Low Voltage PLC Bridge Modulation for Power Line Noise Reduction
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Solution Overview
Problem
Power line communications using medium voltage power lines face challenges such as electrical noise, difficulty in introducing and extracting RF signals, and high installation costs due to the need for specialized electricians, making it advantageous to provide broadband communications over low voltage power lines instead.
Innovation Solution
A low voltage power line communications system comprising a LV power line, Internet access, a LV PLC bridge, and LV PLC clients, where the LV PLC bridge modulates and demodulates Ethernet communications using the HomePlug 1.0 specification to transmit data over the power line, and the LV PLC client manages quality of service and authentication, with a manager for bandwidth access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If medium voltage power lines are used for PLC, then power distribution infrastructure is utilized, but electrical noise and difficulty in RF signal introduction/extraction occur
Solution Approach 1:
The system segments the power distribution infrastructure by utilizing only the low voltage portion (customer premises to transformer) for communications, while leaving the medium voltage transmission portion unchanged. This segmentation isolates the communication signals from the noisy medium voltage lines while still leveraging the existing power infrastructure for backhaul connectivity.
Solution Approach 2:
The transformer acts as an intermediary device that converts medium voltage power lines to low voltage power lines, thereby converting the communication domain from noisy medium voltage RF signals to cleaner low voltage signals that are easier to handle for broadband communications.
2Adaptability or versatility
If medium voltage power lines are used for PLC, then power distribution system is reused, but high installation costs due to specialized electricians are incurred
Solution Approach 1:
The system segments the power distribution system usage, allowing standard low voltage electricians to work on the low voltage portion for communications installation, while the medium voltage portion remains untouched and can be handled by existing power company infrastructure teams, thereby reducing specialized labor costs.
Solution Approach 2:
The system employs inexpensive low voltage PLC equipment and standard electrician labor for installations, replacing the need for expensive specialized medium voltage electricians and equipment, thereby significantly reducing installation costs while maintaining adequate system performance.
3Productivity
If RF signals are introduced onto MV power lines, then information delivery is achieved, but technical challenges in signal introduction and extraction occur
Solution Approach 1:
The transformer serves as an intermediary that simplifies the signal conversion process by transforming medium voltage RF signals to low voltage signals, thereby reducing the technical complexity of signal introduction and extraction operations while maintaining information delivery capability.
Solution Approach 2:
The system replaces complex RF signal handling mechanisms with simpler low voltage signal processing techniques, substituting the need for complex RF coupling and decoupling mechanisms with more straightforward low voltage signal introduction and extraction methods.
4Adaptability or versatility
If MV power lines are used for broadband communications, then existing infrastructure is utilized, but filtering of high frequency signals becomes difficult
Solution Approach 1:
The system segments the power line infrastructure into medium voltage transmission lines and low voltage distribution lines, utilizing the low voltage portion for broadband communications where signal filtering is more effective and easier to implement, while leaving the medium voltage lines for power transmission only.
Solution Approach 2:
The system changes the voltage parameter from medium voltage to low voltage for the communication segment, thereby improving the suitability for broadband communications and simplifying signal filtering operations while still leveraging the existing power line infrastructure.
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
Enables reliable and cost-effective broadband communications over low voltage power lines, reducing noise interference and installation costs while providing secure and managed internet access to customers.
Implementation Method 1
the LV PLC bridge modulates and demodulates Ethernet communications using the HomePlug 1.0 specification to transmit data over the power line
Data Source
AI summary
A power line communications (PLC) system and method for providing broadband communications over a low voltage power line are disclosed. The system and method comprise a manager that controls access to a bridge for a client where the bridge communicates with the manager to provide the client Internet access. The bridge modulates Ethernet communications from the Internet access to the low voltage power line to provide the modulated Ethernet communications to the client and the client demodulates modulated Ethernet communications from the low voltage power line to yield Ethernet communications.