Lighting Controller with Adaptive Detection Radius for Granular Dimming
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Solution Overview
Problem
Existing lighting systems with granular dimming suffer from inaccurate presence detection in remote regions, leading to non-continuous and occasional lamp activation in adjacent areas, causing annoyance and energy inefficiency.
Innovation Solution
A lighting controller that adapts the detection radius of presence sensors based on the current lighting status and presence detection status, increasing the radius when lighting is on and decreasing it when lighting is off or presence is not detected, to enhance robustness and accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple presence sensors with overlapping Fields-of-View are employed for granular dimming, then presence detection accuracy is improved, but false triggers in adjacent regions increase
Solution Approach 1:
The patent applies dynamics by making the detection radius of presence sensors adjustable rather than fixed. The controller dynamically adapts the detection radius of adjacent presence sensors based on whether their associated lighting devices are currently on or off. When a lighting device is off, the adjacent sensor's detection radius is reduced to prevent false triggers from detecting presence in remote regions that should not activate that particular lamp.
Solution Approach 2:
The patent changes the parameter of detection radius dynamically. The controller modifies the detection radius parameter of presence sensors based on the operational state of associated lighting devices. This parameter adaptation allows the system to maintain accurate presence detection while preventing false triggers by reducing the detection radius in regions where lighting is not currently active.
2Reliability
If the detection radius is increased to ensure continuous presence detection, then detection reliability is improved, but energy consumption increases due to unnecessary lamp activation
Solution Approach 1:
The system dynamically adjusts the detection radius based on the operational state of lighting devices. When lighting is off, the detection radius is reduced to prevent false triggers that would cause unnecessary energy consumption. When lighting is on, the full detection radius is maintained to ensure reliable presence detection. This dynamic adaptation resolves the contradiction between detection reliability and energy efficiency.
Solution Approach 2:
The detection radius parameter is changed dynamically based on lighting status. By reducing the detection radius parameter when lighting is off, the system prevents false triggers and unnecessary energy consumption. This parameter adaptation maintains detection reliability when needed while minimizing energy waste when lighting is not active.
3Object-generated harmful factors
If the detection radius is reduced to prevent false triggers, then false negatives increase, but energy consumption decreases
Solution Approach 1:
The system dynamically adjusts the detection radius based on lighting status rather than using a fixed reduced radius. When lighting is on, the full detection radius is maintained to prevent false negatives. When lighting is off, the detection radius is reduced to prevent false triggers. This dynamic approach resolves the contradiction by adapting the detection radius to current operational needs.
Solution Approach 2:
The detection radius parameter is changed dynamically based on whether lighting is currently active. This parameter adaptation ensures that presence detection accuracy is maintained when lighting is on (preventing false negatives) while reducing false triggers when lighting is off. The parameter change is contextual rather than fixed.
Data Source
AI summary
The invention provides a lighting controller arranged for controlling a lighting device in response to a presence detected within a detection radius of a presence sensor; characterized in that the lighting controller is configured to: determine a current lighting status of the lighting device indicative of whether the lighting device provides a lighting characteristic; determine a current presence detection status indicative of whether the presence is detected within an initial detection radius of the presence sensor; adapt the initial detection radius of the presence sensor to an adapted detection radius in which a presence is to be detected based on the current lighting status of the lighting device and the current presence detection status. The invention further provides a system comprising said lighting controller, a presence sensor and a lighting device.