Aerosol generation system and control method

Abstract

The present application provides an aerosol generation system and a control method. The aerosol generation system comprises: a susceptor for heating an aerosol-generating substrate to generate an aerosol; an LC oscillator comprising an induction coil and a capacitor, the LC oscillator being configured to guide an alternating current to flow through the induction coil, thereby driving the induction coil to supply energy to the susceptor so that the susceptor heats the aerosol-generating substrate; and a controller programmed to determine an alternating-current impedance of the susceptor by means of a resonance voltage of the LC oscillator, and further programmed to determine the temperature of the susceptor by means of the alternating-current impedance of the susceptor. According to the aerosol generation system, the working temperature of the susceptor is controlled by means of detecting the alternating-current impedance of the susceptor during operation.

Description

Aerosol-generating system and control method

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application No. 202411296360.0, filed on September 14, 2024, and entitled “Aerosol-generating system and control method”, the content of which is incorporated herein by reference in its entirety. TECHNICAL FIELD

[0003] The present application relates to the field of aerosol-generating technology, and in particular to an aerosol-generating system and a control method. BACKGROUND

[0004] Tobacco products, such as cigarettes, cigars, and the like, burn tobacco during use to produce tobacco smoke. Attempts have been made to provide products that release compounds without burning.

[0005] Examples of such products are heat-not-burn devices, which release compounds by heating, rather than burning, a material. For example, the material can be tobacco or other non-tobacco products, which can or can not contain nicotine. As another example, there are aerosol provision devices, such as so-called aerosol-generating systems. These devices typically contain a liquid, which is heated to cause it to vaporize, thereby producing an aerosol that can be inhaled. Known aerosol-generating systems induce a susceptor to heat up by controlling an inductive coil to generate a varying magnetic field, thereby heating a liquid to generate an aerosol, and detect the temperature of the susceptor using a sensor to feedback control the alternating current provided to the inductive coil. Alternatively, Chinese patent CN106163306A proposes to monitor the apparent ohmic resistance of a load consisting of a susceptor, an inductive coil, and a capacitor in LC resonance with the inductive coil, to determine the temperature of the susceptor. SUMMARY

[0006] One embodiment of the present application provides an aerosol-generating system, characterized by comprising:

[0007] a susceptor configured to heat an aerosol-generating substrate to generate an aerosol;

[0008] an LC oscillator comprising an inductive coil and a capacitor; the LC oscillator is configured to direct an alternating current to flow through the inductive coil, thereby driving the inductive coil to provide energy to the susceptor to heat the aerosol-generating substrate;

[0009] a controller programmed to determine an AC impedance of the susceptor from a resonant voltage of the LC oscillator, and further programmed to determine a temperature of the susceptor from the AC impedance of the susceptor.

[0010] In some embodiments, the controller is programmed to perform a noise reduction filtering process on the sampling signal based on the resonant voltage of the LC oscillator to obtain a filtered signal, and obtain the resonant voltage of the LC oscillator according to the filtered signal.

[0011] In some embodiments, the sampling signal is obtained by sampling a shaped signal after shaping the resonant voltage of the LC oscillator.

[0012] In some embodiments, the shaping includes integral shaping.

[0013] In some embodiments, the controller is programmed to:

[0014] determine the total AC impedance in the entire circuit through the resonant voltage of the LC oscillator;

[0015] determine the AC impedance of the susceptor by subtracting the AC impedance of the rest of the circuit other than the susceptor from the total AC impedance.

[0016] In some embodiments, the controller is further programmed to prevent or interrupt the LC oscillator from directing the alternating current to flow through the induction coil when it is determined that the temperature of the susceptor exceeds a predetermined threshold. In some embodiments, the predetermined threshold can be 350℃.

[0017] In some embodiments, the controller is further programmed to control the power provided to the LC oscillator according to the AC impedance of the susceptor, so as to keep the temperature of the susceptor below the predetermined threshold.

[0018] In some embodiments, the controller is further programmed to determine the puffing action of the user according to the decrease of the AC impedance of the susceptor.

[0019] In some embodiments, the controller is further programmed to:

[0020] control the operating power of the susceptor according to the AC impedance of the susceptor, so as to keep the operating power of the susceptor at a predetermined power value.

[0021] In some embodiments, further comprising:

[0022] a battery for supplying power to the LC oscillator;

[0023] a main circuit switch connected between the battery and the LC oscillator;

[0024] the controller controls the operating power of the susceptor by controlling the frequency or duty cycle of the conduction of the main circuit switch.

[0025] In some embodiments, the controller is further programmed to:

[0026] The working power of the susceptor is determined according to the AC impedance of the susceptor, and the energy provided to the susceptor is controlled according to the working power of the susceptor, so that the energy value provided to the susceptor within a predetermined time is maintained at a preset energy value.

[0027] Yet another embodiment of the present application also provides an aerosol-generating system, comprising:

[0028] a susceptor for heating an aerosol-generating substrate to generate an aerosol;

[0029] an LC oscillator comprising an inductive coil and a capacitor; the LC oscillator is configured to direct an alternating current to flow through the inductive coil, thereby driving the inductive coil to provide energy to the susceptor to heat the aerosol-generating substrate;

[0030] a controller programmed to determine the AC impedance of the susceptor through the resonant voltage of the LC oscillator, and further programmed to control the working power of the susceptor according to the AC impedance of the susceptor, so that the working power of the susceptor is maintained at a predetermined power value.

[0031] Yet another embodiment of the present application also provides a control method of an aerosol-generating system, the aerosol-generating system comprising:

[0032] a susceptor for heating an aerosol-generating substrate to generate an aerosol;

[0033] an LC oscillator comprising an inductive coil and a capacitor; the LC oscillator is configured to direct an alternating current to flow through the inductive coil, thereby driving the inductive coil to provide energy to the susceptor to heat the aerosol-generating substrate;

[0034] The method comprises:

[0035] determining the AC impedance of the susceptor through the resonant voltage of the LC oscillator, and determining the temperature of the susceptor through the AC impedance of the susceptor.

[0036] Yet another embodiment of the present application also provides a control method of an aerosol-generating system, the aerosol-generating system comprising:

[0037] a susceptor for heating an aerosol-generating substrate to generate an aerosol;

[0038] an LC oscillator comprising an inductive coil and a capacitor; the LC oscillator is configured to direct an alternating current to flow through the inductive coil, thereby driving the inductive coil to provide energy to the susceptor to heat the aerosol-generating substrate;

[0039] The method comprises:

[0040] The AC impedance of the susceptor is determined by the resonant voltage of the LC oscillator, and the working power of the susceptor is controlled according to the AC impedance of the susceptor, so that the working power of the susceptor is kept at a predetermined power value.

[0041] In the above aerosol generating system, the working temperature of the susceptor is controlled by detecting the AC impedance of the susceptor when the susceptor is working. BRIEF DESCRIPTION OF DRAWINGS

[0042] One or more embodiments are illustrated by way of example in the figures that form a part of this patent document. These example embodiments demonstrate, but do not limit, the scope of the embodiments. Like reference numerals in the figures indicate like elements, and embodiments are not limited to the specific examples presented. The figures are not necessarily to scale, and the size of an element can be exaggerated to illustrate an embodiment.

[0043] Fig. 1 is a schematic view of an aerosol generating system according to an embodiment;

[0044] Fig. 2 is a schematic view of the aerosol generating system of Fig. 1 with a door cover of a heating device opened to remove or replace an aerosol generating article;

[0045] Fig. 3 is an exploded schematic view of the aerosol generating article of Fig. 2 from one perspective;

[0046] Fig. 4 is an exploded schematic view of the heating device of Fig. 2 from one perspective;

[0047] Fig. 5 is a schematic view of a cross section of the aerosol generating system of Fig. 1 from one perspective;

[0048] Fig. 6 is a schematic view of a cross section of the aerosol generating system of Fig. 1 from another perspective;

[0049] Fig. 7 is a schematic view of an aerosol generating system according to another embodiment;

[0050] Fig. 8 is a structural block diagram of a circuit arranged on a main circuit board according to an embodiment;

[0051] Fig. 9 is a schematic view of basic components of an embodiment of the circuit of Fig. 8;

[0052] Fig. 10 is a schematic view of a resonant voltage of an LC oscillator according to an embodiment;

[0053] Fig. 11 is a schematic view of a voltage shaping signal Vout output by the resonant voltage of the LC oscillator of Fig. 10 after being shaped by a voltage shaping module according to an embodiment;

[0054] Fig. 12 is a schematic view of a sampling signal and a filtered signal V 滤波 output by the sampling signal of Fig. 11 after being filtered by an MCU controller according to an embodiment;

[0055] Fig. 13 is a graph of a filtered signal V 滤波 the curve shown after 50 times reduction;

[0056] Fig. 14 is a graph of the AC impedance of a sensor detected during operation in one embodiment versus temperature. Embodiments of the invention

[0057] For the purposes of the present application, the present application will be described in greater detail below, by way of example, with reference to the drawings and specific embodiments.

[0058] One embodiment of the present application proposes an aerosol-generating system for heating an aerosol-generating article that is consumable to generate an aerosol.

[0059] In some embodiments, the aerosol-generating system can include a reusable heating device and a replaceable consumable, such as an aerosol-generating article. The replaceable consumable, such as the aerosol-generating article, is received or coupled to the reusable heating device to form the aerosol-generating system.

[0060] In some embodiments, the aerosol-generating article includes a solid aerosol-generating substrate, and the heating device generates an aerosol by heating the solid aerosol-generating substrate. For example, Figs. 1 and 2 show a schematic view of an aerosol-generating system according to one embodiment; in this embodiment, the aerosol-generating system includes:

[0061] an aerosol-generating article 200 as a replaceable consumable, and a heating device 100 that houses and receives the aerosol-generating article 200 and heats the aerosol-generating article 200.

