简易数字电压表设计报告

摘要--------------------------------------------------------2 1.数字电压表的简介------------------------------------------3

1.1数字电压表的发展--------------------------------------3

1.2数字电压表的分类--------------------------------------4

2.设计的目的------------------------------------------------5

3.设计的内容及要求------------------------------------------5

4.数字电压表的基本原理--------------------------------------5

4.1数字电压表各模块的工作原理----------------------------5

4.2数字电压表各模块的功能--------------------------------5

4.3数字电压表的工作过程----------------------------------6

5.实验器材--------------------------------------------------7

6.电路设计实施方案------------------------------------------7

6.1.实验步骤---------------------------------------------7

6.2各个模块设计------------------------------------------8

6.2.1 基准电压模块-----------------------------------8

6.2.2 3 1/2位A/D电路模块---------------------------10

6.2.3 字形译码驱动电路模块--------------------------12

6.2.4 显示电路模块----------------------------------13

6.2.5 字位驱动电路模块------------------------------16

7.总结-----------------------------------------------------17 参考文件---------------------------------------------------18 附录-------------------------------------------------------19

本文介绍了一种简易数字电压表的设计。该设计主要由五个模块组成：A/D转换模块、译码器模块、数据处理模块、驱动模块及显示模块。A/D转换主要由芯片MC14433来完成，它负责把采集到的模拟量转换为相应的数字量在传送到数据处理模块。数据处理则由芯片CD4511来完成，其负责把MC14433传送来的数字量经过一定的数据处理，产生相应的显示码送到显示模块进行显示;该系统的数字电压表电路简单，所用的元件较少，成本低，且测量精度和可靠性较高。此数字电压表可以测量0-1.999V的1路模拟直流输入电压值，并通过一个四位一体的7段数码管显示出来。

关键词:数字电压表、A/D转换、MC1403、MC14433、CD4511、MC14433、LED

Abstract

This paper introduces the design of a simple digital voltage meter. The design consists of five modules: A/D module, decoding module, data processing module, driver module and display module. A/D conversion is mainly completed by the MC14433, it is responsible to collect the analog conversion to digital quantity corresponding to the transmitted to the data processing module. Data processing is mainly completed by the CD4511 chip, which is responsible for the digital MC14433 transmission after data processing, the generated code to display the display module to display the corresponding; the system of the digital voltage meter circuit is simple, the use of fewer components, low cost, and high measuring accuracy and reliability. The digital voltmeter to measure the 1 0-1.999V DC analog input voltage value, and displayed on the 7 segment digital tube is an integration of the four.

Keywords:Digital voltage meter, A/D conversion, MC1403, MC14433, CD4511, MC14433, LED

一、数字电压表简介：

1.1数字电压表的发展

数字电压表出现在50年代初，60年代末发起来的电压测量仪表，简称DVM。它采用的是数