Research and discussion on high current charging technology for new energy vehicles
With the development of China's economy and the improvement of people's living standards, automobiles have become the main means of transportation for people to travel. With the increase in the number of automobiles year by year, problems such as environmental pollution and an energy crisis have been caused, and new energy electric vehicles can effectively solve the problem. Traditional vehicles pollute the environment and alleviate the depletion of primary energy. New energy electric vehicles use special charging equipment to charge the battery in the car.
During the driving process, the battery in the car provides energy, and the battery obtains electricity mainly through Charging facilities. This paper mainly analyzes the charging piles and onboard chargers in the charging facilities and their topology circuit structures and control methods, which are important for achieving high efficiency, high power density, good reliability, and extending the service life of the battery. Significance. Firstly, the DC charging pile is analyzed. At present, most of the internal rectifier structures of DC charging piles at home and abroad use three-phase voltage rectifiers. The PI control method has problems such as the inability to realize the static control of the current and the poor anti-interference ability. The quasi-proportional resonant SVPWM control method is proposed, and the simulation results show that the control method realizes the tracking of the input current to the command current without static error, and has the good anti-interference ability;
Electric vehicle charging has always been an important link in the development of the industry, and safety issues during the charging process are very important. In order to improve the safety of the charging plug, this project develops a plug with overload protection. When the current is too large during the charging process, The plug can automatically cut off the power supply, stop charging and alarm.
This project is based on a comprehensive analysis of the shortcomings of temperature control and suppression in the current high-current charging process of automobiles, as well as the adverse consequences that will be caused, and proposes corresponding solutions. The main research and development purpose of this project is to provide a high-current charging temperature control technology for electric vehicles to meet the needs of the market.
1) The pulse signal wave generated by the key touch working principle of the membrane switch element in the low voltage and the current state is used to send the command control and control signal to the motor control system through the cable connector, and the control of the motor work is realized. An indirect, safe, convenient and fast efficient solution;
2) The data line made of new materials is used to carry the signal transmission, and the block copolymer containing aromatic polyester hard segment and fatty acid or polyether under-segment is used as the material of the signal line so that the signal line has good elasticity and durability. Grinding, excellent flexural resistance, excellent heat resistance, and the service life can be extended by 5 years compared with the old material;
3) Use the characteristics of electronic components and cable connector assembly to achieve innovation in new functions, and realize the control of components on the motor. This technology can fill the gap in the development of such products in the domestic cable industry and improve the performance of cable connector components. The added value of processing.