Multilayer Capacitor Floating Electrode Layout for Withstand Voltage
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Multilayer capacitors used in power driving systems for electric vehicles face reliability issues when increasing withstand voltage, particularly due to the method of voltage division using a floating electrode.
Innovation Solution
A multilayer capacitor design incorporating a capacitor body with stacked dielectric layers and internal electrodes, where floating electrodes are strategically positioned to enhance voltage division while maintaining reliability, with specific ratios of electrode distances and capacitor body dimensions optimized for improved performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If voltage division using a floating electrode is implemented to increase withstand voltage, then withstand voltage characteristics are improved, but reliability is deteriorated
Solution Approach 1:
The patent applies parameter changes by optimizing the distance ratios between floating electrodes and internal electrodes (a/L ≥ 0.113, b/L ≥ 0.09, c/W ≥ 0.138). These specific parameter ranges ensure that the floating electrodes effectively divide voltage to increase withstand voltage while maintaining sufficient spacing to prevent breakdown and maintain reliability.
Solution Approach 2:
The floating electrodes act as intermediaries between the internal electrodes and external electrodes. They mediate the voltage distribution by being positioned at specific distances from the internal electrodes, thereby dividing the voltage stress and improving withstand voltage characteristics while maintaining reliability through proper spacing.
2Strength
If floating electrodes are added to divide voltage, then withstand voltage increases, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the voltage distribution function into multiple segments handled by floating electrodes positioned at different locations. The capacitor body is segmented into multiple regions with floating electrodes at specific distances (a, b, c) from internal electrodes, allowing voltage division across multiple zones to increase overall withstand voltage.
Solution Approach 2:
The patent introduces another dimension by positioning floating electrodes not only in the stacking direction (distance a) but also at distances from side surfaces (distance b and c). This multi-dimensional positioning optimizes voltage division while managing the complexity of the electrode structure.
Data Source
AI summary
A multilayer capacitor includes a capacitor body having first to sixth surfaces, including a plurality of first and second dielectric layers and a plurality of internal electrodes stacked; and first and second external electrodes. The internal electrode includes first and second internal electrodes, a first floating electrode disposed between the first and second internal electrodes on the first dielectric layer, and second and third floating electrodes disposed on the second dielectric layer. The second floating electrode overlaps a portion of the first internal electrode and a portion of the first floating electrode, and the third floating electrode overlaps a portion of the second internal electrode and a portion of the first floating electrode. a/L is 0.113 or more, in which L is a length of the capacitor body, and a is a distance between the first floating electrode and the first or second internal electrodes.