AC charging pile is a kind of charging equipment designed for electric vehicles, mainly by providing stable AC power to the on-board charger on the electric vehicle, and then realising the slow-speed charging of electric vehicles. This charging method occupies an important position in the market for its economy and convenience. The technology and structure of AC charging Posts are relatively simple and the manufacturing cost is low, so the price is affordable and suitable for wide application in residential districts, commercial car parks, public places and other scenarios. It not only meets the daily charging needs of electric vehicle users, but also provides value-added services for car parks and other venues, enhancing user experience. In addition, the AC charger has less impact on the grid load, which is conducive to the stable operation of the grid. It does not require complex power conversion equipment, and only needs to supply AC power from the grid directly to the on-board charger, which reduces energy loss and grid pressure.