I. Working principle of DC charging pile and AC charging pile
The charging process of electric vehicles requires converting alternating current (AC) from an external power source into direct current (DC) stored in batteries. AC charging piles hand over this conversion process to on-board chargers, which convert external AC power into DC power for storage. The DC charging pile completes the conversion process from AC to DC inside the charging pile and directly supplies DC power to the electric vehicle battery.
Second, the advantages and applications of AC charging pilesAC charging piles (commonly known as “slow charging”) charge the batteries of electric vehicles through on-board chargers, which need to convert AC to DC during charging. This method of charging is relatively slow, but the battery loss is small.
1. Low cost: Since the converter of the AC charging pile is simple and the main power conversion is completed inside the vehicle charger, the cost of the AC charging pile is lower than that of the DC charging pile.
2. Simple installation and maintenance: AC charging pile is small in size, flexible in installation, relatively low in ground bearing capacity requirements, and easy to install and use in personal residences, commercial buildings and other places.
3. Widely applicable: almost all electric vehicles support AC charging, making AC charging piles more widely applicable.
However, AC charging piles have relatively low charging efficiency and generally take several hours to complete charging, which is more suitable for situations where the home or workplace stays for a long time.
Third, the advantages and applications of DC charging piles
The current charging pile (also known as the “fast charging pile”) directly converts AC to DC, and quickly charges the battery of the electric vehicle with high power. This way can bypass the limitations of the car charger and directly charge the battery, so the charging speed is faster.Third, the advantages and applications of DC charging piles
The current charging pile (also known as the “fast charging pile”) directly converts AC to DC, and quickly charges the battery of the electric vehicle with high power. This way can bypass the limitations of the car charger and directly charge the battery, so the charging speed is faster.1. Fast charging: The most significant advantage is the fast charging speed. For consumers who are in urgent need of fast replenishment, DC charging piles can charge the electric vehicle to about 80% within 30 minutes, greatly improving charging efficiency.
2. Efficient conversion: Since the power conversion process is completed in the charging pile, the energy transmission loss is reduced and the charging efficiency is improved.
3. High degree of intelligence: DC charging piles are generally equipped with more advanced control systems and user interfaces, which can provide more charging management and payment functions.
The main disadvantages of DC charging piles are higher cost and relatively stricter installation and maintenance requirements. Therefore, they are more installed in public charging stations and fast charging networks.