REALIZATION OF A MULTILEVEL, BIDIRECTIONAL BUCK-DERIVED CONVERTER

Abstract

This thesis centers on the realization of a multilevel, bidirectional buck-derived DC-DC converter whose typology is capable of extremely large transformation ratios. The emphasis of this work is on the mode of operation in which the power flow is from a high voltage source to a low voltage load. The converter concept is explained in detail and a modulation scheme with considerations for practical implementation is discussed. The design of a prototype four-level converter is detailed and major loss mechanisms of the converter are described. Both directions of power flow are shown through simulation. Prototype hardware results are presented to demonstrate proof of the concept and provide validation for theoretical and simulation results.