LEDs rely on high luminous efficiency, low power consumption, long service life, strong safety and reliability, and environmental protection, making LED applications develop in 2008. At the same time that the LED shines, the LED driver power supply is the guarantee for the development of the LED industry chain. The quality of the LED power supply directly restricts the reliability of the LED product. Therefore, in the LED industry chain in China, the LED driver power supply is gradually improved today. Maturity is also crucial.
Since the LED is a characteristic sensitive semiconductor device, it has a negative temperature characteristic. Therefore, it is necessary to stabilize the working state and protection during the application process, thereby generating the concept of driving. The requirements of the LED device for the driving power supply are almost harsh. The LED is not like the ordinary incandescent bulb, and can be directly connected to the 220V AC mains. The LED is a low voltage driver of 23 volts. It is necessary to design a complicated conversion circuit. LED lamps for different purposes must be equipped with different power adapters. LED drive power supply voltage matching requirements are very high. The quality of the drive power is the key guarantee for the longevity of the LED.
After investigating a number of LED driver power supply manufacturers such as Shenzhen Laifu Optoelectronics and Shenzhen Shenjuyuan Electronic Technology, the author learned that the efficiency conversion, effective power and constant current accuracy of LED driver power supply by foreign customers in the international market. The requirements for power supply life and electromagnetic compatibility are very high. To design a good power supply, we must consider these factors comprehensively. Because the power supply plays a role in the whole luminaire just as important as a human heart!
In 2009, aside from the impact of the financial crisis 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. The corresponding export volume of high-end LED products is affected by the financial crisis.
In 2008, the output value of LED application products in China has exceeded 45 billion yuan. LED demonstration application street lamps, LED full color display, solar LED, landscape lighting, consumer electronic backlight, signal, indication and other applications are still the main application areas, but in the domestic market. Under the background of prosperity, the quality of LED products is mixed, and the requirements for driving power supply are chaotic. It is also the main factor for the reshuffle of LED companies in recent months.
In the domestic market, LED products are in full swing, and the technical requirements for the current output of LED drive power are challenged. In order to extend the service life of LED lighting, integrated circuit power supply is often used. Therefore, the method of power supply of constant current source circuit should be designed. When driving with large current, it must be equipped with high power tube or thyristor device, and a protection circuit, which leads to LED. The power supply circuit is complex and the failure rate increases. Component costs, production costs, and service costs will all increase. At present, the cost of LED itself is high, and the cost of power supply greatly limits the market competitiveness and purchasing group of LED products. The advantages of LED products are greatly reduced, which is another key issue that restricts its development and popularization. .
As far as LED power companies are concerned, Li Xu, general manager of Shenzhen Shenjuyuan Electronic Technology Co., Ltd. believes that the growth rate of the high-power power market around 100W in 2009 will be greatly improved. Compared with traditional lighting sources, LED light sources originating from about 100W have more outstanding cost performance, and soon form industrial scale LED street lights and landscape lighting.
Conclusion:
The main challenges currently facing LED drive power companies include:
1. The overall life of the drive circuit, especially the life of key components such as capacitors at high temperatures directly affects the life of the power supply;
2. LED drivers should challenge higher conversion efficiency, especially when driving high-power LEDs, because all power that is not used as light output is dissipated as heat, and the power conversion efficiency is too low, which affects LED energy-saving effect. Play
3. High-efficiency LED dimming with large dimming ratio, while ensuring constant color characteristics at high and low brightness;
4. Reduce the cost. At present, in the application of low power (1-5W), the proportion of constant current driving power supply is close to one-third, which is close to the cost of the light source, which affects the market promotion to some extent.
With the development of the domestic LED industry, the national policy layer is increasingly concerned about the LED industry. Under the spur of domestic demand and promotion of consumption policies, infrastructure projects have started, and the market is gradually recognizing LED products. The domestic lighting market share will be larger and larger, and the LED industry will have a broader market prospect in 2009.
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