Synthesis of Integrated Multiport DC-DC Converters With Reduced Switches

With the increasing demand of different voltage levels in industrial applications, multiport dc-dc converters have been widely employed owing to their low-cost merits. Aiming to provide more multiport topologies so that engineers can select out a preferred one for the specified application, this article proposes a novel principle to systematically implement topology derivation by replacing switches in original converters with pulsating current source cells. This principle is simple and effective, with which multiple new integrated multiport converters having a low number of switches are easily evolved. The advantage of reduced switches is very beneficial for the low-power applications with relatively less switches since the overall cost can be effectively improved. And in order to achieve a comprehensive understanding of the proposed converters, an example single-input dual-output converter that integrates the asymmetrical half-bridge flyback converter with the buck converter is analyzed in detail. It operates similarly with the two separate converters, but with favorable advantages of reduced switches and improved switching operation. Finally, an experimental prototype is built to verify the theoretical analysis.