Power Line Communication Modulation for Lighting Systems
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Solution Overview
Problem
Conventional lighting systems require additional control wires for bi-directional communication between power supplies and lighting components, increasing complexity and cost, especially in retrofit operations.
Innovation Solution
Implementing bi-directional power line communication techniques that modulate voltage or current to enable communication between power supplies and lighting components without additional wires, using modulation schemes such as switchable elements and adjustable voltage or current sources, allowing for full-duplex communication.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If additional control wires are used for bi-directional communication between power supplies and lighting components, then communication capability is improved, but device complexity and installation cost increase
Solution Approach 1:
The patent combines power transmission and communication functions into a single wire infrastructure. Power line communication modulates communication signals onto the power supply lines, allowing bidirectional data exchange between power supplies and lighting components without requiring separate control wires. This merging eliminates the need for additional wiring while maintaining full communication capability.
Solution Approach 2:
The power supply lines are made multi-functional by enabling them to carry both power transmission and communication signals simultaneously. The system uses modulation techniques to encode communication data on top of the power signal, allowing the same physical infrastructure to serve dual purposes: delivering electrical power to lighting components and enabling bidirectional control and status monitoring.
2Reliability
If additional control wires are installed for communication, then communication reliability is improved, but installation effort and error risk increase
Solution Approach 1:
By merging power and communication into a single wire system, the patent eliminates the need for separate control wire installation. This reduces installation effort, minimizes the risk of wiring errors, and simplifies the overall installation process while maintaining communication reliability through proven power line modulation techniques.
Solution Approach 2:
The existing power wire infrastructure serves dual purposes automatically. The system utilizes the already-installed power lines for both power delivery and communication, eliminating the need for additional installation work. The modulation and demodulation processes occur automatically at the power supply and lighting component ends, requiring no manual configuration of separate communication channels.
3Device complexity
If power line communication is implemented, then wiring complexity is reduced, but signal interference and noise may increase
Solution Approach 1:
The patent employs modulation techniques as an intermediary method to separate communication signals from power signals. By modulating communication data onto specific frequency ranges and using demodulation at the receiving end, the system effectively filters out power-related noise and interference, enabling reliable communication over the power lines without significant signal degradation.
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 approach reduces wiring efforts, eliminates the risk of wrong wiring, and allows for complex lighting controls and integration with building automation systems without the need for extra wires, while maintaining compatibility with legacy components.
Implementation Method 1
a modulation element to modulate one of current flow through the modulation element or voltage drop across an other element of the lighting system, so as to thereby provide an outgoing power line communication signal
Implementation Method 2
sense one of the amount of current flow through the other element or the amount of voltage drop across the other element so as to allow for receipt and interpretation of an incoming power line communication signal
Data Source
AI summary
Techniques are provided for bi-directional communication between a power supply and one or more light engines (and/or other lighting system components) via the existing power lines so that no additional communication wires are needed. In particular, the power supply can transmit information by modulating its output (voltage or current) and the light engine (or other lighting componentry, such as a sensor) can communicate back by modulating how much power it draws from the power supply. Any suitable type of modulation scheme can be used, and a master-slave arrangement can be used to control the bi-directional communication if so desired, so as to avoid multiple devices communicating over the power line communication channel at the same time. Other embodiments allow a multiple simultaneous communications over the power line communication channel.