Lighting to enhance the flexibility of design, lighting equipment to bring new intelligence and differentiation

Digital control flexibility makes OEM as long as the design of a controller, you can drive a variety of end products, improve the design flexibility, intelligence and bring new differences for lighting device. As the lighting industry turns to LED technology, it also increases the need for more intelligent controllers and drives. The efficient operation of LED can effectively restrain the household and unit electricity consumption. Many applications need to provide constant lighting quality, while supporting advanced control functions, such as dimming, color temperature equalization, as well as accurate color mixing, etc.. Application of self diagnosis can reduce the demand for technical personnel, thereby reducing maintenance costs. Adding intelligence to LED lighting applications may require steering from a fixed function LED driver based on microcontroller or programmable architecture. The special power electronic micro controller can also control the lighting power outside the lighting control and communication, so as to make the lighting application more efficient and cost effective. The conversion to digital control enhances the flexibility of lighting products to achieve new levels of intelligence and differentiation. Access to the smart platform lighting industry is rapidly taking advantage of the many advantages of LED Technology (see Annex "LED's strengths"). However, there is a big difference in the ability to support LED applications. Home applications include bulb replacement, key lighting, and small outdoor lighting. Under normal circumstances, only a small number of LED lighting, usually a string of two. In view of the low cost pressure in the market, it is not commonly used in advanced control functions. Commercial applications include fluorescent ballasts, bulb replacements, and key lighting. Only need to light a few LED, usually a bunch of two strings. Although concerned about the cost, but the market also focus on energy conservation. Higher end applications require remote connectivity capabilities, as well as some controller intelligence. Entertainment applications include high-end display and situational lighting. Complete control of light intensity and color quality consistent from beginning to end is the basic needs, in addition to a remote connection, and supports industry standard protocols, such as DALI (digital addressable lighting interface) and DMX512. outdoor and infrastructure applications including street lighting and lighting factory and large office building. Usually requires a large number of LED, must support a lot of light string; high brightness LED is also very common. These applications require remote connectivity capabilities, as well as a high level of intelligent controller. The simplest lighting system based on LED is the use of a LED driver, usually a fixed function device, which provides a simple and direct low-cost control method. In general, they have good power efficiency, no software programming. The developer has to do some calculations at the time of selecting the drive or determining the specific values of the components on the circuit board. Although the use of simple and clear, but many LED drivers lack the flexibility of more advanced systems. To support multiple LED types or LED string structures in a given application, different scenarios may be required. In fact, any changes in the system may need to change the drive, such as a number of changes in the number of LED, or a device in the number of LED changes, etc.. Thus, most of the lighting products offered by a OEM may require specialized analog drives. If a large number of products, this requirement will increase the variety of OEM or vendor inventory, may reduce economies of scale, or lead to higher equipment costs. On the other hand, the intelligent controller allows developers to create a more flexible lighting system. The system uses the micro controller, you can configure the code to support a variety of different types of LED, the exclusive power level requirements, different length and different string, string number, without changes to the hardware and. The system can be designed to automatically detect the number of LED required to drive. The programmable features of the microcontroller system can even achieve advanced dimming and timing functions for more advanced lighting scene control and automatic illumination levels. The flexibility of digital control enables the OEM to drive a variety of final products as long as a controller is designed. Reuse control IP can also greatly reduce design inputs. A flexible controller can reduce the number of devices that need Inventory, and reduce the total system cost through economies of scale. The basic architecture of an intelligent LED lighting system integrated with digital control consists of three main parts: power conversion, LED control and communication (Figure 1). The power conversion stage provides the correct voltage and current for the LED. The AC/DC is started with a rectifier followed by a PFC (power factor correction) stage, followed by one or more parallel DC/DC conversion stages. High efficiency power conversion requires accurate and flexible control of these stages. Each part of the main stage requires an intelligent controller to maintain its efficiency and functionality. Fixed function simulation scenarios may require separate PFC, DC/DC, LED, and communication controllers. The special power electronic microcontroller can achieve a high degree of integration, reducing the number of components of the power supply. In fact, the single micro controller performance, power optimization and peripheral communication port enough, can provide a programming platform of the center, all the three level to coordinate control of an intelligent lighting system, the power supply, LED lighting control and communication tasks. Digital power control is also possible to achieve higher conversion efficiency. Although the efficiency of LED is obviously improved compared with the traditional light source, the use of the utility model is reduced correspondingly