The increasing adoption of electric vehicles (EVs) has created a growing demand for efficient bidirectional power conversion systems capable of supporting battery charging and energy transfer from the battery to the DC bus. This paper presents the design, mathematical modeling, and simulation of a non-isolated bidirectional buck-boost DC-DC converter for EV battery applications. The converter is designed for a rated power of 5 kW using a 350 V lithium-ion battery and a 450 V DC bus, with a switching frequency of 5 kHz. The passive components are analytically designed based on the specified operating conditions and continuous conduction mode (CCM) requirements. A closed-loop proportional-integral (PI) current controller is employed to regulate the battery current and enable bidirectional power flow between the battery and the DC bus. The converter performance is evaluated under different current-reference levels and during a dynamic transition between discharging and charging modes. The simulation results demonstrate effective current tracking and successful reversal of power flow, as indicated by the battery-current direction and corresponding state-of-charge response. The battery voltage remains stable during the operating-mode transition, while the inductor-current response is evaluated to verify CCM operation. The results demonstrate the feasibility of the proposed PI-controlled bidirectional DC-DC converter as a DC-side battery interface for EV charging and energy-transfer applications.
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