基于移相全桥的开关电源设计

基于移相全桥的开关电源设计(任务书,论文14300字)
摘  要
当现代电力电子技术不断地创新升级的同时，开关电源技术也在进一步地完成发展和创新，现如今，开关电源（Switch Mode Power Supply，即SMPS）已经被同行业者们称为节能高效型电源，逐渐成为稳压电源未来的研发方向。
开关电源，其功能是采用现代电力电子技术控制功率开关管导通和断开的时间比例，保持稳定的电压输出的一款电源，开关电源通常由脉宽调制（PWM）控制和MOSFET组成，主要分为直流开关电源和交流开关电源，开关电源的存在可以将交流电高效地转换成稳定的直流输出，并且保护和稳定电器。
本文主要设计是一款基于移相全桥的开关电源，利用控制技术和双闭环作用后能够稳定地输出110V直流稳压。首先，本文开篇以开关电源的主电路为切入点，对输入整流电路、变换器、高频变压器和输出整流电路进行深入的研究与设计，其中选择移相ZVS PWM全桥变换器作为核心研究内容之一，通过它实现零电压开关技术，减小损耗，提升效率；其次，对控制芯片ucc3895进行了研究并完成其外部电路设计，实现电压电流双闭环控制；最后，利用仿真软件对主电路和控制电路进行瞬态参数分析和元器件的参数校正，完成输入电压、输出电压、开关管控制信号波形等参数的比较分析，确定设计达到设计要求，并借助仿真平台对上述研究成果的准确性进行验证。
关键词：开关电源  移相全桥  全桥DC/DC变换器  PWM脉宽调制  ucc3895
 
The Design of switching power supply Based on the phase shifting full bridge 
Abstract
With the development and innovation of modern power electronic technology,the switch power technology is also made innovation and development constantly. Switching Power Supply (Switch Mode Power Supply, SMPS) has been known as highly efficient energy-saving Power Supply,which is also the development direction of regulated Power Supply in the future.
Switching power supply,which is mainly using modern power electronic technology to control the ratio of the time of switch tube opening and turn-off, is a kind of supply that can keeps the output voltage of a power supply stable. Generally,switching power supply is made of IC and MOSFET, which can be mainly divided into the dc switching power supply and communication switching power supply. And the existence of the switching power supply can convert alternating current (ac) to efficiently into the stability of the dc output and protect and stabilize the electrical appliances.
The main content of this paper is to design an efficient switching power supply based on phase-shift full bridge, which uses the control technology and double closed-loop effect to output 110 v dc voltage stability. First of all, we choose the main circuit of switching power supply as the starting point to make a deep research for the input rectifier circuit, converter, high-frequency transformer and output rectifier circuit,and select the phase-shift ZVS PWM full bridge converter as one of the main content in the research of the design, which can achieve zero voltage switching technology ,reduce the power loss and improve the system efficiency;Next,studying the control chip of ucc3895 and completing the external circuit design; Finally,we use the simulation software to analyze the transient parameters and components of the parameter calibration in the design,and make an analysis about the input voltage, output voltage, switch tube control signal waveform parameters,through that,can we be sure with the design to meet the design requirements and some simulation research is done to verify its correctness.
KEY WORDS: switching power supply;phase-shifted full-bridge;full-bridge DC/DC converter;PWM mode implementation;ucc3895
 

目  录
摘  要    I
Abstract    II
第一章 绪论    1
1.1 课题研究背景    1
1.2开关电源的发展过程    1
1.3 国内开关电源的研究现状    2
1.4 论文的主要研究内容    2
第二章 主电路的研究与设计    4
2.1 主电路框架设计    4
2.2 输入整流滤波电路的研究与选择    4
2.3 逆变电路电路的研究与选择    5
2.3.1 DC/DC变换器类型简述    5
2.3.2 移相全桥ZVS变换器的研究    8
2.3.3 高频变压器的研究    11
2.4 输出整流滤波电路的研究与选择    12
2.5 主电路的元器件计算    13
2.5.1 输入滤波电容的参数确定    13
2.5.2 开关管和整流二极管的参数确定    14
2.5.3 变压器的参数确定    15
2.5.4 隔直电容与谐振电感的参数确定    15
2.5.1 输出整流电感和输出滤波电感的参数确定    16
2.6 本章小结    17
第三章 控制电路的研究与设计    18
3.1 PWM脉宽调制技术    18
3.2 控制芯片ucc3895的研究及外部电路设计    18
3.2.1 控制芯片ucc3895的简介    18
3.2.2 基于控制芯片ucc3895的控制电路设计    20
3.2.3 控制电路的参数计算    23
3.3 本章小结    23
第四章 基于仿真软件Saber的仿真与调试    25
4.1 整体系统仿真的实现    25
4.1.1 整流滤波后的电压波动对电路的影响    28
4.1.2控制芯片对于电压波动的处理    30
4.1.3输入整流后电压为550V的波形分析    31
4.2 本章小结    33
第五章 总结和展望    34
5.1本文所做工作总结    34
5.2 进一步的研究工作    34
参考文献    35
致  谢    37