Dual LED Plurality Warm Dim Circuitry
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Solution Overview
Problem
LED luminaires do not mimic the color-changing effect when dimmed, as incandescent lights do, since their brightness reduction does not correlate with a warmer color temperature, disrupting the natural chromaticity change experienced with incandescent dimming.
Innovation Solution
Implementing a remote phosphor and two pluralities of LEDs, where one set emits electromagnetic radiation at specific frequencies to provide phosphor illumination and the other set, emitting different frequencies, provides double-phosphor illumination, allowing for dimming of the first set while maintaining constant illumination from the second set, thereby simulating the color-warming effect of incandescent dimming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If LED power is reduced to dim the light, then brightness decreases, but color temperature remains unchanged
Solution Approach 1:
The LED array is divided into two separate pluralities: first plurality of LEDs for phosphor illumination and second plurality of phosphor LEDs for double-phosphor illumination. This segmentation allows independent control of each LED group, enabling the first plurality to be dimmed while the second plurality maintains constant current to preserve color temperature during dimming operations.
Solution Approach 2:
The system changes the electrical parameter (current) applied to different LED groups differently: the first plurality receives variable current for dimming control, while the second plurality receives constant current. This parameter differentiation enables brightness adjustment without color temperature shift, resolving the contradiction between brightness control and color stability.
2Illumination intensity
If incandescent filament temperature is lowered to reduce brightness, then brightness decreases, but color becomes warmer (redder)
Solution Approach 1:
The patent copies the visual effect of incandescent dimming (color warming) using LED technology with remote phosphor and dual LED pluralities. By combining phosphor conversion from the first LED plurality with direct phosphor emission from the second plurality, the system reproduces the characteristic color temperature shift of incandescent bulbs during dimming, achieving the same aesthetic effect through a different physical mechanism.
3Adaptability or versatility
If remote phosphor is used with dual LED pluralities, then warm dim effect is achieved, but device complexity increases
Solution Approach 1:
The patent merges two different illumination mechanisms (phosphor conversion from first LEDs and direct phosphor emission from second phosphor LEDs) into a single integrated luminaire structure with shared remote phosphor. This combination achieves sophisticated color temperature control and warm dimming effects while consolidating components rather than using separate systems, thereby managing complexity through integration.
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 enables LED luminaires to maintain a consistent color temperature range during dimming, closely mimicking the natural color change of incandescent lights, ensuring a warm dim effect across a significant illumination range while maintaining luminous efficiency.
Implementation Method 1
providing electrical power to a first plurality of LEDs emitting electromagnetic radiation at a first set of one or more frequencies to a remote phosphor to provide phosphor illumination via the remote phosphor
Implementation Method 2
providing electrical power to a second plurality of LEDs, the second plurality of LEDs being phosphor LEDs emitting phosphor electromagnetic radiation at a second set of one or more frequencies that are different than the first set one or more frequencies to the remote phosphor to provide double-phosphor illumination via the remote phosphor
Implementation Method 3
emitting electromagnetic radiation at a first set of one or more frequencies to a remote phosphor to provide phosphor illumination via the remote phosphor
Data Source
AI summary
A method of dimming an LED luminaire and a dimmable LED luminaire includes two pluralities of LEDs. The first plurality emits electromagnetic radiation at a first frequency to react with a remote phosphor and provide a phosphor illumination. The second plurality of LEDs are phosphor LEDs that emit phosphor electromagnetic radiation at a second frequency to react with the remote phosphor and provide double-phosphor illumination. The phosphors and LEDs are configured to produce specific color points when the LEDs are at full power and at full dim. When the luminaire receives a dimming signal, the first plurality of LEDs dim the phosphor illumination over a majority of the luminaire's illumination range, but the second plurality of LEDs continue to receive constant current and provide undimmed double-phosphor illumination over the majority of the luminaire's illumination range.