CN117717202A

CN117717202A - Gas mist generating device, heater for gas mist generating device, and control method

Info

Publication number: CN117717202A
Application number: CN202211105420.7A
Authority: CN
Inventors: 张淑媛; 徐中立; 李永海
Original assignee: Shenzhen FirstUnion Technology Co Ltd
Current assignee: Shenzhen FirstUnion Technology Co Ltd
Priority date: 2022-09-09
Filing date: 2022-09-09
Publication date: 2024-03-19

Abstract

The application provides an aerosol-generating device, a heater for the aerosol-generating device and a control method; wherein the aerosol-generating device is configured to heat the aerosol-generating article to generate an aerosol; comprising the following steps: a heating coil configured in the shape of a solenoid coil; the heating coil comprises an electrically conductive magnetic material; a circuit configured to provide an AC drive current to the heating coil such that the heating coil heats the aerosol-generating article due to joule heat when the AC drive current flows. In the above-described aerosol-generating device, the heating coil itself generates heat by joule heat by supplying an AC driving current to the heating coil of the electromagnetic material.

Description

Gas mist generating device, heater for gas mist generating device, and control method

Technical Field

The embodiment of the application relates to the technical field of heating non-combustion aerosol generation, in particular to an aerosol generation device, a heater for the aerosol generation device and a control method.

Background

Smoking articles (e.g., cigarettes, cigars, etc.) burn tobacco during use to produce tobacco smoke. Attempts have been made to replace these tobacco-burning products by making products that release the compounds without burning.

An example of such a product is a heating device that releases a compound by heating rather than burning a material. For example, the material may be tobacco or other non-tobacco products that may or may not contain nicotine. Known heating devices heat by inserting pin or needle-like resistive heaters into tobacco or other non-tobacco products.

Disclosure of Invention

One embodiment of the present application provides an aerosol-generating device configured to heat an aerosol-generating article to generate an aerosol; comprising the following steps:

a heating coil configured in the shape of a solenoid coil; the heating coil includes an electrically conductive magnetic material;

a circuit configured to provide an AC drive current to the heating coil such that the heating coil heats up the aerosol-generating article due to joule heat when the AC drive current flows.

In some implementations, the heating coil is helically wound with a wire comprising an electrically conductive magnetic material.

In some implementations, the curie temperature of the heating coil is not less than 450 ℃.

In some implementations, the heating coil includes a conductive ferromagnetic material or a ferrimagnetic material.

In some implementations, the frequency of the AC drive current is between 80KHz and 2000KHz.

In some implementations, the wire material of the heating coil has a cross-section that extends in an axial direction that is greater than a dimension that extends in a radial direction.

In some implementations, the cross-section of the wire material of the heating coil extends in an axial direction to a dimension of 0.5-2.0 mm;

and/or the dimension of the radial extension of the section of the wire material of the heating coil is 0.1-0.5 mm.

In some implementations, the heating coil includes 6 to 18 turns.

In some implementations, further comprising:

a base thermally conductive with the heating coil; in use the substrate heats up at least by receiving heat from the heating coil, which in turn heats up the aerosol-generating article.

In some implementations, the heating coil is non-contact with the aerosol-generating article.

In some implementations, the matrix is non-receptive or weakly receptive.

In some implementations, the substrate includes, for example, ceramic, glass, surface insulating metal such as surface oxidized stainless steel, and the like. And, when the substrate comprises a metal or alloy, the substrate is substantially non-receptive, such as aluminum, or is weakly receptive, such as grade 304 stainless steel, and not strongly receptive, grade 430/420 stainless steel.

In some implementations, the substrate itself is substantially non-exothermic or generates little heat. The substrate is not a strong receptive metal or alloy. Alternatively, a weakly receptive matrix means that the magnetic metal, such as iron, etc., in the matrix may be present as austenite rather than ferrite; such as austenitic stainless steel, e.g., 304 stainless steel, 321 stainless steel, 316 stainless steel, etc.

And in some implementations, the heating coil includes a ferritic stainless steel, such as grade 430/420 stainless steel.

In some implementations, the substrate itself generates substantially no or less heat when the circuit provides AC drive current to the heating coil.

In some implementations, the substrate itself heats less, meaning that when an AC drive current flows through the heating coil, the hysteresis eddy current heat generated by the substrate itself penetrated by the magnetic field of the heating coil is significantly less than the heat transferred from the heating coil. Or more certainly, the substrate is less inductively heated, meaning that when an AC drive current flows through the heating coil, the substrate itself is less than 20% or less of the heat transferred from the heating coil due to eddy current hysteresis heat generated by penetration of the substrate by the magnetic field of the heating coil.

In some implementations, further comprising:

a chamber for receiving at least a portion of an aerosol-generating article;

the heating coil is isolated from the chamber by the substrate.

In some implementations, the heating coil is arranged not to be exposed to the chamber.

In some implementations, further comprising:

a chamber for receiving at least a portion of an aerosol-generating article;

the substrate is arranged to extend at least partially within the chamber for insertion into an aerosol-generating article for heating;

the base has an axially extending cavity, and the heating coil is received and held within the cavity of the base.

In some implementations, further comprising:

a chamber for receiving at least a portion of an aerosol-generating article;

the substrate is arranged to at least partially surround or define the chamber;

the heating coil is disposed around at least a portion of the substrate and is at least partially supported by the substrate.

In some implementations, further comprising:

a conductive lead for guiding an electric current between the electric circuit and the heating coil;

the conductive lead includes:

the conductive wire and the metal coating layer are formed on the surface of the conductive wire.

In some implementations, further comprising:

the first thermocouple wire is connected with the first end of the heating coil;

the second thermocouple wire is connected with the second end of the heating coil;

the first thermocouple wire and the second thermocouple wire have different materials, and a thermocouple for sensing the temperature of the heating coil is formed between the first thermocouple wire and the second thermocouple wire.

In some implementations, further comprising:

the circuit is configured to determine a temperature of the heating coil by acquiring a thermoelectric voltage difference between the first thermocouple wire and the second thermocouple wire;

the circuit is configured to terminate or stop the supply of the AC drive current to the heating coil when a thermoelectric voltage difference between the first thermocouple wire and the second thermocouple wire is acquired; and/or the circuit is configured to cause the acquisition of the thermal potential difference to be performed at a time different from the supply of the AC drive current to the heating coil.

In some implementations, the substrate includes at least one of a ceramic, a glass, a non-receptive metal or alloy, a poorly receptive metal or alloy.

In some implementations, the matrix has a thermal conductivity of 1-200W/m.k.

Yet another embodiment of the present application also proposes a heater for an aerosol-generating device comprising free front and rear ends facing away in a length direction, and:

a base extending at least partially between the free front end and the distal end; a cavity is formed in the substrate;

a heating coil located within the cavity and configured in the shape of a solenoid coil; the heating coil includes an electrically conductive magnetic material and is configured to generate heat due to joule heat when an AC driving current flows, thereby transferring heat to the substrate.

