Layered Magnetic Core for High-Frequency Micro Transformers
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Solution Overview
Problem
Existing electromagnetic devices, particularly transformers and power supplies, face challenges in downsizing due to heat generation and manufacturing difficulties with layered magnetic materials, leading to limited performance at high frequencies and thicker layers.
Innovation Solution
A layered magnetic material composed of electroplated Co—Ni—Fe alloy laminated with functionalized magnetic nanomaterials like magnetite or ferrite, enabling enhanced exchange coupling, magnetic saturation, and lower coercivity, along with a manufacturing process for micro fabricated components under mild plating conditions, allowing for unlimited layers and improved performance at MHz frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If thicker layers of magnetic material are used to increase inductance, then inductance increases, but eddy currents build up which disrupt magnetic fields, reduce inductance, and increase heat
Solution Approach 1:
The magnetic material is divided into multiple thin layers separated by insulating material. This segmentation prevents eddy currents from forming continuous loops through the thickness, as the insulating layers block current flow between magnetic layers. Each thin magnetic layer individually supports magnetic flux while the insulating barriers prevent harmful eddy currents, resolving the contradiction between needing sufficient inductance and minimizing energy loss.
Solution Approach 2:
The invention uses composite material structure combining magnetic material layers with insulating material layers. This composite approach allows the magnetic layers to provide the necessary magnetic properties (high permeability, saturation) while the insulating layers prevent eddy current formation. The composite structure enables operation at higher frequencies with reduced energy loss compared to solid thick magnetic layers.
2Adaptability or versatility
If more layers are added to increase device functionality, then device performance improves, but manufacturing difficulties involving cracking, porosity, and electrical shorting increase
Solution Approach 1:
By segmenting the magnetic material into thin layers separated by insulating material, the invention reduces internal stress and prevents cracking that would occur in thick single layers. The insulating layers act as stress relief barriers, allowing multiple layers to be stacked without compromising structural integrity. This enables addition of more layers for enhanced functionality while maintaining manufacturing quality.
Solution Approach 2:
The insulating material layers serve as intermediary elements between magnetic layers, preventing direct contact that would cause electrical shorting. These intermediary layers provide electrical isolation while allowing magnetic flux coupling between adjacent magnetic layers. This mediator approach enables stacking of multiple functional layers without the manufacturing defects of shorting, cracking, or porosity that plague thick single-layer structures.
3Volume of moving object
If device size is reduced for microprocessor applications, then integration density increases, but heat generation becomes more problematic
Solution Approach 1:
The segmented layered structure with insulating barriers reduces eddy current losses, thereby reducing heat generation in the miniaturized device. The thin magnetic layers separated by insulators prevent large-scale eddy current loops that would generate excessive heat in compact devices. This allows high-frequency operation in small volumes without thermal runaway.
Solution Approach 2:
The composite structure of magnetic and insulating layers provides both magnetic functionality and thermal management in the miniaturized device. The insulating layers reduce eddy current heating while the thin overall structure enables efficient heat dissipation to the substrate. This composite approach allows high-performance magnetic operation in compact volumes suitable for microprocessor applications.
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 provides a compact, tightly coupled coil and magnetic laminated core with superior magnetic properties, minimizing heat generation and inductance loss, enabling enhanced performance in micro fabricated electromagnetic devices without layer thickness limitations.
Implementation Method 1
A layered magnetic material having an unlimited number of layers of electroplated Co—Ni—Fe alloy laminated with functionalized magnetic nanomaterial such as magnetite or ferrite
Implementation Method 2
eddy currents which build up in thicker layers of material seriously disrupt the magnetic fields generated therein, reduce inductance and increase heat in the device
Data Source
AI summary
A micro fabricated electromagnetic device and method for fabricating its component structures, the device having a layered magnetic core of a potentially unlimited number of alternating insulating and magnetic layers depending upon application, physical property and performance characteristic requirements for the device. Methods for fabricating the high performing device permit cost effective, high production rates of the device and its component structures without any degradation in device performance resulting from component layering.