Stacked Solid Electrolytic Capacitor Cathode Layout for Noise Filtering
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Solution Overview
Problem
Conventional surface mount capacitors lack improved noise filter characteristics.
Innovation Solution
A solid electrolytic capacitor design with stacked capacitor elements, anode and cathode terminals, and a specific cathode terminal configuration that includes a narrow second portion and a side wall connected to the cathode part, enhancing noise filter performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional surface mount capacitor design is used, then the structure is simple and easy to manufacture, but the noise filter characteristics are insufficient
Solution Approach 1:
The cathode terminal is divided into multiple segments: a first portion with a first width, a second portion with a second width smaller than the first width, and a third portion. This segmentation creates a non-uniform structure that reduces inductance and improves noise filter characteristics while maintaining manufacturability through standardized manufacturing processes.
Solution Approach 2:
The cathode terminal exhibits local quality variations with different widths at different portions. The first portion has a larger width for stable electrical connection, the second portion has a smaller width to reduce inductance, and the third portion connects to the cathode part. This local variation in geometry optimizes noise filtering performance without requiring complete structural redesign.
2Reliability
If the cathode terminal has a uniform width, then the manufacturing is simpler, but the inductance is higher and noise filter characteristics are worse
Solution Approach 1:
The width parameter of the cathode terminal is changed along its length, creating a tapered or stepped structure. The first portion has width W1, the second portion has width W2 where W2 < W1, and the third portion connects to the cathode part. This parameter variation reduces inductance by minimizing the loop area, thereby improving noise filter characteristics while remaining compatible with standard manufacturing techniques.
Data Source
AI summary
A solid electrolytic capacitor includes: a plurality of capacitor elements stacked on each other, each of the plurality of capacitor elements including an anode body and a cathode part; two anode terminals electrically connected to the anode body; a cathode terminal electrically connected to the cathode part; and an outer packaging resin. The anode body has two protrusions respectively protruding from both ends of the cathode part. Each of the two protrusions is electrically connected to a corresponding one of the two anode terminals. The two protrusions in each of the plurality of capacitor elements are electrically connected to each other. The cathode part includes a first portion having a first width and a second portion having a second width smaller than the first width. The cathode terminal includes a first side wall electrically connected to a side surface of the second portion of the cathode part.