Optimum Design of a High-Power, High-Frequency Transformer - Power Electronics, IEEE Transactions on

A procedure for optimum design of a high-power, high-frequency transformer is PresentedThe Procedure is based on both electrical and thermal processes in the transformer and identifies a) the VA-rating of ferrite cores in relation to the operating frequency, , , ) the optimum flux density in the core, and c) the optimum current densities of the windings providing maximum transformer efficiency. Since the transformer is the major contributor to the volume and weight of the Power Supply, the results of transformer analysis can be used for entire power supply optimization as well. Two high-power, high-frequency transformers are optimally designed, built, and tested. Practical There are several curve fitting fit formulae used for the approximation of core loss [4], [6], [ 101, [ 121, [ 151, [ 171-[ 191, and [251 either from the physical or geometrical interpretation of data sheet curves. The main criterion for the fit formula choice should be the approximation accuracy. In terms of that, the geometrical interpretation is more preferable, since the physical model, usually based on several simplifications, is not enough. The best combination between the accuracy and to have the expression used results show good agreement with the theory. in [61, [121, [151, U71, [251