[0062] In the embodiment shown in Figs. 1 and 2, the heating device 100 includes several components disposed within an outer housing (which can be referred to as a shell). The overall design of the outer housing can vary, and the version or configuration of the outer housing that defines the overall size and shape of the heating device 100 can vary. Generally, the elongate body can be formed from a single, unitary shell, or the elongate shell can be formed from two or more separable bodies. In some examples, all or only a portion of the outer housing can be formed from a metal or an alloy, such as stainless steel, aluminum, or other suitable materials including various plastics (e.g., polycarbonate), metal-plating over plastic, ceramic, and the like. In the embodiment shown in Figs. 1 and 2, the heating device 100 is substantially flat; the longitudinal length of the heating device 100 is greater than the width, which is greater than the thickness.

[0063] In some embodiments, the outer housing of the heating device 100 substantially defines the outer surface of the heating device 100; in the embodiment shown in Figs. 1 and 2, the heating device 100 includes:

[0064] The housing can comprise one or more reusable components; the housing has a proximal end 110 and a distal end 120 opposite in a longitudinal direction, a first side 130 and a second side 140 opposite in a width direction, and a front side 150 and a back side 160 opposite in a thickness direction.

[0065] In use, the proximal end 110 is configured as the end for a user to inhale aerosol, and a mouthpiece 111 is provided at the proximal end 110 for the user to inhale; and the distal end 120 is the end away from the user. The distal end 120 is arranged with a charging interface 121; the charging interface 121 is used to charge the heating device 100 and / or the battery 10 in the heating device 100. In some embodiments, the charging interface 121 is a USB Type-C interface; or in some other embodiments, the charging interface 121 can also be a USB 2.0, USB 3.0 or USB 4-pin interface.

[0066] In some embodiments, the mouthpiece 111 and the housing / second housing 180 are separately prepared and then assembled; and the mouthpiece 111 and the housing are detachably connected; so that in use, the mouthpiece 111 can be detached or removed from the housing; and airtight sealing can be achieved between them by a sealing ring such as an O-ring. Or in some other embodiments, the mouthpiece 111 and the housing / second housing 180 are integrally molded by moldable material, and they are not detachable or separable relative to each other.

[0067] In use, the front side 150 is the side for the user to operate the door cover 190, and then receive or take out the aerosol generating article 200; and the back side 160 is the side arranged with the induction coil 30.

[0068] According to FIG. 1 and FIG. 2, the housing of the heating device 100 comprises:

[0069] The first housing 170 is close to or defines the front side 150, and the second housing 180 is close to or defines the back side 160.

[0070] In the embodiments of FIG. 1 and FIG. 2, the heating device 100 and / or the housing of the heating device 100 is a longitudinally long cylindrical shape; and in the embodiments, the length of the heating device 100 and / or the housing of the heating device 100 is greater than the width, and the width is greater than the thickness, so that the heating device 100 and / or the housing of the heating device 100 is configured to be a flat shape.

[0071] In some embodiments, the length dimension of the heating device 100 and / or the housing of the heating device 100 is between 60-160 mm; and, the width dimension of the heating device 100 and / or the housing of the heating device 100 is between 22-50 mm; and, the thickness dimension of the heating device 100 and / or the housing of the heating device 100 is between 5-20 mm.

[0072] According to FIG. 2, the aerosol generating article 200 is generally configured in a shape of a sheet or a thin sheet; the sheet or thin sheet can be characterized in that a length of the aerosol generating article 200 is greater than or equal to a width, and the width is greater than a thickness by at least three times or at least five times.

[0073] Accordingly, the heating device 100 includes:

[0074] a receiving cavity 510 located within the housing; and, the receiving cavity 510 is substantially adapted to a shape of the aerosol generating article 200 for receiving the aerosol generating article 200. In some embodiments, the receiving cavity 510 has a length greater than or equal to a width, and the width is greater than a thickness; and, the receiving cavity 510 is arranged in a plane parallel to a longitudinal direction and a width direction of the heating device 100.

[0075] According to FIGS. 1 and 2, the receiving cavity 510 is defined with an opening 171 at the front side 150 of the housing. In embodiments, the opening 171 is formed or defined by the first housing 170 of the housing. In use, the aerosol generating article 200 can be removably received within the receiving cavity 510 or removed by the opening 171.

[0076] According to FIGS. 1 and 2, the heating device 100 further includes:

[0077] a movable door cover 190 movably coupled to the housing of the heating device 100 and movable relative to the housing to selectively move between an open position and a closed position; the door cover 190, in the open position, opens the opening 171 to enable a user to operate to removably receive or remove the aerosol generating article 200 within the receiving cavity 510; the door cover 190, in the closed position, blocks and closes the opening 171 to prevent the user from being able to operate to removably receive or remove the aerosol generating article 200 within the receiving cavity 510.

[0078] According to FIG. 1, FIG. 2 and FIG. 4, the second housing 180 of the outer case is arranged with a pin shaft 181 arranged in a longitudinal direction at the first side 130; the door cover 190 is hinged with the outer case by the pin shaft 181 and can rotate around the pin shaft 181, as shown by the arrow R1 in FIG. 2. Further, the door cover 190 can be configured between an open position and a closed position by rotating to selectively open or close the opening 171. Alternatively, in some other variant embodiments, the pin shaft 181 can be arranged at the second side 140 of the outer case; the door cover 190 is rotationally connected with the outer case at the second side 140. Alternatively, in some other variant embodiments, the pin shaft 181 can be located on the door cover 190.

[0079] Alternatively, in some other variant embodiments, the door cover 190 is attached to the surface of the front side 150 of the first housing 170 and can be linearly moved relative to the first housing 170 in a longitudinal direction; and further configured between an open position and a closed position by moving to selectively open or close the opening 171.

[0080] According to FIG. 2 and FIG. 3, the aerosol generating article 200 includes a first end 210 and a second end 220 opposite to each other in a length direction. Further, the aerosol generating article 200 includes:

[0081] a first air inlet 251 and a second air inlet 252 isolated from each other, formed or defined at the second end 220;

[0082] a first air outlet 261 and a second air outlet 262 isolated from each other, formed or defined at the first end 210;

[0083] a first air passage R21 extending from the first air inlet 251 to the first air outlet 261, and a second air passage R22 extending from the second air inlet 252 to the second air outlet 262. The first air passage R21 and / or the second air passage R22 are arranged extending in the length direction of the aerosol generating article 200. The first air passage R21 and the second air passage R22 are isolated from each other. The first air passage R21 and / or the second air passage R22 are straightly extended.

[0084] According to FIG. 2 and FIG. 3, the aerosol generating article 200 includes:

[0085] An outer body 230 defining a closed volume is jointly defined by a cover plate 231 and a tray 232; specifically, the cover plate 231 and the tray 232 are bonded along a thickness direction of the aerosol generating article 200 to form or define the outer body 230 of the aerosol generating article 200. The tray 232 has at least one or more discrete or arrayed cavities disposed thereon. Specifically, the cavities include at least one or more first cavities 271 spaced apart along a longitudinal direction, and at least one or more second cavities 272 spaced apart along the longitudinal direction; the at least one or more first cavities 271 are disposed along the first air passage R21; the at least one or more second cavities 272 are disposed along the second air passage R22.

[0086] In some embodiments, the cover plate 231 and the tray 232 are fastened and bonded to each other by interference or tight fit. In some embodiments, the cover plate 231 and / or the tray 232 has a partitioning ridge 235 extending along a length direction from the first end 210 to the second end 220; when the cover plate 231 and the tray 232 are bonded to each other, the first air passage R21 and the second air passage R22 are partitioned by the partitioning ridge 235. In embodiments, the first air passage R21 and / or the first air inlet 251 and / or the first air outlet 261 are disposed on one side of the partitioning ridge 235, and the second air passage R22 and / or the second air inlet 252 and / or the second air outlet 262 are disposed on the other side of the partitioning ridge 235.

[0087] The cover plate 231 and the tray 232 further have a plurality of susceptors 241 and aerosol generating substrates 242 formed or bonded on the plurality of susceptors 241, respectively; the susceptors 241 can be penetrated by a varying magnetic field to generate heat, which in turn heats the aerosol generating substrates 242 bonded thereon to generate aerosol. The aerosol generating substrates 242 are sheet-like or block-like solid or gel.

[0088] In some embodiments, the susceptor 241 is sheet-like. The susceptor 241 has a thickness of about 0.03-1.0 mm. In more preferred embodiments, the susceptor 241 has a thickness of about 0.03-0.2 mm. In some specific embodiments, the susceptor 241 has a thickness of 0.26 mm.

[0089] In some embodiments, the aerosol generating substrate 242 is a continuous thin layer disposed on the susceptor 241; for example, the aerosol generating substrate 242 substantially completely covers at least one side surface of the susceptor 241. Or in yet other embodiments, the aerosol generating substrate 242 is formed on both side surfaces of the susceptor 241.

[0090] In some embodiments, the aerosol generating substrate 242 can be used to mean a substrate capable of releasing volatile compounds that can form an aerosol. The volatile compounds can be released by heating the aerosol generating substrate 242 to generate an aerosol. In some general embodiments, the aerosol generating substrate 242 is or can include a solid or a gel at room temperature.

[0091] In some embodiments, the aerosol generating substrate 242 can include one or more of a powder, a granule, a fragment, a fine strip, a strip, or a sheet of one or more of a vanilla leaf, a tobacco leaf, a homogenized tobacco, an expanded tobacco; or, the solid aerosol generating substrate 242 can contain additional volatile flavor compounds of tobacco or non-tobacco to be released when the substrate is heated.

