LED has unique advantages, but LED is a fragile semiconductor product, so we must be careful when using LED products. This article will summarize some precautions in LED design and application for everyone, which must be attached great importance to.
#1 Should Be Powered By A DC Power Supply
In order to reduce the cost of products, some manufacturers use the method of “resistance-capacitance step-down” to supply power to LED products, which will directly affect the life of LED products. Using a dedicated switching power supply to power LED products will not affect the service life of the product, but the product cost is relatively high.
#2 Anti-static Measures Need To Be Taken
Certain anti-static measures must be taken during the processing and production of LED products, such as grounding of the workbench, anti-static clothing, anti-static rings and anti-static gloves for workers, etc. Anti-static ion fans can be installed if conditions permit. It is also necessary to ensure that the humidity in the workshop is around 65%, so as to avoid static electricity caused by too dry air, especially green LEDs are more likely to be damaged by static electricity.
Many electrostatic problems are caused by people’s lack of ESD (electrostatic discharge) awareness. This is because most ESD damage occurs outside the human senses, because the human body’s perception voltage of electrostatic discharge is about 3KV, and many electronic components operate at a few It will be damaged at hundreds of volts or even tens of volts. Usually, there is no obvious boundary after the electronic device is damaged by ESD. After installing the component on the PCB and then testing it, many problems appear as a result, and the analysis is also quite difficult.
#3 LED Temperature
It should be noted that the increase in temperature will make the internal resistance of the LED smaller. When the external ambient temperature rises, the internal resistance of the LED light source will decrease. If a regulated power supply is used for power supply, the LED operating current will increase. When the rated operating current exceeds its rated operating current, it will affect the service life of the LED product. The 80w-150w Plug-In Mobile Emergency Portable Working Light source is “burned out”, so it is best to use a constant current source for power supply to ensure that the working current of the LED is not affected by the external temperature.
#4 The Sealing Of LED Products
No matter what kind of LED products, as long as they are used outdoors, they are faced with waterproof and moisture-proof sealing problems. If they are not handled properly, they will directly affect the service life of LED products. At present, a small number of manufacturers with high product quality requirements adopt the traditional epoxy resin “watering” method to seal LED products. This method is cumbersome to operate, and it will also increase the product weight for larger LED products. .
#5 The LED Current Cannot Exceed The IF Current Of The LED
Over-current work will reduce the life of the LED quickly, and if it exceeds, the LED will be burned out immediately.
#6 Attention Should Be Paid To LED Corners
When the LED is bent or bent, please do not get too close to the colloid, and keep a distance of more than 2mm from the colloid, otherwise the bracket inside the LED colloid will be separated from the gold wire. 90 degrees, and then return to the original position for 1 time.
#7 Soldering Temperature
The welding temperature is about 260 degrees Celsius, the time is controlled within 5 seconds, the welding point is more than 2.5mm away from the bottom of the colloid, the electric soldering iron must be grounded, and live welding of LEDs is absolutely not allowed.