Computer-aided design for high-frequency power transformers

A computer-aided tool for design and analysis of high-frequency power transformers has been developed. The program uses a multidimensional minimum-search algorithm to design the smallest transformer and determine the optimum number of turns, winding space allocation, and size of the magnetic core. The design specifications include current and voltage waveforms, desired core shape and material, type of winding (Litz wire, solid wire, or foil), and primary and secondary winding arrangement. The program also calculates the core loss and computes the winding loss distribution, taking into account proximity and skin effects. An experimental transformer was designed for a 75 W offline zero-current quasi-resonant converter to verify the calculations.<>