Selection an Effective Implementation of a Multiphase Isolated DC-DC Converter

A study was made of the power loss in the active elements (transistors, diodes) of several circuit designs of a multiphase isolated DC-DC converter with the number of phases from two to five in the range of multiple changes in the supply voltage. The switching processes in a multiphase circuit with a different number of phases on the intervals of the operating values of the current pulse duty ratio are considered. The conditions for comparing the power of losses in the active elements of circuit designs are determined. Comparison of the power of losses in the designs is proposed by the equivalent element method, which ensures the equivalence of the schemes. Analytical expressions of the current shape coefficient are given, as well as analytical and graphical dependences of the relative power loss in transistors and diodes for a fixed and variable supply voltage. A comparative analysis of the power loss in the elements identified the most effective schemes of three and four phase versions of the converter.