一种新型高频开关电源的设计

一种新型高频开关电源的设计(任务书,开题报告,论文16500字)
摘要
随着电力电子技术的发展以及绿色节能概念的深入人心，人们对于电源技术越来越成为人们关注的重点。其中小型化、轻量化、节能化以及高效化等优点也逐渐成为人们对电源的基本要求，而且随着各类消费电子产品的普及，低压输出的开关电源也越来越多。
本文设计了一款基于反激式变换器的AC-DC开关电源，分析并阐述了反激式电路的工作原理，简单分析了几种常用开关电源拓扑结构的优劣。最终选择了单相桥式整流电路与反激式变换器结合的主电路结构和电流模式的控制方式，并给出了总体的结构框图。
对电路的各个子模块进行了深入的分析，确定了各部分在工作时的电量以及需要的器件规格。例如：计算整流电路中晶闸管中通过的电流以及其承受之电压，据此确定晶闸管规格。以此为例，还确定了变换器中各个开关器件的损耗与选型，滤波环节中各个元件规格的选择以及开关电源核心部分——高频变压器的设计。变压器设计包括铁芯选择、绕组匝数计算、绕组的导线规格以及变压器得检验。控制部分选用UC3844芯片为控制芯片，文中介绍了芯片引脚的作用以及与芯片功能配套的电压信号采集电路以及电流信号采集电路工作原理与构建过程。

使用MATLAB/Simulink对电路进行测试与修正。根据仿真结果，开关电源设计达到预期效果，本文所设计的开关电源基本达到理论要求，设计的可行性得到初步证明。
关键词：反激式变换器 UC3844电流控制模式 变压器设计 

Design of a New High Frequency Switching Power Supply
Abstract
With the development of power electronics technology and the deepening of the concept of green energy conservation, people have increasingly focused on power technology. Among them, the advantages of miniaturization, light weight, energy saving, and high efficiency have gradually become the basic requirements for people. With the popularization of various consumer electronics products, there are more and more low-voltage output switching power supplies.
In this paper, an AC-DC switching power supply based on flyback converter is designed. The working principle of the flyback circuit is analyzed and expounded, and the advantages and disadvantages of several common switching power supply topologies are simply analyzed. Finally, the main circuit structure and the current mode control method of the single-phase bridge rectifier circuit and the flyback converter are selected, and the overall structural block diagram is given. [资料来源：Doc163.com]
Various sub-modules of the circuit were analyzed in depth to determine the power of each part at work and the required device specifications. For example: Calculate the current passing through the thyristor in the rectifier circuit and its withstand voltage, and determine the specifications of the thyristor accordingly. Taking this as an example, the loss and selection of each switching device in the converter, the selection of the specifications of each component in the filter section, and the design of the high-frequency transformer, themostimportant part of the power supply, have also been determined. Transformer design includes core selection, winding number calculation, wire size of the winding, and transformer test. The UC3844 chip is used as the control chip in the control part. The function of the chip pin and the voltage signal acquisition circuit and the current signal acquisition circuit supporting the chip function are introduced in this paper.
Simulate the circuit using MATLAB/Simulink, and repeatedly modify and optimize the circuit parameters. According to the simulation results, the switching power supply design achieves the desired effect. The switching power supply designed in this paper basically meets the theoretical requirements and the feasibility of the design has been initially proved. [来源：http://www.doc163.com]
Keywords: Flyback Converter; UC3844; Current control mode; Design of Transformer
 
开关电源的技术参数，例如：输出电压范围，功率传输效率，输出波纹大小，复杂电磁工作环境下可靠性等等，是设计开关电源的依据。我们需要根据开关电路的技术标准确定开关电源的主电路拓扑与控制电路结构，确保设计出开关电源能满足使用需求。本课题设计的AC-DC开关电源的技术标准如下：
1、V_in：AC 220V±10%。
2、V_out：15V±5%。
3、η：≥75%。
4、波纹幅值：≤0.15V。
5、∆V_out：≤1%。
6、绝缘电阻：≥100MΩ。
7、工作温度：-55℃~+125℃。
同时力求开关电源的小型化
  [资料来源：www.doc163.com]

目录
摘要    I
ABSTRACT    II
第一章 绪论    1
1.1 研究背景与意义    1
1.2 国内外开关电源研发现状    2
1.3 本课题研究内容与论文架构    4
1.3.1 本课题研究内容    4
1.3.2 论文架构    4
第二章 电路系统设计    5
2.1 开关电源的技术参数    5
2.2 主电路拓扑选择    5
2.3 开关电源的控制结构    8
2.3.1 输出电压的调制    8
2.3.2 电路控制方式选择    9
2.4 本章小结    10
第三章 开关电源硬件设计    12
3.1 整流电路分析    12 [资料来源：https://www.doc163.com]
3.1.1 晶闸管选择    12
3.2 DC-DC变换器分析    13
3.2.1 功率变压器分析    13
3.2.2 直流变换电路中其余器件选型    19
3.3 滤波环节设计    21
3.3.1 输入端的滤波器件选型    21
3.3.2 输出端的滤波器件选型    22
第四章 开关电源的控制与保护    23
4.1 开关电源的主控制回路    24
4.2 工作电流检测与保护回路    25
第五章 仿真结果分析    27
第六章 工作总结    31
参考文献    33
致谢    36 [资料来源：http://www.doc163.com]