Color-Tuning Device Selecting CCT and Duv via Segmented Voltage
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Solution Overview
Problem
Existing LED lighting systems struggle to effectively control both correlated color temperature (CCT) and distance to the black body line (BBL) in color-tuning applications, particularly in retail and hospitality settings, where a high color-rendering index (CRI) is desired, and current solutions fail to accurately manage these parameters to achieve the desired color appearance.
Innovation Solution
A color-tuning device, such as a dimmer, is designed to select both CCT and the distance to the BBL (Duv) using a finite-state machine algorithm and a 0-to-10 volt dimmer, allowing for precise control of LED color points to achieve a CRI of 90 or greater by adjusting the chromaticity coordinates of desaturated red, green, and blue LEDs to be in proximity to the BBL.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single color-tuning device is used to control both CCT and distance to BBL, then device complexity is reduced, but control precision deteriorates
Solution Approach 1:
The control range of the single device is segmented into multiple zones (first zone for CCT control, second zone for Duv control). The processor divides the dimmer's voltage range into distinct segments, each corresponding to a specific control function, allowing one device to perform multiple controlled operations without sacrificing precision
Solution Approach 2:
The control function of the device is dynamically adjusted based on its current position. As the dimmer slider moves through different voltage ranges, the system dynamically switches between CCT adjustment mode and Duv adjustment mode, enabling adaptive control that maintains precision across different operating parameters
2Measurement precision
If multiple control devices are used for CCT and Duv, then control precision is improved, but device complexity increases
Solution Approach 1:
Two separate control functions (CCT adjustment and Duv adjustment) that traditionally required separate devices are merged into a single dimmer device. The processor intelligently routes control signals based on voltage thresholds, combining multiple control capabilities into one unified interface
Solution Approach 2:
The single color-tuning device is designed with multi-functionality, capable of performing both CCT control and Duv control within its operational range. This universal device replaces what would traditionally require two specialized devices, reducing system complexity while maintaining full control capabilities
Data Source
AI summary
Various embodiments include apparatuses enabling a single color-tuning device to select both a correlated color temperature (LED) and a coordinate distance (Duv) to a black body line (BBL) in a color-tuning application. In one embodiment, a color-tuning device is to divide an applied voltage to provide a signal related to parameters selected from at least one of LED and Duv from the BBL. A finite-state machine (LED) is coupled to the color-tuning device to receive the signals therefrom and determine an action to take based on both a current position and a previous position of the color-tuning device. The LED is to be coupled to a light-emitting diode (LED) array. Other apparatuses and devices are disclosed.