Looking forward to LED driver power decomposition LED driver and protection chip

First, the current situation of the use of LED drive power

Standard lights are undergoing a revolution. In order to protect energy and respond to global warming, some states in the United States and other countries have begun to ban the use of energy-efficient incandescent bulbs. A variety of new technologies are being used to replace incandescent bulbs, with compact vacuum fluorescent lamps (CFLs) being the primary alternative. Although this CFL lamp consumes only 20% of the energy of an incandescent lamp, it contains toxic mercury. In contrast, LED lights provide a more efficient and environmentally friendly solution.

The original commercial application of LEDs appeared in the 1970s, but because of its extremely low light output, the range of applications is limited to areas such as indicator lights and calculator displays. Today, high-power LEDs that produce white light continue to increase in efficiency and prices are declining year by year, making it one of the choices for mainstream lighting applications. It is expected that with the development of LED technology, its luminous efficiency will reach 150 lumens/watt by 2012, and the cost of 1000 lumens will be less than US$5 (source: OIDA), when LED is expected to become the main source of indoor lighting .

The 2008 Beijing Olympic Games made a perfect interpretation of the concepts of green Olympics, science and technology Olympics, and humanistic Olympics through the application of many specific product forms and new technologies. The LED display products, which were widely used in the 2008 Beijing Olympic Games, were even more sparkling, adding a splendid color to the 2008 Beijing Olympic Games. In recent Olympic Games, LED display screens are indispensable major facilities for Olympic venues. In 2008, the number of stadiums newly built and rebuilt in the Beijing Olympic Games was numerous and the scale was unprecedented. The Olympic venues used a large number of LED display screens as the live broadcast and scoring display equipment for the game. The display screen products were full-color, high-resolution, digital, etc. Mainly.

It can be said that the LED display products used in the 2008 Beijing Olympic Games have reached a new milestone from quantity to technology level and application. Many domestic LED display product manufacturers have played an important role. Through the efforts of global LED technology leaders to improve materials, process and packaging technology, the luminous efficiency and performance of high-brightness LEDs have been significantly improved. In addition to the traditional backlight and display panel market, high-brightness LEDs are beginning to go indoors and outdoors. New applications such as interior and exterior lighting, searchlights, and traffic lights. These all indicate that the LED driver power supply will have a broad application prospect.

Second, the interpretation of the problems faced by LED drive power

At the same time that LEDs shine, LED driver power supply is the guarantee for the development of LED industry chain. The quality of LED power supply directly restricts the reliability of LED products. Therefore, in the LED industry chain, the LED driver power supply is gradually improved today. Maturity is also crucial. As far as LED power companies are concerned, the growth rate of the high-power power market around 100W in 2009 will be greatly improved. The LED light source originating from about 100W has more outstanding cost performance than the traditional illumination source, and soon forms an industrial scale LED street lamp and landscape lighting market. Since the LED is a characteristic sensitive semiconductor device and has a negative temperature characteristic, it needs to be stably operated and protected during the application process, thereby generating a driving concept.

LED devices are almost as demanding as drive power. Unlike ordinary incandescent bulbs, LEDs can be directly connected to 220V AC mains. LEDs are low-voltage drivers of 2 to 3 volts. Complex conversion circuits must be designed. LED lamps for different purposes must be equipped with different power adapters. In the international market, foreign customers have very high requirements for efficiency conversion, effective power, constant current accuracy, power supply life and electromagnetic compatibility of LED drive power . To design a good power supply, these factors must be considered comprehensively because the power supply is in the entire luminaire. The role is just as important as the human heart.

In 2009, although the financial crisis has had a great impact on the world economy, the demand for high-power LED power supplies in international markets such as Europe and the United States is still very large, and the corresponding export volume of high-end LED products is less affected by the financial crisis. In 2008, the output value of China's LED application products has exceeded RMB 45 billion. LED demonstration application street lamps, LED full-color display devices, solar LEDs, landscape lighting, consumer electronic backlights, signals, indicators and other applications are still the main application areas. However, in the context of a prosperous market, the quality of LED products is mixed, and the requirements for driving power supply are confusing.