Power Inductor Coil Layout for DC Resistance and Saturation Current
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The miniaturization of power inductors for mobile devices requires increasing the line width or thickness of coils to improve direct current resistance, but this leads to a trade-off with saturation current characteristics, resulting in rapid deterioration when the core size or magnetic cover thickness is reduced.
Innovation Solution
A coil component design with varying line widths, where the maximum line width at corner portions is between 1.05 and 1.20 times the minimum line width of connection portions, optimizing direct current resistance without significant deterioration of saturation current characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the line width or thickness of the coil is increased to improve direct current resistance, then the direct current resistance value is improved, but the saturation current characteristics deteriorate rapidly
Solution Approach 1:
The coil line width is varied locally: corner portions have a maximum line width (Dmax) while connection portions have a minimum line width (dmin), creating local quality differences that optimize both DC resistance and saturation current characteristics simultaneously
Solution Approach 2:
The line width parameter of the coil is changed from a constant value to a variable value, with the ratio Dmax/dmin controlled between 1.05-1.20, allowing optimization of electrical characteristics without compromising structural integrity
2Volume of moving object
If the core size is reduced or magnetic cover thickness is lowered to improve miniaturization, then the component size is reduced, but the saturation current characteristics deteriorate
Solution Approach 1:
The magnetic cover thickness is varied locally, being thinner at corner portions and thicker at connection portions, allowing miniaturization while maintaining saturation current characteristics through strategic thickness distribution
Solution Approach 2:
The solution moves from a uniform one-dimensional thickness parameter to a two-dimensional variable thickness parameter across the magnetic cover, enabling size reduction without sacrificing performance
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 design enhances direct current resistance while maintaining satisfactory saturation current characteristics, as demonstrated by improved inductance and saturation current values in experimental samples.
Implementation Method 1
An inductor, a coil component, is a representative passive device configured to remove noise by forming an electronic circuit with a resistor and a capacitor, and is used for a configuration of a resonance circuit and a filter circuit which amplify signals of specific frequency bands in combination with capacitors using electromagnetic properties.
Data Source
AI summary
A coil component includes: a body including a plurality of corners formed by side surfaces of the body adjacent to each other; a coil disposed in the body, and including one or more turns on a central axis, substantially parallel to the first direction; and an external electrode disposed on a surface of the body and connected to the coil, wherein an outermost turn of the coil includes a plurality of corner portions adjacent to the plurality of corners of the body, and at least one connection portion connecting the plurality of corner portions and adjacent to the side surface of the body, and when a maximum value of a line width in at least one of the plurality of corner portions is referred to as Dmax, and a minimum value of a line width in the at least one connection portion is referred to as dmin, 1.05 dmin≤Dmax≤1.20 dmin is satisfied.