Integrated magnetics for high power density, high efficiency power converters


This industrial postdoc project was financially supported by Højteknologifonden, and technically collaborated between DTU and Flux A/S. This project was carried out in a two year period from Nov. 2011 till Nov. 2013.

With the development of modern power electronics requiring higher power density and higher efficiency dc-dc converters Flux A/S and DTU had a clear vision of the vital role of integrated magnetics (IM) technique. The shared vision of the partners is that new integrated magnetics (IM) designs will enable unprecedented performance of dc-dc power converters, thereby creating a unique and highly competitive solution for certain markets, such as the automotive, aerospace, and renewable energy sectors.

Achieved results:

This project targets on the multiple inputs dc-dc converters for renewable energy use, employing a new geometrical magnetic core with IM technique. A common limitation of some known multiple inputs converters is that only one input power source is allowed to transfer the power energy to the output at a time to prevent power coupling effect, so that the system cannot optimize the utilization of diversified power energy sources.

The project contributes a novel 3D orthogonal flux cancellation methodology in the magnetic core and therefore allows the power delivering simultaneously or at any time-scheme. Moreover, the proposed structure enables unprecedented performance such as wide input/output range, high power density, and flexible control strategies etc., thereby creating a unique and highly competitive solution for certain markets.

1-kW prototypes of two inputs full-bridge isolated boost converter using the FQIT (four quadrants integrated transformer) and its equivalent structure (eFQIT) associating with renewable energy sources such as solar panel, fuel cell, and batteries, have been successfully demonstrated in the lab.

Several technical papers have published in high ranking Journals and International Conferences. And two US&EU&PCT patents have also been filed.


The project result is expected to be applied the extensive power electronics applications, and practically create the society and commercial values.

Completed: 2013.


Ziwei Ouyang
Associate Professor
DTU Electro
+45 45 25 57 64