scholarly journals A Wind Powered, White LED Lighting System for the Kibera Slum of Nairobi

2007 ◽  
Vol 2 (1) ◽  
Author(s):  
Brian Thomas
Keyword(s):  
Service Learning ◽  
Transmission Lines ◽  
Alternative Energy ◽  
Engineering Students ◽  
Low Voltage ◽  
Community Organization ◽  
Light Emitting Diode ◽  
Circuit Breaker ◽  
Governmental Organization ◽  
Light Emitting

A multidisciplinary team of engineering students traveled to Nairobi, Kenya in May 2006 to implement a service learning project between academic sessions. Low power, white light emitting diode (WLED) based lighting devices were designed and built by student participants and members of the student organization Engineers with a Mission during the months preceding the trip. Photometric performance and power consumption data are given for these devices, which were subsequently installed in seventeen homes in the large and infamous Kibera slum. A locally manufactured, technologically appropriate wind generator was purchased and installed to charge a single, centrally located deep cycle battery. Power from this battery was distributed to the LED-based lights through a student designed and built circuit breaker panel and a radial network of indoor/outdoor extension cords that served as low voltage transmission lines. The project provided a learning environment for alternative energy techniques, appropriate technologies, global and multicultural awareness, poverty apprehension, the realities of project implementation, and the social responsibility of those in the engineering profession. A network of Kenyan organizations consisting of a university, a non-governmental organization, a small business, and a community organization, was formed to facilitate sustainability and provide ongoing analysis and maintenance.

High-efficiency, low-voltage phosphorescent organic light-emitting diode devices with mixed host

2008 ◽  
Vol 104 (9) ◽  
pp. 094501 ◽  
Author(s):  
Marina E. Kondakova ◽  
Thomas D. Pawlik ◽  
Ralph H. Young ◽  
David J. Giesen ◽  
Denis Y. Kondakov ◽  
...  
Keyword(s):  
High Efficiency ◽  
Low Voltage ◽  
Light Emitting Diode ◽  
Light Emitting ◽  
Organic Light Emitting Diode ◽  
Organic Light

scholarly journals Electrical TCAD Study of the Low-Voltage Avalanche-Mode Superjunction LED

2021 ◽  
Author(s):  
Raymond Hueting ◽  
Satadal Dutta ◽  
Hidde de Vries ◽  
Anne-Johan Annema
Keyword(s):  
Optical Interconnects ◽  
Low Voltage ◽  
Light Emitting Diode ◽  
Reducing Power ◽  
Constant Field ◽  
Uniform Field ◽  
Charge Balance ◽  
Light Emitting ◽  
Balance Condition ◽  
Tcad Simulation

The CMOS silicon avalanche-mode light-emitting diode (AMLED) has emerged as a potential light source for monolithic optical interconnects. Earlier we presented a superjunction light-emitting diode (SJLED) that offers a higher electroluminescent intensity compared to a conventional AMLED because of its more uniform field distribution. However, for reducing power consumption low-voltage (< 15V) SJLEDs are desired, not explored before. In this work we present a TCAD simulation feasibility study of the low-voltage SJLED for various doping concentrations and device dimensions. The results show that for obtaining a constant field, approximately a ten-fold more aggressive charge balance condition in the SJLED is estimated than traditionally reported. This is important for establishing a guideline to realize optimized RESURF and SJLEDs in the ever-shrinking advanced CMOS nodes.

scholarly journals Analysis of the Electrical Quantities Measured by Revenue Meters Under Different Voltage Distortions and the Influences on the Electrical Energy Billing

Energies ◽  
2019 ◽  
Vol 12 (24) ◽  
pp. 4757 ◽  
Author(s):  
Roberto Perillo Barbosa da Silva ◽  
Rodolfo Quadros ◽  
Hamid Reza Shaker ◽  
Luiz Carlos Pereira da Silva
Keyword(s):  
Low Voltage ◽  
Light Emitting Diode ◽  
Electrical Energy ◽  
Reference Case ◽  
Light Emitting ◽  
Voltage Distortion ◽  
Ac Power ◽  
Energy Billing ◽  
Compact Fluorescent Lamp ◽  
The Impact

This paper evaluates the impact of voltage distortion on the electrical quantities measured by revenue meters and the influences on the electrical energy billing. This is done through an experimental setup, which combines the following variables for the first time in an experiment: different total harmonic voltage distortion (THDv) levels; among these levels, different harmonic profiles; and different loads. A programmable alternating current (AC) power source was used in the laboratory to apply voltage signals in three electronic loads: a compact fluorescent lamp (CFL) and two light emitting diode (LED) lighting devices for which voltage signals with THDv 4.9%, 18.8% and 24.5% have been applied. All applied signals contain one or more harmonic order more commonly found in the low voltage grid (3rd, 5th and 7th). For these analyses, a power quality analyzer and a revenue meter were used. The results show that significant and diverse effects on the electrical quantities of individual loads will occur with different THDv levels and harmonic profiles. Comparing with a reference case (sinusoidal condition), when a distorted signal was applied, for the same THDv level, some parameters remained numerically the same, some have improved and some have become worse. This study shows that the effects of combination of the variables such as different THDv level with different harmonic profiles on electrical quantities of loads are not as clear as the effects of considering only one variable. The results of this paper shed light on such effects.

scholarly journals РАВНОМЕРНОСТЬ ОСВЕЩЕНИЯ В ПТИЧНИКЕ ПРИ НИЗКОВОЛЬТНОМ ЭЛЕКТРОПИТАНИИ СВЕТОДИОДНЫХ СВЕТИЛЬНИКОВ Гладин Д.В., Кавтарашвили А.Ш.

