| Abstract |
A high-frequency power transformer in multilayer printed circuit board (ML-PCB) technology is presented. The transformer with applications in switched mode power supplies operates at frequencies up to several MHz and therefore parasitics play a major role. The mechanical configuration of laboratory prototypes is discussed, as well as the electrical, parasitic and thermal behavior. The presentation is focussed on the leakage inductance, since the anilysis of other aspects is relatively simple. Test results show a high efficiency, low leakage inductance, a good thermal behavior and line insulation properties. Further, the topology enables the designer to make a trade-off between leakage inductance and interwinding capacitance. These parasitic components have to be minimized. Due to the strictly defined geometry, parasitic interwinding capacitance and leakage inductance are reproducable and can be computed relatively easily. |
