Principle of AC charging pile
The essence of AC charging pile is a socket with control, and the output is AC power. The power is small, mostly 3.3 and 7kw.
Characteristics of AC charging piles
(1) The human-computer interaction interface adopts a large-screen LCD color touch screen, and the charging can choose constant power, fixed time, fixed amount, and automatic (until full) 4 modes; display the current charging mode, time (charged time, remaining charging time), power (charged power, to-be-charged power) and current billing information.
(2) The card reader is used for identification and recording power consumption information. The printer is used to print consumer receipts.
(3) Complete security measures.
1) Emergency stop charging button.
2) Output overcurrent protection function.
3) Output leakage protection function.
4) Automatically judge whether the charging connector and charging cable are connected correctly. When the AC charging pile is correctly connected with the electric vehicle, the charging pile can start the charging process; when the AC charging pile detects that the connection with the electric vehicle is abnormal, the charging is stopped immediately.
5) It has flame retardant function.
The difference between DC charging pile and AC charging pile
DC charging pile: DC electric vehicle charging station, commonly known as “fast charging”, it is fixedly installed outside the electric vehicle, and AC grid connection, a power supply device that can provide DC power for off-board electric vehicle power batteries. The input voltage of the DC charging pile adopts three-phase four-wire AC380V±15%, the frequency is 50Hz, and the output is adjustable direct current, which directly charges the power battery of the electric vehicle. Since the DC charging pile adopts a three-phase four-wire system for power supply, it can provide sufficient power, and the output voltage and current adjustment range is large, which can meet the requirements of fast charging.
AC charging pile: AC electric vehicle charging pile, commonly known as “slow charging”, is fixedly installed outside the electric vehicle and connected to the AC power grid, and is an on-board charger for electric vehicles (that is, fixedly installed on the electric vehicle. The charger) is a power supply device that provides AC power. The AC charging pile only provides power output and has no charging function. It needs to be connected to the on-board charger to charge the electric vehicle. It is equivalent to just playing the role of a control power supply.
The difference between the two: In simple terms, the AC charging pile needs to be charged with the help of the on-board charger, and the DC fast charging pile does not need this equipment. The charging speed of the two is quite different. It takes 8 hours for a pure electric vehicle (common battery capacity) to be fully discharged through an AC charging pile, while it only takes 2 to 3 hours to pass through a DC fast charging pile. The AC charging pile provides power input to the charger of the electric vehicle. Since the power of the on-board charger is not large, fast charging cannot be achieved.
