Experiencia KOLFF / ABB Expo Hospitalaria

ON SEPTIEMBRE 15, 2016
KOLFF ha concluido su participación en la Séptima versión de la Expo Hospitalaria, la cual se desarrolló entre los días 06 y 08 del presente mes en el centro de eventos Centro Parque. En esta ocasión hemos contado con el apoyo y participación de la empresa ABB en todo lo relacionado a tecnología de UPS. Unidos concretamos reuniones comerciales con los profesionales a cargo de los departamentos de prevención y seguridad de grandes centros hospitalarios del país.
FUENTE ORIGINAL DE LA NOTICIA
http://kolff-e.com/2016/09/15/experiencia-kolffabb-expo-hospitalaria/

High-Efficiency Three-Phase Current Source Rectifier Using SiC Devices and Delta-Type Topology Ben Guo University of Tennessee

High-Efficiency Three-Phase Current Source Rectifier Using SiC Devices and Delta-Type Topology 
A Dissertation Presented for the Doctor of Philosophy 
Degree The University of Tennessee, Knoxville
High-Efficiency Three-Phase Current
Source Rectifier Using SiC Devices and
Delta-Type Topology
A Dissertation Presented for the
Doctor of Philosophy
Degree
The University of Tennessee, Knoxville
Ben Guo

December 2014
Abstract 
In this dissertation, the benefits of the three-phase current source rectifier (CSR) in high power rectifier, data center power supply and dc fast charger for electric vehicles (EV) will be evaluated, and new techniques will be proposed to increase the power efficiency of CSRs. A new topology, referred as Delta-type Current Source Rectifier (DCSR), is proposed and implemented to reduce the conduction loss by up to 20%. By connecting the three legs in a delta type on ac input side, the dc-link current in DCSR can be shared by two legs at the same time. To increase the switching speed and power density, all-SiC power modules are built and implemented for CSRs. The switching waveforms in the commutation are measured and studied based on double pulse test. Four different modulation schemes are compared for high efficiency CSR considering the switching characteristics of different device combinations. The most advantageous modulation scheme is then identified for each of the device combinations investigated. A compensation method is proposed to reduce the input current distortion caused by overlap time and slow transition in CSRs. The proposed method first minimizes the overlap time and then compensates the charge gain/loss according to the sampled voltage and current. It is verified that the proposed method can reduce the input current distortion especially when the line-to-line voltage is close to zero. The dc-link current will become discontinuous under light load in CSRs, when the traditional control algorithm may not work consistently well. To operate CSR in discontinuous current mode (DCM), the CSR is modeled in DCM and a new control algorithm with feedforward compensation is proposed and verified through experiments.
LINK ORIGINAL  WEB
http://trace.tennessee.edu/cgi/viewcontent.cgi?article=4357&context=utk_graddiss

ADVANCE THREE PHASE POWER FACTOR CORRECTION SCHEMES FOR UTILITY INTERFACE OF POWER ELECTRONIC SYSTEMS A Thesis by MESAAD WALEED ALBADER -Texas A&M University

ADVANCE THREE PHASE POWER FACTOR CORRECTION SCHEMES FOR UTILITY INTERFACE OF POWER ELECTRONIC SYSTEMS A Thesis by MESAAD WALEED ALBADER Submitted to the Office of Graduate and Professional Studies of Texas A&M University in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE

Chair of Committee, Prasad Enjeti
Co-Chair of Committee, Hamid Toliyat
Committee Members, Shankar P. Bhattacharyya
Won-Jong Kim
Head of Department, Chanan Singh
August 2014
ABSTRACT
 Modern power electronic systems operate with different voltage and/or frequency rating such as Adjustable speed drive, Micro Grid, Uninterruptable Power Supplies (UPS) and High Voltage DC Transmission Systems. To match power electronic systems with the mains supply, DC link converters are used. The first stage of the DC link converter is the AC/DC conversion (rectifier). The rectifier type utility interface has substantial harmonics result in poor power quality due to low power factor and high harmonic distortion. Power Factor Correction (PFC) schemes are effective methods to mitigate harmonics and address this issue. In this thesis, analyses of three approaches for high power density rectifiers are developed. In the first study, modular three phase boost rectifiers operating in DCM are coupled in order to increase the power density. Major drawback of this rectifier is the high currents ripple in both the source and the DC link sides which require large EMI filter size -could be larger than the rectifier component size- and large DC filter capacitor size. This thesis proposes coupling modular three phase boost DCM rectifiers, the currents in both source and DC link sides are interleaved and consequently the currents ripple dramatically decreased results in small component size of the EMI filter and the DC filter capacitor leading to high power density rectification. Also, optimization of the number of the rectifier modules to achieve maximum power density is presented. Moreover, the switching function of each rectifier employs harmonic injection technique to reduce the low order harmonics. And, the DC output voltage is varied with the load power such that the operation is at the boundary between CCM and DCM to achieve maximum power density tracking.
 LINK ORIGINAL THESIS
http://oaktrust.library.tamu.edu/bitstream/handle/1969.1/153331/ALBADER-THESIS-2014.pdf?sequence=1

