Design and Development of fuzzy based optimal Battery Charger

The charging method has a significant influence on the performance and lifetime of Rechargeable batteries. Therefore intelligent charging algorithm which can properly determine the charging current is essential. In this study, a fuzzy-logic-control-based (FLC-based) battery charger is proposed. The proposed charger takes the voltage and current of battery into account, and adjusts the pwm duty cycle accordingly. To further improve the performance of the proposed FLC, the fuzzy-based mamdani method is utilized to determine the optimal output membership functions (MFs). Comparing with the conventional constant current-constant voltage (CC-CV) method, the charging time, charging efficiency, average temperature rise and the obtained cycle life of the Li-ion battery are improved by the proposed system also the Fuzzy Logic Controller keeps the State Of Charge within limits which also enhances the life time of the battery.