Bidirectional Non-isolated DC–DC Converter with Soft-Switching Capability for Electric Vehicles
摘要
Soft-switching techniques are particularly relevant and beneficial for converters used in electric vehicles (EVs). EVs rely on various types of power converters to efficiently manage energy flow between different components such as batteries, motors, and other subsystems. This work proposes a non-isolated half bridge topology-based bidirectional soft-switched DC–DC converter. The converter regulates the power flow between battery pack and traction motor in either direction by balancing the voltage levels at both of its ends. Soft switching lowers power loss and increases range, which is one of the primary requirements for EVs. Reduction in switching loss will boost the converter’s effectiveness, allowing more battery energy to be used for drive during regular vehicle operation. Additionally, more regenerated energy can be stored in the battery during regenerative braking. Through simulation, the system performance is confirmed. A 250 W converter is used for simulating the soft-switching action, and it is found to be consistent with the waveforms produced by the theoretical study. Comparing it to the traditional hard-switched converter allows for performance evaluation. The maximum efficiency at full load in both the boost and buck modes is evaluated at 97.17% and 96.73%, respectively.