Alternating Element Stack Electrolytic Capacitor for Low ESL
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Solution Overview
Problem
Existing solid electrolytic capacitors face challenges in increasing capacitance due to space restrictions caused by anode comb terminals, which also limit the reduction of equivalent series inductance (ESL).
Innovation Solution
The design incorporates an element stack with alternating first and second capacitor elements, where the first end of each element is exposed and electrically connected to external electrodes, allowing for increased capacitance while maintaining low ESL by reducing magnetic flux.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If anode comb terminals are used to connect anode electrode parts, then electrical connection is achieved, but space for capacitor element is restricted
Solution Approach 1:
The patent removes the anode comb terminals from the capacitor structure and directly exposes the anode electrode parts (first ends) to the exterior. This extraction eliminates the space-consuming intermediate connection component while maintaining electrical connectivity, thereby resolving the contradiction between reliable electrical connection and available capacitor element space.
2Quantity of substance
If alternating capacitor elements are stacked, then capacitance is increased, but magnetic flux cancellation becomes complex
Solution Approach 1:
The patent divides the capacitor into multiple discrete capacitor elements (first and second elements) with opposite polarities that are stacked alternately. Each element is independently configured with exposed anode ends, creating a segmented structure that naturally cancels magnetic flux through alternating current directions while facilitating increased total capacitance through the combination of multiple elements.
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 achieves high capacitance while effectively reducing ESL, as the alternating current directions in the capacitor elements cancel out magnetic fields, thereby minimizing ESL.
Implementation Method 1
the alternating current directions in the capacitor elements cancel out magnetic fields, thereby minimizing ESL
Data Source
AI summary
An electrolytic capacitor including: an element stack including a plurality of capacitor elements; a package body sealing the element stack; and a first and second external electrode. Each of the capacitor elements includes a first end at which the anode body is exposed, and a second end covered with the cathode section, with at least an end surface of the first end exposed from the package body. The capacitor elements include a first capacitor element in which the first end faces a first surface of the package body, and a second capacitor element in which the first end faces a second surface different from the first surface of the package body. The first and second capacitor elements stacked alternately. The first end of the first capacitor element and the first end of the second capacitor element are electrically connected to the first external electrode and the second external electrode, respectively.