Multilayer Coil Layout With Parallel Windings for Lower Resistance
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Solution Overview
Problem
Existing multilayer coil components suffer from high electrical resistivity and low quality factor (Q) values, leading to increased heat loss and reduced withstand voltage.
Innovation Solution
A multilayer coil component design featuring two coils connected in parallel, with a high-resistance layer or portion between them, and aligned winding directions to reduce electrical resistivity and improve magnetic flux alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If one coil is disposed in the element body, then the device complexity is reduced, but the electrical resistivity increases and quality factor decreases
Solution Approach 1:
The single coil is segmented into two separate coils (first coil and second coil) disposed at different locations within the element body. Each coil is connected to external electrodes, creating parallel current paths that reduce overall electrical resistivity and improve energy efficiency.
Solution Approach 2:
The patent transitions from a single-coil configuration to a multi-coil spatial arrangement within the element body. By distributing coils in different dimensions and locations, the invention creates multiple current flow paths, effectively reducing electrical resistivity without significantly increasing overall device complexity.
2Reliability
If the element body is formed of ferrite material, then the manufacturing is simplified, but the direct current superimposition characteristics deteriorate
Solution Approach 1:
The patent changes the material parameter of the element body from ferrite to a soft magnetic alloy material. This parameter change improves direct current superimposition characteristics while maintaining manufacturability through established ceramic or composite manufacturing processes.
3Reliability
If the electrical resistivity between coil layers is increased, then the withstand voltage is improved, but the heat loss increases
Solution Approach 1:
The patent introduces a high-resistivity layer as an intermediary between the first and second coils. This intermediary layer increases withstand voltage by preventing electrical breakdown between coils while the parallel coil configuration compensates for any heat loss by providing alternative current paths.
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 design reduces direct current resistance, enhances quality factor (Q) values, and increases withstand voltage while minimizing heat loss and magnetic saturation.
Implementation Method 1
a first coil disposed in the element body and configured to include a plurality of first coil conductors; a second coil disposed in the element body and configured to include a plurality of second coil conductors
Implementation Method 2
One end portion of each of the first coil and the second coil is connected to the first external electrode, and the other end portion of each of the first coil and the second coil is connected to the second external electrode. As a result, the multilayer coil component has a configuration in which the first coil and the second coil are connected in parallel
Data Source
AI summary
A multilayer coil component includes: an element body formed by stacking a magnetic body layer containing a plurality of metal magnetic particles of a soft magnetic material; a first coil disposed in the element body and configured to include a plurality of first coil conductors; a second coil disposed in the element body and configured to include a plurality of second coil conductors; a first external electrode to which one end portion of each of the first coil and the second coil is connected; and a second external electrode to which the other end portion of each of the first coil and the second coil is connected.