Terminal Noise Shielding Wall for Compact Electronic Enclosures
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Solution Overview
Problem
Existing electrical and electronic apparatuses face challenges in reducing electromagnetic noise leakage without requiring a large shielding case that encloses the entire filter circuit, which necessitates significant space.
Innovation Solution
The apparatus incorporates a conductor case, a terminal, a conductor wire connected to the internal circuit, a capacitor, a case connection portion, and a wall positioned in a specific configuration to reduce electromagnetic noise leakage without the need for a large shielding case, where the wall is not in contact with the conductor wire and is placed to minimize the interlinkage area with the noise magnetic field.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a shielding case is used to enclose the whole filter circuit, then electromagnetic noise leakage is reduced, but the device size and space requirements increase
Solution Approach 1:
The invention divides the filtering function into two parts: an external filter circuit outside the case and an internal filter structure inside the case. The external filter handles common-mode noise, while the internal structure (conductive sheet on case inner surface) handles differential-mode noise, eliminating the need for a large enclosing shielding case
Solution Approach 2:
The invention extracts the main filtering components (capacitors and inductors) from inside the case and places them in an external filter circuit. Only essential components remain inside, minimizing the space needed for internal shielding while maintaining noise reduction effectiveness
2Object-affected harmful factors
If a large shielding case is used to enclose the filter circuit, then induced voltage from noise magnetic fields is reduced, but the placement space increases
Solution Approach 1:
The invention applies local shielding only where needed - a conductive sheet is placed on the inner surface of the case specifically at the filter circuit location, rather than enclosing the entire device. This localized approach reduces induced voltage at the critical area without increasing overall case size
Solution Approach 2:
The invention addresses the shielding problem by adding a dimensional element - a conductive sheet layer on the case inner surface - rather than expanding the case volume. This creates a shielding barrier in a different dimensional approach that doesn't increase placement space
3Object-affected harmful factors
If the filter circuit is enclosed in a shielding case, then noise current flow is controlled, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The invention merges the shielding function with the case structure itself by placing a conductive sheet on the inner surface of the case. This integrates the shielding function into the existing case rather than adding a separate enclosing structure, reducing overall device complexity
Solution Approach 2:
The case structure serves multiple functions: it provides mechanical enclosure, mounting surface, and electromagnetic shielding through the conductive sheet. The external filter circuit also serves dual purposes of filtering and structural organization, reducing the need for additional dedicated shielding components
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
This configuration effectively reduces electromagnetic noise leakage from the terminal while minimizing the required space, achieving noise reduction comparable to a full shielding case without the need for extensive enclosure.
Implementation Method 1
a capacitor whose one end is connected to the conductor wire and whose other end is connected to the metal case. The capacitor acts in such a way as to make it easy for the noise current superimposed onto the conductor wire to flow through the metal case.
Implementation Method 2
when a noise magnetic field which is a magnetic field caused by the noise generated from the internal circuit interlinks with space enclosed by the conductor wire and the metal case, an induced current flows through loop-shaped path according to the law of electromagnetic induction, and an induced voltage is generated between the metal case and the terminal.
Implementation Method 3
a wall whose peripheral part is connected to the case, the wall being positioned in space enclosed by the case, the at least one conductor wire, and the case connection portion. The wall is placed in such a way that a side opposite to another side connected to the wall, out of sides which the case has, extends along the at least one conductor wire.
Data Source
AI summary
Disclosed is electrical and electronic apparatus that is configured in such a way as to include: a case which is a conductor; a terminal mounted to the case; a conductor wire whose one end is connected to the terminal and whose other end is connected to a circuit accommodated in the case; a capacitor whose one end is connected to the conductor wire; a case connection portion whose one end is connected to the other end of the capacitor and whose other end is connected to the case; and a wall whose peripheral part is in space enclosed by the case, the conductor wire, and the case connection portion, and is connected to the case in a state in which the wall is not in contact with the conductor wire.