Yet another embodiment of the present application also proposes a heater for an aerosol-generating device, comprising:

a base configured to be a tubular shape extending in a longitudinal direction of the heater;

a heating coil configured to be a solenoid coil surrounding at least a portion of the base and at least partially supported by the base; the heating coil and the substrate are thermally conductive to each other; the heating coil includes an electrically conductive magnetic material and is configured to generate heat due to joule heat when an AC driving current flows, thereby transferring heat to the substrate.

Yet another embodiment of the present application also proposes a control method of an aerosol-generating device; the aerosol-generating device is configured to heat an aerosol-generating article to generate an aerosol and comprises:

a heating coil configured in the shape of a solenoid; the heating coil includes an electrically conductive magnetic material;

the method comprises the following steps:

an AC drive current is supplied to the heating coil such that the heating coil is driven by the AC drive current to generate joule heat to generate heat, thereby directly or indirectly heating the aerosol-generating article.

Yet another embodiment of the present application also proposes an aerosol-generating device configured to heat an aerosol-generating article to generate an aerosol; comprising the following steps:

a heating coil for heating the aerosol-generating article;

a first conductive lead connected to a first end of the heating coil;

a second conductive lead connected to a second end of the heating coil;

a circuit configured to power the heating coil through the first and second conductive leads and to determine a temperature of the heating coil through a thermoelectric potential difference between the first and second thermocouple wires.

In some implementations, the circuit is configured to provide an AC drive current to the heating coil through the first and second conductive leads such that the heating coil is driven by the AC drive current to generate joule heat to generate heat.

In some implementations, the circuit is configured to terminate or stop providing the AC drive current to the heating coil when a thermoelectric voltage difference between the first thermocouple wire and the second thermocouple wire is acquired;

and/or the circuit is configured to cause the acquisition of the thermal potential difference to be performed at a time different from the supply of the AC drive current to the heating coil.

In some implementations, the circuit is further configured to adjust a frequency and/or duty cycle of the AC drive current provided to the heating coil based on the determined temperature of the heating coil to maintain the temperature of the heating coil below a preset temperature threshold.

A heating coil located within the cavity and configured in the shape of a solenoid coil; the heating coil and the substrate are thermally conductive to each other;

a first conductive lead connected to a first end of the heating coil;

a second conductive lead connected to a second end of the heating coil; so that in use, the heating coil can be powered by the first and second conductive leads;

the second thermocouple wire is connected with the second end of the heating coil; so that in use, the temperature of the heating coil can be determined by the thermoelectric voltage difference between the first thermocouple wire and the second thermocouple wire.

In the above-described aerosol-generating device, the heating coil itself generates heat by joule heat by supplying an AC driving current to the heating coil of the electromagnetic material.

Drawings

One or more embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings, in which like references indicate similar elements, and in which the figures of the drawings are not to be taken in a limiting sense, unless otherwise indicated.

FIG. 1 is a schematic diagram of an aerosol-generating device according to an embodiment;

FIG. 2 is a schematic diagram of one embodiment of the heater of FIG. 1;

FIG. 3 is an exploded view of the heater of FIG. 2 from one perspective;

FIG. 4 is a schematic diagram of one embodiment of a circuit;

FIG. 5 is a graph showing the inductance value as a function of frequency measured after the coil ends are connected to different conductive leads in one embodiment;

FIG. 6 is a graph showing the variation of Q value of the quality factor with frequency after connecting different conductive leads to the two ends of the coil in one embodiment;

FIG. 7 is a graph showing the high frequency impedance as a function of frequency for one embodiment after connecting different conductive leads across the coil;

FIG. 8 is a schematic illustration of a heating profile for an aerosol-generating article in one embodiment;

FIG. 9 is a graph of inductance values as a function of frequency for wire materials with different radial extension of the coil in one embodiment;

FIG. 10 is a graph showing the variation of Q value with frequency of quality factors tested for coil materials having different radial extension in one embodiment;

FIG. 11 is a graph showing inductance values as a function of frequency for a coil of wire material having different radial extension in yet another embodiment;

FIG. 12 is a graph showing the variation of Q value of quality factor with frequency for coil materials having different radial extension in accordance with yet another embodiment;

FIG. 13 is a graph showing inductance values as a function of frequency for a coil of wire material having different radial extension in yet another embodiment;

FIG. 14 is a graph showing the variation of Q value of quality factor with frequency for coil materials having different radial extension in accordance with yet another embodiment;

FIG. 15 is a graph showing inductance values as a function of frequency for coils having different outside diameter dimensions according to yet another embodiment;

FIG. 16 is a graph showing the variation of Q value of quality factor with frequency for coil of different outer diameter sizes according to yet another embodiment;

FIG. 17 is a schematic view of an aerosol-generating device provided by yet another embodiment;

fig. 18 is a schematic diagram of a control method of the aerosol-generating device of an embodiment.

Detailed Description

In order to facilitate an understanding of the present application, the present application will be described in more detail below with reference to the accompanying drawings and detailed description.

An embodiment of the present application proposes an aerosol-generating device, the configuration of which may be seen in fig. 1, comprising:

a chamber having an opening 40; in use, the aerosol-generating article 1000 is removably receivable within the chamber through the opening 40 of the chamber;

A heater 30 extending at least partially within the chamber, inserted into the aerosol-generating article 1000 when the aerosol-generating article 1000 is received within the chamber, for heating, such that the aerosol-generating article 1000 releases a plurality of volatile compounds, and such volatile compounds are formed by a heat treatment alone; the heater 30 includes a base 31 and a coil 32 accommodated in the base 31;

a battery cell 10 for supplying power;

the circuit 20 is connected to the rechargeable battery cell 10 by suitable electrical connections for converting the direct current output by the battery cell 10 into an alternating current of a suitable frequency for supply to the coil 32.

Further in an alternative implementation, the aerosol-generating article 1000 preferably employs tobacco-containing materials that release volatile compounds from a matrix upon heating; or may be a non-tobacco material capable of being heated and thereafter adapted for electrical heating for smoking. The aerosol-generating article 1000 preferably employs a solid matrix, which may comprise one or more of powders, granules, shredded strips, ribbons or flakes of one or more of vanilla leaves, tobacco leaves, homogenized tobacco, expanded tobacco; alternatively, the solid substrate may contain additional volatile flavour compounds, either tobacco or non-tobacco, to be released when the substrate is heated.

In one embodiment, the heater 30 is generally in the shape of a pin or needle, which is advantageous for insertion into the aerosol-generating article 1000. Meanwhile, the heater 30 may have a length of about 12 to 19 mm, and an outer diameter of 2.0 to 2.6 mm.

