In order to promote the development of China's electric vehicle industry and improve the level of environmental protection, China has built a total of 2,350 power stations and 220,000 charging piles during the 12th Five-Year Plan period, covering the entire country. However, due to the late introduction of the standard for electric vehicle charging piles, there are significant differences in the specifications and quality of different charging piles, and the intelligent charging piles of electric vehicles often operate in harsh natural environments and strong electromagnetic environments. Therefore, how to effectively protect the stability and work efficiency of the charging system has become an important issue that plagues the development of the electric vehicle industry.
First, the overall design requirements of smart charging piles
China has a vast territory, spans multiple temperature zones, and the natural environment is more complicated. In addition, the charging piles often work in a strong electromagnetic environment, which puts higher requirements on the design of electric charging piles for electric vehicles.
1.1 can withstand the test of many extreme weather
As the global climate continues to warm, the probability of extreme natural weather events is increasing, causing serious impacts on various industries in society. For smart charging piles, the external structure must have good sealing, so that water drops, rain and snow, etc. can not enter the pile, thus avoiding short circuit or system failure; the internal air flow needs to be formed, so that it can be distributed in time. The heat generated by the components.
1.2 should have strong anti-electromagnetic interference capability
The electromagnetic environment is mainly caused by signal transmission interference caused by various electromagnetic inductions. In the rapid development of wireless mobile communication technology, electromagnetic interference has become one of the more common phenomena. For the working environment with strong electromagnetic interference, when designing the intelligent charging pile for electric vehicles, it is necessary to seriously consider the electrical layout, thereby reducing the adverse effects caused by various electromagnetic interferences and ensuring that the intelligent charging piles of electric vehicles can operate normally.
Second, the design and implementation of intelligent charging pile
2.1 External overall structure and total control unit device
The intelligent charging pile of electric vehicle adopts the cross-covering process design. The strength of the whole pile structure meets the requirements of IP65 protection level, which can effectively prevent the infiltration of water. In the design of the main body, the intelligent charging pile of electric vehicle adopts galvanized steel plate as the system hardware material. In order to ensure that it can operate normally in humid, salt, fog and other environments, a car paint process is applied, and a protective paint film is applied on the surface; in terms of component selection, considering the temperature difference between different regions, The STM32F107VCT6 microcontroller from STMicroelectronics includes a high-performance ARMCortex-M332-bit RISC core (operating at 72MHz), an Ethernet interface, six serial ports connected to each control unit, and 16 IO interfaces. Initially meet the needs of use and monitoring work. In addition, the device can work normally in the industrial temperature range, greatly improving the operating efficiency of the master control unit.
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