Multipart Magnetic Core Inductor Design for Power Converters
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Solution Overview
Problem
The design of electrical circuits using inductors often requires compromises due to the limitations of available components, hindering performance, particularly in power converters where inductance and current requirements are not adequately met by standard inductors.
Innovation Solution
The use of a multipart magnetic core comprising multiple magnetic core parts with different materials and geometries, such as ferrite and iron powder, allows for adjustable inductance profiles that meet specific inductance and current requirements, enabling better efficiency and transient response in electrical circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a single-material magnetic core is used, then the inductor structure is simple and manufacturing is easier, but the inductance profile cannot be optimized for both low-current efficiency and high-current transient response
Solution Approach 1:
The magnetic core is divided into multiple segments made of different magnetic materials (e.g., ferrite for high permeability and iron powder for high saturation current). Each segment contributes differently to the overall inductance characteristics, allowing the inductor to maintain high inductance at low currents while preventing saturation at high currents.
Solution Approach 2:
The patent combines different magnetic materials (ferrite and iron powder) within a single magnetic core structure. This composite approach leverages the high permeability of ferrite for low-current performance and the high saturation current density of iron powder for high-current performance, achieving a balanced inductance profile across the full current range.
2Quantity of substance
If ferrite material is used for high permeability, then inductance is high at low currents, but saturation occurs at low current levels
Solution Approach 1:
The ferrite magnetic core is segmented into multiple parts, with different segments having different geometries and materials. This segmentation allows the magnetic flux to be distributed across multiple paths, delaying saturation while maintaining high permeability benefits.
Solution Approach 2:
Different regions of the magnetic core use different materials optimized for specific functions: ferrite in regions where high permeability is needed for low-current operation, and iron powder in regions where high saturation current is needed for high-current operation.
3Object-generated harmful factors
If iron powder material is used for high saturation current, then current handling is improved, but permeability and inductance are reduced
Solution Approach 1:
The magnetic core is segmented such that iron powder is used in specific segments where high saturation current is required, while ferrite is used in other segments where high permeability is required. This segmentation allows both material advantages to be utilized simultaneously.
Solution Approach 2:
The patent creates a composite magnetic core structure combining ferrite and iron powder materials. The ferrite provides high permeability for low-current inductance, while the iron powder provides high saturation current density for high-current performance, achieving a balanced overall performance.
4Reliability
If custom inductance profiles are designed, then circuit performance is optimized, but component availability and selection are limited
Solution Approach 1:
The magnetic core is divided into multiple independently configurable segments. Each segment can be designed with different geometries, materials, and winding configurations, allowing custom inductance profiles to be created while maintaining manufacturing feasibility through modular assembly.
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 approach allows for inductors with customizable inductance profiles, providing high efficiency at low currents and improved transient response at high currents, enhancing the performance of electrical circuits like power converters.
Implementation Method 1
The magnetic core parts may be disposed adjacent and magnetically coupled together to form one or more channels through which the one or more of wires may wind
Implementation Method 2
The inductor provides an inductance of at least 40 nH for currents greater than 1 A and less than 60 A
Implementation Method 3
The first magnetic material having a steeper saturation slope and higher permeability than the second magnetic material
Implementation Method 4
The first magnetic material having a steeper saturation slope and higher permeability than the second magnetic material
Data Source
AI summary
An inductor has one or more wires and a multipart magnetic core. The multipart magnetic core has magnetic core parts that are adjacent and magnetically coupled. The inductor provides an inductance of at least 40 nH for currents greater than 1 A and less than 60 A, and at least 20 nH for currents of at least 60 A.