UV Visible LED Array Occupancy Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional LED lighting systems that incorporate UV LEDs for antimicrobial purposes often expose humans to UV light, which can be harmful, and can degrade materials, while continuous UV illumination affects color temperature and is unnecessary when areas are occupied.
Innovation Solution
A lighting system with separate UV and visible light sources, controlled by sensors and a circuit that activates UV light only when the area is unoccupied and microbial presence exceeds a threshold, and deactivates it when occupied, thereby minimizing human exposure and extending the lifespan of the LEDs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UV light is used continuously for antimicrobial functions, then microbial presence is reduced, but human exposure to harmful UV light increases and materials degrade
Solution Approach 1:
The system implements periodic UV illumination by alternating between UV-on and UV-off states based on occupancy detection. When the space is unoccupied, UV light is activated for antimicrobial treatment; when occupancy is detected, UV light is deactivated to prevent human exposure. This periodic operation maintains microbial control effectiveness while eliminating harmful continuous exposure.
Solution Approach 2:
The system uses occupancy sensors to provide real-time feedback about human presence in the space. This feedback signal controls the UV light source through a control circuit that automatically switches the UV illumination state based on detected occupancy levels, ensuring UV light is only active when safe and effective.
2Reliability
If UV light is illuminated continuously, then microbial elimination is maintained, but color temperature control becomes difficult and LED lifespan decreases
Solution Approach 1:
The UV LED operates in periodic cycles rather than continuously, switching between active and inactive states based on occupancy and microbial presence. This intermittent operation reduces cumulative thermal stress on the LED, maintaining color temperature stability and extending operational lifespan while preserving antimicrobial effectiveness during active periods.
Solution Approach 2:
The system performs preliminary occupancy detection and microbial assessment before activating UV illumination. By checking conditions in advance and only activating UV when necessary (unoccupied space with detected microbes), the system avoids unnecessary LED operation that would contribute to thermal degradation and color temperature drift.
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
This solution effectively reduces microbial presence without human exposure to UV light, extends the life and maintains the color temperature of the LEDs by limiting unnecessary UV illumination, and reduces the need for antimicrobial coatings.
Implementation Method 1
Ultraviolet (UV) light illumination has been shown to exhibit antimicrobial functions because it can eliminate microbes as well as prohibit germ and mold growth
Implementation Method 2
LED lighting systems can include one or more LED devices that become illuminated as a result of the movement of electrons through a semiconductor material
Data Source
AI summary
Systems and methods for controlling a light emitting diode (LED) system associated with an area and having a plurality of LED arrays are provided. In some implementations, the lighting system can include a first LED array associated with visible light and a second LED array associated with UV light. The lighting system can include one or more first sensors configured to detect occupancy within the area and send signals indicating whether the area is occupied. The lighting system can include one or more second sensors configured to detect microbes within an area and send signals indicating whether microbes are present in the area. The lighting system can include a control circuit configured to receive the signals sent by the one or more first and second sensors and to control the first LED array and the second LED array based on the signals.