Led Driver Circuitry
L prize-winning LED lamp, on sale in 2012. Photo: Image: David Arky • • • • • Last August, the U.S. Department of Energy announced the first winner in its ongoing competition to encourage lighting that’s more efficient—the Bright Tomorrow Lighting Prize,. The DOE awarded US $10 million for coming up with a lamp that’s equivalent to a standard 60-watt incandescent bulb in size and brightness but lasts at least 25 times as long and runs on less than 10 W. Although lamps that are almost as efficient have been available for more than a year, the prizewinning design is just now going on sale.
Like the backlights in modern cellphones and computer monitors, these lamps use light-emitting diodes to generate white light. They offer long lifetimes, pleasing colors, and most important, phenomenal energy efficiency. Is it now time to throw away the incandescent bulbs still lurking in your light fixtures—and even the compact fluorescent lamps (CFLs) you’ve been switching to—and replace them all with LED superlights? With costs often hovering around $25 a pop, few homeowners are rushing to take that plunge.
But prices are dropping, and performance is improving fast. So it’s clear that the day when LED lamps will dominate lighting in both residences and businesses is not far off. Why are LED-based lamps superior, and what makes them so tricky to engineer, anyway?
Automation Book By Groover Pdf on this page. You might imagine that the answers would hinge on They do, but only up to a point. The practicality of these new lights also depends on a more mundane part of the package that’s often overlooked: the circuitry required to drive them. Here I’ll explain what the requirements are for that circuitry and why designing the appropriate electronics can be a challenge, although not one that should slow the adoption of this fantastic new form of lighting. Like it or not, incandescent bulbs are a dying breed. Australia and the European Union started phasing out traditional incandescents in 2009. The United States is haltingly moving in the same direction, and China is aiming to eliminate incandescent bulbs by 2016. The reason is simple: Old-fashioned lightbulbs squander enormous amounts of electricity.
Understanding LED Drivers and How To Choose the Right One. This is needed because the drivers need a 2 volt overhead to power the internal circuitry.
A full 90 percent of the energy you put into an ordinary incandescent bulb goes into making heat, not light. A standard 60-W bulb generates approximately 850 lumens of light, which comes out to about 14 lumens per watt. Acronis True Image 2014 Keygen Download Sony there. (a more sophisticated kind of incandescent with a higher temperature filament) can provide about 20 lm/W.