Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 34 for “"LED Lighting"”.
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Learning About LED Lighting Technology Through Patents
… <p>By providing the basic building blocks of LED lighting technology as learned through the teachings of patents and patent applications, this thesis proves that patents and patent applications are valuable resources for learning about technology. The patents and patent applications relied …
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Incorporating Wireless Power Transfer in an LED Lighting Application
<p>There are various situations in which electrical energy is desired but cannot by conveniently supplied. Since the days of Hienrich Hertz and Nikola Tesla, scientists have tried to solve this problem using different methods of wireless power transfer. Today, wireless power transfer has only been …
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A merged two-stage converter for LED lighting applications
Light Emitting Diodes (LEDs) are a very promising technology for developing more efficient lighting. For high-efficiency applications, a switching current regulator is necessary to control the power drawn by an LED string. This thesis investigates a merged two-stage LED driver for lighting …
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AC Direct Drive LED Lighting Using Low Cost Analog Components
… rapidly expanding area of AC direct drive for LED lighting. AC LED driving does not use typical DC-DC converter-based driving but uses semiconductor switches and a linear regulator to activate a number of LEDs proportional to the input voltage at any given time. This allows bulky, expensive …
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Comparing LED Lighting Systems in the Detection and Color Recognition of Roadway Objects
This study compared two LED luminaires and their abilities to provide detection distance and color recognition distance of potential roadway hazard. Detection distance is regarded as a metric of visibility. Color recognition distance is a metric for comparing the impact of the (Correlated Color …
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Single-stage boost integrated asymmetrical half-bridge AC-DC power converter with dual modulation for indoor led lighting
Light emitting diodes (LEDs) for indoor lighting is a promising technology which can lead to major energy saving and cost reductions. The major concerns of improving power factor and regulating the output current ripple with regards to LED drivers has been addressed in this thesis by using dual …
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Use of SIMO Converstion for Optimizing LED Light Drivers
… tremendous cost pressures are pushing the LED lighting market away from traditional power electronics converters and towards solutions that are more unconventional. Lower quality LED lights use simple low-cost converters, whereas high end product may add complexity in order to achieve a …
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Natural Rhythms and Temporal Perception - Visualization of Sunlight Patterns with Energy Monitoring
… combine Photovoltaic-integrated glazing with LED lighting to create conditions that stimulate the occupants while connecting inside to out. To reestablish a connection to natural rhythms the BIPV energy monitoring is used during the day to record variations in solar radiation which at night …
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Seeing the light: germination, growth and flowering responses in wildflowers under artificial nighttime lighting
The introduction of artificial nighttime lighting due to human settlements and transport networks is increasingly altering the timing, intensity and spectra of natural light regimes worldwide. Artificial light at night (ALAN) is predicted to constitute a significant anthropogenic pressure on …
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Prognostics and health management of light emitting diodes
… systems and products. Light Emitting Diodes (LEDs) are optoelectronic micro-devices that are now replacing traditional incandescent and fluorescent lighting, as they have many advantages including higher reliability, greater energy efficiency, long life time and faster switching speed. Even …
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Modeling and Control of Single Switch Bridgeless SEPIC PFC Converter
… an important issue in light-emitting diode (LED) lighting applications. A boost converter is one of the most well-known PFC topologies, due to its simple circuitry, simple control scheme and small number of passive components. Even though a boost converter is recognized as a typical PFC …
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Multi-Channel Constant Current (MC3) LED Driver for Indoor LED Luminaries
Recently, as a promising lighting source, light-emitting diodes (LEDs) have become more and more attractive and have great opportunity to replace traditional lighting sources - incandescent, fluorescent and HID because of the advantages such as high luminous efficacy, long lifetime, quick on/off …
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The Design and Manufacture of a Light Emitting Diode Package for General Lighting
Lighting technologies have evolved over the years to become higher quality, more efficient sources of light. LEDs are poised to become the market standard for general lighting because they are the most power efficient form of lighting and do not contain hazardous materials. Unfortunately, LEDs pose …
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Beyond the surface an investigation into the narrative aspects of tattoos
… hidden. Once made visible with the back LED lighting, the two hidden images are juxtaposed on the canvas to show a personal interpretation, a recreation of the original tattoo and the true meaning behind it. This approach looks to create a physical artistic representation of this …
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Supercapacitor assisted LED (SCALED) converter technique for solar powered DC-microgrids
… or DC-AC converters to supply motors controlled by variable speed drives. The overall efficiency of an electronic device with multiple voltage converters is determined by the product of the efficiencies of the individual conversion stages. Thus, overall efficiency drops drastically with the …
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High Efficiency SEPIC Converter For High Brightness Light Emitting Diodes (LEDs) System
… of and driving methods for light emitting diode (LED) lamp system. A comprehensive overview on the lighting development is proposed. The characteristic of the light emitting diode (LED) lamp is described and the requirements of the ballast for the light emitting diode (LED) lamp are presented. …
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BASIC AND APPLIED RESEARCH APPROACHES FOR OPTIMIZING THE USE OF ARTIFICIAL LIGHT IN VEGETABLE CROPS
Light-emitting diode (LED) lights are a desirable alternative to outdated lighting systems due to their numerous benefits, including programmability and efficiency in energy consumption. But before switching from traditional broad-waveband lighting systems to narrow-wavelength LED lighting, there …
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Development of Iii-Nitride Non-Polar Leds and Self-Aligned Laser Structure
<p>Light Emitting Diodes (LEDs) are finding numerous applications in several commercial systems because they have unique properties. LEDs are more energy efficient, robust, small in size, very reliable and are sustainable in hazardous environmental conditions making them a good substitute for …
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