数字电压表的设计

范文编号:JD677  范文字数:16785,页数:37

摘 要
本课题是利用专用芯片ICL7107设计的3 1/2数字电压表，它采用四位数码显示，能够测量-20V～+20V之间的直流电压值，而且使用的元器件数目较少。                                              ICL7107采用大电流反相输出，静态驱动共阳极LED显示器，由±5V双电源供电，显示亮度高但耗电较大，适于制作小型台式3 1/2位数字仪表。
工作过程如下：被测电压在输入电路部分经分压器（电阻）进行分衰减后，送至A/D转换器。通过A/D转换变为数字信号，输送给数字电路。然后由数字电路给LED数字信号，控制其发光，从而显示数字。

关键词：ICL7107；LED；时钟振荡器RC；双积分式A/D转换器

Abstract

This design is to makes use of the appropriate chip of ICL7107 to design a 3 1/2 arithmetic digital electric voltage form, it adopts four figureses show, can measure direct current voltage between -20V～+20V ,and the number of the chips are small. Big electric current in adoption in ICL7107 anti output mutually, the constant drives the anode LED display totally, be provided by power supply of ±5V, show that the bright degree is high but consume the electricity bigger, be suitable for the small scaled set in manufacture type 3 1/2 arithmetic figures appearance.
Work process is as follows:After the electric voltage which wanted to be measured was pressed by dividing  machine( resistance) proceeds to divide the reduces at the input of the electric circuit part ,it is sended to the A/ D conversion machine.Pass the A/ D conversion changes into the arithmetic figure signal, transporting to the arithmetic figure electric circuit.Then be given by arithmetic figure electric circuit LED arithmetic figure signal, control its give out light, from but manifestation arithmetic figure.

Key words:ICL7107;LED;The machine of clock oscillates RC;
An integral calculus type A/ D conversion machine

目  录

前言……………………………………………………………………………………1
第1章  国内外新型数字电压表概述…………………………………………………2
1.1数字电压表的主要特点…………………………………………………………  2
1.2 数字电压表的基本结构………………………………………………………… 3
1.3 直流数字电压表准确度的测试方法…………………………………………… 4
第2章  ICL7107 型单片31/2位A/D转换器…………………………………………5
2.1 ICL7107的主要特点……………………………………………………………  5
2.2 ICL7107的管脚功能……………………………………………………………  5
2.3 ICL7107的工作原理……………………………………………………………  7
    2.3.1 双积分式A/D转化器………………………………………………………7
    2.3.2 数字电路…………………………………………………………………15

第3章  由ICL7107构成的3 1/2位数字电压表的设计……………………………24
3.1 31/2位数字电压表的设计思想………………………………………………24
3.2 元器件的选择…………………………………………………………………24
3.3 由ICL7107构成的31/2位数字电压表电路设计…………………………26
3.4 使用注意事项…………………………………………………………………26
3.5 ICT7107的功能检查与调试…………………………………………………29
第4章  数字电压表印制电路板的设计……………………………………………31
结束语………………………………………………………………………………32
附录 1 ICL7107构成3 1/2数字电压表的元器件明细表…………………………33
     2 ICL7107构成3 1/2数字电压表的照片……………………………………34
参考文献……………………………………………………………………………35

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