Qianxinan Electric Vehicle Maintenance Project

The scheme of the charger in the ground charging station, which is composed of a rectifier that can convert the input AC power into DC power and a power converter that can adjust the DC power. By inserting the plug with wires into the supporting socket on the electric vehicle, DC power is input into the battery to charge it. The charger is equipped with a locking lever to facilitate the insertion and removal of the plug. At the same time, the lever can also provide a signal to confirm that it has been locked to ensure safety. According to the communication between the charger and the on-board battery management system, the power converter can adjust the DC charging power online, and the charger can display the charging voltage, charging current, charging amount and charging cost. This is just the basic principle of the charging pile. Many details should be constantly improved in practical application, and a convenient use scheme has been obtained.

Qianxinan Electric Vehicle Maintenance Project

The function of the charging post is similar to that of the gas dispenser in the gas station. It can be fixed on the ground or wall, installed in public buildings (public buildings, shopping malls, public parking lots, etc.) and residential parking lots or charging stations, and can charge various types of electric vehicles according to different voltage levels. The input end of the charging pile is directly connected with the AC power grid, and the output end is equipped with a charging plug for charging the electric vehicle. Generally, the charging pile provides two charging methods: conventional charging and fast charging. People can use a specific charging card to swipe the card on the human-computer interaction interface provided by the charging pile to print the corresponding charging method, charging time, cost data and other operations. The charging pile display screen can display the charging amount, cost, charging time and other data.

Qianxinan Electric Vehicle Maintenance Project

3. Power requirements: ① Input voltage: single-phase 220V; ② Output power: single-phase 220V/5KW; ③ Frequency: 50Hz ± 2Hz; ④ Allowable voltage fluctuation range: single-phase 220V ± 15%; 4. Electrical requirements: ① After the correct connection of plug and socket is confirmed to be successful, the circuit that can be opened and closed with load can be closed to supply power to the socket; ② The leakage protection device shall be installed on the incoming side of the power supply cable; ③ The protection of low-voltage distribution equipment and lines shall meet the relevant provisions in the Code for Design of Low Voltage Power Distribution (GB/50053); ④ For the distribution line of IT system, in case of ground fault, the insulation monitoring device shall send out audio or light signals. In case of the second phase to phase ground fault, the fault circuit shall be cut off by the over-current protection appliance or leakage current action protector; ⑤ In the lighting distribution system, the lighting and socket circuits should not be powered by the same circuit.

Qianxinan Electric Vehicle Maintenance Project

6. Safety protection function: ① The AC charging pile (bolt) shall be equipped with an emergency stop switch, which can be used to stop charging manually or by remote communication; ② The AC charging pile (bolt) shall have the leakage protection function at the output side; ③ AC charging pile (plug) shall have output side overcurrent and short circuit protection functions; ④ AC charging post (bolt) shall have flame retardant function; 7. IP protection level: AC charging pile (plug) shall comply with IP54 (outdoor), and be equipped with necessary rain proof and sun protection devices; 8. Three proofing (anti moisture, anti mildew, and anti salt fog) protection The printed circuit board, connector and other circuits in the charger shall be treated against moisture, mildew, and salt fog. The salt fog corrosion resistance shall meet the requirements in Table 9 of GB/T 4797.6-1995 Natural Environmental Conditions for Electrical and Electronic Products Dust, Sand, and Salt Fog, so that the charger can be wet Normal operation in the environment with salt fog;