Molded Inductor Core Channels for Void-Free Magnetic Fill
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Solution Overview
Problem
Molded inductors face issues with high cost and large size due to limited discrete magnetic options, voids in magnetic mold material, and pressure mismatch during molding, which can cause magnetic core lifting and fill issues.
Innovation Solution
Incorporating a magnetic core with mold flow enhancing features that provide paths for magnetic mold material to flow, ensuring even distribution and avoiding voids without compromising mechanical integrity or increasing size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If discrete magnetic options are used in power supply modules, then magnetic performance can be achieved, but cost and size increase
Solution Approach 1:
The patent combines the magnetic core and mold material into a single integrated component, eliminating the need for separate discrete magnetic parts. The magnetic core is fully encapsulated by the magnetic mold material, creating a unified structure that reduces component count, assembly complexity, and overall size while maintaining magnetic performance.
2Strength
If magnetic core includes a flange over body region, then mechanical support is improved, but voids form in magnetic mold material
Solution Approach 1:
The patent segments the mold cavity into multiple regions by introducing flow enhancement features (channels, grooves, or recesses) on the flange surface. These features divide the mold material flow path into multiple streams, allowing mold material to reach tight areas around the magnetic core more effectively and reducing void formation while preserving the flange's mechanical support function.
3Productivity
If pressure builds up beneath magnetic core during molding, then mold material flow is driven, but magnetic core lifting occurs
Solution Approach 1:
The patent applies local quality by creating specific surface features (channels, grooves, or recesses) only in certain areas of the flange. These localized features allow mold material to flow through or around them, equalizing pressure distribution beneath the magnetic core and preventing lifting in critical areas while maintaining overall structural integrity.
4Manufacturing precision
If mold flow enhancement features are added to magnetic core, then mold fill consistency improves, but mechanical integrity may be compromised
Solution Approach 1:
The patent utilizes the flange surface itself as a flow enhancement structure, creating channels, grooves, or recesses that guide mold material flow without requiring additional porous inserts or weak structural elements. These features are integrated into the flange geometry, maintaining mechanical strength while improving mold fill consistency through controlled flow paths.
Data Source
AI summary
A molded inductor includes a winding having leads configured for attaching leads of the winding to pads on a package substrate, having a magnetic core with a body disposed within the winding, wherein the magnetic core has at least one mold flow enhancing feature that enhances a filling of a magnetic mold material as compared to a filling provided by a uniform cylindrical body. The magnetic mold material encases the winding and the magnetic core to form either a standalone discrete inductor component, or the magnetic component of an output filter of an integrated switching power converter module.