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论文编号:DQ180 论文字数:23143,页数:49
摘 要
近年来，电力电子装置在军事、工业、农业、生活及高新技术领域的应用日趋广泛，电力电子技术已成为工程技术领域的关键技术之一。然而电力电子产品的广泛应用，对电网造成了严重的谐波污染,功率因数校正技术（Power Factor Correction）是电力电子产品满足绿色环保要求的必需手段，是未来开关电源发展的关键技术之一。
本文对Boost型APFC电路的功率因数校正技术进行了分析和研究。首先，主要介绍了功率因数（PF）的基本概念和PFC的发展和国内外科研动态,并说明了本文研究的主要内容。其次简单地介绍了无源功率因数校正技术,详细地说明了有源功率因数校正技术的基本工作原理, APFC的主电路拓朴及其控制方式和PFC电路的性能比较。接着，进行BOOST拓扑分析,讲述了在CCM控制方式下工作模式,设计了Boost AFPC整体电路的结构框图。再接着，给出了给出了主电路参数的计算过程及结果,主要包括升压电感、输出电容和功率器件。然后就着，先介绍APFC控制常用的专用集成芯片UC3854的内部结构及其工作原理,再是给出了控制电路参数的计算过程及结果,包括乘法器的设置、振荡频率的确定、峰值电流限制、驱动电路的设计和反馈补偿网络的初步设计。最后,第六章为全文小结，总结了本文的研究内容,并提出了进一步工作的设想。
关键词 谐波,有源功率因数校正，Boost变换器，电感电流连续模式,UC3854
Abstract
In recent years, Power electronic devices are wildly used in the military, industry, agriculture, life and high-tech applications, and power electronics has become one of the key technologies in the field of engineering. But due to wide applications of the electronic products, serious harmonic waves are produced. Now power factor correction has become one of necessary means which can satisfy the requirements of environmental protection. It is one of the key technologies in the future development of switching.
In this paper, Boost circuit for APFC had been analyzed in detail. First, the paper is the Introduction of this paper and mainly introduces the basic concept of PFC, the development of Power Factor, scientific research at home and abroad and the main content of this paper. Second, it briefly introduces the passive power factor correction, then it describes the fundamental principle of the APFC in detail, the control methods, the main circuit topology of APFC, and compares the performance of PFC circuit. Third, it analyzes BOOST topology, describes in the control work patterns of CCM, then designs the overall structure of the Boost AFPC circuit. Fourth, it presents the calculated process of the main circuit’s parameters and results, which mainly includes boost inductor, the output capacitor and power devices. Fifth, it explains the interior structure and working principles of the integrated chip-UC3854 which is commonly used in APFC control, then presents the calculated process of the controlled circuit’s parameters and results, which mainly includes the multiplier’s settings, the oscillation frequency identification, the peak current limit, the design of dynamic circuit and feedback the preliminary design of the compensation network. Finally, Chapter 6 summarizes the full text, sums up the contents of this paper, and puts forward the idea of further work.
Key words Harmonic, Active Power Factor Correction（APFC）, Boost Converter, CCM,
UC3854
目 录
1 绪论…………………………………………………………...............1
1.1 功率因数校正(PFC)问题的提出...…………………………………………..1
1.2 功率因数（PF）的基本概念………………………………………………….2
1.3 PFC的发展和国内外科研动态………………………………………………..4
1.4 本文研究的主要内容…………………………………………………….......5
2 功率因数校正技术………………………………………………...........6
2.1 无源功率因数校正……………………………………………………............6
2.2 有源功率因数校正……………………………………………………………6
2.2.1有源功率因数校正的基本原理……………………………………………6
2.2.2 APFC的主电路拓扑……………………………………………………..7
2.2.3 APFC的控制方法………………………………………………………..8
2.3 PFC电路的性能比较…………………………………………………………10
3 Boost型 APFC电路结构………………………………………………...13
3.1 BOOST拓扑分析……………………………………………………………….13
3.2 在CCM控制方式下工作模式的分析……………………………………………14
3.3 CCM状态下的电流正弦化……………………………………………………...15
3.4 Boost AFPC整体电路的结构框图……………………………………………...16
4 250W APFC电路设计……………………………………………………..18
4.1 主电路设计 18
4.1.1 升压电感的设计……………………………………………………………..18
4.1.2 输出电容的选择……………………………………………………………..20
4.1.3 功率器件的选择……………………………………………………………..21
4.2 控制电路设计………………………………………………………..23
4.2.1 UC3854简介………………………………………………………………..23
4.2.2 乘法器的设置………………………………………………………………26
4.2.3 振荡频率的确定…………………………………………………………….28
4.2.4 峰值电流限制………………………………………………………………28
4.2.5 驱动电路的设计…………………………………………………………….29
4.2.6 反馈补偿网络的初步设计…………………………………………………...29
4.3 试验结果及分析………………………………………………………………...30
5 结论…………………………………………………………...................32
致谢…………………………………………………………………………33
参考文献…………………………………………………………………….34
附录A( 250W样机电路原理图)………………………………………………………36
