智能数字显示电流表的设计
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本设计将输入电流信号通过采样与处理电路处理后由 TI 公司的 AD 芯片 TLC7135 进行 AD 转换，控制核心采用 Atmel 公司的 AT89C52 单片机对转换结果 进行运算处理，驱动 4 位半 LED 显示测量结果，并通过 RS-485 通信接口发送测 量信息，上下限报警，报警输出，功能设定，实现智能数字显示电流表的功能。
Realization of the intelligent digital display current meter with good stability, high accuracy, easy reading, low cost, easy to realize the advantages ofLeabharlann Baidubeing more and more attention. Its performance is superior to the traditional pointer ammeter, having a clear and intuitive, accurate readings, extended features such as powerful, avoiding reading poor vision and visual fatigue.
Key Words: Intelligent digital display, MCU, TLC7135,AD convert,41/2 bit
II
中原工学院信息商务学院毕业论文（设计）
目录
1 概述............................................................................................................................. 1 1.1 研究的目的和意义........................................................................................... 1 1.2 发展趋势........................................................................................................... 2
毕业论文（设计）
题 目： 智能数字显示电流表的设计
系部名称： 信息工程系 专业班级： 电气 083
学生姓名：
学 号：
指导教师：
教师职称： 高级实验师
2012 年 6 月
中原工学院信息商务学院毕业论文（设计）
摘要
单片机实现的智能数字显示电流表由于稳定性好、精度高、读数方便、成本 低、易实现等诸多优点而受到越来越广泛的重视。其性能优于传统的指针电流表， 具有清晰直观、读数准确、扩展功能强等特点，避免了读数的视觉差和视觉疲劳。
In this design, the signal of input current processed through sampling and processing circuit then for AD convert by an AD chip TLC7135 for TI company .control core used Atmel company of AT89C52 single tablets machine on conversion results for operations processing drive 41/2bit LED measurement results, and through the RS - 485 communication interface send measurement information, upper alarm, alarm output, function setting, realize intelligent digital display current meter function.
通过硬件电路和单片机对 TLC7135 转换结果的处理可以实现但片机的数字 显示，量程转换，和上下限报警功能。智能数字电流表使用较为方便，适用于实 验室测量和工业控制等不同场合。
关键词：智能数字显示，单片机，TLC7135，AD 转换，四位半
I
中原工学院信息商务学院毕业论文（设计）
intelligent digital display current meter design Abstract
2 设计要求及原理......................................................................................................... 3 2.1 设计任务........................................................................................................... 3 2.2 设计原理........................................................................................................... 3
3 硬件电路的设计......................................................................................................... 5 3.1 电流信号采样电路........................................................................................... 5 3.1.1 CD4052 的原理及应用.................................................................................5 3.2 A/D 转换电路的设计....................................................................................... 7 3.2.1 TLC7135 工作原理及应用...........................................................................7 3.2.2 基准电压电路............................................................................................. 10 3.2.3 TLC7135 的时钟电路.................................................................................12 3.2.4 TLC7135 与单片机连接的接口方案.........................................................13 3.3 单片机控制部分............................................................................................. 14 3.3.1 单片机复位电路......................................................................................... 15 3.3.2 时钟电路设计............................................................................................. 16 3.3.3 485 通信接口.............................................................................................. 17 3.4 报警电路......................................................................................................... 17 3.5 显示电路设计................................................................................................. 18
Through hardware circuit and single chip processing to TLC7135 conversion result can realize current meter digital display, range conversion, and alarm function. Intelligent digital current meteris more convenient to use, suitable for the laboratory measurement and industrial control and so on.
总结................................................................................................................................. 26 致谢................................................................................................................................. 27 参考文献......................................................................................................................... 28
4 系统的程序设计及仿真........................................................................................... 20 4.1 主程序设计..................................................................................................... 20 4.2 自动量程切换子程序..................................................................................... 20 4.3 A/D 转换与中断子程序................................................................................. 21 4.4 显示子程序..................................................................................................... 24 4.5 显示部分仿真结果......................................................................................... 25
Realization of the intelligent digital display current meter with good stability, high accuracy, easy reading, low cost, easy to realize the advantages ofLeabharlann Baidubeing more and more attention. Its performance is superior to the traditional pointer ammeter, having a clear and intuitive, accurate readings, extended features such as powerful, avoiding reading poor vision and visual fatigue.
Key Words: Intelligent digital display, MCU, TLC7135,AD convert,41/2 bit
II
中原工学院信息商务学院毕业论文（设计）
目录
1 概述............................................................................................................................. 1 1.1 研究的目的和意义........................................................................................... 1 1.2 发展趋势........................................................................................................... 2
毕业论文（设计）
题 目： 智能数字显示电流表的设计
系部名称： 信息工程系 专业班级： 电气 083
学生姓名：
学 号：
指导教师：
教师职称： 高级实验师
2012 年 6 月
中原工学院信息商务学院毕业论文（设计）
摘要
单片机实现的智能数字显示电流表由于稳定性好、精度高、读数方便、成本 低、易实现等诸多优点而受到越来越广泛的重视。其性能优于传统的指针电流表， 具有清晰直观、读数准确、扩展功能强等特点，避免了读数的视觉差和视觉疲劳。
In this design, the signal of input current processed through sampling and processing circuit then for AD convert by an AD chip TLC7135 for TI company .control core used Atmel company of AT89C52 single tablets machine on conversion results for operations processing drive 41/2bit LED measurement results, and through the RS - 485 communication interface send measurement information, upper alarm, alarm output, function setting, realize intelligent digital display current meter function.
通过硬件电路和单片机对 TLC7135 转换结果的处理可以实现但片机的数字 显示，量程转换，和上下限报警功能。智能数字电流表使用较为方便，适用于实 验室测量和工业控制等不同场合。
关键词：智能数字显示，单片机，TLC7135，AD 转换，四位半
I
中原工学院信息商务学院毕业论文（设计）
intelligent digital display current meter design Abstract
2 设计要求及原理......................................................................................................... 3 2.1 设计任务........................................................................................................... 3 2.2 设计原理........................................................................................................... 3
3 硬件电路的设计......................................................................................................... 5 3.1 电流信号采样电路........................................................................................... 5 3.1.1 CD4052 的原理及应用.................................................................................5 3.2 A/D 转换电路的设计....................................................................................... 7 3.2.1 TLC7135 工作原理及应用...........................................................................7 3.2.2 基准电压电路............................................................................................. 10 3.2.3 TLC7135 的时钟电路.................................................................................12 3.2.4 TLC7135 与单片机连接的接口方案.........................................................13 3.3 单片机控制部分............................................................................................. 14 3.3.1 单片机复位电路......................................................................................... 15 3.3.2 时钟电路设计............................................................................................. 16 3.3.3 485 通信接口.............................................................................................. 17 3.4 报警电路......................................................................................................... 17 3.5 显示电路设计................................................................................................. 18
Through hardware circuit and single chip processing to TLC7135 conversion result can realize current meter digital display, range conversion, and alarm function. Intelligent digital current meteris more convenient to use, suitable for the laboratory measurement and industrial control and so on.
总结................................................................................................................................. 26 致谢................................................................................................................................. 27 参考文献......................................................................................................................... 28
4 系统的程序设计及仿真........................................................................................... 20 4.1 主程序设计..................................................................................................... 20 4.2 自动量程切换子程序..................................................................................... 20 4.3 A/D 转换与中断子程序................................................................................. 21 4.4 显示子程序..................................................................................................... 24 4.5 显示部分仿真结果......................................................................................... 25