Lecture - 30 Three Phase System

PSPICE FOR CIRCUITS THEORY AND ELECTRONICS DEVICES

P Spice For Circuit Theory And Electronic Devices from Ajla Hasani

Liebert NXL Battery Ground Fault Test

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

GLORIOSA PROMOCION XIX INGENIERIA ELECTRONICA UNIVERSIDAD NACIONAL MAYOR DE SAN MARCOS 1985 LIMA PERU

SALUDOS DESDE SAO PAULO A MI ALMA MATER UNIVERSIDAD NACIONAL MAYOR DE SAN MARCOS FACULTAD DE INGENIERIA ELECTRONICA 1985-LIMA -PERU
PADRINO ING. SEIICHI KARIYA

Development of a Power Factor Corrected High Current Supercapacitor Charger for a Surge Resistant UPS Zhang, Xu

Development of a Power Factor Corrected High Current Supercapacitor Charger for a Surge Resistant UPS

Zhang, Xu

Identifier: http://hdl.handle.net/10289/7048

Date: 2012

Type: Thesis

Degree Name: Master of Science (MSc)

Publisher: University of Waikato

Rights: All items in Research Commons are provided for private study and research purposes and are protected by copyright with all rights reserved unless otherwise indicated.

Abstract:

The Uninterrupted Power Supplies (UPSs) provide short term power back up to electrical loads when the mains power fail. Usually UPSs employ battery packs as the energy storage device. However the limitations of battery packs can affect the UPS performance.
As an alternative energy storage device, the supercapacitor (SC) technology is well developed over the past 30 years. Due to recent developments, single cell commercial supercapacitors are available up to about 5000 farads. Over the past 10 years, supercapacitor direct current (DC) voltage ratings have gradually increased to about 2.7 V/cell. New lithium based supercapacitor families have DC ratings up to 3.5 V/cell. For the high current applications, the supercapacitors have some advantages over batteries, which are the low effective series resistance (ESR), high power densities and high surge withstand capability.
This thesis is a continuation of the work begun by Kozhiparambil, P. K. on Surge Resistant Uninterrupted Power Supply (SRUPS). The reason for this continual research is due to identify weaknesses in original of SRUPS work with regard to the design of the charger. To reduce the components contain, also achieve common mode transient rejection capability, a flayback mode high current charger with power factor correction has been developed for charging the SC banks.
The prototype circuit includes multiple SC banks to transfer the energy from the 240 V, 50 Hz power line to the load maintaining high isolation level. The loads receive continuous and surge free power from the SC banks, and has electrical isolation from the main power line. An IGBT is used as a switch for the flyback charger, which has the advantage of high current capability.
The experimental results show the design was valid for the SRUPS and it demonstrated the capability to transfer the energy through a flyback charger with power factor correction.

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