Testovací buňka víceúrovňového DC-DC měniče pracujícího s vysokým převodovým poměrem

Abstract

This diploma thesis discusses the design and verification of one cell of a multilevel DC-DC converter operating with a large range of transfer ratios. In the introduction is carried out a research of selected types of DC-DC converters, focusing on converters capable of operating with a high transfer ratio and on multilevel topologies. Subsequently is performed an analysis of the selected topology of a multilevel converter based on a distributed intermediate circuit, with a flyback converter, with parallel-connected outputs to a common output circuit, being connected to each element of the intermediate circuit. Next is carried out the design of one cell of this topology, consisting of the design of the power and control circuit, including the power supply of the control circuit. Subsequently, suitable components were selected, a transformer was designed and a printed circuit board was created. In the last part, one cell of the multilevel converter was constructed, on which the design was experimentally verified. The measurement results confirmed the functionality in the required range of input voltages and verified the control principle based on limiting the peak value of the primary winding current at a constant switching period. The thesis points out the possibilities and limitations of the proposed solution and creates a basis for further development of the multilevel DC-DC converter for applications with a large range of transmission ratios.