Segmented LC Filter Choke for High-Frequency Interference Attenuation
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Solution Overview
Problem
Conventional LC filters are costly, space-intensive, and have limited reproducibility due to complex winding processes, making it difficult to achieve desired filter effects, especially in reducing high-frequency interfering signals effectively.
Innovation Solution
An LC filter arrangement with a choke having multiple turns formed by separate conductor segments, each connected to a circuit board, and a holder with insulating material to ensure precise positioning and reproducibility, allowing for the addition of taps and impedances to adjust the filter effect, reducing stray capacitance and enabling late-stage adaptation of filter properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multi-stage LC filters are used to achieve desired attenuation of interfering signals, then the filter effect is improved, but the device complexity and installation space increase
Solution Approach 1:
The patent divides the choke into multiple independent conductor segments (first conductor segment, second conductor segment, third conductor segment) that can be separately positioned and connected. This segmentation allows each segment to contribute to the overall filter effect while maintaining a single-stage filter structure, achieving multi-stage attenuation performance without the complexity of cascaded filter stages.
Solution Approach 2:
The patent positions conductor segments in three-dimensional space around a magnetic core, utilizing spatial arrangement rather than sequential cascading. The segments are arranged at different positions (first position, second position, third position) and connected in series, creating an extended inductance path that achieves higher attenuation in a compact single-stage configuration.
2Ease of manufacture
If conventional winding processes are used to manufacture chokes, then production is simplified, but manufacturing precision and reproducibility deteriorate
Solution Approach 1:
The choke is constructed from separate conductor segments rather than a continuous winding. Each segment can be independently manufactured, positioned, and connected, eliminating the complexity of manual winding processes while ensuring consistent inductance values through precise positioning on the magnetic core.
Solution Approach 2:
The patent replaces the mechanical winding process with a positioning system where conductor segments are placed at specific positions around the magnetic core and electrically connected. This substitution eliminates the variability inherent in manual winding while maintaining ease of manufacture through standardized positioning structures.
3Reliability
If filter parameters are optimized after design, then filter performance is improved, but production time and cost increase
Solution Approach 1:
The patent incorporates taps on the conductor segments that allow for adjustable connections, enabling filter parameter optimization after the basic structure is assembled. The taps provide multiple connection points that can be selectively used to fine-tune the filter characteristics without requiring complete disassembly or remanufacturing.
Solution Approach 2:
The conductor segments are pre-positioned and pre-connected during assembly, with taps already available for potential adjustments. This preliminary configuration allows for rapid parameter optimization if needed, while the default configuration provides immediate functional performance without requiring additional adjustment steps.
4Device complexity
If single-stage LC filters are used to reduce cost and space, then device complexity is reduced, but the filter effect deteriorates due to insufficient attenuation
Solution Approach 1:
The patent merges multiple conductor segments into a single integrated choke structure that functions as one unified inductance element. The segments are electrically connected in series and magnetically coupled through the common magnetic core, combining their individual filter contributions to achieve high attenuation performance equivalent to multi-stage filters while maintaining a single-stage configuration.
Solution Approach 2:
The choke employs a composite structure combining multiple conductor segments with a magnetic core material. This composite construction allows each segment to contribute to the overall inductance and filter effect, achieving enhanced attenuation performance that would normally require multiple separate filter stages but is realized here through the integrated composite choke design.
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 solution provides a highly reproducible, cost-effective, and compact LC filter arrangement that can effectively attenuate interfering signals across a wide frequency range, reducing production complexity and improving filter performance.
Implementation Method 1
The turns are inductively coupled to one another via the magnetic core (5)
Implementation Method 2
a magnetic core (5), and a choke (4) having a plurality of turns surrounding the magnetic core
Implementation Method 3
a filter capacitor (8) that connects the first output terminal (3a) to the second output terminal (3b)
Implementation Method 4
The holder (20) is designed to position the conductor segments (7.1-7.9) in a predefined position relative to one another and to electrically insulate them from the magnetic core (5)
Data Source
AI summary
An LC filter arrangement includes a filter capacitor that connects the first output terminal to the second output terminal, a magnetic core, and a choke having a plurality of turns surrounding the magnetic core, and a first choke terminal and a second choke terminal. Each of the turns is formed by a separate conductor segment, at least partially surrounding the magnetic core. The LC filter arrangement is mounted on a circuit board and is electrically connected to a conductor track of the circuit board.