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1、 论文题目：交错并联 Boost PFC 电路研究 工程领域：电子与通信工程 硕 士 生：张龙阁 (签 名) 指导教师：刘树林 (签 名) 摘 要 由于电力电子装置的广泛应用，所引起的电能质量问题受到普遍关注。为此，在电 力电子装置中采用功率因数校正(PFC)技术， 有效改善其对电能质量的影响一直是业界的 研究热点之一。目前，有关 PFC 技术的研究主要集中在提高功率密度、提高效率以及减 小体积等方面。交错并联技术通过多个变换器并联来实现功率分担，可有效降低单个变 换器的功率要求，提升电源的整体功率等级；同时由于相互并联的各变换器之间的交错 运行，也可有效改善电源的各项性能。 本文首先介绍了功
2、率因数校正技术的研究背景与发展现状进行，并对功率因数校正 电路的拓扑、工作模式以及控制方法进行了深入分析。在传统单相 Boost PFC 电路的基 础上，提出了交错并联 Boost PFC 电路，对其工作原理及电路特性进行了分析。另外对 支路参数失配情况下，电路性能的变化进行了研究与仿真，为后续电路设计提供了参考 依据。 最后，研制了基于 UC3854 的交错并联 Boost PFC 电路样机，采用平均电流控制模 式，通过分频电路与驱动电路实现交错控制。设计了主电路、控制电路等的关键元件参 数，利用 Saber 软件搭建了系统闭环仿真平台，通过软件仿真及样机实验验证了理论分 析的正确性以及系统
3、设计的可行性，证明该电路具有良好的功率因数校正效果。 关 键 词：功率因数校正；Boost 变换器；交错并联；电流连续模式 研究类型：应用研究 Subject : Research on Interleaved Boost Power Factor Correction Converter Specialty : Electronics and Communication Engineering Name : Zhang Longge (Signature) Instructor : Liu Shulin (Signature) ABSTRACT Due to the wide applica
4、tion of power electronic devices, power quality problems have caused widespread concern. Thus, one of the hotspots in the research fields to improve the impact on power quality effectively is using the power factor correction (PFC) technology in power electronic devices. The currently research of po
5、wer factor correction technology focused on improving the power density and the efficiency and reducing the volume. Interleaving parallel technology can achieve power sharing through multiple converters in parallel. Using this technology can reduce the individual power requirements of the converter
6、effectively, and enhance the overall power rating of the power supply. Due to the interleaved operation of each parallel converter, this technology can also improve the performance of the power supply effectively. This paper firstly introduces the research background and the development status of po
7、wer factor correction technology. And then, it analyzes the topology, the operation modes and the control methods of the PFC circuit. Based on the traditional single-phase Boost PFC circuit, the paper advances the interleaved Boost PFC and analyses its working principle and characteristics. In addit
8、ion, the paper researchs and simulates the changes of the circuit performance when circuit parameters unmatch and provides the reference basis for subsequent circuit design. Finally, the paper develops an experimental prototype of the interleaved Boost PFC which based on UC3854. Its control strategy
9、 is average current control, the interleaving control is achieved by frequency division circuit and drive circuit. The paper gives the detailed parameter design of the main circuit and control circuit, and uses the Saber software to set up a closed loop system simulation platform. Software simulatio
10、n and prototype experiment verify the validity of the theoretical analysis and the feasibility of the system design, prove that this power factor correction circuit has good correction effect. Keywords: Power Factor Correction; Boost Converter; Interleaved; Continue Current Mode Thesis : Application
11、 Research 目录 I 目 录 1 绪论 . 1 1.1 功率因数校正技术的研究背景 . 1 1.2 功率因数校正技术的发展 . 3 1.2.1 无源 PFC 技术 . 3 1.2.2 有源 PFC 技术 . 5 1.2.3 PFC 技术的发展方向 . 7 1.3 本文的研究意义和主要内容 . 8 1.3.1 本文的研究意义 . 8 1.3.2 本文的主要内容 . 9 2 功率因数校正电路 . 10 2.1 功率因数的定义 . 10 2.2 PFC 拓扑与电路工作模式 . 11 2.3 PFC 电路的控制方法 . 12 2.3.1 CCM 控制方法 . 12 2.3.2 DCM 控制方法 . 16 2.4 Boost PFC 电路工作原理与特性分析 .
