Research And Development Of Controller For X-ray Generator

Industrial CT(ICT) is computed tomography for industrial applications, and also a rapid development of high-tech in currently era. It is widely used in aerospace, aviation, casting and other fields. X-ray source system is an essential part of Industrial CT(ICT) system, it mainly consists of X-ray tube, high voltage generator, controller, power supply units, chillers, high voltage cable and other components.In exposure of X-ray machine, the capacity of X-ray tube is mainly depends on the tube voltage, tube current and exposure time, which are all controlled by the controller,so treliability of the controller has large effect to X-ray machine.The X-ray source system currently used in industrial CT is the X-ray non-destructive testing equipment used in general. X-ray source system in Market supply is generally has the hardware controller, but the function of the controller is a largely single. Which only perform simple operations such as open source, off source, set the parameter values and so on. On the other hand, the controller can only support X-ray source system, In the CT scanning process, the staff have to operate the CT system and the X-ray sourse system which is viewed as independent subsystem separately, which is inconvenient to use. This topic is for the status quo, developed a high-performance X-ray machine controller, which is not only able to efficiently control the X-ray machine, but also communicate with the industrial CT control system.This paper is based on U.S. Spellman's high voltage generator, digestion, absorption and localization of its hardware and software to develop a high-performance X-ray machine controller. The controller according to the actual needs, Proposed system solution based on SOPC,it used FPGA as the main chip, the soft core NiosII is embedded in the FPGA, the CPU, memory, I/O interface, PLL and other system modules are all integrated into the FPGA, form a programmable system on chip, complete the control of the X-ray machine. As the need of many tasks,in the design process, real-time operating system ucosI is embedded in NiosII soft-core, different functions are divided into different tasks ,so that the design greatly simplified. Firstly, according to needs of the system, carried out a systematic choice of scheme. Secondly, introduce the hardware and software design detailly, hardware design include minimum FPGA system design and peripheral circuit design, software design include custom NiosII soft-core and task of ucosII.Finally, carried out performance testing of the system.The control system based on this design is powerful. Besides the basic function of on or off the engine, the parameter setting and the information dispaly, it has more functions like important parameter monitoring, the work mode selection , fault self processing and communicate with pc and ICT. The system has been the actual tested. The test results showed that the system can meet the design requirements and the full functionality of the scheme is achieved. Which can precise control of the X-ray machine and other related functions is fulfilled. Because of the system uses the SOPC, which has a strong expansion of functions and development prospects.