Design, Construction and Evaluation of 5A AC-DC Portable Lead Acid Battery Charger with an Inbuilt Automatic Shut OFF

Abstract

Battery charger is a system that restores battery after being discharged. It is well known that battery can be destroyed for being discharged below its manufacturers specified discharge voltage limit, when left for some hours. A single switch fly back buck converter that enables battery charging from the alternating current (AC) supply is designed, and constructed. To prevent the battery from overcharging an automatic charge controller was added to the design. Size of the charger was minimised by designing it to operate at higher frequency. It has an input potential difference (PD) from 80 to 250 volt. The circuit components and other design materials were chosen based on their simplicity and availability in most of the electronics shops. Red light emitting diode (LED) is ON when the charger is connected to the mains supply while the green LED is ON when charging is cut OFF or completed. The design was first conducted on MULTISIM software to ascertain the working conditions of the circuits before the construction procedure. Performance analysis was carried out and found working appropriately.