直流稳压电源.doc

摘要 本文主要论述了一种基于单片机为核心控制器的的设计原理和实现方法。该电源具有电压可预置、可步进调整、输出的电压信号和电流信号可同时显示功能。文章介绍了系统的总体设计方案，其主要由微控制器模块、稳压控制模块、电压/电流采样模块、显示模块、键盘模块、电源模块五部分构成。该系统原理是以单片机为控制单元，以数模转换芯片DAC0832输出参考电压控制电压转换模块LM3输出电压大小，同时输出稳压、恒流采用转换芯片C0832对采样的电压、电流转换为数字信号，再通过单片机闭环控制。文章最后对数控直流电源的主要性能参数进行了测定，并对其发展前景进行了展望。 关键词单片机（MCU）；数模转换器（DAC）；转换器（C）；闭环控制 Abstract The method of this paper based on the 51 microcontroller core of the numerical controller DC power supply design theory and realization. The power supply has some functions such as presetting voltage, stepping adjustment, displaying the output voltage signals and current signals at the same time. This paper introduces a general designing plan of the system, which is mainly consisted of micro-controller module, DC Regulators module, voltage/current sampling module, display module, keyboard module, power supply module. The system is based on the principle of single-chip microcomputer to control the unit STC89C52 to DAC0832 digital-to-analog converter chip reference voltage to control the output voltage LM317 output voltage conversion module size, while the output voltage regulator, current use of analog-to-digital converter ADC0832 chip sampling of voltage and current converted to digital signals, and then through the single-chip closed-loop control to achieve. Article on the main DC power supply CNC performance parameters were measured and summarized, and their development prospects. Keywords microcontroller (MCU)， the Digital to Analog (DAC)，the Analog to Digital (C)， the closed-loop control 目 录1.1 研究背景及意义1.2 国内外研究现状1.3 课题的主要内容1.4 论文的总体结构 2.1方案设计与论证 …………………………………………………………………3 2.2主控单片机(MCU) ………………………………………………………………5 2.3 液晶显示屏（1602）……………………………………………………………6 2.4 三端可调稳压器…………………………………………………………………8 2.5 运算放大器OP07 ………………………………………………………………9 2.6 数模转换芯片 …………………………………………………………………10 2.7模数转换芯片 …………………………………………………………………11 3.系统电路原理及硬件实现3.1 系统总体框图3.2 系统模块电路设计3.2.1 单片机控制模块3.2.2 稳压控制模块3.2.3 电压与电流采样模块3.2.5 电源模块3.2.6 键盘模块3.3 系统整体原理图4.系统的软件设计4.1 软件设计思路4.2 系统软件流