Noise Filter with Flat Electrode Ground Connection
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Solution Overview
Problem
Conventional π-type noise filters require significant space for routing leads between capacitors and ground terminals, leading to enlarged designs and inefficiencies.
Innovation Solution
The noise filter integrates capacitors with flat outer surfaces serving as ground-side electrodes directly connected to the ground terminal, eliminating the need for lead routing and allowing for miniaturization, with additional features like busbars and magnetic cores enhancing filter performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If leads are used to connect capacitors to ground terminal, then electrical connection is achieved, but space is required for lead routing which enlarges the noise filter
Solution Approach 1:
The ground-side electrode of the capacitor is merged with the ground terminal through direct contact, eliminating the need for separate lead routing. The capacitor's outer surface itself serves as the connection interface, combining the electrical connection function with the capacitor structure.
Solution Approach 2:
The lead routing function is extracted and eliminated from the design. Instead of using separate leads to connect the capacitor to the ground terminal, the connection is achieved through direct contact between the capacitor's ground-side electrode and the ground terminal.
2Reliability
If separate filter elements are provided, then filter performance is achieved, but number of components increases
Solution Approach 1:
The lead is given multiple functions: it serves as both the electrical connection element and the filter element. By forming an electrical element (such as an inductor) within the lead structure, the same component that provides electrical connectivity also provides noise filtering functionality.
Solution Approach 2:
The filter element is merged with the lead structure. Instead of providing a separate filter element, the lead itself is configured to function as the filter element, combining the connection function and filtering function into a single component.
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 configuration minimizes the noise filter's size while improving filter performance by integrating components and eliminating the need for separate lead routing, resulting in a more compact and effective π-type noise filter.
Implementation Method 1
A magnetic core may be provided in a conductive path connecting the input/output-side electrode and the input/output terminal. According to this configuration, filter performance is improved as compared to the case where the filter element is constituted only by the capacitor.
Data Source
AI summary
A noise filter (A) includes a case (10) and capacitors (20) accommodated in the case (10). Substantially flat surfaces of the capacitors (20) serve as ground-side electrodes (23). A ground terminal (17) is connected directly to the ground-side electrodes (23), and input/output terminals (15) are connected to input/output-side electrodes (21) of the capacitors (20). A routing space for leads for connecting the capacitors (20) and the ground terminal (17) is not necessary in the case (10). Therefore, the case (10) can be miniaturized.