Planar Bus Bar Noise Filter for Easier EMI Suppression
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The challenge lies in manufacturing a noise filter for power supply devices using a bus bar with a planar structure, as existing designs with three-dimensional bus bars are difficult to produce due to the complexity of forming reactors in multiple layers and connecting them in series.
Innovation Solution
A noise filter design featuring a first bus bar with extending and coupling wiring portions, a lead conductor, a capacitor connected to the ground, and a magnetic core with an opening for the coupling wiring, allowing for a planar structure that can be manufactured by punching or pressing, effectively suppressing electromagnetic noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a three-dimensional bus bar structure with reactors in multiple layers is used to reduce electromagnetic noise, then noise suppression capability is improved, but manufacturing difficulty increases significantly
Solution Approach 1:
The patent transitions from a three-dimensional bus bar structure with reactors in multiple layers to a planar two-dimensional structure. The first and second reactors are arranged side-by-side in the same plane rather than stacked in different layers, and the lead wire is routed through a hole in the magnetic core rather than being drawn from between stacked reactors. This dimensional simplification enables manufacturing by punching or pressing a metal plate while maintaining noise suppression functionality.
2Reliability
If reactors are formed by deformation of power supply lines in multiple layers, then noise filter performance is improved, but device complexity increases
Solution Approach 1:
The patent divides the single bus bar into two separate bus bars (first bus bar and second bus bar), each forming its own reactor in the same plane. This segmentation allows each reactor to be independently formed and connected in series through the magnetic core, simplifying the overall structure while maintaining the dual-reactor noise filtering performance.
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
This design enables the production of a noise filter with improved noise suppression capabilities, particularly for high-frequency noise, by optimizing the mutual inductance and capacitance, enhancing the manufacturing feasibility of planar bus bars.
Implementation Method 1
a magnetic core 18 having an opening 18d in a central portion, the magnetic core 18 disposed in such a manner that the first coupling wiring portion 11c passes through the opening 18d
Implementation Method 2
a first capacitor 14 having a first end connected with a second end of the first lead conductor 12 and a second end connected with a ground
Data Source
AI summary
A noise filter includes: a first bus bar that is electrical wiring of a flat plate, the first bus bar including a first extending wiring portion extending in a first direction, a second extending wiring portion extending in a second direction that is a direction opposite to the first direction, and a first coupling wiring portion connecting the first extending wiring portion and the second extending wiring portion; a first lead conductor having a first end connected with the first coupling wiring portion; a first capacitor having a first end connected with a second end of the first lead conductor and a second end connected with a ground; and a magnetic core having an opening in a central portion, the magnetic core disposed in such a manner that the first coupling wiring portion passes through the opening.