Five factors determining the direction of development of LED lamps

The problem with earth's greenhouse gas emissions is becoming increasingly serious, approaching the critical point earth self regulating, countries have introduced policies, including China, the governments of the world must carry out energy-saving emission reduction urgent (carbon dioxide), LED lamp is the most energy-saving green electric light source, natural lighting has become the main options for energy saving and emission reduction, with the gradual to reduce the cost and price of LED lights, its popularity is also accelerating, before 2020, LED lamp market share will exceed 50%.

Reduce the cost of LED lights

LED chip occupy the main part of the cost of the LED lamp, thus reducing the cost of LED is the main way to reduce the cost of LED chips.

The key to the development of LED chip technology is the substrate material and the epitaxial growth technology. Based on the traditional material of sapphire, silicon and silicon carbide, the development of new materials, such as Zinc Oxide, gallium nitride. In just a few years, with the help of a series of technical improvements, including the chip structure, surface roughening treatment and multi quantum well structure design, LED achieved a great breakthrough in the light efficiency.

The silicon cost is very low, technology is in progress, but the luminous efficiency is still not satisfied, if you keep this pace of development, once reached a higher level, will become the main technical scheme of silicon has become an inevitable choice, enterprises will gain great economic returns.

Improve the luminous efficiency of LED lamps

Improve the efficiency of light can also improve the proportion of effective light from the start. Thin film chip technology can reduce the loss of the light output side, with the bottom of the reflector in more than 97% of the light output from the front, the power conversion by light is mostly effective light, not only significantly improve the optical efficiency of LED, but also created favorable conditions for the convenience of lens design. Thin film chip technology is the core technology in the production of ultra bright LED chip.

Improving the color rendering of LED lamp

In the high brightness white LED, a small fraction of blue light has a longer wavelength after the Stokes shift. This is a good thing, because it makes LED lamp manufacturers can use many different color phosphor layer, thereby expanding the emission spectrum, effectively improve the LED color rendering index (CRI). The use of phosphors for white light LED to obtain a high CRI is a price, because the Stokes shift will result in the efficiency of white LED is lower than the efficiency of monochromatic LED. But for most lighting applications, prefer to use a high CRI and low efficiency of the LED lamp.

Improve the efficiency of LED lamp power supply

Whether it is to do the current limiting current control power supply, or op amp Control of constant current power supply, power supply to solve the problem. That is, when switching power supply chip work is the need for a relatively stable DC voltage supply for the chip, the chip current from a MA to a few MA. Like FSD200, NCP1012, and HV9910, the chip is pressure from the feed, it is convenient, but high pressure feed, due to the rise of the IC heat, because IC DC to bear about 300V, as long as a little current, even if a MA, also damaged zero point three watt consumption. General LED power supply is only about ten watts, the loss of a few watts watts can be pulled down a few points. Typical image QX9910. Use the resistance to pull down the electricity, so that the loss is on the resistance, about to lose it a few watts. There is a magnetic coupling, that is, with the transformer, the main power coil plus a winding, like the auxiliary winding of the flyback power supply, so as to avoid the loss of the power of a few watts. This is why one of the reasons not to isolate the power supply transformer, is to avoid the loss of the power of a few watts, the efficiency of several 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, efficient, choose the right color and output power.

Control and drive: the use of electronic circuits to achieve constant current drive and control LED.

Thermal management: if you want to achieve a longer service life must control the temperature of the LED node, heat dissipation model calculation and the use of new materials and new technology is the hot spot of LED technology.

Optical elements: lens, reflector or light guide plate material is to focus on the target area or scattered around the light, which is based on design requirements.

With the rapid development of LED technology and the gradual improvement of LED light efficiency, the application of LED lamp will be more and more widely. Especially with the increasingly serious problem of global energy shortage, LED lamp will be the inevitable choice to replace incandescent lamp, tungsten lamp and fluorescent lamp. In addition, in the interior lighting design, LED will tend to intelligent, diverse and artistic.