Active Damping of Filter Based Dab Converter for CC-CV Controlled Ev Fast Charging Applications

Dual Active Bridge (DAB) converter is well suited for off-board fast Electric Vehicle Charging Stations (EVCS) and in DC microgrid-connected EVCS applications. However, proper modification in DAB converter topology is crucial for fast charging, as the charging current is very high, and any oscillations would shorten the EV battery life. As per literature, DAB converter topology integrated with a series inductor at the output for EV battery charging reduces the output current ripple by 40%. Therefore, the equipment needs energy storage. The battery has an important role in energy storage with the performance of the battery that needs attention. The method and type of battery used must be considered to maintain battery lifetime and reduce overcharging. The purpose of this research is to understand the process of fast charging using the CC-CV (Constant Current Constant Voltage) method on Lithium-Ion batteries which is expected to reduce battery overcharging. In this method, the current is maintained constant until certain conditions then followed by constant voltage to prevent overcharging. The voltage from the solar panel is very high, voltage reduction is needed as the charging voltage for the battery.