Composite Dielectric Capacitor for Heat-Stable High Capacitance
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Solution Overview
Problem
Stacked capacitors with thinner dielectric layers exhibit unstable insulation and reduced reliability due to heat generation under continuous voltage, leading to shorter high-temperature operating life.
Innovation Solution
Incorporating oxide grains with higher thermal conductivity, such as magnesium, rare earth elements, and manganese as single elements into dielectric layers, which improve heat dissipation and maintain high capacitance, while maintaining similar grain sizes to the barium titanate crystal grains for increased contact area and thermal conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the dielectric layer thickness is reduced to increase capacitance, then the capacitance increases, but the insulation stability deteriorates and reliability decreases due to heat generation
Solution Approach 1:
The dielectric layer is formed as a composite material containing barium titanate crystal grains (providing high capacitance) and oxide grains of magnesium, rare earth elements, or manganese (providing high thermal conductivity). This composite structure enables simultaneous achievement of high capacitance and improved heat dissipation, resolving the contradiction between increasing capacitance and maintaining insulation stability.
Solution Approach 2:
The oxide grains are distributed locally within the dielectric layer to create regions of high thermal conductivity. These localized high-conductivity regions facilitate efficient heat dissipation from critical areas, allowing the thin dielectric layer to maintain insulation stability while achieving high capacitance.
2Quantity of substance
If the dielectric layer thickness is reduced to increase capacitance, then the capacitance increases, but the high-temperature operating life decreases due to heat generation
Solution Approach 1:
The composite dielectric layer combines barium titanate for high capacitance with thermally conductive oxide grains (magnesium oxide, rare earth oxides, or manganese oxide) for superior heat dissipation. This composite structure enables the capacitor to maintain high capacitance while extending high-temperature operating life through enhanced thermal management.
Solution Approach 2:
The heat generated in the dielectric layer, which normally degrades performance and reduces operating life, is converted into a beneficial effect through the high thermal conductivity oxide grains. These grains act as heat sinks, efficiently conducting heat away from the dielectric layer and transforming the harmful thermal energy into useful heat dissipation that extends operating life.
3Temperature
If oxide grains are added to improve thermal conductivity, then heat dissipation improves, but the device complexity increases
Solution Approach 1:
The invention controls the oxide grain content within specific ranges (0.1-10 wt% of total dielectric layer weight) and maintains oxide grain sizes comparable to barium titanate crystal grains (0.5-5 μm). By optimizing these parameters, the dielectric layer achieves enhanced thermal conductivity while minimizing the increase in device complexity and maintaining manufacturability.
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 capacitors with these modifications demonstrate enhanced heat dissipation, reduced temperature rise under continuous DC voltage, and extended high-temperature operating life without compromising capacitance.
Implementation Method 1
The plurality of dielectric layers include oxide grains comprising at least one of the magnesium, the rare earth element, or the manganese as a single element
Data Source
AI summary
A capacitor includes a capacitor body including a plurality of dielectric layers and a plurality of internal electrode layers being stacked alternately. The plurality of dielectric layers mainly include crystal grains containing barium titanate as a main component. The plurality of dielectric layers contain magnesium, a rare earth element, and manganese. The plurality of dielectric layers include oxide grains containing at least one of the magnesium, the rare earth element, or the manganese as a single element.