[0092] In some embodiments, the aerosol generating substrate 242 can include an active base material; the active base material includes or is derived from one or more plant products or components thereof; for example, in some specific embodiments, the active base material includes a leaf, a bark, a fibrous tissue, a stem, a root, a petal, a fruit, etc. of a plant; for example, in one specific embodiment, the active base material includes or is derived from one or more plant varieties or components, derivatives, or extracts thereof, and the plant variety is tobacco. For example, in one specific embodiment, the active base material includes a mixture of plants such as tobacco and Chinese herbs. The active base material can include tobacco or tobacco-containing material; for example, the active base material can include any of the following: a tobacco leaf, a tobacco leaf vein fragment, a reconstituted tobacco, a homogenized tobacco, an extruded tobacco, a tobacco pulp, a cast leaf tobacco, and an expanded tobacco.

[0093] In some optional embodiments, the aerosol generating substrate 242 further includes: a flavorant; the flavorant can contain volatile flavor components. For example, in some general embodiments, the flavorant can provide a flavor selected from menthol, lemon, vanilla, orange, wintergreen, cherry, and cinnamon; the flavorant can include volatile tobacco flavor compounds that are released from the aerosol generating substrate 242 upon heating.

[0094] In some optional embodiments, the aerosol generating substrate 242 further includes: an aerosol former or a smoking agent; the aerosol former or the smoking agent aids in the formation of a dense and stable aerosol in use. In some specific embodiments, the aerosol former or the smoking agent is or includes at least one of glycerol, propylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, etc.

[0095] In some optional embodiments, the aerosol generating substrate 242 further includes: a binder; the binder promotes the bonding of the components in the aerosol generating substrate 242 in use; for example, in some specific embodiments, the binder is or includes at least one of gum arabic, casein, dextrin, sodium carboxymethyl cellulose, starch, polyvinyl alcohol, guar gum, etc.

[0096] In some alternative embodiments, the aerosol generating substrate 242 further comprises: reinforcing fibers; the fiber strength of the reinforcing fibers is generally higher than the fiber strength of the tobacco plant in the active base material, thereby enhancing the strength and plasticity of the aerosol generating substrate 242 in use. For example, in some specific embodiments, the reinforcing fibers include at least one of coniferous wood fibers, broadleaf wood fibers, hemp fibers or flax fibers, bamboo fibers, etc.

[0097] In one specific embodiment, the aerosol generating substrate 242 comprises: the active base material 65-90wt%, the reinforcing fibers 3-10wt%, the adhesive 0-5wt%, the flavorant 5-15wt%, the aerosol former or smoking agent 10-20wt%.

[0098] Or in yet another specific embodiment, the aerosol generating substrate 242 comprises: the active base material 65-90wt%, the reinforcing fibers 3-10wt%, the adhesive 1-5wt%, the flavorant 5-15wt%, the aerosol former or smoking agent 15-40wt%.

[0099] In some embodiments, the areal density of the aerosol generating substrate 242 is 20-150g / m 2 .

[0100] In some embodiments, the thickness of the aerosol generating substrate 242 is 0.1-0.6mm. And in some embodiments, the thickness of the aerosol generating substrate 242 is greater than the thickness of the susceptor 241.

[0101] In some embodiments, the water content in the aerosol generating substrate 242 is 6-14wt%.

[0102] In some embodiments, the aerosol generating substrate 242 can comprise a plurality of sub-layers; for example, in some alternative embodiments, the aerosol generating substrate 242 can comprise a first sub-layer and a second sub-layer in a laminated or layered arrangement. Wherein the first sub-layer can comprise the active base material, the reinforcing fibers, the aerosol former or smoking agent, etc.; the second sub-layer mainly comprises the flavorant. Then in use, the first sub-layer is used to generate the aerosol, and the second sub-layer is used to adjust or change the taste or flavor properties of the aerosol, etc.

[0103] Or in yet some embodiments, the aerosol generating substrate 242 with a plurality of sub-layers can comprise a first sub-layer and a second sub-layer in a laminated or layered arrangement. Wherein the first sub-layer can comprise the active base material, for example tobacco; the second sub-layer comprises the flavorant, and any one or several of the functional additives such as the moisture-proof agent, the mildew-proof agent, the antibacterial agent, etc. For example, the second sub-layer comprises the essence flavorant 0-20wt%, the adhesive 80-100wt%, the moisture-proof agent 0-0.2wt%, the mildew-proof agent 0-0.5wt%, the antibacterial agent 0-0.5wt%.

[0104] In this embodiment, the binder of the second sub-layer includes at least one of gum arabic, casein, dextrin, sodium carboxymethyl cellulose, starch, polyvinyl alcohol, guar gum; the moisture-proof agent can include at least one of dimethyl fumarate, anhydrous calcium chloride, super absorbent resin, etc.; the mildew-proof agent includes at least one of diphenyl, o-phenylphenol, 2-pyridine thiol-1-zinc oxide, ammonium persulfate, calcium phosphate, etc.; the antibacterial agent can use metal oxide or metal ion inorganic antibacterial agent, etc.

[0105] In yet some embodiments, the second sub-layer of the aerosol generating substrate 242 has a thickness of 0.001-0.1 mm; in preparation, the second sub-layer is coated on the susceptor 241 by spraying, brushing, film transfer, etc., and then the first sub-layer is combined on the surface of the second sub-layer by rolling or casting, etc., to form the multi-sub-layer aerosol generating substrate 242.

[0106] Or in yet some varied embodiments, the aerosol generating substrate 242 can include a gel and / or a paste. The gel can be defined as a substantially dilute cross-linked system that exhibits no flow when in the steady state. The paste can be defined as a viscous fluid such as a cream or a paste; for example, the paste can be a fluid that has a dynamic viscosity greater than 1 Pa·S or 5 Pa·S or 10 Pa·S when at rest.

[0107] In one embodiment, the aerosol generating substrate 242 and / or the susceptor 241 is arranged with an identifiable mark. The mark can be arranged to be an identifiable pattern; or in yet some varied embodiments, the mark is an identifiable color, a line, a number, a character, a two-dimensional code, etc. In some embodiments, the mark is used to provide an identifiable indication of the unique property of the aerosol generating article 200. The user or the heating device 100 identifies the mark to obtain the unique property of the aerosol generating article 200.

[0108] In some embodiments, the unique property of the aerosol generating article 200 includes various information of the aerosol generating article 200, such as authenticity information, expiration date, and place of origin. In some embodiments, the above various information of the aerosol generating article 200 can be obtained through the mark, so that it can be determined whether the aerosol generating article 200 is a genuine product, or when the aerosol generating article 200 has expired, and where the aerosol generating article 200 is manufactured. Therefore, the user can not inadvertently use an unauthentic aerosol generating article 200, an expired aerosol generating article 200, or an aerosol generating article 200 from an undesired source location.

[0109] In yet other embodiments, the unique property of the aerosol generating article 200 can include a taste of a flavor contained in the aerosol generating substrate 242, such as a honey peach taste, a mint taste, an orange taste.

[0110] For example, in some embodiments, the unique property of the aerosol generating article 200 can include an intensity of nicotine contained in the aerosol generating substrate 242, such as a content of nicotine.

[0111] In the embodiments shown in FIGS. 2 and 3, the susceptor 241 is rigid or hard. In some embodiments, the susceptor 241 is made of a susceptor metal or alloy; thus, in use, the susceptor 241 is heated by electromagnetic induction or penetration of a changing magnetic field, which in turn heats the aerosol generating substrate 242 to generate an aerosol. In some specific embodiments, the susceptor metal or alloy from which the susceptor 241 is made or formed is at least one of iron or an iron alloy, nickel or a nickel alloy, cobalt or a cobalt alloy, graphite, plain carbon steel, stainless steel, ferritic stainless steel, permalloy, etc. In some specific embodiments, the susceptor 241 includes permalloy with an alloy designation of 1J50 or 1J85; for example, the susceptor 241 made of permalloy has a mass percentage of iron ranging from 15 wt% to 85 wt%, and a mass percentage of nickel not more than 85 wt%.

[0112] Specifically according to FIGS. 2 and 3, the plurality of susceptors 241 are accommodated and retained in the plurality of first recesses 271 and the plurality of second recesses 272.

[0113] The plurality of aerosol generating substrates 242 located in the first recesses 271 are exposed to or located in the first air passage R21, and the generated aerosol is output from the first air passage R21 to the first air outlet 261; and the plurality of aerosol generating substrates 242 located in the second recesses 272 are exposed to or located in the second air passage R22, and the generated aerosol is output from the second air passage R22 to the second air outlet 262.

[0114] In some embodiments, the cover plate 231 and / or the tray 232 have a material with a low thermal conductivity, a low mass heat capacity, such as zirconia, glass, PEEK (polyether ether ketone), etc., and a long-term temperature resistance of not less than 250°C. Alternatively, in yet other varied embodiments, the cover plate 231 and / or the tray 232 include or are paper; for example, the cover plate 231 and / or the tray 232 include a fiber paper made of wood fibers, hemp fibers or flax fibers, bamboo fibers, etc.

[0115] In some embodiments, the susceptor 241 can be a dense sheet.

[0116] According to FIGS. 4 to 6, the heating device 100 further includes:

[0117] a power supply 10 arranged between the receiving cavity 510 and the distal end 120 for powering the heating device 100 and / or the induction coil 30;

[0118] a charging circuit board 23 arranged between the power supply 10 and the distal end 120; the charging circuit board 23 is provided with a charging IC (i.e. a charging management chip) for controlling charging of the power supply 10 through the charging interface 121;

[0119] a main circuit board 20 integrated with or arranged with a control circuit or an MCU controller; the main circuit board 20 comprises a first portion 21 and a second portion 22 arranged along the longitudinal direction; at least part of the second portion 22 is arranged between the power supply 10 and the rear side 160; the first portion 21 is at least partially arranged between the receiving cavity 510 and / or the induction coil 30 and the rear side 160.

