Abstract
With the development of the technology of computer and control，the temperature control of electric heating furnace is becoming fully developed, the technology has been an important part of industry.
To meet the requirement of industrial control, the thesis designs a system which is constituted of temperature detecting device, A/D conversion, monolithic processor keyboard and display apparatus, alarming circuit and D/A conversion based on the control of electric heating furnace. The thesis explains the principle, the concept of design, constitution and characteristic. Because of the great developing speed of automatic temperature controlling, the thesis try to explain the system in detail, and the thesis also reflect the direction of the development of temperature controlling system.
This design controlled member is an electric heating stove, adds through the control in the resistance wire beginnings and ends voltage operating time operating time, comes the average power which outputs to the resistance wire to perform to control. Automatic temperature control of the electric furnace is realized by a temperature control circuit of solid state relay on the basis of the single-chip computer. This article put PID algorithm applies in the resistance furnace temperature control system, elaborated PID controller design, the hardware constitution and the software design, have realized set of temperatures gathering and the control design proposal. This control system has such advantages as low cost .control accuracy, good reliability and good resistance to interference.
Key words: electric heating furnace；single-chip computer；temperature control；solid state relay
