Nonlinear Inductor Core Structure for Stepped Saturation
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Solution Overview
Problem
Existing nonlinear inductors face challenges in maintaining high inductance under light loads while avoiding sharp drops in inductance under heavy loads, leading to issues with saturation current and temperature rise, which affects their performance and reliability.
Innovation Solution
The nonlinear inductor design incorporates magnetic core assemblies with non-uniform air gaps and/or different materials, along with a magnetic plastic encapsulation layer, to achieve stepped saturation characteristics, optimizing initial inductance and saturation characteristics by preferentially saturating materials with different magnetic properties as current increases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If more coil turns are used to increase inductance value under light load, then inductance increases, but wire diameter decreases, resistance increases, and saturation current decreases
Solution Approach 1:
The magnetic core is divided into multiple magnetic core assemblies with different air gap sizes. This segmentation allows different portions of the magnetic path to saturate at different current levels, creating a stepped saturation characteristic that maintains inductance over a wider current range without increasing coil turns.
Solution Approach 2:
Different magnetic core assemblies have different local magnetic properties through varying air gap sizes. The air gap-free or small air gap assemblies provide high permeability for light load conditions, while large air gap assemblies provide saturation resistance for heavy load conditions, optimizing both inductance and saturation current characteristics.
2Volume of moving object
If larger inductance is achieved under light load conditions, then inductance increases, but temperature rise current decreases
Solution Approach 1:
The magnetic path is segmented into multiple assemblies with different saturation characteristics. This allows the inductor to utilize different magnetic paths at different current levels, reducing core losses and improving temperature rise characteristics while maintaining high inductance at light loads.
3Ease of manufacture
If uniform air gap is used in magnetic core, then manufacturing is simple, but stepped saturation characteristics cannot be achieved
Solution Approach 1:
Instead of creating a non-uniform air gap in a single magnetic core, the design segments the magnetic path into multiple separate magnetic core assemblies, each with its own uniform air gap. This approach achieves the required stepped saturation characteristics while maintaining manufacturing simplicity, as each assembly can be manufactured independently with standard uniform air gaps.
4Reliability
If magnetic core assemblies with different materials are used, then stepped saturation characteristics are achieved, but device complexity increases
Solution Approach 1:
The patent applies local quality by varying air gap sizes in different magnetic core assemblies rather than using different materials. This achieves stepped saturation characteristics through geometric variation alone, avoiding the complexity of multi-material manufacturing while maintaining the desired magnetic properties.
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 design enhances the inductor's ability to maintain higher initial inductance and larger saturation current, reducing resistance and improving temperature rise characteristics compared to traditional inductors, while maintaining consistent performance across varying load conditions.
Implementation Method 1
the nonlinear inductor has stepped saturation characteristics
Implementation Method 2
the magnetic core assemblies and the magnetic plastic encapsulation layer are made of different materials
Implementation Method 3
the conductor is arranged on the two central columns
Data Source
AI summary
Disclosed is a nonlinear inductor, a manufacturing method thereof, and a nonlinear inductor row. The nonlinear inductor includes two magnetic core assemblies, a conductor and a magnetic plastic encapsulation layer; the magnetic core assemblies include magnetic cores; each magnetic core includes a flange and a central column arranged on the flange; two central columns of the two magnetic core assemblies are opposite to each other; a non-uniform air gap exists between the two central columns and/or the magnetic core assemblies are made of different materials; the conductor is arranged on the two central columns; the two magnetic core assemblies and the conductor are located in the magnetic plastic encapsulation layer; electrode parts of the conductor are exposed outside the magnetic plastic encapsulation layer; and the magnetic core assemblies and the magnetic plastic encapsulation layer are made of different materials; thereby the nonlinear inductor has stepped saturation characteristics.