Adaptive Constant Current and Voltage Charging for Lead-Acid Battery Using Zeta Converter

¹ Department of Electrical Engineering, Politeknik Elektronika Negeri Surabaya, 60111 Surabaya, Indonesia
² Department of Life Science and Systems Engineering, Kyushu Institute of Technology, Kitakyushu 808-0196, Japan

^* Corresponding author: renny@pens.ac.id

Abstract

In areas with unstable PLN electricity supply, the need for an energy storage system becomes very important, especially for charging devices such as mobile phones or laptops. Lead-acid batteries can be a solution, the energy storage process must be carried out with voltage settings that match the characteristics of the battery and do not damage the battery cells. This research develops a zeta converter-based charging system combined with FLC using CC-CV. During the charging process, the output voltage is used to charge the battery by setting a constant current of 3.6 A. This is done continuously until the charging system switches to CV. Testing for 200 minutes showed that charging in CC mode at 3.6 A was achieved for 80 minutes, starting from 50% to 85% SOC. Then, when the converter voltage reached 14.4V, the charging mode switched to CV with constant output voltage, but the current decreased as the battery SOC increased from 85% to 100%, and this process took up to 120 minutes. The system efficiency ranges from 74% to 80% during the CC process and 84% during the CV process. The CC-CV regulation processes are controlled by FLC.