Inductive Aerosol Heating with Opposing Field Leakage Control
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Solution Overview
Problem
Induction heating systems for aerosol generating devices face electromagnetic field leakage, which necessitates a solution to reduce user exposure and improve heating control without complex shielding structures.
Innovation Solution
An aerosol generating system incorporating a primary susceptor heated by a primary electromagnetic field and a secondary susceptor that generates a secondary electromagnetic field opposing the primary field, reducing leakage and minimizing user exposure, with the secondary susceptor having lower electrical resistivity to prevent heating and using an electromagnetic shield for enhanced energy transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If an induction heating system is used to heat the aerosol generating substrate, then heating control is improved, but electromagnetic field leakage occurs
Solution Approach 1:
The patent introduces a shielding structure comprising a first shielding member and a second shielding member that act as intermediaries between the induction heating element and the external environment. These shielding members block electromagnetic field leakage while allowing heat to reach the aerosol generating substrate, thus resolving the contradiction between improved heating control and electromagnetic field leakage.
Solution Approach 2:
The shielding structure is divided into multiple segments (first shielding member and second shielding member) that can be positioned at different locations around the induction heating element. This segmentation allows the system to effectively block electromagnetic fields from multiple directions while maintaining heating efficiency, addressing both heating control and electromagnetic leakage issues.
2Object-affected harmful factors
If a complex electromagnetic shield structure is added to reduce electromagnetic leakage, then user exposure is reduced, but device complexity increases
Solution Approach 1:
The patent employs thin film shielding members that can be positioned around the induction heating element. These thin films effectively block electromagnetic field leakage and reduce user exposure while maintaining a compact and relatively simple device structure, thus resolving the contradiction between reducing electromagnetic exposure and maintaining device simplicity.
Solution Approach 2:
The shielding members act as intermediaries that block electromagnetic fields without requiring complex structural arrangements. By positioning these shielding members strategically around the heating element, the system achieves effective electromagnetic field containment with minimal impact on device complexity.
3Object-affected harmful factors
If the secondary susceptor has lower electrical resistivity to prevent heating, then electromagnetic field attenuation is improved, but heating efficiency of primary susceptor may be affected
Solution Approach 1:
The patent applies different electrical resistivity characteristics to different components: the primary susceptor has higher electrical resistivity to generate heat efficiently, while the secondary susceptor has lower electrical resistivity to attenuate electromagnetic fields without excessive heating. This local differentiation of material properties resolves the contradiction between electromagnetic field attenuation and heating efficiency.
Solution Approach 2:
The system is segmented into two functional components with distinct electrical properties: the primary susceptor optimized for heat generation and the secondary susceptor optimized for electromagnetic field attenuation. This segmentation allows each component to perform its specific function effectively without compromising the other, addressing both heating efficiency and electromagnetic field attenuation requirements.
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 system effectively heats the aerosol generating substrate without burning it, reducing electromagnetic leakage and enhancing user safety by containing the electromagnetic field within the device boundary, thus improving heating control and user comfort.
Implementation Method 1
The primary susceptor is heated by the primary electromagnetic field due to eddy currents and/or magnetic hysteresis losses resulting in a conversion of energy from electromagnetic to heat
Implementation Method 2
The primary susceptor is heated by the primary electromagnetic field due to eddy currents and/or magnetic hysteresis losses resulting in a conversion of energy from electromagnetic to heat
Implementation Method 3
a secondary susceptor configured to solely generate a secondary electromagnetic field acting in opposition to the primary electromagnetic field, wherein the secondary electromagnetic field is generated under the influence of the primary electromagnetic field
Data Source
AI summary
An aerosol generating system comprises an aerosol generating substrate, an inductor for generating a primary electromagnetic field, a primary susceptor configured to be inductively heated by the primary electromagnetic field and to solely heat the aerosol generating substrate, and a secondary susceptor configured to solely generate a secondary electromagnetic field. The secondary electromagnetic field is generated under the influence of the primary electromagnetic field and acts in opposition to the primary electromagnetic field.