EMC Filter Structure With Nested Choke for Coupling Noise Control
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Solution Overview
Problem
Traditional EMC filters face challenges in achieving both a small size and high performance due to limitations such as mutual coupling effects between inductors and capacitors, leading to decreased electromagnetic noise suppression and increased DC resistance loss.
Innovation Solution
The filter structure incorporates a substrate with capacitor and choke elements, utilizing ferrite cores and magnetic conductive members to reduce coupling noise effects and increase leakage inductance, thereby improving performance and miniaturization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the number of windings in a common-mode choke is increased to suppress electromagnetic noise, then the electromagnetic noise suppression performance is improved, but the DC resistance loss increases and performance degrades
Solution Approach 1:
The magnetic conductive member is nested within the capacitor element's housing structure, forming a nested configuration where the magnetic conductive member is positioned inside the capacitor's structural envelope. This nesting allows the magnetic conductive member to be integrated into the existing capacitor structure without requiring additional external space, thereby reducing the overall filter size while maintaining effective electromagnetic noise suppression through enhanced magnetic coupling.
Solution Approach 2:
The invention transitions from a planar PCB layout to a three-dimensional stacked configuration by positioning the magnetic conductive member vertically above the PCB plane and integrating it with the capacitor element. This dimensional change enables better spatial utilization and reduces mutual coupling effects between inductors and capacitors that are problematic in traditional planar arrangements.
2Volume of moving object
If the filter size is reduced for compact design, then the miniaturization is achieved, but the electromagnetic noise suppression ability decreases
Solution Approach 1:
The magnetic conductive member is nested within the capacitor element's housing structure, forming a nested configuration where the magnetic conductive member is positioned inside the capacitor's structural envelope. This nesting allows the magnetic conductive member to be integrated into the existing capacitor structure without requiring additional external space, thereby reducing the overall filter size while maintaining effective electromagnetic noise suppression through enhanced magnetic coupling.
Solution Approach 2:
The invention merges the inductor and capacitor structures by positioning the magnetic conductive member of the inductor directly above the capacitor element and establishing magnetic coupling between them. This merging eliminates the need for separate inductor and capacitor housings, reducing the overall filter size while maintaining effective electromagnetic noise suppression through the integrated magnetic coupling structure.
3Ease of manufacture
If traditional PCB layout is used with separate inductor and capacitor structures, then the manufacturing is simple, but the mutual coupling effect between inductors and capacitors increases
Solution Approach 1:
The invention transitions from a planar PCB layout to a three-dimensional stacked configuration by positioning the magnetic conductive member vertically above the PCB plane and integrating it with the capacitor element. This dimensional change enables better spatial utilization and reduces mutual coupling effects between inductors and capacitors that are problematic in traditional planar arrangements.
Solution Approach 2:
The magnetic conductive member is nested within the capacitor element's housing structure, forming a nested configuration where the magnetic conductive member is positioned inside the capacitor's structural envelope. This nesting allows the magnetic conductive member to be integrated into the existing capacitor structure without requiring additional external space, thereby reducing the overall filter size while maintaining effective electromagnetic noise suppression through enhanced magnetic coupling.
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 effectively reduces coupling noise and leakage inductance, enhancing the EMC filter's performance while allowing for compact design and cost savings.
Implementation Method 1
a magnetic conductive member... to reduce coupling noise effects
Implementation Method 2
utilizing ferrite cores and magnetic conductive members to increase leakage inductance
Data Source
AI summary
A filter structure is provided. The filter structure includes a substrate, a capacitor element, and a first choke element. The capacitor element and the first choke element are disposed on the substrate. The first choke element has a first ferrite core, two first windings wound around the first ferrite core, and a first magnetic conductive member. The first ferrite core is received in the first magnetic conductive member and located adjacent to the first choke element.