Multi-Channel LED Driver Control for Natural Dimming Color Shift
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Solution Overview
Problem
Discrete-spectrum light sources like LEDs and CFLs do not follow Plank's law when dimmed, resulting in unnatural color temperature changes that can appear distracting or unnatural to the human eye, especially when placed near traditional black body radiator light sources.
Innovation Solution
A lighting control system that uses multiple LED drivers and a controller to adjust the intensity of LED light sources based on a single digital message, allowing for precise control of color temperature by varying the intensity of discrete-spectrum light sources to mimic the behavior of traditional light sources, ensuring a natural color shift during dimming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If discrete-spectrum light sources (LEDs, CFLs) are used to replace traditional light sources, then energy efficiency is improved, but color temperature behavior becomes unnatural when dimmed
Solution Approach 1:
The patent segments the lighting control into multiple independent LED drivers, each controlling a specific LED channel with its own characteristics. This allows independent adjustment of each channel's intensity to collectively simulate the continuous spectrum behavior of traditional light sources when dimmed, resolving the unnatural color temperature shift while maintaining LED energy efficiency.
Solution Approach 2:
The patent dynamically changes the intensity parameters of individual LED channels based on the desired dimming level. By adjusting the intensity of each LED driver independently according to pre-stored intensity sets, the system simulates the continuous spectrum shift of traditional black body radiators, maintaining natural color temperature behavior while using energy-efficient LEDs.
2Measurement precision
If multiple LED drivers are used to control different LED channels, then color temperature control precision is improved, but device complexity increases
Solution Approach 1:
The patent divides the lighting fixture into multiple channels, each controlled by a separate LED driver. Each driver is configured with specific intensity sets for its LED channel, allowing precise control of color temperature through coordinated operation of multiple simple drivers rather than one complex driver.
Solution Approach 2:
Each LED driver is pre-configured with its own intensity sets specific to its LED channel characteristics. The drivers autonomously adjust their output based on received control signals without requiring complex centralized processing, distributing the control intelligence and reducing overall system complexity while maintaining precision.
3Ease of operation
If intensity of LED light sources is adjusted to simulate traditional light behavior, then visual naturalness is improved, but control system complexity increases
Solution Approach 1:
The patent pre-calculates and stores intensity sets for each LED channel that correspond to different dimming levels. When dimming is required, the system simply retrieves and applies the appropriate pre-computed intensity set, simulating traditional light behavior without requiring complex real-time calculations, thus maintaining visual naturalness while keeping the control system relatively simple.
4Ease of operation
If a single digital message controls multiple LED drivers, then ease of operation is improved, but coordination complexity increases
Solution Approach 1:
The patent implements a universal control message format that can address and control multiple different LED drivers simultaneously. Each driver interprets the message according to its specific configuration and channel characteristics, allowing a single control interface to manage the entire multi-channel system while each driver maintains its independent operation, balancing ease of operation with coordination simplicity.
Data Source
AI summary
A lighting control system for controlling a cumulative light emitted by a lighting fixture having a plurality of LED light sources may comprise a plurality of LED drivers adapted to be coupled to a respective one of the LED light sources and configured to control an intensity of the respective LED light source, and a controller configured to transmit a single digital message for controlling the cumulative light emitted by the lighting fixture. Each of the plurality of LED drivers is configured to adjust the intensity of the respective LED light source to a preset intensity in response to the single digital message transmitted by the controller.