DAB converter topology and
operating schemes are introduced. And core-type transformers
design optimization methods are proposed for both single and
three-phase DAB converters (DAB1 and DAB3). Based on
DAB topology assumptions, single and three-phase
transformers are compared in volume with various design
constraints. And analysis shows that comparison result varies
at different cases of flux and thermal limits. Scaled-down
DAB1 and DAB3 systems have been built and temperature
rises of the transformers have been tested for verification.