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Reason and Countermeasure of LED torch with three kinds of suspended animation


LED torch with to feign death phenomenon LED (LED is not lit) will appear in the production process, this phenomenon in 5050 CREE flashlight with the most easy. The reasons for this phenomenon are the following:



1, the electrostatic burn out


LED is a static-sensitive components and, therefore, did not do a good job in the production process for electrostatic protection work, it will because of the electrostatic burn LED chip, resulting in suspended animation occurs with LED torch.


Measures to prevent this phenomenon occurs is to strengthen the electrostatic protection, all contact with LED employees must be worn in accordance with the provisions of the anti-static gloves, a wrist strap, tools and equipment must be well grounded.


2, the high-temperature damage


LED high temperature performance is not good, therefore, in the production and maintenance process for LED soldering temperature and time have no control, will cause damage to LED chip, LED torch with ultra-high temperature or continuous high temperature The phenomenon of suspended animation.


Measures to prevent the occurrence of this phenomenon: the good reflow soldering iron temperature control, the implementation of the person responsible, specialized records management; soldering iron temperature control soldering iron, effectively prevent the soldering iron high temperature burn LED chip.


3, the moisture under high temperature burst


LED package will absorb moisture when exposed to air for a long time before use, if not after the dehumidification process, over the time of reflow will reflow temperature is too high, the time period is long and the thermal expansion of LED torch package of moisture, causing LED packaging burst, thereby indirectly lead to LED chip overheating and damage.


The solution: LED flashlight storage environment to temperature and humidity, not finished using LED must be placed before the next use 6 to 8 hours baking in the oven at about 80 ° dehumidification process to ensure that the use of LED flashlight there will be no moisture absorption phenomena.

Hits:  UpdateTime:2012-11-06 08:38:22  【Printing】  【Close