摘要：数控电源技术是一种非常实用的工程技术，应用于各行各业。在新的时期，对数控电源的要求越来越高，本文基于Proteus仿真软件，以51单片机为控制核心电路，与外围电路相结合，设计51单片机模块，A/D转换模块，D/A转换模块，A/D转换电压检测模块，按键控制和显示模块以及电压转换模块。本文电路系统由四运算放大器作为放大输出芯片，LM317作为稳压芯片，A/D转换芯片和D/A转换芯片，键盘模块由四个独立按键组成。本文设计的直流稳压电源输入为交流220v，50Hz，输出电压连续可调，在1。26V—15V内，输出的电流最大可达1。5A，可直接显示输出电压。该系统在线路的复杂度上得到了优化，并且具有稳定的性能及直观的显示。本文介绍了数控电源的总体结构和工作原理，阐述了各个电路模块的工作原理和功能，以及通过仿真实现验证，同时也对系统软件部分进行分析以及设计实现。93099

毕业论文关键词： 51单片机，数控电源，数/模转换，稳压

Abstract: NC power supply technology is a very practical engineering technology, services in all walks of life。 The new era of NC power light amount of increasingly high demand, the article based on Proteus simulation software, with 51 microcontroller core circuit, combined with peripheral circuit, the design of 51 MCU module, analog-to-digital conversion module, D/A conversion module, A/D conversion voltage detection module, keyboard control and display module and voltage conversion module。 The article of the circuit system is made up of four operational amplifiers, the LM317 is used as the regulator chip, the A/D conversion chip and the D/A conversion chip, and the keyboard module is composed of four independent keys。 The design of DC regulated power supply for AC 22OV, 50Hz, the output voltage of 1。26V - 15V continuously adjustable, the maximum output current up to 1。5A, and can visually display the output voltage。 The system has the characteristics of simple circuit, stable performance, clear display and so on。 The whole NC power structure and its working principle are introduced, and explains the working principle and function of each circuit module, and the realization is verified by simulation, but also realize the analysis and design of system software。来自优O尔P论R文T网WWw.YoueRw.com 加QQ7520`18766

Key words: 51 single-chip, digital power supply,digital / analog conversion, regulator

目   录

1 绪论 4

    1。1 前言 4

    1。2 课题背景 4

    1。3 设计任务和目标 4

2 方案的论证与设计 5

    2。1 方案选择 5

    2。2 方案的确定 5

    2。3 方框图的设计 5

3 单元电路设计 6

    3。1 单片机电路设计 6

    3。2 按键输入电路 7

    3。3 数/模转换电路设计 8

    3。4 放大电路设计 9

    3。5 稳压电路设计 10

    3。6 模/数转换电路设计 11

    3。7 显示电路设计 12

4 软件程序设计