Auxiliary Movement Detector for Lighting Control System
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Solution Overview
Problem
Existing lighting control systems face challenges in expanding detection zones without signal collisions and in areas without mains power, where battery-powered auxiliary movement detectors are needed with minimal energy consumption to ensure long battery life and reliable operation.
Innovation Solution
A separate, auxiliary movement detector operates in a low-energy monitoring mode until movement is detected, then switches to a command mode with brief output signals sent over a communication bus, minimizing power consumption and extending battery life to five years, while only the master controller processes these signals to control slave luminaires.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a battery-powered auxiliary movement detector is used to expand detection zones in areas without mains power, then the detection coverage is improved, but the energy consumption increases, reducing battery life
Solution Approach 1:
The auxiliary movement detector operates in periodic polling mode, where the master controller sends periodic presence requests and the auxiliary detector responds only when movement is detected. This transforms continuous monitoring into periodic intermittent operation, dramatically reducing average power consumption while maintaining detection capability across the expanded zone.
Solution Approach 2:
The system dynamically switches the auxiliary detector between low-power sleep mode and active detection mode based on whether movement is present. The detector remains in sleep mode during periods of no activity and activates only when presence is detected, adapting its power consumption to actual operational needs rather than maintaining constant operation.
2Area of stationary object
If multiple master luminaires are installed to expand detection zones, then the detection coverage is improved, but signal collisions occur on the communication bus
Solution Approach 1:
Instead of allowing multiple master luminaires to independently generate and broadcast presence commands (which causes collisions), the system inverts the architecture: a single master controller coordinates all presence detectors, and only the master generates commands on the bus. The auxiliary detectors become slaves that report presence information without initiating communication, eliminating signal collisions while maintaining expanded detection coverage.
3Speed
If the auxiliary movement detector continuously monitors for movement, then the detection responsiveness is improved, but the battery life is reduced
Solution Approach 1:
The system uses periodic polling with presence requests sent at predetermined intervals rather than continuous monitoring. The auxiliary detector only activates its sensor and processor when a presence request is received, maintaining the ability to detect movement quickly while keeping average power consumption low through the periodic nature of the polling cycle.
Solution Approach 2:
The master controller preliminarily sends a presence request before actual movement detection is needed, allowing the auxiliary detector to remain in low-power mode until the request arrives. This preliminary action structure ensures the system is ready to detect movement when needed while avoiding the energy waste of continuous sensor activation.
Data Source
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AI summary
A lighting control system (1) comprises: a communication bus (2); at least one extension movement detector (30) issuing detection pulses (DOS) over said communication bus in response to detecting a movement, at first time intervals (T1) determined by a sensor timer (34); one master luminaire (10) comprising a lamp (11) and a master controller (13) issuing master command signals (MCS) over said bus in response to detection pulses (DOS) received over said bus; and at least one slave luminaire (20) comprising a lamp (21) and a slave controller (23) being responsive to the master control signals (MCS) received over said bus to switch the corresponding lamp ON and OFF. Whenever the master controller receives a detection pulse, it starts a master timer (15) and switches the lamps ON. If the master timer times out (T2) without the master controller receiving any detection pulses, the master controller switches the lamps OFF.