Power factor

About: Power factor is a research topic. Over the lifetime, 60530 publications have been published within this topic receiving 768235 citations. The topic is also known as: electric power factor.

Sliding mode control of a unity power factor AC-to-DC boost converter

Abstract: The subject of the paper is a control scheme that allows achievement of a unity power factor value for a class of power converters commonly addressed as power factor pre- compensators. The primary control objective is to provide a constant level output voltage while keeping a power factor value close to unity, in the presence of unknown parameter uncertainties. Such uncertainties are identified using the sliding mode parameter observer, while the main regulation problem is addressed via the sliding mode control. Numerical simulation is furnished for assessing the performance of the proposed control method.

High-power time-domain measurement bench for power amplifier development

Abstract: A high-power measurement bench is presented, which combines the time-domain measurement system with an active harmonic load-pull. The bench has been developed to support the development of power amplifiers operating at power levels up to least 30W. However, its architecture is scalable with increasing power levels. This paper presents the measurement bench, addressing the key challenges confronted during its realization, and its application for single device optimization.

Non-isolation type AC-AC tri-level converter

Abstract: The present invention discloses a non-isolated AC-AC three-level AC-AC converter which has a structure comprising an input filter, a multilevel converter and an output filter connected in turn Wherein the multilevel converter is composed of a basic constitution unit of two capacitors clamping, an energy-storage inductor and an energy-storage capicitor which are constitued for converting the input voltage to three output levels; the basic constitution unit is composed of a four quadrants power switch and a clamping capicitor By different combinations with the input filter, basic constitution unit and output filter, a circuit topology family for non-isolated AC-AC three-level AC-AC converter including Boost type, Buck-Boost type, Cuk type, Sepic type and Zeta type The invention with improved converting effiency, power density, reduced volume and weight as well as input side power factor is fit for high voltage AC-AC electric power converting, due to the reduced volume and weight of the output filter and improved output waveform quality, the application fields of three-level AC-AC converter can be widened

Robust compensator of harmonics and reactive power

Abstract: This paper presents a robust compensator of harmonics and reactive power for electric power systems, which consists essentially of an electronic source and a robust controller. This compensator permits us to eliminate harmonics to an acceptable level and to compensate reactive power. The control system for this compensator is robust for uncertainties in power system parameters and characteristics of the power electronic source used as the compensator. It is also adaptive to variation of the frequency of the power network. >

ZETA converter with high power factor operating in continuous conduction mode

Abstract: This paper presents the analysis of the ZETA power converter operating in continuous conduction mode (CCM) for power factor correction. The main attractive of the ZETA converter is that it is a naturally isolated structure, which allow a regulated output voltage with only one power processing stage. Principle of operation, mathematical analysis and experimental results are presented.