Dust Core Composition for High-Current Inductor Stability
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Solution Overview
Problem
Inductors used in electronic devices, such as personal computers, face challenges in maintaining high inductance when large currents are applied, requiring improved direct current superimposition characteristics.
Innovation Solution
A dust core composed of magnetic powder particles bound together by a binder layer, with specific magnetic permeability ratios and materials like amorphous metal glass or nanocrystalline powders, is used to enhance direct current superimposition characteristics, achieving high filling rates and low iron loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional magnetic materials are used in inductors, then manufacturing is easier and cost is lower, but direct current superimposition characteristics deteriorate (magnetic permeability drops significantly when large current is applied)
Solution Approach 1:
The patent uses amorphous metal glass powder or nanocrystalline powder as magnetic powder particles, which are composite materials with superior magnetic properties. These composite materials maintain high magnetic permeability even under large current conditions, achieving a ratio of μ(B=0.5T)/μ(B=0T) of 0.65 or higher, thus resolving the contradiction between reliability and ease of manufacture.
Solution Approach 2:
The patent changes the material parameters by selecting specific magnetic powder with controlled particle sizes (amorphous metal glass powder with 5-20 μm median diameter or nanocrystalline powder with 1-10 μm median diameter) and optimizing the binder layer composition. These parameter changes enable the dust core to maintain high inductance under large current while remaining manufacturable through conventional dust core fabrication processes.
2Reliability
If magnetic powder with high saturation flux density is used, then inductance is improved, but iron loss increases
Solution Approach 1:
The patent applies local quality by using amorphous metal glass powder or nanocrystalline powder with specific local microstructures that provide both high saturation flux density (1.3 T or higher) and low iron loss. The unique atomic structure of these materials at the local level enables simultaneous achievement of high inductance and low energy loss, resolving the contradiction between these two parameters.
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 inductors with excellent direct current superimposition characteristics and low iron loss, ensuring high inductance even under large current conditions, thereby meeting the demands of modern electronic devices.
Implementation Method 1
magnetic powder particles that are bound together through a binder layer
Implementation Method 2
a magnetic permeability in a state where a magnetic flux density generated by a direct current is 0 T and a magnetic permeability in a state where the magnetic flux density generated by a direct current is 0.5 T
Data Source
AI summary
To provide a dust core with good direct current superimposition characteristics and an inductor using such a dust core. A dust core according to an aspect of the present disclosure includes magnetic powder particles that are bound together through a binder layer, in which when a magnetic permeability in a state where a magnetic flux density generated by a direct current is 0 T is represented by μB=0 T and a magnetic permeability in a state where the magnetic flux density generated by a direct current is 0.5 T is represented by μB=0.5 T, a value expressed by μB=0.5 T/μB=0 T is 0.65 or higher.