Dual-Layer Induction Heating Shield for EM Leakage Control
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Solution Overview
Problem
Induction heating systems for vapor generating devices face issues with electromagnetic field leakage, which can lead to inefficiencies and potential damage to device components due to excessive heat.
Innovation Solution
The induction heating assembly incorporates a dual electromagnetic shield structure with differing electrical conductivity and magnetic permeability, along with insulating layers to suppress current flow and minimize electromagnetic field leakage, ensuring efficient energy transfer and reduced heat generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single electromagnetic shield layer is used, then the structure is simple, but electromagnetic field leakage is not sufficiently reduced
Solution Approach 1:
The electromagnetic shield is divided into multiple layers with different material properties. The first layer uses a ferrimagnetic, non-electrically conductive material to address magnetic field leakage, while the second layer uses an electrically conductive material to address electric field leakage. This segmentation allows each layer to target specific types of electromagnetic interference, achieving comprehensive shielding without requiring a single complex material.
Solution Approach 2:
The shield structure employs composite materials with different electrical and magnetic properties. By combining ferrimagnetic non-conductive material in the first layer with electrically conductive material in the second layer, the system creates a composite shield that leverages the complementary strengths of different materials to reduce both magnetic and electric field leakage effectively.
2Object-affected harmful factors
If electromagnetic shield layers are added, then electromagnetic field leakage is reduced, but the device size increases
Solution Approach 1:
The electromagnetic shield layers are implemented as thin film structures that can be applied directly to the induction coil surface. This approach provides effective electromagnetic shielding while minimizing the additional volume required, as the shield layers are sufficiently thin to not significantly increase device size while still achieving the desired shielding effect.
3Object-affected harmful factors
If electromagnetic shield layers are positioned close to the induction coil, then shielding effectiveness is improved, but heat generation in the shield increases
Solution Approach 1:
An insulating layer is introduced as an intermediary between the induction coil and the first electromagnetic shield layer. This insulating layer prevents direct thermal coupling while allowing the shield to maintain its electromagnetic shielding function. The insulator acts as a thermal barrier that reduces heat transfer to the shield structure, thereby minimizing temperature rise in the shield layers despite their proximity to the heating coil.
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
This design results in a compact, efficient, and lightweight induction heating assembly that enhances heating efficiency, reduces component damage, and protects electronic components by minimizing heat and electromagnetic interference.
Implementation Method 1
an induction coil (hereinafter also referred to as an inductor) is provided with the device and a susceptor is provided with the vaporisable substance. Electrical energy is provided to the inductor when a user activates the device which in turn generates an alternating electromagnetic field. The susceptor couples with the electromagnetic field and generates heat
Implementation Method 2
a first electromagnetic shield layer arranged outward of the induction coil; a second electromagnetic shield layer arranged outward of the first electromagnetic shield layer; wherein the first and second electromagnetic shield layers differ in one or both of their electrical conductivity and their magnetic permeability
Implementation Method 3
Current flow in the one or more electromagnetic shield layers is suppressed which reduces heat generation in the shield structure (due to Joule heating) and thereby reduces energy losses
Data Source
AI summary
An induction heating assembly for a vapour generating device includes an induction coil and a heating compartment arranged to receive an induction heatable cartridge. A first electromagnetic shield layer is arranged outward of the induction coil and a second electromagnetic shield layer is arranged outward of the first electromagnetic shield layer. The first and second electromagnetic shield layers differ in one or both of their electrical conductivity and their magnetic permeability.