基于多电平变换的便携式移动电源的研制

发布时间：2018-04-09 10:26

本文选题：多电平直流变换器　切入点：SPWM波　出处：《重庆大学》2014年硕士论文

【摘要】：便携式移动电源作为电力变换的一个重要分支，，以其稳定、便携、环保的特点作为应急、备用的交流电源在各个领域被广泛使用。在一些特殊的场所，比如煤矿、野外以及发生冰灾、火灾以及地震等自然灾害而造成电能无法正常供给的场所，可以作为备用电源向通讯系统、医疗器械等重要设备供电，从而保证通讯的畅通以及医疗器械等设备正常工作。目前，国内的便携式移动电源市场主要被国外厂家所占领，而且技术水平也和国外有较大差距，研究具有自主知识产权的便携式移动电源，不但具有理论方面的意义，而且具有很高的工程应用价值。便携式移动电源由前级整流环节和后级逆变环节组成。前级整流环节主要由包括三相不可控整流电路和三电平BUCK电路两部分，它的作用是将发电机产生的三相变频变压交流电变换为稳定的直流电；后级逆变环节主要由SPWM波控制的逆变电路和LC滤波电路两部分组成，它的作用是将整流部分得到的直流电变换成符合用户需求的稳压稳频单相交流电。针对目前仍存在的一些问题，本文的主要工作一方面针对方案的不足，继续完善；另一方面研制出实验装置。全文阐述了论文的研究背景与实际意义，对便携式移动电源的特点及国内外发展现状做了介绍，简单的概括了本文的研究内容；结合便携式移动电源的具体要求，确定了其主电路的拓扑结构和整体方案。着重分析了三电平BUCK电路的工作原理，确定了基于单片机反馈控制的均压电路的设计方案，采用闭环控制来对逆变电路进行稳压输出的控制；完成了系统的硬件电路和软件设计。硬件电路包括主电路设计与控制电路设计。软件设计包括主程序方案设计和子程序方案设计。子程序设计主要包括：①信号采样及软件滤波程序设计；②基于三电平BUCK电路输出电压的外环，均压电路内环的双闭环反馈PWM控制；③基于逆变电路输出电压的SPWM反馈控制。搭建了实验装置，给出了实验结果并做了分析，实验结果表明本文方案是正确和可行的。
[Abstract]:As an important branch of power conversion, portable mobile power supply is widely used in various fields because of its stable, portable and environmentally friendly characteristics.In some special places, such as coal mines, fields and places where natural disasters such as ice disasters, fires, earthquakes and other natural disasters cause the normal supply of electrical energy, it can be used as a backup power source to supply power to important equipment such as communications systems, medical devices, etc.In order to ensure the smooth flow of communications and medical equipment and other equipment to work properly.At present, the domestic portable mobile power market is mainly occupied by foreign manufacturers, and there is a big gap between the technology level and foreign countries. It is not only of theoretical significance to study portable mobile power supply with independent intellectual property rights, but also to study the portable mobile power supply with independent intellectual property rights.And has the very high engineering application value.Portable mobile power supply is composed of front stage rectifier link and rear stage inverter link.The front-stage rectifier is mainly composed of three-phase uncontrollable rectifier circuit and three-level BUCK circuit. Its function is to convert the three-phase variable frequency AC voltage generated by the generator into a stable direct current.The back stage inverter consists of two parts: the inverter controlled by SPWM wave and the LC filter. Its function is to convert the rectified DC into stable voltage and stable frequency single phase AC.In view of some existing problems, the main work of this paper is to improve the scheme on the one hand, and to develop the experimental device on the other hand.This paper describes the research background and practical significance of the thesis, introduces the characteristics of portable mobile power supply and the current development situation at home and abroad, briefly summarizes the research content of this paper, combined with the specific requirements of portable mobile power supply,The topology and overall scheme of the main circuit are determined.The working principle of three-level BUCK circuit is analyzed emphatically, and the design scheme of voltage sharing circuit based on single-chip microcomputer feedback control is determined. The closed-loop control is used to control the output voltage of inverter circuit.The hardware circuit and software design of the system are completed.The hardware circuit includes main circuit design and control circuit design.Software design includes main program scheme design and subroutine scheme design.The subprogram design mainly includes the sampling of the 1 / 1 signal and the software filtering program. The outer loop based on the output voltage of the three-level BUCK circuit and the SPWM feedback control based on the output voltage of the inverter circuit based on the double closed loop feedback PWM control of the inner loop of the voltage sharing circuit.The experimental results are given and analyzed. The experimental results show that the scheme is correct and feasible.
【学位授予单位】：重庆大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM46

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