PLC Circuit Isolation Structure for Stable Impedance and Low Noise
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Solution Overview
Problem
Power line communication (PLC) is affected by noise and impedance variations due to power consumption units, leading to poor communication quality and signal attenuation, especially in environments with heavy loads.
Innovation Solution
A circuit structure is introduced that uses a low-pass filter or isolator to separate the power line into transmission and power consumption sections, with the communication signal bypassing the filter through a coupler, isolating noise and impedance variations, and adding filters at power supply apparatus entrances and exits to prevent interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a low-pass filter or isolator is used to separate the power line into sections, then the influence range of power consumption apparatus is reduced, but the communication signal transmission distance is still limited by noise and impedance variations
Solution Approach 1:
The power line is segmented into multiple isolated sections using isolators positioned between power consumption units. Each section becomes an independent transmission medium with stable impedance characteristics, preventing noise and impedance variations from propagating across the entire line. This segmentation enables reliable communication over longer distances by creating multiple stable transmission zones.
Solution Approach 2:
Isolators are introduced as intermediary devices between power consumption units and the power line. These isolators act as mediators that block harmful noise and impedance variations while allowing communication signals to pass through, thereby extending the effective transmission distance without sacrificing communication quality.
2Use of energy by moving object
If power consumption units are present on the power line, then power supply function is provided, but communication quality deteriorates due to noise and impedance variations
Solution Approach 1:
The power line is divided into isolated sections with isolators placed between power consumption units and communication units. This segmentation allows power consumption units to operate independently without affecting communication quality in other sections, maintaining both power supply function and communication reliability simultaneously.
Solution Approach 2:
The harmful effects (noise and impedance variations) are extracted and isolated from the communication path using isolators. The isolators remove these detrimental factors while allowing the power supply function to continue operating, thereby separating the power delivery function from the communication function to eliminate interference.
3Power
If heavy load (low impedance) state occurs on the power line, then power consumption capacity is increased, but signal transmission is highly attenuated and difficult to transmit over longer distances
Solution Approach 1:
The power line is segmented into isolated sections using isolators, which prevent the low impedance condition from one section from affecting other sections. Each section maintains its own impedance characteristics, allowing heavy load operation in one section without causing signal attenuation in other sections, thereby preserving transmission capability across the network.
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 structure improves communication reliability by maintaining stable impedance and low noise levels, allowing for effective signal transmission over longer distances with reduced interference.
Implementation Method 1
The low-pass 3 dB frequency turning point of this filter is much lower than the communication signal, so that the communication signal can be isolated without affecting the power supply
Implementation Method 2
a first isolator and a first coupler. The first isolator is disposed at an entrance of a power consumption terminal of the circuit structure. The first isolator separates the power line into the power consumption terminal and a transmission terminal
Implementation Method 3
The first coupler generates a first coupling path, through which the network signal enters the transmission terminal via the first coupler without passing through the first isolator
Data Source
AI summary
A circuit structure to improve reliability of power line communication has a power line, on which a power energy wave and a network signal are transmitted. The circuit structure includes: a first isolator, which is disposed at an entrance of a power consumption terminal of the circuit structure, separates the power line into the power consumption terminal and a transmission terminal, and filters the network signal, so that the power energy wave enters the power consumption terminal; and a first coupler for generating a first coupling path, through which the network signal enters the transmission terminal via the first coupler without passing through the first isolator. Power line impedance at a side of the transmission terminal is not affected by a side of the power consumption terminal.