Monolithic Ceramic Capacitor Internal Conductors for ESL and ESR Control
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Solution Overview
Problem
Monolithic ceramic capacitors with decreased equivalent series inductance (ESL) face challenges in stability due to low equivalent series resistance (ESR), leading to resonance and oscillation issues, and have complex capacitance determination processes and susceptibility to solder cracks that disrupt connectivity.
Innovation Solution
Incorporating same-polarity-electrode-connecting conductors that electrically connect multiple outer electrodes within the ceramic laminate, allowing for simplified capacitance measurement and ensuring capacitance even with solder cracks, while minimizing ESR and ESL through strategic conductor placement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Force
If multiple inner electrodes are used to decrease ESL, then ESL is reduced, but ESR decreases significantly causing resonance and oscillation
Solution Approach 1:
Multiple inner electrodes having the same polarity are electrically connected by conducting portions formed in the ceramic layers, merging them into a unified electrode structure. This allows the capacitor to achieve low ESL through multiple electrodes while maintaining stable ESR by preventing excessive parallel resistance reduction, thus resolving the contradiction between ESL reduction and ESR stability.
2Reliability
If each inner electrode connects to only one outer electrode, then ESR is maintained, but capacitance measurement becomes complex and solder cracks cause complete failure
Solution Approach 1:
Each outer electrode is electrically connected to multiple inner electrodes through conducting portions in the ceramic layers, creating a universal connection structure. This allows the capacitor to function reliably even when some connections fail (solder cracks), as alternative paths exist. It also simplifies capacitance measurement by providing multiple accessible terminals for testing, resolving both the reliability and complexity issues.
3Ease of manufacture
If same-polarity outer electrodes are not connected, then manufacturing is simpler, but capacitance measurement requires complex procedures
Solution Approach 1:
Conducting portions formed in the ceramic layers serve as intermediary connections between same-polarity outer electrodes and inner electrodes. These intermediaries provide direct measurement paths for capacitance testing without requiring complex external wiring or procedures, thus simplifying measurement while maintaining manufacturing simplicity.
Data Source
AI summary
A monolithic ceramic capacitor includes a first same-polarity-electrode-connecting conductor and a second same-polarity-electrode-connecting conductor that are provided inside a ceramic laminate. The first same-polarity-electrode-connecting conductor is electrically connected to all of the first outer electrodes, and the second same-polarity-electrode-connecting conductor is electrically connected to all of the second outer electrodes. Preferably, a plurality of first same-polarity-electrode-connecting conductors and a plurality of second same-polarity-electrode-connecting conductors are successively disposed in the laminating direction inside the ceramic laminate.