基于单片机的恒流开关电源-新教程.docx

基于单片机的恒流开关电源 PAGE  PAGE 36  毕 业 论 文（设 计） 中文题目： 基于单片机的恒流开关电源 英文题目：MCU-based switching power supply design 姓 名 学 号 专业班级 指导教师 提交日期 摘要 本开关电源设计采用STC12C5A60S2单片机发生47KHZ的PWM脉冲信号，经过IR2104控制MOS，从而控制整个BUCK（降压式变换）电路。单片机内部自带的10位ADC能通过电压电流检测电流实时反馈电流和电压数值，并由此调整输出的PWM的占空比，形成电流电压闭环控制系统。按键能设置输出电流从0.2A到2A，以0.01A递增，输出最大10V，液晶能显示实时输出电流与电压。根据测试，满载的供电效率为88%。按键设置的输出电流的误差小于0.01A。 关键词：开关电源，BUCK，STC单片机，IR2104，恒流源 MCU-based switching power supply design Abstract The switching power supply design uses STC12C5A60S2 microcontroller PWM pulse signal 47KHZ happen, after MOS driver IC IR2104 control the whole BUCK circuit. MCU comes with 10 internal ADC voltage detection current by real-time feedback current and voltage values, and thereby adjust the output PWM duty cycle, forming a voltage closed-loop control system. Button can set the output voltage from 0V to 10V limit of, 1V steps, the LCD can display real-time output voltage and current. 10W at the rated power output, full load power efficiency of 81%. Buttons to set the output voltage error is less than 0.1V.. Key words: Switching power supply BUCK STC microcontroller IR2104 Adjustable output 目录  TOC \o 1-2 \h \z \u  HYPERLINK \l _Toc420231877 1 前言  PAGEREF _Toc420231877 \h 1  HYPERLINK \l _Toc420231878 1.1课题研究意义  PAGEREF _Toc420231878 \h 1  HYPERLINK \l _Toc420231879 1.2研究现状及存在问题  PAGEREF _Toc420231879 \h 1  HYPERLINK \l _Toc420231880 1.3研究内容和方式  PAGEREF _Toc420231880 \h 2  HYPERLINK \l _Toc420231881 2系统分析  PAGEREF _Toc420231881 \h 4  HYPERLINK \l _Toc420231882 2.1 系统论述  PAGEREF _Toc420231882 \h 4  HYPERLINK \l _Toc420231883 2.2 Buck工作原理  PAGEREF _Toc420231883 \h 4  HYPERLINK \l _Toc420231884 2.3 Buck波形分析  PAGEREF _Toc420231884 \h 5  HYPERLINK \l _Toc420231886 2.4 Buck稳压分析  PAGEREF _Toc420231886 \h 6  HYPERLINK \l _Toc420231887 2