提高无源逐流电路功率因数的一种方法

无源逐流功率因数校正电路由于成本低、性能好,目前在国内得到了广泛的应用。但是这种电路存在着电流谐波成分相对较高,功率因数改善有限。不能满足更高的电磁兼容标准的要求。提出了一种改进的无源逐流功率因数校正电路,并且以28W荧光灯为负载,对比进行了实验分析研究。改进的无源逐流功率因数校正电路在不增加成本的情况下,获得了进一步减少电流谐波成分,提高功率因数,更好地满足电磁兼容标准的结果,具有更高的实用价值。     

功率因数校正与实现

本文主要讨论了不良功率因数的产生原因、危害,谐波电流的主要来源,功率因数的定义与计算,谐波电流对电网的威害,功率因数校正和提高功率因数的意义等内容。     

功率因数校正与实现

本文主要讨论了不良功率因数的产生原因、危害,谐波电流的主要来源,功率因数的定义与计算,谐波电流对电网的威害,功率因数校正和提高功率因数的意义等内容.     

使用无源功率因数校正和波峰因数控制的荧光灯镇流器设计方案

电力质量标准是为了最有效地使用电能而制定的一个国际标准。由于环境的限制，增加更多的发电量变得越来越困难，从而，提高使用效率的责任就从供电部门转到电力使用者身上。     

利用谐振电抗器实现单相无源功率因数校正

本文详细描述了一种新型基于谐振电抗器原理的单相无源功率因数校正（PFC）技术，可以适用于各种变频家用电器。在对其工作原理进行较为详细理论分析的基础上，进行了完整的仿真分析和实验研究，指出了这种无源PFC的最佳设计目标参数选择方法，给出了有关仿真与实验的波形和数据，并进行了分析比较。结果表明，这种无源PFC方案的输入谐波电流校正效果良好，直流回路电压利用率最高，而且具有散热处理，安装方便与价格低廉等特点，可以作为较大功率的单相C-DC变换器为后级逆变器-压缩机系统供电。     

电子镇流器中的有源功率因数校正电路

针对荧光灯电子镇流器和高压钠灯电子镇流器中功率因数校正技术的发展,总结了典型的有源功率因数校正应用电路报电路的基本工作原理,并在高压钠灯镇流器中得到了应用。     

2 kW有源功率因数校正电路设计

有源功率因数校正可减少用电设备对电网的谐波污染,提高电器设备输入端的功率因数.详细分析有源功率因数校正APFC(active power factor corrector)原理,采用平均电流控制模式控制原理,设计一种2 kW有源功率因数校正电路.实验结果表明:以TDA16888为核心的有源功率因数校正器能在90～270V的宽电压输入范围内得到稳定的380V直流电压输出,功率因数达0.99,系统性能优越.     

2kW有源功率因数校正电路设计

有源功率因数校正可减少用电设备对电网的谐波污染,提高电器设备输入端的功率因数。详细分析有源功率因数校正APFC(active power factor corrector)原理,采用平均电流控制模式控制原理,设计一种2 kW有源功率因数校正电路。实验结果表明:以TDA16888为核心的有源功率因数校正器能在90～270 V的宽电压输入范围内得到稳定的380 V直流电压输出,功率因数达0.99,系统性能优越。     

一种改进的ZCT无桥功率因数校正电路设计

为了降低开关损耗,提高变换器的效率,提出了一种改进的零电流转化软开关无桥功率因数校正电路,实现了变换器主开关管和辅助开关管的零电流导通和零电流关断,有效地减小了导通损耗,提高了电路的效率。详细分析了电路的工作模态、工作条件和主开关管的导通损耗。仿真和实验结果表明,该功率因数校正电路实现了输入电流对输入电压的良好跟踪,功率因数高,谐波含量少,效率较传统的全桥功率因数校正电路有明显的提高。 关键词：全桥;零电流转换;无桥;功率因数校正     

无源无损软开关功率因数校正电路的研制

采用无源无损软开关功率因数校正电路技术及UC3854BN控制器件,完成了一台1kW样机的设计。实验结果验证了设计的正确性和可行性,各项性能指标均达到设计要求。     

Techniques to obtain single-stage power supplies with power factor correction (PFC)

