The 3.3KW air-cooled on-board charger assembly is a universal high-performance intelligent air-cooled charger assembly developed with a modular design concept specifically for pure electric new energy vehicles such as lithium-ion pure electric A+level passenger cars, commercial vehicles, logistics vehicles, special vehicles, and electric engineering machinery. The system is designed using fully digital control technology, with flexible and intelligent control, good protection characteristics, and strong system stability. By adopting the new generation phase-shifting and width modulation zero voltage zero current soft switching technology combined with high-performance SiC devices, the overall stability of the machine is strong, the conversion efficiency is high, and the peak efficiency can reach over 96%. The shell is made of die cast aluminum, with a 1P67 protection level and is dustproof and waterproof; All key electronic components are selected for automotive grade components. The whole machine has high power density, light weight, small size, good environmental adaptability, easy maintenance, high reliability, and long service life. It can fully meet various charging application scenarios of new energy vehicles.