In one embodiment, the DC supply voltage provided by the battery 10 is in the range of about 2.5V to about 9.0V, and the amperage of the DC current that the battery 10 can provide is in the range of about 2.5A to about 20A.

Referring further to fig. 2, the post-assembly heater 30 is configured as a pin or cylinder or rod extending at least partially within the chamber; the heater 30 includes:

a base 31 configured in the shape of a pin or needle or column or bar; and the opposite ends of the base 31 in the length direction define a free front end 311 and a distal end 312, respectively, which form the heater 30; and, the base 31 has a cavity 313 therein extending between the free front end 311 and the distal end 312. Wherein cavity 313 forms an opening or mouth at end 312 to facilitate assembly of functional components therein.

A coil 32 accommodated or held in the base 31; coil 32 is configured as a conventional solenoid coil; in use, the coil 32 has conductive leads 321 and 322 connected to both ends thereof, respectively; for example, the conductive lead 321 is connected to an end of the coil 32 toward or near the proximal end 311 by welding or the like, and the conductive lead 322 is connected to an end of the coil 32 toward or near the distal end 312 by welding or the like; in use, coil 32 is connected to circuit 20 by conductive leads 321 and 322.

The coil 32 comprises an electrically conductive magnetic material operatively coupled to the circuit 20 by an electrically conductive lead 321 and an electrically conductive lead 322 and configured to cause the coil 32 of electrically conductive magnetic material to heat up due to joule heating when an AC drive current provided by the circuit 20 is passed through the coil 32.

In some implementations, the substrate 31 at least partially defines the outer shape of the heater 30; and, the base 31 has an outer diameter of about 2.0 to 2.6mm, and a wall thickness of about 0.1 to 0.3 mm; the inner diameter of the cavity 313 of the base 31 is about 1.5 to 2.3mm and the length of the cavity 313 is about 12 to 16mm.

In the embodiment, the substrate 31 is made of a heat conductive material; and, the substrate 31 may be insulating. The substrate 31 includes, for example, ceramics, glass, surface insulating metals such as surface oxidized stainless steel, and the like. And, when the substrate 31 comprises a metal or alloy, the substrate 31 is substantially non-receptive, such as aluminum, or is weakly receptive, such as grade 304 stainless steel, and not strongly receptive, grade 430/420 stainless steel. The substrate 31 itself is substantially non-exothermic or generates little heat. The substrate 31 is not a strong receptive metal or alloy. Alternatively, the weakly sensitive matrix 31 means that the magnetic metal such as iron or the like in the matrix 31 may exist as austenite rather than ferrite; such as austenitic stainless steel, e.g., 304 stainless steel, 321 stainless steel, 316 stainless steel, etc.

The substrate 31 itself heats less, meaning that when an AC drive current flows through the coil 32, the hysteresis eddy current heat formed by the substrate 31 itself in response to the magnetic field generated by the coil 32 is significantly less than the heat transferred from the coil 32. Or more certainly, the base 31 is less inductively heated, meaning that when an AC drive current flows through the coil 32, the base 31 itself generates less than 20% or less of the heat transferred from the coil 32.

In practice, the substrate 31 heats the aerosol-generating article 1000 primarily by receiving or transmitting heat from the coil 32. And in practice, the coil 32 does not extend outside the base 31, or the coil 32 is substantially entirely contained within the cavity 313. In use, the aerosol-generating article 1000 transfers heat through the substrate 31 and is thereby heated by the coil 32.

And in practice, the coil 32 is not in contact with the aerosol-generating article 1000.

In some embodiments, the substrate 31, which is made of ceramic, glass, or a poor-sensitivity stainless steel, has a thermal conductivity of about 1-200W/m.k. Or in still other implementations, the substrate 31 may also be made of a material having more higher thermal conductivity, such as a thermal conductivity of at least 40W/m.k, preferably or at least 100W/m.k; or in some implementations, the thermal conductivity of the matrix 31 is greater than 200W/m.k or higher. In some implementations, the substrate 31 includes a non-or weakly-receptive metal suitable for the above high thermal conductivity, such as aluminum, copper, titanium, or alloys containing at least one of them, and the like.

And in some implementations, the substrate 31 includes only one part or portion. Or in still other variations, the substrate 31 may comprise multiple pieces, or the substrate 31 may be composed of multiple pieces together; for example, the base body 31 is spliced from a plurality of tubular or needle-like parts or portions.

In some implementations, the coil 32 of conductive magnetic material is, for example, a ferromagnetic or ferrimagnetic material. In some implementations, at least a portion of the coil 32 of electrically conductive magnetic material may be made of at least one of ferromagnetic or ferrimagnetic material: nickel cobalt iron alloys (such as, for example, kovar or iron nickel cobalt alloy 1), armoium iron, permalloy (such as, for example, permalloy C), or ferritic or martensitic stainless steels. Or in still other implementations, the coil 32 of electrically conductive magnetic material includes a magnetic conductor material having a curie temperature of not less than 450 ℃, such as SUS430 grade stainless steel, SUS420 grade stainless steel, iron-aluminum alloy, iron-nickel alloy, and the like. The coil 32 includes a ferritic stainless steel such as SUS430 grade stainless steel, SUS420 grade stainless steel.

And in some implementations, the coil 32 comprises an electrically conductive ferromagnetic or ferrimagnetic material having an absolute permeability of at least 10 μh/m (microhenry/m), specifically at least 100 μh/m (microhenry/m), preferably at least 1mH/m (millihenry/m), most preferably at least 10mH/m or even at least 25 mH/m. Likewise, the electrically conductive ferromagnetic or ferrimagnetic material may have a relative permeability of at least 10, in particular at least 100, preferably at least 1000, most preferably at least 5000 or even at least 10000.

In practice, by passing an AC drive current through the coil 32 instead of a DC drive current, the effective resistance of the conductive coil 32, and thus the heating efficiency of the coil 32, is significantly improved. Unlike DC current, AC current flows primarily at the "skin" of the electrical conductor, between the outer surface of the coil 32 and a level called skin depth. The AC current density is greatest near the surface of the conductor and decreases with increasing depth in the conductor. As the frequency of the AC drive current increases, the skin depth decreases, which results in a decrease in the effective cross section of the coil 32, thereby increasing the effective resistance of the coil 32. This phenomenon is called the skin effect, which is basically the generation of opposite eddy currents induced by a change in the magnetic field generated by the AC drive current.

Operating the coil 32 of electrically conductive magnetic material with an AC drive current further allows the coil 32 of electrically conductive magnetic material to be substantially made of or consist essentially of a magnetic metal, such as an electrically conductive ferromagnetic or ferrimagnetic material, in particular a solid material, while still providing a sufficiently high resistance to heat generation. For example, in some implementations, the coil 32 is formed or prepared from a spiral winding of the wire of the above electrically conductive magnetic material.

