Coil Component External Electrode Segmentation for Q-Value
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Solution Overview
Problem
Inductors with external electrodes extending from the mounting face to the top face via the end faces have lower Q-values due to parasitic capacitance and mounting strength issues.
Innovation Solution
A coil component design with a spiral coil conductor and external electrodes extending from the bottom face to the top face via the end faces, where at least one end of the coil conductor is connected to the external electrodes at the top face via lead conductors, reducing parasitic capacitance and improving magnetic coupling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If external electrodes extend from the mounting face to the top face via the end faces, then mounting strength is improved, but Q-value decreases due to increased parasitic capacitance
Solution Approach 1:
The external electrode is segmented into multiple sections: a first section extending from the mounting face to the end face, a second section extending from the end face to the top face, and a third section extending from the top face. This segmentation allows different portions of the electrode to serve different functions, reducing parasitic capacitance in critical areas while maintaining mounting strength through the extended structure.
Solution Approach 2:
Different sections of the external electrode have different cross-sectional areas and positions optimized for their specific functions. The first section has a larger cross-sectional area for mounting strength, while the third section extending from the top face has optimized dimensions to minimize parasitic capacitance. This local optimization resolves the contradiction between strength and energy loss.
2Loss of energy
If external electrodes have small surface areas, then Q-value is improved by reducing parasitic capacitance, but mounting strength decreases
Solution Approach 1:
The external electrode extends in the vertical dimension from the mounting face through the end face to the top face of the insulative body. This three-dimensional configuration allows the electrode to provide adequate mounting surface area without increasing parasitic capacitance in the horizontal plane, as the additional surface area is achieved through vertical extension rather than horizontal expansion.
3Strength
If coil conductor is electrically connected to external electrodes at the end faces, then mounting strength is improved, but Q-value decreases
Solution Approach 1:
The lead conductor serves as an intermediary element that connects the coil conductor to the external electrode at the top face rather than directly at the end face. This intermediary connection path reduces parasitic capacitance by separating the coil conductor from the high-capacitance region near the mounting face, while still providing secure mounting through the extended external electrode structure.
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 enhances the Q-value by minimizing parasitic capacitance and improving mounting strength through optimized electrical connections and magnetic field coupling.
Implementation Method 1
a coil conductor of spiral shape which is provided inside the element body part, which has a coil axis running roughly in parallel with a first face
Implementation Method 2
The design enhances the Q-value by minimizing parasitic capacitance and improving mounting strength through optimized electrical connections
Data Source
AI summary
In an embodiment, a coil component includes: an element body part 10; a coil conductor 36 constituted by first conductors 32 extending along the pair of end faces 16 and orthogonally to a bottom face 14, as well as second conductors 34 extending from one side, to the other side, of the pair of end faces and thereby connecting the multiple first conductors 32; lead conductor parts 38 electrically connected to two ends of the coil conductor, respectively; and a pair of external electrodes 50 electrically connected to the lead conductor parts; wherein at least one end of the coil conductor is electrically connected, via the lead conductor, to the external electrode at a top face 12 of the element body part; and the coil conductor extends from the at least the one end, using a second conductor, along and near the top face.