IMPLEMENTATION OF THREE-PHASE FED DC POWER SUPPLY SYSTEM WITH HIGH POWER FACTOR CHUNG YUAN CHRISTIAN UNIVERSITY

In this thesis, a high efficiency power supply system with high
power factor is proposed for high power applications. The studied power
supply system consists with a three-phase three-switch power factor
corrector (PFC) and a phase-shifted zero-voltage-transition full-bridge
DC/DC converter with current doubler rectification. High power factor
input can be achieved by the adopted PFC circuit with a simple
configuration. The phase-shifted operation of the full-bridge DC/DC
converter provides the zero-voltage-switching (ZVS) features for the
bridge switches to reduce the switching losses effectively. The current doubler rectification reduces significantly the secondary rectification losses. Therefore, high efficiency can be also accomplished. The detailed operating principle and design consideration of this power supply system are analyzed and described. A 1.1kW 55V/20A laboratory prototype was implemented  and  tested.  The  experimental  waveforms  verify  the feasibility of the proposed design. The implemented power supply system exhibits optimum performances such as high power factor, high efficiency, simple configuration and high reliability. 
LINK THESIS
http://www.mediafire.com/view/?sf7319xgbi4q0o9 

Automatic Test System for Type Tests of the Uninterruptible Power Supply

 Aalto university school of electrical engineering HELSINKI FINLAND
 Abstract of the master's thesis
 Author: Esa Nummijoki Title: Automatic Test System for Type Tests of the Uninterruptible Power  Supply Date: 27.3.2012 Language: English
 Number of pages:10+59 Department of Electrical Engineering Professorship: Industrial Electronics Code: S-81
 Supervisor: Prof. Seppo J. Ovaska Instructor: M.Sc. (Tech.) Risto Karola
Testing is an essential part of product development. In UPS product development, di erent tests are made every day. Testing requires large variety of measurement instruments and other equipment such as large load systems and di erent kind of test con gurations. Signi cant number of performed tests are based on the UPS type tests de ned in the IEC-62040 standard. Testing consumes a lot of time and that way also resources. To solve this problem, an automatic test system for type tests is considered. The aim of this thesis was to clarify the need for the automatic test system, and clarify requirements needed to realize it. The work was done by reviewing the type tests and di erent parts of an automatic test system. In addition, an experimentation was made, resulting a prototype. The prototype is able to automatically perform an indicative e ciency test for the UPS. Furthermore, a possibility to automate the most complex type test, a dynamic output performance test, was examined. This examination resulted a description of the test process and LabVIEW programs, supporting the execution of the test. However, the conclusion was that it is not sensible to automate the test, due to the fact that it is not often performed and automating the test requires a lot of time and resources. The review and the experimentation proved that realization of an automatic test system, able to perform all the type tests, requires large amount of time and resources. Due to this, the automatic test system for type tests is not the best solution to reduce the time and resources consumed by testing.
LINK FULL THESIS
http://www.mediafire.com/view/?g4pagyhlpoeqwh5

Super Course in Physics for the IIT-JEE: Electricity and Magnetism By Trishna Knowledge Systems

Space Vector PWM Control for 3kW Brushless Motor Driver Design and Application for Novel Parallel Hybrid Electric Vehicles

ABSTRACT
In recent years, owing to the environmental protection concept has risen and
global warming, it is important to reduce the environmental pollution. If the merits
of both internal combustion engine and permanent magnet synchronous motor
(PMSM)  can be integrated to become a hybrid electric  vehicle, it must have
ultra-low pollution and energy-saving but still keeping high performance.
For this reason, the central purpose of this thesis is to develop a novel parallel
hybrid  electric  vehicle  system  driver  and  controller.  Electronic motor  control
systems used by extremely versatile digital signal processor (DSP). The important
space vector pulse-width-modulation (SVPWM) technology is applied to the PMSM
control to provide more efficiency of the hybrid electric vehicle. The SVPWM
technology is also guarantees the system to be stable with better performance.
Subsequently, by way of experiment results have proved the SVPWM technology
provides more and more performance of the PMSM and the SVPWM technology
have been applied in hybrid electric vehicle with high efficiency.
Finally, a prototype of the hybrid electric heavy-duty motorcycle has been
established  and  it  has  been  exhibit  on  the “Taipei  international  automobile
electronics show” at the Taipei world trade center in 2007.
LINK
http://www.mediafire.com/view/?49glo7f3rm3rzij

Guia de carreiras: engenharia elétrica

FONTE ORIGINAL

http://g1.globo.com/educacao/guia-de-carreiras/noticia/2012/08/guia-de-carreiras-engenharia-eletrica.html

Muito se fala do aumento da demanda por engenheiros civis no Brasil, mas as grandes obras de infra-estrutura, impulsionadas pelo crescimento econômico e os grandes eventos esportivos mundiais que o país vai hospedar nos próximos anos, também têm aquecido o mercado de outras engenharias, entre elas a elétrica. "Quando você tem metrô expandindo, estádios de futebol, trens, aeroportos, você precisa ter um sistema de energia elétrica para
atender tudo isso", explicou Fábio Bergamini Tangerino, de 32 anos.

Formado em engenharia elétrica pela Universidade Federal de Itajubá (Unifei), Tangerino atualmente trabalha como supervisor de engenharia na Alstom Grid, em um projeto de energia hidrelétrica do Rio Madeira, na Região Norte do país.

Segundo ele, o engenheiro eletricista é o profissional responsável pela construção e manutenção de sistemas de geração, transmissão e distribuição de energia elétrica. Sua atuação acontece principamente em empresas e indústrias que fabricam ou usam equipamentos elétricos e sistemas de automação. Alguns exemplos incluem grandes construtoras, fabricantes de sistemas elétricos e aparelhos eletrônicos, além das empresas que prestam serviço de telecomunicações ou possuem linhas de montagem.

Atualmente há muita demanda por engenheiros que trabalham com subestações, linhas de transmissão e sistemas de automação e controle. "Não tem muitos profissionais qualificados no mercado e todas as empresas do setor encontram dificuldade para encontrar", diz Tangerino.