[0120] In some embodiments, the charging circuit board 23 is connected to the second portion 22 of the main circuit board 20 through a conductive lead or a laminated conductive circuit, etc. In addition, the power supply 10 is abutted and connected to the second portion 22 of the main circuit board 20.

[0121] The first portion 21 of the main circuit board 20 is arranged with an MCU controller, etc. for controlling the provision of power to the induction coil 30. Alternatively, the first portion 21 of the main circuit board 20 is used to control the provision of power to the induction coil 30. Specifically, for example, the induction coil 30 comprises or is an induction coil 30; the first portion 21 of the main circuit board 20 is arranged with at least one inverter circuit for converting the direct current output by the power supply 10 into alternating current to provide to the at least one induction coil 30, so that the induction coil 30 generates a varying magnetic field. In some embodiments, the at least one inverter circuit comprises at least one capacitor, and the at least one capacitor is operable to form an LC oscillator with the at least one induction coil 30, and the oscillation of the LC oscillator forms the alternating current provided to the at least one induction coil 30.

[0122] According to FIGS. 2-6, the heating device 100 further comprises:

[0123] a first support 50 at least partially defining the receiving cavity 510, thereby accommodating and receiving the aerosol generating article 200; at least part of the first support 50 is arranged between the induction coil 30 and the front side 150. The first support 50 is at least partially concave in shape, thereby surrounding and defining the receiving cavity 510. In some embodiments, the first support 50 is made of a non-magnetic rigid material; for example, the first support 50 is made of a polymer plastic or a ceramic material, etc.

[0124] According to FIGS. 2-6, the mouthpiece 111 is hollow; the mouthpiece 111 has an air intake 113 at the proximal end 110; and, the mouthpiece 111 has an air outlet passage 112 arranged inside.

[0125] The air outlet passage 112 is in airflow communication with the receiving cavity 510 through the first air outlet communication port 513 and the second air outlet communication port 514 arranged on the first holder 50, and in turn outputs the aerosol to the air intake 113, as shown by the arrow R30 in FIG. 5. The first air outlet communication port 513 and the second air outlet communication port 514 are arranged on the side of the receiving cavity 510 facing the proximal end 110.

[0126] According to FIGS. 2-6, the first holder 50 further has a first air inlet communication port 515 and a second air inlet communication port 516 arranged on the other side facing the distal end 120, for supplying air into the receiving cavity 510 during puffing. According to FIGS. 2-5, the first side 130 of the housing is arranged with a first air inlet 131 for supplying external air into the receiving cavity 510 during puffing; and the second side 140 of the housing is arranged with a second air inlet 141. The first holder 50 further has an extension portion 52 extending towards the distal end 120 and / or the battery 10. In embodiments, the extension portion 52 is located between the receiving cavity 510 and the battery 10. In embodiments, the extension portion 52 is hollow and has at least one cavity inside.

[0127] According to FIGS. 2-6, the extension portion 52 of the first holder 50 further has:

[0128] a first air inlet passage R11 extending from the first air inlet 131 to the first air inlet communication port 515;

[0129] a second air inlet passage R12 extending from the second air inlet 141 to the second air inlet communication port 516.

[0130] According to FIGS. 5 and 6, when the aerosol generating article 200 is received in the receiving cavity 510 of the first holder 50, the first air inlet 251 of the second end 220 of the aerosol generating article 200 is aligned with and in airflow communication with the first air inlet communication port 515; and the second air inlet 252 of the second end 220 of the aerosol generating article 200 is aligned with and in airflow communication with the second air inlet communication port 515. According to FIG. 5, when the aerosol generating article 200 is received in the receiving cavity 510 of the first holder 50, the first air outlet 261 of the first end 210 of the aerosol generating article 200 is aligned with and in airflow communication with the first air outlet communication port 513; and the second air outlet 262 of the first end 210 of the aerosol generating article 200 is aligned with and in airflow communication with the second air outlet communication port 514.

[0131] Further, in use, a first airflow passage extending from the first air inlet 131 to the air suction port 113 is jointly defined by the first air inlet passage R11 of the first holder 50, the first air passage R21 of the aerosol generating article 200, and the air outlet passage 112 inside the mouthpiece 111. Further, the first airflow passage is through the aerosol generating article 200, and further serves to deliver the aerosol generated by the plurality of aerosol generating substrates 242 located in the first airflow passage to the air suction port 113. And in use, a second airflow passage extending from the second air inlet 141 to the air suction port 113 is jointly defined by the second air inlet passage R12 of the first holder 50, the second air passage R22 of the aerosol generating article 200, and the air outlet passage 112 inside the mouthpiece 111. Further, the second airflow passage is through the aerosol generating article 200, and further serves to deliver the aerosol generated by the plurality of aerosol generating substrates 242 located in the first airflow passage to the air suction port 113.

[0132] In embodiments, the first airflow passage is isolated from the second air passage R22 of the aerosol generating article 200; and the second airflow passage is isolated from the first air passage R21 of the aerosol generating article 200.

[0133] In terms of the connection and communication structure between the respective portions of the first airflow passage and / or the second airflow passage, the extension portion 52 of the first holder 50 is arranged with a first joint 521 extending towards the first side 130 in the width direction, and a second joint 522 extending towards the second side 140 in the width direction. The first joint 521 serves to airflow-communicate the first air inlet passage R11 with the first air inlet 131; and the second joint 522 serves to airflow-communicate the second air inlet passage R12 with the second air inlet 141.

[0134] According to FIGS. 4 to 6, the extension portion 52 is further arranged with a partition wall 53 extending towards the terminal end 530 and terminating at the terminal end 530, for isolating the first air inlet passage R11 and the second air inlet passage R12.

[0135] According to FIGS. 4 to 6, the heating device 100 further comprises:

[0136] At least one or more induction coils 30 arranged between the receiving cavity 510 and the rear side 160; the at least one or more induction coils 30 can be powered by the main circuit board 20. In the embodiments shown in FIGS. 4 to 7, the at least one or more induction coils 30 are configured to generate a varying magnetic field to heat the susceptor 241 of the aerosol generating article 200 by magnetic field induction. When the aerosol generating article 200 is received in the receiving cavity, the at least one or more induction coils 30 heat the aerosol generating article 200 by generating a magnetic field.

[0137] Specifically according to the embodiments shown in FIGS. 4-6, each of the plurality of induction coils 30 is respectively opposite each of the aerosol generating substrate 242 and / or susceptor 241 when the aerosol generating article 200 is received within the receiving cavity 510, whereby each induction coil 30 is capable of heating the opposite susceptor 241.

[0138] In the embodiments shown in FIGS. 4-6, the induction coils 30 are substantially planar. In embodiments, the induction coils 30 are configured as planar spiral coils. Also, the susceptor 241 is planar. When the aerosol generating article 200 is received within the receiving cavity, the induction coils 30 are substantially arranged in parallel with the susceptor 241. In FIGS. 4-6, the induction coils 30 and / or the susceptor 241 are circular in shape; or in yet other variant embodiments, the induction coils 30 and / or the susceptor 241 are square, oval, etc. in shape.

[0139] In some embodiments, the induction coils 30 are substantially arranged in parallel with the susceptor 241 when the aerosol generating article 200 is received within the receiving cavity. Also, the spacing between the induction coils 30 and the susceptor 241 is less than 15 mm; more preferably, the spacing between the induction coils 30 and the susceptor 241 is less than 10 mm. In some embodiments, the spacing between the induction coils 30 and the susceptor 241 is less than the diameter of the induction coils 30.

[0140] In some embodiments, at least one or more of the induction coils 30 are arranged discretely or in an array.

[0141] In some embodiments, at least one or more of the induction coils 30 can be independently connected to the first portion 21 of the main circuit board 20 and, in turn, can be independently powered by the main circuit board 20. For example, in some embodiments, a plurality of induction coils 30 are connected to the main circuit board 20 and, in turn, can be independently powered by the main circuit board 20 to independently generate magnetic fields by the plurality of induction coils 30 to individually initiate heating. For example, in some embodiments, the induction coils 30 are individually actuatable; such that each induction coil 30 can only individually heat an opposing susceptor 241 to, in turn, heat the aerosol- generating substrate 242 on the susceptor 241 to generate an aerosol. For another example, in some embodiments, the main circuit board 20 is configured or programmed to control the induction coils 30 to be sequentially actuated in a predetermined order, one after another. In some embodiments, the main circuit board 20 is configured or programmed to control the induction coils 30 to not be simultaneously actuated; such that, for example, the main circuit board 20 only controls one induction coil 30 to be actuated to generate an aerosol for one puff at a time. In some embodiments, in each puff, the main circuit board 20 controls one of the induction coils 30 to individually heat the aerosol-generating article 200 to generate a total particulate matter (TPM) of at least 1.5 mg, at least 1.7 mg, at least 2.0 mg, at least 2.5 mg, at least 3.0 mg, about 1.0 mg to about 5.0 mg, about 1.5 mg to about 4.0 mg, about 2.0 mg to about 4.0 mg, or about 2.0 mg to about 3.0 mg, at least 3 mg to about 7 mg, about 4 mg to about 8 mg, and about 5 mg to about 10 mg.

[0142] According to the embodiments shown in Figures 4 to 6, the plurality of induction coils 30 are substantially discretely arranged. The plurality of induction coils 30 are substantially all in the same plane.

