Magnetically Integrated Onboard Charger and DCDC Converter For Electric Vehicle

Multi winding-based converter for electric vehicle (EV) charging systems enables improved power density by integrating onboard chargers (OBC) and DC-DC systems. Triple Active Bridge (TAB) based topology is employed in this system for the integration of high voltage DC (HV DC) and low voltage DC (LV DC) converters, which allows electrical and magnetic integration of both converters into a single power topology. In EV charging system, HV DC power stage is employed for HV battery charging and LV DC power stage is employed for LV battery charging. A TAB converter used in the power stages of EV charging must be capable of functioning in various modes, such as charging, driving, and vehicle-to-grid. Each port of TAB will undergo simultaneous or independent activation during these modes of operation. In this work, a 7.4kW OBC and 2kW DCDC integrated system is designed, and functionality is analyzed with various modes of operation using MATLAB Simulink environment.