Coil Component Slit Design for Leakage Current Reduction
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Solution Overview
Problem
Leakage current flowing along the surface of coil components in electronic devices poses a challenge, especially as devices become smaller and more high-performance, leading to inefficiencies and potential issues with voltage application.
Innovation Solution
A coil component design featuring a body with slit portions formed on its surfaces, where the slit width is less than or equal to 20.8% of the coil component's length, intersecting the direction of external electrodes, to increase the leakage path length and reduce surface leakage current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the coil component size is reduced to meet smaller electronic device requirements, then the device size is reduced, but leakage current increases due to shorter leakage paths
Solution Approach 1:
The patent introduces slit portions that divide the body into segmented regions, creating multiple leakage paths between external electrodes. This segmentation increases the effective leakage path length without increasing the overall component dimensions, thereby reducing leakage current while maintaining compact size.
Solution Approach 2:
The slit portions extend in the thickness direction (third direction) of the body, adding a vertical dimension to the leakage path. This dimensional change allows the leakage current to travel through a longer path in the thickness direction rather than only in the planar direction, effectively reducing leakage current in miniaturized components.
2Object-generated harmful factors
If slit portions are added to increase leakage path length, then leakage current is reduced, but the effective volume and inductance characteristics may be affected
Solution Approach 1:
The slit portions are strategically positioned at specific locations on the body surfaces rather than uniformly distributed. This local quality approach ensures that slits are placed where they most effectively increase leakage path length between external electrodes, while minimizing impact on the overall inductance characteristics and effective volume of the coil component.
Solution Approach 2:
The patent optimizes parameters such as the width, depth, and spacing of slit portions to achieve the desired balance between leakage current reduction and inductance maintenance. By carefully controlling these geometric parameters, the design achieves effective leakage current suppression while preserving the magnetic properties and inductance characteristics of the coil.
Data Source
AI summary
A coil component includes: a body having a first surface and a second surface opposing each other, and a first end surface and a second end surface connecting the first surface and the second surface to each other and opposing each other in a first direction; a coil unit disposed in the body; and first and second external electrodes disposed on the body, and respectively connected to the coil unit, wherein the coil component includes a slit portion formed in at least one of the first surface of the body and the second surface of the body, spaced apart from each of the first and second external electrodes, and extending in a direction intersecting the first direction, and a dimension Ws of the slit portion in the first direction is less than or equal to 20.8% of a dimension Lc of the coil component in the first direction.