Apparatus for aerosol generating devices

Abstract

To provide an aerosol generating device allowing determination of one or more characteristics.SOLUTION: A method and an apparatus are described including: controlling a resonant circuit 14 of an aerosol generating device, the resonant circuit including an inductive element for inductively heating a susceptor apparatus 16 to heat an aerosol generating material to thereby generate aerosol in a heating mode of operation; measuring a current flowing in the inductive element; and determining one or more characteristics of the aerosol generating device and / or the susceptor apparatus based on the measured current.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present specification relates to an apparatus for an aerosol generating device. [Background technology]

[0002] Smoking articles, such as cigarettes and cigars, burn tobacco to produce smoke during use. Attempts have been made to create alternatives to these articles that release compounds without combustion. For example, tobacco heating devices heat an aerosol-generating substrate, such as tobacco, to form an aerosol by heating the substrate without burning it. Summary of the Invention

[0003] In a first aspect, the present specification describes an apparatus for an aerosol-generating device, the apparatus including a resonant circuit (such as an LC resonant circuit) including an inductor element for inductively heating a susceptor arrangement to heat an aerosol-generating material and thereby generate an aerosol in a heating operation mode, a current sensor for measuring a current flowing in the inductor element, and a processor for determining one or more characteristics of one or more of the aerosol-generating device, the apparatus, and the susceptor arrangement based, at least in part, on the measured current.

[0004] The one or more characteristics identified by the processor may include the presence or absence of the susceptor device, one or more fault conditions, or whether the current matches the current of a predetermined susceptor device.

[0005] The susceptor device may be provided as a removable item. Further, the one or more characteristics determined by the processor may include a characteristic of the removable item. The characteristic determined by the processor may include the presence or absence of the removable item.

[0006] Identifying the one or more characteristics may include identifying whether the current is consistent with a susceptor device having a temperature above a first threshold temperature and / or below a second threshold temperature.

[0007] Some embodiments include a first switching unit (such as an H-bridge circuit) that can generate an alternating current from the DC voltage supply 11 and flow through an inductor element to cause inductive heating of the susceptor device in a heating operation mode.

[0008] Some embodiments further include an impulse generating circuit that applies an impulse to the resonant circuit, the applied impulse inducing an impulse response having a resonant frequency between a capacitor and an inductor element of the resonant circuit, and an output circuit that provides an output signal that depends on one or more characteristics of the impulse response. The output signal may be indicative of the resonant frequency of the impulse response. The output signal may be used to provide a temperature measurement of the inductor element.

[0009] In a second aspect, the present specification describes a non-combustion based aerosol generating device, including an apparatus including any of the features of the first aspect described above.

[0010] The aerosol-generating device may be configured to house a removable article containing an aerosol-generating material. The aerosol-generating material may further include an aerosol-generating substrate and an aerosol-forming material. The removable article may include the susceptor device.

[0011] In a third aspect, the present specification describes a method comprising controlling a resonant circuit (such as an LC resonant circuit) of an aerosol-generating device including an inductor element to inductively heat a susceptor apparatus to heat an aerosol-generating material and thereby generate an aerosol in a heating operation mode, measuring a current flowing through the inductor element (e.g., in the heating operation mode), and determining one or more characteristics of the aerosol-generating device and / or the susceptor apparatus based (at least in part) on the measured current.

[0012] The one or more characteristics identified by the processor may include one or more of the presence or absence of the susceptor device, a characteristic of the removable article, the presence or absence of the removable article, one or more fault conditions, whether the current matches the current of a predetermined susceptor device, whether the current matches the current of a susceptor having a temperature above a first threshold temperature and / or below a second threshold temperature, or whether the current matches the current of a genuine susceptor.

[0013] The method may further include applying an impulse to the resonant circuit, the applied impulse inducing an impulse response having a resonant frequency between a capacitor and an inductor element of the resonant circuit, and generating an output signal dependent on one or more characteristics of the impulse response.

[0014] In a fourth aspect, this specification describes computer readable instructions that, when executed on a computer, cause the computer to perform any method as described with reference to the third aspect.

[0015] In a fifth aspect, the present specification describes a kit of parts including an article for use in a non-combustion based aerosol generating system including an apparatus including any of the structures of the first aspect above or an aerosol generating device including any of the structures of the second aspect above, wherein the article may be, for example, a removable article including an aerosol-generating material.

[0016] In a sixth aspect, the present specification describes a computer program comprising instructions to cause at least an apparatus to control a resonant circuit of an aerosol-generating device including an inductor element that inductively heats a susceptor apparatus to heat an aerosol-generating material and thereby generate an aerosol in a heating operation mode; measure a current flowing through the inductor element; and determine one or more characteristics of the aerosol-generating device and / or the susceptor apparatus based (at least in part) on the measured current.

