Two-Stage Noise Filter With Shared Core And Impedance Balancer
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Solution Overview
Problem
Conventional two-stage noise filters for electronic devices have a complex structure and high manufacturing costs due to separate cores for each filter, limiting miniaturization and increasing the number of parts and occupied space.
Innovation Solution
A two-stage noise filter design that shares a single core between two filters, with impedance balancers to maintain impedance balance, reducing the number of parts and space while simplifying the structure and reducing manufacturing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate cores are used for each filter in a conventional two-stage noise filter, then the filtering performance is maintained, but the number of parts, size, and occupied space increase
Solution Approach 1:
The patent merges two separate filter cores into a single integrated core structure. The first and second filters are wound on different sections of the same core, with the third coil wound on a first section and the fourth coil wound on a second section of the same core. This consolidation reduces the number of discrete components and decreases the overall occupied space while maintaining the filtering functionality of both stages.
Solution Approach 2:
The single core serves multiple functions by supporting both the first filter (with first and second coils) and the second filter (with third and fourth coils). This multi-functional core design eliminates the need for separate dedicated cores for each filter stage, thereby reducing part count and space requirements while preserving the noise filtering performance of both stages.
2Reliability
If separate cores are used for each filter, then the filtering performance is maintained, but the structure becomes more complex and manufacturing costs increase
Solution Approach 1:
The patent combines two separate core structures into one integrated core, reducing the total number of components. The single core has multiple sections that accommodate different coil windings, simplifying the overall structure by eliminating the need for multiple discrete cores and their associated mounting hardware, thereby reducing structural complexity.
Solution Approach 2:
The single core is designed to perform multiple filtering functions simultaneously. By winding different coils on different sections of the same core, the structure achieves the functionality of two separate filters with one core, thereby reducing device complexity and the number of parts required.
3Reliability
If separate cores are used for each filter, then the filtering performance is maintained, but manufacturing costs and man hours increase
Solution Approach 1:
The patent merges the manufacturing process by consolidating two separate cores into one. This single core can be manufactured as a single piece or pre-assembled unit, reducing the number of manufacturing steps, assembly operations, and quality checks required compared to producing and assembling two separate cores, thereby lowering manufacturing costs and man hours.
Solution Approach 2:
The single multi-functional core reduces manufacturing complexity by eliminating the need to produce multiple identical or similar core components. This consolidation streamlines the supply chain, reduces inventory requirements, and simplifies the assembly process, leading to lower manufacturing costs and improved ease of manufacture.
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 shared core design reduces the size and complexity of the noise filter, allowing for miniaturization of electronic devices while maintaining effective electromagnetic interference suppression, thereby lowering manufacturing costs and simplifying the structure.
Implementation Method 1
The first and second coils 11 and 13 generate induced electromotive force based on variance in a supplied amount of electric current. When an alternating current (AC) having a predetermined frequency flows in between the first and third coils 11 and 21 and between the second and fourth coils 13 and 23, magnetic flux occurs in the first and second cores 17 and 27 by electromagnetic induction
Implementation Method 2
The third and fourth coils 21 and 23 generate induced electromotive force based on variance in a supplied amount of electric current. When an alternating current (AC) having a predetermined frequency flows in between the first and third coils 11 and 21 and between the second and fourth coils 13 and 23, magnetic flux occurs in the first and second cores 17 and 27 by electromagnetic induction
Implementation Method 3
The capacitor 30 serves to limit an electric current, which has a predetermined frequency and flows in between the first and third coils 11 and 21 and between the second and fourth coils 13 and 23, from exceeding a predetermined amount
Data Source
AI summary
Disclosed are a two-stage noise filter, in which two filters are integrated, and an electronic device including the same. The two-stage noise filter includes a core configured to include a primary side and a secondary side opposite to the primary side; a first filter configured to include a first coil wound on the primary side of the core and a second coil wound on the secondary side of the core; a second filter configured to include a third coil wound on the primary side of the core in series with the first coil and a fourth coil wound on the secondary side of the core in series with the second coil; and an impedance balancer configured to keep a balance of impedance between the first and second filters.