The current development of China's LED lighting
The current circumstances, subject to the enhancement of luminescence efficiency of the upstream chip prices fell and the LED Blue 150W apparatus, a growing emphasis on the development of LED lighting in the area, and the LED industry is also showing a very good development trend. Experts predict that the share of the domestic lighting market, LED 2010 market share of less than five percent, but the LED lighting market share in 2011 is expected to double, reaching more than 10%, and within two years. With scientific and technological development and innovation, LED technology is more mature, its market share is at least able to reach the fifth. LED lighting in the development process, construction night lighting is undoubtedly one of the main direction of development. Whole the price of LED lighting products in the short term downward trend.
Our government as well as provincial and municipal enterprises attach great importance to the development of LED lighting, 2010, the majority of domestic enterprises invest heavily in the areas of production of LED chip, LED chip price is not expensive if the daughter, but gradually reduced the price, especially in lighting applications highpowerLED price declines has reached about 15-20%. It is worth mentioning is that in the coming years, China plans to increase to more than 1200 LED devices by MOCVD. Capital investment and state support to improve the production of chips, at the same time greatly contributed to the cost of domestic LED lighting products, the decline in prices.
In addition, technological advances also contributed to the LED 400W chip prices lower one of the reasons. According to reports, the U.S. Department of Energy set the LED point of view, the 2010 target is 140lm / W, 2020, LED luminous efficiency will reach 243lm / W.
LED lighting products and LED intelligent lighting control system
LED (Light Emitting Diode Light Emitting Diode) light-emitting materials, solid semiconductor chip, and both ends of the semiconductor chip with a positive voltage, the carrier in the semiconductor compound to produce the energy to emit visible light, incandescent lighting The perfect alternative to upgrade products. It has the following characteristics: 1, safe and reliable. The semiconductor light-emitting diode, light color and soft, no glare, UV radiation generated. To save energy. The LED and light-emitting diodes within the photon reflex movement, does not produce excess heat, high energy conversion efficiency, the same brightness, power consumption is only 1/10 of an ordinary incandescent lamp, energy-saving rate up to 90%. 3, long service life. LED Power Supply are incandescent lamp life of 100 times, with more than 100,000 hours average life, and can work in the high frequent startup or shutdown state without damage.
LED architectural lighting intelligent control system, the main structure, including the sensor unit, control unit, drive circuits, lighting systems and other parts, night lighting of the city building to provide a convenient and effective to save the human and material resources, to avoid the waste of resources.
Here the author described a high power led intelligent lighting and constant current drive control system.
First introduced the system hardware design, shown in Figure 1, the intelligent lighting control system based on μPD78F0034-based controller design is mainly composed by four parts of the sensor unit, controller unit, the LED drive circuit and the lighting system. the μPD78F0034 chip is that computing received by the thermal infrared sensors, light sensors, voice sensors and after A / D conversion of the initial processing of the signal data, signal processing after the D / A converter, the role of the LED driver circuit and display circuit, the help system to work properly.
Second, the system software design. In order to achieve the purpose of simplifying the design structure, the use of modular design-led, as the core set of functional modules subroutine to the main program, subroutine by the main program calls the function module when the system works. Various functional sub-modules carry out their duties, the input module is responsible for three types of sensor signal input SCM data channel in the control system software, the rectifier zoom digital sound sensor signal and the infrared detector signal for the switch Boolean data, environment complement optical rectification amplified signal two routes generated by the light intensity detection system, all the way to a boolean value, and the output after the first two-way signal processing and computing, as a basis for a switching signal lamp switch, the other all the way to environmental data A / D conversion, the encoded output to the output module of the system by the control system adjust the lamp brightness, the appropriate brightness according to ambient changes in LED, and ultimately achieve the purpose of the LED 200W intelligent lighting.
After setting, the system without manual exercise supervision, according to the requirements of different working environments, and the alternation of day and night environment, automatic control switch and brightness of the LED lighting. In particular, high-power LED lighting for night lighting in the city building, we use a constant current source-driven approach, not only can improve electricity efficiency, saving energy, can effectively extend the service life of LED lighting.