PCB-Mounted Common Mode Filter With Through-Hole Thin Structure
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Solution Overview
Problem
Conventional common mode filters are limited by their size and thickness, which impedes miniaturization and thinning, and their installation on circuit boards increases the overall thickness of electronic devices.
Innovation Solution
A common mode filter design that omits the case or bobbin, utilizing a ring-shaped magnetic core with coils wound around it, coupled to a base member with connector members that serve as terminals and fastening elements, allowing installation in an arrangement hole of a circuit board to reduce thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate case is used to cover the magnetic core for insulation and protection, then reliability is improved, but the thickness of the common mode filter increases
Solution Approach 1:
The base member integrates multiple functions: it provides mechanical support for the magnetic core, electrical insulation between the magnetic core and circuit board, and mounting attachment. By combining these functions into a single component, the need for a separate protective case is eliminated, reducing overall thickness while maintaining reliability
Solution Approach 2:
The base member serves multiple purposes simultaneously: it acts as an insulating barrier, a mechanical support structure, and a mounting interface with the circuit board. This multi-functionality eliminates the need for additional separate components, thereby reducing the filter's thickness without compromising insulation or protection
2Reliability
If the common mode filter is designed with conventional structure including case, then insulation and durability are secured, but the overall installation thickness increases
Solution Approach 1:
The base member integrates multiple functions: it provides mechanical support for the magnetic core, electrical insulation between the magnetic core and circuit board, and mounting attachment. By combining these functions into a single component, the need for a separate protective case is eliminated, reducing overall thickness while maintaining reliability
Solution Approach 2:
The arrangement hole penetrates through the circuit board, allowing the common mode filter to be installed in a vertical dimension rather than adding horizontal thickness. The base member is caught on the edge of the arrangement hole, utilizing the circuit board's thickness to accommodate the filter
3Reliability
If a separate case is used to surround the magnetic core, then protection is improved, but space utilization is restricted
Solution Approach 1:
The base member integrates multiple functions: it provides mechanical support for the magnetic core, electrical insulation between the magnetic core and circuit board, and mounting attachment. By combining these functions into a single component, the need for a separate protective case is eliminated, reducing overall thickness while maintaining reliability
Solution Approach 2:
The arrangement hole penetrates through the circuit board, allowing the common mode filter to be installed in a vertical dimension rather than adding horizontal thickness. The base member is caught on the edge of the arrangement hole, utilizing the circuit board's thickness to accommodate the filter
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 design achieves a thin profile of 5 to 6 mm, reducing the overall installation thickness and enabling efficient space utilization without compromising insulation and durability.
Implementation Method 1
a common mode filter passes signals that are required for circuit operation and removes common mode noise
Data Source
AI summary
A common mode filter is provided. A common mode filter according to an exemplary embodiment of the present invention comprises: a ring-shaped magnetic core made of a magnetic material and installed so as to be positioned in an arrangement hole which is formed through a circuit board in a predetermined area; a plurality of coils wound around an outer surface of the magnetic core; and a base member to which the magnetic core having the plurality of coils wound thereon is coupled, and having a plurality of connector members for electrically connecting the plurality of coils to the outside, wherein the base member is installed such that a portion thereof is caught on an edge side of the arrangement hole.