Transformerless Partial Power AC-Link Step-Down Converter

Rodrigo A. Bugueño, Hugues Renaudineau, Ana M. Llor and Christian A. Rojas ()
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Rodrigo A. Bugueño: Department of Electronics, Universidad Técnica Federico Santa María, Valparaíso 2390123, Chile
Hugues Renaudineau: Department of Electronics, Universidad Técnica Federico Santa María, Valparaíso 2390123, Chile
Ana M. Llor: Department of Electronics, Universidad Técnica Federico Santa María, Valparaíso 2390123, Chile
Christian A. Rojas: Department of Electronics, Universidad Técnica Federico Santa María, Valparaíso 2390123, Chile

Mathematics, 2024, vol. 12, issue 13, 1-15

Abstract: DC–DC power converters are essential for various applications, including photovoltaic systems, green hydrogen production, battery charging, and DC microgrids. Partial Power Converters (PPC) are notable for their efficiency, processing only a fraction of total power and reducing conversion losses, but this performance is overshadowed by the high cost of its construction, associated with high-frequency transformers (HFT). This paper introduces a transformerless partial power AC-link step-down converter, eliminating the need for an HFT and reducing costs while improving power density. An experimental validation using a reduced-scale prototype demonstrates the converter’s operation with a peak efficiency of 93.2% and overall efficiency above 92%, demonstrating the experimental viability of the converter. The proposed AC-link seen as a two-port network is shown to be very attractive for DC–DC step-down operations, and as a possible replacement of traditional PPC.

Keywords: DC–DC converter; non-isolated full-bridge converter; partial power converter; transformerless AC-link (search for similar items in EconPapers)
JEL-codes: C (search for similar items in EconPapers)
Date: 2024
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