Whenever people talk about electric vehicles (EV), I often hear the view that the range of electric vehicles is not long enough to drive long distances. Although Tesla and some other automakers have introduced vehicles traveling more than 200 miles, these problems do exist to a large extent. At the same time, another obstacle has greatly weakened the attractiveness of electric vehicles, namely the lack of charging stations. When charging stations are as ubiquitous as gas stations, electric vehicles can only be popularized in the market. 

It is expected that the number of electric vehicles will continue to increase in the future, with a significant increase of more than 50% worldwide. China is expected to become a leader in the growth of electric vehicles. Reports predict that electric vehicle ownership will increase from 500,000 in 2015 to 5 million in 2020. Along with this trend, charging stations and charging piles will also develop rapidly. The charging pile is similar to a charging station, which converts alternating current to direct current to charge the vehicle's batteries. The charging pile can only be converted from AC to AC, more attention is paid to diagnosis and monitoring. Thanks to new government incentives, the development of these systems has accelerated.

Let's look at some definitions of charging systems. Charging stations, also known as charging stations, charging piles and charging points for electric vehicles, are part of the infrastructure that provides electric energy for charging electric vehicles. There are three main levels when charging an electric vehicle. It is important to know these three levels before charging.

• Level I charging refers to the standard 110 VAC socket in our home. This is the basic AC to DC conversion for electric vehicles. But charging takes a long time: for example, for a 40-mile Chevrolet VOLT Volanda, it takes five to six hours. But most car owners start charging at night, then go to bed, and in the morning they can be fully charged.           
 • The second level is residential and commercial charging. For residential use, secondary AC charging stations transmit under 240VAC and 30A, similar to household washing and drying machines. This type of charging station is built for a single family: a user. In commercial applications, secondary charging not only transmits 240V and 30A, but also has intelligent network. With smart networks, owners of commercial entities can manage charging stations and see how many reports of electric vehicles being charged in charging stations and other functions are available.      
     
 • The third level is a fast DC charging station, which can charge the electric vehicle in half an hour. There is no conversion between AC and DC in the third-stage charging station. However, its current disadvantage is the lack of standards; there is no standard plug. There are two competing standards in the United States and Japan.
Although three-stage fast charging is mainly DC, there are also AC versions. Common to charging piles are less power management (conversion) and more power monitoring, diagnosis and communication, which are indispensable for commercial applications. This enables the owners of commercial places (such as office buildings or restaurants) that provide charging stations for customers to charge vehicles quickly, in order to better optimize electricity charges and charge proper charges to the owners of charging stations.            
Finally, it should be noted that these systems are considered industrial solutions. The components needed to build charging stations and charging piles are not necessarily car-grade versions. Automotive solutions require stricter qualifications, so construction is more time-consuming and expensive.