Integrated PCB Filter Element with Annular Magnetic Core
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Solution Overview
Problem
Conventional filter apparatuses for reducing common-mode and differential mode interferences in pulse-controlled inverters require significant conceptual effort, leading to high costs and large installation space requirements.
Innovation Solution
An electrical filter element with a dielectric printed circuit board substrate, an annular magnetic core, and internal electrical connection elements, allowing for efficient filtering of AC voltage components in limited space through a structured inductive component with adaptable inductance and additional components for interference filtering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If conventional filter apparatuses are used to reduce common-mode and differential mode interferences, then interference filtering is achieved, but installation space requirements increase significantly
Solution Approach 1:
The patent combines multiple filtering functions (common-mode and differential mode interference filtering) into a single integrated filter element. The filter element integrates an annular magnetic core with printed circuit board substrates that provide both common-mode chokes and differential mode filtering capabilities, eliminating the need for separate filter components and reducing overall installation space.
Solution Approach 2:
The filter element employs a nested structure where the annular magnetic core is positioned between two printed circuit board substrates. The inner region of the magnetic core contains additional components, creating a compact nested arrangement that maximizes filtering functionality within minimal volume.
2Object-affected harmful factors
If conventional filter apparatuses are used to reduce common-mode and differential mode interferences, then interference filtering is achieved, but device complexity and costs increase
Solution Approach 1:
The filter element serves multiple functions simultaneously: it provides common-mode interference filtering through the annular magnetic core, differential mode interference filtering through the printed circuit board trace structures, and electrical connection functions. This multi-functionality eliminates the need for separate common-mode filters and differential mode filters, simplifying the overall device architecture.
Solution Approach 2:
The patent merges the functions of common-mode chokes, differential mode filters, and electrical connections into a single integrated filter element. The printed circuit board substrates serve both as structural support and as filtering elements through their trace configurations, while the annular magnetic core provides common-mode suppression, all within one component.
3Object-affected harmful factors
If high inductance is required for effective AC voltage component filtering, then filtering performance improves, but installation space volume increases
Solution Approach 1:
The filter element uses composite construction combining ferromagnetic material for the annular core with printed circuit board substrates. This composite structure achieves high inductance in a compact form by optimizing the magnetic path through the annular core while maintaining a small overall footprint through the integrated PCB design.
Solution Approach 2:
The patent transitions from traditional three-dimensional coil windings to a planar two-dimensional printed circuit board configuration. The filtering function is achieved through trace patterns on the PCB substrates that create inductive effects without requiring vertical space for multiple winding layers, thus achieving high inductance in a reduced volume.
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
Enables efficient filtering of AC voltage components with improved filter properties in a compact form, allowing for flexible adaptation to different applications and reduced installation space needs.
Implementation Method 1
The present invention creates an inductive component which makes it possible to filter AC voltage components with limited installation space volume
Implementation Method 2
An electrical filter element with a dielectric printed circuit board substrate, an annular magnetic core, and internal electrical connection elements
Data Source
AI summary
The invention relates to an electrical filter element (1) for filtering alternating voltage interference. The electrical filter element (1) comprises two dielectric circuit board substrates (11, 12) having a magnetic core (13) arranged between the circuit board substrates. The magnetic core (13) has a material-free inner region (13a), in which electrical connection elements (21-24) are provided between the two dielectric circuit board substrates (11, 12). Furthermore, electrical connection elements (31, 32) can also be provided between the two dielectric circuit board substrates (11, 12) in an outer region of the magnetic core (13).