Inductive Device Guard Ring for Stray Magnetic Field Interference
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Solution Overview
Problem
Solenoid magnetic devices generate strong magnetic fields that lead to stray magnetic field lines, causing interference with adjacent metallic components and inducing excessive eddy currents, which affects the operation of electrical appliances.
Innovation Solution
An inductive device design featuring a substrate with a solenoid magnetic structure, including a magnetic core and metal winding layers, along with a guard ring element and shielding layer made of magnetic material, strategically positioned to manage magnetic field lines and reduce interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If a magnetic core is added to increase magnetic field strength, then inductance increases, but stray magnetic field lines increase causing interference with adjacent metallic components
Solution Approach 1:
A magnetic shielding layer is introduced as an intermediary component between the inductive device and adjacent metallic components. This shielding layer, made of magnetic material, intercepts and redirects stray magnetic field lines, preventing them from reaching and interfering with adjacent metallic components while allowing the inductive device to maintain its high magnetic field strength for increased inductance
Solution Approach 2:
The patent converts the harmful stray magnetic field lines into a beneficial effect by using a magnetic shielding layer to redirect these field lines through a controlled path. The shielding layer guides the magnetic flux through designated routes, transforming the previously harmful interference into a controlled magnetic field distribution that protects adjacent components while maintaining device performance
2Power
If magnetic field strength is increased, then inductance increases, but eddy current loss in adjacent metallic components increases
Solution Approach 1:
The magnetic shielding layer acts as an intermediary that intercepts stray magnetic field lines before they can penetrate into adjacent metallic components. By providing an alternative low-reluctance path for magnetic flux, the shielding layer prevents the induction of eddy currents in adjacent metallic components, thereby reducing energy loss while allowing the inductive device to operate at high magnetic field strengths
3Area of stationary object
If inductive devices are placed closer together to increase device density, then space utilization improves, but magnetic interference between devices increases
Solution Approach 1:
The magnetic shielding layer serves as a mediator between adjacent inductive devices, blocking the propagation of stray magnetic field lines from one device to another. This allows inductive devices to be placed closer together on the substrate, increasing device density and space utilization, while the shielding layers on each device prevent mutual magnetic interference, maintaining device performance even at higher densities
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 effectively reduces stray magnetic field interference, minimizing eddy current losses and allowing for closer placement of inductive devices, thereby increasing device density and reliability.
Implementation Method 1
When a current (which may be an alternating current or a direct current) passes through the solenoids, a magnetic field is induced in the solenoids. This induced magnetic field magnetizes the magnetic core, and the magnetic field of the magnetized magnetic core adds to the magnetic field induced in the solenoids.
Implementation Method 2
a magnetic core formed of ferromagnetic material such as iron
Implementation Method 3
a guard ring element arranged under the top metal ring element and around the magnetic core layer, spaced apart from the magnetic core layer, where the guard ring element may include a magnetic material
Implementation Method 4
the stray magnetic field lines can induce eddy currents in the metallic components, which can cause excessive eddy current loss in these components
Data Source
AI summary
An inductive device may be provided, including a substrate and an inductive structure arranged over the substrate. The inductive structure may include a bottom metal winding layer; a top metal winding layer arranged further away from the substrate than the bottom metal winding layer; a magnetic core layer arranged between the bottom metal winding layer and the top metal winding layer; a connector arranged to electrically connect the bottom metal winding layer and the top metal winding layer; and a top metal ring element arranged around the top metal winding layer, spaced apart from the top metal winding layer. The inductive device may further include a guard ring element arranged under the top metal ring element and around the magnetic core layer, spaced apart from the magnetic core layer; wherein the guard ring element may include a magnetic material.