Tunable White Lighting Control Using Fixture Power Signatures
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing lighting systems face challenges in accurately controlling both brightness and color temperature of tunable white light fixtures, particularly in circadian lighting systems, and lack efficient methods to detect and report failures or malfunctions of LED fixtures, leading to inadequate lighting conditions and reduced reliability.
Innovation Solution
A system and method for measuring and controlling tunable white light fixtures by defining a power signature based on voltage and current, comparing it to a reference, and reporting deviations to a building management system, enabling proactive maintenance and reliable operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If manual inspection methods are used to detect failed LED fixtures, then the system complexity is reduced, but the detection time and productivity are significantly worsened
Solution Approach 1:
The LED fixtures self-monitor their own operational status through integrated sensors that continuously track power consumption, temperature, and performance parameters. The fixtures automatically detect when they are malfunctioning or failing, eliminating the need for manual inspection while maintaining simple system architecture.
Solution Approach 2:
The system implements continuous feedback loops where fixtures transmit their operational data to a central controller or cloud platform. This enables real-time monitoring and automatic detection of failures without requiring manual intervention, significantly improving detection speed while keeping the overall system relatively simple.
2Device complexity
If traditional monitoring methods measuring power consumption or light output are used, then the device complexity is reduced, but the measurement precision and reliability are worsened due to inaccuracies from power supply fluctuations and ambient lighting
Solution Approach 1:
The monitoring function is segmented into multiple independent sensors within each fixture, each measuring specific parameters (power consumption, temperature, current, voltage). This segmentation allows the system to compensate for fluctuations in individual measurements by cross-referencing multiple data sources, improving precision without significantly increasing overall complexity.
Solution Approach 2:
The system monitors multiple parameters simultaneously (power consumption, temperature, current, voltage) and analyzes their relationships to detect fixture health status. By changing from single-parameter monitoring to multi-parameter analysis, the system achieves higher measurement precision while maintaining manageable complexity through integrated sensor design.
3Device complexity
If no failure detection system is implemented, then the device complexity is minimized, but the reliability and productivity are worsened due to unexpected lighting failures
Solution Approach 1:
The system performs preliminary monitoring of fixture performance parameters to detect early signs of failure before complete malfunction occurs. By identifying potential issues in advance and alerting maintenance personnel, the system improves reliability through proactive maintenance while keeping the detection system relatively simple and integrated into the fixture design.
Data Source
AI summary
A method of operating a lighting device system. The method comprising the steps of defining a first power signature for a first light fixture based on a first resulting voltage and a first target current of the first light fixture, measuring a second power signature of a second light fixture, comparing the second power signature of the second light fixture to the first power signature of the first light fixture; and determining whether the first light fixture experienced an undesired operating state if the second power signature of the first light fixture deviates from the first power signature of the first light fixture. In one arrangement, the first light fixture is substantially equivalent to the second light fixture.