International Journal of Technology and Applied Science

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Volume 17 Issue 10
October 2026

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Design and development of reconfigurable bidirectional isolated DC-DC converter for wide voltage range electric vehicle charging application

Author(s) Ms. ISHA RANI
Country India
Abstract The escalating global adoption of electric vehicles (EVs) demands high-performance, flexible charging infrastructure capable of operating across wide battery voltage ranges. Conventional fixed-topology EV chargers exhibit significant efficiency degradation when operating outside their optimized voltage window. This paper presents the design and simulation of a reconfigurable bidirectional isolated DC-DC converter integrated with a three-phase Voltage Source Converter (VSC) front-end for EV charging applications spanning 200 V to 800 V. The DC-DC stage employs a dynamically reconfigurable LLC resonant topology capable of operating in Dual Active Bridge (DAB), Full-Bridge LLC (FB-LLC), and Half-Bridge LLC (HB-LLC) modes, selected adaptively based on runtime conditions. Zero Voltage Switching (ZVS) is maintained across the full voltage range through combined frequency and phase-shift modulation. The AC-DC stage uses Synchronous Reference Frame (SRF) control to achieve near-unity power factor and DC bus regulation at 800 V. MATLAB/Simulink simulation validates the proposed system, demonstrating efficiency exceeding 95%, input current THD below 3%, and robust performance under load transitions and mode-switching events. The reconfigurable architecture outperforms fixed-topology converters in flexibility and efficiency across dynamic EV charging conditions.
Keywords Bidirectional DC-DC converter, dual active bridge, electric vehicle charging, LLC resonant converter, reconfigurable topology, synchronous reference frame control, zero voltage switching, vehicle-to-grid
Field Engineering
Published In Volume 17, Issue 7, July 2026
Published On 2026-07-13
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Crossref DOI prefix of IJTAS is 10.71097/IJTAS

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