RT Journal Article
T1 A Novel Transformerless Soft-Switching Symmetrical Bipolar Power Converter: Analysis, Design, Simulation and Validation
A1 Díaz Martín, Cristian
A1 Durán Aranda, Eladio
A1 Alves da Silva, Fernando
A1 André, Sergio
AB In order to obtain acceptable efficiencies, hard-switching techniques and the converters that implement them must operate at relatively low frequencies (tens of kilohertz), which translate into converters of large size, weight, and volume, and therefore higher cost. To improve these characteristics, this work introduces a new transformerless MHz-range DC–DC converter that provides symmetrical bipolar outputs. The developed topology uses a single grounded switch, achieves soft switching (ZVS) over a wide load range, and does not require the use of floating or isolated controllers, reducing cost, size, and complexity. The output voltages are self-regulated to maintain the same value, ensuring balanced bipolar operation. A comprehensive analysis, design, sizing, simulation, implementation and testing are provided on a 150Wprototype operating at a switching frequency of 1 MHz, with step-up and step-down capability and implemented with GaN FET. The evaluated configuration shows an efficiency close to 90% and high power density, making it suitable for compact designs in a variety of applications requiring reliable power  management and high efficiency such as lighting, electric vehicles, or auxiliary power supplies. 
PB MDPI
SN 2079-9292 (electrónico)
YR 2025
FD 2025-04
LK https://hdl.handle.net/10272/25361
UL https://hdl.handle.net/10272/25361
LA eng
NO Díaz-Martín, C., Durán Aranda, E., da Silva, F. A., & André, S. (2025). A Novel Transformerless Soft-Switching Symmetrical Bipolar Power Converter: Analysis, Design, Simulation and Validation. In Electronics (Vol. 14, Issue 7, p. 1434). MDPI AG. https://doi.org/10.3390/electronics14071434
NO This research was funded by EPIT24 Santander–UHU: Mobility grants for internationalstays for PhD students at the University of Huelva and by national funds through FCT, Fundaçãopara a Ciência e a Tecnologia, under project UIDB/50021/2020 (DOI:10.54499/UIDB/50021/2020).The corresponding author is enjoying an FPU grant funded by the Spanish Ministry of Universitiesfor training of university teaching staff in his PhD period, grant number FPU22/03537.
DS Repositorio Institucional de la Universidad de Huelva
RD 30 may 2026