Induction Aerosol Heating with Opposing Field Leakage Suppression
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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 by confining the net field boundary within the device, with the secondary susceptor having lower electrical resistivity to prevent heating and the primary susceptor having higher resistivity for efficient heating, along with an optional electromagnetic shield for enhanced energy transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
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:
A secondary susceptor is introduced as an intermediary component between the inductor and the external environment. This secondary susceptor generates a secondary electromagnetic field that opposes the primary field, acting as a mediator to cancel out field leakage while allowing the primary susceptor to maintain efficient heating control through the primary field.
Solution Approach 2:
The patent converts the harmful electromagnetic field leakage into a beneficial effect by using the same primary electromagnetic field that causes leakage to induce a secondary field in the secondary susceptor. This secondary field, generated under the influence of the primary field, opposes and cancels the leakage, transforming the harmful radiation into a useful shielding mechanism.
2Object-affected harmful factors
If a complex electromagnetic shield structure is added to reduce electromagnetic leakage, then electromagnetic field leakage is reduced, but device complexity increases
Solution Approach 1:
The secondary susceptor is designed to automatically generate the opposing electromagnetic field through the influence of the primary electromagnetic field itself. This self-service mechanism eliminates the need for external power sources, control circuits, or complex active shielding structures, reducing device complexity while maintaining effective leakage reduction.
Solution Approach 2:
The patent changes the electrical resistivity parameter of the secondary susceptor to be lower than that of the primary susceptor. This parameter change enables the secondary susceptor to efficiently conduct the induced currents necessary for generating the opposing field, achieving effective shielding through a simple passive component rather than a complex structure.
3Object-affected harmful factors
If the secondary susceptor has lower electrical resistivity to prevent heating, then electromagnetic field leakage is reduced, but heating efficiency of the primary susceptor must be maintained
Solution Approach 1:
The patent applies different electrical resistivity qualities to different components: the primary susceptor has higher electrical resistivity optimized for efficient heating through electromagnetic induction, while the secondary susceptor has lower electrical resistivity optimized for generating the opposing field without excessive heating. This local differentiation of material properties allows each component to perform its specific function optimally.
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 reduces electromagnetic leakage, enhances heating control, and minimizes user exposure to electromagnetic fields while maintaining efficient energy transfer to the aerosol generating substrate, ensuring safe and controlled aerosol production.
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
an induction coil (also referred to as an inductor) is provided with the device and a susceptor is provided, for example with the aerosol generating substrate. 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 4
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
Implementation Method 5
heat the aerosol generating substrate, without burning the aerosol generating substrate, to volatise at least one component of the aerosol generating substrate and thereby generate a vapour
Implementation Method 6
generate a vapour which cools and condenses to form an aerosol for inhalation by a user of the device
Data Source
Figure 1
Figure 2a~2c
Figure 3
AI summary
An aerosol generating system (1, 2, 3) comprises an aerosol generating substrate (26), an inductor (29) for generating a primary electromagnetic field (42), a primary susceptor (28) configured to be inductively heated by the primary electromagnetic field (42) and to solely heat the aerosol generating substrate (26), and a secondary susceptor (40) configured to solely generate a secondary electromagnetic field (44). The secondary electromagnetic field (44) is generated under the influence of the primary electromagnetic field (42) and acts in opposition to the primary electromagnetic field (42).