First, the status of LED North American standards
As a new type of product, the current North American product safety standard does not specifically address the technical requirements of such products. The testing of LED products has become a topic in the industry. For the current industry situation, UL Labs of the United States is organizing the preparation of LED lamp safety certification standard UL8750, which is still drafted and has not been officially adopted as the certification standard. Therefore, the certification test problem of LED energy-saving lamps has not been completely solved.
The basic principle of the LED energy-saving lamp is to convert the AC power to DC power through the switch-type power module to supply power to the LED. According to the basic principle and structural characteristics of LED energy-saving lamps, MET Labs of the United States proposes a transitional detection scheme at the present stage: the US certification standard UL1993 (corresponding to the Canadian standard CAN/CSA-C22.2 No. 0, CAN) /CSA-C22.2 No. 74), and the power module standard UL 1310 or UL 1012 (corresponding to Canadian standard CAN/CSA-C22.2 No.107) test and certification of LED energy-saving lamps.
Second, the technical points in the test
The following is a description of the key issues in the LED energy-saving lamp certification test based on UL1993, UL 1310 and UL 1012 standards.
LED energy-saving lamps can be made into various shapes. For example, fluorescent tube type LED energy-saving lamps have the same shape as ordinary fluorescent tubes, and the power module and the light-emitting diodes are enclosed by the tubular transparent polymer casing of the fluorescent lamp. The transparent polymer housing provides fire and shock protection in the product. According to the standard requirements, the energy-saving lamp housing material must be above the V-1 level, so the transparent polymer housing must be of V-1 or higher. It should be noted that the product casing must meet the required V-1 rating, and its thickness must be greater than or equal to the thickness required for the V-1 grade of the raw material. The fire rating and thickness requirements can be found on the UL yellow card of the raw material. . In actual testing, it was found that in order to ensure the brightness of the LED lamp, the manufacturer often made the transparent polymer casing thin, which required the inspection engineer to ensure that the material meets the required thickness of the fire rating. Since different raw materials have different thickness requirements for the same fire rating, some raw materials can meet higher fire rating requirements at a lower thickness. It is recommended that the manufacturer can select the appropriate raw material for the product casing.
2. Drop test
According to the requirements of the product standard, the product should simulate the drop test that may occur during the actual use, and the product should fall from the height of 0.91 m to the hard board. The outer casing of the product should not be broken to expose the dangerous parts inside. This strength requirement must be considered when the manufacturer selects the material for the product's outer casing.
3. Electric strength
The transparent casing encloses the power module inside, and the transparent casing material must meet the electrical strength requirements. According to the standard requirements, based on the condition of 120 volts in North America, the internal high-voltage live parts and the outer casing (tested with metal foil) should be able to withstand the 1240 volt AC resistance test. Under normal circumstances, the thickness of the product shell reaches about 0.8 mm, which can meet the requirements of this electric strength test.
4. Power module
The power module is an important part of the LED energy-saving lamp. The power module mainly uses switching power supply technology. Different types of power modules can be considered for testing and certification. If the power module is a class II power supply, this can be tested with UL1310. Class II Power supply is a power supply that uses an isolated transformer with an output voltage of less than 60 VDC and a current of less than 150/Vmax amps. For non-class II power supplies, UL1012 is used to test the certification. The technical requirements of these two standards are very similar and can be referred to each other. The internal power supply module of most LED lamps uses a non-isolated power supply. The DC output voltage of the power supply is also greater than 60 volts. Therefore, the UL1310 standard is not applicable, and UL1012 is applicable.
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