First, the status LED North American standards
LED energy-saving lamps, as a new product, the current North American product safety standards do not specifically for this type of technology requirements, testing of LED products become a topic in the industry. UL laboratory for the current industry conditions, is organizing the preparation of the LED energy-saving lamps safety certification standards UL8750, this standard is still draft, was not formally adopted as the certification standards. Thus, the certification testing of the LED energy-saving lamps, for the time being has not been completely resolved.
The basic principles of the LED energy-saving lamps through a switching power supply module of the AC power into DC power supply to the light-emitting diodes. According to the basic principles and structural features of the high power led energy-saving lamps, MET Laboratories, a current transition detection scheme: the traditional energy-saving lamps U.S. certification standards UL1993 (corresponding to the Canadian standard CAN/CSA-C22.2No.0 the CAN / the CSA-C22.2No.74), and power module standard UL1310 Design refer to UL1012 (corresponding Canadian Standards CAN/CSA-C22.2No.107) testing and certification of LED energy saving lamps.
Two detection techniques
The following key issues in accordance with UL1993, UL1310 and UL1012 standards, certification testing of the LED energy-saving lamps do
More elaborate.
A. Material
LED Blue 150W energy-saving lamps can be made into various shapes, fluorescent tubes, LED energy-saving lamps, for example, its shape is like an ordinary fluorescent tube, power supply module and the light-emitting diode package in which the fluorescent tube transparent polymer shell. Transparent polymer shell products play a fire and electric shock. The shell material according to the standard requirements, energy-saving lamps are required to reach the V-1 grade or more, so the transparent polymer shell to be used more than the V-1 rating materials. The point to note is that the product enclosure to meet the requirements of the V-1 rating, its thickness must be greater than the thickness of the V-1 rating equal to the raw materials required fire rating and thickness requirements can check on the raw materials, UL Yellow Card to. Found in the actual testing, the manufacturer in order to ensure the brightness of the LED strip lights , often transparent polymer shell very thin, which requires test engineers to pay attention to ensure that the materials to achieve the required fire rating thickness. Since different materials have different thickness of the same fire rating requirements, certain raw materials in a smaller thickness to meet the higher fire rating requirements, recommended that manufacturers can select the appropriate raw materials for products shell.
Two. Drop test
Product standards and product to drop the case for the drop test simulation that may occur during the actual use, the product from the height of 0.91 meters high fell to the hardwood panel product shell can not be broken as well as exposing the internal hazardous live. Manufacturers to choose the material of the product casing, to consider the strength requirements
3. Electric strength
Transparent shell surrounded by power supply module in-house, the transparent casing material must meet the electric strength. Standards, based on the conditions of the North American voltage of 120 volts, internal high-voltage live parts and the shell (covered with metal foil test), to be able to withstand 1240 volts AC electric strength test. Under normal circumstances, the product shell thickness of 0.8 mm, can meet the requirements of this electric strength test.
4. Power supply module
The power module is an important part of the LED 200W energy saving lamp, power supply module using a switching power supply technology. According to the different types of power supply module, you can consider using different standards for testing and certification. If the power module is classII power supply, use UL1310 testing and certification. the classII power isolation transformer, the output voltage is lower than DC 60 V, current less than 150/Vmax amp power. Non-classII power, is used to UL1012 testing and certification. The technical requirements of these two standards are very similar to cross-reference. Most LED lights internal power supply module is the use of non-isolated, associated power supply, power supply output DC voltage greater than 60 volts, NA UL1310 standards, and applicable UL1012
5 Insulation requirements
LED energy-saving lamps internal space is limited in the structural design, to pay attention to hazardous live parts with insulation can touch the metal parts. Insulation space distance and creepage distances can also be insulating film. Standards, hazardous live parts and accessible metal space distance of 3.2 mm and creepage distance of 6.4 mm. If the distance is not enough, the insulating film can be added as additional insulation, the insulation thickness is greater than 0.71 mm, thickness of less than 0.71 mm, the products will have bearing 5000V high voltage testing.
6. Temperature rise test
One will do the project, the temperature rise test product safety testing standards for the different components, the temperature rise limit. In the product design stage, manufacturers should attach great importance to the heat dissipation problem, in particular, should pay special attention to certain components (such as insulating films, etc.).
Components if the long-term work in high temperature conditions, easily damaged, resulting in fire or electric shock. Lamps inside the power supply module is closed in a confined space, heat dissipation is limited. Therefore, the manufacturer of the component selection, pay attention to select the appropriate component specifications to ensure that the components work in a certain margin, thus avoiding the components under the conditions close to full for a long time to work arising from overheating.
7. Structure
LED 400W energy saving lamp power supply module is installed inside the shell, space is limited, some manufacturers in order to save space, pin type surface of the component is soldered on the PCB, this practice is unacceptable. Welding the pin element of these surfaces is likely due to loss of Weld and other reasons, dangerous. Therefore, these components as possible to take the jack welding. If you had to take the surface welding, should these pieces of components using the plus glue fixation provides additional protection.
8. Fault test
The failure of the product test is a test project that is essential in the product certification testing. This test project is on the line to short circuit or open some component failure that may occur in order to simulate the actual process of using, in order to assess the safety of the products in single fault condition. In order to meet this safety requirements to be considered in product design, product input and the appropriate fuse to prevent the output short circuit or an internal component failure occurs when the overcurrent causing fire hazard.
Third, the factory inspection
North American product certification to inspect factories, factory inspection, including its first factory inspection and follow-up examination. If the plant is the first time to apply for product certification in North America, will have its first factory inspection. The first factory inspection for the quality assurance system of the factory, the factory has perfect quality assurance system to ensure the quality of the product to be effective monitoring and assurance. If the plant has been established in accordance with ISO9000 standard quality management system, and passed the ISO9000 certification, and basically be able to meet for the first time the factory inspection management system requirements. If the plant is not passed ISO9000 certification, they have the raw material procurement, incoming inspection, inventory management, product design, engineering changes, production line testing, instrument calibration, and complaint follow-up, etc. have a clear program files and effective implementation. Follow-up examination is mainly for the structure of the product inspection and product testing and other aspects of the production line to ensure that the product structure and the certification approved sample for production line and production line testing. Manufacturers in product testing and certification must be in strict accordance with the structure and list of components of the certification approved sample for production, any changes must inform the certification body may be involved in product safety assessment. If necessary, you may want to re-testing and modification of the report. Product test reports on the production line test is explicitly requested, the manufacturer must be in accordance with the requirements of the relevant tests such as high-pressure testing, ground continuity testing.