First, the status LED North American standards
LED lights 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 light 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 LED energy-saving lamps, MET Laboratories, a current transition detection scheme: the traditional energy-saving lamps U.S. certification standards UL1993 (corresponding Canadian Standards CAN/CSA-C22.2 No. 0, the CAN / CSA-C22.2 No. 74), and the power module standard UL 1310 or UL 1012 (corresponding to the Canadian Standards CAN/CSA-C22.2 No.107) testing and certification of LED energy saving lamps.
Two detection techniques
Following some elaborated according to UL1993, UL 1310 and UL 1012 standard, the key issues in the certification testing of the LED energy saving lamps do.
1 Materials
led power 50w 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 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.
(2) 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 select materials when making products shell, we must consider this strength requirement.
(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 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 a class II power supply, use UL1310 testing and certification. class II power supply with isolation transformer, the output voltage is lower than DC 60 V, current less than 150/Vmax amp power. On the power of non-class II, is used to UL1012 testing and certification. The technical requirements of these two standards are very similar to cross-reference. Most led driver 120w 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 Light 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 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. LED Spotlight 30W 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 Flood light 10W 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 Testing
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.