In order to comply with the standards, the input current of the switch mode power supplies (SMPS) must be almost sinusoidal, i.e. the SMPS must achieve power factor correction. This requirement is normally reached with the use of an additional input converter, typically a boost, resulting in a two-stage SMPS with the inherent drawbacks: high cost and the necessity of high efficiency in each stageto obtain a reasonable global efficiency. This article introduces two simple techniques together with the control strategies that can be used to obtain single-stage SMPS, that allow the control of the output voltage and the sinusoidal input current wave shaping, without any additional stage. Another objective of this article is to investigate and to evaluate the performance of each topology that emerged from the chosen technique. Considering high-power applications, experimental results of two single-stage full-bridge topologies are also presented, in order to verify the concepts introduced in the article.     

Comprehensive review of high power factor ac-dc boost converters for PFC applications

High power factor rectifiers have been consolidated as an effective solution to improve power quality indices in terms of input power factor correction, reduction in the total harmonic distortion of the input current and also regulated dc voltages. Within this context, this subject has motivated the introduction of numerous converter topologies based on classic dc-dc structures associated with novel control techniques, thus leading to the manufacturing of dedicated integrated circuits that allow high input power factor by adding a front-end stage to switch-mode converters. In particular, boost converters in continuous current mode (CCM) are widely employed since they allow obtaining minimised electromagnetic interference levels. This work is concerned with a literature review involving relevant ac-dc single-phase boost-based topologies with high input power factor. The evolution of aspects regarding the conventional boost converter is shown in terms of improved characteristics inherent to other ac-dc boost converters. Additionally, the work intends to be a fast and concise reference to single-phase ac-dc boost converters operating in CCM for engineers, researchers and experts in the field of power electronics by properly analysing and comparing the aforementioned rectifiers.     

基于Sepic电路的工业照明设备节能电源设计

在照明领域,LED发光产品的应用正吸引着世人的目光,LED作为一种新型的绿色光源产品,必然是未来发展的趋势。 LED驱动电源作为LED照明的核心技术之一,功率因数及效率一直偏低,成为阻碍LED照明工程化应用推广的主要瓶颈。基于Sepic拓扑并带有功率因数校正的LED驱动电源不仅能有效地提高功率因数及效率,降低无功损耗,同时对于节能减耗、降低成本也有非常重要的意义。     

基于BCM的有源功率因数校正电路的实现

分析整流电路的拓扑结构和工作模式,探讨该整流电路关键参数的选取依据,提出临界导电模式（BCM）功率因数校正Boost开关变换器的设计方法。仿真结果表明．所设计的以MC33262为核心的临界导电模式有源功率因数校正（APFC）电路能在90～270V的宽电压输入范围内输出稳定的400V直流电压,并使得功率因数达0．99,系统性能优越．达到设计要求。     

数字控制金卤灯电子镇流器样机设计

本文基于金卤灯电子镇流器数字控制策略分析的基础上,对其电路拓扑的主电路和控制电路进行设计,即对PFC、DC/DC、DC/AC三级结构的主电路及控制电路模型和参数进行选择、设计,并研制了一台高功率因数低频方波输出的数字控制金卤灯电子镇流器,通过对实验结果分析验证了所提出的数字控制方案是可行的。     

功率因数校正控制器FAN7527及应用电路

FAN7527提供简易和高性能有源功率因数校正（PFC）,对需要最小PCB面积,减少元件数量和低功率消耗的电子镇流器及高密度电源应用是最适宜的。本文介绍了FAN7527的功能、特点及应用电路。     

Optimized design of a fully soft-switched boost-converter suitable for power factor correction

A fully soft-switched boost-converter using a one auxiliary switch is presented here. It uses the minimum number of components in the auxiliary circuit with minimum current stress of the main switch. Since the resonant capacitor charges only through an inductor and a diode, the circuit conduction losses are minimized. The main and auxiliary insulated gate bipolar transistor (IGBT) switches share a common emitter connection, facilitating direct drive to them. Various operating modes of the converter are presented in detail and analysed. The choice of the resonating capacitor and inductor has been done through an optimization process based on the guiding equations working under different modes. In this optimization process, emphasis has been given on minimum voltage stress on the auxiliary switch for a wide duty cycle range of operation. Based on the design, the principle of operation has been verified with computer simulation. Experimental results from a laboratory prototype with active power factor correction confirms the operation of this converter.