摘要本文主要内容是以实验室平板导热仪实验装置中主加热板和防护板间的温差控制为研究对象，在掌握平板导热仪实验装置的工作原理基础上，基于单片机设计实现装置中多路温度信号的采集以及主加热板和防护板间的温差控制，以保证通过平板的传热为一维稳态导热。通过PN结补偿法测量环境温度，对热电偶冷端的补偿，运用HCNR200将电动势信号调整放大同时隔离，以满足AD转换的电压值，用STC12C5A60S2增强型8051 CPU进行AD采集，以及PWM对信号的控制使其恒定。之后采用INA333运算放大器进行数模的转换、运放及滤波得到合适的信号，采用LM2576通过输入和输出可调节加热电源，对主加热板和防护加热板进行控制，使主加热板和防护加热板之间的信号保持稳定。熟悉并掌握智能仪表设计方面的基本研究、分析方法。63658

毕业论文关键词：平板导热仪、PN结温度补偿、OPA333、增强型8051单片机、INA333、LM2576 

毕业设计说明书（论文）外文摘要

Title：Tablet thermal analyzer controller design and research

Abstract

The main contents are laboratory conductivity meter flat in the main experimental apparatus and protective plate heating plate temperature difference between the control for the study, in mastering tablet thermal conductivity tester experimental device works based on the design and implementation based on single chip multi-channel temperature signal devices collection and the main heating plate and protective plate between the temperature control to ensure that the heat transfer through the flat one-dimensional steady-state heat conduction. Compensation via PN junction temperature measurement of the thermocouple cold junction compensation, the use of the electromotive force signal to adjust amplification HCNR200 same isolation to meet the voltage of the AD conversion value of a 8051 CPU STC12C5A60S2 enhanced the AD acquisition, and a PWM control signal it is constant. After using the operational amplifier INA333 digital-analog conversion, the op amp and filter to obtain the appropriate signal, via the input and output using LM2576 adjustable heating power of the heating plate and protective heating main control board, the main heating plate heating plate and protective signals between stable. Familiar with and master the basic design of the smart meter research, analytical methods.

Keyword:  Tablet thermal conductivity tester, Tablet thermal conductivity tester, PN junction temperature compensation, OPA333, enhanced 8051 microcontroller,INA333,LM2576

目   次

1 绪论 1

1.1 引言 1

1.2 国内外的导热仪的现状 1

2 平板导热仪的测量原理 1

2.1 傅立叶导热定律 1

2.2 一维稳态导热的分析 1

3 平板导热仪控制器的设计 1

3.1 采集模块 1

3.1.1 热电偶 1

3.1.1.1 PN结温度补偿 1

3.1.2 运放及滤波 1

3.1.2.1 INA333运算放大器 1

3.1.2.2 OPA333运算放大器 1

3.1.2.3 HCNR201光电耦合器 1

3.2单片机STC12C5A60S2 1

3.2.1简介 1

3.2.2模数转换 1

3.2.3 PWM输出 1