[0143] In some embodiments, the main circuit board 20 controls a predetermined sequence of the plurality of induction coils 30 to be activated one after another in sequence during multiple puffs by a user. Specifically, as shown in Figs. 4-6, during a first puff by a user, the main circuit board 20 provides power to the first induction coil 30 closest to the left side from top to bottom to heat up, to heat up the opposing susceptor 241 and aerosol generating substrate 242 to generate aerosol for one puff; during a next puff by a user, the main circuit board 20 provides power to the second induction coil 30 closest to the left side from top to bottom to heat up, to heat up the opposing susceptor 241 and aerosol generating substrate 242 to generate aerosol for one puff; and so on, until all of the induction coils 30 are heated up, all of the aerosol generating substrate 242 in the aerosol generating article 200 is consumed, and the user is prompted to replace the aerosol generating article 200. In the above embodiments, activating the induction coils 30 one after another in sequence rather than all at the same time means that the aerosol generating substrate is minimally wasted and energy is saved. Alternatively, in other embodiments, the sequence in which the plurality of induction coils 30 are activated one after another in sequence is along the direction in which the plurality of induction coils 30 are arranged.

[0144] Alternatively, in other embodiments, the plurality of induction coils 30 are activated one after another in sequence by the main circuit board 20 without any gaps along the direction in which the plurality of induction coils 30 are arranged. Alternatively, in other embodiments, the plurality of induction coils 30 are activated one after another in sequence by the main circuit board 20 with gaps or jumps.

[0145] In some embodiments, the plurality of induction coils 30 are sequentially energized, i.e., energized once per puff by a user, so that aerosol is consistently generated per puff.

[0146] According to Figs. 2-6, the heating device 100 further comprises:

[0147] a second support 40 for receiving and supporting the induction coils 30. The second support 40 is arranged proximate to the rear side 160; or the second support 40 is located between the induction coils 30 and the second housing 180. Specifically, after assembly, the first support 50 and the second support 40 receive and hold the induction coils 30 therebetween.

[0148] According to FIGS. 2-6, the second support 40 is arranged with an annular protrusion 41 and an annular protrusion 42 toward the front side 150 and / or the surface of the first support 50. The annular protrusion 41 and the annular protrusion 42 define at least one or more accommodation cavities 43 therebetween. After assembly, the plurality of induction coils 30 are respectively accommodated and mounted in the plurality of accommodation cavities 43, and are respectively surrounded by the annular protrusion 41. The annular protrusion 41 is further arranged with a plurality of notches for the conductive leads of the induction coils 30 to pass through the notches to the outside of the annular protrusion 41, and then pass through the second support 40 to be connected to the main circuit board 20.

[0149] In some embodiments, the heating device 100 comprises:

[0150] An airflow sensor (not shown in the figure), such as a microphone or a MEMS sensor, is used to sense the user's puffing action. The main circuit board 20 sequentially supplies power to the plurality of induction coils 30 based on the sensing result of the airflow sensor. In a preferred implementation, the main circuit board 20 controls the plurality of induction coils 30 to be sequentially started in a predetermined order according to the user's puffing action. In another variation, the main circuit board 20 controls the plurality of induction coils 30 to be sequentially started at a predetermined interval; for example, the predetermined interval is between about 30 seconds and 300 seconds.

[0151] In some embodiments, the main circuit board 20 controls the plurality of induction coils 30 to be sequentially started in a predetermined order based on the removal or replacement of the aerosol generating article 200. Specifically, in some embodiments, when the main circuit board 20 controls the above induction coils 30 to be sequentially started, it prompts the user that the aerosol generating article 200 has been consumed, and prompts the user to replace a new aerosol generating article 200.

[0152] Alternatively, in some embodiments, when a new aerosol generating article 200 is detected to be received in the receiving cavity of the heating device 100, the induction coils 30 are sequentially started in a predetermined order again. The detection of the user replacing a new aerosol generating article 200 can be detected by a sensor; for example, the heating device 100 is provided with a light sensor or a pressure sensor, etc. to sense the aerosol generating article 200 being combined in or removed from the receiving cavity, and determine the replacement or consumption of the aerosol generating article 200 by the user according to the combination and removal.

[0153] In some embodiments, the main circuit board 20 controls the above induction coils 30 to sequentially activate in a cycle. For example, in some embodiments, the cycle is repeated for a predetermined number of times; for example, 6 times. Specifically, when the number of times the induction coils 30 are activated, and / or the number of puffs of the user, reaches the predetermined number, a new cycle is entered to control the induction coils 30 to sequentially activate. For another example, in some embodiments, the cycle is repeated upon removal or replacement of the aerosol generating article 200.

[0154] In some embodiments, the main circuit board 20 controls the plurality of induction coils 30 to generate magnetic fields to induce the opposing susceptors 241 to heat according to the same heating profile. For example, in some specific embodiments, the main circuit board 20 controls the plurality of induction coils 30 to generate magnetic fields to induce the opposing susceptors 241 to heat at a temperature of 300°C. Alternatively, in some other embodiments, the main circuit board 20 controls the plurality of induction coils 30 to induce the opposing susceptors 241 to heat according to different heating profiles or heating temperatures. For example, in some embodiments, the main circuit board 20 controls the plurality of induction coils 30 to induce the opposing susceptors 241 to heat at temperatures that increase or decrease sequentially along the order of heating activation.

[0155] For example, in some embodiments, the main circuit board 20 is configured to sequentially provide power to the induction coils 30 according to a given power sequence, such that the opposing susceptors 241 reach an operating temperature within a predetermined time. For example, each time the main circuit board 20 provides power to the induction coils 30, such that the opposing susceptors 241 reach a temperature of about at least 200 degrees, or at least 300 degrees, or at least 400 degrees, within 0.5 seconds, and maintain the temperature for a period of about 2.5 seconds before stopping.

[0156] In some embodiments, the induction coils 30 are spirally wound from a low-resistivity conductive wire material, for example, copper wire or silver wire, etc. In some embodiments, the wire material wound to form the induction coils 30 has a circular cross-sectional shape; or in some other embodiments, the wire material wound to form the induction coils 30 has a rectangular, elliptical, or triangular, etc. cross-sectional shape. In some embodiments, the wire material wound to form the induction coils 30 is a litz wire, having a plurality of or strands of conductive filaments.

[0157] Alternatively, in some other embodiments, the induction coils 30 are formed as tracks or lines on a planar substrate by printing or depositing or spraying, etc. For example, in some specific embodiments, the induction coils 30 are formed in the form of a thin layer by printing or depositing or spraying on a rigid or flexible electrically insulating substrate such as ceramic, glass, quartz, or PI film, etc.

[0158] In some embodiments, the susceptor 241 is opposite the induction coil 30 when the aerosol generating article 200 is received in the receiving cavity 510. More preferably or accurately, the center of the susceptor 241 is aligned with the center of the induction coil 30. In some embodiments, the susceptor 241 has the same shape as the induction coil 30.

[0159] In yet other embodiments, the aerosol generating system generates an aerosol by heating a liquid aerosol generating substrate; in some embodiments, the liquid aerosol generating substrate includes at least one of propylene glycol, glycerol, etc. For example, FIG. 7 shows a schematic diagram of an aerosol generating system of one embodiment, in which the aerosol generating system includes an atomizer 100a that atomizes a liquid aerosol generating substrate to generate an aerosol, and a power supply mechanism 200a that provides power to the atomizer 100a. As shown in FIG. 7, the power supply mechanism 200a includes:

[0160] a proximal end 2110a and a distal end 2120a that face away from each other in a longitudinal direction; in use, the proximal end 2110a is an end for receiving the atomizer 100a;

[0161] a receiving cavity 270a that is disposed adjacent to the proximal end 2110a and along a longitudinal extension of the power supply mechanism 200a; and, the receiving cavity 270a has an opening that faces or is located at the proximal end 2110a in the longitudinal direction; in use, the atomizer 100a can be received in or removed from the receiving cavity 270a through the opening;

[0162] a chargeable battery 10 / 10aa for outputting electric power; and, the battery 10 / 10aa is disposed proximate to the distal end 2120a;

[0163] a charging interface 240a for charging the chargeable battery 10 / 10aa; and, the charging interface 240a is disposed between the battery 10 / 10aa and the distal end 2120a;

[0164] an induction coil 30a for generating a varying magnetic field. The induction coil 30a is substantially in the form of a solenoid coil, and is disposed around the receiving cavity 270a.

[0165] According to FIG. 7, the power supply mechanism 200a further includes a main circuit board 220a that is integrated with or disposed on a circuit board, such as a PCB board or a FPC board, for controlling the operation of the power supply mechanism 200a, in particular, the main circuit board 220a controls the electric power output by the battery 10 / 10aa.

[0166] According to FIG. 7, the power supply mechanism 200a further includes:

[0167] An airflow sensor 250a, such as a microphone / MEMS sensor, etc., is arranged to sense the airflow through the atomizer 100a when a user puffs on the atomizer 100a, and the main circuit board 220a controls the power output by the battery 10 / 10aa based on the sensing result of the airflow sensor 250a. In the embodiment shown in FIG. 7, the airflow sensor 250a is arranged between the battery 10 / 10aa and the receiving cavity 270a. In yet other embodiments, the airflow sensor 250a can also be mounted or fastened or integrated on the circuit board on which the main circuit board 220a is arranged. Or in yet other embodiments, the airflow sensor 250a is supported and fixed within the power supply mechanism 200a by a separate support element, such as a plastic bracket, etc.

[0168] In the embodiment shown in FIG. 7, the power supply mechanism 200a is configured to induce the atomizer 100a to heat the liquid aerosol generating substrate by generating a varying magnetic field through the receiving cavity 270a. Specifically, a susceptor 241a can be arranged in the atomizer 100a, which can be penetrated by the varying magnetic field to heat up and thereby heat the liquid aerosol generating substrate to generate an aerosol when the atomizer 100a is received in the receiving cavity 270a.

