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.
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