Electrical, thermal and electro-magnetic analyses of a 100 kHz interleaved power electronic transformer

Abstract

In this paper, the finite element electrical, thermal and electro-magnetic analysis of an interleaved power electronic transformer structure operable at 100 kHz is presented. The analysed power electronic transformer structure is modelled with an EE-shaped core and interleaved primary and secondary windings. Electromagnetic analysis was done on the structure to study its properties like magnetic flux density, magnetic field, current density and relative permeability. Electrical and thermal analysis was done on the transformer to study its operating efficiencies and losses in isolation, buck and boost working modes. The analyses were done for different frequencies to ascertain that 100 kHz is the better choice of frequency for the designed power electronic transformer. The results are compared to a non-interleaved power electronic transformer structure to study the improvement obtained in the interleaved model. It was seen that transformer efficiencies of about 99 % could be obtained on using interleaved winding technique rather than non-interleaved method. Finite element modelling software-Altair FLUX was used to simulate the transformer and analytic equations were used to verify the obtained results.