發(fā)布時間：2018-05-25 01:17

  本文選題：數(shù)字化 + 功率因數(shù)校正��； 參考：《合肥工業(yè)大學(xué)》2017年碩士論文

【摘要】：本文圍繞著高功率因數(shù)數(shù)字化軟開關(guān)這個課題進行深入詳細的研究,目的是研究具有高功率因數(shù)、低開關(guān)損耗的充電機。本文所研究的充電機為兩級結(jié)構(gòu),前級是為了提高電網(wǎng)資源利用效率,解決負載對電網(wǎng)高次諧波污染而設(shè)計的整流器,本文針對前級整流器詳細介紹了選擇升壓電路的原因,將不同的DC-DC拓撲電路的特點做了說明。本文選擇芯片UC3854作為前級的控制芯片實現(xiàn)高功率因數(shù),文中詳細介紹了該芯片的優(yōu)點和工作原理。移相全橋零電壓開關(guān)變化器結(jié)構(gòu)簡單、性能優(yōu)良,該變換器作為充電機的后級,通過移相控制,實現(xiàn)軟開關(guān),大大減小開關(guān)損耗,文中詳細分析了變換器的工作過程以及控制方式。圍繞這一結(jié)構(gòu),分析實現(xiàn)零電壓導(dǎo)通需要的條件和占空比丟失的原因,詳細說明了硬件電路的設(shè)計過程。儲蓄電池的充電方式?jīng)Q定了用電效率,影響電池的壽命,選擇合適的方式至關(guān)重要,本文最后針對該方面進行了分析說明。本文在變換器小信號模型分析的基礎(chǔ)上設(shè)計了數(shù)字化控制系統(tǒng),并給出了相應(yīng)的控制算法,根據(jù)實驗要求編寫了軟件,文中以程序流程圖的形式展現(xiàn)出來,同時利用MATLAB仿真軟件中的Simulink模塊對主電路進行了仿真分析。根據(jù)350V輸出電壓、10A的輸出電流的要求,本文設(shè)計了一臺輸入電源為220V單相交流電實驗樣機。通過實驗結(jié)果可知充電機的功率因數(shù)高于0.99,全橋電路中的四個開關(guān)管均實現(xiàn)了零電壓導(dǎo)通,程序運行正常,實現(xiàn)了輸出側(cè)恒壓充電和恒流充電,同時實現(xiàn)了控制芯片與電腦的信息交互。
[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.
【學(xué)位授予單位】：合肥工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM910.6

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本文編號：1931421