High-Capacity Common-Mode Inductor Circuit for Network Signal Noise Filtering
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Solution Overview
Problem
Conventional network connectors face challenges in effectively filtering high-frequency noise and eliminating low-frequency noise during network signal transmission, especially in high-performance computer systems, leading to instability and increased power consumption due to electromagnetic interference.
Innovation Solution
A high-capacity common-mode inductor processing circuit is developed, featuring multiple high-capacity common-mode inductors with parasitic capacitances between their primary and secondary sides, and autotransformers connected to a ground side, replacing traditional coupling capacitors to simplify the circuit and reduce manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple coupling capacitors and autotransformers are connected in series in conventional network connectors, then noise filtering and lightning protection functions are achieved, but the circuit complexity increases and performance in high-frequency transmission and low-frequency noise elimination is poor
Solution Approach 1:
The patent combines the coupling capacitor and common-mode inductor into a single integrated component structure. The inductor includes primary and secondary windings with a shared magnetic core, where the parasitic capacitance between windings serves as the coupling mechanism, eliminating the need for separate coupling capacitors in the circuit.
Solution Approach 2:
The common-mode inductor is designed to perform multiple functions simultaneously: it provides common-mode noise filtering through its magnetic core structure, differential-mode signal coupling through parasitic capacitance between windings, and lightning protection through its high current tolerance. This multi-functional design replaces what previously required multiple separate components.
2Object-affected harmful factors
If conventional network connectors use multiple filter components, then specific noise filtering is achieved, but the circuit is not simple enough and has poor performance in high-frequency transmission
Solution Approach 1:
The patent optimizes the parasitic capacitance value between the primary and secondary windings by adjusting winding parameters such as turn spacing, wire diameter, and winding density. This controlled parasitic capacitance serves as the coupling mechanism for high-frequency signals, improving transmission performance while maintaining noise filtering capability.
3Power
If high-performance computers with high current transmission are used, then computing power and speed are improved, but significant electromagnetic interference and power consumption increase
Solution Approach 1:
The patent utilizes the parasitic capacitance that naturally exists between the primary and secondary windings of the common-mode inductor as a beneficial coupling mechanism for signal transmission. Instead of treating parasitic capacitance as an unwanted effect to be minimized, the design harnesses it for its coupling function, eliminating the need for separate coupling capacitors and reducing overall circuit 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 solution effectively filters out both differential-mode and common-mode noise, improving signal stability and transmission speed, particularly in high-frequency networks, while reducing power consumption and manufacturing costs.
Implementation Method 1
common-mode inductors that can perform noise filtering or lightning protection
Implementation Method 2
each high-capacity common-mode inductor is disposed between each two adjacent circuit channels for signal coupling, and has at least one parasitic capacitance existing between a primary side and a secondary side thereof
Data Source
AI summary
A high-capacity common-mode inductor processing circuit for network signal is disclosed. Each of high-capacity common-mode inductors is disposed between two adjacent circuit channels to perform signal coupling, and each high-capacity common-mode inductor has parasitic capacitance between primary and secondary sides thereof, each of autotransformers is disposed on a side of corresponding one of the high-capacity common-mode inductors, and center tap lines of the autotransformers are grounded. The high-capacity common-mode inductor includes an iron core post and an iron core cover, the iron core post includes a winding part to be wound by conductive wires, and the conductive wires are wound on the winding part by a preset number of turns, and upwardly stacked and wound on the winding part by a preset layer number. The high-capacity common-mode inductors and the parasitic capacitances can eliminate noise on the circuit channels and perform signal coupling.