Partial Shield Film for Induction Coil EMI
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Solution Overview
Problem
Induction heating-type aerosol generating devices face issues with electromagnetic interference (EMI) from induction coils, which can affect other electronic components and potentially harm users, necessitating a solution to block these electromagnetic waves effectively.
Innovation Solution
Incorporating a shield film with a ferromagnetic material around a portion of the induction coil to block electromagnetic waves with frequencies not exceeding 500 kHz, allowing for partial shielding without fully encasing the coil, thus simplifying manufacturing and maintaining structural freedom.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a shield film surrounds the entire outer surface of the induction coil, then electromagnetic interference blocking is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The shield film is divided into multiple segments that are arranged around the induction coil rather than forming a complete enclosure. This segmentation allows the shielding structure to block electromagnetic interference effectively while reducing manufacturing complexity and allowing access to the coil terminals.
Solution Approach 2:
The shield film is applied selectively to specific portions of the induction coil outer surface where electromagnetic interference needs to be blocked, rather than enclosing the entire coil. This localized shielding approach maintains EMI protection while simplifying the overall structure and facilitating easier manufacturing.
2Object-affected harmful factors
If a shield film completely encases the induction coil, then electromagnetic wave blocking is improved, but ease of manufacture deteriorates due to increased complexity
Solution Approach 1:
The shield film is configured as multiple separate segments rather than a single continuous enclosure. This segmentation simplifies the manufacturing process by allowing each segment to be produced and positioned independently, reducing the complexity of assembling a complete encasement while maintaining effective electromagnetic wave blocking.
3Device complexity
If the shield film surrounds only a portion of the induction coil, then device complexity is reduced, but electromagnetic interference blocking may be insufficient
Solution Approach 1:
The shield film is strategically positioned to surround specific portions of the induction coil where electromagnetic interference needs to be blocked. This localized shielding approach ensures adequate EMI protection for critical areas while maintaining simplicity in the overall shielding structure.
Solution Approach 2:
The shield film acts as an intermediary element between the induction coil and the surrounding environment, blocking electromagnetic interference in the critical directions where it would affect other components or users, while allowing the structure to remain simple and manufacturable.
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 shield film effectively blocks electromagnetic interference, preventing harmful effects on users and ensuring stable operation of the aerosol generating device while allowing for the arrangement of other components on the unshielded portions of the induction coil.
Implementation Method 1
a shield film including a ferromagnetic material for blocking electromagnetic interference from electromagnetic waves emitted from the induction coil
Implementation Method 2
an induction coil that receives an alternating current to form an alternating magnetic field
Implementation Method 3
a magnetic material that generates heat resulting from a magnetic field applied from the outside
Data Source
AI summary
An aerosol generating device includes an accommodation space in a cylindrical shape for accommodating a cigarette, an induction coil wound along an outer surface of the accommodation space, a power supply for supplying electric power to the induction coil, a controller for controlling electric power supplied to the induction coil, and a shield film including a ferromagnetic material for shielding electromagnetic interference from electromagnetic waves emitted from the induction coil. The shield film surrounds only a portion of an outer surface of the induction coil to shield the electromagnetic interference from the electromagnetic waves having a frequency that does not exceed 500 kHz.