Wiring Core Structure for Parasitic Inductance Suppression
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Solution Overview
Problem
In large current and high frequency circuits, parasitic inductance in wiring remains a significant issue despite conventional methods like shortening wires or using twisted or parallel configurations, as these methods do not adequately cancel magnetic flux, leading to insufficient suppression of parasitic inductance.
Innovation Solution
A wiring core structure featuring a tubular-shaped core made of soft magnetic material with a wound wire, where the core is divided into multiple sections with varying diameters and shapes to create a superposition structure that utilizes the transformer principle to cancel magnetic flux by short-circuiting the wound wire, effectively reducing parasitic inductance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional methods like shortening wires or using twisted/parallel configurations are used, then wiring length is reduced or magnetic flux cancellation is attempted, but parasitic inductance suppression is insufficient
Solution Approach 1:
The core is divided into multiple divided cores with different shapes and sizes, each segment contributing to magnetic flux cancellation. The divided cores are arranged in a stacked configuration, creating multiple zones for flux management along the wire length.
Solution Approach 2:
Different divided cores have different shapes and sizes tailored to local magnetic flux distribution requirements. Each divided core is positioned and dimensioned to optimally cancel magnetic flux in its specific region, creating non-uniform local properties along the wire.
2Object-affected harmful factors
If a single solid core is used, then magnetic flux cancellation is attempted, but adaptability to different wire configurations is limited
Solution Approach 1:
The core is segmented into multiple divided cores that can be independently configured. This segmentation allows the structure to adapt to different wire diameters, positions, and routing configurations while maintaining effective magnetic flux cancellation across various应用场景.
Solution Approach 2:
The divided cores intentionally have different shapes and sizes rather than being uniform. This asymmetric design provides configurational flexibility to match different wire geometries and routing requirements, enhancing adaptability to various wiring scenarios.
3Object-affected harmful factors
If divided cores with different shapes and sizes are stacked, then magnetic flux cancellation efficiency is improved, but structural complexity increases
Solution Approach 1:
While segmentation into divided cores increases functional capability for flux cancellation, the segments are designed with simple geometric forms that can be manufactured using standard processes, balancing complexity with manufacturability.
Solution Approach 2:
Multiple divided cores are stacked and combined into a single integrated structure that functions as one unified magnetic flux cancellation device. This merging approach consolidates multiple functional elements into a compact assembly, reducing overall structural complexity.
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 configuration significantly reduces parasitic inductance by efficiently canceling magnetic flux around the main wire, providing a more effective solution than traditional methods by leveraging the transformer principle to minimize magnetic flux generation.
Implementation Method 1
The wiring core structure produces an inductance suppression effect for reducing a parasitic inductance of a main wire by utilizing the principle of a transformer in which a main wire is set to be a primary cable and a wound wire is set to be a secondary cable
Implementation Method 2
The core portion includes a wiring hole for passage of a main wire to be a parasitic-inductance suppression target and has a body portion made of a soft magnetic material
Data Source
AI summary
A wound wire is wound around a core assembly so that both ends are short-circuited. In a coupling pin insertion state in which a coupling pin is inserted in a through hole of the core assembly, outer-peripheral space parts of respective divided core portions of the core assembly are disposed so as to overlap in plan view. Consequently, an air gap is formed in a part of a side surface of the core assembly. Before formation of a covering member, a main wire is caused to pass through the air gap and is thus disposed in a wiring hole of the core assembly. Then, the covering member for closing the air gap is provided on an outer peripheral surface side of the core assembly including the air gap so that a core structure is obtained.