Selection Types Of Topologies Of Isolated Boost DC-DC Converters

The study of power losses in active elements (transistors, diodes) of six types of topologies of isolated Boost DC-DC converters with two-phase and three-phase versions in the range of two-fold change in the supply voltage has been carried out. The switching processes in topologies on the intervals of working values of the pulse duty cycle are considered and the conditions for comparing the power losses in the active elements of the topologies are determined. Comparison of the power losses in the elements was carried out by the method of the equivalent element, which ensures the equivalence of the topologies. Analytical expressions are given for the current shape factor, as well as analytical and graphical dependences of the relative power losses in transistors and diodes at a fixed and varying supply voltage. Comparative analysis of power losses in the elements showed that the most effective are three-phase topologies of converters.