Noise Filter With Nested Magnetic Member
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Solution Overview
Problem
The existing noise filters face a reduction in inductance and noise removal performance due to magnetic flux leakage from the inductor layer, and adding a magnetic body to cover the inductor layer complicates the structure.
Innovation Solution
A noise filter design that includes a coil, capacitor, magnetic member, and holding member, where the magnetic member is positioned within the holding member to surround the coil, forming a closed magnetic circuit and preventing flux leakage, while maintaining a simple configuration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the inductor layer is arranged on the outside of the housing, then the structure is simple, but the magnetic flux leaks to the outside causing reduced inductance and deteriorated noise removal performance
Solution Approach 1:
The magnetic member is nested inside the housing together with the coil, forming a closed magnetic circuit that contains the magnetic flux within the housing. This nested configuration prevents magnetic flux leakage to the outside while maintaining structural simplicity, resolving the contradiction between simple structure and effective noise removal performance.
2Reliability
If a magnetic body is added to cover the inductor layer to increase inductance, then the inductance increases, but the structure becomes complex
Solution Approach 1:
The magnetic member is merged with the housing structure, where the housing serves as both the enclosure and the magnetic circuit component. This integration eliminates the need for separate external magnetic shielding components, increasing inductance through the closed magnetic circuit while avoiding additional structural complexity.
3Reliability
If the magnetic member is positioned with respect to the coil using a holding member, then the magnetic flux leakage is prevented, but the device complexity increases
Solution Approach 1:
The holding member serves multiple functions: it positions the magnetic member relative to the coil, provides structural support within the housing, and maintains the closed magnetic circuit configuration. This multi-functionality prevents magnetic flux leakage while minimizing the addition of separate components, thus avoiding excessive device 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
Enhances noise removal performance by reducing inductance loss and maintaining a straightforward structure without adding external components, thus improving the filter's effectiveness.
Implementation Method 1
a magnetic flux generated from the coil can be kept from leaking
Implementation Method 2
the magnetic member is positioned with respect to the coil... forming a closed magnetic circuit
Implementation Method 3
the coil and the capacitor are connected to the conducting wire... noise generated in the conducting wire can be removed
Data Source
AI summary
Provided is a noise filter that can enhance noise removal performance with a simple configuration. A noise filter (10) includes a connector (20) that houses a terminal fitting (22) connected to an input/output wire (WH) in a state in which the input/output wire (WH) is lead out from the connector (20). The noise filter (10) includes a coil (40) that is connected to the input/output wire (WH), a capacitor (30) that is electrically connected to the coil (40), and a magnetic member (50). The noise filter (10) includes a case (60) that houses the capacitor (30), the coil (40), and the magnetic member (50), and a holding member (70) that holds the magnetic member (50) in a state in which the magnetic member (50) is positioned with respect to the coil (40).