Two-Wire DC Power and Signal Transmission for Long-Distance Links
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Solution Overview
Problem
Existing technologies face challenges in transmitting DC power supply and signals over long distances using a pair of wires, due to interference and limited communication distance, especially at lower voltage levels like 24 VDC, 18 VDC, and 12 VDC.
Innovation Solution
A method and system that utilize a pair of wires to transmit DC power supply and signals by modulating digital signals onto the power supply lines, where one wire acts as the power supply (VCC) and the other as the ground (GND), and reversing the connections based on the signal level, allowing for effective communication and power supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If digital signals are loaded onto the power supply wire for transmission, then communication function is achieved, but the communication distance is limited due to voltage drop and electromagnetic interference
Solution Approach 1:
Instead of loading digital signals directly onto the DC power wire which causes voltage drop and interference, the patent inverts the approach by using the DC power wire to drive a local power supply that generates clean digital carrier waves. The communication signals are then modulated onto these locally generated carriers at the communication module, eliminating the voltage drop issue while achieving long-distance communication.
Solution Approach 2:
The patent introduces an intermediary local power supply module that receives power from the DC wire and converts it to clean digital carrier waves. This intermediary converts the problematic direct signal transmission into a two-stage process: power transmission followed by local signal generation, thereby eliminating electromagnetic interference and extending communication distance.
2Device complexity
If a pair of wires is used for both DC power supply and digital signal transmission, then wiring complexity is reduced, but anti-interference capability deteriorates
Solution Approach 1:
The patent segments the transmission functions by separating power transmission from signal transmission. The DC power wire exclusively transmits power to a local power supply module, while digital communication signals are generated locally through modulation of carrier waves. This segmentation eliminates the harmful interaction between power and signal wires, achieving strong anti-interference capability while maintaining simple wiring.
Solution Approach 2:
Each communication module serves itself by generating its own digital carrier waves locally through the local power supply module. This self-service approach eliminates the need for long-distance signal transmission over the power wire, thereby reducing electromagnetic interference while maintaining wiring simplicity.
3Use of energy by moving object
If lower voltage DC power supply is used (24V, 18V, 12V), then safety and energy efficiency are improved, but anti-interference capability and transmission distance are reduced
Solution Approach 1:
The patent applies preliminary anti-action by pre-generating strong digital carrier waves at the local power supply module before modulation. This preliminary generation of high-amplitude carriers ensures that even when using low-voltage DC power supply (12V, 18V, or 24V) for energy efficiency and safety, the resulting communication signals have sufficient amplitude and anti-interference capability to achieve long transmission distances.
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 approach enhances the anti-interference capability and extends the communication distance, enabling reliable digital communication and power supply over longer distances while maintaining consistency with the amplitude of the DC power signal.
Implementation Method 1
a data sending end communicates to a data receiving end unidirectionally at the same time... when the digital signal sent by the data sending end is at a high level, the wire A is connected with a positive pole of the power supply, the wire B is connected with a ground of the power supply, when the digital signal sent by the data sending end is at a low level, the wire A is connected with the ground of the power supply, and the wire B is connected with the positive pole of the power supply
Data Source
AI summary
A method and a system for transmitting DC power supply and signals by using a pair of wires, wherein the DC power supply adopts a pair of wires to supply power to electric equipment, and a data sending end communicates to a data receiving end unidirectionally; the data sending end is positioned at the DC power supply, the data receiving end is positioned at an electric equipment end; at power supply end, a pair of wires is divided into wire A and wire B, when digital signal sent by data sending end is at a high level, wire A is connected with positive pole of power supply, wire B is connected with ground of power supply, when digital signal sent by data sending end is at a low level, wire A is connected with ground of power supply, and wire B is connected with positive pole of power supply.