Power Line Communication Coupling System Impedance Matching
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Solution Overview
Problem
The existing coupling systems struggle to accurately distinguish and transmit data from a signal that also carries an electrical power supply, leading to corrupted data transmission due to impedance mismatch between the system's input impedance and the characteristic impedance of the line.
Innovation Solution
The coupling system includes an energy recovery device and a data transmission device with specific components like rectifiers, current generators, attenuators, and filters, which adapt the input impedance to match the characteristic line impedance, ensuring efficient power supply recovery and data transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the coupling system recovers electrical power supply from the signal, then power supply delivery to control unit is enabled, but input impedance mismatch with line characteristic impedance occurs causing data corruption
Solution Approach 1:
The coupling system is divided into separate functional modules: a power recovery module that extracts electrical power from the signal, and a data transmission module that handles data signals. This segmentation allows each module to be optimized independently, with the power recovery module designed to efficiently extract power while the data module maintains proper impedance matching to prevent corruption.
Solution Approach 2:
An impedance matching network is introduced as an intermediary component between the coupling system and the communication line. This mediator adjusts the input impedance to match the line's characteristic impedance, preventing signal reflections and data corruption while allowing the power recovery function to operate independently.
2Loss of information
If the coupling system attempts to distinguish and separate data from power supply signal, then data transmission is enabled, but data corruption occurs due to impedance mismatch
Solution Approach 1:
The coupling system separates power recovery and data reception into distinct functional paths. The data reception path includes dedicated impedance matching components that ensure proper signal integrity, while the power recovery path handles electrical power extraction independently, preventing interference between the two functions.
Solution Approach 2:
Different parts of the coupling system have different impedance characteristics optimized for their specific functions. The data input section is designed with impedance matching to the line's characteristic impedance for optimal data reception, while the power recovery section has different characteristics optimized for efficient power extraction, allowing each part to perform its function without compromising the other.
3Adaptability or versatility
If the coupling system is designed to handle both power supply and data simultaneously, then dual functionality is achieved, but impedance matching becomes difficult causing signal corruption
Solution Approach 1:
The multi-functional coupling system is segmented into separate power recovery and data communication subsystems, each with its own impedance matching network. This allows precise impedance control for data transmission while maintaining power recovery capability, achieving both functions with high precision without mutual interference.
Solution Approach 2:
The coupling system is designed as a universal interface that can simultaneously handle power supply and data transmission functions. By incorporating multiple specialized modules within a single device, the system achieves multi-functionality while maintaining high impedance matching precision for data signals through dedicated matching circuits.
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 adaptation significantly reduces data corruption, allowing for reliable data transmission to the control unit while maintaining efficient power supply delivery, with an input impedance matching the line impedance within a predetermined frequency range.
Implementation Method 1
a rectifier 32, a current generator 34 and a variable load 36
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
This system (8) for coupling between a wire communication link (10) exhibits a characteristic line impedance suitable for transporting a single signal simultaneously comprising an electrical power supply and data, and a control unit (6) comprising an electrical power supply terminal (12) and a data terminal (14), said system (8) exhibiting an input impedance. This system (8) comprises means (34, 36, 42) for adapting the input impedance so as to match the characteristic line impedance.