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
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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
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.
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.....................