Multilayer Capacitor Alternating Terminal Electrodes
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Solution Overview
Problem
Multilayer capacitors used in power circuits face challenges in lowering equivalent series inductance and impedance over a wide frequency band, limiting their effectiveness in noise elimination.
Innovation Solution
A multilayer capacitor design featuring two capacitor portions with different capacitances and terminal electrodes of alternating polarities, connected through lead conductors, which reduces equivalent series inductance by canceling out magnetic fields caused by opposing currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If terminal electrodes are arranged on only two opposing side faces of a rectangular parallelepiped multilayer body, then the structure is simple, but the equivalent series inductance cannot be sufficiently lowered
Solution Approach 1:
The invention divides the terminal electrode arrangement into multiple groups (first terminal electrode group and second terminal electrode group) with different polarities, where each group is arranged on different side faces. This segmentation allows opposite polarity terminals to be positioned adjacently, enabling magnetic field cancellation and reducing equivalent series inductance while maintaining structural simplicity.
2Device complexity
If a single capacitor portion is used, then the structure is simple, but the impedance cannot be lowered over a wide frequency band
Solution Approach 1:
The invention divides the capacitor into multiple capacitor portions (first capacitor portion and second capacitor portion) with different capacitance values. Each portion resonates at different frequencies, and their combined effect lowers impedance across a wide frequency band. The segmentation of capacitor portions enables broad-spectrum noise elimination while maintaining a relatively simple integrated structure.
3Ease of manufacture
If terminal electrodes of the same polarity are arranged adjacently, then the connection is simple, but the magnetic fields do not cancel and equivalent series inductance remains high
Solution Approach 1:
The invention employs asymmetric arrangement of terminal electrodes by grouping them according to polarity (first terminal electrode group with positive polarity and second terminal electrode group with negative polarity). This asymmetric grouping ensures that opposite polarity terminals are positioned adjacently, creating opposing current directions that generate canceling magnetic fields, thereby reducing equivalent series inductance while simplifying the connection structure.
4Device complexity
If lead conductors are arranged without considering polarity alternation, then the layout is simple, but the magnetic fields add up instead of canceling
Solution Approach 1:
The invention implements an asymmetric layout strategy for lead conductors by routing them according to terminal electrode polarity groups. Lead conductors connecting to opposite polarity terminals are positioned adjacently, ensuring that currents flow in opposite directions and generate canceling magnetic fields. This asymmetric routing achieves low equivalent series inductance without significantly increasing layout complexity.
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 low impedance over a wide frequency band while reducing equivalent series inductance, effectively addressing the limitations of existing multilayer capacitors.
Implementation Method 1
forming a multilayer body with terminal electrodes such that those having different polarities are alternately arranged can reduce the equivalent series inductance
Data Source
AI summary
A multilayer capacitor comprises a multilayer body in which a plurality of dielectric layers and a plurality of first to fourth inner electrodes are alternately arranged, and first to fourth terminal electrodes formed on side faces of the multilayer body. The multilayer capacitor has a first capacitor portion including first and second inner electrodes, and a second capacitor portion including third and fourth inner electrodes and exhibiting a capacitance different from that of the first capacitor portion. The first inner electrodes are electrically connected to respective ones of the plurality of first terminal electrodes through lead conductors, whereas the second inner electrodes are electrically connected to respective ones of the plurality of second terminal electrodes through lead conductors. The third and fourth inner electrodes are electrically connected to the third and fourth terminal electrodes through lead conductors, respectively. Any of the first and third terminal electrodes and any of the second and fourth terminal electrodes are arranged alternately on side faces of the multilayer body in a direction circulating along the side faces of the multilayer body.