Loss-minimization of high-frequency power transformers for a 11 kW / 800V (H)EV off-board charger

Conference: PCIM Europe digital days 2020 - International Exhibition and Conference for Power Electronics, Intelligent Motion, Renewable Energy and Energy Management
07/07/2020 - 07/08/2020 at Deutschland

Proceedings: PCIM Europe digital days 2020

Pages: 8Language: englishTyp: PDF

Schmidhuber, Michael; Drexler, Christoph (SUMIDA Components and Modules GmbH, Germany)
Mueller, Wolfgang; Leipold, Michael (Deutronic Elektronik GmbH, Germany)

In this paper, techniques to determine and minimize losses of high-frequency power transformers are presented. This is done in the framework of the development of an air-cooled 11 kW / 800 V off-board charger with a target power density of 2.2 kW / litre (36 W/in3). Therefore, a soft-switched silicon-carbide (SiC)-based power electronic is utilized operating at a high switching frequency of 0.5 MHz. Thus, the volume of the required transformer for galvanic isolation is considerably reduced. For further significant size-reduction of the power transformer the advantages of DC-biased magnetic materials are investigated.