Power Line Communication Control System Using Time-Division Multiplexing
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Solution Overview
Problem
Conventional control systems using power line communication face high signal interference, large power consumption, poor compatibility with loads, and significant signal distortion, especially when power lines are long.
Innovation Solution
A control system with a controller connected to live and neutral lines, using switches and a coupler for differential signaling, allowing grid power transmission during ON states and communication signal transmission during OFF states, with matching devices to reduce reflections and noise, and employing differential signaling techniques to minimize interference and power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If power lines are used for both power transmission and signal transmission simultaneously, then communication functionality is achieved, but signal interference from grid power becomes high
Solution Approach 1:
The patent implements time-division multiplexing where the power lines alternately transmit power and communication signals. The controller switches between power transmission mode and communication signal transmission mode periodically, allowing both functions to share the same medium without continuous interference. This resolves the contradiction by separating the harmful power transmission and useful communication transmission in time rather than space.
2Reliability
If continuous power transmission is maintained, then load operation is ensured, but power consumption of the control system increases
Solution Approach 1:
The controller alternates between power transmission intervals and communication signal transmission intervals. During communication intervals, power transmission is temporarily suspended, allowing the control system to reduce power consumption while still maintaining load operation through periodic power delivery. This periodic switching resolves the contradiction between continuous power supply reliability and power consumption reduction.
3Ease of manufacture
If standard power line connection is used, then ease of installation is maintained, but compatibility with different loads becomes poor
Solution Approach 1:
The patent enables the power lines to serve multiple functions: power transmission, communication signal transmission, and impedance matching. The controller and matching devices allow the same physical infrastructure to adapt to different load requirements while maintaining simple installation. This multi-functionality resolves the contradiction between installation simplicity and load compatibility.
4Length of stationary object
If long power lines are used to extend coverage, then service area is increased, but signal distortion becomes serious
Solution Approach 1:
The patent introduces matching devices as intermediaries between the controller and long power lines. These matching devices impedance-match the communication signals to the characteristic impedance of the long power lines, reducing signal reflections and distortion. This intermediary component enables long power line usage while maintaining signal quality, resolving the contradiction between extended coverage and signal integrity.
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 solution reduces signal interference and power consumption, enhances compatibility with loads, and minimizes signal distortion over long power lines, ensuring efficient and reliable communication and power transmission.
Implementation Method 1
a coupler connected to the first and second power lines, receives a communication signal, and couples the communication signal to the first and second power lines
Data Source
AI summary
A control system includes a control device adapted to be connected to a live line and a neutral line that transmit a grid power, and to a load via a first power line and a second power line. The control device includes: a first switch adapted to be connected between the live line and the first power line; a second switch adapted to be connected between the neutral line and the second power line; a coupler adapted to be connected to the first power line, receiving a communication signal, and coupling the communication signal to the first power line; and a controller controlling the first and second switches to synchronously alternate between an ON state and an OFF state, and outputting the communication signal to the coupler when the first and second switches operate in the OFF state.