Segmented Electrostatic Shield Layout for Stable Wireless Charging EMI
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Solution Overview
Problem
Conventional shields for wireless charging systems experience varying performance due to coupling variations between transmitter and receiver coils, leading to voltage imbalances that reduce EMI mitigation effectiveness.
Innovation Solution
A shield system comprising a pair of conductive segments separated by gaps, with the gaps of one shield aligning with the segments of the other, improving shielding across different coupling conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional solid shields are used for EMI mitigation, then shielding effectiveness is improved, but eddy current losses increase and shield performance varies with coupling conditions
Solution Approach 1:
The shield is divided into multiple conductive segments separated by gaps. This segmentation breaks the continuous conductive path that causes eddy currents, reducing energy losses while maintaining EMI shielding effectiveness. The gaps prevent large-scale eddy current loops from forming across the entire shield surface.
Solution Approach 2:
The shield structure transitions from a uniform solid design to a non-uniform segmented design with specific gap patterns. This local modification optimizes the shield's interaction with electromagnetic fields, allowing effective EMI mitigation while minimizing eddy current losses in specific regions where gaps are strategically placed.
2Object-affected harmful factors
If conventional solid shields are used, then EMI shielding is provided, but shield performance varies with coupling variations between coils
Solution Approach 1:
The segmented structure with gaps provides multiple independent conductive paths that can adapt to varying magnetic coupling conditions. When coupling varies, the segmented design maintains shielding effectiveness across different operating points, unlike solid shields whose performance degrades under varying conditions.
Solution Approach 2:
The gap dimensions and segment configurations are designed to maintain effective shielding across a range of coupling parameters. By carefully selecting gap sizes and segment arrangements, the shield adapts to different coupling conditions between transmitter and receiver coils, maintaining consistent performance.
3Loss of energy
If segmented shields with gaps are used, then eddy current losses are reduced, but shielding effectiveness may be compromised
Solution Approach 1:
The segmentation is designed with specific gap dimensions and segment arrangements that balance eddy current reduction with EMI shielding. The gaps are sized and positioned to break harmful eddy currents while maintaining sufficient conductive material to block electromagnetic interference.
Solution Approach 2:
The shield combines conductive segments with insulating gap materials to create a composite structure. This composite design achieves both objectives: the conductive segments provide EMI shielding while the insulating gaps prevent large eddy current loops, optimizing both energy efficiency and shielding effectiveness.
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 EMI mitigation by reducing eddy current losses and maintaining effective shielding performance regardless of coupling variations, while also saving space and materials.
Implementation Method 1
reducing eddy current losses
Data Source
AI summary
The described shielding system comprises a first shield and a second shield. The first shield comprises a first plurality of conductive segments extending from a first location. The first plurality of conductive segments are separated from each other by a first plurality of gaps. The second shield comprises a second plurality of conductive segments extending from a second location. The second plurality of conductive segments are separated from each other by a second plurality of gaps. An insulator may be interposed between the first shield and the second shield. The first plurality of gaps may at least partially align with the second plurality of conductive segments and the second plurality of gaps may at least partially align with the first plurality of conductive segments.