Asymmetric Shielded Inductor Structure for EMI Isolation
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Solution Overview
Problem
Commercially available inductors have a small shielding range and poor electromagnetic interference (EMI) shielding effect due to copper foil covering only symmetrical terminals, leading to significant magnetic field radiation and instability.
Innovation Solution
An inductor design with an encapsulation shell and a metal shield layer that asymmetrically covers the surface, electrically isolating input and output electrodes, and extending from the top to the bottom surface to maximize shielding, including the inductive component, while maintaining electrical isolation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If copper foil is wrapped around symmetrical terminals to shield the inductor, then the inductor structure is simple and easy to manufacture, but the shielding range is small and the shielding effect is poor
Solution Approach 1:
The patent applies asymmetry by configuring the metal shield layer to extend from one end of the encapsulation shell along the side surface to the other end, creating an asymmetric shielding structure that provides comprehensive coverage. This asymmetric design ensures that the shield layer covers critical areas including the inductive component and electrodes, achieving complete electromagnetic shielding while maintaining manufacturing simplicity.
2Ease of manufacture
If copper foil is used for magnetic shielding, then the manufacturing process is simple, but the coverage area is limited and magnetic field radiation is significant
Solution Approach 1:
The patent transitions from two-dimensional terminal wrapping to three-dimensional comprehensive coverage by extending the metal shield layer along the side surface from one end to the other end of the encapsulation shell. This dimensional expansion ensures that the shielding coverage includes the inductive component, electrodes, and surrounding areas, significantly increasing the effective shielding area while maintaining manufacturing simplicity through a single continuous layer.
3Object-affected harmful factors
If the metal shield layer asymmetrically covers the encapsulation shell surface, then the electromagnetic shielding effect is enhanced, but the electrical isolation between input and output electrodes must be maintained
Solution Approach 1:
The patent applies local quality by configuring the metal shield layer to extend along the side surface away from the input electrode, providing enhanced shielding in critical areas while maintaining electrical isolation from the input electrode. The shield layer is positioned to cover the inductive component and output electrode region, ensuring electromagnetic shielding effectiveness while the encapsulation shell maintains electrical isolation between input and output electrodes.
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
Enhances electromagnetic shielding, reduces external radiation, and maintains stable potential, improving production efficiency and reducing the risk of short circuits.
Implementation Method 1
the inductor, serving as a power device, generates a magnetic field during operation which is easily radiated to the outside, affecting the normal operation of other circuits and components. Therefore, it is necessary to magnetically shield the inductor.
Implementation Method 2
an encapsulation shell with an inductive component encapsulated inside; an input electrode exposed on a surface of the encapsulation shell and configured to receive an alternating voltage; an output electrode exposed on the surface of the encapsulation shell and configured to output a direct current voltage, where the input electrode and the output electrode are electrically isolated by the encapsulation shell
Data Source
AI summary
An inductor includes an encapsulation shell with an inductive component encapsulated inside; an input electrode exposed on a surface of the encapsulation shell and configured to receive an alternating voltage; an output electrode exposed on the surface of the encapsulation shell and configured to output a direct current voltage, where the input electrode and the output electrode are electrically isolated by the encapsulation shell; and a metal shield layer asymmetrically covering the surface of the encapsulation shell and electrically connected to the output electrode, where the metal shield layer keeps the input electrode electrically isolated from the output electrode. An inductor fabrication method and a power supply circuit containing an inductor are further provided to resolve prior-art problems such as small range and poor effect of electromagnetic shielding and potential instability of the inductor, thereby achieving a better electromagnetic shielding effect and keeping the potential of the inductor stable.