This paper briefly introduces the content and research status of AC charging piles for electric vehicles. A control system solution based on STM32F107VCT6 microcontroller is designed, and the software and hardware design of the control system and the electrical part design of the pile are introduced in detail. The system provides a variety of functions including human-computer interaction, charging control, energy metering, IC card payment, ticket printing, operation status monitoring, charging protection and charging information storage and uploading to meet the requirements of the charging process.
With the deepening of the global energy crisis, the depletion of petroleum resources, and the increasing harm of air pollution and global temperature rise, governments and automobile companies generally recognize that energy conservation and emission reduction are the future direction of automotive technology development. The development of electric vehicles will be The best way to solve these two problems. China attaches great importance to the development of electric vehicles, and the state has successively issued a series of standards to support and standardize the development of electric vehicles. However, there is still a long way to go to realize the large-scale popularization of electric vehicles in China. There are still many problems to be solved. In the recently released draft of the "Energy Conservation and New Energy Vehicle Industry Plan", it is pointed out that pure electric vehicles will be the main strategic orientation. Experts pointed out that there are three major bottlenecks in the development of pure electric vehicles: one is the lack of standards, the other is imperfect supporting policies, and the third is the orderly advancement of infrastructure planning and construction. The electric vehicle AC charging pile studied in this paper is of great significance for promoting the popularization of electric vehicles as part of the charging infrastructure.
1 Introduction to electric vehicle AC charging pileAC charging piles, also known as AC power supply units, are fixed on the ground or walls, installed in public buildings (office buildings, shopping malls, public parking lots, etc.) and residential community parking lots or charging stations. The electric vehicle provides a human-machine interaction interface and an AC charging interface, and has a dedicated device for corresponding measurement and control protection functions. The AC charging pile adopts a large-screen LCD color touch screen as a human-computer interaction interface, and can select four modes of charging, constant time, fixed amount, and automatic (full), with running status monitoring, fault condition monitoring, charging time-sharing, Historical data recording and storage functions. The AC working voltage (220±15%)V of the charging pile and the rated output current (AC) are 32 A (seven-core socket). It takes about 6-8 hours for the AC charging pile of ordinary pure electric car to be fully charged. The charging pile is more suitable. Charge at slow speed. The AC charging pile is generally composed of a pile body, an electrical module, a metering module, and a account management module. Depending on the installation method, the pile can be divided into two types: floor type and wall type. Floor-standing charging piles are suitable for ground installation in various parking lots and on-street parking spaces; wall-mounted charging piles are suitable for wall mounting in fixed buildings such as crowded spaces and surrounding walls, such as underground parking lots or garages.
2 AC charging pile system working principleAccording to the requirements of GB/T 20234.2-2011 "Connecting device for conductive charging of electric vehicles; AC charging interface", the method of controlling the guiding circuit is used as the judging device for the connection state and rated current parameter of the charging connection device. . Its typical control and guiding circuit is shown in Figure 1.
After the power supply device plug is connected to the socket, the power supply control device determines whether the power supply plug and the power supply socket are completely connected by the voltage value of the detection point 4 shown in FIG. At the same time, the electric vehicle control device determines whether the vehicle plug and the vehicle socket are completely connected by measuring the resistance value between the detection point 3 and the PE. After the connection state detection of the plug and the socket is completed, the operator completes the charging start setting of the power supply device, and the switch S1 is switched from the connection +12 V state to the PWM connection state, and the power supply control device issues a PWM signal. The power supply control device determines whether the charging connection device is fully connected by measuring the voltage value of the detection point 1. After the vehicle control terminal detects the error, the S2 is closed. The power supply control device determines whether the vehicle is ready by measuring the voltage value of the detection point 1 again. If the requirement is met, the AC power supply circuit is turned on by closing K.
Nd Yag Rod is a purple laser crystal, which are widely used for laser cutting, medical instrument @1064nm. It is suitable for a variety of laser working modes (continuous, Pulse, q-switch, mode locking, frequency doubling, etc.), widely used in industry, medical treatment, military and scientific research fields. Our company can provide large-size and high-quality nd:yag crystal rods, crystal slabs and crystal discs for high-power and ultra-high-power lasers in a variety of specifications.
Nd Yag Rod,1064nm Yag Laser Crystal,Nd Yag Laser Crystal,Laser Welding Laser Crystal Rod
Zoolied Inc. , https://www.zoolied.com