With the rapid development of the EV market, DC charging piles have become an integral part of the EV charging infrastructure because of their own characteristics, and the importance of DC charging stations has become increasingly prominent. Compared to AC charging piles, DC charging piles are able to provide DC power directly to EV batteries, significantly reducing charging time and typically charging up to 80 per cent in less than 30 minutes. This efficient charging method makes it more widely used than AC charging piles in places such as public charging stations, commercial centres and highway service areas.
In terms of technical principle, DC charging pile mainly realises the conversion of electric energy through high-frequency switching power supply and power module. Its internal structure includes rectifier, filter and control system to ensure the stability and safety of output current. Meanwhile, the intelligent features of DC charging piles are gradually enhanced, and many products are equipped with communication interfaces that enable real-time data interaction with EVs and power grids to optimise the charging process and energy consumption management. Its technical principle profile mainly includes the following aspects:
1. Rectification process: DC charging piles have built-in rectifiers to achieve charging by converting AC power to DC power. This process involves the collaborative work of multiple diodes to convert the positive and negative half-weeks of AC to DC.
2. Filtering and Voltage Regulation: The converted DC power is smoothed by a filter to eliminate current fluctuations and ensure the stability of the output current. In addition, the voltage regulator will regulate the voltage to ensure that the voltage always stays within the safe range during the charging process.
3. Intelligent control system: Modern DC charging piles are equipped with an intelligent control system that monitors the charging status in real time and dynamically adjusts the charging current and voltage to optimise charging efficiency and protect the battery to the maximum extent.
4. Communication protocols: The communication between DC chargers and EVs is usually based on standardised protocols such as IEC 61850 and ISO 15118, which allow for the exchange of information between the charger and the vehicle, ensuring the safety and efficiency of the charging process.
Regarding charging post product standards, DC charging posts follow a number of international and national standards to ensure safety and compatibility. The IEC 61851 standard issued by the International Electrotechnical Commission (IEC) provides guidance on the connection between EVs and charging facilities, covering electrical interfaces and communication protocols. China’s GB/T 20234 standard, on the other hand, details the technical requirements and safety specifications for charging piles. All of these standards regulate the standards of the charging pile manufacturing and design industry to a certain extent, and to a certain extent, help to promote the healthy development of the market for new energy electric vehicles and their supporting industries.
In terms of the type of charging guns of DC charging pile, DC charging pile can be divided into single-gun, double-gun and multi-gun charging pile. Single-gun charging piles are suitable for small charging stations, while dual-gun and multi-gun charging piles are suitable for larger premises to meet higher charging demand. Multi-gun charging posts are particularly popular because they can serve multiple EVs at the same time, dramatically increasing charging efficiency.
Finally, there is the outlook for the charging pile market: the future of DC charging piles is sure to be full of potential as technology advances and market demand grows. The combination of smart grids, driverless cars and renewable energy will bring unprecedented new opportunities for DC charging piles. Through the further development of the green era, we believe that DC charging piles will not only provide users with a more convenient charging experience, but will also ultimately contribute to the sustainable development of the entire e-mobility ecosystem.
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Post time: Sep-20-2024
