Dimming Control System for LED Lighting Arrangement
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Solution Overview
Problem
Existing LED lighting exhibits significant color shift during dimming, making it difficult to provide a suitable dimmable LED alternative as the color temperature can change by as much as 300K CCT, which is noticeable to users.
Innovation Solution
The implementation of a lighting system that employs at least two sets of light sources with different Correlated Color Temperatures (CCTs, where a second set of light sources takes over after a predetermined dimming threshold is reached, coordinated by a dimming control system to maintain a constant color temperature during dimming operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single set of LED light sources is used for dimming, then the device complexity is low, but the color temperature stability deteriorates (color shift up to 300K CCT)
Solution Approach 1:
The lighting system is segmented into multiple sets of LED light sources with different CCT characteristics. Each set operates in specific dimming ranges, allowing the system to maintain color stability by switching between segments rather than relying on a single set that would cause color shift across the entire dimming range.
Solution Approach 2:
The system changes operational parameters by switching between different LED sets with distinct CCT values. When dimming occurs, the control system transitions from one LED set to another, each optimized for specific brightness levels, thereby maintaining consistent color temperature throughout the dimming process.
2Stability of the object's composition
If multiple sets of light sources with different CCTs are employed during dimming, then the color temperature stability is improved (color shifting reduced by at least half), but the device complexity increases
Solution Approach 1:
The lighting system dynamically switches between different LED sets based on the dimming level. The control system monitors brightness requirements and automatically transitions between LED sets with different CCTs, creating a dynamic adaptation mechanism that maintains color stability without requiring manual intervention.
Solution Approach 2:
A control system acts as an intermediary between the user's dimming request and the physical LED sets. This intermediary manages the complexity by automatically determining when to switch between LED sets, thereby maintaining color stability while shielding the user from the underlying system complexity.
3Illumination intensity
If LED current is reduced for dimming, then the brightness is adjusted, but the color temperature shifts noticeably (up to 300K CCT change)
Solution Approach 1:
The system performs preliminary actions by pre-selecting appropriate LED sets based on the target brightness level. Before dimming occurs, the control system determines which LED set should be active to maintain color stability, preventing color shift rather than correcting it afterward.
Solution Approach 2:
The system uses multiple copies of LED sets with different CCT characteristics. Instead of relying on a single LED set that would change color when dimmed, the system has redundant LED sets available, each optimized for specific brightness ranges, allowing seamless transition without color shift.
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
This approach reduces color shifting by at least half compared to prior art, increasing the desirability of LED alternatives in dimmable lighting by ensuring a more consistent color temperature throughout the dimming process.
Implementation Method 1
Light Emitting Diodes (LEDs) have many advantages over conventional light sources
Implementation Method 2
when the amount of current provided to an LED or group of LEDs is reduced from one current value to another current value, the brightness of the LED will change
Data Source
AI summary
An illumination device, system, and method are disclosed. The illumination system includes a first set of light sources and a second set of light sources, driven by a first driver and second driver, respectively. The system further includes a dimming control system that implemented dimming control logic. The dimming control logic coordinates the operation of the first and second drivers such that the first and second sets of light sources are activated and deactivated so as to achieve substantially constant color temperature during dimming operations.