DCDC开关电源及控制系统

关键词：开关电源，闭环控制，自动拟合，有源低通滤波器， 模数转换 ABSTRACT
This Paper particularly presents the design of each module of voltage-decrease switch mode DC-DC convertor with its control and feedback circuits. It is devided into three parts which are called DC-DC convertor, outer voltage system controlled by single chip, outer voltage controlled by closed loop. These three parts explain the principle of the realization. It has an input voltage of 20~30V and an output of 5~10V, while the errors of the opened-loop and closed-loop control are both restricted within ±0.05V. This type of power supply uses TL494 as its core element. The MCS dominates the connection and disconnection of the switch audion through the output of PWM signal, in order to control the output voltage. Moreover, the ADC converts the output signal and feed back to MCS, which can then analyse and deal with it.
技术文件
完成时间：2008-12-16
科技创新 [5] 设计报告
项目名称：DC-DC 开关电源及其控制系统 设计小组编号： 202 设计小组名单：楚小雨(组长)、陈博、曹子仲
电子系
上海交通大学 电子信 息与电气工程学院
姓名
楚小雨 陈博 曹子仲
班级
F0603032 F0603032 F0603032
DC—DC 变换、单片机控制输出电压、单片机闭环参与控制 DC—DC 的输出，三个阶段说明此变换 器的实现原理。可实现 20~30V 输入 5~10V 输出，开/闭环控制误差范围均在±0.05V 以内。 该系统以 TL494 为核心，单片机通过输出 PWM 信号控制开关三极管的通断，从而达到控制输 出电压的目的，而 ADC 则对输出信号进行转换并反馈给单片机分析处理，形成闭环系统。
4.3.2 基准电源模块................................................................................................. 14 4.3.3 整型模块......................................................................................................... 15 4.3.4 有源低通滤波模块.........................................................................................15 4.3.5 信号隔离变换模块.........................................................................................16 4.4 实物图.......................................................................................................................16 5. 电压测量子系统的硬件设计.........................................................................................18 5.1 主要功能与设计指标............................................................................................. 18 5.1.1 主要功能......................................................................................................... 18 5.1.2 设计指标......................................................................................................... 18 5.2 基本设计原理.......................................................................................................... 18 5.3 主要电路和参数设计............................................................................................. 18 5.3.1 元件参数列表................................................................................................. 18 5.3.2 核心芯片 ADC0804 介绍..............................................................................19 5.3.3 元件参数设计................................................................................................. 20 5.4 实物图.......................................................................................................................20 6. 单片机子系统及软件设计.............................................................................................22 6.1 单片机子系统硬件介绍......................................................................................... 22 6.1.1 主要功能......................................................................................................... 22 6.1.2 实验相关元件................................................................................................. 22 6.2 软件设计.................................................................................................................. 24 6.2.1 软件总体结构和功能.................................................................................... 24 6.2.2 重要的全局变量列表（以字母序排列）...................................................25 6.2.3 流程逻辑......................................................................................................... 25 6.2.4 PWM 信号发生模块描述.............................................................................28 6.2.5 开环控制模块描述.........................................................................................30 6.2.6 开环控制自动拟合模块描述........................................................................31 6.2.7 闭环控制模块描述.........................................................................................32 7. 致谢...................................................................................................................................35 8. 参考文献.......................................................................................................................... 36 第 2页 上海交通大学 电子信息与电气工程学院
KEYWORDS
Switch Mode Power Supply, Closed-Loop Control, Automatic Fit, Liquid Pressure Filter ，ADC
上海交通大学 电子信息与电气工程学院 地 邮 址：东川路 800 号 编：200240
目
录
1. 概述.....................................................................................................................................1 1.1 编写说明.....................................................................................................................1 1.2 名词定义.....................................................................................................................1 1.3 缩略语.........................................................................................................................1 DC-DC： Direct-Current-Direct-Current...................................................................... 1 即直流－直流转换器。将直流输入信号转换为需要输出大小的直流信号。...... 1 2. 系统总述............................................................................................................................ 3 2.1 系统组成.....................................................................................................................3 2.1.1 开关电源子系统...............................................................................................3 2.1.2 电压控制子系统...............................................................................................4 2.1.3 电压测量子系统...............................................................................................4 2.1.4 单片机子系统................................................................................................... 4 2.2 系统的主要功能........................................................................................................5 3. DC-DC 开关电源子系统的硬件设计............................................................................ 6 3.1 降压型 DC-DC 开关电源子系统............................................................................ 6 3.1.1 主要功能与设计指标.......................................................................................6 3.1.2 基本设计原理................................................................................................... 6 3.1.3 主要电路和参数设计.......................................................................................7 3.1.4 典型问题分析................................................................................................. 11 3.1.5 实物图..............................................................................................................12 4. 电压控制子系统的硬件设计.........................................................................................13 4.1 主要功能与设计指标............................................................................................. 13 4.1.1 主要功能......................................................................................................... 13 4.1.2 设计指标......................................................................................................... 13 4.2 基本设计原理.......................................................................................................... 13 4.3 主要电路和参数设计............................................................................................. 14 4.3.1 元件参数列表................................................................................................. 14 第 1页 上海交通大学 电子信息与电气工程学院
ቤተ መጻሕፍቲ ባይዱ学号
5060309001 5060309086 5060309056
具体负责的工作 硬件设计，调试 软件编程，调试 硬件制作，调试
联系方式 13916916707 13761737380 13564463891
上海交通大学 电子信息与电气工程学院 地 邮 址：东川路 800 号 编：200240
摘 要：本文分模块详细阐述了降压型 DC-DC 开关电源及其控制、反馈电路的设计，并分为