Planar Inductor with Asymmetric Electrodes for Low Resistance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The demand for reducing the size and resistance of inductors in electronic devices has not been adequately met by existing laminated chip inductors, which are limited by their multi-layered board structure.
Innovation Solution
An inductor design featuring a wire with specific dimensions and electrodes on the same plane, along with a magnetic layer and bumps, optimized to reduce size and resistance while ensuring high inductance and reliable electrical connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a laminated chip inductor with multiple-layered board is used, then the inductor structure is established, but the size reduction demand cannot be satisfied
Solution Approach 1:
The patent extracts the essential functional elements (wire, electrodes, magnetic layer) from the complex multi-layered board structure and arranges them on a single plane, eliminating unnecessary structural complexity while maintaining inductor functionality
Solution Approach 2:
The patent transitions from a three-dimensional multi-layered stacked structure to a two-dimensional planar arrangement, reorganizing components on the same plane to reduce overall volume while maintaining electrical connectivity and magnetic coupling
2Loss of energy
If a laminated chip inductor is used, then the inductor structure is established, but the resistance reduction demand cannot be satisfied
Solution Approach 1:
The patent performs preliminary actions by ensuring sufficient electrode areas (S1 and S2 both ≥ W²) and optimizing their positions before final assembly, which reduces contact resistance and current density at connection points, thereby reducing overall energy loss
Solution Approach 2:
The patent changes critical parameters including electrode area (≥ W²), wire width (W), and area aspect ratio (X/Y ≥ 1.5) to optimize electrical performance, specifically reducing resistance and energy loss while maintaining structural feasibility
3Loss of energy
If the electrode areas are increased to reduce resistance, then the resistance decreases, but the device size increases
Solution Approach 1:
The patent optimizes the relationship between wire width (W), electrode areas (S1, S2 ≥ W²), and area dimensions (X, Y) to achieve minimum resistance with minimum area, establishing parameter thresholds that balance electrical performance and compactness
Solution Approach 2:
The patent introduces asymmetry by requiring the area length X to be at least 1.5 times the length Y (X/Y ≥ 1.5), optimizing the aspect ratio to reduce resistance in the primary current flow direction while minimizing overall footprint
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 proposed inductor achieves a reduction in size and resistance while maintaining high inductance and improving electrical connection reliability, enabling efficient production and integration into electronic devices.
Implementation Method 1
a magnetic layer covering a one-side surface in a thickness direction of the wire
Data Source
AI summary
An inductor includes a wire having a width W, and a first electrode and a second electrode continuous to each of both ends of the wire. The wire, the first electrode, and the second electrode are present on the same plane. The plane area S1 of the first electrode and the plane area S2 of the second electrode are a square value (W2) or more of the width W. An area in which the wire is disposed is positioned between the first electrode and the second electrode. The area has a length X in a longitudinal direction equal to a length L between the first electrode and the second electrode along a facing direction of the first electrode and the second electrode, and a length Y in a short-length direction in a direction perpendicular to the longitudinal direction. The length X in the longitudinal direction is 1.5 times or more of the length Y in the short-length direction.