Integrated Magnetic Core for Surge Protection and EMI Filtering
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Solution Overview
Problem
Conventional surge protection devices (SPDs) and electromagnetic interference (EMI)/electromagnetic compatibility (EMC) filters require separate components, leading to increased space occupation, weight, and manufacturing costs due to the need for two distinct magnetic components: decoupling inductors and common mode chokes, which also suffer from cold soldering issues and low power density.
Innovation Solution
An integrated magnetic device that combines the functions of SPD and EMC filtering using a single magnetic core structure with strategically placed windings and an air gap, allowing for shared magnetic flux and reduced core material usage, thereby achieving high common mode and leakage inductance while minimizing space and weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate decoupling inductor and common mode choke components are used, then each component can perform its specific function, but the overall device occupies more space and has higher weight
Solution Approach 1:
The patent combines the decoupling inductor and common mode choke into a single integrated magnetic device with one magnetic core. The magnetic core includes a first magnetic core column with a first winding (decoupling inductor) and a second magnetic core column with a second winding (common mode choke). This merging of two separate components into one integrated structure reduces the overall space occupation while maintaining both surge protection and EMI filtering functions.
Solution Approach 2:
The integrated magnetic device performs multiple functions simultaneously: the first winding provides decoupling inductance for surge protection, the second winding provides common mode inductance for EMI filtering, and the third winding provides additional decoupling inductance. This multi-functional design allows a single component to replace what would traditionally require separate devices.
2Reliability
If separate decoupling inductor and common mode choke components are used, then each component can perform its specific function, but the manufacturing cost increases
Solution Approach 1:
By integrating the decoupling inductor and common mode choke into a single magnetic core structure, the patent reduces the total number of components that need to be manufactured, stored, and assembled. This consolidation lowers manufacturing costs through reduced material usage, simplified production processes, and decreased assembly complexity.
3Reliability
If separate decoupling inductor and common mode choke components are used, then each component can perform its specific function, but the overall device weight increases
Solution Approach 1:
The patent merges two separate magnetic components into one integrated magnetic device with a unified magnetic core structure. This consolidation eliminates the weight of duplicate magnetic materials, windings, and structural components that would exist if separate decoupling inductor and common mode choke components were used, thereby reducing overall device weight.
4Ease of operation
If traditional separate components are used, then assembly is straightforward, but cold soldering issues occur and power density is low
Solution Approach 1:
By integrating multiple functions into a single component, the patent reduces the number of soldering joints required during assembly. Fewer connection points mean reduced risk of cold soldering issues. Additionally, the integrated design improves power density by concentrating the magnetic path and windings in a compact structure, enhancing energy efficiency.
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 integrated magnetic device reduces space occupation by over 54% and weight by 61%, lowers manufacturing costs by more than 50%, and enhances both lightning protection and EMI filtering performance with improved energy efficiency and reduced risk of cold soldering.
Implementation Method 1
the first magnetic core column and the second magnetic core column and the first and second magnetic bases together forming a closed magnetic path, and the first magnetic core column and the second magnetic core column having windings wound thereon so as to form one or more common mode chokes
Implementation Method 2
a middle magnetic core portion extending between the first and second magnetic bases and located between the first magnetic core column and the second magnetic core column along the second direction, with an air gap being provided in an extension direction of the middle magnetic core portion which is made of high saturation magnetic material, and the middle magnetic core portion comprising a winding wound thereon so as to form a decoupling inductor
Implementation Method 3
In a common mode, the current in the windings travels in the same direction so that the combined magnetic flux adds to create large impedance to block the noise
Implementation Method 4
In a differential mode, the current travels in opposite directions and the magnetic flux generated subtracts or cancels out so that no impedance is created to suppress the normal mode signal
Data Source
AI summary
An integrated magnetic component has a common magnetic core portion having a first magnetic base and a second magnetic base that is spaced in a first direction from the first magnetic base; a first magnetic core column and a second magnetic core column, which extend between the first and second magnetic bases and spaced with each other along a second direction perpendicular to the first direction. The first magnetic core column and the second magnetic core column and the first and second magnetic bases form a closed magnetic path. The first magnetic core column and the second magnetic core column have windings forming one or more common mode chokes. A middle magnetic core portion has an air gap being provided in an extension direction of the middle magnetic core portion which is made of high saturation magnetic material, and has a winding forming a decoupling inductor.