【作者】 罗明；

【导师】 杨金明；

【作者基本信息】 华南理工大学 ， 电力电子与电力传动， 2010， 硕士

【摘要】 随着现代通讯技术的飞速发展,对通讯电源的重量、体积、可靠性、效率等提出了更高的要求。而应用于中大功率场合的移相全桥DC/DC变换器具有结构简单、输出功率大、效率高、易实现软开关、功率开关管所承受的电压电流应力小等一系列优点,因此,对它进行研究具有十分重要的意义。首先,论文阐述了移相全桥ZVS DC/DC变换器的基本工作原理,分析了移相全桥变换器的几个关键性问题:滞后臂ZVS的实现、副边占空比丢失、变压器原边直流分量的抑制、输出整流二极管的寄生振荡和二极管换流;同时对带辅助网络的移相全桥ZVS DC/DC进行了分析。其次,对移相全桥变换器主电路各参数进行了设计,其中包括:输入滤波电容、高频变压器、功率开关管MOSFET、谐振电感、输出滤波电感、输出滤波电容、隔直电容等,同时给出了48V /50A通信电源主电路各参数的值。此外,本文在分析buck变换器小信号模型的基础上,建立了移相全桥DC/DC变换器的小信号模型,并用MATLAB仿真软件对系统的稳定性进行了分析。由于移相全桥DC/DC变换器是一个非线性、复杂系统,常规PID控制已经不再适用了,为提高对复杂系统的控制性能,本文提出了一种新的控制方式-模糊PID控制。将PID控制与模糊控制的优点融为一体,取得了良好的控制效果。最后,本文还对常规PID控制、常规模糊控制和模糊PID控制进行了MATLAB的仿真比较,结果表明,与常规PID控制和常规模糊控制相比,模糊PID控制的系统具有更好的静态性能和动态性能。更多还原

【Abstract】 With the rapid development of modern communication technology, the power used in communication need higher requirements, such as the weight, volume, reliability, efficiency. The application of high-power full-bridge converter has a simple structure, high output power, high efficiency, easy to realize soft-switching, the small of the power switch voltage and current stress suffered, therefore, it is of great significance for its research.Firstly,the thesis has explained the basic principle of the phase shift controlled ZVS DC / DC full-bridge converter, and analyzed the full bridge converter of some key problems: lagging leg to achieve zero-voltage, the duty cycle loss, the transformer primary side DC component of the inhibition, the output rectifier diodes parasitic oscillation and diode commutation. At the same time, the Phase Shift Full Bridge ZVS DC / DC with the network were analyzed.Secondly,the thesis has selected the main circuit topology and has given the methods of parameters designing and calculation for 48V/50A main circuit , including the design of input filter capacitors, high frequency transformer, power switch MOSFET, resonant inductor, output filter inductor, the output filter capacitor and blocking capacitors. Meanwhile, it has established small-signal modeling for the full bridge ZVS DC/DC converter. At last, it has introduced the conventional PID controls, fuzzy control and fuzzy PID principles, and then analyzed, compared, obtained fuzzy PID has a good dynamic performance and static performance with the MATLAB simulation. Finally, based on fuzzy PID control, the thesis has made a modeling and simulation for 48V/50A ZVS DC / DC full-bridge converter.The results show that the design phase full-bridge DC / DC converter can well realize the soft switching, efficiency, output voltage with good stability. Through phase full-bridge DC / DC converter’s introduction, analysis, design, modeling and simulation, it provided guidance for phase shift full bridge converter.更多还原