Solar Cell Aging Test Using Restricted Wavelength LED Irradiation
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Solution Overview
Problem
Existing methods for testing solar cells for aging resistance are limited in their ability to accurately determine early indicators of degradation due to high heat input from lighting and limited adjustability of light intensity, leading to imprecise detection of age-related degradation phenomena.
Innovation Solution
A method and device utilizing an LED lighting unit with a planar light source and adjustable temperature control to subject solar cells to accelerated aging through restricted wavelength ranges, allowing for sensitive detection of early indicators of degradation, with independent control of light intensity, temperature, and power input.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If halogen or xenon lighting is used to test solar cells for aging resistance, then the solar cells can be subjected to light exposure and heating, but a large amount of heat enters the solar cells due to the high proportion of IR radiation, making it difficult to adjust light intensity precisely
Solution Approach 1:
The patent changes the spectral parameters of the light source by using LED arrays with different wavelength characteristics. The first LED group emits in a wavelength range that induces aging effects, while the second LED group emits in a wavelength range that minimizes heat input, allowing independent control of light intensity and temperature parameters
Solution Approach 2:
The lighting system is segmented into multiple LED groups with different wavelength characteristics. This segmentation allows the system to separately control the aging-inducing light component and the heat-generating infrared component, enabling precise adjustment of light intensity without proportionally increasing heat input
2Illumination intensity
If halogen or xenon lighting is used for aging testing, then light exposure can be provided, but the light intensity can only be adjusted to a small extent or only with great design effort
Solution Approach 1:
The patent implements dynamic control of light intensity by independently adjusting the activation and intensity levels of different LED groups. This dynamic control system allows flexible adjustment of light intensity without requiring complex mechanical or optical design modifications
Solution Approach 2:
The system changes the operational parameters of the LED arrays, specifically controlling the current and activation state of individual LED groups to achieve precise light intensity adjustment. This parameter-based control is simpler than mechanical adjustment mechanisms
3Measurement precision
If broad spectrum lighting is used for aging testing, then comprehensive light exposure is provided, but early indicators for degradation can only be determined very imprecisely or not at all
Solution Approach 1:
The patent applies local quality by using specific wavelength ranges from LED groups that are optimized for detecting particular degradation indicators. Different LED groups emit in wavelength ranges that correspond to specific degradation mechanisms, allowing precise detection of early indicators without the interference present in broad spectrum lighting
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables high-sensitivity detection of early indicators of aging-related degradation, minimizing heat input and allowing precise quantification of solar cell performance changes, distinguishing susceptible cells from less susceptible ones, and simulating natural environmental conditions.
Implementation Method 1
The lighting is provided with the help of an LED lighting unit, which is designed as a flat light source, i.e. as an array of LEDs
Implementation Method 2
the solar cells or solar modules are subjected to accelerated aging in a test chamber in one or more successive aging phases by external influences
Data Source
Figure 1
AI summary
The present invention relates to a method and a device for testing solar cells or solar modules with regard to their resistance to aging, in which the solar cells (4) or solar modules are subjected to accelerated aging in a test chamber (5) in one or more successive aging phases and in one or more measurement phases a measurement of at least one parameter of the solar cells (4) or solar modules is carried out in the test chamber (5) by which an aging of the solar cells (4) or solar modules or at least one component thereof can be quantified.During one or more measurement phases, the solar cells (4) or solar modules are irradiated only with optical radiation from one or more first wavelength ranges, which are restricted compared to a sensitive wavelength range of the solar cells (4) or solar modules and in which an aging effect of interest in the solar cells (4) or solar modules, or in the component of the solar cells (4) or solar modules, can be detected with the highest sensitivity based on the measured parameter. By illuminating the solar cells (4) or solar modules with a specifically selected restricted wavelength range during the measurement phases, early indicators of aging can be detected with higher sensitivity.