Low power LED general lighting applications

With the continuous improvement of LED in almost all aspects of light output performance, cost, LED general lighting has become a very attractive alternative to traditional lighting such as incandescent lamps. Typical LED general lighting applications include light bulbs and fluorescent tubes replacement, recessed lights, street lights and stop lights, work lights, landscape lighting, billboards text circuit, building lighting, etc.. LED street lamp power is high, generally between 50W to 300W; LED building.

In recent years, lighting has become an important area of energy conservation and environmental protection. According to statistics, about 20% of the world's electricity can be used for lighting every year, and about 40% of these energy is used for inefficient incandescent lighting.

With the continuous improvement of LED in light output performance, cost and other aspects, LED general lighting has become a very attractive alternative to traditional lighting such as incandescent lamps. Typical LED general lighting applications include light bulbs and fluorescent tubes replacement, recessed lights, street lights and stop lights, work lights, landscape lighting, billboards text circuit, building lighting, etc..

High power LED lamps, generally between 50W and 300W; LED power building and area lighting applications in general 40W to 125W, which belongs to medium power range; below 30W can be called the low power LED lighting applications, including a specific point such as lighting, cabinet lighting, PAR20/30/38 lighting lamp embedded lights, lamp replacement so, as well as omnidirectional lighting, lighting, household appliances, such as the focus of general lighting A lamp replacement, decorative lamps and ceiling fan lamp etc..

In this paper, we will focus on the low power LED general lighting applications under 30W, and the corresponding energy efficiency solutions for A Morimi semiconductors. Low power LED lighting applications drive the driver to consider the main function of the LED driver is to limit the current in the operating conditions, regardless of how the input and output conditions change.

The application design is facing a variety of restrictions, such as high efficiency, high performance, wide environmental conditions, high reliability, flexible, with electromagnetic interference and harmonic content of the standard, can be adapted to existing application and can adopt the traditional control method etc.. It is not easy to select the appropriate drive for low power LED applications, and the need to take into account the different factors.

For example, the commercial and residential market for LED lamps in the operating temperature, duration, performance and energy star and other industry standards are not the same. In addition, there are also unique challenges of bulb replacement applications, such as LED power supply and the driver's thermal limit, size limited and compatible dimming technology, etc.. In terms of the applicable standards for LED general lighting, the power factor correction standards required by the "Energy Star" of the United States and the International Electrotechnical Commission of the European union. Among them, the "Energy Star" V1 version of the standard lighting requirements LED lighting with PFC, suitable for embedded lamps, cabinet lights and lamps and other specific products, but not with the power level. This standard requires that the power factor (PF) of residential applications is higher than 0.7, while the commercial application is higher than 0.9. This standard is voluntary standards will be implemented in September 2011.