LED is an electroluminescent light source whose principle of illumination is to apply a forward voltage across the PN junction, and holes in the P region will flow to the N region. The electrons in the N zone will flow to the P zone. As the composite of minority carriers and majority carriers releases energy, some of the energy is converted to heat and the other part is converted to light.
The color of the LED is determined by the substrate and the material that is infiltrated. It is basically pure monochromatic light except for white light. The light color is easy to control, so it can be widely used in various traffic lights, hand lights, Display screen, etc. The traditional railway hand-held lights use ordinary incandescent bulbs or inflated incandescent bulbs as light sources to generate corresponding red, green and yellow signals through red, green and yellow polycarbonate filters. It is difficult to accurately control the amount of toner added during the molding process, resulting in impure color. On the other hand, polycarbonate will degrade yellowing after long-term use, especially under sunlight, affecting the displayed color. Moreover, the incandescent bulb has a service life of only a dozen hours, frequent replacement, and the continuous working time does not reach the required time of more than 10 hours. The lamps are also heavy and inconvenient to carry.
At present, many manufacturers use red, green and yellow LEDs as signal light sources, and some manufacturers use multiple super bright white LEDs as white light sources, but white light can only be used as a signal because of low light efficiency, low power and insufficient illumination. It does not work as a working light.
Since the luminous efficacy of the LED is improved to be close to that of the incandescent lamp, and the range of color variation is increased, it has the basis of becoming a light source of the lamp, and has short response time, low heat generation, low energy consumption, long life, and maintenance cost. The low-end advantage immediately makes LEDs have a lot of applications in the number of lights. With the continuous improvement of optical design and the continuous improvement of LED light efficiency, the number of LED tubes required for the number of lamps has dropped from four or five hundred at the beginning to one hundred or even dozens.
High-power LEDs have advantages over general LEDs in the number of lights:
1. Different materials used: epoxy resin is generally used as the mounting board, and high-power LEDs need to use aluminum-based circuit boards (MCPCB).
2. Different manufacturing processes: general LEDs can be used with wave soldering machines or manual soldering, while high-power LEDs require patch soldering machines.
3. The matching electronic components are different: because the welding process is different, the electronic components matched with the general LEDs also need to use the wave soldering machine or the general components of the manual soldering, and the electronic components supporting the high-power LEDs need to use the patch components.
4. Different degrees of automation: Due to different manufacturing processes, SMD (sMD) production is highly automated, and pipeline production lines can be used. However, due to the difference in appearance and structure of general LEDs and general components, there is a considerable part of work such as insertion. Tubes and the like need to be done manually, which results in different working hours for the two processes.
5. Different processing performance guarantees: Since electrostatic protection and other measures are important factors affecting LED service life, and the general automation of LED production is not high, measures such as electrostatic protection are difficult to implement, so the production process of high-power LED is relatively easy to guarantee. The perfect performance of the LED.
6. Different degree of integration: Since the high-power LED adopts the chip-type process, its electronic components can be highly integrated, and the lamp board and the power supply can be made very little, and the general LED and its supporting components are difficult to realize.
7. Structural design requirements are different: due to the low power of LEDs, the heat of a single LED is low (of course, these LEDs have low heat-generating ability and poor heat dissipation), and they are distributed throughout the light-emitting surface, thus improving their heat dissipation. The measures are difficult to implement, and the high-power LEDs are relatively concentrated, and are mounted on the aluminum substrate using a patch process, so that it is easy to design some heat sinks, and the light boards are directly mounted thereon to improve the heat dissipation effect.
8. The design requirements of light distribution are different: general LEDs are distributed evenly throughout the entire light-emitting area because of the number of tubes used. Therefore, it is necessary to correspond to LEDs when distributing light, and the number of high-power LED tubes is less, generally 300mm The requirement can be met by using 12 or even 8 pieces. Therefore, the entire lamp board is placed near the axis of the light-emitting surface, and is designed as a concentrated light source in the case of light distribution.
9. The effect of use is different: the general LED is distributed in the range of the entire light-emitting surface due to the emitted light exiting angle, and the distance between each other is large. Therefore, the effect of projecting on the light-emitting surface can be clearly seen. The illuminating light source is distributed, and because there is a strong intensity in the light intensity distribution of the LED light source, and there is often uneven spot in the package, the entire illuminating surface is bound to have a distinction between light and dark, and the light distribution is one-to-one correspondence. In this way, in the event of failure of one or a string of LEDs, dark spots will appear, affecting the efficacy and graphics of the entire lamp. The high-power LEDs are relatively concentrated and are similarly used as concentrated light sources during light distribution, so the above defects can be avoided.
10. Different service life: Since the high-power LED has a small number of tubes and few branches, it is easy to use the power supply of the branch constant current to ensure that each LED has the same power supply environment, even if there are individual failures, it will not affect other LED supply current. The heat dissipation effect is good, and the node temperature is relatively lowered, so the life is prolonged. Allows a large operating current, which is more than ten times that of a general LED. Therefore, the current control fluctuates by a few milliamperes, which does not affect the high-power LED at all. However, compared with the general LED, it may be a fatal blow, so the power supply is accurate. The dependence of the control is small, and it is also beneficial to increase the life, so the service life can be extended.
Feature:
1.Superior uniformity and EV grade safefty LFP battery ;
2.Customized modular and large-scale ESS solution;
3.Reliable safety design and remote real-time monitoring;
4.High cost effective and short delivery duration.
mwh ,ess container, bess, commercial battery,battery container,mega,megawatt,Marine battery
Shenzhen Enershare Technology Co.,Ltd , https://www.enersharepower.com