Fuzzy PID Temperature Programming Control System Based On SOPC

Solid oxide fuel cells, polycrystalline silicon solar cells and other chemical new materials, with their high performance, high added value, and high technology, make the chemical production and experimentation of catalysis and energy play an important role in national energy development. With the development of computer technology and IC technology, automatic control system in chemical industry extends the secondary instrument monitoring device to the control device with the core of chip. The level of intelligent control is increasing. A fuzzy PID temperature programming control system designed for microractor, which using SOPC technology based on FPGA, is proposed in this paper.In the area of chemical industry, the controlled object is usually microreactor, with the characteristics of time delay, time varying and nonlinear. According to the characteristics of the controlled object, Nios II software microprocessor is embedded in FPGA and SOPC technology are used for three designs, fuzzy PID IP core, temperature programming controller and control system platform. The design of fuzzy PID controller by introducing IP technology includes three elements, describing the control function by hardware language, defining parallel registers and Avalon bus interfaces. The design of fuzzy PID IP core is conducive to separation of the core algorithm with reusability. In the design of temperature programming control, the Nios II soft microprocessor is configurated, and there task functions are composed, including parameter setting, programmed temperature control and key interrupt response. On this basis, the control system platform is completed by driving input interfaces and output interfaces, the input module includes 12 bit A/D converter, keys and toggles, and the output module includes PWM IP core, RS232 serial communication. The interface design of the system platform can be used for data acquisition, temperature parameter setting, PWM output control and data communications, etc.The whole control system is completed on a chip of FPGA and the tests are successful. The tests of the step response and the programmed temperature control response of the system show that, the rising time can be controlled, the tracking is smooth, the overshoot is small, the anti-interference ability is strong, and the output is stable. All performances can meet the requirements of process control experiment.