Fpga-Based Achievement Of Functions Usually Used In Analytical Instruments

With the development of technology and society, analytical instruments’application takes lots of advantages to the product of industry and people’s daily life. It has been a necessary instrument to the product of industry, science research and people’s daily life, there is a beautiful future to the analytical instrument development. As the development of analytical instrument, the requirement of flow control, real time control and parallel control becomes more and more rigorous. We usually use the analog control at simple control applications; analog control circuit has fewer devices and run stably. But there are some disadvantages to the analog control, it is not convenient to adjust parameters, and the control result is usually affected by the environment, and the control precision is low. So we usually take place the analog control with the digital control at the occasion that the control object is changeful. Compared with the analog controller, the traditional digital controller, such as MCU, DSP and so on, can be easily adjusted, we can change the control strategy expediently, and the control precision is high, and the control result is not so sensitive to the environment’s change. To replace the analog controller with the digital controller, there is a big significant action to increase the controller’s precision and stability.Traditional digital controllers realize control functions through executing program sentences one bye one, or through executing multi-task process based on operating system, the function is realized by serial program sentences. The characteristic of serial processing will cause a bad result on the real time requirement toward multi-task processing. The characteristic of software causes the bad result on stability and universality. If we use FPGAs (Field Programmable Gate Array) as the controller, replacing traditional digital controller, we can not only maintain the characteristic of flexible configuration on digital controller, but also meet the requirement of parallel running, real time, universality and stability on software. And FPGAs process logic sentences much faster, can endure higher EMC, the program design is flexible and easy, the application of FPGAs on industrial field can take big significant effects to analytical instrument’s stability and reliability. The technology of FPGAs’develop much faster, there are more and more resolving projects to meet the control requirement of real time and parallel processes. The research and achievement of analytical instrument’s usually used functions based on FPGA is a significant activity.The object of this paper is realizing analytical instrument s’usually used functions based on FPGA, I take FPGA as the control unit, study and analysis the classical control theories, design the rotate speed and temperature control board based on FPGA, and realize it, at last validate the FPGAs’control function. I carry on the follow researches on this paper, at the first section I tell the background and significance of the paper mainly. At the second section I tell the classic control theories, mainly tell the theories of PID, then tell of the advanced PID control models, and simulate the PID models with Matlab. At the third section Ⅰ tell of the designed FPGA control system’s project about the hardware circuit, mainly tell of BLDC’s speed control block and TEC’s temperature control block, tell of the working theory, drive projects about hardware, the control arithmetic and other blocks on the system. At the forth section Ⅰ tell of the FPGA control system’s program contents. At the beginning Ⅰ designed the program’s framework based on the requirement of blocks. Then I carry on the particular design, realize the blocks’ function requirement based on Verilog. At the last Ⅰ simulate the designed programs with Modelsim software, and validate the bolcks’ designed functions. At the fifth section Ⅰ test the system’s functions, and analyze the test results. At the sixth section Ⅰ summarize the paper, and put forward the expectation about the research’s disadvantage in the future.Through the design of analytical instruments’ control system based on FPGA of this paper, I know well analytical instruments’ control functions and control theories, put forward the control methods based on FPGA, design the control system’s hardware circuit, design programs based on Verilog, at last download programs to the FPGA board, and validate the control functions designed. The research carried on at the paper wealthy validate the requirements and feasibility about the achievement of analytical instrument’s usually used functions based on FPGA, powerfully promote the analytical instruments’ development and elevation about the control performance.