An Isolated Bidirectional Soft-Switching DC-DC Converter for Wide Input/Output Voltage Range

Giorgio Spiazzi (), Leopoldo Rossetto, Paolo Mattavelli, Ezio Gallo and Filip Cvejic
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Giorgio Spiazzi: Department of Information Engineering, University of Padova, 35131 Padova, Italy
Leopoldo Rossetto: Department of Information Engineering, University of Padova, 35131 Padova, Italy
Paolo Mattavelli: Department of Management and Engineering, University of Padova, 36100 Vicenza, Italy
Ezio Gallo: Department of Management and Engineering, University of Padova, 36100 Vicenza, Italy
Filip Cvejic: Department of Information Engineering, University of Padova, 35131 Padova, Italy

Energies, 2024, vol. 17, issue 23, 1-21

Abstract: This paper presents the analysis and design of an isolated bidirectional DC-DC converter for applications where both input and output voltages may vary in a wide range. The proposed topology is derived from the integration of an isolated Current-Fed Dual-Active-Bridge (CF-DAB) stage with a Four-Switch Buck-Boost cell (4SBB), sharing one switching leg. Detailed design procedures are outlined for both CF-DAB and 4SBB stages, allowing to achieve Zero-Voltage turn-on of all devices while minimizing the inductor current RMS values. An optimized design of the CF-DAB coupled inductors allowed to achieve the desired leakage inductance value without the need for an additional magnetic component. Experimental results taken on a 5 kW prototype interfacing two voltage ports with V L ∈ [42 V, 72 V], V H ∈ [225 V, 435 V] validate the proposed design procedure.

Keywords: isolated DC-DC converters; current-fed dual-active-bridge; four-switch buck-boost (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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