PLC Emergency Lighting Fixture for Reduced Cabling
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Solution Overview
Problem
Existing emergency lighting systems require additional cabling for implementing inhibition and rest modes, adding installation complexity and cost.
Innovation Solution
A lighting fixture with a driver configured to operate in four modes (normal, emergency, rest, and inhibition) that uses power-line communication (PLC) data to control mode transitions, eliminating the need for additional cabling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If additional cabling is added to implement inhibition mode and rest mode controls, then the lighting system can achieve proper mode control, but the installation complexity and cost increase
Solution Approach 1:
The patent uses existing power supply cabling as an intermediary medium to carry both power and control signals. The controller embedded in the lighting fixture modulates the power supply line to transmit inhibition mode and rest mode control commands, eliminating the need for separate control cables while maintaining full mode control functionality.
Solution Approach 2:
The power supply cable is made multi-functional by enabling it to carry both electrical power and digital control signals simultaneously. The controller within the lighting fixture processes both power reception and PLC signal detection through the same electrical input, allowing a single cable to perform multiple functions.
2Device complexity
If Power-Line Communication (PLC) is used for mode control, then installation complexity is reduced, but the system must detect and process communication signals from the power line
Solution Approach 1:
The controller merges the power supply reception function and PLC signal detection function into a single integrated component. The same electrical input that receives power also detects modulated PLC signals, and the controller processes both functions simultaneously through unified signal processing circuits, simplifying the overall system architecture.
Solution Approach 2:
The lighting fixture's existing power input circuitry serves dual purposes by automatically detecting and processing PLC control signals embedded within the power supply waveform. The system uses its own power reception infrastructure to also receive control commands, eliminating the need for separate detection hardware.
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
Simplifies installation by enabling mode control through PLC, providing visual feedback and automatic mode transitions without extra user operations, thus reducing installation complexity and costs.
Implementation Method 1
the driver is configured to detect and receive power-line communication (PLC) data at the electrical input
Data Source
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AI summary
A lighting fixture 100 is configured to receive power-line communication command (PLCC) data through at least one electrical input. One example PLCC will set the lighting fixture to an inhibition mode, that prevents the transition from a normal mode to an emergency mode. The PLCC may be sent by a controller 201 installed between a main switchboard 200 and the at least one lighting fixture 100. The lighting fixture 100 comprises a driver that is configured to parse the PLCC data and drive the lighting fixture 100 to the rest mode instead to the emergency mode, when the main switchboard 200 is unable to deliver power to the system (i.e., a wanted maintenance break) . When the controller 201 is installed in series as in the example embodiment, the need for extra cable installation for the rest mode and the inhibition mode is no longer needed.