Transmission Line Filtering Module Using DIP Chokes
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Solution Overview
Problem
Transmission lines often act as mediums for conduction and coupling noises, which existing technologies struggle to suppress effectively across a wide frequency range without using ferrite cores, leading to size and cost issues.
Innovation Solution
A transmission line equipped with a filtering module that includes common and differential chokes, inductors, capacitors, and capacitors coupled to a metallic shield, utilizing surface mounting technology and dual in-line package elements to filter out common and differential mode noises without ferrite cores, allowing for miniaturization and reduced costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a ferrite core is used to suppress coupling noise, then noise suppression effectiveness is improved, but device size increases and cost increases
Solution Approach 1:
The patent changes the packaging parameters of the common mode choke from traditional large-size forms to a compact dual in-line package (DIP) configuration. This parameter change in packaging style allows the same noise suppression function to be achieved with significantly reduced volume, directly resolving the contradiction between noise suppression effectiveness and device size.
Solution Approach 2:
The patent uses a DIP common mode choke that replicates the functional characteristics of traditional ferrite core solutions while adopting a different physical packaging form. This copied function with modified packaging achieves the same noise suppression performance without the size penalty of traditional ferrite cores.
2Object-affected harmful factors
If a ferrite core is used to suppress coupling noise, then noise suppression effectiveness is improved, but manufacturing cost increases
Solution Approach 1:
The patent replaces expensive ferrite core materials with a DIP common mode choke packaging structure that uses more cost-effective materials and manufacturing processes. This substitution achieves comparable noise suppression at lower cost, directly addressing the contradiction between noise suppression effectiveness and manufacturing cost.
Solution Approach 2:
By changing the packaging parameters to DIP configuration, the patent enables mass production compatibility and reduces material costs while maintaining the noise suppression function, thereby resolving the cost contradiction.
3Object-generated harmful factors
If a traditional filtering circuit is used on PCB, then conduction noise is filtered out, but coupling noise suppression is insufficient
Solution Approach 1:
The patent merges the functions of conduction noise filtering and coupling noise suppression into a single DIP common mode choke component. This integrated component simultaneously addresses both noise types, resolving the contradiction where traditional PCB filtering circuits could handle conduction noise but failed to suppress coupling noise effectively.
4Object-affected harmful factors
If a ferrite core is used for noise suppression, then high-frequency noise is attenuated, but the device cannot suppress noises in a wide frequency range
Solution Approach 1:
The DIP common mode choke is designed with multi-functional capabilities to suppress noises across a wide frequency range, not limited to high frequencies only. This universal noise suppression capability resolves the contradiction by providing both high-frequency attenuation and broad frequency range coverage through a single component.
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 suppresses both conduction and coupling noises, reducing radiation intensity and meeting electromagnetic compatibility requirements, as demonstrated by interference testing results showing reduced noise levels across various frequency ranges.
Implementation Method 1
a common choke coupled to first, second, third and fourth wires of the transmission line for filtering out common mode noises of the first and second signals
Implementation Method 2
a first differential choke coupled between first and third wires of the transmission line for filtering out a differential mode noise of the first signal, and a second differential choke coupled between second and fourth wires of the transmission line for filtering out a differential mode noise of the second signal
Data Source
AI summary
A transmission line includes a signal terminal for inputting a first signal and a second signal, a first wire coupled to the signal terminal for transmitting the first signal, a second wire coupled to the signal terminal for transmitting the second signal, a filtering module coupled to the first and second wires for receiving the first and second signals to filter out noises of the first and second signal, a third wire coupled to the filtering module for transmitting the first signal, and a fourth wire coupled to the filtering module for transmitting the second signal.