Tapered Bore Self-Aligning Spher,Spherical Roller Bearing,Roller Bearing Fenghua Jade Motor Co., Ltd. , http://www.gosbearing.com
The reason for the damage of LED lamps in China Building Materials Network is that the failure of LED lamps comes from the failure of power supply and drive, and the failure of LED devices themselves. Often the damage to the LED power supply and drive comes from the over-current surge (EOS) of the input supply and the open-circuit fault at the load. The over-current shock of the input power source often causes damage to the driver chip in the driver circuit and breakdown damage of passive components such as capacitors. A short-circuit fault at the load end may cause over-current drive of the drive circuit, and the drive circuit may be damaged by short-circuit or short-circuit fault. There are several main reasons for the failure of the LED device itself. A transient overcurrent event is when the current flowing through the LED exceeds the maximum rated current in the LED technical data sheet. This may be due to a large current directly generated or indirectly generated by a high voltage, such as a transient lightning strike or a switching power supply. Overcurrent caused by overvoltage events such as state switching noise and grid fluctuations. These events are transient and have a very short duration. Usually we call them spikes such as current spikes and voltage spikes. The transient overcurrent event also includes the LED being powered on or the transient overcurrent when plugged in. For LED lighting in cars, the transient load dump surge of ISO7637-2 is an important threat to its normal operation. The failure mode of an LED after an electrical shock is not fixed, but it usually causes damage to the weld line, as shown in Figure 1. This damage is usually caused by a very large transient overcurrent. In addition to causing the weld line to blow, it may also cause damage to other parts of the weld line, such as sealing material.