Design And Research Of Electric Vehicle Charging Pile

With the harsh situation of global warming and the increasing shortage of oil resources,the automobile industry is developing towards low-carbon electric vehicles under the influence of low-carbon concept.According to the current actual situation,every country in the world has joined into the promotion and application of electric vehicles,and increasing research in this area,which makes the development of electric vehicles comes to a white hot stage.In this trend of all-round development of electric vehicles,the corresponding set of facilities and equipment has become a part of its development.In order to vigorously develop the electric vehicle industry,we should also better develop its supporting charging equipment.Therefore,the design of electric vehicle charging pile and its control method is particularly important.The main purpose of this essay is to design and study electric vehicle charging pile and its control system based on the current development trend of electric vehicles.First of all,summarize the research status of charging pile system in China and abroad,mainly from functional requirements,facilities construction and other aspects,and the research direction was defined according to the existing research results;Secondly,the overall design scheme of the system is clarified comprehensively based on the differences between charging piles in ac and dc electricity,and the overall design scheme as well as the planning and design of software and hardware are proposed.In addition,according to the requirements of charging piles,a piece wise rapid charging strategy experiment is conducted with a single lithium battery as an example.Thirdly,combined with the above design results and the actual needs of the charging pile,defy the specific hardware situation.Based on STM32 F main control chip,AD acquisition circuit,RS232 communication and CAN communication can be completed at the same time,and also the power monitoring module,human-computer interaction module and safety protection module are designed.Fourthly,according to the combination design scheme and the specific requirements of charging pile,defy the software design of charging pile,and the best human-computer interface is defined through the combination of operating system.Finally,according to the latest international standards,the operation of the charging pile and the operation quality of each functional module were tested.It was found that in the process of charging,all the data of the whole system could met the standard requirements,and the man-machine interaction function,card swipe function and communication function could operate normally.In addition,according to the electrical protection test,during the impact current test,when the load rises to 160%KW,the impact current is 332 A and the peak current is 138% of the rated input current,both ofwhich can reach the standard.The system is still in normal operation after the surge shock.However,there is no effective test between different conductive circuits on the ground or between electrical and conductive circuits,so no breakdown result is obtained and no flicker of arc is observed.This is in line with the requirements of relevant national standards and can be used in practical operation.According to the radiation interference test results of the charging pile,no matter from which direction,the charging pile is interfered,the system can still operate in a normal state,and the measured quasi-peak value is all below 38.2db muv /m,which meets the standard requirements.According to the test results of the stop rate of the output current,the charging pile stopped the output current actively,and the output current decreased from 250 A to 2A with a stop time of 8ms and a stop rate of-30.2kv /s,which met the standard requirements that the stop rate of the output current should not be less than 100A/s.At the meantime swiping card also can show for normal,GPRS communication often also can be in normal foundation,the system runs did not show any bigger problems.In addition,it is found in the charging test that the swiping operation is normal and the overall operation effect of the system is normal.The experimental results show that the charging pile designed in this paper is safe and reliable in operation and has a good human-computer interaction interface.The charging pile developed and designed in this study has perfect functions and is easy to operate and use under the premise of high operation quality.Therefore,the research has great market potential and is of great significance to promote the development of electric vehicles.