BaTi1-yZryO3 MLCC Capacitance Anomaly for High Power
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Solution Overview
Problem
Existing ceramic multi-layer capacitors lack improved properties for high-power applications, particularly in terms of temperature-dependent capacitance anomalies and electrical performance.
Innovation Solution
A ceramic multi-layer capacitor design featuring BaTi1-yZryO3 ceramic layers with specific doping and electrode configurations, including a 'hammer design' for electrode layers, to optimize capacitance and electrical properties within a defined temperature range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional ceramic materials are used in multi-layer capacitors, then manufacturing is easier and structure is simpler, but temperature-dependent capacitance anomalies are not improved and electrical performance for high-power applications is insufficient
Solution Approach 1:
The patent changes the chemical composition parameters of the ceramic material by using BaTi(1-y)ZryO3 with specific doping elements (Nb, Ta, W, Mo) at controlled concentrations (0.01-0.10 atomic ratio for Zr, 0.001-0.05 for dopants). This parameter optimization resolves the contradiction by achieving superior electrical performance (low ESR, high breakdown voltage) while maintaining manufacturability through controlled sintering processes.
Solution Approach 2:
The patent employs composite ceramic materials combining BaTi(1-y)ZryO3 base material with multiple doping elements (Nb, Ta, W, Mo) and optional secondary phases. This composite approach achieves enhanced electrical properties (capacitance stability, low loss) necessary for high-power applications while the layered structure maintains relative manufacturing simplicity.
2Use of energy by moving object
If capacitance is increased for high-power applications, then energy density improves, but temperature-dependent capacitance anomalies worsen
Solution Approach 1:
The patent optimizes the compositional parameters of BaTi(1-y)ZryO3 by controlling the Zr content (0.01-0.10 atomic ratio) and adding specific dopants (Nb, Ta, W, Mo at 0.001-0.05 atomic ratio). This parameter tuning achieves high energy density through increased capacitance while simultaneously suppressing temperature-dependent anomalies by stabilizing the perovskite structure across the operating temperature range.
Solution Approach 2:
The patent introduces local compositional variations through doping elements distributed within the BaTi(1-y)ZryO3 lattice. These localized modifications create regions with enhanced dielectric properties and thermal stability, allowing high energy density storage while maintaining capacitance stability across temperature variations in high-power converter applications.
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 achieves a pronounced capacitance anomaly within the operating temperature range, offering high capacitance, energy density, breakdown voltage, low ESR, and low ESL, enhancing performance in high-power applications.
Implementation Method 1
The ceramic layers (2) comprise a ceramic material on the basis of BaTi1-yZryO3 where 0<y<1, wherein the ceramic material has a pronounced anomaly of the capacitance depending on the temperature
Implementation Method 2
the ceramic layers and the electrode layers arranged therebetween form a sintering body that can be produced by the sintering of ceramic green sheets
Data Source
AI summary
A ceramic multi-layer capacitor is disclosed. In an embodiment, the capacitor includes a main body having ceramic layers and first and second electrode layers arranged therebetween, wherein the ceramic layers includes a ceramic material on the basis of BaTi1-yZryO3 where 0≦y≦1, which has a temperature-dependent capacitance anomaly.