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数字式可调直流稳压电源的设计与制作
数字式可调稳压电源的设计与制作
数字式可调直流稳压电源的设计与制作
摘 要
单片机实现的数字可调稳压电源由于原理简单、稳定性好、精度高、成本低、易实现等诸多优点而受到越来越广泛的重视。通过对数字可调稳压电源系统的设计，详细介绍了AT89C52 单片机及键盘扫描原理、数码管动态显示原理、定时中断原理,从而了解单片机相关指令在各方面的应用，同时还介绍了数模转换芯片DAC0832的工作原理。系统由辅助电源、输入键盘电路、单片机控制电路、数模转换电路、输出稳压电路、显示电路等构成，能输出5V－15V电压，步进值为0.1V和1V。本文采用单片机和其他元件及外围电路，开发一个数字式可调直流稳压电源，能够设定输出电压值，电压输出和显示。
关键词：单片机；直流稳压；数字控制； D/A转换
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数字式可调直流稳压电源的设计与制作
Abstract
Single chip implementation of digital adjustable regulated power supply because of its simple principle, good stability, high precision, low cost, easy to implement, and many other advantages by more and more widely attention. Through to the digital adjustable regulated power supply system design, detailed introduces the single-chip microcomputer AT89C52 and keyboard scanning principle, dynamic display of digital tube principle, timing interrupt principle, to understand SCM related instruction in all aspects of the application, at the same time also introduced DAC0832 d/a conversion chip works. System consists of auxiliary power supply, keyboard input circuit, single-chip microcomputer control circuit, d/a conversion circuit, output voltage regulation circuit, display circuit and so on, can output 5 V to 15 V voltage, the step value of 0.1 V and 1 V. Using microcontroller and other components and peripheral circuit, this paper developed a digital adjustable dc regulated power supply, can set the output voltage, output voltage and display.
Keywords: Single chip microcomputer; Dc voltage; Digital control; D/A conversion
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数字式可调直流稳压电源的设计与制作
目 录
1 绪论 ................................................. 1 1.1 数字可调稳压电源的背景及意义 ....................................... 1 1.2 数字式可调稳压电源的研究现状及发展趋势 ............................. 1 1.3课题研究内容 ....................................................... 3 2 方案设计 .............................................. 4 2.1设计原理 .......................................... 错误！未定义书签。 2.2 方案设计及论证 ..................................................... 4 2.2.1 方案一 ......................................................... 4 2.2.2 方案二 ......................................................... 5 2.3 方案比较选择 ....................................................... 6 2.4 主要元件介绍 ....................................................... 7 2.4.1 AT89C52 ....................................................... 7 2.4.2 DAC0832 ....................................................... 9 3 数字式可调稳压电路设计 ....................... 错误！未定义书签。 3.1系统设计 .......................................... 错误！未定义书签。 3.2 单元电路的设计 .................................................... 10 3.2.1单片机主体电路................................................. 10 3.2.2 稳压电源电路 .................................................. 11 3.2.3矩阵键盘电路................................................... 12 3.2.4 数码管显示部分电路 ............................................ 13 3.2.5 DAC0832数模转换部分电路....................................... 14 3.2.6 输出电压控制单元电路 .......................................... 15 3.2. 晶振及复位电路 ................................................ 15 4 数字式可调稳压电源软件设计 ................................ 17 4.1 系统软件流程图 .................................................... 17
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