Circular Noise Filter Circuit for Stable Impedance Matching
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Solution Overview
Problem
Existing noise filters using composite electronic members fail to maintain constant impedance values across varying frequencies, leading to impedance mismatching with transmission lines, and suffer from inferior performance and cost issues due to the use of composite materials.
Innovation Solution
A noise filter design comprising conductive members, resistance members, and magnetic paths, with intermediate insulating members, forming a circular electric circuit to exchange electric charges and enhance impedance, using materials like copper, soft ferrite, and insulating materials to maintain symmetry and reduce leakage of high-frequency noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If composite electronic members are used to unify coil and capacitor, then the number of parts is reduced and structure is simplified, but the impedance characteristic becomes non-constant and varies with frequency
Solution Approach 1:
The patent divides the composite electronic member into separate coil and capacitor components, each with independent impedance characteristics. This segmentation allows the impedance of each component to be optimized independently, ensuring that the overall impedance remains constant across frequencies while maintaining reduced part count through integrated mounting structures.
2Reliability
If distances among parts are shortened to secure high-frequency characteristics, then noise filter performance at high frequencies is improved, but the size of the noise filter is reduced which conflicts with high-current use requirements
Solution Approach 1:
The patent arranges the coil and capacitor in a three-dimensional configuration where the capacitor is positioned above the coil with vertical spacing. This dimensional arrangement allows the parts to be spaced far enough apart to maintain constant impedance characteristics while still keeping the overall footprint compact, thus accommodating both high-frequency performance and high-current application requirements.
3Device complexity
If composite materials are used to unify magnetic and dielectric substances, then structure simplification is achieved, but the characteristics become inferior and availability and price-vs-performance are adversely affected
Solution Approach 1:
The patent introduces a magnetic shield as an intermediary component between the coil and capacitor. This magnetic shield serves multiple functions: it provides magnetic flux containment, enables precise spacing control between the coil and capacitor, and maintains the constant impedance characteristic. By using this intermediary rather than composite materials, the patent achieves structure simplification while preserving superior electrical characteristics and using readily available materials.
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 design ensures consistent impedance matching across frequencies, reduces high-frequency noise leakage, and enhances resistance components, improving noise filter performance and efficiency.
Implementation Method 1
a magnetic path comprising a first magnetic path formed in a region between the third conductive member and the fourth conductive member
Implementation Method 2
a first intermediate member between the first conductive member and the third conductive member
Implementation Method 3
a CR circuit (12) can consume the reflection noise through the conversion into thermal energy with the resistance component of a resistor (R2)
Data Source
AI summary
A noise filter includes: a first conductive member and a second conductive member that constitute a transmission line; a third conductive member that is disposed with a first intermediate member between the first conductive member and the third conductive member; a fourth conductive member that is disposed with a second intermediate member between the second conductive member and the fourth conductive member; a first resistance member and a second resistance member that electrically join the third conductive member and the fourth conductive member; and a first magnetic path that is formed in a region between the third conductive member and the fourth conductive member. One or both of the first intermediate member and the second intermediate member is an insulator. The third conductive member, the first resistance member, the fourth conductive member, the second resistance member and the third conductive member are circularly joined to form an electric circuit.