LED Driver Control Module for Low-End Dimming and Color Temperature
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Solution Overview
Problem
Discrete-spectrum light sources, such as LEDs and CFLs, do not change color temperature when dimmed, leading to an unnatural lighting experience and lack of load regulation capability in existing LED drivers.
Innovation Solution
A control module that regulates the current to LED light sources, allowing for adjustment of color temperature and intensity to mimic black body radiator behavior, even at low intensities, using a combination of an LED driver and a control module that diverts current to achieve desired color temperature and intensity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If discrete-spectrum light sources (LEDs, CFLs) are used, then energy efficiency is improved, but color temperature cannot be adjusted naturally when dimming
Solution Approach 1:
The lighting system is divided into multiple LED channels with different color temperatures (e.g., warm white, neutral white, cool white). By independently controlling the intensity of each channel, the system can segment the overall light output to achieve various color temperature combinations while maintaining energy efficiency of LED technology.
Solution Approach 2:
The control module dynamically adjusts the mixing ratio of different LED channels based on the desired color temperature and intensity level. As the overall intensity changes, the system dynamically rebalances the contribution of each channel to maintain natural color temperature transitions, creating an adaptive lighting experience.
2Illumination intensity
If LED drivers are used, then light output is improved, but load regulation capability is insufficient for natural dimming
Solution Approach 1:
The control module incorporates feedback mechanisms to monitor the actual light output and color temperature of the LED channels. Based on this feedback, the system automatically adjusts the drive current to each channel to maintain accurate color temperature transitions during dimming, enabling precise load regulation beyond standard LED driver capabilities.
Solution Approach 2:
The system changes multiple parameters simultaneously - adjusting both the intensity level and the color temperature by varying the drive current distribution across different LED channels. This multi-parameter control enables natural dimming behavior that mimics traditional lighting while maintaining high LED efficiency.
3Adaptability or versatility
If color temperature is changed, then lighting ambiance is improved, but intensity regulation is limited
Solution Approach 1:
By segmenting the lighting output into multiple independent color channels, the system can regulate intensity at any color temperature level. Each channel contributes to both the total intensity and the color temperature, allowing independent adjustment of these parameters across the full intensity range without the limitations of single-channel LEDs.
Data Source
AI summary
A lighting control system for controlling a cumulative light emitted by a lighting fixture may comprise a light-emitting diode (LED) driver comprising an output for conducting an output current, and a control module electrically coupled to the output of the LED driver for receiving the output current. The LED driver may regulate the magnitude of the output current towards a target current, and may be characterized by a low-end intensity. The control module may be coupled to a first LED light source of the LED light sources. The control module may receive a command including a requested intensity and control the magnitude of a first LED current through the first LED light source. The control module may control the cumulative light output of the lighting fixture below the low-end intensity of the LED driver by diverting a portion of the output current away from the first LED light source.