数显式直流稳压电源电路设计

题 目: 数显式直流稳压电源电路设计 英文题目: Digital DC power supply circuit design

摘 要

本文主要设计并制作数字显示的直流稳压电源。本电源作为一个微型启动器，具有可调整电压，调压范围是1.25V-20V，而且具备输出电压可以显示的功能。本文介绍了直流稳压系统的总体的设计方案，它主要由变压器部分、整流滤波部分、稳压部分、电压数字显示部分和输出部分组成。电源的稳压部分用三端集成稳压管LM317完成，数字显示部分用ICL7107芯片完成。ICL7107是一种市场上应用非常广泛的集成芯片，内置程序，可以直接驱动LED数码管。本设计的显示部分是采用ICL7107芯片制作LED显示的数字电压表，并联到输出端，完成电压显示的功能。本电源具有设计简单灵活，成本低，效率高，调整精度高等优点，在市场上有很好的应用前景。

Abstract

Today's society people greatly enjoy the convenience of electronic equipment, electronic equipment, but any more than there is a common circuit - power supply circuit. Large supercomputers, small pocket

calculator, all electronic devices must be more support in the power circuit to work properly. Commonly used with AC and DC power supply of the points, of course, the power supply circuit style, complexity vary widely. Undeniable power has been widely used in all aspects of our lives, so learn and understand the power of production principles and techniques for our production and development and many have a positive meaning.

As characteristic of electronic technology, electronic circuit design equipment for the power requirement is to provide a steady, full of energy load requirements, and usually require a stable DC performance. This can provide a stable DC power supply is DC regulated power supply. DC power supply in power supply technology plays a very important position.

In this paper, design and production figures show that the DC power supply. The power supply as a mini-starter with adjustable voltage regulator range 1.25-20V, and output voltage can be displayed with the function. This article describes the display section and the output DC component. Power supply regulator part of the integrated three-terminal regulator with a LM317 completed, the digital display section complete with TCL7107 chip. TCL7107 is a very broad application on the market integrated chip, built-in program, you can directly drive LED digital tube. The design of the display part of the chip is produced using TCL7107 LED display digital voltmeter, in parallel to the output voltage display function to complete.

目 录

1 前言 ........................................................................................................................................ 1 1.1 稳压直流电源的研究背景 ................................................................................................. 1

1.2 课题的主要内容 ............................................................................... 错误！未定义书签。 1.2.1 电源的输出控制 ............................................................................ 错误！未定义书签。 1.2.2 稳压直流电源的功能 .................................................................... 错误！未定义书签。 1.2.3 性能指标 ........................................................................................ 错误！未定义书签。 1.2.4 论文的总体结构 ............................................................................ 错误！未定义书签。 2 方案的选择和设计思路 ...................................................................... 错误！未定义书签。 2.1 方案设计与论证 ............................................................................... 错误！未定义书签。 2.2 芯片的选择 ....................................................................................... 错误！未定义书签。 2.2.1 LM317三端可调节稳压器 ........................................................... 错误！未定义书签。 2.2.2 ICL7107三位半LCD/LED显示A/D转换器 ............................. 错误！未定义书签。 3 可调稳压直流电源的设计 .................................................................. 错误！未定义书签。 3.1 可调稳压直流电源的基本组成 ....................................................... 错误！未定义书签。 3.2 整流滤波电路 ................................................................................... 错误！未定义书签。 3.2.1 整流电路 ........................................................................................ 错误！未定义书签。 3.2.2 滤波电路 .......................................................................................................................... 4 3.3 稳压电路 ........................................................................................... 错误！未定义书签。 3.4 过流保护 ........................................................................................... 错误！未定义书签。 3.5 显示电路 ........................................................................................... 错误！未定义书签。 3.5.1 参数的计算 .................................................................................... 错误！未定义书签。 3.5.2 元件的选择 .................................................................................................................... 11 3.5.3 ICL7107的校准 ............................................................................................................ 12 3.5.4 ICL7107的供电电源 .................................................................................................... 12 4

稳压直流电源的测试 ......................................................................................................... 14

4.1 电源的输出显示精确度与纹波测试 ............................................................................... 14 4.2 负载能力测试 ................................................................................................................... 19 5 稳压直流电源的实物图 ...................................................................................................... 21 5.1 通电后的工作情况 ........................................................................................................... 21 5.2 电源实物图 ....................................................................................... 错误！未定义书签。

6 结语 ...................................................................................................................................... 22 6.1 结论 ................................................................................................................................... 22 6.2 体会 ................................................................................................................................... 22 致谢 ............................................................................................................ 错误！未定义书签。 参考文献 .................................................................................................................................... 23 英文摘要 .................................................................................................... 错误！未定义书签。 附录