introduction
The performance and quality of LEDs has increased tenfold in the last decade, while manufacturing costs have fallen to the early 1/10. The new breakthrough of LED in the past 10 years is as exciting as the milestone of civil society in 1879 when Edison invented the incandescent lamp. LED new generation green light source with energy saving, environmental protection, safety, long life, low consumption, low heat, color light, white light, shockproof, waterproof, miniature, high brightness, easy dimming, beam concentration and reduced maintenance A revolution will be triggered in the global lighting arena in the 21st century. We just have to wait and see. The following is a brief introduction to the development of LEDs at home and abroad.
1 New progress in foreign LED technology and its application products
The future of a new generation of green light source LEDs and the huge potential and potential market have been recognized by the public, becoming an indisputable fact and a battleground for the competition. People are eager to invest in the research and development, production and production of LED lighting products. In the application. In the past year or two, Philips LumiLEDs, Osram, Nichia and Gree have made new progress in the development of high-power white LEDs and have achieved remarkable results. Philips LumiLEDs say that LED chips with a size of 1mm x 1mm have a luminous efficiency of 115lm/W at 350mA. At the beginning of 2008, Gree sold 1W white LEDs on the market with a luminous efficiency of 118lm/W. According to reports, in 2007, the high-power white LED industrialization level, the light efficiency generally reached 60~90lm/W, and the service life reached 50,000h. Due to the improvement of LED light efficiency and power, foreign traffic lights have begun to replace the previous dozens or even hundreds of low-power LEDs with 8~10 high-power LEDs, and the effect is better.
Osram has announced that the brightness and efficacy of the white LEDs they developed have created new heights. It is said that at 350mA operating current, the peak brightness reaches 155lm, the luminous efficiency is 136lm/W, the color temperature is 5000K, and the color coordinate is 0.349/0.393 (cx/cy).
With the improvement of LED performance, new LED lamps have also made some new progress. The single-chip white LEDs currently used for lighting are mainly produced in 1W, 3W and 5W, current capacity is divided into 350mA, 700mA, 1A and 1.5A; multi-chip packaged LED power from 10W, 20W and 30W It has been raised to 100W or even 100W. Figure 1 shows a sample of a household LED lamp.
The MR16 spotlight uses a 12V AC/DC power supply, and the driver IC uses PT4115. The system circuit is shown in Figure 2. Figure 3 shows the MR16 LED spotlight and constant current source circuit board. Based on the PT4115 LED driver circuit, it can illuminate a 3W LED or three 1W LEDs.
Editor: Li Jie
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