Magnetic Bead Inductor Pin Structure for Low-Frequency EMI Impedance
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Solution Overview
Problem
Current EMI magnetic bead inductors face challenges in achieving high impedance in low frequency bands, particularly in the range of dozens of megahertz, due to assembly gaps and structural limitations that compromise electromagnetic interference suppression performance.
Innovation Solution
The design incorporates a magnetic core with a metal pin group featuring inserting and connecting portions, allowing for increased winding length and direct insertion into the core without a split structure, enhancing the anti-interference performance by utilizing the core's magnetism effectively and eliminating assembly gaps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a multi-turn coil is mounted in a magnetic core with a split structure to increase impedance, then the impedance increases, but assembly gaps between the split magnets reduce the electromagnetic interference suppression performance
Solution Approach 1:
The magnetic core is divided into multiple segments (first magnetic core segment and second magnetic core segment) that are assembled together. This segmentation allows for multi-turn coil winding while maintaining the ability to assemble the core in parts, but the segments are designed to minimize assembly gaps to preserve EMI suppression performance.
Solution Approach 2:
The patent applies different structural qualities to different parts of the magnetic core. The first and second magnetic core segments have specific geometric features (such as tapered surfaces or complementary shapes) that ensure tight mating when assembled, creating a high-quality magnetic path at the interface while allowing multi-turn coil integration.
2Ease of manufacture
If a single-turn design is used to reduce cost and simplify assembly, then assembly is easier and cost is reduced, but the impedance in the frequency band of dozens of megahertz is insufficient
Solution Approach 1:
The patent provides flexibility in the number of turns (first turn or more) and configuration of the coil, allowing the design to adapt to different impedance requirements while maintaining the simple insertion assembly process. The magnetic core segments are designed to accommodate various coil configurations without requiring complex assembly procedures.
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 increases impedance in the frequency band of dozens of megahertz, improving the EMI magnetic bead inductor's performance by up to 100Ω to 300Ω, as demonstrated in performance graphs, while simplifying assembly and maximizing core utilization.
Implementation Method 1
The EMI magnetic bead inductor is formed by winding a coil on a magnetizer
Implementation Method 2
Second ends of the two first inserting portions are inserted into two said insertion holes from first ends of the two said insertion holes and protrude from second ends of the two said insertion holes
Data Source
AI summary
An EMI magnetic bead inductor comprises a magnetic core and at least one metal pin group. The metal pin group includes at least one first metal pin. The first metal pin has two first inserting portions and one first connecting portion. First ends of the two first inserting portions are connected by the first connecting portion. The magnetic core is provided with a plurality of insertion holes. Second ends of the two first inserting portions are inserted into two said insertion holes from first ends of the two said insertion holes and protrude from second ends of the two said insertion holes.