AC EV Charger/DC Electric Car Charging Pile Control Flowchart

#EV Charging Stations / Detailed Explanation of the AC Charging Process

During the AC charging process, the first step is to ensure that a connection has been established between the vehicle and the EV charging station. Once the connection is successfully established, the Electric Vehicle Charging Controller (EVCC) sends a request to the Supply Equipment Charging Controller (SECC) to initiate charging. Upon receiving this request, the SECC performs a series of verification and preparatory checks to ensure the safety and efficiency of the charging session. If all checks are successful, the SECC sends a confirmation message back to the EVCC, signaling that charging may begin. At this point, the charging process officially commences, and electrical energy is transmitted to the vehicle’s battery via interfaces such as the Neutral (N) line, L1 (AC single-phase), and L2/L3 (AC three-phase). Throughout the charging session, the EVCC continuously monitors the charging status and maintains communication with the SECC to ensure the process proceeds smoothly. Once charging is complete, the SECC sends a termination message to the EVCC, bringing the charging process to a close.

#EV Charging Stations / Detailed Explanation of the DC Charging Process

During the DC charging process, the first step is to ensure that a secure connection has been established between the vehicle and the DC fast charging station. Similar to AC charging, the Electric Vehicle Charging Controller (EVCC) sends a request to initiate charging to the Station-side Charging Controller (SECC). The key difference, however, is that DC charging utilizes a method of power transmission involving significantly higher voltages and currents. Once the SECC confirms the request and initiates the session, electrical energy is transmitted directly into the vehicle’s battery via the DC interface. Throughout this process, the EVCC continuously monitors the system and maintains active communication with the SECC to ensure the safety and efficiency of the charging operation. Upon completion of the charging session, the SECC notifies the EVCC to terminate the process, thereby bringing the entire DC charging cycle to a close.