Design and Simulation of Non-isolated Bidirectional DC-DC Converter for Vehicle Application
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Abstract
This paper presents the design and simulation of a non-isolated bidirectional DC–DC converter for electric vehicle (EV) applications, focusing on efficient energy transfer between the battery and DC bus. The proposed system integrates a battery energy storage unit with a bidirectional converter that operates in both buck mode (charging) and boost mode (discharging) to support vehicle operation and regenerative energy management. The model is developed and analyzed in MATLAB/Simulink using appropriate control strategies based on pulse width modulation (PWM). The performance of the system is evaluated under different operating conditions, including varying state of charge (SOC) levels, battery charging and discharging characteristics, DC link voltage stability, and load current response. The results demonstrate that the converter ensures smooth and efficient bidirectional power flow, with stable DC link voltage and minimal ripple. The SOC analysis confirms effective charging at lower levels and controlled charging near full capacity, preventing overcharging and enhancing battery life. During discharging, the system provides a consistent and reliable power supply to the load. the proposed non-isolated bidirectional DC–DC converter exhibits high efficiency, reliable operation, and effective energy management, making it suitable for electric vehicle applications, include battery management systems, regenerative braking, and auxiliary power support.
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