When the LED lamp is difficult to light, sometimes touch the LED lamp tube can light or light rolling, this may be C3, C4 capacity is insufficient, not paired. If a single small power energy-saving lamp lit after the filament red or luminous phenomenon, should also check WHETHER D1 — D4 soft breakdown, C1 is installed or leakage, power supply part without short circuit. The cores of choke L and oscillating transformer B are broken. If you change cores only, there are three things to note. Use the magnetic core that meets the requirements, otherwise it may make the inductance value of choke have a big difference, bury hidden trouble to energy-saving lamp; Magnetic gap can not be too small, so as to avoid magnetic saturation.
The light-emitting principle of led can also be explained by the band structure of PN junction. The material of semiconductor light-emitting diode is mixed with impurities. Under the state of heat balance, there are many electrons with strong mobility in the N region, and more holes with weak mobility in the P region. Due to the limitation of PN junction barrier layer, the two can not recombine naturally under normal conditions. When the positive voltage is applied to the PN junction, the electrons can absorb the energy of qVbi and become the electrons in the high energy state, thus breaking the barrier of PN junction and entering the side of the P region.
First of all, the heat dissipation of LED lights is a technical problem, if there is no good heat dissipation device, the service life of LED lights will be shortened. And, the working voltage of LED lamp is generally 12V or 24V, the working current is generally 15~20mA, too low can not reach the required brightness, too high is easy to make the bulb due to overheating and aging. Secondly, LED lights have strict requirements on the environment, a little dust will let the circuit board damage. Many businesses in the production process is difficult to meet the requirements of the dust-free workshop, so there will be dust sealed in the tube, leading to a shorter life of LED lights.
In terms of supporting services, LED display, as an important interactive hardware for information release and audience interaction, also needs to be equipped with corresponding software. According to Zhou Ming, the LED display terminal of Zhou Ming applied in the Qatar World Cup is also equipped with the self-developed display control operation and maintenance platform, realizing the intelligent remote control of playback, retransmission, interaction and other systems during the event.
Silicone, Compared with epoxy resin, silicone has higher cost performance, excellent insulation, dielectric property and cohesiveness. But the disadvantage is poor air tightness, easy to absorb moisture. Therefore, it is rarely used in the packaging application of LED display devices. In addition, high-quality LED display also put forward special requirements for the display effect. Some packaging plants use additives to improve the stress of the glue, while achieving the effect of matte fog.
The advantages of LED energy-saving lamps
Power supply 12V LED misused into 24V
LED detection process
The LED lights flickered.
When the LED lamp is difficult to light
LED lamps and ordinary energy-saving lamps
Promoting the use of LED bulbs
Generation of green light source LED
LED light source called longevity lamp
LED light source is low pressure microelectronics product