Multilayer Ceramic Capacitor ESR Control via Segmented Internal Conductors
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Solution Overview
Problem
Multilayer ceramic capacitors face challenges in controlling equivalent series resistance (ESR) while maintaining low equivalent series inductance (ESL), especially at high frequencies, due to limitations in materials and design, which affects their ability to provide stable power supply and impedance characteristics in compact electronic devices.
Innovation Solution
A multilayer ceramic capacitor design featuring a ceramic body with specific internal and external electrode configurations, including overlapping regions, and connection conductors to control ESR and ESL, allowing for precise adjustment of ESR characteristics and reduced impedance across a wide frequency band.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a material having high electrical resistance is used for external electrode and internal electrode to control ESR, then high ESR characteristics are provided, but localized heat spot is generated due to current channeling phenomenon
Solution Approach 1:
The patent applies local quality by making the internal connection conductor have different electrical resistance characteristics than the internal electrodes. Specifically, the internal connection conductor uses a material with lower electrical resistance (such as copper or copper alloy) compared to the internal electrodes, creating localized high-conductivity paths where needed to prevent current channeling and heat spots while maintaining overall ESR control through the electrode structure design
2Reliability
If a material having high electrical resistance is used for internal electrode to control ESR, then high ESR characteristics are provided, but internal electrode material needs to be continuously changed to match ceramic material
Solution Approach 1:
The patent segments the conductor system into three distinct parts with different material properties: internal electrodes (high resistance for ESR control), internal connection conductors (low resistance for stable connection), and external electrodes (standard material for mounting). This segmentation allows each component to be optimized independently, eliminating the need to continuously change internal electrode materials to match ceramic materials while maintaining reliable ESR characteristics
3Speed
If multilayer ceramic capacitor is designed for low ESL at high frequency, then low equivalent series inductance is achieved, but ESR control becomes difficult
Solution Approach 1:
The patent uses parameter changes by systematically varying the electrical resistance values of different conductor components (internal electrodes, internal connection conductors, external electrodes) to independently control ESR and ESL characteristics. By adjusting the resistance parameters of specific layers and connection paths, the capacitor achieves both low ESL for high-frequency operation and controlled ESR for stable power supply, resolving the trade-off between these two parameters
Data Source
AI summary
There is provided a multilayer ceramic capacitor including a ceramic body, first to third capacitor parts, first and second internal connection conductors, and first to fourth external electrodes, wherein the first capacitor part is connected in series with the second internal connection conductor, and the second capacitor part is connected in series with the first internal connection conductor.