January 27, 2021
Electrostatic protection in the manufacturing process of LED lamps
LED is a semiconductor device which is more sensitive to static electricity, especially for white, green, blue, and purple. For LED products, it is a core key component and the most easily damaged device. When we design and manufacture LED lighting products, we must protect the LED. LED lights must be protected from static electricity and work to eliminate static electricity.
Why should LED be protected?
If the LED is used normally, it has long life-service. However, in actual use, LEDs are often easy to be broken, in fact, they have not taken into account the characteristics of the use of LEDs and add protection circuits to them. LED is an optoelectronic semiconductor device, which is easily damaged by static electricity during the assembly process. This requires electrostatic protection during the assembly process. In actual work, the LED uses a current of 20mA as the upper limit, but the current will often increase due to various reasons in use. If no protective measures are taken, the increased current will exceed a certain time and amplitude after the LED Will be damaged.
The resistance of anti-static products and other appliances used in the working area of the electrostatic protection workshop of the LED production workshop may be greater than 109 after a period of time. In order to achieve the purpose of anti-static, it is recommended to create the following four basic conditions ,
1. To ensure the implementation of human protection measures;
2. To ensure the electrostatic protection of the production equipment in the workshop;
3. To strive to make the production workshop and surrounding environment meet the anti-static requirements;
4. To improve the system, formulate operating specifications, establish a strict internal audit system to ensure that the system is implemented and focus on the training of employees' electrostatic awareness; formulate technical standards for electrostatic protection products to ensure the quality of protection products. In terms of measurement and control methods, add temperature and humidity monitoring to the work area, record temperature and humidity every day; measure static voltage every month; check the surface resistance and friction voltage every time employees’ anti-static clothes and caps are washed; check the anti-static table mats every year Primary surface resistance. A comprehensive human body resistance tester is installed at the entrance of the workshop; The balance voltage and static electricity dissipation time of the ion fan shall be set up once a month. Please take appropriate precautions during the production process. The following is for reference only: It must be able to prevent static electricity generation: required by assembly personnel Wearing anti-static clothing (such as anti-static clothes, hats, shoes, finger cots, or gloves, etc.) must be able to quickly dissipate static electricity on the surface or inside: Assembly operators must wear anti-static wrist straps. (The wrist strap must be connected to the grounding system) Can provide shielding protection from sudden electrostatic discharge or electric field impact:
① The assembly table (workbench) needs to use an anti-static table mat and be grounded.
② An anti-static component box is required to hold LEDs.
③ The soldering iron, cutting machine, tin furnace (or automatic reflow soldering equipment) must be grounded. During the operation, avoid directly touching the pins of the luminous tube as much as possible, and touch the colloidal part as much as possible when picking and placing. Grounding measures should completely prevent the generation of static electricity. The grounding of the workbench, soldering iron, cutting machine, tin furnace (or automatic reflow soldering equipment) must be introduced into the soil with a thick iron wire, and a large iron block should be tied to the end of the iron wire. Buried below 1 meter of the ground surface, each ground wire must be connected to the main wire. If the electrostatic ring worn by the operator has a lead wire, the lead wire must also be connected to the buried wire. Semi-finished and finished testing equipment also need to be grounded. Use anti-static sponge or packaging for LED packaging bags and semi-finished packaging materials.