We often appear this kind of problem in the application of led, led welding on the product in the beginning was that the normal work, but to
light after a period of time will appear dim light, flashing, fault, the phenomenon such as intermittent bright, bring serious harm to the product.
Application products, welding process has a problem, such as welding temperature welding time is too long, not to do a good job of anti-static, etc. , these problems caused by more than 95% is encapsulation process.
The LED itself quality or production process.
Preventive methods are as follows: 1.
Prepare welding process control.
2.
Aging test on products.
Aging is an important guarantee of electronic product reliability, is an essential part of production at the end of the step.
LED products after aging can improve efficiency and help to late use efficiency and stability.
LED aging test in product quality control is a very important link, in many cases, but often overlooked, unable to properly aging effectively.
LED aging test is based on product failure rate curve is a response to the characteristics of bathtub curve, in order to improve the reliability of products, but this method is not required, aging test, after all, at the expense of the single life at the cost of LED products.
LED aging methods include constant current aging and constant pressure aging.
Constant current source is refers to the current is constant at any time.
Have the problem of frequency is not constant current.
It is communication or pulsating current.
Communication or pulsating current source can be designed to RMS constant, but the power supply cannot be called 'constant current source'.
LED constant current aging is the most accord with current work characteristic, is the most scientific way of LED aging;
Over current impact aging is also an aging method that is used by the manufacturer to the latest through the use of adjustable frequency, current adjustable constant current source for such aging, in order to judge the quality of the LED in a short time, life expectancy and can pick a lot of normal aging can't pick out the hidden trouble of LED.
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