The key to the development of LED chip technology lies in the substrate material and epitaxial growth technology. The base material is developed from traditional sapphire materials, silicon and silicon carbide to new materials such as zinc oxide and gallium nitride. In just a few years, LEDs have achieved great breakthroughs in light efficiency with a series of technological improvements including chip structure, surface roughening and multi-quantum well structure design.
Reduce the cost of LED lights
LED chips occupy a major part of the cost of LED lamps, so the main way to reduce the cost of LEDs is to reduce the cost of LED chips.
The key to the development of LED chip technology lies in the substrate material and epitaxial growth technology. The base material is developed from traditional sapphire materials, silicon and silicon carbide to new materials such as zinc oxide and gallium nitride. In just a few years, LEDs have achieved great breakthroughs in light efficiency with a series of technological improvements including chip structure, surface roughening and multi-quantum well structure design.
The cost of silicon substrate is very low, and the technology is constantly improving. However, the current luminous efficiency is still not satisfactory. If this speed of development is maintained, once the higher level is reached, the silicon substrate becomes the most important technical solution and the enterprise will also become an inevitable choice. Gain huge economic returns.
Improve the color rendering of LED lights
In high-brightness white LEDs, a small portion of the blue light has a longer wavelength after a Stokes shift. This is a good thing because it allows LED lamp manufacturers to use many different color phosphor layers to extend the emission spectrum and effectively increase the color rendering index (CRI) of the LED. High CRI obtained with phosphor white LEDs comes at a price because Stokes shifts cause white LEDs to be less efficient than monochromatic LEDs. However, for most lighting applications, it is preferred to use high CRI and slightly less efficient LED lights.
Improve the reliability of LED lamp systems
The overall efficiency, service life and reliability of LEDs must be optimized through system optimization.
Light source: compact and efficient, choose the right color and output power.
Control and drive: Use electronic circuitry to achieve constant current drive and control of the LED.
Thermal management: In order to achieve a longer service life, it is necessary to control the temperature of the LED node. The calculation of the heat dissipation model and the application of the new material and new technology are hot spots of the LED lamp technology.
Optical components: The lens, reflector or light guide material is used to focus the light on the target area or spread around it, depending on the design requirements.
Improve the efficiency of LED light power
Whether it is a power supply with current limiting constant current control or a constant current power supply controlled by an op amp, the power supply problem must be solved. That is, when the switching power supply chip works, it needs a relatively stable DC voltage to supply power to its chip. The working current of the chip varies from one MA to several MAs. Like FSD200, NCP1012, and HV9910, this chip is self-fed by high voltage, which is convenient to use, but the high voltage feed causes the heat of the IC to rise. Because the IC has to withstand about 300V DC, as long as it has a little current, An MA also has zero point three watts of damage. Generally, the LED power supply is only about ten watts. If you lose a few watts, you can pull down the efficiency of the power supply by a few points. Typical like the QX9910. Use the resistor to pull down the power, so that the loss is on the resistor, and it will lose about a few watts. There is also magnetic coupling, which is to use a transformer to add a winding to the main power coil, just like the auxiliary winding of the flyback power supply, so as to avoid losing the power of a few watts. This is one of the reasons why it is not necessary to isolate the power supply and use a transformer. In order to avoid losing the power of a few watts, the efficiency is raised a few points.
As the issue of global greenhouse gas emissions is becoming more and more serious and approaching the critical point of self-regulation of the earth, countries have introduced relevant policies, and governments around the world, including China, must implement energy-saving emission reduction (CO2) without delay. LED lamps are currently the most energy-efficient. Green environmental protection electric light source has naturally become the main choice for lighting energy saving and emission reduction. With the gradual reduction of the cost and price of LED lamps, the popularity of the LED lamps is also accelerating. Before 2020, the market share of LED lamps will exceed 50%.
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