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Hard- and Soft-Switched

D24.8 - High Step-Up DC-DC Converters Based on Modified Boost and SEPIC Converters in Cascaded and Integrated Versions

Thursday, March 26, 2026
12:00 PM - 1:45 PM CT
Location: Hemisfair Ballroom
This paper investigates two non-isolated DC-DC converter topologies with high static voltage gain, derived from modified Boost and SEPIC converters in cascaded and integrated versions. The cascaded topology employs two active switches, whereas the integrated topology requires only a single switch. The proposed converters exhibit high voltage gains (>8), making them attractive for applications that demand a reduced component count, a common ground between input and output, and simplified control and drive circuitry. The paper provides a comprehensive derivation of both topologies and a detailed analysis of their operating principles, including key topological stages and ideal waveforms. A comparative assessment with related converter architectures previously reported in the literature is also presented. To validate the proposed concepts, two 200 W prototypes were developed and experimentally tested, designed for operation with an input voltage of 26 V and an output voltage of 260 V. The converters operate at a switching frequency of 50 kHz, achieving peak efficiencies of 93.4% for the cascaded topology and 89.2% for the integrated topology under rated power conditions.