Cable Connection Mesh Shielding for Power Converter EMI
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Solution Overview
Problem
Existing cable shielding solutions fail to provide effective electromagnetic compatibility (EMC/EMI) shielding at the connection portion of cables connected to power converters, such as frequency converters, inverters, or rectifiers, as the screen shield is often stripped away, exposing the connection portion to potential interferences.
Innovation Solution
A method and shielding arrangement using an electrically conductive mesh member arranged around and along the connection portion of a cable, forming a mesh tube, and clamped at specific positions to connect to a frame or bracket, providing 360-degree shielding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the screen shield is stripped away from the connection portion of the cable, then the connection portion becomes accessible for connection to the power converter, but the shielding effectiveness is reduced and the connection portion becomes exposed to electromagnetic interferences
Solution Approach 1:
The shielding solution is divided into two distinct segments: the original cable screen shield that remains on the cable, and a separate additional shield component that is applied specifically to the connection portion. This segmentation allows the connection portion to be accessible for electrical connection while simultaneously providing electromagnetic shielding, resolving the contradiction between accessibility and shielding effectiveness.
Solution Approach 2:
The shielding approach transitions from a one-dimensional cylindrical screen shield surrounding the cable to a two-dimensional additional shield component that wraps around or attaches to the connection portion. This dimensional change enables the shield to cover the exposed connection area effectively while maintaining accessibility for electrical connections.
2Object-affected harmful factors
If traditional shielding solutions are implemented at power converters, then electromagnetic shielding is provided, but the implementation complexity and cost increase
Solution Approach 1:
The additional shield component is designed as a simple, inexpensive, and easily replaceable element that can be quickly applied to the connection portion. This approach replaces complex traditional shielding implementations with a straightforward component that achieves effective electromagnetic shielding without increasing device complexity or implementation cost.
Solution Approach 2:
The additional shield component is designed to be self-contained and self-installing, requiring minimal external assistance or complex installation procedures. The component can be independently applied to the connection portion by standard personnel using simple tools, thereby reducing implementation complexity and eliminating the need for specialized shielding installation procedures.
3Manufacturing precision
If a fixed shielding solution is designed for specific cable diameters, then manufacturing precision is improved, but adaptability to different cable diameters is reduced
Solution Approach 1:
The additional shield component incorporates dynamic adjustment capabilities through features such as adjustable clamps, flexible mounting mechanisms, or expandable structures. This allows the shield to adapt its dimensions to match different cable diameters while maintaining precise fit and effective shielding, thereby simultaneously achieving manufacturing precision and cable diameter versatility.
Solution Approach 2:
The additional shield component is designed as a universal solution that can be applied to connection portions of cables with various diameters. Through standardized mounting interfaces and adjustable features, a single shield design serves multiple cable sizes, eliminating the need for multiple specialized shield components and achieving both precision and adaptability.
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 shields the connection portion of the cable from electromagnetic interferences, providing a cost-effective and easily implementable solution for both new installations and upgrades, with the added benefit of being adaptable to a wide range of cable diameters.
Implementation Method 1
arranging the electrically conductive mesh member around and along the connection portion and a cable gland on the cable, thereby forming a mesh tube around the connection portion and the cable gland
Data Source
AI summary
A method and a shielding arrangement (100) for shielding a connection portion of a cable (10) at a power converter (200) includes a frame or bracket (19). The method includes obtaining (310) an electrically conductive mesh member (12), arranging (320) the electrically conductive mesh member (12) around and along the connection portion and a cable gland (13) on the cable, thereby forming a mesh tube around the connection portion and the cable gland (13), and clamping (330) the electrically conductive mesh member (12) at a first position along the connection portion between a first clamp (14) and the cable (10), and at a second position along the connection portion between a second clamp (20) and a cable gland (13), wherein the electrically conductive mesh member (12) is connected to the frame or bracket (19) via at least one of the first clamp (14) and the second clamp (20). A power converter (200) is also disclosed.