REVISTA ELETRICIDADE MODERNA JANEIRO 2013 ONLINE

VOCE PODE LEER A EDIÇÃO DIGITAL ONLINE NO SEGUINTE ENDEREÇO :

http://www.arandanet.com.br/midiaonline/eletricidade_moderna/2013/janeiro/index.html

TOPOLOGICAL ISSUES IN SINGLE-PHASE POWER FACTOR CORRECTION Vlad Grigore

TOPOLOGICAL ISSUES IN SINGLE-PHASE
POWER FACTOR CORRECTION
Vlad Grigore
Dissertation for the degree of Doctor of Science in Technology to be presented with
due permission for public examination and debate in Auditorium S4 at Helsinki
University of Technology (Espoo, Finland) on the 30th of November, 2001, at 12
noon.
Helsinki
Helsinki University of Technology
Department of Electrical and Communications Engineering
The equipment connected to an electricity distribution network usually needs some kind of power
conditioning, typically rectification, which produces a nonsinusoidal line current due to the
nonlinear input characteristic. With the steadily increasing use of such equipment, line current
harmonics have become a significant problem. Their adverse effects on the power system are well
recognized. They include increased magnitudes of neutral currents in three-phase systems,
overheating in transformers and induction motors, as well as the degradation of system voltage
waveforms. Several international standards now exist, which limit the harmonic content due to line
currents of equipment connected to electricity distribution networks. As a result, there is the need
for a reduction in line current harmonics, or Power Factor Correction - PFC.

LINK FULL PAPER
http://www.mediafire.com/view/?uze0ux32zgq9xep

INTERNATIONAL RECTIFIER Class D Audio Group Presentation by Manuel Rodriguez And Jun Honda

Agenda
-
Why Class D?
Product Offerings
Benefits
Roadmap
Key IC Features
DirectFET® Features
-
Single Side PCB with IRS2092DIP
FULL APRESENTAÇAO  AUDIO CLASE D
http://www.mediafire.com/view/?wwdc2aa1n2e4cig

單階功因修正線路 在發光二極體照明燈具應用之實現 THE IMPLEMENTATION OF SINGLE-STAGE PFC SCHEME FOR THE LED POWER LIGHT APPLICATION

單階功因修正線路
在發光二極體照明燈具應用之實現


THE IMPLEMENTATION OF SINGLE-STAGE PFC SCHEME
    FOR THE LED POWER LIGHT APPLICATION

研究生：鍾任富（Jen-Fu Chung）
指導教授：黃淑絹（Prof. Shu-Chuan Huang）

大同大學
電機工程研究所
    碩士論文
Thesis for Master of Science
Department of Electrical Engineering
Tatung University


ABSTRACT
This thesis mainly presents an implementation of a single-stage Power
Factor Correction (PFC) scheme for the low power LED light application.
As mater of fact, the circuit key idea is from the definition of power factor,
that is the input current must follow the voltage all the time. The PF value is
predicted and set properly by the proposed design equations and circuit
architecture. Detail operation principles, algorithms, and experimental results
are offered, and the experimental results based on 24V 700mA LED down
light prototype schematic are also provided. The final PF value reaches as
high as 0.980 which already satisfied the "ENERGY STAR": PF>0.9 for
commercial application. In addition, the current harmonics were passed in
IEC61000-3-2, too.

Index Terms: Boost Converter, Flyback converter, Single stage PFC.

Modern Transformerless Uninterruptable Power Supply (UPS) Systems brahim Güne 1, Bülent Üstüntepe2, and Ahmet M. Hava3 1,2 ENEL Energy Electronics Company, 34794 Istanbul TURKEY

Department of Electrical and Electronics Engineering, Middle East Technical University, Ankara, TURKEY
hava@metu.edu.tr

Abstract
Uninterruptable power supplies (UPS) are widely used to
supply critical loads and provide reliable and high quality
energy to the load. Until recently, on-line UPS systems with
isolation transformer have been widely employed. However,
transformerless modern UPS systems have been rapidly
replacing the old technology due to their superior
performance and size attributes. Transformerless UPS
systems have utility friendly input performance and high
quality output voltage waveform. Furthermore, smaller size,
higher efficiency, and increased reliability are features that
spread the transformerless products, rendering the
transformer technology obsolete. In this paper, modern
transformerless UPS systems with the 6-300kVA range will
be discussed and their experimental performance will be
illustrated. Input and output power quality performances,
energy efficiency performance, and size/weight information
will be provided on modern commercial transformerless
UPS products.
FULL PAPER
http://www.mediafire.com/view/?1qa4b97k4axl7u4