EMI-filters to the detailed circuit board lay-out. 

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. 

High efficiency DC-DC converter using wide band-gap power semiconductors

By Rakesh Ramachandran

Wide band gap materials such as Silicon Carbide (SiC), Gallium Nitride (GaN) become the emerging materials for power devices due to their material properties. These material properties can be utilized in power converters to improve their efficiency and hence makes them more compact. This research project mainly focus on achieving highest possible conversion efficiency in isolated dc-dc converters. Achieving ultra-high efficiency leads to the reduction of heat sink and thus makes the converter more compact in size, which potentially makes them cheap. The other objectives of this project include:

  • analytical and optimal application of GaN devices in dc-dc converter
  • designing of high efficiency magnetics (transformer and inductor)
  • power loss modelling of dc-dc converter
  • development of a compact high power bi-directional GaN converter

The ultimate aim of this project is to study, design, develop and demonstrate the maximum achievable efficiency in isolated bi-directional dc-dc GaN converter.

This research project is funded by the Danish National Advanced Technology Foundation under Intelligent Efficient Power Electronics (IEPE).