Analysis of Zero Voltage Transition SEPIC converter

In this paper, modeling and analysis of Zero Voltage Transition (ZVT) SEPIC converter is presented. This ZVT scheme yields reduced current stress on the auxiliary elements, which leads to lower conduction losses and improved efficiency. In addition, a reduction in size of auxiliary magnetic elements can be accomplished. This soft-switching converter is capable of operating over wider line and load variations at considerably high frequencies. The operation principles, a detailed analysis and a soft-switching resonant circuit design procedure of the proposed converter are presented. A 100 Watt, 50 kHz prototype circuit is built and tested. The proposed design methodology is verified both in simulation and experiments for different loading conditions. Measurement observations are in close agreement with the simulation and analytical predictions.