Power-Over-Coax Circuit for Analog Video and DC Isolation
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Solution Overview
Problem
Existing Power Over Ethernet (POE) solutions require digitalization of images before transmission, leading to high costs, and are infeasible for applications involving numerous coaxial cables, such as in the monitoring field.
Innovation Solution
A back-end and front-end circuit design for analogue video signals and direct current power transmission over coaxial cables, using capacitors and diodes to isolate and superimpose power and video signals, reducing interference and enabling simultaneous transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If Power Over Ethernet (POE) solution is used to transmit network data and power, then power supply convenience is improved, but cost increases due to digitalization requirement and compatibility issues with coaxial cables
Solution Approach 1:
The patent introduces an intermediary circuit design that enables simultaneous transmission of power and analogue video signals through existing coaxial cables without requiring digital conversion infrastructure. The circuit uses impedance matching and signal separation techniques to allow power and video signals to coexist on the same cable, eliminating the need for POE digitalization while maintaining power supply convenience.
Solution Approach 2:
The patent makes the coaxial cable serve multiple functions simultaneously: power transmission, analogue video signal transmission, and maintaining backward compatibility with existing monitoring systems. This multi-functionality approach eliminates the need for separate power and data cables, reducing cost while preserving ease of operation in existing coaxial infrastructure.
2Ease of operation
If POE solution is adopted for network transmission, then centralized power supply is improved, but adaptability deteriorates due to infeasibility in coaxial cable environments
Solution Approach 1:
The patent changes the transmission parameter approach by enabling simultaneous transmission of power and analogue video signals through impedance matching and frequency separation techniques on coaxial cables. This allows the system to adapt to coaxial cable environments while maintaining centralized power supply capabilities, resolving the compatibility issue between POE and coaxial infrastructure.
Solution Approach 2:
The patent segments the signal transmission by separating power transmission paths from video signal paths within the same coaxial cable infrastructure. Through circuit design that uses impedance matching networks and signal isolation, the system allows both power and video signals to coexist without interference, enabling adaptability to coaxial environments while maintaining centralized power control.
3Device complexity
If analogue video signals and power are transmitted simultaneously on coaxial cables, then cost is reduced and construction time is shortened, but signal interference may increase
Solution Approach 1:
The patent uses intermediary circuit elements including impedance matching networks and signal isolation components that act as mediators between power and video signals. These intermediaries prevent direct coupling and interference while allowing simultaneous transmission on the same coaxial cable, thus reducing cost without significantly increasing signal interference.
Solution Approach 2:
The patent applies local quality control by implementing frequency-selective impedance matching and localized signal isolation at specific points in the transmission path. This allows different parts of the transmission system to have optimized characteristics for their specific functions (power vs. video), reducing interference locally while maintaining overall system simplicity and cost-effectiveness.
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
Reduces costs and shortens construction time by allowing simultaneous transmission of analogue video and direct current power over coaxial cables without digital conversion, maintaining signal integrity and reducing signal distortion.
Implementation Method 1
an analogue video signal passing circuit configured to block the direct current power and let the analogue video signal pass
Implementation Method 2
a direct current power passing circuit configured to block the analogue video signal and let the direct current power pass
Data Source
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AI summary
The disclosure discloses a back-end circuit for processing an analogue video signal and direct current power, a front-end circuit for processing an analogue video signal and direct current power and a Power Over Coaxia (POC) circuit for an analogue video signal. Each of the back-end processing circuit and the front-end processing circuit includes an analogue video signal passing circuit configured to block the direct current power and let the analogue video signal pass and a direct current power passing circuit configured to block the analogue video signal and let the direct current power pass, so that the analogue video signal may be isolated from the direct current power and the analogue video signal may be superimposed to the direct current power without mutual influence and exclusion to realize a function of superimposing the direct current power on an analogue high-definition video cable. Obviously, the back-end processing circuit and the front-end processing circuit are electrically connected with two ends of a coaxial cable respectively to implement simultaneous transmission of the direct current power and the analogue video signal on the coaxial cable, so that cost is reduced, and moreover, construction time is shortened.