The Design Of Data Acquisition System For Energy Feedback Traction Device Based On Nios Ⅱ

With the rapid development of rail transit, the subway has become a way effective to reduce urban traffic congestion. Traction power supply device can be fed to provide electricity for subway cars, which affects directly the actual operation of the vehicle safety and stability. To achieve comprehensive monitoring of the status of their work, it is mportant to collect data by the rectifier accurate that is the core of the power supply unit. This paper is based on Beijing education commission project--Urban rail transit feedback traction supply power device. Against the Beijing subway line10, the design of data acquisition system based Nios Ⅱ embedded processor is carried out.In allusion to data requirements of feedback traction supply power device’s structure and monitoring, the defects in the original data collection based on DSP processor is analyzed. This paper designs data acquisition system hardware platform that FPGA is as platform and Nios Ⅱ processor is as the core. AD control component and real time clock RTC control components are user-defined. And so call FLASH control module, EPCS control module, Ethernet control module and the UART module are. The data acquisition system which is based on Nios Ⅱ is set up. It gives full play to the FPGA parallel processing data. The design methods of SOPC are flexible.The hardware and software is programmable. At the same time, the Nios Ⅱ processor has standard high performance and low usage of the FPGA. The factors previously mentioned enhance the overall performance of the data acquisition system.By adding hardware design files in a software development environment Nios Ⅱ system, the generation driving the bottom of each module.According to the system functional requirements, it designs the AD data acquisition applications and obtains accurate data by filtering. At the same time, the data collected are computed fundamentally and fault judged. Finally, the upper monitoring interface based on LabVIEW receives data uploaded by data acquisition system and it is displayed and stored, which realizes the real-time monitoring of the traction power supply device.