ZVS移相全桥高频开关电源研究

摘要首先论文阐述 PWM DC/DC变换器的软开关技术，并对其基本工作原理进行阐述，同时给出ZVS软开关的实现策略。
其次，对选定的主电路拓扑结构进行电路设计，包括逆变桥开关管的选择、高频变压器的设计、输出整流二极管的选择、输出滤波电感的设计和输出滤波电容的选择等，给出这些电路中各参数的计算方法及各参量的设计。然后，论述移相控制电路的形成，对移相控制芯片进行选择，同时对移相控制芯片UC3895进行详细的分析和设计。包括对主功率管MOSFET的驱动电路的选择，电压反馈和电流反馈电路的设计和过压、过流保护的实现。最后，基于理论计算，对系统主电路进行仿真，研究其各部分设计的参数是否合乎实际电路。搭建50V80A移相全桥高频开关电源实验平台，在系统实验平台上做了大量的实验。实验结果表明，论文所设计的DC/DC变换器能很好的实现软开关，提高效率，使输出电压得到稳定控制，满载能够稳定工作，具有很好的工程实用价值。
关键词开关电源高频变压器移相控制零电压开关 UCC3895,9016
毕业设计说明书（论文）外文摘要
Title
Abstract
Fristly, the soft-switching technology and the basic principles of PWM DC/DC converter had been expounded in this thesis, as well the realization strategy had been introduced.
Secondly, the main circuit topology，the methods of parameters designing and calculation for main circuit had been given.The selection of switching and output rectifier diode bridge, the design of high frequency transformer and output filter inductor and capacitor etc.
Then, it discussed the form of a phased-shifited circuit, and then chosen chip of phase-shifited in detail. It designed and analysised the driving circuit for the main power devices MOSFET, the circuit of voltage and current feedback had also been designed and it provided the function of the protection for over voltage and current.
Finally, based on theoretical calculation, it simulated the main circuit system, researched the parameters of system’s different parts, and determined whether they accorded with a practical circuit.The article had structed a test platform for phase-sgifted ZVS DC/DC full bridge converter, on which massive experiments had been done.The results indicated the DC/DC converter achieved good soft-switching, improved efficiency, and had stable control of output voltage.
Keywords   switching mode power supply, high frequency transformer, phase-shifted control, zero-voltage-switching , UCC3895
目   次
第1章绪论1
1.1高频开关电源技术研究的意义1
1.2课题研究的背景及现状1
1.3课题所做的工作2
第2章 PWM DC/DC 全桥变换器软开关技术3
2.1 PWM DC/DC全桥变换器的基本工作原理 3
2.2 移相控制ZVS工作原理4
2.3 两个桥臂实现ZVS的区别13
2.4本章小结15
第3章 50V80A主电路设计16
3.1 单相逆变桥的选择16
3.1.1主功率开关的选择16
3.1.2主功率开关管的参数设计17
3.2 高频变压器设计17
3.2.1电磁分析18
3.2.2参数计算20
3.2.3设计及逆变桥选取21
3.3谐振电感的设计23
3.3.1电感值的确定23
3.3.2参数计算及设计24
3.4输出整流电路的选择26
3.4.1输出整流二极管的选择26
3.4.2输出滤波回路的设计26
3.5本章小结28
第4章电源控制回路设计28
4.1 移相控制芯片UC389528
4.1.1 功能框图28 ZVS移相全桥高频开关电源研究:http://www.751com.cn/zidonghua/lunwen_7596.html