Industry news

2016August

Common causes and protection scheme of LED lamp damage

From: www.szbako.com Data:31/08/2016

one is over electric shock, LED is applied on the current over the LED technical data manual in the maximum rated current, including overvoltage caused by over electric shock; the other is overheating damage. These damage can be shown as the immediate failure of the device, it may also occur in the event of a current impact after a long time before the failure to shorten the working life of LED.

high power white LED as a new green lighting technology, has the advantages of high efficiency, low energy consumption, long life, no maintenance, etc., has gradually been applied to a variety of lighting. The long life of LED is based on the safety of the working environment, for lighting LED , there are two threats affect their life: one is the electric shock is applied on the LED current exceeds the maximum rated current of the LED technical data manuals, including the overvoltage caused by electric shock; another is overheating damage. These damage can be shown as the immediate failure of the device, it may also occur in the event of a current impact after a long time before the failure to shorten the working life of LED.

LED lamps damaged the reason

LED lamps failure one is from the power and drive failure, two is derived from the failure of the LED device itself. Usually LED power and drive the damage from the input power of the over electric shock (EOS) as well as the load side of the circuit fault. The power supply of the input power is often caused by the damage to the driver chip, and the passive components such as capacitors, etc.. The short circuit fault of the load side may cause the driving circuit of the drive circuit, the drive circuit is likely to have short circuit damage or short circuit fault caused by overheating damage.

LED the device itself failure mainly has the following several:

1. transient transient flow event

2. electrostatic discharge events

LED performance will be reduced PN junction array or damaged, as shown in figure 2. ESD event discharge path led to the internal failure of the LED chip, this failure may be only a partial function damage, serious words will also cause permanent damage to the LED. Figure 2:LED part of PN junction damage.

for nearly 80% of the energy is converted into heat for LED lighting design, thermal management and thermal protection is a challenge to the thermal protection. Theory and practice have proved that the performance and life of LED is closely related with the work of PN junction temperature of LED. When the LED chip junction temperature rise of 10 degrees Celsius, the flux will decay in 1%, life will be reduced by 50% LED.

RELATED NEWS