Ac charging pile is ac electric vehicle charging pile, commonly known as "slow", fixed installed in electric cars, and communication power grid connection, for electric cars, car charger (i.e., installed on the electric car charger) provide the ac power supply device.   Ac charging pile only provides power output, there is no charging function, need to connect car-mounted charger for electric vehicle charging. The equivalent of just ACTS as a control power supply. 

Charging pile is divided into ac and dc charging pile pile.   Communication pile single-phase/three-phase alternating current output through the car charger converts dc to car battery, power generally small (such as there are 7 kw, 22 kw and 40 kw power), charging speed is generally slow, so the general installation area in the parking lot, etc.(2) dc charging pile:   dc electric vehicle charging station, is commonly known as the "quick charge", it is installed in electric cars, grid connection and communication, can provide the vehicle electric vehicle power battery with dc power supply device. 

The input voltage of dc charging pile using three phase four wire AC 380 V + 15%, frequency 50 hz, the output is adjustable dc, power battery for electric vehicle charging directly.   Due to the dc charging pile, power is supplied by three phase four wire system can provide enough power, wide adjustment range of the output voltage and current, can realize the requirement of quick charge.