Eric Giler: A demo of wireless electricity

Eric Giler: A demo of wireless electricity
LINK https://www.ted.com/talks/eric_giler_demos_wireless_electricity

TESLA Wireless Power Transmitter and the Tunguska Explosion of 1908 -Беспроволочная технология передачи энергии Н.Тесла и Тунгусский взрыв

Nikola Tesla and Tunguska On June 30, 1908, over 100 years ago, a huge explosion destroyed over 1,000 miles of a very remote and sparsely inhabited region of central Siberia. The exact date of the event is very uncertain because nobody from the outside reached the region until 1927, and there is an 11 day difference between the Julian calendar then used by the Russians, and the Gregorian calendar which supplanted the Julian calendar. In 1582, Pope Gregory XIII massacred the calendar by taking out 11 days in the month of October. The Russians did not convert to the Gregorian calendar until after the 1917 Russian Revolution. About June 30,1908, a huge explosion completely devastated a 2,600 square kilometer area of Siberia. This explosion was 1,000 times more powerful than the Hiroshima atomic bomb, and larger than the devastation caused by subsequent nuclear bomb testing by the U.S. and Russia. Because of the remote location, the Russian Revolution, and Civil War, an expedition did not reach Tunguska until 1927. Initial reports said that it was a meteorite because a celestial phenomenon like the northern lights or aurora borealis could be seen as far south as London. This explosion was not a meteorite or visitors from outer space....It was the work of the super Serbian scientist named Nikola Tesla.
 SOURCE ORIGINAL
http://www.reformation.org/tesla-and-tunguska.html

Circuit Theory I

Lecture Notes

Week	Lecture	Notes
Week 1	Circuit Theory I: goals and underlaying assumptions
Week 2	Circuit Variables
Week 3	Circuit Elements
Week 4	Resistive Circuits
Week 5	Circuit Analysis Techniques and Theorems
Week 6	Operational Amplifier
Week 7	Operational Amplifier Imperfections
Week 8	Energy Storage Elements and transformers
Week 9	First order RC and RL circuits Examples of Sequential Switching Circuits
Week 10	RLC circuits: part a   part b Anant Agarwaland Jeffrey Lang, course materials for 6.002 Circuits and Electronics, Spring 2007. MIT OpenCourseWare(http://ocw.mit.edu/), Massachusetts Institute of Technology. Downloaded on [2 Dec 2009]

LINK ORIGINAL EN LA WEB
https://www.blogger.com/blogger.g?blogID=1078288880652113587#editor/target=post;postID=2934418545071209264

CONFERENCIA SEGURIDAD ELÉCTRICA EN CENTROS QUIRÚRGICOS Y SALAS DE OPERACIONES -FACULTAD DE INGENIERIA ELÉCTRICA Y ELECTRÓNICA DE LA UNIVERSIDAD NACIONAL MAYOR DE SAN MARCOS

PES UNMSM 
Buenas noches con todos compañeros, nuestros amigos del Capitulo Estudiantil EMB-UNMSM de la Escuela de Electrónica, Invita a todos los interesados en la Especialidad Biomedica a participar de esta tarde de conferencias. LUGAR: Auditorio del Pabellón A (Puerta 3) DIA: Miércoles, 21 de septiembre.
 Mas información e inscripciones escribir al correo ieee.emb.unmsm@gmail.com

Evaluation of Wireless Resonant Power Transfer Systems With Human Electromagnetic Exposure Limits Andreas Christ, Mark G. Douglas, Senior Member, IEEE, John M. Roman, Member, IEEE, Emily B. Cooper, Member, IEEE

