A New Non-Isolated Common-Ground High StepUp Converter Adopts Cascaded and Voltage Stacked Techniques

This article proposes a non-isolated commonground high step-up converter that adopts cascaded and voltage stacked techniques. In the proposed architecture, the output from the first stage is fed into the second stage, and the output voltages of each stage are further stacked to achieve an extended voltage gain. This topology enables ultra-high voltage conversion without requiring extreme duty ratios, and offers additional advantages such as a simple circuit structure, reduced component count, and lower overall cost. The designed converter steps up a 36 V input to a 400 V output, operates at 50 kHz, and delivers a rated power of 400 W. Detailed analyses of the operating principles, steady-state behavior, and voltage gain derivation are presented. A hardware prototype was developed and tested, demonstrating a peak efficiency of 93.4%.