AC EV Charger working principle

The working principle of the AC charging station is to connect to the AC power grid and provide AC power supply for the on-board charger of new energy vehicles. 

The AC charging station itself does not have a charging function, but only controls the power supply. 

Due to the relatively low power of the on-board charger, most of the charging speeds for 3.5kw and 7kw AC stations are popular and enough for EV. 

When an electric vehicle is parked in the area of an AC charging station and the body is connected to the charging station port, the air switch will automatically close and the power indicator light will light up. After pressing the start button, the air switch will open circuit and the electric vehicle will charge normally.

The difference in charging principles between AC charging and DC charging is as follows:

• Charging method: AC charging is a charging method that uses an AC power source to provide electricity for electric vehicles, while DC charging refers to the charging behavior of charging devices rectifying the AC power from the grid and then inputting it into the vehicle.

• Charging power: AC charging power is generally small, also known as slow charging; DC charging has a higher power, so it is also known as fast charging.

• Charging process: AC charging requires the use of an AC charging station, which needs to pass through two levels: the onboard charger and the battery management system; DC charging requires the use of DC charging stations.

• Charging interface: There are generally two types of charging sockets on electric vehicles, a 7-hole AC socket and a 9-hole DC socket.