DALI Lighting Control Using Relative Luminance Ratios
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Solution Overview
Problem
Current DALI-based lighting control systems lack a scheme for detecting light sensor events and setting operating setpoints, leading to inconsistent luminance measurements due to sensor location, type, and reflection coefficients, and require manual adjustments when the lit space or sensor location changes.
Innovation Solution
A method and apparatus that receive event messages from light sensors, determine luminance changes relative to setpoints, and send control commands to adjust lighting accordingly, using a DALI-based system to set and confirm light sensor parameters, ensuring consistent lighting control regardless of sensor installation conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If absolute luminance (Lux) measurement is used by the light sensor, then lighting control can be implemented, but measurement consistency deteriorates due to variations in sensor location, type, and reflection coefficient
Solution Approach 1:
The system changes the parameter basis from absolute luminance (Lux) to relative luminance change ratios. Instead of using fixed Lux thresholds that vary with sensor characteristics, the system measures the ratio of luminance changes between different sensors, which eliminates the need for absolute calibration and compensates for variations in sensor location, type, and environmental reflection coefficients.
2Measurement precision
If manual adjustment of operating setpoint is required when sensor location or lit space changes, then measurement accuracy can be maintained, but system complexity and operation time increase
Solution Approach 1:
The system enables self-service by automatically adapting to changes in sensor location or lit space through continuous relative measurement. The light sensors continuously monitor luminance changes and automatically adjust control decisions based on the measured ratios, eliminating the need for manual intervention or complex reconfiguration schemes when environmental conditions change.
3Extent of automation
If event detection scheme is insufficient in DALI system, then lighting control can be implemented, but reliability of automatic control deteriorates
Solution Approach 1:
The system implements feedback by continuously monitoring luminance changes through event messages from light sensors and using these measurements to automatically adjust lighting control decisions. The relative luminance change ratio provides continuous feedback that enables reliable automatic control without requiring complex event detection schemes, as the system responds to actual measured changes rather than relying on predetermined event thresholds.
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 adaptive lighting control based on relative brightness, reducing the need for manual adjustments and ensuring consistent lighting performance across different environments and sensor configurations.
Implementation Method 1
a light sensor, that is, one of the input devices. The light sensor generates an event message when the luminance of a lit space and a set parameter change
Data Source
AI summary
An apparatus and method for controlling lighting are disclosed. The apparatus includes a reception unit, a determination unit, a state determination unit, and a lighting control command transmission unit. The reception unit receives an event message from a light sensor. The determination unit determines whether the event message is an event message attributable to a change in luminance or an event message related to a DALI system. If it is determined that the event message is the event message attributable to a change in the luminance, the state determination unit determines the luminance change state of a lit space using the event message attributable to a change in the luminance. The lighting control command transmission unit sends a lighting control command corresponding to the luminance change state using a control group address.