标签：LED emergency lighting applications

Difficulties and innovations of integration technology of LED emergency lighting applications

LED technology just took the first step in the LED emergency lighting area. Advanced driver designs, emergency feature selections and sophisticated lamp body structure designs are all waiting for further development and innovation. Especially in the LED emergency lighting standards and reliability, our current technologies are still far behind international advanced technologies. Difficulties are:

 

LED packaging technology: a reasonable LED package structure is a technological key point to improve the light extraction efficiency and the photoelectric conversion efficiency of LED Tube Light  sources. Making reasonable LED structure designs to achieve a minimum light attenuation and meet cooling and design requirements of LED emergency lighting applications is a difficult point.

Difficulties and innovations of integration technology of LED emergency lighting applications

LED cooling technology: the cooling problem of LED package has become the main obstacle that restricts the development of high-powered LED lighting products. In order to effectively solve cooling problem of high-powered LED applications, engineers need to use materials with high thermal conductivity and low deterioration.

 

Secondary lighting distribution technology: the most important parameter of LED emergency lighting applications is to meet the requirement of both general indoor lighting and emergent lighting. Average luminance, luminance uniformity and working time are three major parameters. Through the secondary lighting design, combined with the LED Flood Light -emitting characteristics, engineers need to design package structures that meet the requirements of light distribution structure and emergency lighting basic functions.

 

LED intelligent control technology: Committing researches and studies of intelligent control systems and drivers in accordance with characteristics of LED light source is another difficult point of LED emergency lighting applications. Design the optimal control mode for emergency lighting applications; take study of control modes combined with all sorts of sensors to achieve multiple intelligent controls.

 

Innovations:

Light source design: using metal substrates or ceramic substrates with high thermal conductivities; using watt-level power-type LED chips or small integrated chips; making emergency lighting white-ray sources via sapphire chips + phosphors and the RGB mixing technology.

 

Optical design: LED can send out strong directional light, the optical design of LED is relatively difficult than traditional light sources. According to the light distribution characteristic, by optimization of lens and reflectors, designers can change the transmission path and direction of LED light, improving the luminous efficiency of LED emergency lighting products.

 

Cooling technology of LED lamps: cooling problems can be easily solved by using new materials and construction designs. Applying heat pipe with eutectic technology, directly connecting conductivity materials with LED chips can effectively conduct heat, and consequently extend the service life.

The importance of LED emergency lighting applications

Emergency lighting system is an important safety facility in the modern public buildings and industrial buildings, which is closely related with the personal/building safety. When fire or other disaster happened, the central control system will cut off power. Then emergency LED Panel Light system will come into work, playing an important role to evacuation, fire-fighting and rescue works. The continuous development of LED lighting technology and applications can change the status quo of lacking of standard general/emergency lighting products. Combined with the implementation of the national emission reduction plan, manufacturers start to develop new civil emergency semiconductor lighting products with energy-saving and environmental-friendly features. These lamps can provide sufficient luminance and lighting time for escape, rescue and rehabilitation of the power system in the event of an emergency. Engineers also developed special emergency lighting products with self-energy-generation function, portable, easy to operate, reusable, with self-protection function.

 

Emergency lighting system is an important safety facility in the modern public buildings and industrial buildings, which is closely related with the personal/building safety

 

In fires, earthquakes and other natural disasters, emergency lighting devices/equipments are necessary for escape and relief. It is estimated that, in the next three years, the total demand of semiconductor lighting products will reach up to more than 2 billion yuan. With the continuous growth of China’s economy, the social safety awareness and safety standards have been greatly improved, increasing the market demand and requirements for emergency lighting devices. These products not only need to satisfy basic requirements of emergency products, but also need to be more energy-efficient, user-friendly, reliable and durable. All this additional requirements give semiconductor lighting applications a large developing space.

 

Recently Beijing University released a new research topic: “Studies of efficient driving technology and reliable system of emergency lighting applications”. This topic intend to breakthrough key technologies in the industrialization of LED emergency lighting applications, improving the semiconductor lighting industry chain. This study will concentrate on the power supply development of LED emergency lighting applications, lamp body design, secondary optical light distribution design, overall thermal design, special driver, intelligent control system for LED emergency lighting applications. The major assessment indicators are: the luminous efficiency of LED light source should be larger than or equal to 100lm/W; thermal resistance should be less than 9 ℃ / W; the luminous efficiency of the whole lighting fixture should be larger than 80lm/W; color temperature: 3000-6000K; CRI: larger than 80; power factor: larger than 0.9; the current THD should be less than 20%; the power conversion efficiency should be larger than 80%.