大功率高频开关电源同步整流器研究与设计

发布时间：2018-05-01 10:11

本文选题：开关电源 + 零电压开关　；参考：《广东工业大学》2014年硕士论文

【摘要】：电源是各种电力、电子等设备必不可少的电力源泉。开关电源具有效率高、功耗低、体积小、质量轻等显著优点,电源效率可达到80%以上,远远高于线性电源的转换效率。开关电源有着广泛的发展前景,是电源设计制作的发展方向,也是当今大功率电源研究的主流方向。其应用行业广泛,既包括工业设备领域的电镀、励磁等行业,也包括民用领域的通信、计算机、家用电器、交通设施等。这类领域对电源输出的需求有一个共同的特点：大功率、大电流。然而,由于电流较大的特性,设备损耗问题则显得尤为严重,这意味着提高效率是此类整流器的重点与难点。基于以上需求,本文首先介绍了大功率的开关电源的发展概况及其拓扑结构,详细分析了带有变压器隔离的开关电源中DC-DC变换部分的拓扑结构种类,在此基础上选择了最合适的大功率开关电源拓扑。研究了在开关电源的变压器次级整流中引入的同步整流技术,并结合移相全桥软开关技术(PS-ZVS)分析了所选择的的大功率开关电源同步整流器的电路运行原理及方式。结合大功率开关电源设计的特点以及对电路的分析,对该电源的主要部分进行了参数的计算,并依此为根据对电路各个功率开关管元器件进行了选择,给出了主电路隔离变压器的参数选择及其原副边电压电流大小的计算方法以及高压直流侧、输出侧储能滤波电容与电感的计算方式。同时,本文研究了基于同步整流技术的开关电源的控制方式,提出了一种新的控制架构的控制平台,采用相移式PWM软开关控制芯片UC3879和复杂可编程逻辑器件FPGA协同控制的方式,设计了以UC3879为主控芯片的核心控制板。研究了电路中功率开关管的驱动电路,选择了专用驱动控制芯片并设计了功率器件的专用驱动电路板。采用verilog HDL硬件语言编写了FPGA的控制程序,成功实现了次级同步整流信号控制、PI调节器以及其他各种信号的综合与控制。最后,本文设计了一台高效率的大功率移相全桥零电压开关同步整流器样机作为实验系统,通过在该样机中进行实际实验测试,给出了实验波形,证明了该设计的具有功率大、效率高等特点。
[Abstract]:Power is an essential source of power for all kinds of power, electronics and other equipment. Switching power supply has many advantages, such as high efficiency, low power consumption, small volume, light mass and so on. The power supply efficiency can reach more than 80%, which is far higher than the conversion efficiency of linear power supply. Switching power supply has a broad prospect of development, is the development direction of power supply design and manufacture, but also the mainstream direction of power supply research. It is widely used in many fields, including electroplating, excitation and so on in the field of industrial equipment, as well as communications, computers, household appliances, transportation facilities and so on. This field has a common demand for power output: high power, high current. However, due to the characteristics of large current, the problem of equipment loss is especially serious, which means that improving efficiency is the key and difficulty of this kind of rectifier. Based on the above requirements, this paper first introduces the development of high-power switching power supply and its topology, and analyzes in detail the types of DC-DC transform topology in switching power supply with transformer isolation. On this basis, the most suitable high power switching power supply topology is selected. This paper studies the synchronous rectifier technology introduced in the secondary rectifier of transformer of switching power supply, and analyzes the circuit operation principle and mode of the selected synchronous rectifier of high power switching power supply combined with the phase-shifted full bridge soft switching technology (PS-ZVSs). According to the characteristics of the design of high power switching power supply and the analysis of the circuit, the parameters of the main parts of the power supply are calculated, and according to this, the various components of the power switch cell of the circuit are selected. The parameter selection of the main circuit isolation transformer and the calculation method of the voltage and current at the primary and secondary sides as well as the calculation method of the capacitor and inductance of the high voltage DC side and the output side energy storage filter are given. At the same time, this paper studies the control mode of switching power supply based on synchronous rectifier technology, and puts forward a new control platform, which adopts phase shift PWM soft switch control chip UC3879 and complex programmable logic device FPGA collaborative control mode. The core control board based on UC3879 is designed. The driving circuit of power switch in the circuit is studied, the special drive control chip is selected and the special driving circuit board of power device is designed. The control program of FPGA is programmed by using verilog HDL hardware language, which successfully realizes the synthesis and control of the secondary synchronous rectifier signal control controller and other signals. Finally, a high-efficiency prototype of high-power phase-shifted full-bridge zero-voltage switch synchronous rectifier is designed as an experimental system. The experimental waveform is given through the actual test in the prototype, and the power of the design is proved to be large. High efficiency and other characteristics.
【学位授予单位】：广东工业大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM461

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