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Analysis of the difference between DC charging pile and AC charging pile

Date:2019-09-16 10:52:03   Popularity:

Analysis of the difference between DC charging pile and AC charging pile 

New energy vehicles are now developing rapidly with the support of the state and the government. There are more and more people buying new energy vehicles. As an important infrastructure for new energy vehicles, charging piles are also developing rapidly. Currently, China's charging infrastructure is public. The number of charging facilities is the highest in the world. But, do you know what a charging pile is? A charging pile is actually an electric vehicle charging station that charges a car or bus. At present, there are two types of charging piles commonly available on the market, one is a DC charging pile, and the other is an AC charging pile.

So how do AC charging piles and DC charging piles differ? There are three ways to connect cars and charging piles:

One is to use a power cable and plug connected to the electric vehicle when connecting the electric vehicle to the grid.

The second is to use a separate active cable with an electric vehicle connector and power connector

The third is to use power cables and connectors that are connected to the AC grid.

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 provides an AC power supply device for the electric vehicle vehicle charger (ie, the charger fixedly mounted on the electric vehicle). The AC charging post only provides power output. There is no charging function. You need to connect the car charger to charge the electric car. It is equivalent to just playing a role in controlling the power supply.

The input and output of the AC charging pile are all AC. The general interface has 7 lines. The seven lines are:

L, N: two lines of AC power

PE: Ground wire, in the charging connection process, first turn on the protective ground contact, and finally turn on the confirmation contact and the charging connection confirmation head; and in the process of disconnection, first disconnect the control confirmation connector and the charging connection confirmation connector Finally disconnected the ground wire

CC: Charging connection confirmation

CP: Control confirmation

NC1, NC2: spare contacts

 

The AC charging pile is generally smaller than the DC charging pile because its charging speed is slower than DC. That is to say, the AC charging pile only provides the power output function. In fact, there is no charging function. When connecting, it is charged with the vehicle. The machine charges the car. In other words, it needs to be charged by the car charger, so its power is generally not very large, generally 3.5KW, 7KW, 15KW and so on.

2, DC charging pile

 

DC electric vehicle charging station, commonly known as "fast charging", is a power supply device that is fixedly installed outside the electric vehicle and connected to the AC power grid to provide DC power for the non-vehicle electric vehicle power battery. The input voltage of the DC charging pile adopts three-phase four-wire AC380V±15%, the frequency is 50Hz, and the output is adjustable DC power, which directly charges the power battery of the electric vehicle. Since the DC charging pile is powered by a three-phase four-wire system, it can provide sufficient power, and the output voltage and current adjustment range is large, which can achieve the requirement of fast charging.

 

The DC charging post contains 9 heels, which are:

DC+, DC-: DC power supply positive and negative

PE: Protected area

S+, S-: CAN communication, communication between off-board charger and electric vehicle

CC1, CC2: Charging confirmation

A+, A-: auxiliary source positive and negative 

Due to the large output power of DC charging piles, the general specifications are 30KW, 60KW, 80KW, 120KW, 150KW, 180KW, etc.

 

Simply put, the AC charging pile needs to be charged by means of a car charger, which is not required for DC fast charging piles. The difference in charging speed between the two is large. It takes 8 hours to fully charge a pure electric vehicle (common battery capacity) through the AC charging pile, and only 2 to 3 hours through the DC fast charging pile. The AC charging pile provides power input to the electric vehicle's charger. Since the power of the in-vehicle charger is not large, fast charging cannot be achieved.

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