Cross-Phase Adapter for PLC Signal Attenuation
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Solution Overview
Problem
Home entertainment systems using power line communication (PLC) networks experience significant signal attenuation due to cross-phase communication between PLC transmitters and receivers plugged into different AC power lines (L1 and L2), resulting in reduced network bandwidth.
Innovation Solution
A cross-phase adapter that connects the L1 and L2 lines using a coupler, repeater-amplifier, or bridge to reduce signal attenuation and block noise from 240-volt appliances, housed in a 240-volt plug and socket configuration with a switch to selectively interconnect the lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If PLC transmitter and receiver are plugged into different AC power lines (L1 and L2), then cross-phase communication occurs, but significant signal attenuation (twenty decibels or more) results
Solution Approach 1:
The patent introduces a phase coordination device as an intermediary component that connects to the power distribution box and actively manages phase information. This mediator captures phase data from multiple power lines, determines optimal phase relationships, and coordinates signal transmission to avoid cross-phase attenuation, thereby resolving the contradiction between communication capability and signal reliability
Solution Approach 2:
The system dynamically adjusts transmission parameters based on real-time phase conditions. The phase coordination device continuously monitors power line phases and modifies communication signals adaptively, switching between different phase configurations as needed to maintain optimal signal strength and avoid the fixed-phase limitation that causes attenuation
2Power
If 240 volt appliances are connected to the power grid, then power supply capability is enhanced, but noise propagates to PLC receivers
Solution Approach 1:
The phase coordination device extracts and separates noise components from the power line signals. By identifying and isolating noise generated by 240-volt appliances, the system can filter out these harmful factors while preserving the useful power transmission and PLC communication signals, thus resolving the contradiction between power capability and noise interference
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
The adapter significantly reduces signal attenuation, enhances communication reliability, and prevents noise propagation from 240-volt appliances, maintaining high network bandwidth without requiring new wiring or electrical expertise.
Implementation Method 1
cross phase communication occurs that can result in significant signal attenuation
Implementation Method 2
means can also be provided for impeding noise from a 240 volt appliance from propagating to the receiver
Data Source
AI summary
An adapter to reduce the effects of cross phase communication between a PLC transmitter plugged into one of the L1 or L2 power lines of a home and a PLC receiver plugged into the opposite L2 or L1 power line includes a housing with one side configured as a 240 volt plug and an opposite side configured as a 240 volt, so that the adapter can be plugged into a 240 volt wall socket and a 240 volt appliance plugged into the adapter. A coupler or a repeater is in the adapter and extends between the L1 and L2 lines to reduce attenuation of a communication signal from the transmitter or alternatively to amplify the signal and send it on to the receiver. A high frequency filter can be interposed between the coupler and the 240 volt appliance to prevent noise from the appliance from entering the communication signal and for preventing communication signals from entering the appliance.