November 11, 2013 Thermal Management and Reliability Technology Branch, from the State Key Laboratory of Semiconductor Lighting R & D engineers Lu Guangjun made a presentation entitled "CSA020 indoor LED lighting products measured decay too fast reason analysis". report.
Lv Guangjun said: "Compared with the traditional lighting products, as the third generation of LED lighting products with energy saving and environmental protection, long life, safety, appearance and plasticity, flexible and easy to drive small size and many other advantages. LED industry and the current advocacy of all countries Therefore, it has obtained the strong support from governments of all countries, especially the applications related to public utilities (such as LED street lamp, etc.), which are developing rapidly. However, due to the constraints of cost and other factors, As a complete replacement of traditional lighting, it will take time, due to fierce market competition, product replacement fast, shorten the development time has become an urgent need for the industry.
Therefore, CSA020 "Accelerated Attenuation Test Method for LED Lighting Products" promulgated by National Semiconductor Lighting Project R & D and Industry Alliance Standardization Committee (CSAS) is mainly applicable to LED street lamp, LED tunnel lamp, LED spotlight, LED downlight and LED ball Bubble lights and other LED lighting products. "
The first is the acceleration principle of CSA020 accelerated decay test method is that under the premise of ensuring the accuracy of the test equipment, assuming the lumen maintenance and the time was exponential decay relationship, you can use 3600 hours luminous flux attenuation data to replace the ES test method required 6000 hours of data. In addition, the accelerated decay test method uses a number of proven Arrhenius acceleration models to demonstrate the lifetime of LED products at high junction temperatures, based on measured data. Therefore, this method further shortens the test time by increasing the ambient temperature at the time of the test (to increase the LED junction temperature). Under the recommended test temperature of 55 ° C, data up to 2000 hours can be used to replace 6000 hours of room-temperature data required by the ES method. LED lighting products with a maximum nominal operating temperature of less than 55 ° C require the highest rated operating temperature of the product to be the highest test temperature. The standard accelerated decay test method is feasible and reasonable, not only proved in theory, but also with the actual test data LED lighting was verified.
Followed by the CSA020 standard proposed inspection process is the use of sampling methods, which means that the test batch consists of: the same materials, components and light sources, and have the same structure, in the same production line for the production of continuous product inspection batch Times. The test samples shall be taken randomly from at least two manufacturing batches. The luminous flux of the sample should be consistent with stable attenuation.
Sample sample
In order to speed up the selection of the test temperature, the test chambers were sequentially set to the four test temperatures listed in Table 1, held at each test temperature for at least 60 minutes to bring the sample to a state of thermal equilibrium stability, measure the optical properties of the sample at that temperature Characteristics (such as illumination). After each measurement, the sample should be taken out of the temperature chamber, allowed to stand at room temperature, and the flux should be measured when the sample has reached a state of thermal equilibrium.
The difference between the luminous flux measured by the sample outside the temperature chamber shall be within 5% and the difference between the optical properties measured at the four set test temperatures in the chamber shall be within 10%, then This test temperature (except 25 ° C) can be reduced by 5 ° C as the accelerated test temperature for the accelerated decay test. Accelerated tests should be used to meet the above conditions, the maximum accelerated test temperature, but not higher than 55 ℃, and should not be higher than the nominal maximum operating temperature of the product.
Subsequent accelerated tests require the sample to measure the initial luminous flux. The sample is then placed in a test chamber for accelerated testing. The test ambient temperature is the above-mentioned accelerated test temperature, the relative humidity of the test environment does not exceed 65%, and the sample continuously operates at the rated voltage.
Accelerated test compliance was reached: The CSA cited compliance determinations for samples with nominal lifetimes of 25,000 hours, 30,000 hours, and 35,000 hours, respectively. Such as the nominal life of 35,000 hours of the sample at an accelerated temperature, all the samples to achieve the cumulative load time shown in Table 2, the accelerated lumen maintenance rate of not less than 95%, then determine the minimum life expectancy of the sample to its standard Life expectancy 35,000 hours. If the accelerated temperature is 55 ℃, LED lighting products are judged to be 35,000 hours of life, 30,000 hours and 25,000 hours required for the test time of only 1750 hours, 1550 hours and 1300 hours.
Finally, in order to verify CSA020 "accelerated degradation test method of LED lighting products" has a wide range of representative, in the downlights, spotlights, bulb, street and tunnel lights selected 17 kinds of representative LED lighting products were tested . The results of the accelerated decay test were verified to be consistent with the room temperature test results at 55 ° C accelerated and room temperature (25 ° C) tests. Compared with the US Energy Star ES method, CSA020 "Accelerated Attenuation Test Method for LED Lighting Products" can effectively shorten the test time required to predict the life of LED lighting products. The correctness and broad representation of the CSA020 test methodology has been extensively substantiated by data validation. Taking into account the accuracy of the measurement system, the method can be used to test the temperature at 55 ℃ test time will be shortened to 2000 hours.
Currently CSA020 is being received by the National Semiconductor Lighting Project R & D and Industry Alliance dozens of member units, I believe in the near future will be more and more enterprises recognized, will certainly LED lighting product development and industrial development played a huge role in promoting . The sample size is at least 3. The greater the number of samples, the higher the confidence of the test results.
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