TY - GEN
T1 - ZVS Analysis of an Interleaved Current-Fed DAB for Bipolar and Unipolar DC Grids
AU - Pittala, Lohith Kumar
AU - Carvalho, Edivan Laercio
AU - Ricco, Mattia
AU - Orfanoudakis, Georgios I.
AU - Kuperman, Alon
AU - Mandrioli, Riccardo
N1 - Publisher Copyright:
© 2025 IEEE.
PY - 2025/1/1
Y1 - 2025/1/1
N2 - 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.
AB - 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.
KW - bipolar grids
KW - current-fed dual active bridge (CF-DAB)
KW - interleaved inductors
KW - soft-switching
KW - unipolar grids
KW - zero voltage switching (ZVS)
UR - https://www.scopus.com/pages/publications/105041970731
U2 - 10.1109/PESGRE65581.2025.11521226
DO - 10.1109/PESGRE65581.2025.11521226
M3 - Conference contribution
AN - SCOPUS:105041970731
T3 - IEEE PESGRE 2025 - 4th IEEE International Conference on Power Electronics, Smart Grid, and Renewable Energy
BT - IEEE PESGRE 2025 - 4th IEEE International Conference on Power Electronics, Smart Grid, and Renewable Energy
PB - Institute of Electrical and Electronics Engineers
T2 - 4th IEEE International Conference on Power Electronics, Smart Grid, and Renewable Energy, PESGRE 2025
Y2 - 18 December 2025 through 21 December 2025
ER -