Vapour Device Induction Heating Assembly With Low-Pass Shielding

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Solution Overview

Problem

Induction heating systems in vapour generating devices suffer from electromagnetic field leakage, necessitating a solution to address this issue while simplifying the construction and reducing the size and manufacturing cost of the induction heating assembly.

Innovation Solution

Incorporating a low-pass filter positioned adjacent to the induction coil, which functions as both a low-pass filter and an electromagnetic shield, reducing electromagnetic field leakage and minimizing the number of electronic components.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If an induction coil is provided to generate electromagnetic field for heating, then heating control is improved, but electromagnetic field leakage occurs

Engineering Contradiction:

Improveheating controlVSAvoidelectromagnetic field leakage

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

A low-pass filter is introduced as an intermediary component between the power source and the induction coil. This filter acts as a mediator that allows the beneficial electromagnetic field for heating to pass through while blocking harmful high-frequency leakage fields, thus resolving the contradiction between heating control and electromagnetic field leakage.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Object-affected harmful factors

If separate electromagnetic shield is added to prevent leakage, then electromagnetic shielding is improved, but device complexity increases

Engineering Contradiction:

Improveelectromagnetic shieldingVSAvoidnumber of electronic components

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The low-pass filter is designed to serve dual functions: it acts as both a low-pass filter for the induction coil and as an electromagnetic shield. By merging these two separate functions into a single component, the patent reduces device complexity while maintaining effective electromagnetic shielding.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The low-pass filter is designed as a multi-functional component that simultaneously provides filtering and electromagnetic shielding capabilities. This universal component approach eliminates the need for separate shields, thereby reducing the overall number of electronic components in the device.

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Reliability

If multiple electronic components are used, then filtering and shielding functions are achieved, but manufacturing cost increases

Engineering Contradiction:

Improvefiltering and shielding functionsVSAvoidmanufacturing cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

By combining the low-pass filter and electromagnetic shield into a single integrated component, the patent reduces the total number of parts that need to be manufactured, assembled, and tested. This merging of functions directly lowers manufacturing costs while maintaining the required filtering and shielding performance.

Inventive Principle:

Principle #5Merging (Combining)

4Reliability

If multiple electronic components are used, then filtering and shielding functions are achieved, but device size increases

Engineering Contradiction:

Improvefiltering and shielding functionsVSAvoiddevice size

Core Design Contradiction:

ReliabilityVSVolume of moving object

Solution Approach 1:

The integration of multiple functions into a single low-pass filter component significantly reduces the overall volume occupied by electronic components. Instead of having separate filter and shield components that would require additional space for mounting and assembly, the unified component occupies minimal space while providing both functions.

Inventive Principle:

Principle #5Merging (Combining)

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 low-pass filter enhances electromagnetic shielding, reduces component count, and decreases the size and manufacturing cost of the induction heating assembly, while maintaining effective vapour generation control.

Implementation Method 1

The low-pass filter is also structured to provide an electromagnetic shield for the induction coil

Methodology Applied

Scientific EffectElectromagnetic shielding: Faraday Cage

Implementation Method 2

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

Methodology Applied

Scientific EffectInduction heating: Induction Heating

Implementation Method 3

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 which in turn generates an alternating electromagnetic field

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Data Source

PatentEP3732937B1Induction heating assembly for a vapour generating device

Publication Date: 2025.08.27 JT INTERNATIONAL SA

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Figure 3a~3b
Figure 4a~4b

AI summary

An induction heating assembly (20) for a vapour generating device (10) comprises an induction coil (30) and a low-pass filter (34) positioned adjacent to the induction coil (30). The low-pass filter (34) is electrically connected to the induction coil (30) to act as a low-pass filter for the induction coil (30) and is shaped to extend substantially across at least one side of the induction coil (30) to provide an electromagnetic shield for the induction coil (30).