LED lighting, had to master the technology

Want to do a few key parts of a lighting product can not be known, the popular saying is the distribution of light, structure, electronics, and light distribution, structure, electronic terminology expressed as: optical properties, thermal properties, electrical properties. At the same time, light distribution is particularly important. If you don't understand light distribution, you can't do good lighting.

Optical properties (light distribution): The optical properties of LEDs mainly relate to the performance requirements in terms of spectroscopy, luminosity and chromaticity. According to the newly developed industry standard "semiconductor light-emitting diode test method", there are mainly emission peak wavelength, spectral radiation bandwidth, axial luminous intensity angle, luminous flux, radiant flux, luminous efficiency, chromaticity coordinates, correlated color temperature, color purity, and main Wavelength, color rendering index and other parameters. The LEDs used for display are mainly visual and visual effects. Therefore, the relevant color rendering index is not required. The white LEDs used in lighting, color temperature, color rendering index and illumination are particularly important. It is an important indicator of lighting atmosphere and effect. Color purity and dominant wavelength are generally not required.

At present, the mainstream practice in the global LED industry is to encapsulate LED chips to form a light source or a light source module and then perform light distribution when making a light fixture. This uses the original traditional light source approach because the traditional light source is 360°. . If you want to guide the light to the application, Philips' traditional lamps do the best, and the light loss reaches 40%. The optical parameters of lamps used by many of our domestic LED downstream manufacturers are actually optical parameters of the chip or light source, rather than the optical indicators of the overall lamp.

The most advanced scientific method now is to distribute light on the chip package, to export the light of the chip at a time and maintain the maximum light output, so that the optical loss rate is only 5%-10%. With the continuous improvement of technology, the light loss rate will become lower and lower, and the light efficiency of the light source will become higher and higher. Also with such a light source lamp does not need to do light distribution, the relative efficiency of the lamp will be greatly improved, making it more widely used in functional lighting, forming a considerable scale of market channels. Therefore, a good LED supplier is our top priority. We don't need to pay a high price to study how our LEDs match the light, nor does it take a lot of time and experience for engineers to use software simulation. The easiest way is Let LED white light suppliers cooperate. To know that our engineers use software to simulate, the necessary actions are input and output. The input is the data import of the previous period, and the output of the simulation is the result of the simulation. Therefore, the data in the previous period must be accurate and correct.

Thermal performance (structure): The LED lighting efficiency and power provided by the lighting is one of the keys of the LED industry. At the same time, the PN junction temperature and heat dissipation of the LED are particularly important. The greater the difference between the PN junction temperature and the lamp body temperature, the greater the thermal resistance, and the consequent conversion of light energy into heat energy is consumed in vain. In severe cases, the LED is damaged. A good structural engineer should not only consider the structure of the lamps and the thermal resistance of the LEDs, but also consider whether the appearance of the lamps is reasonable, fashionable, novel, and of course reliability, maintainability, and practicality. From the perspective of thinking, but also to consider the user's point of view to consider the product ...

At present, the upstream dragon companies, such as CREE can already achieve the chip light efficiency can reach 130-150lm/W. However, the LED junction temperature directly affects the LED light output efficiency, device lifetime, reliability, and emission wavelength. Keeping the LED junction temperature within the permissible range is a key factor that must be studied in every aspect of high-power LED chip preparation, device packaging, and device application. In particular, the core issues that LED device packaging and device application design must focus on must be addressed.

Currently, the mainstream application technology materials are packaged on aluminum substrates. However, chip cooling and optical conversion efficiency in aluminum substrate packages all have bottlenecks in the technical core, which can not effectively control the junction temperature and stably maintain the high-power light output, and the application will be due to chip light. The higher the efficiency, the larger the area of ​​the aluminum substrate required, which will increase the cost and the application volume, making it extremely inconvenient. Therefore, how to get out of this misunderstanding and create new roads is the core feature of the new technology. Under the premise of maintaining low-cost and passive heat dissipation methods, the use of high thermal conductivity media, through the new overall structure of the device/lamp, reduces the thermal resistance, reduces the junction temperature of the PN junction, and allows the PN junction to operate within the allowable operating temperature, maintaining the maximum amount of photons. The output, its minimum requirements are as follows:

(1) ultra-low thermal resistance materials, rapid cooling overall structure technology;

(2) High thermal conductivity, UV-resistant packaging technology;

(3) Application of low environmental stress structural techniques;

(4) Overall thermal resistance <20K/W, junction temperature <80 degrees;

(5) LED light source lighting module operating temperature below 65 °C.

Electrical performance (electronics): If you compare a lighting fixture to a girl, then the distribution of light is her connotation, the structure is her appearance, and electronics is her heart. (It's always the beautiful, fashionable beauties that attract people's attention, and so does the product.) People who do not have a heart have no life. Lamps do not have power without electronics. A good driver can also determine the lifespan of a product. Electronic standards and parameters are often much more complex than the structure, and the previous research and development effort is also relatively large. The current technology trends and updates are changing day by day, one day at a time... Engineers have to spend a lot of energy to learn, absorb, decompose, and apply new technologies. The early planning of electronic design, the implementation in the medium term, and the formation of the later stage require the formation of documents and the formation of data. This is the most tedious thing in design. For example: a power supply design a pre-plan, product description, standard specification basis, safety specification basis, electrical performance expectations, process requirements, raw material assessment, test methods, etc. must form a system file...

In the field of LED drive power, the development path of Moosuo Power Company, now the leader in the industry, is full of legends. Due to his keen sense of smell in the LED industry, Gu Yongde, chief of Maoshuo Power, led his team to invest in LED power supply in 2006. Today, the world's leading technology of MoSola Power has led the trend of intelligent driving of LED street lamps, and proposes the most reliable intelligent driving solutions for LED street lamp manufacturers. This is another example of a leading philosophy.

LED drive power powerful

LED power as the core components of LED lights, like the heart of LED, LED drive power directly determines the quality of LED lamps.

First of all, in the structural design, outdoor LED drive power must have a strict waterproof function, otherwise, can not withstand the harsh environment of use.

Second, the lightning protection function of LED drive power is also important. When working outside, it is difficult to avoid thunderstorms. If the driver power supply has no lightning protection function, it will directly affect the life of LED lamps and increase the cost of lighting maintenance;

Finally, in the selection of raw materials, its reliability must meet its life expectancy, and its functional characteristics must be sufficiently good. At present, the theoretical life of the LED chip is about 100,000 hours, and the components of the industrial components should be matched with it. The selection of key components must be verified and managed by the perfect DMT and DVT to ensure long life and product reliability requirements. The life of the power supply is not enough and the lamp life cannot be achieved.

Therefore, the reliability of the LED drive power supply (electronic design) is the basis for supporting the development of LED. The LED drive power supply is superior to traditional lamps in terms of energy saving, high efficiency and longevity, so that LED can truly save energy and reduce consumption, and promote the development of the industry. LED heat dissipation (structure design) is the key to determining lumen maintenance, component, and device safety. LED light distribution (optical design) is a symbol of industry technology. Having mastered the above three technologies, LED lighting is also simple.