Fuzzy-Logic Based Fast-Charger Design For Lithium Polymer Battery Charging

Electrical energy usage is significant in Indonesia, driven by the growing dependence on electronic devices, with batteries used for energy storage in appliances. Continuous battery use reduces capacity, prompting electronics manufacturers to enhance battery capacity with lithium batteries. The battery recharging process is defined by optimal time and efficiency for immediate device use. However, long charging times and high temperatures during charging can damage the battery. This research aims to create a method for fast-charging Lithium Polymer batteries. A fuzzy logic control system will be employed to regulate the voltage and current, as well as to maintain the battery temperature within an optimal range. The regulation of the charger voltage is achieved through an increase from the PWM-generated output voltage of 12.6 Volts to a maximum of 13.5 Volts, thereby facilitating a more expeditious charging of the Lithium Polymer battery. The optimal time for fast battery charging with fuzzy logic control is 55 minutes, with the first temperature of 28.38°C and the second temperature of 28.44°C. Meanwhile, without control, the optimal charging time is 45 minutes, with the first temperature of 37.69°C and the second temperature of 37.60°C. Nevertheless, a fuzzy control system for battery charging is designed to reduce the temperature of the battery to a level that will not overload it and extend its lifespan.