Solar Charge Controller for Lithium-Ion Battery

Battery charging technology has been developed over the past several years and storage of electrical energy has become a necessity, there is vast demand for compact and portable battery charger for various applications. The lithium ion batteries are finding considerable usage in both primary and secondary applications. The objective of this work is to design a low cost, versatile, efficient and compact solar powered lithium ion battery charger. The proposed battery charger circuit has features like over voltage, over charge, short circuit, reverse polarity protection for extended battery life and uses constant current and constant voltage methods of charging. P&O MPPT algorithm is used to extract maximum power from the solar panel. And buck converter is designed and built to function as a MPPT charge controller.