LED light detection points in North America

A, LED status LED lights standard in North America as a new product, now the current North American product safety standards do not specifically address the technical requirements of such products, LED products, the industry as a test subject. U.S. UL Laboratory for the current industry conditions, is organizing the preparation of LED lights ...A, LED status of the North American standard

More LED-related content, please visit: www.bgocled.comLED lights as a new product, now the current North American product safety standards do not specifically address the technical requirements of such products, LED products, the industry as a test subject. U.S. UL Laboratory for the current industry conditions, is organizing the preparation of LED light safety certification standards UL8750, this standard is still a draft, not being formally adopted as the certification standard. Thus, LED energy saving lamp certification test questions, not being completely resolved.
The basic principle of energy-saving LED lights by switching power supply module to the AC power into DC to power the light emitting diode. According to the basic principles of energy-saving LED lights and structural features, MET Laboratories, the U.S. proposed a transitional stage of the testing program: the use of traditional energy-saving lamps U.S. certification standards UL1993 (corresponding to the Canadian Standards CAN/CSA-C22.2 No. 0, CAN / CSA-C22.2 No. 74), and power modules standard UL 1310 or UL 1012 (corresponding to the Canadian Standards CAN/CSA-C22.2 No.107) of the LED lamps for testing and certification.
Second, the detection techniques
Following on the basis of UL1993, UL 1310 and UL 1012 standards, certification testing of LED energy saving lamps in the key issues, do some elaboration.
1 Materials
LED lamps can be made into various shapes, with fluorescent tube LED energy-saving lamps, for example, its shape, as with ordinary fluorescent tubes, fluorescent tube transparent polymer shell by the power module and the light-emitting diode package inside. Transparent polymer shell fire and play in the product's features electric shock. According to standards, energy-saving lamp shell material is required to achieve V-1 grade or more, so transparent polymer shell to be used more than V-1 grade material. Point to note is that the product enclosure to achieve the required level of V-1, its thickness must be greater than or equal to V-1 grade of raw materials to the required thickness, fire rating and thickness of the raw materials required in UL yellow card check to. Found in the actual testing, the manufacturer in order to ensure the brightness of LED lights, often very thin transparent polymer shell, which requires attention to ensure that materials testing engineers reached the required fire rating thickness. Since different materials have the same fire rating requirements of different thickness, some raw materials in smaller thickness to meet the higher fire rating requirements, recommended that manufacturers can choose the right materials to do the product casing.
(2) drop test
According to product standards, to simulate the actual use of the product may occur during the fall drop test case for the product fell from the height of 0.91 meters hardwood board, the product can not be broken shell as well as the risk of exposing the internal live parts. Product manufacturers choose to do shell material, the need to consider the strength requirements.
3 electric strength
Surrounded by a transparent shell in the power module inside the transparent casing material must meet dielectric strength requirements. According to standards, based on the conditions of the North American voltage of 120 volts, the internal high-voltage live parts and case (covered with foil test), to be able to withstand 1240 volts AC electric strength test. Under normal circumstances, the product shell thickness of about 0.8 mm, which can meet the electric strength test requirements.
4 power supply modules
LED power supply module is an important part of energy-saving lamp, power supply module of the use of switching power supply technology. Press the power module types, consider using different criteria for testing and certification. If the power supply module is a class II, which can be used to test UL1310 certification. class II power supply is the use of isolation transformer, the output voltage is less than 60 volts DC current is less than 150/Vmax amp power supply. The power of non-class II, is used to test UL1012 certification. The technical requirements of these two standards are very similar, can cross-reference. Most of the internal power supply LED light module is associated with non-isolated power supply, power supply output DC voltage greater than 60 volts, it does not apply UL1310 standards, and applicable to UL1012.
5 insulation requirements
Because LED lamps inside the limited space, the structural design, to pay attention to hazardous live parts and accessible metal parts between the insulation requirements. Insulation can be a distance and creepage distances, it can be insulating film. According to standards, hazardous live parts and accessible metal parts to distance between 3.2 mm and creepage distances to reach 6.4 mm. If the distance is not enough, you can add insulation film as an additional insulation, the insulation thickness is greater than 0.71 mm, if the thickness is less than 0.71 mm, the product will have to be bearing 5000V high voltage testing.
6 temperature test
Temperature rise test is a product safety testing must be done, standards for the different components have a certain temperature limit. In the product design stage, the manufacturer must pay great attention to the heat dissipation problem, especially for some parts (such as the insulation film, etc.) should pay particular attention.
Components if long-term work in high temperature conditions, easily damaged, resulting in fire or electric shock. Inside the lamp power supply module in a closed confined space, heat dissipation is restricted. Therefore, manufacturers component selection, we should pay attention to select the appropriate components of the specification, to ensure that components in a certain margin to work, thus avoiding long-term components under conditions of near full load of work arising from overheating.
7 Structure
LED lamps installed in the power module inside the housing, space is limited, and some manufacturers in order to save space, the surface of the pin-like components soldered on the PCB, this is unacceptable. The surface of the welded pin-type components are likely to fall off because Weld and other reasons, causing danger. So take these components as much as possible welding jack. If forced to take the surface of the welding, will have to glue these pieces plus a fixed component used to provide additional means of protection.
8 fault test
Failure of the product certification testing is critical to test a test project. This test project is on the line short or open some of the components, to simulate the actual process failures that may occur, in order to assess the product in a single fault conditions of security. In order to meet the safety requirements of the product design, consider the product plus the appropriate input fuse to prevent short circuits or internal components, output overcurrent faults resulting fire hazard.



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