Porous SiO2 Insulation Layer Sealing for Eddy Current Reduction
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Solution Overview
Problem
Existing methods for creating thin insulation layers in magnetic devices are costly due to the need for expensive precision deposition equipment and result in porous layers that are poor insulators, limiting their effectiveness in reducing eddy currents and current flow perpendicular to the layering.
Innovation Solution
A method involving the deposition of a porous SiO2 layer using CCVD or AP-PECVD, followed by the application of a metallic ink that forms a layer covering the voids of the SiO2 layer, creating a gapped porous insulation layer with increased insulative strength without using expensive polymers or high-temperature processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If thin insulation layers are deposited using precision deposition equipment, then insulation quality improves, but manufacturing cost increases significantly
Solution Approach 1:
The patent uses disposable photoresist masks and simple plating equipment instead of expensive precision deposition equipment. The insulation pattern is created through low-cost photolithography and electroplating processes, eliminating the need for costly vacuum deposition systems while achieving sufficient insulation quality for the application.
Solution Approach 2:
The patent changes the approach from depositing thin insulation layers to creating thicker insulation patterns through controlled electroplating. By adjusting plating parameters (current density, time, bath composition) and using photoresist thickness control, the method achieves adequate insulation without requiring atomic-level deposition precision.
2Volume of moving object
If frequency of operation is increased to reduce size of magnetic components, then device size decreases, but eddy current losses increase
Solution Approach 1:
The patent segments the magnetic core into multiple layers separated by insulation patterns. This layering approach reduces eddy current paths within each layer while maintaining the overall magnetic functionality. The segmentation allows higher operating frequencies by limiting the circulation of eddy currents to smaller regions within individual layers.
Solution Approach 2:
The patent introduces insulation layers as intermediary elements between magnetic layers. These insulation patterns act as barriers that interrupt eddy current paths while allowing magnetic flux to pass through. The intermediaries enable higher frequency operation by reducing energy losses without significantly increasing component volume.
3Ease of manufacture
If porous SiO2 insulation layers are used to reduce cost, then manufacturing cost decreases, but insulative strength is insufficient
Solution Approach 1:
The patent creates a composite structure combining porous SiO2 layers with metal insulation patterns formed by electroplating through photoresist masks. The composite approach leverages the low-cost advantage of porous SiO2 deposition while adding conductive metal patterns that provide enhanced insulation barriers, achieving both cost reduction and improved insulative strength.
Solution Approach 2:
The patent applies local quality enhancement by creating concentrated insulation patterns at critical locations using photoresist masking. Instead of requiring uniform high-quality insulation throughout, the method places enhanced insulation only where needed to block eddy currents, maintaining overall cost-effectiveness while providing sufficient insulative strength at key interfaces.
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 method achieves increased insulative strength and reduced eddy current formation, providing a greater skin depth for materials integrated with the porous SiO2 layer, while maintaining low costs and compatibility with semiconductor packaging and printed circuit boards.
Implementation Method 1
depositing a porous insulation layer in a CCVD or AP-PECVD style
Implementation Method 2
Chemical Combustion Vapor Deposition (CCVD)
Implementation Method 3
The spheres are heated, which at least partially melts the spheres connecting them and forming a layer
Implementation Method 4
the spheres cover the porous SiO2 layer. Given the shape of the spheres, there are voids between the spheres of the SiO2 and the spheres of the metal ink. These voids are above and beyond the voids which form directly from voids of the SiO2 layer.
Data Source
AI summary
The present invention presents a method for reducing Hysteresis core loss and Eddy current core loss for magnetic components or materials integrating a porous insulation layer and the resulting apparatus. A metallic layer is formed, and a porous insulation layer is deposited. The insulation deposition is followed by the formation of an ink coverage layer which seals the voids of the porous insulation layer so that they become gaps. The ink coverage layer may be built upon to form subsequent component layers. The result is a component with a gapped porous insulation layer where the voids increase the insulation the porous insulation layer provides. This increases the directional impedance of the magnetic material or core while retaining the thinness of the layers, both insulation and metallic, that the use of porous insulation layers allows.