Design and Evaluation of Bidirectional EV Charging System
Keywords:
Dual active bridge converter, Electric vehicle charging, Grid-to-vehicle (G2V), High-frequency transformer, Power electronics, Single phase shift modulation, Vehicle-to-grid (V2G)Abstract
The increasing use of Electric Vehicles (EVs) creates a need for efficient charging systems that support bidirectional power flow, as conventional chargers only allow power to flow from the grid to the vehicle and cannot utilize the EV battery to support the grid. To address this limitation, a bidirectional Dual Active Bridge (DAB) converter is designed to enable both Grid-to-Vehicle (G2V) and Vehicle-to-Grid (V2G) operation. The converter uses Single-Phase Shift (SPS) modulation, in which the phase difference between the two full-bridge converters controls the direction and magnitude of power transfer. The system is validated through MATLAB/Simulink simulation with a 600 V input and 60 V output, demonstrating efficient energy transfer. A low-voltage hardware prototype using MOSFETs, IR2110 gate drivers, and Arduino control is developed for safe and cost-effective implementation. Experimental results confirm proper PWM generation, dead-time implementation, and stable bidirectional operation. The scalability of the system proves its suitability for practical EV charging applications.
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