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On the basis of the following UL1993, UL1310 and UL1012 standards, certification testing LED energy-saving lamps of the key issues , do some elaboration.
1 . Material
LED lamps can be made into various shapes to LED lamp , for example, with its shape , like an ordinary fluorescent tubes , fluorescent tube by a transparent polymer shell of the power module and the light-emitting diode package inside. Transparent polymer shell fire and electric shock function to play in the product . According to the standard requirements, energy-saving lamp housing material is required to achieve V-1 level above , and therefore must be transparent polymer shell V-1 grade or more materials used . The point to note is that the product enclosure to achieve the required level of V-1 , which must be greater than the thickness equal to the thickness of the raw materials required for V-1 rating , the fire rating and thickness requirements can be found on the UL Yellow Card raw materials . Found in the actual testing , the manufacturer in order to ensure the brightness of LED lights , often very thin transparent polymer shell , which requires test engineers taken to ensure that the thickness of the material to reach the required fire rating . Due to the different materials of the same fire rating requirements of different thickness , certain raw materials in smaller thickness to meet higher fire rating requirements , the manufacturer may choose to recommend suitable raw materials to make products shell .
2 . Drop Test
By product standards, product dropped to simulate actual situations that may occur during use as drop test , the product fell from a height of 0.91 meters tall hardwood board , as well as exposing the product casing can rupture the internal hazardous live parts . When selecting materials manufacturers to make products shell , we must consider the strength requirements.
3 . Dielectric strength
Transparent enclosure surrounded inside the power module , transparent shell material must meet dielectric strength requirements. According to standards based on conditions in North America between 120 volts , the internal high-voltage live parts and enclosure ( covered with metal foil test ) , to be able to withstand the electric strength test 1240 volts AC . Under normal circumstances, the product shell thickness of about 0.8 mm , which can meet the electric strength test requirements.
4 . Power Module
Power module is an important part of energy-saving LED lights , the main use of switching power supply module technology . Press the power module types, consider using different standards for testing and certification . If the power supply module is classII , which can be used to test UL1310 certification . classII power refers to the use of isolation transformer , the DC output voltage is below 60 volts, amps of power supply current of less than 150/Vmax . While the non- classII power is applied to test UL1012 certification . These two standards are very similar technical requirements , refer to each other . Most LED lights internal power module is associated with non -isolated power supply output DC voltage greater than 60 volts, therefore not applicable UL1310 standards, and applicable UL1012.
5. Insulation requirements
Due to the limited internal space LED energy-saving lamps in the structural design , pay attention to insulation requirements dangerous live parts and accessible metal parts between . Insulation can be a spatial distance and creepage distances , it can be an insulating film. According to standards , between hazardous live parts and accessible metal parts spatial distance to reach 3.2 mm creepage distances to reach 6.4 mm . If the distance is not enough, you can add insulation sheet as additional insulation , insulation thickness greater than 0.71 mm , if the thickness is less than 0.71 mm , the product will have to be able to order of the 5000V high voltage testing.
6. Temperature Test
Temperature test is a must-do item of product safety testing standards for different elements have certain temperature limits . In the product design stage , the manufacturer should pay great attention to the heat dissipation problem of products, especially for certain components ( such as insulation sheet , etc. ) should pay special attention . Parts if long-term work under high temperature conditions , easily damaged , resulting in fire or electric shock. Lamps internal power module is enclosed in a small space , cooling is limited. Therefore, manufacturers component selection , pay attention to choose the right component specifications , to ensure components work under certain margin in order to avoid long-term component of work under full load conditions close to overheating .
7 . Structure
LED energy saving lamp power supply module is installed inside the housing , limited space , some manufacturers in order to save space, the pin-type surface mount components on the PCB, this approach is not acceptable. These surface mount pins Weld -elements may be due to other reasons it off, dangerous. So for these elements to take Jack welding as possible. If you had to take surface welding , will have to add this piece using glue fixation devices provide additional protection.
8. Failure Test
Failure of the product testing is a vital product certification testing of a test project . The test project is shorted or open some of the elements on the line to simulate failures that may occur during the actual use of the product in order to assess the safety of a single fault condition . To meet this safety requirements , product design, to consider the input of the product plus the appropriate fuse to prevent internal component output short circuit or over current fault causing a fire hazard.
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 application in North America certification , the plant will have an initial inspection . First factory inspection focused on the quality assurance system of the factory, the factory has required a sound quality assurance system to ensure product quality and ensure effective supervision . If the plant has established a quality management system according to ISO9000 standards, and passed the ISO9000 certification , can basically meet the initial inspection of the factory management system requirements . If the plant is not passed ISO9000 certification, will have the raw materials 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 inspection is the main structure for the product inspection and product testing and other aspects of the production line to ensure consistency of product structure and certified sample production line , and through the relevant production line test. After the product manufacturer through testing and certification , must strictly follow the structure and components of the samples were certified list of products , and any changes may involve product safety certification organization must notify assessed . If necessary , you may want to modify and re- test report . Product test reports on the production line where the product is a clear test requirements , manufacturers must be related tests , such as high-pressure testing, ground continuity testing as required .
Three , LED status of the North American standard
LED lamps as a new product , currently existing North American product safety standards are not specifically targeted technical requirements for such products , LED products become a test subject in the industry. American UL laboratory for the current situation of this industry , is organizing the preparation of LED energy saving lamp safety certification standards UL8750, this standard is still a draft, has not been officially adopted as the certification standards. Thus, the certification test questions LED energy-saving lamps , temporarily not been completely resolved.
The basic principle of LED energy saving lamp is converted to AC power by switching DC power modules to supply power to the light emitting diode work . According to the basic principles and structural features LED energy-saving lamps , the United States MET Laboratories detection scheme proposed a transitional stage : the traditional energy-saving lamps American certification standards UL1993 ( corresponding Canadian Standards CAN/CSA-C22.2No.0, CAN / CSA-C22.2No.74), and power modules standard UL1310 or UL1012 ( corresponding Canadian Standards CAN/CSA-C22.2No.107) LED energy-saving lamps for testing and certification .

China LED light--Alite co.,Ltd.http://www.aliteled.com
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