Half-bridge three-stage charger solution based on EG1165, EG4320, and EG1516 chips, with an input voltage of AC 220V±20%, capable of providing constant current charging of 10.0A±0.1A, constant voltage DC 87V±0.5V, and float charging DC 82.5V±0.5V for a 72V lead-acid battery, equipped with various protection and control functions, featuring LED charge indicator lights and a 12V 0.2A fan interface, achieving control of each charging stage through specific circuit principles to meet the charging needs of electric vehicles.