Busbar Noise Filter with Adjustable Capacitor Connections
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional bus bar noise filters lack versatility as they require dedicated components designed for specific electrical equipment, limiting their general applicability due to varying noise radiation characteristics and frequency ranges.
Innovation Solution
A bus bar device with adjustable noise cancellation characteristics using a ferrite core and capacitors, where the connection paths and positions of capacitors can be modified to match different electrical equipment, allowing for commonization of components and easy adjustment of noise elimination characteristics without changing the ferrite core's impedance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If dedicated ferrite cores and capacitors are designed for each electrical equipment, then noise elimination characteristic is optimized for specific equipment, but component versatility and general applicability decrease
Solution Approach 1:
The patent applies universality by designing a standardized ferrite core and capacitor assembly that can be used across multiple electrical equipment types. Instead of creating dedicated components for each device, the invention uses a universal configuration where capacitors are connected to specific regions (first region vs. second region) of the ferrite core to achieve different noise elimination characteristics. This allows the same physical components to serve multiple applications by simply changing connection topology rather than redesigning components.
Solution Approach 2:
The patent implements dynamics by making the capacitor connections adjustable and reconfigurable. The capacitors can be connected to different regions of the ferrite core depending on the noise characteristics of the connected electrical equipment. This dynamic reconfiguration capability allows the noise filter to adapt to different frequency ranges and noise patterns without requiring physical changes to the ferrite core or capacitor components themselves.
2Ease of manufacture
If capacitor connection paths are fixed, then manufacturing is simplified, but noise elimination cannot be adjusted for different electrical equipment characteristics
Solution Approach 1:
The patent applies segmentation by dividing the ferrite core into distinct regions (first region and second region) with specific connection points. The capacitors are connected to these segmented regions through selectable connection paths. This segmentation allows the manufacturing process to use standardized components and connection methods while still enabling post-manufacturing configuration adjustments to match different electrical equipment noise characteristics.
3Reliability
If ferrite core impedance is changed to adjust noise elimination, then noise cancellation is optimized, but component standardization and commonality decrease
Solution Approach 1:
The patent applies parameter changes by altering the connection configuration of capacitors rather than changing the ferrite core impedance. By connecting capacitors to different regions of the ferrite core (first region vs. second region), the effective electrical parameters of the noise filter change, allowing optimization for different noise frequency ranges. This approach maintains ferrite core standardization while achieving parameter adjustment through connection topology changes.
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 flexible noise elimination across various frequency ranges by adjusting capacitor connections and bus bar shape, enhancing component commonality and accuracy in matching electrical equipment characteristics without increasing device size.
Implementation Method 1
a noise filter comprising a coil and capacitors has been proposed to be added to bus bars
Implementation Method 2
high-frequency noise components resulting from operation of the equipment such as switching have been required to be canceled
Implementation Method 3
a line control (LC) circuit configured of a coil and capacitors, or the like, is used to attenuate noise
Data Source
Figure 1
Figure 2~3
Figure 4~5
AI summary
A frequency range and an attenuation amount of noise to be eliminated change depending upon to which one of two regions of side frames (34, 35) of a bottom (31) serving as a ground conductor surface first, second and third capacitors (21, 22, 23) are connected. Even if impedance of a ferrite core (12), the shape of a casing (11), capacitances of the capacitors (21, 22, 23), and the like are constant, a noise elimination characteristic changes by changing positions of the first to third capacitors (21, 22, 23). As a result, components including the ferrite core (12) are commonalized and the noise elimination characteristic is easily adjusted in spite of characteristics of electrical equipment.