Stacked Resonant Filter Capacitor Layout for Lower ESL
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Solution Overview
Problem
Conventional filter circuits require a large number of capacitors to meet specification requirements, leading to inefficiencies.
Innovation Solution
A filter circuit incorporating a resonant circuit with a stacked electrolytic capacitor configuration, where two internal capacitors are connected in series, reducing equivalent series inductance (ESL) by alternating the current directions through each capacitor element, thereby minimizing the number of capacitors needed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple capacitors are used to meet specification requirements, then capacitance increases, but device complexity and quantity of components increase
Solution Approach 1:
The patent combines multiple capacitor elements into a single integrated capacitor structure. Specifically, multiple capacitor elements are stacked and connected in series within one capacitor housing, achieving the required total capacitance while reducing the number of discrete capacitor components from multiple separate capacitors to just one integrated unit.
Solution Approach 2:
The patent segments the capacitor into multiple internal capacitor elements that are stacked and connected in series. Each capacitor element contributes to the total capacitance, and by segmenting the capacitor this way, the design achieves high capacitance values while maintaining a compact single-component structure rather than requiring multiple separate capacitors.
2Reliability
If conventional capacitor configurations are used, then capacitance can be achieved, but equivalent series inductance (ESL) remains high
Solution Approach 1:
The capacitor is segmented into multiple capacitor elements connected in series, where each element has its own terminals. This segmentation allows the current to flow through multiple paths simultaneously, effectively reducing the equivalent series inductance by distributing the current flow across parallel internal paths while maintaining the series connection for capacitance accumulation.
Solution Approach 2:
The patent transitions from a conventional single-path current flow to a multi-dimensional current distribution by stacking capacitor elements vertically. The current flows through multiple parallel paths in the vertical dimension, reducing ESL by creating multiple current loops that cancel each other's magnetic fields, while the series connection maintains the required capacitance.
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 configuration effectively reduces ESL and increases capacitance, allowing for a more compact and efficient filter circuit design with fewer capacitors.
Implementation Method 1
a capacitor (11) electrically connecting between the inductance element (42) and a conductor (W3) having a reference potential
Implementation Method 2
a resonant circuit (101) including an inductance element (42) and a capacitor (11)
Data Source
AI summary
A filter circuit includes a resonant circuit, and the resonant circuit includes an inductance element and a capacitor. The capacitor includes an element stacked body, an exterior body, a first external electrode and a second external electrode, and a third external electrode. The element stacked body is formed as a stack of a plurality of capacitor elements. In a first capacitor element, a first end portion is electrically connected to the first external electrode. In a second capacitor element, a first end portion is electrically connected to the second external electrode. A third external electrode is electrically connected to a cathode part of the capacitor elements.