直流充电桩工作原理：三相380V交流电经过EMC等防雷滤波模块后进入到三相四线制电表中，三相四线制电表监控整个充电机工作时的实际充电电量。且根据实际充电电流及充电电压的大小，充电机往往需要并联使用，因此就要求充电机拥有能够均流输出的功能，充电机输出经过充电枪直接给动力电池进行充电。 Dc charging pile working principle: the three-phase 380 v alternating current (ac) after EMC and lightning protection filter module into the three phase four wire electric meter, three phase four wire electric meter to monitor the whole actual rechargeable battery charger to work. And according to the size of the actual charging current and charging voltage, charging machine often need to use in parallel, thus requires charging machine can have the function of the output current, charging machine output after charging gun directly to power battery recharged. 在直流充电桩工作时，辅助电源给主控单元、显示模块、保护控制单元、信号采集单元及刷卡模块等控制系统进行供电。另外，在动力电池充电过程中，辅助电源给BMS系统供电，由BMS系统实时监控动力电池的状态。 When working in dc charging pile, the auxiliary power supply to main control unit, a display module, protection and control unit, signal acquisition unit and credit control system for power supply module, etc. In addition, during the power battery charging process, the auxiliary power supply is supplied to the BMS system, and the BMS system monitors the state of the power cell in real time.