Multilayer Capacitor Series Electrode Detection

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Solution Overview

Problem

Multilayer capacitors in existing technologies face challenges in detecting issues such as short-circuiting and cracks after mounting, which can lead to a decrease in electrostatic capacitance and withstand voltage, making it difficult to identify problems post-assembly.

Innovation Solution

A multilayer capacitor design featuring internal electrodes connected in series through a connection conductor, allowing for the detection of issues by varying electrostatic capacitance and resistance values, with specific configurations to protect capacitance portions from cracks and ensure stable mounting on a circuit substrate.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If capacitor components are connected in series to improve withstand voltage, then withstand voltage property is improved, but detection capability of problems after mounting deteriorates

Engineering Contradiction:

Improvewithstand voltage propertyVSAvoiddetection capability of problems

Core Design Contradiction:

StrengthVSDifficulty of detecting and measuring

Solution Approach 1:

The capacitor is divided into multiple independent capacitance portions (first capacitance portion with first internal electrode, second capacitance portion with second internal electrode, etc.) that are connected in series. Each capacitance portion can be independently detected through its external electrodes, enabling problem detection while maintaining series connection for improved withstand voltage.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

External electrodes are introduced as intermediary elements that provide access to each capacitance portion. The first external electrode connects to the first internal electrode, the second external electrode connects to the second internal electrode, and so on, allowing external measurement and detection of each segment without disrupting the series connection structure.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Difficulty of detecting and measuring

If internal electrodes are connected in series through connection conductor, then problem detection is enabled, but device complexity increases

Engineering Contradiction:

Improveproblem detection capabilityVSAvoidinternal electrode connection structure

Core Design Contradiction:

Difficulty of detecting and measuringVSDevice complexity

Solution Approach 1:

Multiple internal electrodes (first internal electrode, second internal electrode, third internal electrode) are merged into a single integrated capacitor structure where they are connected in series through a connection conductor formed within the same element assembly. This combining approach enables problem detection functionality without requiring separate discrete components, thus limiting the increase in device complexity.

Inventive Principle:

Principle #5Merging (Combining)

3Reliability

If capacitance portions are positioned at different locations in element assembly, then protection from cracks is improved, but manufacturing precision requirements increase

Engineering Contradiction:

Improveprotection from cracksVSAvoidpositioning precision of internal electrodes

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

Different capacitance portions are positioned at different locations within the element assembly (first capacitance portion at one location, second capacitance portion at another location). This local distribution strategy ensures that if cracks occur in one region, other capacitance portions remain intact and functional, improving reliability while using the inherent spatial structure of the element assembly.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS10847314B2Multilayer capacitor and electronic component device

Publication Date: 2020.11.24 TDK CORP

AI summary

A multilayer capacitor includes an element assembly, a first external electrode, a second external electrode, and a plurality of internal electrodes which are disposed at the inside of the element assembly. The plurality of internal electrodes include a first internal electrode that is electrically connected to the first external electrode, a second internal electrode that is electrically connected to the second external electrode, and a plurality of third internal electrodes. The plurality of third internal electrodes are electrically connected to each other by a first connection conductor and a second connection conductor, a first capacitance portion is constituted by the first internal electrode and the third internal electrodes, a second capacitance portion is constituted by the second internal electrode and the third internal electrodes, and the first capacitance portion and the second capacitance portion are electrically connected in series.