    The multi-chip LED integrated package is one of the ways to achieve high-power white LED lighting . This paper summarizes the characteristics of integrated packaging, from product application, packaging mode, thermal processing and optical design, and analyzes the development trend of integrated packaging, with the wide application of high-power white LED in the field of lighting. The integrated package will also be developed rapidly.
At present, there are two ways to achieve high-power LED lighting : one is to package a single high-power LED chip , and the other is to use a multi-chip integrated package. For the former, with the development of chip technology, the size is increased, the quality is improved, and high-power LED can be realized by high-current driving, but at the same time, it is limited by the chip size, and the latter has greater flexibility and development potential. The number of chips can be changed according to the illuminance, and it has a high cost performance, making the LED integrated package one of the mainstream directions of the LED package .
Integrated packaged product applications
According to reports, UOE Corporation of the United States introduced the Norlux series of LEDs in a multi-chip package using hexagonal aluminum plates as substrates in 2001; Lanina Ceramics introduced low-temperature sintered ceramics (LTCCM) on the company's unique metal substrate in 2003. High-power LED arrays packaged in technology; Panasonic introduced high-power white LEDs packaged in 64 chips in 2003; 6.4W, 8W, 12W COB led series light sources from Everlight, integrated with MCPCB substrate multi-chip In this way, the heat transfer distance is reduced and the junction temperature is lowered.
On the basis of analyzing various technical schemes of LED fluorescent lamps, Li Jiansheng used COB technology to directly fix small power chips on aluminum substrates to make COB LED fluorescent lamps with high efficiency. Since 2009, 45,000 LED fluorescent lamps have been used. The Expo bus and nearly 4,000 city buses were modified to replace the original fluorescent lamps and received favorable comments from users, serving the Shanghai World Expo and urban traffic.
Yang Lan developed a led explosion-proof lamp using a multi-chip integrated package led light source module, which uses a heat pipe cooling technology . The LED explosion-proof lamp has high brightness, long irradiation distance, high reliability, good heat dissipation performance and long service life.
LED integrated package features
Also known as an integrated package polycrystalline package, the size of the required power to determine the number of chips on a substrate according led chassis, the combination may be packaged as 1W, 2W, 3W power led high luminance device, finally, a high refractive index The material encapsulates the chip in an optically designed shape.
The unique packaging principle of integrated package determines its many advantages, such as: (1) As far as China is concerned, the research and development of high-power chips is in a backward position. The use of integrated packaging is a shortcut for development, and is more in line with China's basic national conditions; (2) The chip can be designed to be connected in series or in parallel, flexible to adapt to different voltages and currents, to facilitate the design of the driver, to improve the light efficiency and reliability of the light source; (3) the number of chips on a certain area of ​​the substrate can be freely controlled, according to The customer's requirements can be packaged into point light source or surface light source in various forms. (4) The chip is directly connected to the substrate, which reduces the thermal resistance of the package, and the heat dissipation problem is easy to handle.
However, for integrated packaging, there are also some shortcomings: (1) due to the multi-chip integrated package on a substrate, resulting in a larger volume of the resulting light source; (2) multiple chips are combined by series and parallel, relative In the case of a single chip, its reliability is poor, which will cause the overall light source to be affected. (3) Although the multi-chip package has a strong heat dissipation capability compared to a single chip of the same power, the heat is dissipated by multiple chips at the same time. Different degrees of loss will cause different temperatures between the chips and affect the life. Therefore, the handling of heat dissipation is also critical. (4) The design problem of secondary optics, the multi-chip light extraction angle is different, and it is necessary to carry out the second optical design. Sub-optical design to meet user requirements.
Equipped with ergonomically designed elastic headband
Made in USA or Imported
[HIGH PERFORMANCE - ULTRA BRIGHT]-- Led Headlamp flashlight using CREE XMLT6 LED bulbs, CREE chips provide bright vision for you. Up to 12000 lumens to give you the brightest illumination, durable, long lasting, life time 100,000 hours.
[RECHARGEABLE & LONG LASTING]-- CREE LED headlamp powered by 2*rechargeable 18650 Lithium Ion batteries and charges via usb charging cable, after being fully charged, it can continuously last 4-5 hours, convenient and environmentally friendly.
[COMFORTABLE AND ADJUSTABLE ]-- Headlamp with its 120° tiltable angle so that you can adjust the brightness zone as you want. It is equipped with breathable elastic band and for easy adjustment, not sliding, which makes it comfortable for both adults and children.
[4 WORKING MODES]-- Lamps have 3 levels of white light brightness and strobe modes. Normal brightness mode-1 T6 LED light up, power saving mode-2 XPE LED lights up, bright mode-3 LED lights up, SOS strobe -3 LED lights blinks. Red warning light on the back of the headtorch plays a warning role.
[ALL-WEATHER READY]-- IPX4 water resistant, the air-tight rubber sealing protects the headlamp battery from dust and water. Headlamp comes in aluminum and up-to-date plastic materials and has high hardness and is not afraid of falling. Makes it applicable to more outdoor scenarios: running, camping, hiking and other outdoor activities or indoor work needs.
Zoomable Headlamp,Intelligent Led Headlamp,Light Sensing Headlamp,Outdoor Led Headlight
Ningbo Wason Lighting Technology Co.,Ltd , https://www.wasonlight.com