LED energy-saving lamps are a general term for the industry, and there are many subdivided products, such as LED street lamps, LED tunnel lamps, LED high bay lamps, LED fluorescent lamps and LED panel lamps. At present, the main market of LED energy-saving lamps has gradually changed from overseas to globalization, and export to overseas markets must pass the inspection, while the domestic LED energy-saving lamps specifications and standard requirements are becoming more and more strict, so certification testing has become the work of LED lamp manufacturers. focus. Let me share with you the 8 key points of LED energy-saving lamp testing standards:
1. Material
LED energy-saving lamps can be made into various shapes such as spherical straight tube type. Take straight tube LED fluorescent lamp as an example. Its shape is the same as that of ordinary fluorescent tube. in. The transparent polymer shell provides fire and electric shock protection in the product. According to the standard requirements, the shell material of energy-saving lamps must reach V-1 level or above, so the transparent polymer shell must be made of V-1 level or above. To achieve the V-1 grade, the thickness of the product shell must be greater than or equal to the thickness required by 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 order to ensure the brightness of LED energy-saving lamps, many manufacturers often make the transparent polymer shell very thin, which requires the inspection engineer to pay attention to ensuring that the material meets the thickness required by the fire rating.
2. drop test
According to the requirements of the product standard, the product should be tested by simulating the drop situation that may occur in the actual use process. The product should be dropped from a height of 0.91 meters to the hardwood board, and the product shell should not be broken to expose the dangerous live parts inside. When the manufacturer chooses the material for the product shell, he must do this test in advance to avoid the loss caused by the failure of mass production.
3. Dielectric 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 North American voltage of 120 volts, the internal high-voltage live parts and the outer casing (covered with metal foil for testing) must be able to withstand the electric strength test of AC 1240 volts. 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, and the power module mainly adopts the switching power supply technology. According to different types of power modules, different standards can be considered for testing and certification. If the power module is a class II power supply, this can be tested and certified with UL1310. Class II power supply refers to the power supply with isolation transformer, the output voltage is lower than DC 60V, and the current is less than 150/Vmax ampere. For non-class II power supplies, UL1012 is used for testing and certification. The technical requirements of these two standards are very similar and can be referred to each other. Most of the internal power modules of LED energy-saving lamps use non-isolated power supplies, and the output DC voltage of the power supply is also greater than 60 volts. Therefore, the UL1310 standard is not applicable, but UL1012 is applicable.
5. Insulation requirements
Due to the limited internal space of LED energy-saving lamps, attention should be paid to the insulation requirements between hazardous live parts and accessible metal parts during structural design. Insulation can be space distance and creepage distance or insulating sheet. According to the standard requirements, the space distance between hazardous live parts and accessible metal parts should reach 3.2 mm, and the creepage distance should reach 6.4 mm. If the distance is not enough, an insulating sheet can be added as additional insulation. The thickness of the insulating sheet should be greater than 0.71 mm. If the thickness is less than 0.71 mm, the product should be able to withstand a high voltage test of 5000V.
6. temperature rise test
Temperature rise test is a must-do item for product safety testing. The standard has certain temperature rise limits for different components. In the product design stage, the manufacturer should attach great importance to the heat dissipation of the product, especially for some parts (such as insulating sheets, etc.) should pay special attention. Parts exposed to elevated temperatures for extended periods of time may change their physical properties, creating a fire or electric shock hazard. The power module inside the luminaire is in a closed and narrow space, and the heat dissipation is limited. Therefore, when manufacturers select components, they should pay attention to selecting the specifications of suitable components to ensure that the components work with a certain margin, so as to avoid overheating caused by the components working under the condition of close to full load for a long time.
7. structure
In order to save costs, some LED lamp manufacturers solder the surface of the pin-type components on the PCB, which is not desirable. Surface-soldered pin-type components are likely to fall off due to virtual soldering and other reasons, causing danger. Therefore, the socket welding method should be adopted as far as possible for these components. If surface welding is unavoidable, the component should be provided with “L feet” and fixed with glue to provide additional protection.
8. failure test
Product failure test is a very necessary test item in product certification test. This test item is to short-circuit or open some components on the line to simulate possible failures during actual use, so as to evaluate the safety of the product under single-fault conditions. In order to meet this safety requirement, when designing the product, it is necessary to consider adding a suitable fuse to the input end of the product to prevent overcurrent from occurring in extreme situations such as output short circuit and internal component failure, which may lead to fire.
Post time: Jun-17-2022