Many people would ask: Is AC or DC better for EV charging?
This is the relatively hot topic at present. With the development of green energy and environmental protection industry, More and more countries and people choose to use electric vehicles as their daily transportation tools. So which would be better for EV charging, AC EV charger or DC EV charger?
Well, As matter of fact, It would be better to charge New energy vehicles with direct current, DC Charger is also named Fast Charging. Currently, there are also DC charging stations, It skip the on-board charger (rectifier) and directly charge the battery, and the charging time is faster. This is also one of the charging methods for electric vehicles, known as "fast charging". In fact, the AC charging station also converts the input AC power into DC power through the on-board rectifier, and then charge it into the battery. Therefore, Essentially speaking, DC power is used to charge the battery.
At present, AC charging stations are mainly used for the following reasons:
1. Personal opinion, The most important thing is the DC power DC charging station outputs is too large amount, which is hundreds of amperes. This has a significant impact on the battery life and may lead to a significant reduction for battery life. Currently, batteries are a bottleneck in the development of electric vehicles (including other devices,such as: mobile phones and electronic products). That is to say, the current battery technology itself is not very complete, and if the battery life is often shorten, it will not be economical.
2. The AC charging station is convenient and can be installed in a parking lot or charging station. The input side only needs to be connected to the power grid, and the output is also AC, No need for rectifier devices or other equipment. The structure is simple.
3. From the battery perspective, current electric vehicles are not suitable for long-distance driving, so in most cases, electric vehicles can be charged slowly during work or at home at night.
4. The power of AC charging stations is small, so the impact of electric vehicle charging on the power grid is also small. If the scale of electric vehicles is further increased in the future, then if DC high-power charging is used simultaneously, the pressure on the power grid will increase. Of course, this is also a question that must be considered in the future.
What are the AC and DC EV charging station?
AC electric vehicle charging station, commonly known as "slow charging", is a power supply device installed outside the electric vehicle and connected to the AC power grid to provide AC power for the electric vehicle on-board charger (i.e. the charger installed on the electric vehicle). The AC charging station only provides power output and does not have charging function. It needs to be connected to on-board charger to charge electric vehicles. It is equivalent to only playing a role in controlling the power supply. Charging stations are currently divided into AC charging stations and DC charging stations. The AC pile outputs single-phase/three-phase AC power, which is converted into DC power through the car charger to charge the car battery. The power is generally small (including 7kw, 22kw, 40kw, etc.), and the charging speed is generally slow. Therefore, it is generally installed in residential parking lots and other places
DC electric vehicle charging station, commonly known as "fast charging", is a power supply device that is fixed outside the electric vehicle and connected to the AC power grid. It can provide DC power for the off-board electric vehicle power battery. The input voltage of the DC charging station adopts three-phase four wire AC380V ± 15%, with a frequency of 50Hz, and the output is adjustable DC, directly charging the power battery of the electric vehicle. Due to the three-phase four wire power supply adopted by the DC charging station, it can provide sufficient power, and the output voltage and current can be adjusted in a wide range, meeting the requirements of fast charging. The DC charging station (also known as an off board charger) directly outputs DC power to charge the on board battery, with high power (60kw, 120kw, 200kw or even higher) and fast charging speed. Therefore, it is generally installed at charging stations next to highways