And in practice the skin depth depends not only on the permeability of the coil 32 of electrically conductive magnetic material, but also on its resistivity and the frequency of the AC drive current. Thus, the skin depth may be reduced by at least one of reducing the resistivity of the conductive coil 32, increasing the permeability of the conductive coil 32, or increasing the frequency of the AC drive current. In some implementations, the frequency of the alternating current supplied by circuit 20 to coil 32 is between 80KHz and 2000KHz; more specifically, the frequency may be in the range of about 200KHz to 500 KHz. In one most general implementation, circuit 20 typically includes a capacitor and forms an LC resonant circuit with coil 32 via the capacitor; and, the circuit 20 oscillates by driving the LC resonant circuit at the above predetermined frequency to form an alternating current flowing through the coil 32.

A schematic diagram of a portion of the device in one implementation of circuit 20 is shown, for example, in fig. 4, where capacitor C is connected in series with coil 32 to form a series LC resonant circuit; the half bridge formed by the switching tube Q1 and the switching tube Q2 guides current between the battery core 10 and the LC resonance circuit; and in practice, the switching tube Q1 and the switching tube Q2 are driven by the controller chip or the switching tube driver chip to turn on and off at a desired frequency, thereby forming an alternating current flowing through the coil 32. Alternatively, in still other implementations, the circuit 20 may also employ a capacitor C to form an LC resonant circuit in parallel with the coil 32, and the LC resonant circuit is driven by a switch to oscillate to produce an AC drive current through the coil 32.

Or in still other variant implementations the frequency of the alternating current supplied by the circuit 20 to the coil 32 may be higher, for example greater than 1MHz; specifically, the frequency can be, for example, 1MHz to 20MHz.

In addition, in order to further avoid problems of micro-oxidation or possible corrosion of the coil 32 of the electrically conductive magnetic material in a long-term use environment, a protective layer such as a nickel layer, a non-metallic protective layer such as a glaze layer, or the like may be plated on the surface of the magnetic conductor material of the coil 32.

And in some implementations, the cross-sectional shape of the wire material of the coil 32 configured in the form of a solenoid is a shape other than a conventional circle in accordance with the embodiments shown in fig. 2 and 3. In the embodiment shown in fig. 2 and 3, the cross-section of the wire material of the coil 32 has a dimension extending in the axial direction that is greater than a dimension extending in the radial direction, so that the cross-section of the wire material of the coil 32 takes on a flat rectangular shape.

Briefly, the coil 32 of the above construction is in the form of a wire material that is completely or at least flattened as compared to a conventional helical coil formed from a circular cross-section wire. Thus, the wire material extends in the radial direction to a lesser extent. By this measure, the energy loss in the coil 32 can be reduced. In particular, the transfer of heat generated by the coil 32 in the radial direction toward the base 31 can be promoted.

And in some implementations, the cross-section of the wire material of the coil 32 has a dimension extending in the axial direction of between 0.5 and 2.0mm; for example, in some implementations, the cross-section of the wire material of the coil 32 has a dimension extending in the axial direction that is between 0.8mm and 1.5mm. And the cross-section of the wire material of the coil 32 extends in the radial direction by a dimension of 0.1 to 0.5mm; for example, in some implementations, the cross-section of the wire material of the coil 32 has a dimension extending in the radial direction that is between 0.15mm and 0.3mm.

Or in still other variations, the wire material of coil 32 is circular in cross-section.

And in some implementations, the coil 32 may have about 6-18 turns and a length of about 8-15 mm. And the outer diameter of the coil 32 is not more than 1.9mm at maximum, for example, the outer diameter of the coil 32 may be 1.6 to 1.9mm.

And in some implementations, the spacing between adjacent turns of the coil 32 is constant; for example, in some implementations, the spacing between adjacent turns of the coil 32 is in the range of 0.025-0.3 mm; for example, in some implementations, the spacing between adjacent turns of the coil 32 is in the range of 0.05-0.15 mm. Or in still other implementations, the spacing between adjacent turns of the coil 32 is varied. Or in yet other implementations, adjacent turns of the coil 32 have varying spacing therebetween.

And in some implementations, the cross-section of the solenoid-shaped coil 32 may be generally circular. Or in still other implementations the cross-section of the solenoid-shaped coil 32 may be rectangular, elliptical, square, etc.

And in some implementations, the outer diameter of coil 32 is slightly smaller than the diameter of cavity 313, which is advantageous for fitting coil 32 into cavity 313; the outer surface of the coil 32 has a gap with the inner surface of the cavity 313. And in some implementations, the gap may be between 0.025mm and 0.15mm; alternatively, in some implementations, the gap between the outer surface of the coil 32 and the inner surface of the housing 31 defining the cavity 313 may be between 0.025mm and 0.10mm.

And, with further reference to fig. 2, the heater 30 further comprises:

a base 34 at least partially surrounding or bonded to the base 31; the base 34 is disposed substantially adjacent the end 312 and the aerosol-generating device allows the heater 30 to be stably mounted and secured within the device by clamping or holding the base 34. And, the base 34 is substantially shielded from the coil 32; alternatively, base 34 is substantially at the end of coil 32 near tip 312. Or in still other embodiments, the base 34 is closer to the end 312 than the coil 32; or in yet other embodiments, the pedestals 34 are offset from the coils 32 along the length of the heater 30; or in still other embodiments, the base 34 is spaced more than 1mm from the coil 32 along the length of the heater 30.

In some embodiments, the base 34 is separately manufactured and then attached to the substrate 31 by riveting or mechanical fastening. Or in yet other embodiments, the base 34 is molded from a moldable material around the base 31. The base 34 is made of a moldable material such as an organic polymer, for example, PEEK, polytetrafluoroethylene, polyurethane, a polymeric resin, or the like, or a ceramic.

And in some implementations, the cavity 313 of the substrate 31 is also filled with a filler material, for example, formed by injecting a slurry into a gap or gap between the substrate 31 and the coil 32, and curing. The filler material is formed by, for example, injecting a ceramic paste, a glass paste, an inorganic oxide paste, a nitride paste, or the like into the cavity 313 and filling up the gap between the substrate 31 and the coil 32, and then curing. The above slurry is usually a suspension formed by mixing the solid powder of each of the above filler materials with a solvent; for example, the ceramic slurry may be formed by mixing ceramic raw material powder with an organic solvent.

Or in still other implementations, the filler material is thermally conductive; for example, the filler material comprises a metal oxide having excellent thermal conductivity (e.g., mgO, al ₂ O ₃ 、B ₂ O ₃ Etc.), metal nitride (Si ₃ N ₄ 、B ₃ N ₄ 、Al ₃ N ₄ Etc.), glass glaze with high temperature resistance or other high heat conduction composite ceramic materials can be used.

