Symmetrical and asymmetrical controlled three-phase high frequency isolated DC–DC converter

Abstract

The increasing diversity of applications such as industrial, telecommunications, transports, aerospace, military, and the continuous demand for smaller, lighter, and more efficient high power supplies have forced to draw attention towards high frequency isolated, three-phase DC–DC converter. The proposed DC–DC converter can be used in applications which require very low voltage conversion ratio, isolation, good regulation against load and line disturbances, and fast dynamic response. In this paper modeling, control and design of high-frequency isolated three-phase DC–DC converter is carried out under symmetrical and asymmetrical control with fixed frequency operation and its steady state analysis is presented according to the description of the operation stages of the converter. A 750W, 5V/150A prototype model of proposed DC–DC converter is built and tested at different operating conditions. Based on experimental results under both control methods, performances of proposed converter have been investigated in view of low voltage high current applications.