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技术文件

完成时间：2011.12.15

工程实践与科技创新[3A] 设计报告

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摘 要：

本实验报告是关于单片机控制DC-DC开关电源系统的设计，介绍了以单片机AVR ATmega16、脉宽调制器芯片TL494为核心器件通过控制调节输出PWM波 的方法，实现20V~30V直流电源电压输入状态下在5V~10V之内稳定的直流电源电压输出。

报告包括了DC-DC开关电源及其开环闭环控制系统的主要功能，系统的技术指标，调试分析，针对用户操作的详细说明，对双电源并联均流输出的深入扩展研究，心得体会和实物照片等等，包括了与此相关的理论和实践中的各种问题。

关键词：

DC-DC开关电源 ； 开环控制 ； 闭环控制 ； 单片机 ； 均流控制； 数模转换

ABSTRACT

This report describes the DC-DC system controlled by singlechip，including the design to control the PWM wave through the chip AVR ATmega16, chip TL494 and other circuits, so as to generate a DC power supply ranging from 5V to 10V while the input voltage ranging from 20V to 30V.

This report introduces further explanations of inner workings of the DC-DC switching power supply; including the designing and implementations of its control system and major functions. The design specifications, together with the debugging and testing process, as well as user instrustions manual are also attached.

KEYWORDS

DC-DC Convertor; Open Loop Control; Close Loop Control; MCU; Current Eqavilent; A/D converter

目 录

1. 概述 .............................................................................................................................. 1 1.1编写说明 ............................................................................................................... 1 1.2名词定义 ............................................................................................................... 1 1.3硬件开发环境 ....................................................................................................... 1 1.4软件开发环境 ....................................................................................................... 2 1.5缩略语 ................................................................................................................... 2 2. 系统总述 ...................................................................................................................... 3 2.1系统组成 ............................................................................................................... 3 2.1.1DC-DC开关稳压电源模块 ............................................................................ 3 2.1.2单片机小系统 ................................................................................................ 4 2.1.3电压控制模块 ................................................................................................ 5 2.1.4电压检测模块 ................................................................................................ 5 2.1.5双电源并联输出模块 .................................................................................... 5 2.2系统的主要功能 ................................................................................................... 6 2.2.1DC-DC开关电源稳压电源模块 .................................................................... 6 2.2.2单片机小系统 ................................................................................................ 6 2.2.3电压控制模块 ................................................................................................ 6 2.2.4电压检测模块 ................................................................................................ 6 2.2.5双电源模块并联输出系统 ............................................................................ 6 3. DC-DC开关稳压电源模块的设计 ............................................................................ 7 3.1主要功能和设计指标 ........................................................................................... 7 3.1.1主要功能 ........................................................................................................ 7 3.1.2系统设计指标 ................................................................................................ 7 3.2基本设计原理 ....................................................................................................... 7

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上海交通大学 电子信息与电气工程学院