毕业设计（论文）
题 目： 变压器温度控制器硬件系统设计
学 院： 电子信息工程学院 专业名称： 电子信息工程 班级学号： 学生姓名： 指导教师：
二O一四年 六 月
变压器温度控制系统的设计
学生姓名： 班级：
指导老师：
摘要：伴随着社会的发展，科技的进步，以弱电带强电，以单片机等微型系统处理数
据的方式在工业生产中被越来越广泛的应用。本变压器温度控制系统的设计，采用了以PIC16F690单片机为核心。本设计主要包括以下几个模块：温度采集电路，温度显示电路，超温报警电路，风机工作电路，超温跳闸电路，键盘输入电路。通过三个温度传感器对变压器的三相进行温度检测，将温度信号变成电压信号传输给PIC单片机，并通过PIC单片机内置的AD转换变成数字信号，来控制风机的工作和温度的显示；当变压器的温度超出键盘设定的风机工作温度时，会风机开关会通过风机打开，如果温度再次升高，报警电路会开始报警，当风机无法降低变压器温度，温度升高到设定的跳闸电路时，变压器将跳闸停止工作。
设计的温度显示和键扫功能通过CT1668来完成的,CT1668是一种带键盘扫描接口的LED驱动专用电路，内部集成有MCU数字接口，数据锁存器，LED高压驱动，键盘扫描等电路。
本变压器温度控制系统的设计是比较简单的弱电带强电的微型系统的设计，但是它的设计包含了许多电路系统设计的方法和步骤，对于以后复杂电路系统的设计具有重要意义。
关键词：PIC16F690，温度控制，温度显示，CT1668
指导老师签名：
Design of temperature control system
Student name: Class:
Supervisor:
Abstract: With the development of society, the progress of science and technology, the
weakness with strong, with single chip micro data processing systems and industrial production has been applied more and more widely. The design of the transformer temperature control system, the design method and the working principle of temperature control system based on PIC16F690 micro controller as the core of the. This design mainly includes the following modules: temperature acquisition circuit, the temperature display circuit, over temperature alarm circuit, fan circuit, over temperature tripping circuit, keyboard input circuit. Detecting the temperature of the three-phase three temperature sensors on the transformer, the temperature signals into voltage signals are transmitted to the PIC micro-controller, and the micro controller PIC built-in AD conversion into a digital signal, to control the fan working and temperature display; when the transformer temperature super fan working temperature keyboard setting, will the wind the switch will open the fan, if the temperature rose again, the alarm circuit can alarm, when the fan is unable to reduce the temperature of the transformer, the temperature rise to trip circuit set, the transformer will trip stop working.
The design of the temperature display and key scan function accomplished byCT1668, CT1668 is a kind of keyboard scanning interface LED drive special circuit, the internal integrated MCU digital interface, data latch, LED high voltage driver, keyboard scanning circuit.
The design of the transformer temperature control system design of micro system is relatively simple with strong power of weakness, but contains a lot of circuit system design method and the step of its design, the later is of great significance to the design of complex circuit system.
Keywords: PIC16F690, temperature control, temperature display, CT1668
Signature of Supervisor:
目录
第一章 绪论 .................................................................................................................................... 1
1.1选题的意义 .................................................................................................................................. 1 1.2 变压器的发展趋势 .................................................................................................................... 1 1.3研究内容及实验方案 ................................................................................................................. 2
第二章 PIC16F690单片机的相关说明 ............................................................................ 3
2.1 PIC单片机和MC51单片机的区别 ...................................................................................... 3 2.2 PIC16F690的简介 ...................................................................................................................... 3 2.1 PIC16F690的管脚介绍 ............................................................................................................. 4
第三章 系统组成及工作原理 .................................................................................................. 7
3.1系统工作原理 ............................................................................................................................... 7 3.2系统功能 ........................................................................................................................................ 7 3.3方案比较 ........................................................................................................................................ 7
3.3.1 MC51单片机方案的设计 ............................................................................................. 8 3.3.2 PIC16F690单片机方案的设计 .................................................................................... 8 3.3.3 两个方案的对比 .............................................................................................................. 9
第四章 硬件模块 ............................................................................................................................ 10
4.1电源模块 ...................................................................................................................................... 10 4.2温度采集模块 ............................................................................................................................. 11 4.3黑匣子模块 ................................................................................................................................. 13 4.4温度显示模块 ............................................................................................................................. 14
4.4.1 CT1668芯片介绍 .......................................................................................................... 15 4.4.2 温度显示模块的工作原理 ......................................................................................... 17 4.5 键盘输入模块............................................................................................................................ 18
4.5.1 CT1668键扫数据寄存器 ............................................................................................. 18 4.5.2键盘的功能介绍 ............................................................................................................. 19 4.6继电器模块 ................................................................................................................................. 19
第五章 系统调试及实验结果 ................................................................................................ 21
5.1模块调试 ...................................................................................................................................... 21 5.2系统调试 ...................................................................................................................................... 22 5.3 实验结果 ..................................................................................................................................... 23
第六章 总结与展望 ...................................................................................................................... 26 参考文献 ................................................................................................................................................ 27 附录 ........................................................................................................................................................... 28
一、原理图 ........................................................................................................................................ 28
二、实物图 ........................................................................................................................................ 30 三、PCB图 ....................................................................................................................................... 31
致谢 ........................................................................................................................................................... 32