共查询到19条相似文献,搜索用时 171 毫秒
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《电子技术与软件工程》2015,(16)
从不同角度来说,功率因数校正(PFC)技术有着不同分类方法,若从电网供电的的方式来看,就可分为单相PFC电路与三相PFC电路,若从校正机理来看,又可分为无源功率因数校正(PPFC)与有源功率因数校正(APFC)两种。故文章从开关电源的PFC原理分析入手,对单相与三相PFC技术作一简要分析。 相似文献
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基于Matlab的交流斩波型PFC电路仿真研究 总被引:1,自引:1,他引:0
为改善传统功率因数校正电路的不足,提出一种新型交流斩波型单相功率因数校正电路的拓扑结构,使开关管处于整流桥的交流侧.该方案有助于提升电路的谐波抑制和功率因数校正能力,可实现单位功率因数,增强电路的电磁兼容性,降低电路的传导损失.仿真结果表明,功率因数可达0.997,仿真结果验证了方案的可行性和理论分析的正确性. 相似文献
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针对传统的两级APFC采用两套控制电路和多个功率开关管增加电路复杂程度及成本的问题,该文采用PFC/PWM复合控制芯片MLA824作为控制核心,并设计了一台160W单相两级式功率因数校正装置.分析了基于平均电流控制的单相两级有源功率因数校正电路的基本原理,提出了以ML4824为核心的单相两级有源功率因数校正装置的设计方... 相似文献
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单相有源功率因数校正电路的设计与仿真研究 总被引:1,自引:0,他引:1
论述了单相功率因数校正(APFC)的原理和方法,通过采用Boost型DC-DC变换器作为功率级,UC3854芯片控制PWM的占空比,并直接驱动MOSFET,使输入电流跟踪输入电压,以提高功率因数。根据设计目标要求对1.2kW平均电流控制的单相Boost功率因数校正电路的主电路及UC3854外围电路参数进行了设计和计算,使功率因数达到了0.9984,并在Orcad环境下进行仿真研究,取得了理想的效果。文中的设计方法和思路对于中小功率直流电源的APFC设计具有一定的借鉴作用。 相似文献
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电力电子设备在各工业领域的广泛应用造成了日益严重的谐波污染问题,有源功率因数校正技术成为解决这一问题的有效方法。文章在分析传统Boost电路导致功率因数降低的原因和Boost APFC原理的基础上,针对目前功率因数校正效果偏低的问题,提出了双闭环融合电流前馈技术的控制策略,搭建了单相Boost APFC实验平台加以验证。实验结果表明,本控制方式具有功率因数高、输出电压稳定、动态响应效果好等优点。 相似文献
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本文介绍了开关电源功率因数校正的基本原理,剖析了有源功率因数校正电路的结构、原理,对比各类APFC的特点,并概括了有源功率因数校正技术的发展方向. 相似文献
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This work presents a low-cost approach to power factor correction (PFC) of single-phase diode rectifiers using a series active filter. Comparing with the traditional PFC, the proposed PFC has lower requirements of power device ratings, which leads to lower cost, higher efficiency, and lower electromagnetic interference. It also can eliminate the bulky inductor needed in the traditional PFC. The topology, operation principle, and application issues of the proposed PFC are analyzed in this paper. The control strategy is discussed in detail and simulation results are provided. A 1-kW prototype is built up and the experimental results are presented to verify the analysis. 相似文献
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基于dsPIC的数字控制PFC研究 总被引:1,自引:0,他引:1
文章基于dsPIC30F6014数字信号控制器(DSC),实现了单相Boost功率因数校正器的全数字控制。开关电源的数字控制实现可采用先进的控制策略,简化系统的结构,缩小体积,提高系统性能。文中提供了单相Boost PFC变换器的完整数字控制解决方案。首先给出了PFC控制系统参数的选择方法;然后讨论了基于dsPIC的Boost PFC的解决方案,包括主电路参数的确定、系统结构和软件设计;最后给出了1000W功率等级的仿真和实验结果,验证了数字控制PFC的优良系统性能。 相似文献
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A review of high-performance, state-of-the-art, active power-factor-correction (PFC) techniques for high-power, single-phase applications is presented. The merits and limitations of several PFC techniques that are used in today's network-server and telecom power supplies to maximize their conversion efficiencies are discussed. These techniques include various zero-voltage-switching and zero-current-switching, active-snubber approaches employed to reduce reverse-recovery-related switching losses, as well as techniques for the minimization of the conduction losses. Finally, the effect of recent advancements in semiconductor technology, primarily silicon-carbide technology, on the performance and design considerations of PFC converters is discussed. 相似文献
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单周期控制无桥Boost PFC电路分析和仿真 总被引:5,自引:1,他引:4
传统有源功率因数校正电路中导通器件多,通态损耗大,不适于中大功率场合应用。新颖的单相功率因数校正电路——无桥Boost拓扑,其结构简单,效率高。文中基于无桥Boost电路,提出一种单周期控制方法,它不需要检测输入电压信号且不需使用乘法器就能实现功率因数校正。单周期控制电路简单可靠,又降低了成本。文中分析了无桥Boost电路及单周期控制的工作原理,并导出了控制系统的稳定性条件。 相似文献
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Fernandez A. Sebastian J. Hernando M.M. Villegas P. Garcia J. 《Industrial Electronics, IEEE Transactions on》2005,52(1):46-55
This work presents a review of power-factor-correction (PFC) circuits for low- and medium-power single-phase power supplies. The main idea is not just to show the state of the art of this topic but to select the most interesting topologies for each application depending on the power level, the input voltage range, and the output voltage. Since IEC 61000-3-2 regulations came into force, many new topologies have been presented trying to obtain a cost-effective solution to reduce the input current harmonic content. Each one of them has its application range due to the inherent characteristics of the topology. Obviously, not every converter is useful for the same application. This is especially perceptible in PFC circuits due to the large amount of different solutions. Hence, this paper tries to show the most appropriate topologies for each application, being the input power and the IEC 61000-3-2 Class some of the main parameters to select it. The scope of the paper is focused on single-phase power supplies belonging to IEC 61000-3-2 Class A and Class D with an input power level below 4 kW. 相似文献
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在不增大输入电流纹波的前提下,为改善升压型功率因数校正变换器在高频状态下的输入电流过零畸变,同时减小电感体积,降低开关器件的电压电流应力,进而提高变换器的功率等级,提出了一种交错式三电平变换器拓扑。此拓扑将交错并联技术与三电平技术相结合,弥补了交错并联拓扑只能改善输入电流过零畸变,而无法提升变换器的其他性能的不足。分析了此变换器的原理及工作情况,并进行仿真,仿真结果验证了该拓扑的有效性。 相似文献
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This paper presents a general technique to derive average current mode control (CMC) laws without input voltage sensing to achieve high power factor for single-phase topologies operating in continuous conduction mode (CCM). The control laws are derived based on the steady-state input-output voltage relationships and the CCM large-signal averaged pulsewidth modulation (PWM)-switch model. Using this methodology, average CMC laws with linear PWM waveforms are discovered for commonly used single-phase power stage topologies such as boost, flyback, SEPIC, and buck/boost. Conventional three-loop-controlled average CMC converters can now be controlled with a two-loop architecture. Hardware results for a boost power factor correction (PFC) and simulation results for flyback, SEPIC, and buck/boost topologies verify operation. The small-signal models of the current loop and voltage loop are derived for the boost topology and are used for control loop design. Input current harmonic distortion measurements demonstrate improved performance compared to the conventional three-loop control technique 相似文献