[0169] According to the embodiment shown in FIG. 7, the atomizer 100a includes:

[0170] an outer body;

[0171] a liquid storage cavity 12a formed or defined in the outer body for storing the liquid aerosol generating substrate;

[0172] a susceptor 241a for heating the liquid aerosol generating substrate to generate an aerosol;

[0173] a liquid guide element 20a for transferring the liquid aerosol generating substrate between the liquid storage cavity 12a and the susceptor 241a, the liquid guide element 20a being configured to draw the liquid aerosol generating substrate and transfer or provide it to the susceptor 241a to heat up and generate an aerosol.

[0174] According to the embodiment shown in FIG. 7, a partition wall 11a is arranged in the outer body and extends in the longitudinal direction of the atomizer 100a. The partition wall 11a and the outer body define the liquid storage cavity 12a for storing the liquid aerosol generating substrate therebetween. Further, the partition wall 11a surrounds and defines an aerosol output channel in the outer body for outputting the aerosol to the air outlet 111a, as indicated by the arrow R12 in FIG. 7.

[0175] In the embodiment shown in FIG. 7, the liquid guide element 20a is configured to be located within the partition wall 11a; and in the embodiment shown in FIG. 7, the liquid guide element 20a is configured to be a hollow cylinder extending in the longitudinal direction. In some embodiments, the liquid guide element 20a is made of a capillary material or a porous material, such as a sponge, cotton fiber, or a porous body such as a porous ceramic body, etc. The outer surface of the liquid guide element 20a is configured as a liquid absorbing surface for absorbing the liquid aerosol generating substrate from the liquid storage cavity 12a, as shown by the arrow R11 in FIG. 7; in some specific embodiments, the partition wall 11a is provided with a plurality of perforations, and the outer surface of the liquid guide element 20a absorbs the liquid aerosol generating substrate in the liquid storage cavity 12a through the perforations. The inner surface of the liquid guide element 20a is configured as an atomizing surface; the susceptor 241a is combined to the inner surface of the liquid guide element 20a, and heats at least part of the liquid aerosol generating substrate in the liquid guide element 20a to generate an aerosol.

[0176] In yet other embodiments, the liquid guide element 20a can also be configured in various regular or irregular shapes, and is partially in fluid communication with the liquid storage cavity 12a to receive the liquid aerosol generating substrate. Alternatively, in other variant embodiments, the liquid guide element 20a can be more regular or irregular in shape, such as a polygonal block shape, a groove shape with grooves on the surface, or an arch shape with a hollow channel inside, etc.

[0177] Alternatively, in yet other variant embodiments, the susceptor 241a can be combined to the liquid guide element 20a by printing, deposition, sintering, or physical assembly, etc. In some other variant embodiments, the liquid guide element 20a can have a flat surface or a curved surface for supporting the susceptor 241a, and the susceptor 241a is formed on the flat surface or the curved surface of the porous liquid guide element 20a by means of mounting, printing, deposition, etc.

[0178] In the embodiment shown in FIG. 7, the susceptor 241a is an induction heating element that is capable of being heated by a varying magnetic field. The susceptor 241a is made of a metal or an alloy that is susceptible to induction heating, for example, the susceptor 241a can be made of stainless steel grade 430 (SS430), and can also be made of stainless steel grade 420 (SS420), and an alloy material containing iron and nickel, such as permalloy. In some specific embodiments, the susceptor 241a has a length of 2mm to 10mm; and the susceptor 241a has an inner diameter of 1.5mm to 8mm; and the tubular susceptor 241a has a wall thickness of 0.05mm to 0.2mm. For example, in some specific embodiments, the susceptor 241a has a length of 4mm to 8mm. As shown in FIG. 7, the susceptor 241a is in a tubular shape that is closed in the circumferential direction; and the susceptor 241a is in a mesh structure, and has a plurality of holes to make the susceptor 241a permeable to fluid; so that in use, the aerosol generated by heating is released or delivered to the air outlet 111a after passing through the susceptor 241a. Or in yet other embodiments, the susceptor 241a can be configured in the shape of a solenoid, or in the shape of a sheet, a cylinder, and the like.

[0179] In some embodiments, the induction coil 30a has an extension length of 6mm to 15mm; and the induction coil 30a has about 6 to 12 turns; the length of the susceptor 241a is less than the length of the induction coil 30a; and when the atomizer 100a is received in the receiving cavity 270a, the susceptor 241a is substantially completely located within the induction coil 30a.

[0180] FIGS. 8 and 9 show a schematic diagram of the circuit on the main circuit board 20 / 220a in an embodiment, in which the circuit on the main circuit board 20 / 220a includes:

[0181] an LC oscillator 222, which is formed by connecting the induction coil 30 / 30a with a capacitor;

[0182] a bridge 223, which is connected between the LC oscillator 222 and the battery 10 / 10a, for driving the LC oscillator 222 to oscillate, so as to form an alternating current flowing through the induction coil 30 / 30a.

[0183] In some embodiments, the LC oscillator 222 can be a series LC oscillator formed by connecting the induction coil 30 / 30a with at least one capacitor in series; or the LC oscillator 222 can be a parallel LC oscillator formed by connecting the induction coil 30 / 30a with at least one capacitor in parallel. Or in more embodiments, the LC oscillator 222 is an LC oscillator formed by connecting the induction coil 30 / 30a with at least two capacitors, for example, a commonly used symmetric half-bridge LC oscillator, also known as an LCC oscillator, and the like.

[0184] In the aerosol-generating system shown in FIG. 1 to FIG. 6, the heating device 100 includes a plurality of, for example, six, inductive coils 30; correspondingly, the main circuit board 20 includes a plurality of LC oscillators 222. Each LC oscillator 222 is composed of an inductive coil 30 and a capacitor. Each of the plurality of bridges 223 is connected between each LC oscillator 222 and the battery 10.

[0185] FIG. 9 shows a schematic diagram of the basic components of the main circuit board 20 / 220a of one specific embodiment, in which the LC oscillator 222 is a symmetrical half-bridge LC oscillator with two symmetrical bridge arms; specifically, in FIG. 9, the LC oscillator 222 includes:

[0186] a capacitor C1 and a capacitor C2 connected in series; wherein the first end of the capacitor C1 is connected to the positive pole of the battery 10 / 10a, and the second end is connected to the first end of the capacitor C2; the second end of the capacitor C2 is connected to the negative pole of the battery 10 / 10a through the ground; the second end of the capacitor C1 and the first end of the capacitor C2 are simultaneously connected to the second end of the inductive coil 30 / 30a.

[0187] In some embodiments, the capacitor C1 and / or the capacitor C2 can each include a plurality of capacitors connected in parallel. Using a plurality of capacitors connected in parallel to provide the capacitance of the capacitor C1 and / or the capacitor C2 can relatively reduce the capacitance requirement of each capacitor.

[0188] In the embodiment shown in FIG. 9, the bridge 223 is a half-bridge matched to the symmetrical half-bridge LC oscillator; specifically, in FIG. 9, the bridge 223, for example, a half-bridge, includes a switch tube Q1 and a switch tube Q2 connected in series; in the connection of FIG. 9, the first end of the switch tube Q1 is connected to the positive pole of the battery 10 / 10a, and the second end is connected to the first end of the inductive coil 30 / 30a; the first end of the switch tube Q2 is connected to the first end of the inductive coil 30 / 30a, and the second end is connected to the negative pole of the battery 10 / 10a through the ground. In addition, the conduction and disconnection of the switch tube Q1 and the switch tube Q2 are controlled by the PWM pulse signal emitted by the switch tube drive 225. The PWM pulse signal emitted by the switch tube drive 225 is generated by the MCU controller 224. Alternatively, in some other common variant embodiments, the bridge 223 can also use a full-bridge or H-bridge including four switch tubes. In the embodiment of FIG. 9, the MCU controller 224 drives the LC oscillator 222 to oscillate by controlling the alternating conduction and disconnection of the switch tube Q1 and the switch tube Q2, thereby forming an alternating current flowing through the inductive coil 30 / 30a, causing the inductive coil 30 / 30a to generate a varying magnetic field to induce the susceptor 241 / 241a to heat and generate aerosol.

[0189] Or in yet some embodiments, the LC oscillator 222 can also be an asymmetric half-bridge LC oscillator 222 including only the capacitor C2 and the inductive coil 30 / 30a in series, having only one oscillation bridge arm consisting of the capacitor C2 and the inductive coil 30 / 30a in series.

[0190] In some embodiments, the MCU controller 224 controls the switch tube driver 225 to modulate the PWM pulse signal to make the switch tube Q1 and the switch tube Q2 alternately turn on and off, so as to drive the LC oscillator 222 to oscillate to make the inductive coil 30 / 30a generate a varying magnetic field.

[0191] In the embodiment shown in FIG. 9, the circuit further includes a main circuit switch K1 electrically connected between the LC oscillator 222 and the battery 10 / 10a; specifically, the main circuit switch K1 is electrically connected between the LC oscillator 222 and the positive electrode of the battery 10 / 10a. By turning on and off the main circuit switch K1, the voltage output by the battery 10 / 10a is controlled; in turn, the power provided to the LC oscillator 222 is adjusted or controlled. The main circuit switch K1 is controlled to turn on and off by the PWM control signal issued by the MCU controller 224.

