1. Analysis of industry development status The LED application market is in a period of rapid development. The user recognition brought by high-quality experience and the promotion of government policies have made more and more people pay attention to the LED industry. Because the upstream chip, packaging and other links of the industry are relatively high-end and are restricted by equipment and raw materials, many manufacturers choose to cut in from the LED drive link, especially the previous manufacturers engaged in the development of switching power supply products, almost all of them have moved into the field of LED drive technology . Research organization iSuppli predicts that between 2009 and 2013, China's LED drivers will grow at a compound annual growth rate of 4.4%, of which the annual growth rate in 2010 reached 9.6%, and the scale reached 127.7 million US dollars. It is expected that the Chinese LED market will reach 1.39 in 2013 One hundred million U.S. dollars. As far as LED lighting drive technology is concerned, the original switching power supply technology is mostly used in the power supply. The LED drivers on the market are basically switching power supplies that have been matured before. If it is an IC based on voltage control, a constant current peripheral circuit can be added. Therefore, as far as the LED drive power supply is concerned, the products of each company are based on mature switching power supply technology, and there is not much difference. If you want to break through, you need to work hard on the drive control link. Among them, dimming technology is used as LED lighting. Drive control technology has promising technology and is generally optimistic. Dimming is a major trend in the development of LED lighting drive technology. At present, many power supply manufacturers have begun to take aim at the big cake of dimming power supply, and have launched their own dimmable power supply products. However, because there is no unified standard for LED dimmers, there is a problem that the dimming power supply cannot be matched with the dimmer. During application, problems such as light flickering, not wide dimming range, uneven dimming, and poor adaptability will occur. Although some of these problems are caused by dimmers, they can also be improved from the dimming power supply. 2. Project Introduction The company plans to develop a dimming power supply compatible with front-end dimming and trailing-edge dimming. It can provide a wide and stable flicker-free dimming range, and it fully complies with the energy star power specification requirements for typical applications. This dimming power supply can actually connect LED lights to replace those incandescent or halogen lamps equipped with thyristor dimmers, without any changes, maintain the original dimming performance and ensure smooth and stable brightness during adjustment. There is no stroboscopic phenomenon. Not only can it support a dimming ratio of up to 100:1, but it can also output a constant current above 1A to drive multiple strings of LEDs. It can be widely used in MR16, GU10, PAR lamps and other LED lamps. The use of the dimming power supply can also effectively extend the service life of the LED and reduce energy consumption. The innovation of the project is to use active PFC technology to correct the power factor so that the power factor is greater than 0.9. It can increase the energy usage rate of LED lamps, reduce electricity bills, and effectively reduce the harmonics that cause power pollution, which is a beneficial function to the power grid. Main technical indicators: 80V~280VAC wide voltage input power factor>0.9 dimming range 0~100% efficiency greater than 80% current constant current accuracy ±10% adopts isolation technology design to meet the requirements of various safety standards. Economic indicator expectations: Although LED lighting accounts for a small proportion of the overall lighting market output value, estimated to be 3.2% in 2010, but LED lighting has become one of the main development policies in many countries. Under the impetus of national policies, the output value of LED lighting will increase rapidly. Incandescent lamps will be banned worldwide in 2012 and will be replaced by energy-saving lamps and LED lamps. Although energy-saving bulbs are inexpensive and have high luminous efficiency, they contain mercury and use a large amount of glass, which is not in line with the purpose of environmental protection. LED lighting has the advantages of being more environmentally friendly than energy-saving bulbs and not emitting ultraviolet rays, but the current price is relatively high. Therefore, LED lighting needs to provide a dimming function that energy-saving bulbs lack, in order to quickly gain a major position in this wave of incandescent lamp replacement trends. Relevant research institutions predict that LED bulb shipments will grow significantly after 2012, and the output value is estimated to be as high as about 8 billion US dollars. In terms of output value, the penetration rate of the global LED lighting market in 2011 will exceed 10%. In 2011, the global LED bulbs Sales will reach 600 million pieces; in 2013, as the 40W and 60W traditional bulbs are phased out, the LED bulb market is estimated to reach 2.5 billion pieces, and the LED lighting output value penetration rate will further increase to nearly 20%. We expect that dimmable LED bulbs will account for more than 80% of all LED bulbs in the future. The reason is that whether or not LED lighting products have dimming functions has little difference in cost. Therefore, more manufacturers will add dimming functions to their products in the future. , The industry is quite optimistic about the development prospects of dimmable LEDs. The above is the LED dimmable drive power research and development plan summarized by the LED street lamp manufacturer