Color Temperature Smoothing via Ambient Feedback Control
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Solution Overview
Problem
Conventional color temperature adjustable LED lamps cause retina damage due to rapid color temperature changes, as they significantly and abruptly alter ambient luminance by dynamically adjusting power ratios between low and high color temperatures.
Innovation Solution
A color temperature smoothing output system that includes multiple LED light sources and a controller with noise modulators, which gradually adjusts the power of low and high color temperature sources based on ambient luminance feedback to prevent sudden changes, using a light sensor to detect and modulate the color temperature to target values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the conventional color temperature adjustable LED lamp dynamically adjusts power ratios between low and high color temperature sources, then color temperature adjustment capability is improved, but ambient luminance varies significantly and rapidly causing retina damage
Solution Approach 1:
The patent introduces an ambient light sensor as an intermediary to detect actual ambient luminance levels and feed this information back to the controller. This mediator enables the system to adjust color temperature changes based on real environmental conditions rather than making abrupt transitions, thereby preventing retina damage while maintaining color temperature adjustability
Solution Approach 2:
The system implements a feedback mechanism where the ambient light sensor continuously monitors ambient luminance and provides this data to the controller. The controller uses this feedback information to dynamically adjust the power ratios of LED sources, ensuring that color temperature transitions occur gradually and safely according to actual environmental lighting conditions
2Speed
If the LED lamp rapidly changes color temperature to respond to user demands, then response speed is improved, but the sudden light variation damages human vision
Solution Approach 1:
The patent applies dynamics by making the color temperature adjustment process adaptive rather than static. The system dynamically modifies the adjustment speed and magnitude based on ambient luminance conditions detected by the sensor, allowing fast response when appropriate and gradual transitions when necessary to protect vision
Solution Approach 2:
The system changes the parameter of color temperature transition speed based on ambient lighting conditions. When ambient light levels indicate potential risk to vision, the system automatically reduces the rate of color temperature change, effectively adjusting the speed parameter to prevent harm while maintaining operational responsiveness
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 system effectively prevents retina damage by smoothly adjusting color temperature and luminance, ensuring a gradual adaptation to ambient changes, thereby protecting human vision from sudden light variations.
Implementation Method 1
a light sensor is electrically coupled to the first mixed light source and the controller for detecting color temperature of ambient luminance
Data Source
Figure 1~2
Figure 3~4
AI summary
In a color temperature smoothing output system, a first mixed light source emits a first color temperature. A second mixed light source emits a second color temperature that is higher than the first color temperature. A light sensor detects an ambient luminance that is formed by both the first color temperature and the second color temperature and generate a primary sense signal based on the detected ambient luminance. A controller transforms the primary sense signal into a first sense signal that corresponds to the first color temperature's proportional power and a second sense signal that corresponds to the second color temperature's proportional power. The controller reduces the first/second sense signal's difference from the first/second color temperature's proportional power by recursive modulations and then applies the modulated first/second sense signal to drive the first/second mixed light source.