使用7kW AC充電樁的原理主要基於電能轉換和傳輸技術。 Specifically, this kind of charging pile inputs household 220V AC power into the interior of the charging pile, and through internal rectification, filtering and other processing, converts the AC power into DC power suitable for charging electric vehicles. Then, through the charging ports (including plugs and sockets) of the charging pile, the electric energy is transmitted to the battery of the electric vehicle, thus realising the charging of the electric vehicle.