Segmented LED Fixture for Independent CCT and Brightness Adjustment

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Solution Overview

Problem

LED lighting systems fail to adjust color temperature in response to changes in brightness, necessitating the use of multiple LED chips to mimic incandescent lighting, which is not efficient and can disrupt health due to bright light exposure.

Innovation Solution

A dimmable LED light fixture with adjustable correlated color temperature (CCT) control circuitry that allows simultaneous adjustment of brightness and CCT using a dimmer switch and CCT controller, enabling smooth transitions between different CCT settings.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Use of energy by moving object

If LED brightness is reduced by controlling driver current, then energy efficiency is improved, but color temperature cannot be adjusted like incandescent lamps

Engineering Contradiction:

Improveenergy efficiencyVSAvoidcolor temperature adjustment capability

Core Design Contradiction:

Use of energy by moving objectVSAdaptability or versatility

Solution Approach 1:

The LED bank is divided into multiple subsets, each containing LEDs with different color temperatures (e.g., 3000K and 2000K). By independently controlling the current to each subset, the system can adjust both brightness and color temperature separately, resolving the contradiction between energy efficiency and color temperature adaptability.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The system changes the electrical parameters (current ratios) supplied to different LED subsets to achieve varying color temperatures and brightness levels. By adjusting the current ratio mix to different LED chips, the fixture can achieve incandescent-like color temperature variation while maintaining LED energy efficiency.

Inventive Principle:

Principle #35Parameter changes

2Adaptability or versatility

If multiple LED chips with different color temperatures are used to achieve CCT adjustment, then color temperature versatility is improved, but device complexity increases

Engineering Contradiction:

ImproveCCT adjustment capabilityVSAvoidcontrol circuitry complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The control circuitry merges the dimmer switch and CCT controller into a unified control system that processes a single composite control signal. This integration reduces the need for separate complex control circuits for each LED subset, simplifying the overall device while maintaining the ability to adjust both brightness and color temperature.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The control circuitry is designed to perform multiple functions: it controls both the brightness level and the color temperature by adjusting current ratios to different LED subsets. This multi-functionality reduces the need for separate dedicated circuits, thereby reducing overall device complexity while maintaining full CCT adjustment capability.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Illumination intensity

If bright light is used to maintain luminosity during CCT adjustment, then brightness is improved, but health disruption increases

Engineering Contradiction:

ImprovebrightnessVSAvoidhealth disruption from bright light exposure

Core Design Contradiction:

Illumination intensityVSObject-affected harmful factors

Solution Approach 1:

The system applies different color temperatures to different LED subsets based on the desired lighting scenario. By selecting appropriate color temperature combinations (e.g., warmer tones for evening), the system maintains brightness while reducing the harmful effects of excessive blue light exposure, thus addressing health concerns while preserving luminosity.

Inventive Principle:

Principle #3Local quality

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

The solution provides a comfortable lighting environment by adjusting CCT from bright white to amber tones while maintaining brightness, reducing health disruptions and enhancing user experience.

Implementation Method 1

a first LED light source having a first CCT, a second LED light source having a second CCT different from the first CCT, and a third LED light source having a third CCT different from the first CCT and the second CCT

Methodology Applied

Scientific EffectLight Emitting Diode: Light Emitting Diode

Implementation Method 2

the first light emitted from the first LED light source, second light emitted from the second LED light source, and third light emitted from the third LED lights source, may be combined during operation to produce a composite light having a brightness and a composite CCT

Methodology Applied

Scientific EffectLuminescence: Luminescence

Data Source

PatentUS20250311070A1Dimmable LED light fixture with adjustable correlated color temperature change (CCT) and brightness parameters

Publication Date: 2025.10.02 GLOBE ELECTRIC COMPANY INC

AI summary

Components and circuitry for controlling a bank of LEDs based on a dimmer switch and a CCT controller to maintain a brightness level while changing the color temperature of an emitted composite light, to adjust a brightness level simultaneous to changing the color temperature of the emitted composite light, and to drive the bank of LEDs to generate the composite light based on selection of one or more CCT setpoints of the CCT controller.