Multilayer Ceramic Capacitor Electrode Segmentation for Wideband Impedance Control
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Solution Overview
Problem
Multilayer ceramic capacitors (MLCCs) face challenges in effectively controlling impedance across a wide frequency band, particularly in power supply devices where voltage noise from rapid load current changes affects CPU performance, and existing designs struggle to reduce impedance uniformly.
Innovation Solution
A capacitor component with a layered structure comprising dielectric layers, alternating first and second internal electrodes, and external electrodes, divided into regions to create multiple resonance frequencies, allowing for reduced size and improved impedance control across a wide frequency band.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional MLCC structure with uniform internal electrodes is used, then the device is simple in structure and easy to manufacture, but the impedance cannot be controlled effectively across a wide frequency band
Solution Approach 1:
The internal electrodes are divided into multiple regions with different capacitance values (first region, second region, third region, etc.), creating multiple resonance frequencies. This segmentation allows the capacitor to maintain low impedance across a wider frequency band by providing multiple resonant peaks instead of a single resonance point, thereby resolving the contradiction between simple structure and wide frequency band impedance control.
Solution Approach 2:
Different regions of the internal electrodes are designed with different capacitance characteristics (different sizes, shapes, or dielectric layer configurations) to create localized variations in electrical properties. This local quality differentiation enables each region to contribute to impedance control at different frequencies, achieving wide band impedance control while maintaining a relatively simple overall structure.
2Reliability
If multiple decoupling capacitors are used to control impedance across wide frequency band, then the impedance control effectiveness is improved, but the device size and mounting space increase
Solution Approach 1:
Multiple capacitor functions (multiple resonance frequencies for wide band impedance control) are merged into a single MLCC device by creating multiple regions within the internal electrodes. This consolidation eliminates the need for multiple separate decoupling capacitors, thereby maintaining effective impedance control across the wide frequency band while significantly reducing the mounting space and number of components.
Solution Approach 2:
The single MLCC device is designed to perform multiple functions by incorporating internal electrode regions with different capacitance values that provide multiple resonance frequencies. This multi-functionality allows one capacitor to replace what would traditionally require multiple capacitors, achieving wide frequency band impedance control in a compact form factor.
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
The design effectively maintains low impedance in a wide frequency band, reducing the number of decoupling capacitors needed and minimizing mounting costs and space, while providing effective noise suppression in power supply devices.
Implementation Method 1
Each of the first internal electrode and the second internal electrode is divided into a plurality of regions to form capacitance with one or more internal electrodes adjacent thereto and having a polarity different therefrom
Implementation Method 2
The first internal electrode and the second internal electrode provide a plurality of resonance frequencies
Data Source
AI summary
A capacitor component includes a body including a plurality of dielectric layers having a layered structure and a first internal electrode and a second internal electrode alternately disposed with respective dielectric layers of the plurality of dielectric layers disposed therebetween. A first external electrode is disposed on a first surface and a second surface of the body opposing each other, and is connected to the first internal electrode. A second external electrode is disposed on at least one of a third surface and a fourth surface of the body connecting the first surface to the second surface and opposing each other, and is connected to the second internal electrode. The first internal electrode and the second internal electrode provide a plurality of resonance frequencies. In some examples, each of the first internal electrode and the second internal electrode is divided into a plurality of regions spaced apart from each other.