PWM-PD多路输出直流变换器的研究

发布时间：2018-06-27 04:49

本文选题：多路输出 + 正反激变换器　；参考：《东北石油大学》2014年硕士论文

【摘要】：由于供电系统的需要，高性能、高可靠性，小体积的供电设备在电信和数据通信系统中受到越来越多的关注。在现在的用电设备里，如常见的计算机和其他的电子设备，都需要多个等级的电压同时为其供电，如果每一个用电设备所需要的各个等级电压都使用一个单独的变换器，这样必然使设备的体积和成本增加。便携式电子产品的发展对其供电设备提出了越来越高的要求，多路输出开关电源作为便携式用电设备的供电电源，已经成为人们研究的热点及未来发展的趋势。本文通过对多路输出开关电源的基本拓扑结构、工作原理和适用范围进行了系统研究和比较后，针对普通直流变换器需要额外的磁复位电路，造成供电设备体积大，负载电流大小的改变对输出电压影响大，以及电路效率普遍不高等缺点，，综合了正激变换器和反激变换器的优点，设计了一款正反激电路拓扑结构电路，并对该正反激电路的工作模式进行了分析，把正反激电路拓扑结构作为本文设计的三路输出直流变换器其中一路输出，有效提高了电路效率，减轻了设备体积。通过分析比较现有的多路输出直流变换器的控制方法，针对这些控制方法不能对输出电压进行精确控制，电路交叉调整率高的缺点，本文采用脉宽调制脉宽延迟技术对设计的三路输出直流变换器进行控制。运用小信号模型分析法对其等效电路进行了分析和计算，并通过仿真方法进行了验证，计算及仿真方法得出的结果一致。采用本文设计的电路结构和控制方法，在有效提高多路输出直流变换器的效率同时有效改善其交叉调整率。
[Abstract]:Due to the need of power supply system, high performance, high reliability, small volume power supply equipment has attracted more and more attention in telecommunication and data communication systems. In today's electrical equipment, such as common computers and other electronic devices, multiple levels of voltage are required to power them at the same time, and if each level of voltage required for each of the devices uses a separate converter, This will inevitably increase the volume and cost of the equipment. The development of portable electronic products has put forward higher and higher requirements for its power supply equipment. As a power supply for portable electrical equipment, multi-output switching power supply has become a hot spot and future development trend of people. In this paper, the basic topology, working principle and applicable range of multi-channel output switching power supply are systematically studied and compared, and the additional magnetic reset circuit is needed for ordinary DC / DC converter, which results in the large volume of power supply equipment. The change of load current has great influence on the output voltage, and the circuit efficiency is not high. This paper combines the advantages of forward converter and flyback converter, and designs a topology circuit of forward and flyback circuit. The working mode of the forward and flyback circuit is analyzed. The topology of the forward and flyback circuit is used as one of the three output DC / DC converters designed in this paper, which effectively improves the circuit efficiency and reduces the volume of the equipment. By analyzing and comparing the existing control methods of multi-channel DC / DC converter, the disadvantages of these control methods are that the output voltage can not be controlled accurately and the circuit cross adjustment rate is high. In this paper, pulse width modulation (PWM) pulse-width delay technique is used to control the designed three-channel DC / DC converter. The equivalent circuit is analyzed and calculated by using the small signal model analysis method, and verified by the simulation method. The results obtained by the calculation and the simulation method are consistent. The circuit structure and control method designed in this paper can effectively improve the efficiency of the multi-channel DC / DC converter and improve its crossover adjustment rate.
【学位授予单位】：东北石油大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM46

【参考文献】