Or in still other implementations, the filler material includes a glue, such as a glass glue, a resin glue, or the like; specifically, for example, a sodium silicate sol forming a glass cement is injected into the cavity 313 and then cured. Or in still other implementations, the filler material may also include a powder, such as a glass frit, ceramic frit, or the like.

Or in a further variant, the cavity 313 of the substrate 31 is also provided with:

a rod-like or tubular support member, around which the coil 32 is wound, whereby the support member at least partially provides support within the coil 32. In this implementation, the support may comprise a ceramic rod or tube, a glass rod or tube, a rigid metal rod or tube, an organic polymer rod or tube, or the like.

Or in some implementations, the coil 32, formed by spiral winding of wire, itself has a certain mechanical strength, the coil 32 being sufficient to maintain its shape within the matrix 31. Then, or in yet other implementations, no other support members are within the base 31 to provide support for the coil 32.

And in some implementations, conductive leads 321 and/or 322 comprise conductive filaments of low resistivity metal or alloy; for example, conductive leads 321 and/or 322 include conductive wires made of gold, copper, silver, nickel, or the like, or alloys thereof. And, conductive leads 321 and/or 322 are elongate filar leads; conductive leads 321 and/or conductive leads 322 extend at least partially beyond ends 312; and, conductive leads 321 and/or 322 have a diameter of about 0.1-0.5 mm.

And in some implementations, conductive leads 321 and/or 322 may further comprise: a metal coating layer formed on the surface of the conductive wire or wire of the above metal or alloy; the coating layer may be formed by electroplating or the like. For example, in some implementations, the conductive leads 321 and/or 322 can be copper wire plated with nickel, copper wire plated with silver, nickel wire plated with silver, with nickel, etc., with at least one of the silver plating, the nickel plating, etc.; and in some implementations, the thickness of the metal cladding is typically less than 0.1mm. Conductive leads 321 and/or 322 with a surface metal coating are more efficient than LC oscillations of heater 30 when the leads without the metal coating are connected to circuit 20.

For example, fig. 5 to 7 show the results of the inductance value L, the Q-factor value, and the on-high frequency impedance R value measured by the automatic LCR tester of japanese national (HIOKI) model IM3536 for the heater 30 of the conductive leads 321 and/or 322 of three different materials. Wherein, in this particular test example, the coil 32 material was selected from a receptive ferritic SUS430 stainless steel with 9 turns, the length of the coil 32 was 10.5±0.5mm, the outer diameter was 1.75mm, the cross-section of the wire material of the coil 32 was 0.8mm in the axial direction and 0.25mm in the radial direction; the matrix 31 is an austenitic 304 stainless steel with very weak susceptibility.

The conductive leads 321 and 322 of the coil 32 corresponding to the curve S1a in fig. 5, the curve S1b in fig. 6, and the curve S1c in fig. 7 are made of nickel wires; the materials of the conductive leads 321 and 322 used for the coil 32 corresponding to the curve S2a in fig. 5, the curve S2b in fig. 6 and the curve S2c in fig. 7 are nickel wire surface silver plating; the conductive leads 321 and 322 of the coil 32 corresponding to the curves S3a, S3b and S3c in fig. 5 and 6 are silver plated on the surface of copper wire. According to the test results of fig. 5 to 7, in the frequency range of 200kHz to 2000kHz, the conductive leads 321 and 322, which are silver-plated on the surface of the copper wire, are used, and the heater 30 and/or the coil 32 have a relatively high quality factor Q value, as well as a low inductance value L and a low high-frequency impedance R in practice. And according to the test results of fig. 5 to 7, the conductive leads 321 and 322 having silver plating have a relatively high quality factor Q value, and a low inductance value L and a low high frequency impedance R than the nickel wire without plating in the frequency band range of 200kHz to 2000 kHz.

In still other implementations, the heater 30 has relatively lower power consumption in use with the conductive leads 321 and 322 having surface metallization.

Specifically: for example, fig. 8 shows a schematic diagram of a heating profile of an aerosol-generating article 1000 over a predetermined time in one embodiment. In some implementations, the heating profile is heated for a predetermined time; wherein the predetermined time is set based on the amount of aerosol that the aerosol-generating article 1000 is capable of generating, and the length of time the user is willing to accept to draw (e.g., about 4 minutes). For example, the heating profile of fig. 8, the heating process includes:

first stage S1 (time 0-t1, about 10S): quickly heating from room temperature to a first preset temperature T1 for preheating;

the second stage S2 (time t1-t2, about 5S): decreasing from the first preset temperature T1 to a second preset temperature T2;

the third stage S3 (time t2-t3 or end, about 240S): the aerosol-generating article 1000 is heated to generate an aerosol for inhalation substantially maintained at the second preset temperature T2; after the suction is completed, the power supply to the heater 30 is stopped, and the air is cooled.

In one specific implementation, the coil 32 of the heater 30 is made of SUS430 stainless steel, and the conductive leads 321 and 322 are welded at both ends, and the aerosol-generating article 1000 is heated at the same time and in the same manner according to the heating curve of fig. 8, until the total power output by the battery cell 10 is calculated after the heating is completed. For conductive leads 321 and 322 of different materials, the measured total output power of heater 30 to heat aerosol-generating article 1000 to the completed puff of cell 10 is as follows:

According to the test result, the power consumption of the conductive lead 321 and the conductive lead 322 which adopt pure nickel wires is relatively high at the relatively low preheating temperature T1 and the pumping temperature T2, and the power consumption of the lead which adopts the silver coating on the surface is relatively low at the relatively high preheating temperature T1 and the pumping temperature T2; conductive leads 321 and 322 with surface metal cladding are advantageous for reducing power consumption.

Further, fig. 9 to 10 show the results of the inductance value L and the quality factor Q value measured by the heater 30 in the automatic LCR tester of japanese lay-up (HIOKI) model IM3536, respectively, in which the wire materials of the coil 32 in the heater 30 have different extension sizes in the radial direction. In the specific test implementation, the coil 32 is made of SUS430 stainless steel with material selection sensitivity, the number of turns is 12, the length of the coil 32 is 10.5+/-0.5 mm, and the outer diameter is 1.6mm; the substrate 31 is made of austenitic 304 stainless steel with extremely low sensitivity, the outer diameter of the substrate 31 is 2.2mm, and the wall thickness is 0.15mm; the conductive leads 321 and 322 are silver-plated copper wire surfaces.

