Multilayer Ceramic Capacitor With Internal Resistance Electrodes
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Solution Overview
Problem
The miniaturization and thinning of electronic components have led to increased high-frequency noise in internal circuits, necessitating the adjustment of equivalent series resistance (ESR) in multilayer ceramic capacitors to effectively address this issue.
Innovation Solution
A multilayer ceramic capacitor design featuring a ceramic body with dielectric layers, internal and external electrodes, and internal resistance electrodes, where the first and third external electrodes are electrically connected by internal resistance electrodes, allowing for adjustable resistance values to manage ESR effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If miniaturization and thinning of electronic components is pursued, then device size is reduced, but high-frequency noise increases
Solution Approach 1:
The patent changes the electrical parameters of the capacitor by introducing internal resistance electrodes with specific resistance values (1-100 ohms) to adjust the equivalent series resistance (ESR). This parameter modification allows the capacitor to effectively suppress high-frequency noise while maintaining the miniaturized form factor, resolving the contradiction between small size and noise suppression capability
2Object-affected harmful factors
If ESR is adjusted to reduce high-frequency noise, then noise suppression improves, but manufacturing complexity increases
Solution Approach 1:
The patent merges the resistance function directly into the capacitor structure by forming internal resistance electrodes within the ceramic body using screen printing technology. This integration combines the capacitor and resistor functions into a single component, reducing the number of separate parts and simplifying the overall circuit design while achieving noise suppression
Solution Approach 2:
The patent achieves different ESR values by modifying the resistance value of internal electrodes through changes in paste composition, electrode width, or electrode length, rather than designing completely different structural configurations. This parameter-based approach simplifies manufacturing by using a standardized structure with variable electrical characteristics
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 design enables easy realization of a desired ESR level, effectively reducing high-frequency noise and maintaining high capacitance, while ensuring reliability even in cases of short-circuit conditions.
Implementation Method 1
internal resistance electrodes disposed on the third dielectric layers and partially exposed to the upper surface of the ceramic body... the first and third external electrodes are electrically connected to each other by the internal resistance electrodes
Data Source
AI summary
A multilayer ceramic capacitor may include a ceramic body having first to third dielectric layers, first and third internal electrodes disposed to be partially exposed to an upper surface of the ceramic body, second and fourth internal electrodes disposed to be partially exposed to a lower surface of the ceramic body, internal resistance electrodes disposed on the third dielectric layers and partially exposed to the upper surface of the ceramic body, first and third external electrodes disposed on the ceramic body to be connected to the first and third internal electrodes, second and fourth external electrodes disposed to be connected to the second and fourth internal electrodes. The first and third external electrodes are electrically connected to each other by the internal resistance electrodes.