高功率因数数字化软开关充电机研究

发布时间：2018-05-25 01:17

本文选题：数字化 + 功率因数校正　；参考：《合肥工业大学》2017年硕士论文

【摘要】：本文围绕着高功率因数数字化软开关这个课题进行深入详细的研究,目的是研究具有高功率因数、低开关损耗的充电机。本文所研究的充电机为两级结构,前级是为了提高电网资源利用效率,解决负载对电网高次谐波污染而设计的整流器,本文针对前级整流器详细介绍了选择升压电路的原因,将不同的DC-DC拓扑电路的特点做了说明。本文选择芯片UC3854作为前级的控制芯片实现高功率因数,文中详细介绍了该芯片的优点和工作原理。移相全桥零电压开关变化器结构简单、性能优良,该变换器作为充电机的后级,通过移相控制,实现软开关,大大减小开关损耗,文中详细分析了变换器的工作过程以及控制方式。围绕这一结构,分析实现零电压导通需要的条件和占空比丢失的原因,详细说明了硬件电路的设计过程。储蓄电池的充电方式决定了用电效率,影响电池的寿命,选择合适的方式至关重要,本文最后针对该方面进行了分析说明。本文在变换器小信号模型分析的基础上设计了数字化控制系统,并给出了相应的控制算法,根据实验要求编写了软件,文中以程序流程图的形式展现出来,同时利用MATLAB仿真软件中的Simulink模块对主电路进行了仿真分析。根据350V输出电压、10A的输出电流的要求,本文设计了一台输入电源为220V单相交流电实验样机。通过实验结果可知充电机的功率因数高于0.99,全桥电路中的四个开关管均实现了零电压导通,程序运行正常,实现了输出侧恒压充电和恒流充电,同时实现了控制芯片与电脑的信息交互。
[Abstract]:In this paper, the digital soft switch with high power factor is studied in detail in order to study the charger with high power factor and low switching loss. The recharger studied in this paper is a two-stage structure, the former stage is a rectifier designed to improve the efficiency of power grid resource utilization and solve the high harmonic pollution caused by the load. In this paper, the reason of selecting the boost circuit for the former rectifier is introduced in detail. The characteristics of different DC-DC topology circuits are explained. In this paper, the chip UC3854 is chosen as the control chip to realize the high power factor. The advantages and working principle of the chip are introduced in detail. The phase-shifting full-bridge zero-voltage switch changer is simple in structure and excellent in performance. As the rear stage of the charger, the converter realizes soft switching by phase-shifting control, which greatly reduces the switching loss. The working process and control mode of the converter are analyzed in detail. Around this structure, the condition of realizing zero voltage conduction and the reason of duty cycle loss are analyzed, and the design process of hardware circuit is explained in detail. The charging mode of the storage battery determines the efficiency of electricity, affects the life of the battery, and it is very important to choose the right way. Finally, this paper analyzes and explains this aspect. In this paper, a digital control system is designed based on the analysis of small signal model of the converter, and the corresponding control algorithm is given. According to the requirements of the experiment, the software is written, and the software is presented in the form of program flow chart. At the same time, the main circuit is simulated and analyzed by Simulink module in MATLAB simulation software. According to the output current requirement of 350V output voltage 10A, a 220V single-phase AC experimental prototype is designed in this paper. The experimental results show that the power factor of the charger is higher than 0.99, the four switches in the full bridge circuit have realized zero voltage conduction, the program is running normally, and the output side constant voltage charging and constant current charging are realized. At the same time, the information interaction between the control chip and the computer is realized.
【学位授予单位】：合肥工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM910.6

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