数控直流电压源的电路设计实现

论文总字数：29805字

摘 要

本文以STC89C52RC高档8位单片机为核心处理器，用来控制电压输出，输出电压范围为0—9.9V。本文开始先比较了几种方案，从中确定出满足设计要求的方案。然后对设计的软硬件进行了详细介绍，论述了在数控直流电压源中，通过两个按键控制电压步进增减，设置步进电压等级0.1V。单片机将数字信号送到DAC0832，经过运放OP-07转换成模拟信号，然后由运算放大器LF356进行电压放大，最后经三极管TIP122和三极管TIP127组成的功率放大电路以放大电流，得到输出电压。STC89C52RC主要是控制输出电压，信号处理，以及输出电压显示在LCD1602液晶屏上。最后分析了设计中第一次测量产生较大误差的原因，并对本次设计的不足进行了阐述。

关键词：数字控制；电源；步进；功放 ；误差

The Circuit Design of Digital Control DC Voltage Source

Abstract

In this paper, high-grade 8 bit MCU STC89C52RC as the core processor , controlling the output voltage . And the output voltage range is 0 - 9.9V. First of all, this article compares several schemes , one of which was selected that meets the requirements of the design. Then, hardware design and software design are introduced at length. By the two keys to control the voltage step increase or decrease and set the step voltage grade 0.1V in the circuit design of digital control DC voltage source. In the beginning, Single chip sent digital signal to the DAC0832, then convert to the analog signal by the operational amplifier OP-07 .Next through the operational amplifier LF356 and two triode TIP122 and TIP127 to form a closed loop of push-pull power amplifier output circuit. Last , obtaining the output voltage. STC89C52RC is mainly to control the output voltage, signal processing, and the output voltage is displayed on the 1602 LCD screen. At last,analysising the causes which lead to some errors from the first measurement in the design and describing the shortcomings of this design.

Keywords: Digital control ；Power Supply；Step; Power amplifier; Error

目 录

摘 要...............................................................................I

Abstract..............................................................................II

第一章 引 言........................................................................1

1.1 数控直流电压源的电路设计背景...................................................1

1.2 电子线路设计概述及理应解决的主要问题...........................................1

1.3 电路设计的指导思想、采用相关理论与方法.........................................1

1.4 直流稳压电源国内外发展现状及存在的问题.........................................2

1.5 设计目的及意义.................................................................3

1.6 论文结构.......................................................................3

第二章 方案设计、比较与论证............................................................4

2.1 方案设计.......................................................................4

2.2 方案比较与论证.................................................................5

第三章 系统硬件电路设计................................................................6

3.1 电源模块.......................................................................6

3.1.1 -15V电源（0.6A）.......................................................7

3.1.2 5V电源（1A）...........................................................7

3.2 数控模块.......................................................................7

3.2.1 主控单片机STC89C52RC....................................................8

3.2.2 液晶显示屏LCD1602.......................................................8

3.3 稳压输出模块..................................................................11

3.3.1 数/模转换器DAC0832.....................................................11

3.3.2 运算放大器OP07.........................................................13

3.3.3 运算放大器LF356........................................................13

3.3.4 电路的工作原理.........................................................14

第四章 系统软件电路设计...............................................................16

4.1 主程序流程图..................................................................16

4.2 电压步进增减流程图............................................................16

4.3 主控程序设计思路..............................................................17

第五章 系统测试结果及结果分析.........................................................19

5.1 测试仪器......................................................................19

5.2 测试方法......................................................................19

5.3 测试结果......................................................................19

5.4 结果分析......................................................................19

第六章 结束语.........................................................................21

致 谢..............................................................................22

参考文献（References）................................................................23

附 录..............................................................................24

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