Design And Construction Rechargeable Lamp Using LED With Charging Monitoring And Controlling System.
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7,367 Words
Nowadays, because of low energy or power consumption, low heat emission, low cost, the portability, wider application, LED bulbs are highly used than florescent lamp when building lantern. This work is on LED lantern with dual power supply which uses an AC source to power the lamp when there is mains power supply and also use a rechargeable battery which is charged with mains source which is to be used during power outage using LEDs a […]
The usage of light-emitting diodes (LEDs) in automotive applications is increasing for the same reasons that LED lighting is penetrating non-automotive sectors. LEDs are more efficient and smaller in size, have a substantially longer life, allow considerably greater design freedom for improved aesthetics, and more. While the basic operating requirement for an LED driver is to supply a constant current to LEDs in order to produce consi […]
ABSTRACT This project (Construction of an adjustable LED flasher) was constructed using available materials. Flashing circuits are very interesting. They grab your attention and can be used in many applications. They consume very little energy and a single cell can last as long as 12 months. You can flash globes, LEDs and pulse all types of devices such as motors, solenoids and piezo diaphragms. In this discussion we will cover a numb […]
ABSTRACT This LED based reading lamp circuit uses ultra-bright white LEDs to provide sufficient light for reading while consuming approximately 3 watts of power. In the case of AC mains failure, the battery backup circuit instantly lights up the LEDs. When the power resumes, the battery supply is automatically disconnected and the lamp circuit again works off AC mains. The power supply circuit consists of 0-7.5V, 500mA step-down trans […]
ABSTRACT Standard fluorescent lamps and their smaller versions called compact fluorescent lamps (CFLs) radiate light in all directions (360°) and tend to increase the room temperature. In emergency lights using these lamps, the battery lasts only a few hours due to the power loss during conversion of DC into AC. These limitations can be overcome by using ultra-bright white LEDs. Here is a multipurpose lamp using white LEDs that can al […]
ABSTRACT An emergency light is a battery-backed LED lighting device that switches on automatically when a building experiences a power outage. Emergency lights are standard in new commercial and high occupancy residential buildings, such as college dormitories. Most building codes require that they be installed in older buildings as well. It is powered by a NiCad battery that is being charged by the main power line when there is no bl […]
CHAPTER ONE INTRODUCTION 1.0 PROJECT OVERVIEW An energy saver LED bulb is a light-emitting diode (LED) product that is assembled into a lamp (or light bulb) for use in lighting fixtures. LED lamps have a lifespan and electrical efficiency which are several times greater than incandescent lamps, and are significantly more efficient than most fluorescent lamps,[1][2][3] with some chips able to emit […]