Switched Amplifier TDD Routing for Power Cable Data Links
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Solution Overview
Problem
Existing power line communication systems face challenges such as transformer interference, limited bandwidth, susceptibility to radio interference, and the inability to install bi-directional communication systems without disrupting power services, especially in regions with low population density and topographical barriers.
Innovation Solution
The method involves using a transverse magnetic wave device to transmit data signals over medium voltage power cables, employing a time division duplex mode and a switched amplifier system to amplify signals in both directions, while keeping control signals outside the data transmission frequency range to minimize interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If standard PLC systems are used for data transmission over power lines, then existing infrastructure can be utilized, but transformer interference and radio interference susceptibility occur
Solution Approach 1:
The patent introduces a switched amplifier system as an intermediary device that actively manages signal transmission on power lines. This amplifier system includes switching logic that responds to control signals, enabling selective amplification of data transmissions while filtering out interference from transformers and radio sources, thus resolving the contradiction between using existing infrastructure and maintaining signal reliability
2Adaptability or versatility
If bi-directional communication systems are installed on power lines, then data transmission in both directions is enabled, but power services are disrupted
Solution Approach 1:
The patent employs dynamic switching logic that actively responds to control signals to route data transmissions in different directions through appropriate paths. This dynamic control enables bi-directional communication while maintaining continuous power service by selectively activating communication functions without disrupting the primary power transmission function of the lines
3Productivity
If amplifier systems amplify signals in both directions simultaneously, then communication efficiency is improved, but interference between directions occurs
Solution Approach 1:
The patent implements periodic action through time-division multiplexing where the amplifier system alternates between amplifying signals in different directions based on control signals. The switching logic enables amplification in one direction during specific time intervals and switches to the other direction in subsequent intervals, eliminating simultaneous interference while maintaining high communication efficiency through coordinated bidirectional operation
4Device complexity
If control signals are placed within the data transmission frequency range, then channel utilization is maximized, but signal interference increases
Solution Approach 1:
The patent applies segmentation by dividing the frequency spectrum into distinct segments: one for data transmission and another for control signals. This frequency segmentation allows control signals to operate in a separate band from data transmissions, eliminating interference while maintaining efficient channel utilization through dedicated frequency allocation for different signal types
Data Source
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AI summary
In one embodiment, a switched amplifier is provided to amplify a data transmission. The switched amplifier may use a control signal that is received via a control signal channel in a transmission cable. Also, the switched amplifier may detect signal power to determine whether the data transmission is received at one of a first port and a second port. Data transmissions via the data transmission channel occur in a first direction and a second direction in a same frequency range in a time division multiplex (TDD) mode. Also, the control signal and data transmission are diverted from the transmission cable that transmits a type of signal different from the control signal and the data transmission. The switched amplifier is controlled based on the control signal or the signal power detected. The amplified signal is diverted in the first direction or the second direction via the data transmission channel back to the transmission cable.