PWM新型开关电源系统的分析与设计+电路图
开关电源因其体积小、重量轻、高频化等优点被人们熟悉和使用。电网滤波，整流滤波电路，逆变器模块，输出整流滤波和辅助电源等几个功能块构成开关电源。在此基础上，这里我们设计了一个12V的高频开关稳压电源，用于满足一些电子设备的电源要求。50573
本论文设计的开关电源的主电路采用的是半桥拓扑结构，其中L6591作为控制IC,该芯片是一种具有固定频率的先进PWM控制器，采用了软开关技术，实现高频的同时，降低了开关损耗并且克服了开关噪声等技术难题。
其中，控制回路以L6591芯片为主要模块，其中重点确定了高频变压器的型号选取。控制回路主要包含芯片驱动电路的设计，反馈电路以及辅助电源模块的设计。
毕业论文关键词：PWM 开关电源 软开关
Abstract In recent years, electronic equipment and gradually penetrate into people's daily lives. These electronic products in the use of the process but needs the support of various internal power supply, and therefore can not be separated switching power supply.
Switching power supply because of its small size, light weight, high frequency, etc. are familiar and use. Grid filter, rectifier filter circuit, inverter modules, output and auxiliary power rectifier filter function blocks and several other switching power supply. On this basis, here we designed a 12V high-frequency switching power supply, to meet some of the power requirements of electronic equipment.
In this paper, the main circuit switching power supply design uses a half-bridge topology, which L6591 as the control IC, the chip is a fixed frequency of advanced PWM controller, using the soft-switch technology, high frequency while reducing switching losses and switching noise to overcome technical problems.
Among them, the control loop L6591 chip as the main module, which focused on identifying high-frequency transformer model selection. The control loop mainly includes the design of the chip driver circuit, the feedback circuit and the auxiliary power supply module.
Keywords: Pulse Wide Moduation Switching Power Supply Soft switching
目 录
摘要 I
Abstract II
1 绪论 1
1.1 选题背景和意义 1
1.2 国内外研究现状 1
1.3 开关电源的发展方向 2
1.4 本论文的主要研究内容和预期目标 4
2 开关电源的工作原理分析 5
2.1 开关电源的基本原理 5
2.2 基本变换器的主电路拓扑 6
2.2.1 Buck变换器 6
2.2.2 Boost变换器 6
2.2.3 Cuk变换器 7
2.2.4 Buck-Boost变换器 8
2.3 隔离式变压器的DC-DC变换器拓扑结构 9
2.3.1 单端正激式电路 9
2.3.2 单端反激式电路 10
2.3.3 推挽式电路 11
2.3.4 半桥式电路 11
2.3.5 全桥式电路 12
2.3.6 准谐振开关变换器 13
2.4 PWM控制方式基本工作原理 14
2.5 开关电源技术指标 15
3 开关电源主回路的设计 16
3.1 开关电源整流滤波电路的设计 16
3.1.1 输入端整流滤波电路的设计 16
3.1.2 输出端整流滤波电路的设计 18