Three-level half-bridge ZVS DC/DC converter for electrolyzer integration with renewable energy systems

This paper presents findings of a R&D project targeted to the development of a galvanically isolated step-down DC/DC converter for electrolyzer integration with renewable energy systems. The topology proposed is a three-level neutral point clamped half-bridge with a high-frequency isolation transformer and a current doubler rectifier that fulfils all the targets set by the designers. Despite an increased component count the proposed converter is very simple in design and operation. The paper outlines the design with several recommendations and guidelines, and also discusses the experimental results obtained.