Multilayer Capacitor Array ESR Control via Segmented Electrode Connections
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional multilayer capacitor arrays face challenges in achieving sufficient equivalent series resistance (ESR) and suffer from stress concentration due to electrostriction, which can lead to cracking, especially as the number of laminated layers increases to enhance capacitance.
Innovation Solution
A multilayer capacitor array design where internal electrodes in the ESR control section are connected to terminal and external electrodes in series, while those in the capacitance section are connected only to terminal conductors, allowing for higher ESR and distributing electrostriction stress across the laminate, thereby preventing cracking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If internal electrodes are connected in parallel through lead conductor to external electrodes, then the multilayer capacitor array can be manufactured with conventional structure, but the equivalent series resistance (ESR) is insufficient
Solution Approach 1:
The capacitor array is divided into multiple capacitor element portions with distinct ESR control sections and capacitance sections. The ESR control sections contain internal electrodes connected in parallel to external electrodes, while capacitance sections contain internal electrodes connected only to terminal conductors. This segmentation allows different regions to serve different functions: ESR control and capacitance accumulation, respectively.
Solution Approach 2:
Different connection configurations are applied to different local regions of the capacitor array. The ESR control sections have internal electrodes connected to both terminal conductors and external electrodes, creating a specific local electrical characteristic. The capacitance sections have internal electrodes connected only to terminal conductors, creating a different local characteristic. This local quality differentiation enables simultaneous optimization of ESR and capacitance.
2Quantity of substance
If the number of laminated layers is increased to increase capacitance, then the capacitance of the multilayer capacitor array increases, but stress concentration due to electrostriction increases leading to cracking
Solution Approach 1:
The laminate is segmented into ESR control sections and capacitance sections with different internal electrode connection patterns. This segmentation allows the capacitance to be increased by adding more laminated layers in the capacitance sections without proportionally increasing stress concentration, as the ESR control sections provide stress relief pathways.
Solution Approach 2:
The ESR control sections act as intermediary regions that mediate between the capacitance accumulation in the capacitance sections and the external circuit. These intermediary sections provide stress relief through their specific connection configuration, preventing stress concentration from propagating through the entire laminate structure.
3Strength
If internal electrodes of the same polarity are aligned at boundaries between capacitor element portions, then electrostriction stress is distributed across the laminate, but the proximity of same-polarity internal electrodes may affect capacitance
Solution Approach 1:
The capacitor array is segmented into distinct ESR control sections and capacitance sections. The alignment of internal electrodes of the same polarity at boundaries occurs specifically in the ESR control sections, where it serves to distribute electrostriction stress. The capacitance sections are designed to maintain proper electrode spacing and alignment for stable capacitance, thus the stress distribution benefit does not compromise capacitance stability.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration effectively increases ESR, reduces stress concentration, and maintains capacitance stability by aligning internal electrodes of the same polarity at boundaries, ensuring the capacitor array operates with improved impedance and bandwidth without capacitance fluctuations.
Implementation Method 1
electrostriction occurs locally in portions where the internal electrodes overlap, with application of a voltage from the outside
Data Source
AI summary
A multilayer capacitor array achieves a high ESR because terminal conductors to which internal electrodes in capacitance sections are connected in parallel are connected in series through internal electrodes in ESR control sections to external electrodes. Since in the multilayer capacitor array the internal electrodes extend as far as a boundary between capacitor element portions, electrostriction occurs in an entire laminate including a region near the boundary between the capacitor element portions, with application of a voltage from the outside. Therefore, concentration of stress due to electrostriction is avoided, so as to suppress occurrence of cracking or the like.