DALI Command Converter for LED Color Temperature Control
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Solution Overview
Problem
Existing DALI lighting systems lack the ability to explicitly adjust color temperature using standard commands, relying on additional network traffic for color temperature control, which is not supported by all DALI controllers and fixtures.
Innovation Solution
A DALI command converter device that utilizes dimming curve data to generate output signals for LED light sources, allowing color temperature adjustment based on standard DALI dim level commands, thereby enabling color temperature control without dedicated color temperature control commands.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate DALI commands are used for color temperature control, then color temperature adjustment capability is improved, but network traffic increases and device compatibility decreases
Solution Approach 1:
The patent makes the existing DALI dim level command multi-functional by enabling it to control both light intensity and color temperature through the use of dimming curves. The controller interprets dim level commands to adjust the output of different LED chips (warm white and cool white) according to stored dimming curve data, allowing a single command type to achieve dual control functions without increasing network traffic or requiring additional dedicated color temperature control commands.
2Adaptability or versatility
If multiple LED light sources with different CCT are combined, then color temperature adjustment capability is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple LED light sources (first LED light source emitting first light and second LED light source emitting second light with different correlated color temperatures) within a single lighting fixture to produce combined light with adjustable color temperature. The DALI command converter device integrates the control logic and dimming curve data storage, merging the functions of multiple LEDs and control mechanisms into a unified system that can be managed through standard DALI commands.
3Adaptability or versatility
If DALI dim level commands are used for color temperature control, then device compatibility is improved, but control precision for color temperature may be affected
Solution Approach 1:
The patent implements preliminary action by pre-storing multiple sets of dimming curve data in the controller, where each set corresponds to different correlated color temperatures. When a DALI dim level command is received, the controller selects the appropriate dimming curve based on the desired color temperature and uses it to calculate the required output levels for each LED light source. This pre-prepared data structure enables precise color temperature control through standard dim level commands, maintaining both device compatibility and control precision.
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 color temperature adjustment of combined light emitted by multiple LED sources within a DALI lighting system using standard DALI dim level commands, reducing network traffic and supporting color temperature control in systems that do not natively support it.
Implementation Method 1
a first light emitting diode (LED) light source to emit a first light, and a second LED light source to emit a second light
Implementation Method 2
The first light and the second light combine to produce a combined light provided by the lighting fixture
Data Source
AI summary
A method of adjusting a correlated color temperature (CCT) of a light provided by a lighting fixture includes receiving, by a DALI command converter device, a DALI dim level command indicating a dim level for the light provided by the lighting fixture. The method further includes providing a first output signal to adjust a dim level of a first light emitted by a first light emitting diode (LED) light source to a first dim level. The method also includes providing a second output signal to adjust a dim level of a second light emitted by a second LED light source to a second dim level that is different from the first dim level. The light provided by the lighting fixture is a combination of the first light and the second light. The DALI command converter device generates the first output signal and the second output signal based on the DALI dim level command.