A novel DC–DC boost converter topology and its performance analysis: high step-up ratio with low device stress

Abstract

With the continuous advancement of the “carbon peaking and carbon neutrality” goals, grid-connected renewable energy generation technologies have developed rapidly, among which high step-up DC–DC converters have become a key enabling component. Based on the cascaded structure of Buck–Boost and Boost converters, this paper introduces an improved voltage-lift unit and proposes a novel high step-up DC–DC converter with low device voltage stress through topology reconfiguration and coupled design. For the proposed topology, the operating modes and energy transfer mechanisms are systematically analyzed, key electrical parameters are derived, and the voltage stresses of switches, diodes, and capacitors are quantitatively evaluated. Furthermore, the proposed converter is compared with the conventional Boost converter, the cascaded Buck–Boost/Boost converter, and the improved voltage-lift Boost converter in terms of voltage gain and device stress characteristics. The results demonstrate that the proposed topology achieves a high voltage gain while significantly reducing the voltage stress on switching devices and energy storage components, thereby reducing conduction and switching losses, improving system efficiency and power density, and showing promising potential for practical applications.