Variable CCT Lighting Fixture Driver Module
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Solution Overview
Problem
Current lighting fixtures using LEDs lack the ability to provide white light over an extended range of correlated color temperatures, limiting their adaptability to various environmental conditions and user preferences.
Innovation Solution
A lighting fixture with a driver module that controls at least three LEDs with different color points on the CIE 1976 chromaticity diagram, allowing for adjustable correlated color temperature and dimming levels by varying the currents to these LEDs, ensuring the light emitted falls along a black body locus and within specific MacAdam ellipses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If traditional LED lighting fixtures use a single LED type or limited LED combinations, then the device complexity is reduced, but the ability to provide white light over an extended range of correlated color temperatures is limited
Solution Approach 1:
The lighting fixture segments the white light generation into three distinct LED types with different color points (first wavelength converted LED, second wavelength converted LED, and third LED). Each LED type contributes differently to the spectral composition, enabling independent control of color temperature through the driver module by adjusting the current ratio to each LED type.
Solution Approach 2:
The driver module dynamically changes the operating parameters (current levels) of each LED type to adjust the correlated color temperature. By varying the current ratios to the first, second, and third LEDs, the system can produce white light across an extended CCT range while maintaining color quality within MacAdam ellipses.
2Adaptability or versatility
If the lighting fixture uses multiple LEDs with different color points to achieve extended CCT range, then the adaptability to environmental conditions improves, but the manufacturing precision requirements increase
Solution Approach 1:
Each LED type is selected with specific color point characteristics (first color point, second color point, third color point) that are optimized for their respective roles in white light generation. The wavelength converted LEDs provide specific spectral components while the third LED complements the overall spectrum, with each component having localized quality requirements.
Solution Approach 2:
The driver module incorporates feedback mechanisms to monitor and adjust the output color temperature. By measuring the actual CCT and comparing it to the target value, the driver module can dynamically adjust the current ratios to maintain color quality within MacAdam ellipses, compensating for manufacturing tolerances and LED aging.
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 the production of white light with adjustable color temperature from 2700 K to 5700 K, maintaining desired color quality and intensity across different conditions, enhancing user flexibility and environmental adaptability.
Implementation Method 1
The lighting fixture has a driver module configured to drive at least three LEDs. The three LEDs include: at least one wavelength converted LED of a first color, at least one wavelength converted LED of a second color, and at least one LED of a third color
Implementation Method 2
at least one wavelength converted LED of a first color with a first color point on a CIE 1976 chromaticity diagram, at least one wavelength converted LED of a second color with a second color point on the CIE 1976 diagram
Implementation Method 3
The driver module is configured to provide the first, second, and third currents such that light emitted from the at least one wavelength converted LED of the first color, light emitted from the at least one wavelength converted LED of the second color, and light emitted from the at least one LED of the third color combine to form white light with a color point that falls along a black body locus
Data Source
AI summary
The present disclosure relates to a lighting fixture that is capable of providing white light over an extended range of correlated color temperatures.