Detection Techniques of LED energy-saving lamps in North America

Detection Techniques


Following on the basis of UL1993, UL1310 and UL1012 standards, energy-saving lamp LED key issues in certification testing, to do some elaboration.


1. Materials


LED energy-saving lamps can be made into various shapes to LED energy-saving fluorescent tube lights, for example, its shape as with an ordinary fluorescent tube, fluorescent tube by a transparent polymer casing and LED the power supply module in the interior. Transparent polymer shell fire and play in the product features against 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. It should be noted is that the product to achieve the required shell V-1 rating, its thickness must be greater than or equal to V-1 grade of raw materials required thickness, fire rating and the thickness of the raw materials required in the investigation UL yellow card to. Found in actual testing, the manufacturer in order to ensure the brightness of LED lights, tend to do very thin transparent polymer shell, which requires test engineers to pay attention to ensure that materials meet the required fire rating thickness. As different raw materials to the same fire rating requirements of different thickness, the thickness of certain raw materials in smaller, under a high fire rating to meet the requirements, the manufacturer may choose to recommend the right materials to do the product exterior.


2. Drop test


By product standards, the product to simulate the actual use of the drop may occur during the drop test case for product fell from the height of 0.91 meters hardwood board, the product can not be broken as well as housing the danger of exposed live parts inside. Product manufacturers to choose the material of housing, the need to consider the strength requirements.


3. Dielectric Strength


Surrounded by a transparent shell inside the power supply module, transparent shell material must be required to achieve the electric strength. Accordance with the standard requirements, based on the conditions of the North American voltage of 120 volts, the internal high-voltage live parts and case (covered with foil to test), to be able to withstand 1240 volts AC electric strength test. Under normal circumstances, the product of about 0.8 mm shell thickness, to be able to meet the electric strength test requirements.


4. Power Module


LED power supply module is an important component of energy-saving lamps, power supply modules mainly in switching power supply technology. Press the power module types, consider using a different testing and certification standards. If the power module is classII power, which can be used to test UL1310 certification. classII power is the use of isolation transformer, the output voltage falls below 60 volts DC, power supply current of less than 150/Vmax amps. While the non-classII power is applied to test UL1012 certification. The technical requirements of these two standards are very similar, can cross-reference. Most of the internal power LED light module is associated with non-isolated power supply, power supply output voltage is greater than 60 volts DC, so do not apply UL1310 standards, and applicable to UL1012.


5. Insulation requirements


LED energy-saving lamps inside the limited space in the structural design, pay attention to hazardous live parts and metal parts can be touched between the insulation requirements. Insulation can be a space distance and creepage distance, it can be insulating film. Accordance with the standard requirements, hazardous live parts and metal parts can be touched between the distance to 3.2 mm creepage distance is 6.4 mm. If the distance is not enough, you can add insulation film as additional insulation, insulation thickness is greater than 0.71 mm, if the thickness of less than 0.71 mm, the product will have to be bearing 5000V high voltage tests.


6. Temperature rise test


Temperature rise test is a necessary product safety testing a project, the standard of the different components have a certain temperature limits. In the product design phase, manufacturers should attach great importance to the heat dissipation problem, especially for certain components (such as insulating films, etc.) should pay particular attention.


Components if long-term work in high temperature conditions, easily damaged, resulting in fire or electric shock. Lamp power supply module is enclosed within a small space, heat dissipation is limited. Therefore, the component manufacturer selection, pay attention to choose the right component specifications, to ensure a certain margin components to work, thus avoiding long-term components under conditions close to work full overheating.


7. Structure


LED energy saving lamp power supply module installed inside the housing, space is limited, some manufacturers in order to save space, the surface of pin components soldered on the PCB, this is not acceptable. The welding of the pin surface-elements are likely to fall off the Weld and other reasons, dangerous. Therefore, to the extent possible, these components welding jack. If you had to take the surface of welding, will have to use these pieces and glue fixation devices provide additional protection.


8. Fault test


Failure of the product certification testing is a crucial test in the test project. This test is on the line short-circuit or open a number of components, to simulate the actual use of the process failures that can occur, in order to assess products in a single fault conditions of security. In order to meet the safety requirements of the product design, consider the input in the product plus the appropriate fuses to prevent the output short circuit or an internal component failure occurred resulting in the current fire danger.

Second, the factory inspection


North American product certification to factory inspection, factory inspection, including the first factory inspection and follow-up examination. If the plant is the first for a North American product certification, will have to be the first factory inspection. The first factory inspection mainly for factory quality assurance system, and asked the factory has perfect quality assurance system to ensure product quality and ensure effective supervision. If the factory has been established according to ISO9000 quality management system standard, and passed the ISO9000 certification, the first factory inspection can basically meet the requirements management system. If the plant did not pass the ISO9000 certification, they have the raw material procurement, incoming inspection, inventory management, product design, engineering changes, production line testing, instrument calibration, and follow up complaints procedures have clear documentation, and effective implementation. Follow-up inspection is the main structure for the product line product inspection and testing, to ensure the production line of product structure and the certification approved sample, and through related production line testing. Manufacturers products through testing and certification, the certification must be in strict accordance with the structure of the sample list of the products and components, any change may be involved in product safety assessment must inform the certification body. If necessary, you may want to re-test and report changes. Product testing report on the production line testing is a clear requirement, manufacturers must follow the requirements of the relevant tests, such as high pressure testing, ground continuity testing.