BIRNS Emergency Light Fixture-LED Seismic Testing

His video shows BIRNS Emergency Light Fixture-LEDs (ELF-LEDs) during IEEE-344 seismic qualification testing at the National Technical Systems facility. This demanding test sequence uses a tri-axial acceleration table delivering the equivalent of a seismic event at 10Gs of force in the x, y and z axes.

BIRNS ELF-LEDs are advanced, seismically qualified nuclear grade lighting systems that provide 24-40 hours of standby illumination in the event of loss of AC power, which is 3 to 5 times longer than required by the NRC. These rugged, CE marked, RoHS compliant systems have a lamp life of 50,000 hours, and an 11 W power draw.

http://www.birns.com/emergency-light-fixture-led.html

PLL FOR SINGLE PHASE GRID CONNECTED INVERTERS Power Electronics Dept., Technical University- Sofia, Bulgaria

PLL FOR SINGLE PHASE GRID CONNECTED INVERTERS
Mihail Antchev1, Ivailo Pandiev, Mariya Petkova, Eltimir Stoimenov, Angelina Tomova,Hristo Antchev
(Power Electronics Dept., Technical University- Sofia, Bulgaria)
(Electronic Engineering Dept., Technical University- Sofia, Bulgaria)
(R&D Sector, Technical University- Sofia, Bulgaria)

FULL PAPER
https://www.mediafire.com/?b7ow33oet047hk3
 

A Comparative Analysis of Multiloop Voltage Regulation Strategies for Single and Three-Phase UPS Systems Poh Chiang Loh, Michael John Newman,

Abstract—Most of the many reported control algorithms for uninterruptible power supplies (UPSs) use either filter inductor or filter capacitor currents as feedback variables to regulate the output voltage. This paper explores the fundamental performance issues associated with the use of these quantities as feedback variables, with a view to determining their contribution to the transient system response and output harmonic compensation in any particular situation. A proportional plus resonant (P+resonant) compensator is then added into the outer voltage regulation loop to achieve zero steady error, to develop a high performance UPS control algorithm, which is applicable to both single-phase and three-phase systems. Theory, simulation, and experimental results are presented in the paper.
FULL PAPER
https://www.mediafire.com/?vjjvhvmmpfmarsa

Annual International Microelectronics Olympiad of Armenia

Synopsys Armenia is the general organizer of the annual Armenian Microelectronics Olympiad, reflecting the growing development of microelectronics design in Armenia. The competition spotlights Armenia’s brightest and most talented young engineers under the age of 30. Goals of the Armenian Microelectronics Olympiad: Stimulate further development of microelectronics in Armenia and in the participant countries Recognize and inspire young, talented engineers Increase interest in microelectronics among young specialists Understand the level of knowledge in the field of microelectronics among young specialists in participating countries in order to make necessary adjustments to educational programs Create a community of young specialists involved in microelectronics The topics of the Olympiad: Digital IC Design and Test Analog and Mixed Signal IC Design and Test Semiconductor Devices and Technology Mathematical and Algorithmic Issues of EDA All participants of the Armenian Microelectronics Olympiad receive participation certificates. OLYMPIAD TESTS AND PROBLEMS EIGHTH ARMENIAN MICROELECTRONICS OLYMPIAD BROCHURE

WEBSITE ORIGINAL
http://www.synopsys.com/Company/Locations/Armenia/EducationalPrograms

/MicroelectronicsOlympiad/Pages/default.aspx#top

LINK DOWNLOAD OLYMPIAD TEST AND PROBLEMS
http://www.synopsys.com/Company/Locations/Armenia/EducationalPrograms/MicroelectronicsOlympiad/Documents/8thOlympiadTestsandProblems.pdf

Dual Mode PWM/Linear BuckConverter by Sensinga Load Current

Dual Mode PWM/Linear BuckConverter by Sensing a Load Current
 Kyung-hwan Kim
Department of Electronics and Electrical Engineering Graduate School Dankook University ABSTRACT
Recently, the importance for power management IC(PMIC) is emphasized as battery-powered portable electronics such as smartphone are commonly used.In addition,research and development on high efficiency isessential to maximize the use of portable devices that are preferred various functions than in the past.PMIC for high efficiency usually change drastically from Linear regulators to Switching regulators. But the switching regulators have disadvantage of low efficiency compared with linear regulatorat light load conditions. Therefore,this paper is presented the using of linear regulator to increase efficiency at light load conditions and the using of switching regulator at heavy load conditions.