Multi-Layer Filter With Stacked Electrodes for Low-Frequency Noise
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Solution Overview
Problem
Existing filter structures with a multi-layer structure have a limited capacity for differential mode capacitors, making them ineffective for filtering low-frequency noise in direct current power supplies, and require a large number of components with high location and accuracy requirements.
Innovation Solution
A filter with a stacked structure comprising two common electrode layers and two inner electrode layers, where the inner electrode layers are disposed between the common electrode layers, each connected to grounding and signal electrodes, enhancing the capacity and filtering effectiveness for low-frequency noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a multi-layer filter structure with two external common electrode layers and at least two inner electrode layers is used, then the filtering capability for high-frequency noise is improved, but the capacity of the differential mode capacitor remains relatively small, making it ineffective for low-frequency noise filtering
Solution Approach 1:
The patent combines multiple electrode layers (first common electrode layer, second common electrode layer, first inner electrode layer, second inner electrode layer) into a single integrated filter structure. This merging allows the formation of both common mode capacitors (between inner and common electrode layers) and differential mode capacitors (between inner electrode layers), achieving multiple filtering functions in one component while increasing the differential mode capacitor capacity without requiring separate discrete components
Solution Approach 2:
The patent transitions from a planar arrangement of discrete capacitors to a three-dimensional stacked multi-layer electrode structure. By stacking electrode layers in the vertical dimension and creating overlapping areas between layers, the patent achieves increased capacitor capacity and improved filtering performance without increasing the footprint area, effectively solving the limitation of small capacitor capacity in conventional multi-layer structures
2Reliability
If discrete capacitor components are used to connect a circuit, then the filtering function can be achieved, but a large number of capacitor components are used and occupy large space
Solution Approach 1:
The patent merges multiple discrete capacitor functions into a single integrated filter component. Instead of using separate common mode capacitors and differential mode capacitors that would require multiple discrete components and occupy significant space, the patent creates both types of capacitors within one multi-layer structure, dramatically reducing the space required while maintaining comprehensive filtering functionality
Solution Approach 2:
The filter structure serves multiple functions simultaneously: it provides common mode noise filtering through capacitors formed between inner electrode layers and common electrode layers, and differential mode noise filtering through capacitors formed between inner electrode layers. This multi-functionality eliminates the need for separate filtering components, reducing overall component count and space occupation
3Reliability
If discrete capacitor components are used, then the filtering processing can be performed, but a high requirement is imposed on location and accuracy of component disposition
Solution Approach 1:
The patent merges the functions of multiple discrete capacitors into a single integrated structure with predetermined electrode connections. The internal electrode arrangements (common electrode layers and inner electrode layers) are pre-configured to create both common mode and differential mode capacitors with specific capacitance values, eliminating the need for precise manual placement and connection of multiple discrete components during assembly
4Reliability
If a multi-layer filter structure is used, then the filtering capability is improved, but the capacity of the differential mode capacitor is relatively small, and the filter can be used only in high-frequency filter circuits
Solution Approach 1:
The patent combines multiple electrode layers to create a unified filter structure that simultaneously provides both common mode and differential mode filtering capabilities. The overlapping areas between the first common electrode layer, second common electrode layer, first inner electrode layer, and second inner electrode layer form capacitors with sufficient capacity to handle low-frequency noise, expanding the filter's applicability from high-frequency only to both high and low-frequency ranges
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 filter achieves a larger capacity for differential mode capacitors, improving filtering efficiency for low-frequency noise in direct current power supplies while reducing the number of components and fabrication costs, and providing a compact size for easier integration.
Implementation Method 1
a filter, comprising two common electrode layers, two inner electrode layers and first, second and third electrical insulation layers, wherein the two inner electrode layers are located between the two common electrode layers
Data Source
Figure 1A~1B
Figure 1C~1D
Figure 2~3
AI summary
The present invention provides a filter. The filter includes two common electrode layers and two inner electrode layers, where the two inner electrode layers are located between the two common electrode layers, and an electrical insulation layer is disposed between any two adjacent electrode layers of the two common electrode layers and the two inner electrode layers; each of the two common electrode layers is connected to at least one grounding electrode; and each of the two inner electrode layers is connected to at least one signal electrode. The filter provided by embodiments of the present invention can perform filtering processing on low-frequency noise such as that of a direct current power supply, and has a good filtering processing effect.