With the development of the society,the autocontrol becomes more and more important.The autocontrol of the resistance furnace is highly anticipated.Microcomputer and its application has become one of the most important contents and signs in the field of High-scientific technology and new scientific technology, which plays an attractive role in every field in our national economy.As a matter of fact, Resistance Temperature Control System which is operated by microcomputer is an Intellectual Control System.In other words,it is a Temperature Control System which consumes less than others.The AT89C51 single microcomputer is adopted to control the heating process of resistance,use as a temperature transducer to turn the heating single into electing single,enlarge the electrical single,transformed through simulate numbers,then input CPU.Controllers use PID control calculation.The principle of temperature control is to adjust and heat the effective voltage of the main circuit through regulate the diversified time of transistor,therefore,it carries out the purpose of controlling the temperature.System as controlled resistance makes up an cycle control system.Control procedure of system adopts the structure of designing module,including main procedure,subsiding of suspending serves and subsidiary of control calculation etc.System adopt A.C、passes through zero etc technologies,omit traditional D/A transform components,simplify the circuit,and improve the dependability of system.Meanwhile,system also can control the real temperature of resistance at the right moment.Keywords: AT89C51; thermocouple; thyristor; PID
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