RGBW White-Channel Emulation for Dynamic CCT Control
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Solution Overview
Problem
Existing RGBW fixtures require multiple SKUs due to different white LED CCTs, leading to high costs and limited post-installation CCT tuning capabilities, with previous methods complicating CCT correction and limiting saturated color mixing.
Innovation Solution
A system and method to configure and maintain White channel CCT by mixing Red, Green, Blue, and White light sources, using mathematical models to emulate color temperature, allowing a single multi-channel lighting unit to provide various CCT options and dynamic adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple SKUs with different white LED CCTs are provided, then different CCT options are available for customers, but manufacturing costs and SKU management complexity increase substantially
Solution Approach 1:
The lighting fixture is designed with a universal electronic board that can support multiple CCT options through software control rather than hardware variations. The same physical fixture can deliver different CCTs (e.g., 2700K, 3000K, 4000K) by adjusting the drive signals to the LED channels, eliminating the need for multiple SKUs with different hardware configurations.
Solution Approach 2:
The patent changes the operational parameters (drive signals, mixing ratios) of the LED channels to achieve different CCTs from a fixed hardware configuration. By dynamically adjusting the intensity ratios of red, green, blue, and white LED channels, the system emulates different color temperatures without requiring physical changes to the fixture or LED components.
2Adaptability or versatility
If previously installed RGBW fixtures use fixed CCT white LEDs, then the fixture structure is simple, but CCT tuning capability is limited or non-existent
Solution Approach 1:
The system transitions from a static fixed-CCT design to a dynamic可调 CCT system. The electronic board receives control signals that can adjust the CCT in real-time by modifying the drive ratios of the LED channels. This allows the fixture to adapt its color temperature dynamically based on user needs or environmental conditions.
Solution Approach 2:
The control system incorporates feedback mechanisms to maintain accurate CCT rendering during dynamic adjustments. The system monitors the actual light output and adjusts the drive signals accordingly to ensure the desired CCT is achieved, especially when mixing multiple LED channels together.
3Adaptability or versatility
If Red, Green, and Blue components are used to correct white LED CCT, then CCT adjustment is possible, but saturated color mixing becomes exceedingly complex
Solution Approach 1:
The patent segments the control into independent channels for red, green, blue, and white LEDs. Each channel can be controlled separately, and the system manages the complexity by processing each channel's contribution independently before combining them. This modular approach simplifies the overall control algorithm compared to managing all color mixing interactions simultaneously.
Solution Approach 2:
The system introduces an intermediary processing layer that handles the complexity of color mixing. Rather than directly managing all possible interactions between red, green, blue, and white channels, the control system uses intermediate calculations and lookup tables to determine the appropriate drive signals, simplifying the control logic while achieving accurate color mixing.
Data Source
AI summary
Correlated color control (CCT) of a white channel in a color changing lighting fixture is performed by mixing red, green, blue and white light sources. The CCT of the white channel configured or corrected and maintained even while mixing the white channel with the very color channels that are used to configure or correct it. A processing unit uses mathematical models of the light sources to emulate the color temperature of the white components. Using the mathematical models, an RGBW color mix is computed for the white channel alone. The resulting RGBW mix is then combined with levels of red, green and blue as selected by a user.