The Design Of Multi-channel Data Acquisition System For Pantograph-catenary Arc Prototype Based On FPGA

With the continuous improvement of the rapid development of high-speed electrified railway and train speeds, and stable operation of catenary electrified railway safety is one of the important part. Catenary electrified railway safety testing has become an important part of the work safety in the high-speed rail and more and more attention. It’s necessary to develop suitable for China’s high-speed trains and high-speed detection of catenary detection equipment. Measuring actual train pantograph arcing has considerable difficulty. For which the existing pantograph arc modeling device, the design of multi-channel data acquisition system based on FPGA is expanded, and the contact pressure of the pantograph, current, voltage and light more parameters have synchronous acquisition and storage.This thesis summarized the research progress and results of the test device at home and abroad.Through acess to relevant information on principle and characteristics of the pantopraph-catenary arc,the arc characteristic were analyzed and summarized. According to the testing pantograph arcing simulation device, Altera Cyclone Ⅳ EP4CE30FPGA as the core chip hardware platforms is designed based on the analysis of the original data acquisition DSP processor speed and scalability disadvantages. Hardware system includes a converter circuit, analog signal conditioning circuits, power modules, and transmission circuits CY7C68013USB bus-based,and software system includes a FPGA control program, USB firmware and virtual instrument program. The system uses the Slave FIFO data transfer mode. Modelsim timing simulation proved that multi-channel data acquisition timing synchronization effectiveness. Also MFC-based PC program is designed to store data and data display.Finally, the system of pantograph arcing simulation device is actually measured.,using SignalTap Ⅱ logic analyzer to debug FPGA systems for testing performance of the systems, and the data is collected through actual bow network parameters USB bus transfer to the host computer software to complete the synchronization monitor display and storage of the contact pressure on the bow net, current, voltage and optical real-time. While the test results with the existing collection devices will be compared to verify the feasibility of the acquisition system design.