Design and Simulation of a Bidirectional Two-Stage DC/DC Converter with Partial Switch Sharing for Vehicle-to-Vehicle Charging Applications

This study evaluates a 4 kW, 100 kHz isolated bidirectional DC/DC converter for vehicle-to-vehicle (V2V) charging between 1200 V and 400–800 V batteries. Partial switch sharing integrates a four-switch buck–boost stage and a dual active half-bridge converter using six active switches. Duty-cycle and single-phase-shift modulation enable voltage regulation and bidirectional power transfer. Operating modes, steady-state characteristics, component design, and MOSFET zero-voltage-switching current-polarity margins are analyzed. Cascaded PI and PI-assisted 45-rule Mamdani fuzzy controllers are compared in MATLAB/Simulink across four voltage-transfer conditions and 4-to-2 kW power steps. Simulated full-load efficiencies range from 90.55% to 98.06%. Fuzzy control achieves 6–12 ms settling times versus 0.65–0.89 s for cascaded PI. The findings indicate feasible isolated V2V energy transfer and faster simulated transient regulation with fuzzy control.