Dual-Core Magnetic Element for Common-Mode EMI Suppression
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Solution Overview
Problem
Conventional magnetic elements with single cores are ineffective in suppressing electromagnetic interference (EMI) in variable-frequency drives, and using two separate magnetic elements with single cores requires additional reactors and does not enhance common mode inductance effectively.
Innovation Solution
A magnetic element design featuring two magnetic cores and two windings, where the cores are structured to allow for operation in differential and common modes, with specific core and winding configurations that enable enhanced EMI suppression by creating distinct magnetic force loops and air gaps to optimize inductance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single magnetic core is used, then the device complexity is reduced, but the electromagnetic interference suppression capability deteriorates
Solution Approach 1:
The patent combines two magnetic cores into a single integrated magnetic element structure. The first and second magnetic cores are positioned adjacent to each other and share a common winding structure, merging what would traditionally be two separate components into one unified device that provides both differential mode and common mode inductance while suppressing electromagnetic interference.
Solution Approach 2:
The magnetic element is designed to perform multiple functions simultaneously: it provides differential mode inductance for differential mode operation, common mode inductance for common mode operation, and electromagnetic interference suppression. This multi-functionality is achieved through the specific configuration of two magnetic cores with windings wrapped around both cores, allowing the single device to replace what would traditionally require multiple separate components.
2Object-affected harmful factors
If two separate magnetic elements are used, then the electromagnetic interference suppression is improved, but the device complexity and space requirement increase
Solution Approach 1:
The patent merges two separate magnetic elements into one integrated magnetic element. The first and second magnetic cores are positioned adjacent to each other within the same magnetic element housing, sharing common structural components and winding arrangements. This consolidation reduces the total number of separate reactors from two to one while maintaining the ability to suppress both differential mode and common mode electromagnetic interference.
Solution Approach 2:
The single magnetic element is designed with universal functionality to handle both differential mode and common mode operations. The specific winding configuration around both magnetic cores enables the device to provide the necessary inductance for both modes simultaneously, making it a universal solution that replaces two separate single-function devices.
3Object-affected harmful factors
If two separate magnetic elements are used, then the common mode inductance enhancement is improved, but the space requirement and device complexity increase
Solution Approach 1:
The patent combines the space required for two separate magnetic elements into a single compact magnetic element structure. The first and second magnetic cores are positioned adjacent to each other within the same housing, sharing common structural support and winding space. This merging reduces the total footprint area while maintaining sufficient common mode inductance through the coupled magnetic core configuration.
Solution Approach 2:
The patent optimizes the spatial arrangement by positioning the two magnetic cores in a compact adjacent configuration within the same plane or three-dimensional space. This dimensional optimization allows both cores to coexist in a reduced footprint compared to using two separate elements, effectively utilizing available space to achieve high common mode inductance in a compact form factor.
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 magnetic element effectively operates in both differential and common modes, enhancing common mode inductance and improving EMI suppression, thereby addressing the limitations of conventional designs.
Implementation Method 1
The first winding is wound around the first middle core part and the third lateral core part. The second winding is wound around the second middle core part and the second lateral core part.
Data Source
AI summary
A magnetic element includes a first magnetic core, a second magnetic core, a first winding and a second winding. The first magnetic core includes a first lateral core part, a second lateral core part and a first middle core part between the first and second lateral core parts. The second magnetic core includes a third lateral core part, a fourth lateral core part and a second middle core part between the third lateral core part and the fourth lateral core part. The second middle core part, third lateral core part, and fourth lateral core part are respectively located beside the first middle core part, first lateral core part, and second lateral core part. The first winding is wound around the first middle core part and the second middle core part. The second winding is wound around the second lateral core part and the fourth lateral core part.