[0192] In some embodiments, the MCU controller 224 controls the power provided to the susceptor 241 / 241a to heat the susceptor 241 / 241a according to a predetermined heating curve. In a specific control, the MCU controller 224 controls the inductive coil 30 / 30a to provide power to the susceptor 241 / 241a through a magnetic field to heat the susceptor 241 / 241a according to the predetermined heating curve by controlling the duty cycle and / or frequency, etc. of the PWM control signal provided to the main circuit switch K1.

[0193] According to the embodiments shown in FIG. 8 and FIG. 9, the main circuit board 20 / 220a further includes:

[0194] The voltage shaping module 221 is configured to shape the resonance voltage of the LC oscillator 222 to facilitate the MCU controller 224 to sample and monitor the resonance voltage of the LC oscillator 222.

[0195] In the embodiment shown in FIG. 9, the voltage shaping module 221 includes a voltage dividing unit and a shaping unit.

[0196] The voltage dividing unit includes series-connected voltage dividing resistors R1, R2 and R3, and is connected to the second end of the induction coil 30 / 30a to divide the resonance voltage of the LC oscillator 222. In particular, in FIG. 9, the resonance voltage of the LC oscillator 222 is divided and scaled via the voltage dividing resistors R1, R2 and R3, and then output via the diode D1. The voltage dividing of the voltage dividing resistors R1, R2 and R3 is mainly to scale down the voltage value of about 30-50 volts to a range of about 0.05-5 volts, to prevent the signal voltage value from exceeding the sampleable range of a conventional I / O interface and being unable to be sampled or burning the I / O interface.

[0197] The shaping unit is used to shape the output signal of the voltage dividing unit; for example, in FIG. 9, the shaping unit is used to integrate shape the output signal of the voltage dividing unit. In FIG. 9, the shaping unit is a commonly used passive RC integration circuit, including a capacitor C3, a resistor R4 and a resistor R5. In some other alternative embodiments, the shaping unit can also use a commonly used active integration circuit or an integration operation chip. The voltage shaping signal Vout output via the shaping of the shaping unit is the integral of the output voltage of the voltage dividing unit with respect to time. In some other alternative embodiments, the shaping unit can also use other shaping circuits for shaping the sine / cosine waveform signal, to facilitate detection to obtain the resonance voltage of the LC oscillator 222.

[0198] In some embodiments, the MCU controller 224 can obtain the resonance voltage of the LC oscillator 222 by sampling the voltage shaping signal Vout output via the shaping of the shaping unit.

[0199] For example, FIG. 10 shows the waveform of the resonance voltage of the LC oscillator 222 in the case that the aerosol generating substrate on the susceptor 241 / 241a is sufficient during heating; the resonance voltage of the LC oscillator 222 is a sine waveform. In the case that the aerosol generating substrate is sufficient, the amplitude of the resonance voltage of the LC oscillator 222 is V1.

[0200] For example, FIG. 11 shows a schematic diagram of the voltage shaping signal Vout output after the voltage waveform of the resonance voltage of the LC oscillator 222 is shaped via the voltage shaping module 221; according to FIG. 11, after the voltage dividing and the integral shaping via the voltage shaping module 221, the voltage shaping signal Vout has the same period as the resonance voltage of the LC oscillator 222; and the amplitude V1a of the voltage shaping signal Vout output after the shaping is related to the amplitude V1 of the resonance voltage of the LC oscillator 222. Then the MCU controller 224 can monitor or determine the resonance voltage of the LC oscillator 222 by sampling the voltage shaping signal Vout output via the voltage shaping module 221.

[0201] In some embodiments, the voltage-shaped signal Vout of the resonant voltage after being shaped by the voltage shaping module 221 has a value between approximately 0.05 volts and 5 volts, which is advantageous for sampling and acquisition by the I / O interface of the MCU controller 224. Compared to directly sampling the original resonant voltage, which is as high as 30 volts to 50 volts, from the I / O interface of the MCU controller 224, sampling the voltage-shaped signal Vout will not damage the I / O interface or the MCU controller 224 due to excessive voltage. Furthermore, the voltage-shaped signal Vout of the resonant voltage is more suitable for sampling analysis and comparative calculations.

[0202] For example, Figure 12 shows the sampled signal V obtained by the MCU controller 224 sampling the voltage shaping signal Vout at a sampling frequency of 6ms / time, and the sampled signal V displayed on the oscilloscope after being connected. 采样 A schematic diagram; the sampled signal V displayed on the oscilloscope shown in Figure 12. 采样 It can be seen that the sampled signal obtained by the MCU controller 224 sampling the voltage shaping signal Vout at a sampling frequency of 6ms / time is relatively discrete and fluctuates.

[0203] To eliminate sampling errors and background signal-to-noise during the sampling process of the MCU controller 224, the MCU controller 224 is configured or programmed to use a software filtering algorithm to filter the sampled signal V. 采样 Filtering is performed; further, map 12 shows the filtered signal V generated after filtering. 滤波 A schematic diagram. The filtered signal V after noise reduction and background noise elimination processing in Figure 12. 滤波 The waveform curve after being further reduced by 50 times on the oscilloscope is shown in Figure 13; according to Figure 13, the sampled signal V... 采样 The filtered signal V generated after filtering to eliminate or reduce background signal-to-noise processing 滤波 This is relatively stable, which is advantageous for the MCU controller 224 to accurately monitor the resonant voltage of the LC oscillator 222. In some embodiments, the MCU controller 224 samples the signal V... 采样 The filtered signal V is generated by filtering to eliminate or reduce background signal-to-noise processing. 滤波 In some embodiments, the filtering algorithm for the sampled signal, for example, employs a recursive prediction filtering algorithm for the sampled signal V. 采样 Perform noise reduction filtering.

[0204] In some embodiments, the MCU controller 224 can determine the resonant voltage of the LC oscillator 222 and / or the induction coil 30 / 3a according to the voltage shaping signal Vout output by the voltage shaping module 221. Specifically, in the embodiment of the circuit shown in FIG. 9, the voltage shaping signal Vout satisfies the following formula 1 with the resonant voltage V of the LC oscillator 222 and / or the induction coil 30 / 3a: 谐振 In some embodiments, the MCU controller 224 can further be configured or programmed to determine the AC impedance Rsp of the susceptor 241 / 241a according to the resonant voltage of the LC oscillator 222.

[0205] 。

[0206] In the above formula 1, t is the working duration of the LC oscillator 222, Vd is the voltage drop of the diode D1 in the voltage shaping module 221, and other operation parameters are the resistance values and capacitance values of the resistance and capacitor devices in the voltage shaping module 221.

[0207] In some embodiments, the MCU controller 224 can further be configured or programmed to determine the AC impedance Rsp of the susceptor 241 / 241a according to the resonant voltage of the LC oscillator 222.

[0208] In some embodiments, determining the AC impedance Rsp of the susceptor 241 / 241a according to the resonant voltage of the LC oscillator 222 includes:

[0209] S11, calculating or determining the Q value (i.e., quality factor) of the LC oscillator 222 according to the resonant voltage of the LC oscillator 222. Specifically, the calculation formula 2 of the Q value is: Q = V 谐振 / (Vin x 0.707). In the formula 2, Vin is the supply voltage provided to the LC oscillator 222; when the LC oscillator 222 is directly connected to the battery cell 10 / 10a, Vin is the output voltage of the battery cell 10 / 10a; when the LC oscillator 222 is arranged with a boost circuit, a voltage stabilizing circuit, etc. with the battery cell 10 / 10a, Vin is the voltage value output by the boost or voltage stabilizing circuit to the LC oscillator 222.

[0210] S12, calculating or determining the total AC impedance Rst of the entire circuit including the LC oscillator 222 according to the Q value. The relevant formula 3 of the total AC impedance Rst of the entire circuit and the Q value is:

[0211] Q = 2 x π x f x Ls / Rst. In the formula 3, f is the given working frequency of the LC oscillator 222, and Ls is the actual inductance value of the induction coil 30 / 30a in working; Ls can be calculated by the relevant formula with the resonant frequency f. In some embodiments, the given working frequency of the LC oscillator 222 is usually the optimal resonant frequency, so that the LC oscillator 222 works in the optimal resonant state with the maximum efficiency.

[0212] S13, the AC impedance of the susceptor 241 / 241a Rsp is obtained by subtracting the AC impedance of the rest of the circuit except the susceptor 241 / 241a Rsd from the total AC impedance of the circuit Rst. That is, Rsp = Rst - Rsd.

[0213] wherein the AC impedance of the rest of the circuit except the susceptor 241 / 241a Rsd is known; in some embodiments, the AC impedance of the rest of the circuit except the susceptor 241 / 241a Rsd is measured and stored in the flash area of the MCU controller 224. The AC impedance of the rest of the circuit except the susceptor 241 / 241a Rsd is measured by coupling a susceptor 241 / 241a of a standard material, for example, 1J85 permalloy, to the induction coil 30 / 30a, and then detecting the total AC impedance of the circuit Rst using the above steps S10-S20, and subtracting the known AC impedance of the standard material, for example, 1J85 permalloy, from the total AC impedance of the circuit Rst.

[0214] Generally, in operation, the AC impedance of the susceptor 241 / 241a Rsp is typically 110-150 mOhm, and the total AC impedance of the circuit Rst and / or the AC impedance of the rest of the circuit except the susceptor 241 / 241a Rsd is several Ohm, for example, 3-8 Ohm.

[0215] In some embodiments, the MCU controller 224 is further configured or programmed to determine the temperature of the susceptor 241 / 241a based on the AC impedance of the susceptor 241 / 241a.

