交流充电桩给电动汽车的充电机提供电力输入，由于一般的车载充电机的功率不是很大，所以不能很好的实现快速充电。但我们可以采用直流充电桩来实现快充。
AC charging piles provide power input for electric vehicle chargers. Because the power of general vehicle chargers is not very large, it can not achieve fast charging. But we can use DC charging pile to realize fast charging.
直流充电桩是固定安装在电动汽车外、与交流电网连接，可以为非车载电动汽车动力电池提供直流电源的供电装置。直流充电桩的输入电压采用三相四线AC380V±15%，频率50Hz,输出为可调直流电，直接为电动汽车的动力电池充电。由于直流充电桩采用三相四线制供电，可以提供足够的功率，输出的电压和电流调整范围大，可以实现快充的要求。
The DC charging pile is fixed outside the electric vehicle and connected with the AC network. It can provide DC power supply for the power battery of the non-vehicle electric vehicle. The input voltage of DC charging pile is three-phase four-wire AC380V (+15%) and the frequency is 50Hz. The output of DC charging pile is adjustable, which directly charges the power battery of electric vehicle. Because DC charging pile is powered by three-phase four-wire system, it can provide enough power, and the output voltage and current can be adjusted in a wide range, which can meet the requirement of fast charging.