Asymmetrical quasi-Z-source half-bridge DC-DC converters

This paper presents a novel quasi-Z-source half-bridge DC-DC converter family derived by a combination of the single-switch qZS DC-DC converter and the half-bridge galvanically isolated DC-DC converter. The novel topologies have only two active switches and are a cheaper alternative to the galvanically isolated quasi-Z-source DC-DC converters with a full-bridge switching stage. Such promising features as circuit simplicity, low cost, high efficiency, and high reliability are attributed to the new alternative solution. A 200W prototype was assembled and tested. Simulation and experimental results are presented to verify the step-up performance of the topology.