Intelligent charging device based on multi-resonant topology

The invention relates to an intelligent charging device based on multi-resonant topology. The intelligent charging device comprises an AC/DC (alternating current/direct current) converting unit, a DC/DC converting unit, a controller, a charging protection unit and an auxiliary power source, wherein the AC/DC converting unit comprises an input protection module, an input filtering module, a surge suppression module and an AC/DC conversion rectification filtering module, the DC/DC converting module comprises a resonant module and a DC/DC conversion rectification filtering module, and the charging protection unit comprises an output overcurrent protection module, an output current-limiting protection module, an output overvoltage protection module and an input overvoltage and undervoltage protection module. The intelligent charging device based on the multi-resonant topology is simple to operate, high in universality, capable of charging batteries intelligently and higher than 90% in overall efficiency.