Experimental implementation of a high efficiency bidirectional multi-phase multi-input dc-dc converter

Studies on electric vehicles (EVs) have been recently accelerated by several reasons, such as, increasing environmental concerns and unstable oil prices. Unfortunately, the number of commercial EVs are limited since batteries used in EVs exhibit some problems, e.g, unsatisfactory power density, short life-time, long charge time. So as to overcome these problems, using hybrid power systems (HPSs) in EVs are proposed in the literature. For example, battery/ultra-capacitor HPS provides high power/energy density and longer battery life. In this thesis, a bidirectional multi-phase multi-input DC-DC converter is designed for 10kW power capacity and then it's analyzed via PSIM software. The design procedure includes the selection of semiconductor materials and the sizing filter elements. Through developed simulation models, 1-phase, 2-phaseand 3-phase structures are compared in terms of efficiency, current ripple and switching stress. After that this analysis is validated by experiment.