Abstract—This study provides recommendations for scientifi- cally sound methods of evaluating compliance of wireless power transfer systems with respect to human electromagnetic exposure limits. Methods for both numerical analysis and measurements are discussed. An exposure assessment of a representative wireless power transfer system, under a limited set of operating conditions, is provided in order to estimate the maximum SAR levels. The system operates at low MHz frequencies and it achieves power transfer via near field coupling between two resonant coils located within a few meters of each other. Numerical modeling of the system next to each of four high-resolution anatomical models shows that the local and whole-body SAR limits are generally reached when the transmit coil currents are 0.5 ARMS – 1.2 ARMS at 8 MHz for the maximal-exposure orientation of the coil and 10-mm distance to the body. For the same coil configurations, the exposure can vary by more than 3 dB for different human models. A simplified experimental setup for the exposure evaluation of wireless power transfer systems is also described.

LINK
http://sensor.cs.washington.edu/pubs/power/magnetic_resonance_human_em_exposure.pdf

IEEE POWER ELECTRONICS MAGAZINE JUNE 2016

LINK
http://online.qmags.com/PEL0616/default.aspx?sessionID=45F3504DBF037884B24E7B7DC&cid=3366818&eid=19917&pg=20&mode=2#pg1&mode2

LINK FULL MAGAZINE FORMAT PDF
http://www.mediafire.com/download/cy23ugi7sx5flub/PEL_20160601_Jun_2016.pdf

Conversor CC-CC tipo T ZVS PWM: análise, projeto e implementação Autor:Bandeira Junior, Delvanei Gomes -Universidade Federal de Santa Catarina, Centro Tecnológico, Programa de Pós-Graduação em Engenharia Elétrica, Florianópolis, 2014 BRASIL.

Conversor CC-CC tipo T ZVS PWM: análise, projeto e implementação Autor: Bandeira Junior, Delvanei Gomes Dissertação (mestrado) - Universidade Federal de Santa Catarina, Centro Tecnológico, Programa de Pós-Graduação em Engenharia Elétrica, Florianópolis, 2014.

 LINK ORIGINAL DA DISSERTAÇÃO DE MESTRADO https://repositorio.ufsc.br/handle/123456789/128980

 LINK DIRECTO ARQUIVO PDF 
https://repositorio.ufsc.br/bitstream/handle/123456789/128980/328199.pdf?sequence=1&isAllowed=y

 Abstract : This work presents the analysis of the T-Type Zero Voltage Switching Pulse Width Modulated isolated DC-DC converter (TT-ZVS-PWM Converter). The topology is composed of four switches. Two of them are subjected to the input voltage level and the other two to half the input voltage. All primary side switches commutate under zero-voltage. The proposed converter has the following in common with the Full Bridge Zero-Voltage Switching (FB-ZVS-PWM) and the Three-Level Zero-Voltage Switching (TL-ZVS-PWM) converters: (a) symmetrical operation of the isolation transformer, (b) modulation by pulse-width with constant frequency, (c) zero voltage switching, and (d) three-level voltage applied to the primary winding of the transformer. Theoreticalanalysis, small signal model, design example and experimental results for a 3 kW, 400 VDC input, 60 VDC output, and 50 kHz switching frequency laboratory prototype, are included. Measured efficiency was 93% at full load and a peak efficiency of 95.2% occured at 1.2 kW.

 RESUMO Este trabalho apresenta o estudo de um conversor CC-CC isolado com comutação suave, saída em corrente, para aplicações envolvendo altas potências, com nome T-Type Zero Voltage Switching Pulse Width Modulated dc-dc converter(TT-ZVS-PWM). O conversor a ser estudado possui quatro interruptores. Dois deles são submetidos à tensão de entrada, já os outros dois são submetidos à metade da tensão de entrada. Todos os interruptores comutam sob tensão nula. O conversor proposto possui as seguintes semelhanças com os conversores Full Bridge Zero Voltage Switching(FB-ZVS-PWM) e Three Level Zero Voltage Switching(TL-ZVS-PWM): (a) Operação simétrica (b) Modulação por largura de pulso com frequência constante (c) comutação sob tensão nula e (d) tensão de saída do conversor com três níveis, a ser aplicada nos terminais do primário do transformador. O trabalho é dividido em análise teórica, análise do modelo de pequenos sinais do conversor e roteiro para projeto do conversor. Um protótipo com 3 kW, 400 V de entrada, 60V de saída e frequência de comutação de 50 kHz comprova a análise desenvolvida. A eficiência obtida no protótipo foi de 93% para carga nominal e de 95,2% para 1,2 kW