Composite Electronic Component with Shared Terminal Electrode
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Multilayer ceramic capacitors have unfavorable DC-bias properties and are infeasible for high capacitance, while tantalum capacitors have high equivalent series resistance (ESR) and generate acoustic noise when mounted on a board.
Innovation Solution
A composite electronic component combining a multilayer ceramic capacitor and a tantalum capacitor, where the internal electrodes of the ceramic capacitor are led to the lower portion of the ceramic body to reduce the current loop size and equivalent series inductance (ESL), and the capacitors are mounted on an insulating sheet to minimize acoustic noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multilayer ceramic capacitors are used, then equivalent series resistance (ESR) and equivalent series inductance (ESL) levels are low, but DC-bias properties are unfavorable and high capacitance cannot be implemented
Solution Approach 1:
The patent combines a multilayer ceramic capacitor and a tantalum capacitor into a single composite electronic component with a shared terminal electrode structure. The MLCC provides low ESR and ESL, while the tantalum capacitor provides high capacitance and good DC-bias properties, achieving synergistic performance that neither capacitor could achieve alone.
2Quantity of substance
If tantalum capacitors are used, then high capacitance and superior DC-bias properties are achieved, but equivalent series resistance (ESR) is high
Solution Approach 1:
The composite structure merges the advantages of both capacitor types: the tantalum capacitor contributes high capacitance and excellent DC-bias characteristics, while the MLCC contributes low ESR. The shared terminal electrode design further optimizes the current path to minimize inductance and enhance overall reliability.
3Volume of moving object
If multilayer ceramic capacitors are directly mounted on a board, then compact installation is achieved, but acoustic noise occurs
Solution Approach 1:
The patent introduces a terminal electrode structure that serves as an intermediary between the capacitors and the board. This shared terminal electrode acts as a mechanical buffer and acoustic isolation element, preventing direct contact between the MLCC and board that would generate acoustic noise, while still maintaining compact installation.
4Reliability
If internal electrodes are led to the lower portion of the ceramic body, then current loop size is reduced and equivalent series inductance (ESL) is reduced, but manufacturing complexity increases
Solution Approach 1:
Instead of leading internal electrodes to the conventional upper external electrodes, the patent inverts the connection path by leading them directly to the lower terminal electrode. This reverse configuration shortens the current loop and reduces ESL, while the shared terminal electrode structure simplifies the overall manufacturing process.
Data Source
AI summary
A composite electronic component includes a multilayer ceramic capacitor including a ceramic body in which dielectric layers and internal electrodes are alternately disposed, and first and second external electrodes disposed on a lower surface of the ceramic body; a tantalum capacitor including a body portion containing a sintered material of a tantalum powder and a tantalum wire having a portion embedded in the body portion, and disposed on the multilayer ceramic capacitor; and an encapsulant part enclosing the tantalum capacitor and the multilayer ceramic capacitor, wherein the internal electrodes are led to the lower surface of the ceramic body.