The wire material of the coil 32 corresponding to the curve S1d in fig. 9 and the curve S1e in fig. 10 has an extension dimension in the axial direction of 0.8mm and an extension dimension in the radial direction of 0.1mm; the wire material of the coil 32 corresponding to the curve S2d in fig. 9 and the curve S2e in fig. 10 has an extension of 0.8mm in the axial direction and an extension of 0.2mm in the radial direction. According to the fig. 9 and 10, when the extension dimension of the wire material of the coil 32 in the radial direction is increased from 0.1mm to 0.2mm, the Q value is correspondingly increased from about 0.42 to 1.0 or more in the range of 200 to 800kHz band. Further, in the above optional range, the extending dimension of the wire material of the coil 32 in the radial direction is as large as possible within a suitable range as possible, which is advantageous in terms of improving efficiency.

Further, fig. 11 to 12 show the results of the inductance value L and the quality factor Q value measured by the heater 30 in the automatic LCR tester of japanese lay-up (HIOKI) model IM3536, respectively, in which the wire materials of the coil 32 in the heater 30 have different extension sizes in the radial direction. In the specific test implementation, the coil 32 is made of ferrite SUS430 stainless steel with selective sensitivity, the number of turns is 9, the length of the coil 32 is 9.0+/-0.5 mm, and the outer diameter is 1.6mm; the matrix 31 is an austenitic 304 stainless steel with extremely low sensitivity, the outer diameter of the matrix 31 is 2.2mm, and the wall thickness is 0.15mm; the conductive leads 321 and 322 are silver-plated copper wire surfaces.

The wire material of the coil 32 corresponding to the curve S1f in fig. 11 and the curve S1g in fig. 12 has an extension dimension in the axial direction of 0.8mm and an extension dimension in the radial direction of 0.2mm; the wire material of the coil 32 corresponding to the curve S2f in fig. 11 and the curve S2g in fig. 12 has an extension dimension in the axial direction of 0.8mm and an extension dimension in the radial direction of 0.25mm. According to the fig. 11 and 12, when the extension dimension of the wire material of the coil 32 in the radial direction is increased from 0.2mm to 0.25mm, the Q value is correspondingly increased in the range of 200 to 1800kHz band.

Further, fig. 13 to 14 show the results of the inductance value L and the quality factor Q value measured by the heater 30 in the automatic LCR tester of japanese lay-up (HIOKI) model IM3536, respectively, in which the wire materials of the coil 32 in the heater 30 have different extension sizes in the radial direction. In the specific test implementation, the coil 32 is made of SUS430 stainless steel with material selection sensitivity, the number of turns is 9, the length of the coil 32 is 9.0+/-0.5 mm, and the outer diameter is 1.8mm; the matrix 31 is a 304 stainless steel metal shell with extremely low sensibility, the outer diameter of the matrix 31 is 2.2mm, and the wall thickness is 0.15mm; the conductive leads 321 and 322 are silver-plated copper wire surfaces.

The wire material of the coil 32 corresponding to the curve S1h in fig. 13 and the curve S1i in fig. 14 has an extension dimension in the axial direction of 0.8mm and an extension dimension in the radial direction of 0.25mm; the wire material of the coil 32 corresponding to the curve S2h in fig. 13 and the curve S2i in fig. 14 has an extension dimension in the axial direction of 0.8mm and an extension dimension in the radial direction of 0.30mm. According to the embodiment shown in fig. 13 and 14, when the extension dimension of the wire material of the coil 32 in the radial direction is increased from 0.25mm to 0.30mm, the Q value is correspondingly increased in the range of 200 to 1800kHz band.

Further, fig. 15 to 16 show results of inductance L and quality factor Q measured by an automatic LCR tester of japanese daily-laid-open (HIOKI) model IM3536 of the heater 30 when the coils 32 in the heater 30 have different outer diameter sizes, respectively. In the specific test implementation, the coil 32 is made of SUS430 stainless steel with material selection sensitivity, the number of turns is 9, and the length of the coil 32 is 9.0+/-0.5 mm; the matrix 31 is a 304 stainless steel metal shell with extremely low sensibility, the outer diameter of the matrix 31 is 2.2mm, and the wall thickness is 0.15mm; the conductive leads 321 and 322 are silver-plated copper wire surfaces. And, the wire material of the coil 32 has an extension dimension in the axial direction of 0.8mm and an extension dimension in the radial direction of 0.25mm.

The outer diameter of the coil 32 corresponding to the curve S1j in fig. 15 and the curve S1k in fig. 16 is 1.65mm; the outer diameter of the coil 32 corresponding to the curve S2j in fig. 15 and the curve S2k in fig. 16 is 1.75mm; the outer diameter of the coil 32 corresponding to the curve S3j in fig. 15 and the curve S3k in fig. 16 is 1.80mm. According to the fig. 15 and 16, when the outer diameter of the coil 32 is increased from 165mm to 1.80mm, the Q value exhibits a tendency to increase and decrease in the range of 200 to 2000kHz band.

In some implementations, a relative increase in the outer diameter of the coil 32, for example greater than 1.75mm, is advantageous for lifting the centering of the coil 32 within the base 31 during assembly. Further, in practice, it is preferable to use 1.75mm to 1.80mm for the outer diameter of the coil 32, in combination with both the centering and Q values.

And further referring to fig. 2 and 3, the heater 30 further includes:

thermocouple wires 331 and 332 connected to both ends of the coil 32, respectively; for example, the thermocouple wire 331 is connected to the end of the coil 32 toward or near the proximal end 311 by welding or the like, and the thermocouple wire 332 is connected to the end of the coil 32 toward or near the distal end 312 by welding or the like.

In practice, thermocouple wire 331 and thermocouple wire 332 are made of two different materials of galvanic couple materials such as nickel, nickel-chromium alloy, nickel-silicon alloy, nickel-chromium-copper alloy, bronze and iron-chromium alloy; further, in use, a thermocouple operable to detect the temperature of the coil 32 is formed between the thermocouple wire 331 and the thermocouple wire 332, thereby obtaining the temperature of the coil 32 and/or the heater 30. For example, in some implementations, thermocouple wire 331 is a nickel-chromium material and acts as the positive terminal, and thermocouple wire 332 is a nickel-silicon material and acts as the negative terminal, forming a K-type thermocouple therebetween. In still other or alternative implementations, thermocouple wires 331 and 332 may be substituted for other materials to form a j-type thermocouple therebetween.

And in practice, thermocouple wire 331 and/or thermocouple wire 332 have a diameter of about 0.1-0.5 mm. For example, in one specific implementation, thermocouple wire 331 and/or thermocouple wire 332 have a diameter of 0.3 mm.

One embodiment of the present application proposes an aerosol-generating device 100 for heating, rather than burning, an aerosol-generating article 1000, such as a cigarette, thereby volatilizing or releasing at least one component of the aerosol-generating article 1000 to form an aerosol for inhalation, such as shown in fig. 17.

