The five main elements of the technology development direction of LED lamp
As the Earth's greenhouse gas emission problem is becoming more and more serious, approaching the tipping point of the Earth self-regulation, countries have issued relevant policies, including our country, the world's governments must urgently implement energy-saving emission reduction (carbon dioxide), LED lamp is the most energy-saving green light source, natural lighting energy-saving emission reduction of the main options, with the LED lamp costs and prices gradually reduced, the popularity of the speed is also accelerating, before 2020, LED lamp market share will exceed 50%.
Reduce the cost of LED lights
LED Chip occupies the main part of the cost of LED lamp, so the main way to reduce the cost of LED is to reduce the cost of LED chip.
The key to the development of LED chip technology is base material and epitaxial growth technology. Base materials from the traditional sapphire materials, silicon and silicon carbide, to the development of zinc oxide, gallium nitride and other new materials. In just a few years, with the help of a series of technical improvements, including chip structure, surface coarsening and multi quantum Well structure design, LED has achieved a great breakthrough in optical efficiency.
Silicon substrate cost is very low, technology in the continuous progress, but the current luminous efficiency is not satisfactory, if this development speed, once reached a higher level, then the silicon substrate become the most important technical options become inevitable choice, enterprises will also be a huge economic return.
Improve the light efficiency of LED lights
Improving light efficiency can also be based on increasing the proportion of effective light. Thin-film chip technology can reduce the light output of each side of the loss, with the help of the bottom of the reflector more than 97% of the light output from the front, so that the energy conversion of the light is most of the effective light, not only significantly improve the light efficiency of the LED, but also for the lens design to Thin-film chip technology is the core technology in the production of Ultra bright LED chips at present.
Improve the color rendering of LED lights
In High-brightness white LEDs, a small portion of blue light has a longer wavelength after the Stokes shift occurs. This is a good thing, because this makes the LED lamp manufacturers can use many different colors of the phosphor layer, thereby extending the emission spectrum, effectively improve the LED color index (CRI). The use of phosphor white light led to the high CRI is a cost, because the Stokes displacement will cause white LED efficiency is lower than monochrome led efficiency. However, for most lighting applications, it is preferred to choose a high CRI and a slightly lower efficiency LED lamp.
Improve the efficiency of LED lamp power supply
Whether it is to do the current control of constant current power supply, or the operation and discharge control of the constant current power supply, we must solve the problem of power supply. The switching power supply chip is required to work with a relatively stable DC voltage for its chip power supply, the chip working current from a MA to a few ma ranged. Like FSD200, NCP1012, and HV9910, this kind of chip is high voltage feed, use is convenient, but high voltage feed, cause IC heat rise, because IC to withstand about 300V DC, as long as a little current, even a MA, also have 0.3 watts of damage consumption. General LED power supply is only about 10 watts, the loss of a watts can be the efficiency of the power down a few points. Typical like QX9910. , with resistance to pull the electricity, so that the loss on the resistance, about to lose it a tile it. There is the magnetic coupling, is the use of transformers, in the main power coil with a winding, like the flyback power supply winding, so as to avoid loss of the power of the A tile. This is also why do not isolate the power supply to use Transformers is one of the reasons, is to avoid losing the power of the A watts, the efficiency will be raised a few points.
Improve the reliability of LED lamp system
The overall efficiency, service life and reliability of LED must be improved through system optimization.
Light Source: Compact and efficient, choose the right color and output power.
Control and drive: the use of electronic circuits to achieve the LED constant current drive and control.
Thermal management: To achieve longer service life must control the temperature of the LED node, heat dissipation model calculation and new materials of the application of the technology is a hot spot of LED lights.
Optical elements: lenses, reflectors or light guide materials are focused on the target area or dispersed within four weeks, depending on the design requirements.
With the rapid development of LED technology and the gradual improvement of LED light efficiency, the application of LED lights will be more and more extensive. In particular, as global energy shortages become increasingly serious, LED lights will be a necessary alternative to incandescent, tungsten and fluorescent lamps. In addition, in the interior lighting design, LED will tend to be intelligent, diverse and artistic.