(完整版)电阻加热炉温度控制系统毕业设计

长春工业大学

毕业设计、毕业论文

题目电阻加热炉温度控制系统

学院人文信息学院

专业班级电气工程及其自动化070922班

指导教师王霆

姓名刘塞北

2011年6月3日

摘要

如今电阻炉被广泛应用于各大工业领域，通过单片机的实时控温来提高劳动生产效率和产品质量，同时对节能环保也有着重大意义。

本此设计的核心处理器为AT89C2051单片机，用其对电阻炉温度进行检测和控制。选择了K型热电偶作为金属传感器，其优点是精度高成本低，并选择串行E²PROM 24C01来存储测量数据和调控参数，这样就确保断电后数据仍能被保存。检测信号经运算放大器放大后进入多路开关，多路开关轮流检测3个通道的温度信号后轮流输出给AD转换器，最后将电压信号转变为频率信号传输给单片机进行处理。控制方式则为调功控制，通过使用光耦合双向可控硅对双向导通晶闸管的导通百分比进行控制，进而对电阻丝的功率进行调节。在键盘上输入预设温度后，单片机通过控制双向导通晶闸管的导通百分比对电阻丝的功率进行调节，使温度控制在预设值，同时在LED显示屏上显示当前炉内温度。

关键词：AT89C2051 频率转换调整

Abstract

Now resistance each industrial fields. Microcontroller is used to control temperature to improve production efficiency and product quality，and it is important to the energy conservation and environmental protection．

The design of the core processor as AT89C2051 microcontroller，with its to there sistance furnace temperature testing and control．Choose K type thermocouple as metal sensor，its advantage is low cost， and choose 24C01 E²PROM serial to storage measurement data and control parameters，thus ensure after power failure data can still be saved. Detection signal amplifier amplification by entering multiple switch after, multi-channel switch turns detection three channels temperature signal after take turns output to AD converter, finally the voltage signal into frequency signal transmission give microcontroller to undertake percentage, and the power of resistance wire adjusted. On the keyboard input preset temperature, SCM through control double guide the thyristor

conduction percentage of power of resistance wire on the adjustment, make temperature control in default, while in the LED display on display the current inside-. Identification of transfer function for control of

greenhouse air temperature[J]. J.agric.engng Res. 1995.

[19] Malvino A.P. Digital Computer. McGraw-Hill Publishing. 1977.

[20] Phil Gilard. Distributed Control. C&I[J]. 1982.

[21] Culpan. Multinational Strategic[M]. The Howorth Press. 1993.

[22] Roger EM. Diffusion of innovations. The Free Press. 1983 附录1：电阻式锅炉的自动控温系统原理图

附录2：电阻式锅炉的自动控温系统程序清单

初始化程序设计

CLEAR： CLR A

DEC A

MOV P1,A

MOV TMOD,#90H ；采样周期

MOV SP,#75H

CLR A

MOV 20H,A

MOV 21H,A

MOV 22H,A

MOV 23H,A

MOV 24H,A

MOV 25H,A

MOV 26H,A

MOV 27H,A

MOV 28H,A

MOV 29H,A

MOV SCON,#10H

MOV TMOD,#01H

VSDA EQU P1.6

VSCL EQU P1.6

SLA EQU 50H

NUMBYT EQU 51H

MTD EQU 30H

MRD EQU 40H

SLAW EQU 0A0H

SLAR EQU 0A1H

SETB EX0

SETB EA

RET

主程序入口和中断程序入口INTRY： ORG 0000H

AJMP START

ORG 0003H

RETI

ORG 000BH

RETI

ORG 0013H