Laminate Capacitor Structure to Isolate Voltage From Insulating Layers
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Solution Overview
Problem
Conventional multilayer capacitors experience a decrease in dielectric strength due to voltage being applied to both dielectric and insulating films, limiting their performance in power conversion devices.
Innovation Solution
A multilayer capacitor design featuring a stacked body with alternating laminate sections and insulating layers, where each laminate section includes conductors and a dielectric member, with the conductors spaced apart to minimize voltage application to insulating layers, thereby enhancing dielectric strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If voltage is applied to both dielectric films and insulating films in conventional multilayer capacitors, then the capacitor structure is simple and easy to manufacture, but the dielectric strength decreases because it is limited by the lower dielectric strength of the insulating films
Solution Approach 1:
The capacitor is divided into multiple laminate sections stacked in the thickness direction, with each section containing conductors and dielectric members arranged to create distinct voltage application zones. Insulating layers are placed between adjacent laminate sections to isolate voltage stress, allowing the dielectric members to withstand higher voltages without being limited by the lower dielectric strength of insulating films.
Solution Approach 2:
Different regions of the capacitor are assigned different functional qualities: dielectric members in laminate sections are designed to withstand high voltage, while insulating layers between sections handle isolation functions. This localized optimization allows each component to perform its specific function at its optimal performance level, maximizing overall dielectric strength.
2Quantity of substance
If conductors are placed close together to increase capacitance density, then the capacitor size is reduced, but the risk of breakdown increases due to higher voltage stress on insulating layers
Solution Approach 1:
The capacitor structure transitions from a two-dimensional planar arrangement to a three-dimensional stacked configuration with laminate sections arranged in the thickness direction. This vertical stacking allows conductors to be positioned close together in the plane for high density while maintaining adequate insulation distance in the vertical direction through insulating layers, effectively decoupling the density and reliability constraints.
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 suppresses the decrease in dielectric strength by ensuring that voltage is primarily applied to the dielectric layers, reducing the risk of breakdown and improving the capacitor's performance in power conversion devices.
Implementation Method 1
The dielectric member has a first surface and a second surface spaced apart from each other in the second direction. At least the first conductor is in contact with the first surface, and at least the first part is in contact with the second surface.
Implementation Method 2
Each of the insulating layers has a lower dielectric withstanding voltage than the dielectric member of each laminate section.
Data Source
AI summary
A multilayer capacitor includes a stacked body, a first external electrode, and a second external electrode. The stacked body includes a plurality of laminate sections and a plurality of insulating layers arranged alternately in z direction. Each laminate section includes a first conductor, a second conductor, a third conductor, and a dielectric member. The first conductor connects to the first external electrode, and the second conductor connects to the second external electrode. The third conductor includes a first part and a second part. The dielectric member has a first surface and a second surface spaced apart from each other in the z direction. The first surface is in contact with at least the first conductor, and the second surface is in contact with at least the first part. The laminate sections include two adjacent laminate sections in the z direction, and the first surfaces or the second surfaces of these two laminate sections face each other in the z direction.