单管正激式开关稳压电源的设计_吴位信

本科学生毕业论文

单管正激式开关稳压电源的设计

系部名称：电气与信息工程学院

专业班级：电气11-1班

学生：吴位信

指导教师：洪军

职称：副教授

黑龙江工程学院

二○一五年六月

The Graduation Thesis for Bachelor's Degree

Design of the single pipe is shock type switch regulated power supply

Candidate：Wu Wieixin

Specialty：Construction Machinery

Class：11-1

Supervisor：Associate Prof. Ge Hongjun

Heilongjiang Institute of Technology

2015-06·Harbin

摘要

开关稳压电源有多种类型，其中正激式开关电源因其电路简单可靠，抗过载能力强，所需要的元器件较少，容易集成，不易饱和且能够提供多路隔离输出等优点而被广泛应用于中、小功率电源领域。为了保证电路的稳定可靠，本次设计采用的是隔离型电路，其中以单端正激型变换器作为主电路，其主要由高频变压器与开关管构成，主要功能是处理电能。本文分析了PWM脉宽调制芯片UC3844构成开关电源的整体结构电路，并以UC3844作为主芯片控制功率MOS管P60NF06的导通与截止，而UC3844的启动电压由三端稳压器LM7818输出提供，采样反馈电路以TL431和光电耦合器PC817为核心，而输入滤波电路和输出整流滤波电路主要由电容构成，且对输入干扰和输出纹波电压有了很好的消除作用，使系统更加的稳定可靠，从而完成了单管正激式开关电源的设计。

关键词：开关电源，正激型变换器，PMW，UC3844

ABSTRACT

With the rapid development of power electronic technology, the application of switching power supply is also more and more widely. There are different types of switching power supply, which is the IP switch power supply because of its circuit is simple, reliable, strong overload capacity, the required components less, ease of integration, not easily saturated and can offer the advantages of multiple output isolation and widely applied in the medium and small power sources. This design is given priority to with single correct type excitation converter circuit, mainly consists of high frequency transformer and switch tube, its main function is to deal with electricity. This paper analyzes the PWM pulse width modulation chip UC3844 constitute integral circuit structure and working principle of switch power supply, and by UC3844 as the main control chip control switch tube P60NF06 conduction and deadline, sampling feedback circuit TL431 and photoelectric coupler PC817 as the core, and the input filter circuit and output rectifier filter circuit is mainly composed of capacitor, and the input and output ripple voltage has the very good elimination effect, make the system more stable and reliable, thus complete the single pipe is shock type switching power supply design.

Key words: Switching power supply；Normal shock type converter；PWM；UC3844

目录

摘要 (Ⅰ)

Abstract (Ⅱ)

第一章引言 (1)

1.1 开关电源的国外发展概况 (1)

1.2 课题研究的目的和意义 (1)

1.3课题研究的主要容 (2)

第二章正激式开关电源总体方案的设计 (2)

2.1开关电源变换电路的选择 (2)

2.2 控制电路的选择 (2)

2.2.1单片机控制电路 (2)

2.2.2芯片控制电路 (3)

2.3正激式开关电源的电路结构图 (3)

2.4本章小结 (3)

第三章单管正激式开关电源的设计 (4)

3.1正激式开关电源的工作原理 (4)

3.2变压器的设计 (5)

3.2.1铁芯材料的选择 (5)

3.2.2变压器AP公式推导 (5)

3.2.3变压器的原副边匝数 (8)

3.2.4原副边线径 (9)

3.2.5变压器的缠绕 (9)

3.3电感的设计 (9)

3.3.1导磁材料 (10)

3.3.2电感感值 (10)

3.3.3电感电流峰值 (11)