Work

A High Step-Down Isolated DC-DC Converter with Low Voltage Stress on MOSFETS and Low Output Voltage Ripple

Year: 2026

Type: conference-paper

Abstract: This paper presents a two-stacked half-bridge DC-DC converter that enables reduced MOSFET voltage stress, increased effective frequency and reduced pulse amplitude seen by the output low-pass filter. The proposed eight-state modulation strategy enables a reduction in passive component size for a given ripple specification while maintaining high step-down capability, whereas the voltage stress reduction of the MOSFETs allows the use of devices with a better figure of merit. A detailed analysis of the self-balancing mechanism of the input split capacitors and the DC-blocking capacitor is provided, addressing the limited understanding of capacitor voltage balancing mechanism reported in the literature. A 500-W, 380-V/48-V, 100-kHz experimental prototype has been developed to validate the proposed topology and modulation scheme, achieving a peak efficiency of 95.1% and full-load efficiency of 92.5%.

Source: Energy Conversion Congress and Expo Europe (ECCE Europe)

DOI: 10.1109/ecceeurope67962.2026.11738228

Authors: Pablo M. Gil, Juan R. García-Meré, Sarah Saeed, Juan Rodríguez

Institution: Universidad de Oviedo

Language: English

Topic: Advanced DC-DC Converters

Subfield: Electrical and Electronic Engineering

Field: Engineering

Domain: Physical Sciences

SDGs: Affordable and clean energy, Industry, innovation and infrastructure

Open Access status: hybrid

Funder: Fundación para el Fomento en Asturias de la Investigación Científica Aplicada y la Tecnología