2021 ◽  
Vol 70 (2) ◽  
Keyword(s):  
Power Supply ◽  
Low Voltage ◽  
Light Emitting Diode ◽  
Scientific Center ◽  
Poultry House ◽  
Light Emitting ◽  
Operating Current ◽  
Lighting Systems ◽  
Academy Of Sciences ◽  
Physical Principles

КЛЮЧЕВЫЕ СЛОВА: НИЗКОВОЛЬТНЫЕ СВЕТОДИОДНЫЕ СВЕТИЛЬНИКИ, СТАБИЛИЗАЦИЯ РАБОЧЕГО ТОКА И СВЕТОВОГО ПОТОКА, РАЗМЕРЫ ПТИЧНИКОВ, РАВНОМЕРНОСТЬ ОСВЕЩЕННОСТИ ПТИЧНИКОВ АННОТАЦИЯ: Изучены физические принципы и технические основы современной организации низковольтного светодиодного освещения в птичниках. Рассмотрены технические решения обеспечения равномерности освещения в птичнике за счет сохранения одинакового светового потока низковольтных светодиодных светильников при их различной удаленности от источников питания. THE UNIFORMITY OF LIGHTING WITHIN A POULTRY HOUSE WITH LOW-VOLTAGE POWER SUPPLY OF LED LAMPS GLADIN D.V.1, KAVTARASHVILI A.SH.2 1 TECHNOSVET GROUP, Ltd 2 Federal Scientific Center “All-Russian Research and Technological Institute of Poultry” of Russian Academy of Sciences The physical principles and technical design of modern LED lighting systems with low-voltage power supply for poultry houses are summarized. The technical decisions providing the uniformity of lighting within a poultry house are described involving the maintenance of uniform luminous power of low-voltage LED lamps mounted at different distances from the power source. Keywords: LOW-VOLTAGE LIGHT-EMITTING DIODE (LED) LAMPS, STABILIZATION OF OPERATING CURRENT AND LUMINOUS POWER, SIZE OF POULTRY HOUSE, UNIFORMITY OF LIGHTING WITHIN POULTRY HOUSE

scholarly journals Electrical TCAD Study of the Low-Voltage Avalanche-Mode Superjunction LED

2021 ◽  
Author(s):  
Raymond Hueting ◽  
Satadal Dutta ◽  
Hidde de Vries ◽  
Anne-Johan Annema
Keyword(s):  
Optical Interconnects ◽  
Low Voltage ◽  
Light Emitting Diode ◽  
Reducing Power ◽  
Constant Field ◽  
Uniform Field ◽  
Charge Balance ◽  
Light Emitting ◽  
Balance Condition ◽  
Tcad Simulation

The CMOS silicon avalanche-mode light-emitting diode (AMLED) has emerged as a potential light source for monolithic optical interconnects. Earlier we presented a superjunction light-emitting diode (SJLED) that offers a higher electroluminescent intensity compared to a conventional AMLED because of its more uniform field distribution. However, for reducing power consumption low-voltage (< 15V) SJLEDs are desired, not explored before. In this work we present a TCAD simulation feasibility study of the low-voltage SJLED for various doping concentrations and device dimensions. The results show that for obtaining a constant field, approximately a ten-fold more aggressive charge balance condition in the SJLED is estimated than traditionally reported. This is important for establishing a guideline to realize optimized RESURF and SJLEDs in the ever-shrinking advanced CMOS nodes.

scholarly journals On the reduction of the third-order harmonic losses in low–voltage power cables used for feeding large LED and CFL lighting loads

2017 ◽  
Vol 6 (3) ◽  
pp. 46 ◽  
Author(s):  
N. J. Milardovich ◽  
L. Prevosto ◽  
M. Á. Lara ◽  
D. Milardovich
Keyword(s):  
Low Voltage ◽  
Light Emitting Diode ◽  
Strong Increase ◽  
Power Losses ◽  
Third Order ◽  
Light Emitting ◽  
The Third ◽  
Fluorescent Lamps ◽  
Harmonic Currents ◽  
Lighting Loads

An experimental investigation of diversity factors of CFL (compact fluorescent lamps) in combination with LED (light emitting diode) lamps is presented in this paper. Attention was paid to the reduction of low–order harmonic currents, especially the third one; which is mainly responsible for the strong increase in power losses in the neutral conductor of low–voltage installations. The harmonic currents drawn by several LED and CFL lamps with nominal powers < 25 W were first measured to investigate the electrical characteristics of individual lamps. In addition, a series of experiments was conducted in which LED lamps were powered between lines through small autotransformers thus avoiding the use of the neutral conductor. The results showed in both cases a sensible reduction of the harmonic current of third order and therefore a marked reduction of the power losses associated with them.

Low-voltage polariton electroluminescence from an ultrastrongly coupled organic light-emitting diode

2014 ◽  
Vol 104 (23) ◽  
pp. 233302 ◽  
Author(s):  
Christopher R. Gubbin ◽  
Stefan A. Maier ◽  
Stéphane Kéna-Cohen
Keyword(s):  
Low Voltage ◽  
Light Emitting Diode ◽  
Light Emitting ◽  
Organic Light Emitting Diode ◽  
Organic Light
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