Good understanding of EMC technology, soft switch technology in field of power supplies and APFC technology concerned
了解EMC电磁兼容相关技术、开关电源的软开关技术、APFC相关技术
Its principle and method are studied. Boost DC-DC converter is taken as power amplifier and UC 3854 is used to control the duty ratio of pulse width modulator and drive MOSFET directly.
研究了APFC的原理和方法，通过采用Boost型DC-DC变换器作为功率级，UC3854芯片控制脉冲宽度调制器的占空比，并直接驱动MOSFET，使输入电流跟踪输入电压，使输入电流与输入电压接近同相位，以提高功率因数。
By tracking the input voltage, the phase of input current follows that of input voltage to improve the power factor. The parameters of the primary circuit and UC 3854 peripheral circuit for a 1.2 kW 400 V Boost APFC cir...
根据设计目标要求对1.2kW400V平均电流控制的单相Boost型APFC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，取得了理想效果。
Boost DC-DC converter is taken as power amplifier and UC 3854 is used to control the duty ratio of pulse width modulator and drive MOSFET directly.
研究了APFC的原理和方法，通过采用Boost型DC-DC变换器作为功率级，UC3854芯片控制脉冲宽度调制器的占空比，并直接驱动MOSFET，使输入电流跟踪输入电压，使输入电流与输入电压接近同相位，以提高功率因数。
The results given by the experiments prove that the design can meet the goal of decreasing the harmonic and reactive power effectively, and the design exhibits a unit power factor approximately.
实验证明采用APFC后，装置达到了功率因数接近1的优良效果，实现了减小谐波与无功的目标。
Finally, the experiment result is shown to prove that the digital control methods have been used can realize good harmonic restrain and high power factor.
文中最后给出了试验结果，验证了数字化的APFC 双环控制策略是完全可以满足低谐波高功率因数的要求的。
The Vbus with high power factor falls from 600V to 400V by using a delay circuit in which a long channel length NMOS is used to substitute a large biasing resistance to save chip area.
通过采用集成在SPIC内部的延迟电路，使有APFC电路的总线电压由600V下降为400V。在电路中，采用长沟道的NMOS管来代替大电阻以节省版图面积。
Principle and class of active power factor correction (APFC) are introduced.
主要介绍了有源功率因数校正（APFC）的工作原理、电路分类。
Optimal Design of Boost APFC Feedback Compensation Network
BoostAPFC电路反馈补偿网络的优化设计
Development of Soft-Switch APFC Equipment for Arc Welding Converter
逆变式弧焊电源软开关APFC装置的研制
Got the flyback transformer calculation method through deriving some formulas. Then, designed clamp circuit, active power factor correction circuit, flyback transformer.
然后，对钳位电路、有源功率因数校正（APFC）电路、反激式变压器进行设计。
This paper first introduces the research results of power factor correction and APFC of domestic and foreign, and then introduces the principle of APFC and its various control programs, this paper chooses average current control program.
本文首先介绍国内外功率因数校正的研究现状以及APFC的研究成果，然后介绍APFC的原理，并在众多控制方案中选用平均电流控制方案。
An adaptive predictive function control (APFC) with PI structure strategy for time-delay systems is developed. This algorithm introduced error and increment error of predictive output signal to the cost function, which makes controller has PI structure.
提出了一种具有PI结构的时滞系统自适应预测函数控制（APFC），该算法通过在性能指标函数中引入预测输出误差和预测输出增量误差，使最终形成的控制器具有比例-积分（PI）结构。
Average current mode control and its application in APFC
APFC技术中的平均电流型控制及其应用研究
It is proved that the output ripple voltage is reduced and power factor is corrected af - ter usage of APFC.
实践证明采用APFC后，输出电压纹波大大降低，实现了功率因数校正。
The results show that both output ripple voltage and distortion of input current crossover in this circuit reduce greatly, and the power factor is above 0.99.
实验结果表明前级APFC环节输出电压纹波大大降低，输入电流交越失真大为改善，功率因数达到099以上。
Firstly, the features of APFC digital control chip are introduced, then analyzes the principle of digital control APFC based on OCC scheme and determine the sampling frequency and method of the measurement, and the digital controller parameter of voltage loop is designed.
首先介绍APFC数字控制芯片的特点，然后分析了单周期控制数字APFC的工作原理，确定了控制信号的采样频率和测量方法，并对电压环数字控制器的参数进行了详细的设计。
Simulation results show that by use of APFC technology the harmonics and reactive current in charging current of DVR can be actively eliminated and both voltage stability and dynamic response of DC energy storage unit can be improved.
仿真结果表明采用APFC技术能够主动消除DVR充电电流中的谐波和无功电流，提高储能单元的电压稳定性和动态响应性能。
APFC technology is widely used for its wide input range, small size, little weight and high power factor.
而其中的APFC技术以其输入电压范围宽、体积小、重量轻、功率因数高等优势，得到了尤其广泛的应用。
Experimental results show that the AC/DC converter can work well with satisfactory performance parameters in the universal input range of AC 95~250 V.
实验结果表明文中所设计的带APFC的AC/DC变换器在宽广的输入电压范围（95～250V）下能够正常工作，各项性能指标均符合要求。