Electrical Assembly Shielding via Housing Indents
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Solution Overview
Problem
Conventional electromagnetic shielding solutions for electrical equipment in vehicles, such as power converters, are costly and inefficient due to the need for multiple specific shielding devices and mechanical fixing elements, which can lead to insufficient electrical connections and reduced electromagnetic compatibility.
Innovation Solution
The introduction of additional electrical connections through indents between the housing and cover of the electrical assembly, acting as a Faraday cage, reduces the size and resistance of current loops, enhancing electromagnetic shielding performance without increasing the number of mechanical fixing elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple specific shielding devices are added for each electrical component, then electromagnetic shielding performance is improved, but manufacturing cost and device complexity increase
Solution Approach 1:
The patent merges multiple individual shielding devices into a single integrated shielding structure formed by the housing and cover. Instead of adding separate shielding components for each electrical component, the enclosure itself is designed to provide comprehensive electromagnetic shielding, reducing the total number of parts while maintaining or improving shielding effectiveness.
Solution Approach 2:
The housing and cover serve dual functions: they provide mechanical protection for the electrical components and simultaneously act as electromagnetic shields. This multi-functional design eliminates the need for dedicated shielding devices, as the structural components perform both protective and electromagnetic containment roles.
2Reliability
If the number of mechanical fixing elements is increased to reduce current loop size, then electromagnetic shielding performance is improved, but manufacturing cost and assembly complexity increase
Solution Approach 1:
The patent changes the electrical contact resistance parameter at the interface between housing and cover by introducing indents. These indents create multiple intimate contact points that reduce contact resistance without requiring additional mechanical fixing elements, thereby maintaining low current loop resistance while simplifying the mechanical assembly.
Solution Approach 2:
The indents act as intermediary features that facilitate electrical contact between the housing and cover. Rather than relying solely on mechanical fixing elements to provide both mechanical attachment and electrical contact, the indents serve as intermediate contact points that ensure low-resistance electrical pathways while allowing fewer mechanical fasteners.
3Strength
If mechanical fixing elements are used to attach housing and cover, then structural integrity is maintained, but electrical connection quality may be insufficient due to surface roughness and deformation
Solution Approach 1:
The patent applies local quality enhancement by introducing indents at specific locations on the housing or cover surface. These indents create localized areas of improved contact quality without affecting the overall structural integrity provided by the mechanical fixing elements. The indents ensure high-quality electrical contact at critical points while the mechanical fasteners maintain global structural strength.
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 improves electromagnetic shielding efficiency, reduces manufacturing costs, and increases the compactness of electrical equipment by minimizing current loops and maintaining effective electromagnetic shielding, particularly at high frequencies.
Implementation Method 1
The housing 11 and the cover 12 are made of an electrically conductive material, in particular a metallic material such as an aluminum, the mechanical fixing elements 13 being adapted to realize an electrical connection between the housing 11 and the cover 12, so that to provide an electromagnetic shielding effect
Implementation Method 2
the emitted magnetic fields induce current (known as eddy current) loops, represented by a dashed line in Figure 1, circulating from the housing to the cover and back to the housing through the mechanical fixing elements. The current loops attenuate in return the emitted magnetic fields, providing an electromagnetic shielding effect.
Data Source
Figure 1~4
Figure 5~8
AI summary
The invention concerns an electrical assembly (1), configured to form an electromagnetic shield for an electrical equipment comprising electrical components, comprising a housing (11); a cover (12) closing said housing (11), mechanical fixing elements (13) configured to attach the cover (12) together with outer walls of the housing (11), at least one indent (14) arranged either on a face of the cover (12) facing the housing (11) or on an upper edge of the outer walls of the housing (11) facing the cover (12); the housing (11), the cover (12), and the mechanical fixing elements (13) being made of an electrically conductive material, the mechanical fixing elements (13) being adapted to realize an electrical connection between the housing (11) and the cover (12), the at least one indent (14) being configured to ensure an additional electrical connection between the cover (12) and the housing (11).