The configuration of the aerosol-generating device according to one embodiment of the present application may be seen in fig. 1, the overall device shape being generally configured in a flat cylindrical shape, the external components of the aerosol-generating device 100 comprising:

a housing 10 having a hollow structure inside and forming an assembly space for necessary functional components such as an electronic device and a heating device; the housing 10 has longitudinally opposed proximal 110 and distal 120 ends; wherein,

the proximal end 110 is provided with an opening 111 through which opening 111 the aerosol-generating article 1000 may be received within the housing 10 to be heated or removed from the housing 10;

the distal end 120 is provided with an air inlet hole 121; the air intake holes 121 serve to allow outside air to enter into the case 10 during the suction.

Further referring to fig. 1, the aerosol-generating device 100 further comprises:

a chamber for receiving or housing the aerosol-generating article 1000; in use, the aerosol-generating article 1000 may be removably received within the chamber through the opening 111.

And as shown in fig. 1, the aerosol-generating device 100 further comprises:

an air passage 150 between the chamber and the air inlet 121; in turn, in use, the air channel 150 provides a channel path from the air inlet 121 into the chamber/aerosol-generating article 1000, as indicated by arrow R11 in fig. 1.

a battery cell 130 for supplying power; preferably, the battery cell 130 is a rechargeable battery cell 130 and can be charged by being connected to an external power source;

the circuit 140 is disposed on a circuit board such as a PCB board or the like.

the heater 30 at least partially surrounds and defines a chamber, and when the aerosol-generating article 1000 is received within the housing 10, the heater 30 at least partially surrounds or encloses the aerosol-generating article 1000 and heats from the periphery of the aerosol-generating article 1000. And is at least partially received and retained within the heater 30 when the aerosol-generating article 1000 is received within the housing 10.

In practice, the heater 30 is supplied to the heater 30 by converting the direct current output from the battery cell 130 into an alternating current by the circuit 140. The heater 30 is configured in a substantially elongated tubular shape.

And further referring to fig. 17, the heater 30 includes:

at least one or more substrates 31, the substrates 31 being thermally conductive; and, the substrate 31 at least partially surrounds or defines a chamber; in some embodiments, the substrate 31 has a wall thickness of about 0.05-1 mm; and the base 31 has an inner diameter of about 5.0 to 8.0 mm; and the substrate 31 has a length of about 30 to 60 mm.

At least one or more coils 32 arranged around at least part of the substrate 31; coil 32 is a conventional solenoid coil; the coil 32 comprises an electrically conductive magnetic material, with both ends being connected or coupled to the circuit 140 by electrically conductive leads. And is configured to cause the coil 32 of electrically conductive magnetic material to heat up due to joule heating when an AC drive current provided by the circuit 140 is passed through the coil 32.

And in this implementation, the coil 32 has a length of about 30-60 mm.

And in some implementations, coils 32 of a conductive magnetic material, such as a ferromagnetic or ferrimagnetic material. In some implementations, at least a portion of the coil 32 of electrically conductive magnetic material may be made of at least one of ferromagnetic or ferrimagnetic material: nickel cobalt iron alloys (such as, for example, kovar or iron nickel cobalt alloy 1), armoium iron, permalloy (such as, for example, permalloy C), or ferritic or martensitic stainless steels. Or in still other implementations, the coil 32 of electrically conductive magnetic material includes a magnetic conductor material having a curie temperature of not less than 450 ℃, such as SUS430 stainless steel, iron-aluminum alloy, iron-nickel alloy, and the like.

And in some implementations, the cross-sectional shape of the wire material of the coil 32 configured in the form of a solenoid is a shape other than a conventional circle in accordance with the embodiment shown in fig. 17. In the embodiment shown in fig. 2 and 3, the cross-section of the wire material of the coil 32 has a dimension extending in the axial direction that is greater than a dimension extending in the radial direction, so that the cross-section of the wire material of the coil 32 takes on a flat rectangular shape.

In an embodiment, the substrate 31 is made of a thermally conductive material and is insulating; including for example ceramics, glass, surface insulating metals such as surface oxidized stainless steel, and the like. And, when the substrate 31 comprises a metal or alloy, the substrate 31 is substantially non-receptive, or weakly receptive, e.g., grade 304 stainless steel, and not strongly receptive grade 430/420 stainless steel. The substrate 31 itself is substantially free of or generates heat or generates less inductively heat. The substrate 31 generates heat less inductively, meaning that the substrate 31 of metal or alloy is used, and the hysteresis eddy current heat generated by the substrate 31 itself is significantly less than the heat transferred by the coil 32 when an AC drive current flows through the coil 32. Or more certainly, the base 31 is less inductively heated, meaning that the base 31 of metal or alloy is employed, and the hysteresis eddy current heat generated by the base 31 itself is less than 20% or less of the heat transferred from the coil 32 when an AC driving current flows through the coil 32.

The substrate 31 is not a strong receptive metal or alloy. Alternatively, the weakly sensitive matrix 31 means that the magnetic metal such as iron or the like in the matrix 31 may exist in an austenitic form rather than a ferritic form; such as austenitic stainless steel, e.g., 304 stainless steel, 321 stainless steel, 316 stainless steel, etc.

In practice, the substrate 31 heats the aerosol-generating article 1000 primarily by receiving or transmitting heat from the coil 32. Such that in use, the aerosol-generating article 1000 transfers heat through the substrate 31 and is thereby heated by the coil 32.

In still other variations, the number of substrates 31 may comprise one; and, the number of coils 32 may include at least two or more, and at least two or more coils 32 may be sequentially or alternately arranged in the longitudinal direction of the base 31; and, each of the coils 32 may surround or be bonded to only a portion of the base 31.

Or in still other implementations, the number of matrices 31 may include at least two or more; the number of coils 32 may include at least two or more; correspondingly, each base 31 may be surrounded by one or more coils 32.

And in some implementations, at least two or more coils 32 may be heated independently of each other.

And in some implementations, one of the at least two or more coils 32 heats up faster than the other one or more coils.

And in some implementations, one of the at least two or more coils 32 surrounds the at least two matrices 31 simultaneously. Or in yet other implementations, at least two or more coils 32 are simultaneously wrapped or wound around one substrate 31.

In still another embodiment, there is also provided a control method of an aerosol-generating device, as shown in fig. 18, the method comprising:

s10, the control circuit 20 supplies an AC driving current to the coil 32 so that the coil 32 is driven by the AC driving current to generate Joule heat to generate heat, and further heat the aerosol-generating article 1000;

s20, determining the temperature of the coil 32 by monitoring or sampling the thermoelectric voltage difference between the thermocouple wires 331 and 332; and adjusts or controls the frequency and/or duty cycle of the AC drive current provided to the coil 32 based on the determined temperature to maintain the operating temperature of the coil 32 below a preset temperature threshold.

In still other variant implementations, the frequency and/or duty cycle of the AC drive current provided to the coil 32 is controlled in accordance with a predetermined heating profile as shown in fig. 8, such that the coil 32 heats the aerosol-generating article 1000 in accordance with the predetermined heating profile.

