Volume: 1 Issue 7 [December 2018]

Article:Low Cost 12V Lead Acid Battery Intelligent Charger

Author: Abdullah Al Kawsar, Sajid Muhaimeen Chowdhur

Volume: Volume 1, Issue 7; December-2018

DOI: 2018 : 1 (7) : 130-143

Abstract: An ordinary 12V lead acid battery charger not having any intelligence, charges the battery with random voltage/current. Sometimes charging a 12V lead acid battery, it absorbs high current. Which damages its long life and it is undesirable. For battery long life, we provided an intelligent charger that will charge the battery intelligently by measuring and controlling current & voltage. Actually, the charger fixes the current & voltage whenever needed by changing its duty cycle. A PIC16F690 with necessary program is used to provide intelligence of the charger. The charger uses closed-loop feedback control of battery current to automatically regulate the charging voltage using buck conversion. The charging state starts with constant current then it continues with constant voltage until decreases current ratting and eventually voltage also decreases to a float value till charging complete. Since it is a microcontroller and chip based project and having longevity of battery life, the charger is proven as cost effective. An LCD can show us the input variation time to time. The entire system has been simulated and the final design has been constructed in breadboard to measure performance. A PCB of the design is also done.

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