A novel step-up converter with lower ripple and RHP zero elimination

This paper presents a novel step-up converter with ultralow output ripple and right-half-plane(RHP) zero elimination, making it well-suited for high-precision and high-reliability boost applications. The equivalent circuit of the proposed topology is established using the equivalent model of the transformer. Based on this model, a systematic analysis reveals that the proposed topology is functionally equivalent to cascaded Buck converters superimposed with the input DC voltage, where the number of stages is dictated by the transformer turns ratio. As a result, the proposed converter offers a linear boost characteristic while inheriting the advantages of Buck converters. Compared to existing methods for eliminating RHP zeros, this topology exhibits superior overall performance, including reduced voltage stress of semiconductors, a lower component count, and a simplified circuit structure. In addition, unlike conventional interleaved parallel boost converters that mitigate output ripple through structural redundancy, the proposed approach suppresses output voltage ripple naturally. Theoretical steady-state performance is experimentally validated using a semi-physical platform under various operating conditions.