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Solid-state LED lighting situation is getting brighter, and its applications continue to expand worldwide, including indoor and outdoor lighting, automotive interior, TV and monitors, cell phones and other consumer electronics products, backlight, and even car headlights.
According to market research firm Strategies Unlimited in the LED market research director Ella Shum, last year's global sales of packaged high-brightness LED surge 93%, to 10.8 billion U.S. dollars. Its growth mainly from TV and monitors, and mobile devices backlight.
Shum noted that despite the current global solid-state LED lights source used for the lighting is very interested, but high-brightness LED market in total sales last year accounted for only 8%. But she expects 2010 to high-brightness LED illumination-2015 areas will be an increase of 39% or so.
ElectroniCast Consultants recently released market research report that the United States last year consumed 485 million the value of LED bulbs. The company forecasts that number in 2015 will reach 1.64 billion (Figure 1).
The company forecasts that number in 2015 will reach 1.64 billion (Figure 1)
LED lightings, the long and short
LED light source than other types of more popular, because not a mystery. According to the U.S. Department of Energy's solid-state lighting research and development program, and high-intensity gas discharge (HID) light bulbs, fluorescent tubes and energy saving lamps (CFL), compared to halogen and incandescent lamps, LED has higher performance and longer life .
A cool white LED's maximum performance is 132 lm / W (l / W), while only a few incandescent 15 lm / W, both the life expectancy of 5 million and a thousand hours. The power LED lighting is used in 20% of incandescent lamps - that have growing importance in the world today is a very important energy conservation benefits.
However, higher prices of its shortcomings. Philips AmbientLED A19 lamp replacement costs about 40 dollars, while incandescent lamps not more than 1 dollar. LED energy-saving advantages of the long-ordered and can compensate for this shortcoming. Next year, the cost of the two will narrow the gap to the current quarter.

U.S. Department of Energy estimates that if all people use solid-state lighting, then by 2020, the electricity savings to meet the 32 million families. LED energy savings have been equivalent to 25 million households with electricity.

In addition, LED output level has reached 150 lm / W, and continues to rise. Several manufacturers of high brightness LED LED, can provide a wide range of lighting colors. For example, Cree LR6 downlight produced using a patented color mixing method, the comparable incandescent light emitted, but 85% less power than incandescent, but life is it 50 times (Figure 2) .
Energy-saving products as an alternative to incandescent lamps, LED bulbs continue to improve performance levels, and lower prices. For example, LEDtronics PAR Series LED energy than incandescent light bulbs 90% (Figure 3).
he 120V AC LED bulbs can also be in the range 90-290V AC dimmer, the use of medium Edison screw lampholders and G824-pin plug-type light bulbs, including the PAR20 (7-W), 30 (12-W) and 38 (15-W) of various types. EER said to the older generation of these products is 20% higher LEDtronics PAR lamp can directly replace the power up to 100W of incandescent and halogen lamps.

LED light bulbs cost of acquisition in the total cost of ownership is a factor, which not only lower energy costs, but also lower maintenance and replacement costs. Sandia National Laboratories estimated that today's incandescent light bulb LED lighting is twice the lifetime cost of ownership, is a fluorescent lamp 10 times the cost of ownership. But the lab also predicts that by 2020, LED lighting, cost of ownership is one of the incandescent lamp 10, is a fluorescent lamp half.

Each of the companies and organizations want to save in energy costs above the tens of thousands of dollars, which is to promote the way to the LED lighting changes the main force. Many shopping malls, shops, offices and building internal and external decoration, are turning to LED. Bridges, tunnels, highways, streets, parking lots, and airports also have adopted the stage LED lighting.

Engaged in the design, development, manufacture and sales of high-efficiency LED solution Lighting Science Group reported that in these places are busy installing their high performance and high efficiency lamps, such as Definity MR16 system. Simon Property Group shopping malls in the booth, the lights are being used to replace original halogen lamp. The company said its fully adjustable light Definity products, 80% higher efficiency than halogen light output than many other light sources is 50%.

LED designers and users face a challenge, the light source and there is no standardization of the interface between the drive circuit. Zhaga European Union launched an industry-wide action to develop standards for the LED light engine specifications. LED light engine is the interface with the provisions of the LED module, which interfaces with the internal use of the LED light engine technology type.

Zhaga will enable products from different manufacturers which have interchangeable. By the definition of the interface of various special optical engine, you can achieve interchangeability. Zhaga standard will cover physical size, and the LED light engine optical, electrical and thermal performance.

Driver Design Optimization

LED driver is a complex task. This is because the LED lighting application may change. Efficiency and color accuracy and other performance parameters will be greatly influenced LED drive. TI lighting power products marketing director Peter DiMaso strategy explains: "LED drive can affect the performance, color temperature and color shift (caused by the heat) and the flicker effect."

Texas Instruments C2000 micro-controller unit (MCU), director of marketing Patrick Carner agree with this view. He also pointed out that TI claims that its Piccolo MCU can be used for LED driver solution that allows designers to "further the use of digital power control hardware and software." The company's C2000 dc-dc LED lamp show developer tools, drive one or more shared power needed most appropriate power supply topologies (Figure 4).