LED the development of green lighting system at home and abroad

Introduction

leds in nearly a decade in the performance and quality improved 10 times, and the manufacturing cost decreased to 1/10 of the early. LED in recent 10 years, new breakthroughs, like Edison invented incandescent lamp in 1879 become the milestone of civilization, exciting. With energy saving, environmental protection, safety, long service life, low consumption, low heat, light, white light, shockproof, waterproof, miniature, high brightness, easy to move light beam and the advantages of concentration and reduce maintenance 15 LED a new generation of green light source, will be in the 21st century caused a revolution in the field of global illumination. We just need to wait and see. Here is a simple introduce LED development situation at home and abroad.

1 new progress of technology and application of LED products abroad

a new generation of green light LED infinite future and huge in and potential market has been recognized by the public, become indisputable facts and highlighting the battlefield, it is with great enthusiasm into the LED lighting products research and development, production and application. In recent one or two years, Philips LumiLEDs, Osram, Nichia and Gree company on high power white LED research and development have made new progress and an extraordinary performance. Philips LumiLEDs said its size is 1 mm * 1 mm LED chips in 350 ma of luminous efficiency of electric shed 115 lm/W. In early 2008, Gree company to sell in the market of 1 W white LED, its luminous efficiency reach 118 lm/W. It is reported that 2007 high-power white LED industrialization level, photosynthetic efficiency reached 60 ~ 90 lm/W, lifetime of 50000 h. Due to the ascension of LED lights and power, the foreign traffic lights have begun to use 8 ~ 10 high-power leds to replace previous dozens or even hundreds of small power LED, and the effect is better.

Osram announced that their research and development of white LED brightness and photosynthetic efficiency both create a record high. Allegedly, ma work electricity flow in 350, the peak intensity reach 155 lm, photosynthetic efficiency is 136 lm/W, color temperature is 5000 k, color coordinates to 0. 349/0. 393 ( cx/cy) 。

as LED, the improvement of the performance of the new type of LED lamps and lanterns has made some new progress. At present single chip is used as lighting white LED batch production of products mainly include 1 w, 3 w and 5 w, current capacity 350 ma and 700 ma, 1 a and 1. 5 a and so on several; More chip packages together LED power from 10 w, 30 w, 20 w and has increased to 100 w and 100 w above. As shown in figure 1 for home samples of LED lamp.

MR16 lamp use 12 v AC/DC power supply, drive IC USES the PT4115, system circuit shown in figure 2, figure 3 shows for MR16 LED lamp and constant current source circuit board material. Based on the LED driver circuit PT4115, can light up a 3 w leds or 3 of the 1 w leds.

editor: li jie