LED Dimming via Difference Amplifiers for CCT Control
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Solution Overview
Problem
Existing lighting solutions require separate controls for adjusting Correlated Color Temperature (CCT) and intensity level, which can be expensive and inconvenient to install, especially in retrofit installations, and do not effectively mimic natural lighting.
Innovation Solution
A lighting device with multiple groups of LEDs that use difference amplifiers to control current flow based on a single dimmer input, allowing for simultaneous adjustment of CCT and intensity, utilizing a combination of LEDs to achieve desired color temperatures and brightness levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate controls are used for adjusting CCT and intensity level, then precise control of lighting parameters is achieved, but installation cost and complexity increase
Solution Approach 1:
The patent combines separate CCT control and intensity control into a single integrated control system. The controller receives a single control signal and simultaneously adjusts both the correlated color temperature and intensity level by regulating current distribution to different LED groups, eliminating the need for separate controls.
Solution Approach 2:
The single controller performs multiple functions by processing one control signal to simultaneously manage both CCT adjustment and intensity control. The system universally handles dual control objectives through a unified control architecture, reducing installation complexity while maintaining precise control capabilities.
2Measurement precision
If multiple separate controls are installed for CCT and intensity, then precise lighting adjustment is achieved, but installation convenience deteriorates
Solution Approach 1:
The patent merges multiple control functions into a single control interface. The unified controller accepts one control signal and simultaneously manages both CCT and intensity adjustments, making installation more convenient while preserving precise lighting control capabilities.
3Adaptability or versatility
If additional CCT control is installed in retrofit applications, then lighting parameter control is improved, but installation difficulty increases due to structural constraints
Solution Approach 1:
The patent combines CCT control and intensity control into a single integrated controller that can be installed in retrofit applications without requiring separate control components. This unified approach reduces installation complexity and overcomes structural constraints while maintaining full lighting control versatility.
Solution Approach 2:
The single controller performs multiple control functions simultaneously, providing both CCT adjustment and intensity control in one device. This multi-functional capability makes the system highly adaptable for retrofit installations where space and structural modifications are limited.
4Adaptability or versatility
If separate controls are used for CCT and intensity, then independent control of each parameter is achieved, but overall system cost increases
Solution Approach 1:
The patent combines separate CCT control and intensity control systems into a single integrated controller. This merging reduces the total quantity of control components required, lowering system cost while maintaining the ability to independently adjust both lighting parameters through unified control logic.
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
Enables cost-effective and convenient control of both CCT and intensity using a single control mechanism, providing illumination that closely matches natural lighting conditions by adjusting current flow through different groups of LEDs.
Implementation Method 1
a first group of light emitting diodes (LEDs) to emit a first light, a second group of LEDs to emit a second light, and a third group of LEDs to emit a third light
Data Source
AI summary
A lighting device includes a light source that emits an illumination light. The light source includes a first group of light emitting diodes (LEDs) to emit a first light, a second group of LEDs to emit a second light, and a third group of LEDs to emit a third light. The second light is warmer light than the first light, and the third light is cooler light than the first light. The lighting device further includes a first difference amplifier that controls a first current flow through the second group of LEDs at least based on a magnitude of a current flowing through the light source. The lighting device also includes a second difference amplifier that controls a second current flow through the third group of LEDs at least based on the magnitude of the current flowing through the light source.