In still other variant implementations, the preset temperature threshold is the highest temperature suitable for inhalation, which is advantageous for preventing volatilization of harmful substances of the aerosol-generating article 1000.

Or in some implementations, the preset temperature threshold may be set at 500 degrees. Or in some implementations, the preset temperature threshold may be near or less than the curie temperature of the coil 32; when the heating temperature reaches or exceeds the preset temperature threshold, it can be determined that the current temperature reaches the preset temperature threshold by monitoring the abrupt change in the voltage or current of the coil 32.

Or in some implementations, the circuit 20 stores a table of the temperature of the coil 32 against the thermoelectric voltage difference between the thermocouple wires 331 and 332, and the circuit 20 looks up the table based on the monitored or sampled thermoelectric voltage difference to determine the temperature of the coil 32.

And in some implementations, circuit 20 ceases or stops providing AC drive current to coil 32 when monitoring or sampling the thermoelectric voltage difference between thermocouple wire 331 and thermocouple wire 332. Or in some implementations, circuit 20 bypasses monitoring or sampling the thermoelectric voltage difference between thermocouple wire 331 and thermocouple wire 332 when providing AC drive current to coil 32.

Alternatively, circuit 20 monitors or samples the thermoelectric voltage difference between thermocouple wire 331 and thermocouple wire 332, as opposed to providing an AC drive current to coil 32.

It should be noted that the description and drawings of the present application show preferred embodiments of the present application, but are not limited to the embodiments described in the present application, and further, those skilled in the art can make modifications or changes according to the above description, and all such modifications and changes should fall within the scope of the appended claims.

Claims

1. An aerosol-generating device configured to heat an aerosol-generating article to generate an aerosol; characterized by comprising the following steps:

2. The aerosol-generating device of claim 1, wherein the heating coil is helically wound with a wire comprising an electrically conductive magnetic material.

3. The aerosol-generating device according to claim 1 or 2, wherein the curie temperature of the heating coil is not lower than 450 ℃.

4. Aerosol-generating device according to claim 1 or 2, characterized in that the heating coil comprises an electrically conductive ferromagnetic material or a ferrimagnetic material.

5. An aerosol-generating device according to claim 1 or 2, wherein the AC drive current has a frequency of from 80KHz to 2000KHz.

6. Aerosol-generating device according to claim 1 or 2, characterized in that the wire material of the heating coil has a cross-section which extends in the axial direction which is larger than the radial direction.

7. The aerosol-generating device of claim 6, wherein the cross-section of the wire material of the heating coil has a dimension extending in the axial direction of between 0.5 and 2.0mm;

8. The aerosol-generating device according to claim 1 or 2, wherein the heating coil comprises 6 to 18 turns.

9. The aerosol-generating device according to claim 1 or 2, further comprising:

10. The aerosol-generating device of claim 9, wherein the heating coil is non-contact with the aerosol-generating article.

11. The aerosol-generating device of claim 9, wherein the substrate is non-receptive or weakly receptive.

12. The aerosol generating device of claim 9, wherein the substrate itself generates substantially no or less heat when the circuit provides AC drive current to the heating coil.

13. The aerosol-generating device of claim 9, further comprising:

a chamber for receiving at least a portion of an aerosol-generating article;

the heating coil is isolated from the chamber by the substrate.

14. The aerosol-generating device of claim 13, wherein the heating coil is not exposed to the chamber.

15. The aerosol-generating device of claim 9, further comprising:

a chamber for receiving at least a portion of an aerosol-generating article;

The base has an axially extending cavity, and the heating coil is retained within the cavity of the base.

16. The aerosol-generating device of claim 9, further comprising:

a chamber for receiving at least a portion of an aerosol-generating article;

the substrate is arranged to at least partially surround or define the chamber;

the heating coil is arranged to surround at least a portion of the substrate.

17. The aerosol-generating device according to claim 1 or 2, further comprising:

a conductive lead for guiding an electric current between the electric circuit and the heating coil; the conductive lead includes:

18. The aerosol-generating device according to claim 1 or 2, further comprising:

19. The aerosol-generating device according to claim 1 or 2, further comprising:

the circuit is configured to determine a temperature of the heating coil by acquiring a thermoelectric voltage difference between the first thermocouple wire and the second thermocouple wire.

20. The aerosol-generating device of claim 19, wherein the circuit is configured to discontinue or stop providing the AC drive current to the heating coil when a thermoelectric potential difference between the first thermocouple wire and the second thermocouple wire is acquired; and/or the circuit is configured to cause the acquisition of the thermal potential difference to be performed at a time different from the supply of the AC drive current to the heating coil.

21. The aerosol-generating device of claim 9, wherein the substrate comprises at least one of a ceramic, a glass, a non-receptive metal or alloy, a less-receptive metal or alloy.

22. The aerosol-generating device of claim 9, wherein the heating coil comprises ferritic stainless steel;

and/or the substrate comprises austenitic stainless steel.

23. The aerosol-generating device according to claim 9, wherein the substrate has a thermal conductivity of 1 to 200W/m.k.

24. A heater for an aerosol-generating device comprising free front and rear ends facing away from each other in a length direction, and:

25. A heater for an aerosol-generating device, comprising:

26. A control method of an aerosol-generating device; the aerosol-generating device is configured to heat an aerosol-generating article to generate an aerosol and comprises:

characterized in that the method comprises:

27. An aerosol-generating device configured to heat an aerosol-generating article to generate an aerosol; characterized by comprising the following steps:

a heating coil for heating the aerosol-generating article;

a first conductive lead connected to a first end of the heating coil;

a second conductive lead connected to a second end of the heating coil;

a circuit configured to power the heating coil through the first and second conductive leads; the circuit is further configured to determine a temperature of the heating coil by acquiring a thermoelectric voltage difference between the first thermocouple wire and the second thermocouple wire.

28. The aerosol-generating device of claim 27, wherein the circuitry is configured to provide an AC drive current to the heating coil through the first and second electrically conductive leads such that the heating coil is driven by the AC drive current to generate joule heat to generate heat.

29. The aerosol-generating device of claim 28, wherein the circuit is configured to discontinue or stop providing the AC drive current to the heating coil when a thermoelectric potential difference between the first thermocouple wire and the second thermocouple wire is acquired;

30. The aerosol-generating device of claim 28 or 29, wherein the circuitry is further configured to adjust the frequency and/or duty cycle of the AC drive current provided to the heating coil to maintain the temperature of the heating coil below a preset temperature threshold based on the determined temperature of the heating coil.

31. A heater for an aerosol-generating device comprising free front and rear ends facing away from each other in a length direction, and:

A first conductive lead connected to a first end of the heating coil;