IEEE PESGRE2025 SYPA Winner - ZVS Analysis of an Interleaved CF-DAB Converter

Описание: This video presentation describes the work in the paper titled: ZVS Analysis of an Interleaved Current-Fed DAB for Bipolar and Unipolar DC Grids.

Authors and Affiliations:
Lohith Kumar Pittala from the University of Bologna, Italy
Edivan Laercio Carvalho from the Tallinn University of Technology, Estonia
Mattia Ricco from the University of Bologna, Italy
Georgios I. Orfanoudakis from the Hellenic Mediterranean University, Greece
Alon Kuperman from Ben Gurion University of the Negev, Israel
Riccardo Mandrioli from the University of Bologna, Italy

Paper Abstract:
This paper presents a comprehensive zero-voltage switching (ZVS) analysis of an interleaved current-fed dual active bridge (CF-DAB) converter under single-phase-shift control, targeting both bipolar and unipolar DC microgrids. Compared to conventional ZVS conditions, the presence of interphase inductors, either at the input or output bridges, enables an extended ZVS region, particularly under light-load conditions. This is important to increase the overall system efficiency, since in many applications, including DC microgrids, most of the time, such a converter operates at partial load. In addition, for unipolar DC microgrids and balanced bipolar systems, the interphase inductor currents may exhibit a DC offset or remain centered around zero, while under unbalanced load conditions, a DC offset is resulted. To cover both cases, analytical ZVS boundary expressions are derived for both scenarios: with and without DC offset. Experimental validation is conducted on a 300 W scaled-down prototype for the no-offset case, confirming that the CF-DAB can achieve reliable soft-switching over a wide voltage gain range with appropriate inductor design.