Three-Terminal Capacitor Insulation and ESL Management
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Solution Overview
Problem
Multilayer ceramic capacitors face challenges in maintaining insulation resistance between outer electrodes due to the displacement of electrode paste application, which can reduce the distance between outer electrodes and increase equivalent series inductance (ESL), compromising performance in high-frequency, low-voltage, and low-power electronic devices.
Innovation Solution
A three-terminal capacitor design is implemented with specific geometric configurations and conductor layer arrangements to maintain the distance between outer electrodes, ensuring stable insulation resistance and reduced ESL, even when the electrode paste position is displaced, by using center and side outer electrodes with defined lengths and widths, and conductor layers extending between them.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the distance between outer electrodes is decreased to reduce ESL, then the inductance is reduced, but the insulation resistance between outer electrodes is likely to be reduced
Solution Approach 1:
The patent divides the capacitor into three separate terminals (first outer electrode, center outer electrode, second outer electrode) instead of using only two outer electrodes. This segmentation allows the first and second outer electrodes to be positioned closer together for reduced ESL, while the center outer electrode provides additional insulation pathways that maintain high insulation resistance between the outer electrodes.
2Manufacturing precision
If the position at which paste for forming outer electrode is applied is displaced, then the distance between outer electrodes is decreased, but the insulation resistance is reduced
Solution Approach 1:
The patent incorporates a center outer electrode as a compensatory measure during the design stage. This center electrode creates additional insulation barriers between the first and second outer electrodes, providing a cushion against the potential insulation resistance reduction that would occur if paste application position is displaced during manufacturing.
3Reliability
If the distance between outer electrodes is maintained to ensure insulation resistance, then the path through which current flows is increased, but the ESL is increased
Solution Approach 1:
The patent introduces a third terminal (center outer electrode) that extends in the width direction, creating a new dimensional approach to the insulation problem. This allows the first and second outer electrodes to be positioned closer in the length direction for reduced ESL, while the center electrode provides insulation coverage across the width direction, effectively solving both requirements simultaneously through dimensional diversification.
Data Source
AI summary
A length of a first-side outer electrode is E1, a length of a second-side outer electrode is E3, a length of a center outer electrode is E2, a distance between the first-side outer electrode and the center outer electrode is ME1, a distance between the center outer electrode and the second-side outer electrode is ME2, a length of a capacitor element is L, a width from an edge of the first side second extending portion closer to a third surface to the third surface is M1L, a width from an edge of the first side second extending portion closer to a fourth surface to an edge of the first-side outer electrode on a first surface is M1R, a width from an edge of the first extending portion closer to the third surface to an edge of the center outer electrode on the first surface closer to the third surface is M2L, and a width from an edge of the first extending portion closer to the fourth surface to an edge of the center outer electrode on the first surface closer to the fourth surface is M2R, such that E1+ME1+E2+ME2+E3>L, |ME1−ME2|<50 μm, M2L<M2R, and M1R>M1L are satisfied.