Key technologies for achieving high performance
Spectral matching design: Using a combination of multi band LEDs (such as ultraviolet, visible light, and near-infrared), optical filtering and mixing techniques are used to highly match the output spectrum with the AM1.5G standard solar spectrum, ensuring that the irradiance error of each band is less than 5%. For example, by adjusting the power ratio of red, green, and blue LEDs, the spectral distribution of the visible light band of the sun can be accurately reproduced.
Optimization of spatial uniformity: Using non spherical lenses or integrating spheres for secondary optical design of LED light sources to eliminate hotspots and dark areas. For example, by using a honeycomb integrated cavity structure, the uniformity of irradiance within the test surface can be better than 98%, meeting the requirements of IEC60904-9 standard.
Dynamic response control: Integrating high-speed driving circuits and closed-loop feedback systems to achieve millisecond level light intensity adjustment (such as completing 10% -90% light intensity switching within 10ms), meeting the dynamic testing requirements of photovoltaic modules. For example, real-time correction of LED driving current through PID algorithm ensures that the fluctuation of light intensity is less than 0.5%.
Reliability verification method
Accelerated life test: Run continuously for 1000 hours in a high temperature and high humidity environment of 85 ℃ and 85% RH, monitor the LED light decay rate (such as<5%) and the stability of the driving circuit, and verify the weather resistance of the equipment. For example, using the AgingTest system to record color temperature drift ensures spectral stability after long-term use.
Repeatability verification: Conduct 100 consecutive measurements on the same test point, calculate the standard deviation of irradiance (e.g.<0.2%), and verify the consistency of equipment output. For example, data can be collected using a spectral radiometer to analyze whether light intensity fluctuations meet the repeatability requirements of IEC60904-2.
Actual scenario simulation: Compare test data (such as I-V curves of photovoltaic modules) in a real outdoor sunlight environment to verify the equivalence between the simulator and natural light. For example, compare the test results of the simulator with the data from a standard solar tester to ensure that the conversion efficiency error is less than 1%.
By implementing and verifying the above technology, it can ensure that the LED solar simulator meets international standards in core performance indicators such as spectral accuracy, spatial uniformity, and dynamic response, while ensuring long-term reliability of the equipment through rigorous environmental testing.