Planar Magnetic Module Overmolding for Compact Transformer Packaging
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Solution Overview
Problem
There is a need for smaller, more efficient, and cost-effective transformers that consume less power and operate with lower supply voltages, particularly in applications such as telecommunications, medical devices, and battery-operated wireless devices.
Innovation Solution
The development of magnetic-component modules that include a substrate with a header and a winding trace, overmolded with material to encapsulate the header, core, and trace, along with wire bonds connecting the header to the substrate, forming a compact and efficient transformer design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of stationary object
If traditional adjacent coil arrangement is used, then transformer performance is achieved, but component size is large
Solution Approach 1:
The patent transitions from traditional three-dimensional adjacent coil winding arrangement to a two-dimensional planar configuration where windings are formed as traces on a header mounted on a substrate. This dimensional change enables significant size reduction while maintaining electrical functionality through the planar layout of primary and secondary windings.
Solution Approach 2:
The patent merges the magnetic core, windings, and electrical connections into a single integrated module assembly. The header with traces is mounted directly on the substrate, and the entire assembly is encapsulated in overmold material, creating a compact unified structure that reduces overall component size while maintaining performance.
2Use of energy by moving object
If transformer size is reduced, then power consumption decreases, but manufacturing complexity increases
Solution Approach 1:
The substrate serves multiple functions: it provides mechanical support for the header, establishes electrical connections through surface-mount pads, and serves as a mounting platform for additional electrical components. The header simultaneously provides structural support and carries the winding traces, reducing the need for separate components and simplifying the overall assembly process.
Solution Approach 2:
The patent employs a nested structure where the header is mounted on the substrate, wire bonds connect the traces to substrate pads, and the entire assembly is encapsulated within overmold material. This nested arrangement consolidates multiple components into a compact hierarchical structure that reduces power consumption while managing manufacturing complexity through systematic integration.
3Strength
If overmolding is used to encapsulate components, then structural integrity is improved, but manufacturing steps increase
Solution Approach 1:
The header is mounted on the substrate and wire bonds are attached to connect traces to substrate pads before the overmolding process. This preliminary assembly ensures proper positioning and electrical connections are established prior to encapsulation, allowing the overmold to be applied as a final protective step that consolidates remaining manufacturing operations.
Solution Approach 2:
The overmolding process combines multiple functions into a single manufacturing step: it provides structural support, protects the header, core, and trace assembly from environmental factors, and secures wire bonds in place. This consolidation of protective and structural functions into one operation improves structural integrity while minimizing the number of separate manufacturing steps required.
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
This solution enables the creation of smaller, more efficient transformers with reduced power consumption, meeting the demands of modern applications while maintaining high performance and reliability.
Implementation Method 1
The primary winding(s) receive electrical energy, such as from a power source, and couples this energy to the secondary winding(s) by a changing magnetic field
Implementation Method 2
an overmold material encapsulating the header, the core, and the trace
Data Source
AI summary
A magnetic-component module includes a substrate, a header on the substrate, a core, a winding including a trace on the header, and an overmold material encapsulating the header, the core, and the trace.