Electromagnetic limits of planar integrated resonant/transformer structures for power electronic applications

The integrated planar resonant/transformer structure analysed is constructed from planar ferrites, conductive layers, leakage layers and slabs of ceramic dielectric. The electromagnetic limits are analysed in terms of the permeabilities, permittivities and conductivities, skin effect, breakdown field and physical dimensions. An example of a converter with an integrated resonant/transformer (LLCT) structure is used to illustrate the analysis. This analysis indicates that the electromagnetic limits results in volumes two orders of magnitude smaller than at present, illustrating that the power density is currently only limited by construction technology. The thermal limit is expected to be the next barrier within one order of magnitude.