全桥全波式高频隔离AC-AC变换器的研究

摘要本文研究了一种全桥全波三电平高频隔离式AC/AC变换器，该变换器以全桥全波式DC/DC变换器的电路结构为基础，将其中的单向开关管全部替换为双向功率开关管，同时并联二极管，得到多电平转换器的基本的开关单元。同时，负载侧与输入电源侧通过高频变压器连接，实现了高频电气隔离，减小了输入电源侧与负载侧的互相影响。该变换器由、输入交流电源、输入滤波电感Li、两个钳位电容Cd1/Cd2、全桥式多电平变换器、理想高频变压器、输出周波变换器、输出LC滤波器以及负载级联而成。三电平使得输出波形更接近理想正弦波，适用于大功率、大容量交流变换场合。该AC/AC变换器采用电压瞬时值的反馈控制策略，可以根据输出负载的变化，及时对SPWM信号进行控制，从而调整输出波形，得到理想输出波形。20902
关键词三电平高频隔离全桥全波 AC-AC变换
毕业设计说明书（论文）中文摘要
毕业论文设计说明书（论文）外文摘要
Title Research on a full bridge full-wave three-level high-frequency isolated AC-AC converter
Abstract
This paper studies a full-bridge full-wave high-frequency isolated three-AC level AC / converter, this converter which is originated from full-bridge full-wave DC/DC converter,uses two-way power switch to replace all one-way switch to build multi-level converter to get the basic switching unit.Meanwhile the load and the supply side is connected by high-frequency transformer to achieve a high-frequency electrical isolation and reduce the interaction of the load and supply side.The converter is composed by the input AC power supply, input filter(Li), two clamp capacitor Cd1/Cd2, full-bridge multi-level converter, ideal high-frequency transformer, the output cycle converter and the output LC filter and load cascade.Three-level makes the output closer to the ideal sine wave and is suitable for high-power, high-capacity AC/AC conversion applications.This AC / AC converter use the instantaneous value of the voltage feedback control strategy which is based on changes in the output load and is able to adjust SPWMl timely signal to control the output waveform to obtain the desired output waveform.
Keywords   Three-level High-frequency isolation Full-wave    AC/AC converter ,
目次
1 绪论    1
1.1 电子变压器    1
1.2 高频电子变压器    1
1.3 AC-AC变换器背景    3
1.4 AC/AC变换技术分类    4
1.5 AC-AC变换器的发展现状    5
1.6 AC-Ac变换器的控制策略    5
1.7 新颖的AC-AC变换器的拓扑结构    7
2 三电平直流变换器    9
2.1 三电平非隔离式直流变换器    9
2.2 三电平隔离式直流变换器    11
3 全桥全波三电平高频环节AC-AC变换器    13
3.1 电路拓扑结构    13
3.2 工作过程及原理    14
3.3 控制原理    18
3.4 稳态工作时输出性能分析    22
4 仿真    24
4.1 仿真电路图    24
4.2 仿真结果    28
结论    33
致谢    34
参考文献35
1 绪论
1.1 电子变压器
电子变压器件是电源装置中的重要元件之一，在电路中起到至关重要的作用。其中较为重要的七个功能如下所示:
a.电压和功率变换
b.改变输出频率作用包括倍频或分频全桥全波式高频隔离AC-AC变换器的研究:http://www.751com.cn/zidonghua/lunwen_12856.html