terça-feira, 30 de abril de 2013
domingo, 28 de abril de 2013
quarta-feira, 24 de abril de 2013
terça-feira, 23 de abril de 2013
domingo, 14 de abril de 2013
Design and Implementation of Paralleled Multi-Inverter Systems with Redundancy and Hot-swap Features
Design and Implementation of Paralleled Multi-Inverter Systems
with Redundancy and Hot-swap Features
Student: Jia-Wei He Advisor: Tsai-Fu Wu, Ph.D.
Yaow-Ming Chen, Ph.D.
Institute of Electrical Engineering
College of Engineering
National Chung Cheng University
This thesis proposes redundancy and hot-swap features for paralleled
multi-inverter systems with voltage control and current weighted distribution
control (CWDC) strategy. With a CWDC strategy, instantaneous current is fed
back and monitored; thus, weighted output current distribution and fast regulation
among the inverters can be achieved for linear and nonlinear loads. Additionally,
the proposed paralleled system is equipped with the features of redundancy and
hot-swap; therefore, system power rating can be expanded readily and it has high
maintainability. Simulation results and hardware measurements from a
two-inverter system with either equal or different power ratings have demonstrated
the feasibility of the proposed control scheme in fast regulation and weighted
current distribution. The proposed redundancy and hot-swap features have
improved reliability and stability of the paralleled multi-inverter system.
with High Power Factor
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.
A New Single-Stage Power Factor Correction AC/DC Converter Topologies with Low Voltage Stress for Universal Line Application
FULL PAPER READ
quarta-feira, 10 de abril de 2013
Center for Advanced Studies in Engineering, Pakistan
About meDr. Kamran received his M.S. and Ph.D. in Electrical Engineering from Georgia Institute of Technology, Atlanta, GA USA in 1992 and 1995 respectively. His area of research was control of power converters. Dr. Kamran has several years of teaching experience besides multiple years of electronic system design experience working in industry, both in Pakistan and in USA. He worked with Silicon Power Corporation, PA, USA on the development of next generation power converters for US Navy during 1996. He moved to Pakistan in 1997 and started teaching at GIKI. He has designed and implemented large-scale distributed computer network systems like the toll collection and access control system for the Motorway (M2) in Pakistan.
domingo, 7 de abril de 2013
This is a video showing three operations of Surplec HV's BIL testing tower. The BIL is a high-voltage testing device used to create artificial lightning, in order to test the resistance of the equipment to a bolt. Most high-voltage equipment are made to whitstand an enormous amount of voltage for a short period of time, about 10 seconds. This BIL tower has a power of 1,600,000 Volts, so it is able to test equipments that go up to 345KV. Watch carefully, it strikes three times in the 11 minutes. If you blink, you'll miss it.
Watch the white tube with the windows to see the lightning at 4:32, 6:21 & 11:20.
A CHINA APUESTA EN LA CIENCIA Y TECNOLOGIA ,INVIERTE JUNTO CON LA EMPRESAS EN SUS INGENIEROS,HACIENDO QUE ESTUDIEN DOCTORADO Y POST-DOCTORADO,LA MAYORIA DE ELLOS TRABAJAN EN LAS INDUSTRIAS,LOS QUE TRABAJAN EN LA UNIVERSIDADES HACEN INVESTIGACION Y DESARROLLO ,NO SOLO SE LIMITAN A DAR CLASES,COMO OCURRE EN MUCHOS PAISES LATINOAMERICANOS.
quarta-feira, 3 de abril de 2013
VISITANDO A 27 FEIRA INTERNACIONAL DA INDUSTRIA ELETRICA ELETRONICA ENERGIA AUTOMAÇAO MAIOR FEIRA DA AMERICA DO SUL,RECICLANDO CONHECIMENTOS,ATUALIZANDO TECNOLOGIAS,VISITANDO AMIGOS EMPRESARIOS,COLEGAS PROFESIONAIS.AMISTADES NOVAS,APRENDER COISAS NOVAS E ANALIZANDO AS TENDENCIAS DO MERCADO MUNDIAL.