Internet Interface Protection Circuit for TV
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Solution Overview
Problem
Internet television interfaces are vulnerable to damage from large common-mode and differential-mode interference voltages, which can affect or damage network signal processing chips, especially when exposed to outdoor conditions during lightning storms.
Innovation Solution
An internet interface protecting circuit is designed with isolating transformers and interference defending circuits, including diodes and resistors, to separate and clamp interference voltages, protecting the network signal processing chip from common-mode and differential-mode interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If isolating transformers are used to separate the ethernet interface from the network signal processing chip, then the network signal processing chip is protected from direct interference, but the circuit complexity increases
Solution Approach 1:
The patent introduces isolating transformers as intermediary components between the ethernet interface and the network signal processing chip. These transformers provide galvanic isolation, preventing interference voltages from directly reaching the sensitive processing chip while maintaining signal transmission functionality.
Solution Approach 2:
The circuit is divided into isolated segments using multiple transformers (first isolating transformer for receiving data, second isolating transformer for sending data). This segmentation allows each component to be protected independently while maintaining overall system functionality.
2Reliability
If catching diodes and resistors are added to defend against interference voltages, then the protection capability against common-mode and differential-mode interference is improved, but the manufacturing cost increases
Solution Approach 1:
The patent incorporates catching diodes and resistors in advance within the interference defending circuits to clamp and limit interference voltages before they can reach and damage the network signal processing chip. This preventive measure protects the chip from both common-mode and differential-mode interference.
Solution Approach 2:
The patent uses relatively inexpensive components such as catching diodes and resistors that can be easily replaced if needed, rather than using expensive high-voltage protection devices. These components provide adequate protection at low cost.
3Reliability
If more protection components are added to the circuit, then the protection capability is improved, but the circuit structure becomes more complex
Solution Approach 1:
The patent combines multiple protection functions into integrated interference defending circuits. The first interference defending circuit protects the receiving data end, while the second interference defending circuit protects the sending data end. These circuits are systematically organized to provide comprehensive protection without excessive complexity.
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 circuit effectively defends against common-mode and differential-mode interference, preventing damage to the network signal processing chip while maintaining a low cost and simple structure, ensuring reliable network function in internet television systems.
Implementation Method 1
the first isolating transformer T11 is used for separating a receiving data end of the ethernet interface 101 from the network signal receiving chip 102; the second isolating transformer T12 is used for separating a sending data end of the ethernet interface 101 from the network signal receiving chip 102
Implementation Method 2
a first catching diode ZD1, a second catching diode ZD2... a cathode of the first catching diode ZD1 is connected with a first end of a secondary side coil of the first isolating transformer T21; a cathode of the second catching diode ZD2 is connected with a second end of a secondary side coil of the first isolating transformer T21
Data Source
Figure 1
Figure 2
AI summary
The present disclosure provides an internet interface circuit, which includes an ethernet interface, a first isolating transformer, a second isolating transformer, a network signal processing chip and a first interference defending circuit; the ethernet interface is used for receiving and sending a network signal; the first isolating transformer is used for separating a receiving data end of the ethernet interface from the network signal receiving chip; the second isolating transformer is used for separating a sending data end of the ethernet interface from the network signal receiving chip; the first interference defending circuit is used for defending common-mode interference and differential-mode interference of the receiving data end of the ethernet interface; the network signal processing chip is used for processing the network signal. The present disclosure also provides a television. The internet interface protecting circuit of the present disclosure can defend the common-mode interference and differential-mode interference; and the present disclosure also has the advantages of low cost, simple circuit structure, and easily to be achieved.