高频通信开关电源的研究与设计

高频通信开关电源的研究与设计

文档编号:ZD438 文档字数:22664,页数:44，有开题报告，任务书，文献综述

摘要：本文分析了国内外高频开关电源的发展和现状，研究了高频开关电源的基本原理以及高频开关电源在通信系统中的应用，设计出一种实用于电信程控系统的高频开关电源，以替代传统的相控电源。该系统以IGBT作为功率开关器件，构成移相全桥逆变，采用脉宽调制（PWM）技术，它的开关频率为100KHz。PWM控制信号由集成控制器UC3895产生，从输出实时采样电压反馈信号，以控制输出电压的变化，控制电路和主电路之问通过变压器或光电耦合器进行隔离，并设计了软启动和过流保护电路。通过实验证明该系统能安全、可靠运行，达到了设计要求。
关键词：高频开关电源；移相全桥；PWM；MOSFET

High-frequency switch power supply for Competence
Abstract：This paper has analyzed the development of the domestic and international high-frequency switch power and current situation, have studied the basic principle of the high-frequency switch power and high-frequency application in the communication system of switch power, it is practical in the high-frequency switch power of the programmer-controlled system of telecommunications to design one, in order to substitute traditional accusing of the power. System this regard IGBT as power switch device, is it move the whole bridge is it to go against, adopt pulse width modulate (PWM) technology to form, its switch frequency is 100KHz. PWM control signal produce by integrated controller UC3895, sample the feedback signal of the voltage in real time outputting, in order to is it output change of voltage to control, control circuit and main circuit is it isolate through the voltage transformer or the photoelectrical coupler to ask, design soft to start and is it is it protect the circuit to shed to pass. The experimental results show that the System can work safely and reliably.
Keyword：High-frequency switch power； Phase Shifting Control Full Bridge；PWM； MOSFET

目录

前言……………………………………………………………………………………………1
摘要……………………………………………………………………………………………1
第1章高频通信开关电源总体电路设计………………………………………2
1.1概述…………………………………………………………………………………2
1.2 部分电路介绍…………………………………………………………………2
第2章通信开关电源主体电路的设计……………………………………………4
2.1 EMI电路的设计………………………………………………………………4
2.1.1开关电源产生EMI的机理 ……………………………………………5
2.1.2辐射EMI的抑制措施………………………………………………………6
2.1.3 开关电源EMI滤波器的电路设计………………………………………7
2.2 输入整流滤波电路的设计……………………………………………………8
2.3 DC/AC逆变电路设计…………………………………………………………11
2.3.1 全桥式变换器工作方式的选择……………………………………11
2.3.2 电路基本原理……………………………………………………………13
2.3.2 开关管的选择……………………………………………………………16
2.4 高频变压器设计………………………………………………………………18
2.5 输出整流滤波电路的设计…………………………………………………20
第3章 PWM控制电路的设计………………………………………………………22
第4章反馈电路的设计……………………………………………………………29
4.1 系统模型的建立………………………………………………………………29
4.2闭环系统的具体设计…………………………………………………………30
4.2.1电流环的电路设计………………………………………………………30
4.2.2电压环的电路设计………………………………………………………30
第5章各保护、报警电路的设计…………………………………………………32
5.1 软启动电路的设计……………………………………………………………32
5.2 过流过压保护…………………………………………………………………32
5.2.1 限流式保护………………………………………………………………32
5.2.2 切断式保护………………………………………………………………33
5.3 欠压、过压保护………………………………………………………………34
第6章总结…………………………………………………………………………………36
参考文献……………………………………………………………………………………36
致谢…………………………………………………………………………………………37
附录总电路图……………………………………………………………………………38

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