MODELING OF LOSSES IN A SANDWICHED-WINDING MATRIX TRANSFORMER

This paper assesses the suitability of the sandwiched-winding matrix t ransformer for low-profile applications from the loss standpoint. Fini te-element simulations and experiments suggest that the core loss can be adequately characterized by approximating the matrix transformer as a collection of identical uncoupled elements. Thus, a matrix transfor mer with a large number of elements may have higher core loss than a c onventional (tall) transformer, and more core loss than winding loss. Eddy-current analysis reveals that the interconnects which parallel th e elements incur a significant fraction of the-winding loss. Thus, loa d distribution is recommended to eliminate the paralleling interconnec ts in matrix transformers.