Coreless Planar Coil Rings for Magnetic Flux Containment
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Solution Overview
Problem
Coreless planar coils generate a large magnetic field distribution, causing crosstalk and efficiency issues due to the lack of a core to limit the magnetic field, affecting nearby electronic systems.
Innovation Solution
A coreless planar coil design incorporating a first metal ring around the coil body to produce a magnetic field opposite to the alternating field, with an optional second metal ring inside to concentrate the magnetic flux, reducing external magnetic field distribution and maintaining internal flux, thereby minimizing crosstalk and enhancing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a coreless planar coil is used to deliver signal or power, then the coil can be manufactured at low cost and integrated on PCB, but the magnetic field distribution becomes very large causing crosstalk and efficiency degradation
Solution Approach 1:
A metal ring is introduced as an intermediary component between the coil body and the external environment. The metal ring acts as a magnetic field mediator that redirects and confines the magnetic flux, preventing it from spreading to surrounding areas. This intermediary structure effectively reduces crosstalk while maintaining the coreless planar coil's manufacturing advantages
Solution Approach 2:
The metal ring provides localized magnetic field confinement at the boundaries of the coil. By enhancing the magnetic properties locally at the ring structure, the magnetic flux is concentrated and guided in specific paths, creating different magnetic field characteristics in different spatial zones - confined inside the ring and reduced outside
2Device complexity
If a coreless planar coil is used, then the structure remains simple and compact, but the magnetic field distribution range becomes too large reducing efficiency
Solution Approach 1:
The metal ring serves as a simple intermediary structure that concentrates magnetic flux without adding significant complexity to the overall design. The ring guides magnetic field lines through a defined path, reducing energy loss from stray fields while maintaining the simplicity and compactness of the coreless planar coil structure
Solution Approach 2:
The metal ring changes the magnetic field distribution parameters by creating a concentrated flux pattern. The ring's geometry and material properties are optimized to achieve the desired magnetic field concentration, transforming the diffuse magnetic field into a focused pattern that improves efficiency without complicating the 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 solution effectively reduces magnetic field leakage outside the coil, concentrating it within the coil, thereby reducing crosstalk and improving the efficiency of the coreless planar coil and power transformer systems.
Implementation Method 1
a first metal ring arranged around the coil body in the plane and configured to produce a first magnetic field having a direction opposite to the alternating magnetic field produced by the coil body
Implementation Method 2
a second metal ring arranged inside the coil body in the plane and configured to produce a second magnetic field having a direction opposite to the alternating magnetic field produced by the coil body
Data Source
AI summary
A coreless planar coil and a power transformer. The coreless planar coil includes a coil body arranged in a plane and configured to produce an alternating magnetic field for delivering signal or power; and a first metal ring arranged around the coil body in the plane and configured to produce a first magnetic field having a direction opposite to the alternating magnetic field produced by the coil body.