[0216] In some embodiments, in operation, the AC impedance of the susceptor 241 / 241a has a correlation with the temperature of the susceptor 241 / 241a. For example, FIG. 14 shows the AC impedance of a susceptor 241 / 241a made of stainless steel SS430 in operation and its correlation with the temperature in operation in one embodiment. As can be seen from the curve detected in FIG. 14, in the range of the temperature in operation, the AC impedance of the susceptor 241 / 241a is substantially monotonic with the temperature in operation, and a correlation table or a correlation equation can be obtained by fitting or correlation analysis. For example, the correlation equation of the AC impedance of the susceptor 241 / 241a and the temperature in operation T is Rsp = 113.86 + 0.1015 x T by fitting the correlation curve shown in FIG. 14.

[0217] In embodiments, the MCU controller 224 determines the temperature of the susceptor 241 / 241a based on the AC impedance of the susceptor 241 / 241a by looking up a table or calculation.

[0218] In some embodiments, the MCU controller 224 is further configured or programmed to control to stop or prevent the induction coil 30 / 30a from continuing to generate the magnetic field when it is determined that the temperature of the susceptor 241 / 241a exceeds a predetermined threshold, for example, 350°C; which is advantageous for preventing the susceptor 241 / 241a from burning dry or overheating.

[0219] In some embodiments, the MCU controller 224 is further configured or programmed to determine the puffing action of the user according to the decrease of the AC impedance of the susceptor 241 / 241a; or more specifically, determine the puffing action of the user according to the decrease of the AC impedance of the susceptor 241 / 241a exceeding a predetermined threshold. According to the embodiment shown in FIG. 14, it can be considered that there is a puffing action of the user when the decrease of the temperature of the susceptor 241 / 241a, for example, the decrease amplitude, caused by the user puffing the airflow carrying the heat output of the susceptor 241 / 241a; when the decrease of the temperature of the susceptor 241 / 241a, for example, the decrease amplitude, exceeds a predetermined threshold, the AC impedance of the susceptor 241 / 241a decreases accordingly, thereby determining the puffing action of the user.

[0220] In some embodiments, the MCU controller 224 is further configured or programmed to control the power provided to the LC oscillator 222 according to the AC impedance of the susceptor 241 / 241a, so as to keep the working power provided to the susceptor 241 / 241a at a predetermined power value. In some embodiments, the control of the power provided to the LC oscillator 222 by the battery 10 / 10a is performed by controlling the duty cycle and / or frequency of the PWM control signal provided to the main circuit switch K1. Or in some embodiments, the control of the power provided to the LC oscillator 222 by the battery 10 / 10a is performed by the frequency or duty cycle of the conduction and disconnection of the main circuit switch K1.

[0221] In some embodiments, the MCU controller 224 is further configured or programmed to determine the working power P of the susceptor 241 / 241a according to the AC impedance of the susceptor 241 / 241a.

[0222] The working power P of the susceptor 241 / 241a and the AC impedance of the susceptor 241 / 241a have a calculation formula 4:

[0223] 。

[0224] wherein in equation 4, Vin is the supply voltage provided to the LC oscillator 222, Rsp-0 is the AC impedance of the susceptor 241 / 241a at room temperature or cold state before the susceptor 241 / 241a is activated for heating, Rsp-T is the AC impedance of the susceptor 241 / 241a at an operating temperature T, and Rsd is the AC impedance of the rest of the circuitry excluding the susceptor 241 / 241a. The calculation of Rsp-T can be obtained by substituting the operating temperature T into the above fitting relationship, for example, Rsp = 113.86 + 0.1015 x T above.

[0225] In some embodiments, the vaporization boiling point temperature is given for a given composition of the aerosol-generating substrate; then in use, the heating temperature of the susceptor 241 / 241a can be maintained at the vaporization boiling point temperature T 沸点 corresponding to the desired power as the target power; in particular, the vaporization boiling point temperature T 沸点 of the aerosol-generating substrate can be substituted into the above fitting relationship "Rsp = 113.86 + 0.1015 x T" and equation 4 to calculate the target power P 目标 . Then in embodiments, the MCU controller 224 is further configured or programmed to adjust the on-time or duty cycle of the main circuit switch K1 according to the AC impedance of the susceptor 241 / 241a and / or the operating power P of the susceptor 241 / 241a, so as to maintain the operating power P of the susceptor 241 / 241a at the target power P 目标 .

[0226] In some embodiments, the aerosol-generating system employs a constant power mode to heat the aerosol-generating substrate; for example, in some embodiments, the operating power of the susceptor 241 / 241a is maintained at a constant value, for example, 15-25 W, in the constant power mode. Or more specifically, for example, the operating power of the susceptor 241 / 241a is maintained at 18 W or 20 W or 22 W in the constant power mode. Accordingly, the MCU controller 224 is further configured or programmed to adjust the on-time or duty cycle of the main circuit switch K1 according to the AC impedance of the susceptor 241 / 241a, so as to maintain the operating power of the susceptor 241 / 241a at the constant target power. In the embodiments shown in Figures 1 to 6, in each puff of the user, the MCU controller 224 adjusts the on-time or duty cycle of the main circuit switch K1 according to the AC impedance of each susceptor 241 / 241a in the constant power mode, so as to maintain the operating power of each susceptor 241 / 241a at the constant target power for heating, thereby substantially generating a consistent amount of aerosol or TPM in each puff of the user. Thus, the mouthfeel of each puff is substantially consistent.

[0227] In some embodiments, the MCU controller 224 is further configured or programmed to control the power provided by the battery 10 / 10a to the LC oscillator 222 according to the AC impedance of the susceptor 241 / 241a, so that the susceptor 241 / 241a heats the aerosol generating substrate according to a predetermined heating curve.

[0228] In some embodiments, the MCU controller 224 is further configured or programmed to control the power provided by the battery 10 / 10a to the LC oscillator 222 according to the AC impedance of the susceptor 241 / 241a, so that the temperature of the susceptor 241 / 241a is maintained at a predetermined temperature.

[0229] In some embodiments, the MCU controller 224 adjusts the on-time or duty cycle of the main circuit switch K1 according to a preset energy value provided to the susceptor 241 / 241a per unit time. For example, the preset energy value provided to the susceptor 241 / 241a per unit time is an energy value sufficient to generate a predetermined amount of aerosol or TPM during puffing, which can be, for example, 35 J / 3 s = 11.66667 J / s.

[0230] It should be noted that the preferred embodiments of the present application are given in the description of the application and its drawings, but the present application is not limited to the embodiments described in the specification, and further, those skilled in the art can make improvements or modifications according to the above description, and all these improvements and modifications shall fall within the protection scope of the claims of the present application.

Claims

1. An aerosol-generating system comprising, The receiver is configured to determine an AC impedance of the susceptor based on the resonant voltage of the LC oscillator. The controller is programmed to obtain a filtered signal by performing a denoising filtering process on a sampling signal based on the resonant voltage of the LC oscillator, and to obtain the resonant voltage of the LC oscillator based on the filtered signal. The sampling signal is obtained by sampling a shaped signal shaped from the resonant voltage of the LC oscillator. The shaping includes integral shaping.

2. An aerosol-generating system according to claim 1, wherein, The controller is programmed to:

3. An aerosol-generating system according to claim 2, wherein, determine a total AC impedance in the entire circuit based on the resonant voltage of the LC oscillator; and 4. An aerosol-generating system according to claim 3, wherein, determine the AC impedance of the susceptor by subtracting an AC impedance of the rest of the circuit other than the susceptor from the total AC impedance.

5. An aerosol-generating system according to any one of claims 1 to 4, wherein, The controller is further programmed to prevent or interrupt the LC oscillator from directing the AC current through the induction coil when it is determined that the temperature of the susceptor exceeds a predetermined threshold. The controller is further programmed to determine a puffing action of a user based on a decrease in the AC impedance of the susceptor. The controller is further programmed to:

6. An aerosol-generating system according to any one of claims 1 to 4, wherein, control the operating power of the susceptor based on the AC impedance of the susceptor so as to maintain the operating power of the susceptor at a predetermined power value.

7. An aerosol-generating system according to any one of claims 1 to 4, wherein, The receiver is configured to determine an AC impedance of the susceptor based on the resonant voltage of the LC oscillator.

8. An aerosol-generating system according to any one of claims 1 to 4, wherein, The controller is programmed to control the operating power of the susceptor based on the AC impedance of the susceptor so as to maintain the operating power of the susceptor at a predetermined power value.

12. A control method of an aerosol-generating system, the aerosol-generating system comprising:

9. An aerosol-generating system according to claim 8, wherein, a susceptor configured to heat an aerosol-generating substrate to generate an aerosol; an LC oscillator comprising an induction coil and a capacitor; and The receiver is configured to determine an AC impedance of the susceptor based on the resonant voltage of the LC oscillator. The controller is programmed to control the operating power of the susceptor based on the AC impedance of the susceptor so as to maintain the operating power of the susceptor at a predetermined power value.

10. An aerosol-generating system according to claim 8, wherein, ​ ​ 11. An aerosol-generating system comprising: ​ ​ ​ ​ ​ ​ ​ The LC oscillator is configured to direct an alternating current to flow through the induction coil, which in turn drives the induction coil to provide energy to the susceptor to heat the aerosol generating substrate; The method comprises: determining the AC impedance of the susceptor from the resonant voltage of the LC oscillator, and determining the temperature of the susceptor from the AC impedance of the susceptor.

13. A control method of an aerosol generating system, the aerosol generating system comprising: a susceptor to heat an aerosol generating substrate to generate an aerosol; an LC oscillator comprising an induction coil and a capacitor; The LC oscillator is configured to direct an alternating current to flow through the induction coil, which in turn drives the induction coil to provide energy to the susceptor to heat the aerosol generating substrate; The method comprises: determining the AC impedance of the susceptor from the resonant voltage of the LC oscillator, and controlling the operating power of the susceptor according to the AC impedance of the susceptor, so as to maintain the operating power of the susceptor at a predetermined power value.

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