Design And Research On The Control System Of Three-dimensional Laser Scanning Based On FPGA

Selective laser sintering(SLS)technology is widely used because of its wide selection,simple process,fast scanning speed and high precision.But its core components of the laser scanning system has been monopolized by foreign company,there are few studies on the large-scale three-dimensional scanning system and its control program in the domestic company,which has been unable to meet the domestic 3D printing industry in various areas of application needs.This paper develops a three-dimensional laser scanning system for selective laser sintering equipment,its control system based on the PC-side drive,the Peripheral Component Interconnect(PCI)bus and the field programmable logic array(FPGA)for the control chip.Firstly,the background and significance of the 3D laser scanning system are introduced,and the design scheme of the control system is analyzed.In order to ensure that the scanning system in the complex environment conditions still maintain high-speed stable transmission of data,the system selects the PCI bus to coordinate the transmission of data.In order to efficiently implement the complex PCI bus protocol,select the dedicated PCI9052 chip design bus and adopt the linear burst data transmission mode to improve the data transmission rate.For large-capacity data transmission and drive the implementation of the strict requirements of the implementation of the system,the system uses the FPGA as the master chip,in its internal call random access memory(RAM)IP check data cache,to achieve data Real-time transmission.And analysis that the causes and effects of metastable phenomena,design ping-pong operation using two identical dual-port RAM,to avoid the generation of metastable.In order to facilitate the stable output of data,suitable for long-distance transmission and enhanced signal anti-jamming capability,the system executive use digital mirror instead of the traditional analog galvanometer.Secondly,it mainly introduces the hardware design of the control card and the design and implementation of the FPGA-based function.Firstly,the hardware circuit design introduced the overall design of the hardware,and then introduced the design of each module,including PCI bus interface circuit design,FPGA main control circuit design,output module circuit design and power circuit design and configuration circuit design,according to the principle of layout and routing to achieve PCB design and component welding.FPGA-basedfunctional design and implementation details FPGA-based design of the various control units,code implementation and the corresponding Modelsim simulation to verify the feasibility of each module design.Finally,it mainly introduces the debugging and test results of the system.First,the hardware circuit board is tested and verified.Respectively,to test the hardware clock signal,power supply module and FPGA chip is working properly;and then scan the data transmission protocol of galvanometer has been analyzed,designed,simulated and implemented;Finally,the whole system to debug,and give sufficient performance verification results to verify the feasibility of the system.