[0017] Exemplary embodiments will now be described, by way of example only, with reference to the following schematic drawings: [Brief explanation of the drawings]

[0018] [Figure 1] FIG. 1 is a block diagram of a system according to an exemplary embodiment. [Figure 2] FIG. 1 is a block diagram of a system according to an exemplary embodiment. [Figure 3] 1 illustrates a non-combustion based aerosol generating device according to an exemplary embodiment. [Figure 4] FIG. 1 is a diagram of a non-combustion based aerosol generating device according to an exemplary embodiment. [Figure 5] FIG. 1 is a diagram of an article for use with a non-combustion based aerosol generating device according to an exemplary embodiment. [Figure 6] FIG. 2 is a block diagram of a circuit according to an exemplary embodiment. [Figure 7] 1 is a flowchart illustrating an algorithm according to an exemplary embodiment. [Figure 8] 1 is a flowchart illustrating an algorithm according to an exemplary embodiment. [Figure 9] 1 is a flowchart illustrating an algorithm according to an exemplary embodiment. [Figure 10] 1 shows a plot illustrating an exemplary use of an exemplary embodiment. [Figure 11] 1 is a flowchart illustrating an algorithm according to an exemplary embodiment. [Figure 12] FIG. 2 is a block diagram of a circuit according to an exemplary embodiment. [Figure 13] 1 is a flowchart illustrating an algorithm according to an exemplary embodiment. [Figure 14] 1 is a plot illustrating an exemplary use of an exemplary embodiment. [Figure 15] 1 is a plot illustrating an exemplary use of an exemplary embodiment. [Figure 16] 1 is a flowchart illustrating an algorithm according to an exemplary embodiment. [Figure 17] 17 is a plot illustrating an exemplary use of the algorithm of FIG. 16. [Figure 18] FIG. 1 is a block diagram of a system according to an exemplary embodiment. [Figure 19] FIG. 1 is a block diagram of a system according to an exemplary embodiment. [Figure 20] 1 is a flowchart illustrating an algorithm according to an exemplary embodiment. [Figure 21] FIG. 2 is a block diagram of a circuit switching unit according to an exemplary embodiment. [Figure 22] FIG. 2 is a block diagram of a circuit switching unit according to an exemplary embodiment. [Figure 23] 1 is a flowchart illustrating an algorithm according to an exemplary embodiment. [Figure 24] 1 is a flowchart illustrating an algorithm according to an exemplary embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0019] As used herein, the term "delivery system" is intended to encompass a system that delivers a substance to a user; Combustible aerosol delivery systems, such as cigarettes, cigarillos, cigars and pipes or tobacco for roll-your-own or homemade cigarettes (whether based on tobacco, tobacco derivatives, expanded tobacco, reconstituted tobacco, tobacco substitutes or other smoking materials); non-combustion aerosol delivery systems that release compounds from aerosolizable materials without burning the aerosolizable material, such as e-cigarettes, tobacco heating products, and hybrid systems that generate aerosols using a combination of aerosolizable materials; an article including an aerosolizable material and configured for use in one of these non-combustible aerosol delivery systems; and Includes aerosol-free delivery systems such as lozenges, gums, patches, articles containing inhalable powders, and smokeless tobacco products such as snus and snuff that deliver nicotine-containing or non-nicotine-containing materials to the user without forming an aerosol.

[0020] For purposes of this disclosure, a "combustible" aerosol delivery system is one that combusts the constituent aerosolizable materials of the aerosol delivery system (or its components) to facilitate delivery to a user.

[0021] For purposes of this disclosure, a "non-combustion based" aerosol delivery system is one that may or may not combust the constituent aerosolizable materials of the aerosol delivery system (or its components) to facilitate delivery to the user.

[0022] In the embodiments described herein, the delivery system is a non-combustion based aerosol delivery system, for example, an electrically powered non-combustion based aerosol delivery system.

[0023] In one embodiment, the non-combustion based aerosol delivery system is an electronic cigarette, also known as a vape device or electronic nicotine delivery system (END), although the presence of nicotine in the aerosolizable material is not a requirement.

[0024] In one embodiment, the non-combustion based aerosol delivery system is a tobacco heating system, also known as a heated tobacco system.

[0025] In one embodiment, the non-combustion aerosol delivery system is a hybrid system that generates an aerosol using a combination of aerosolizable materials, one or more of which can be heated. Each of the aerosolizable materials can be, for example, in solid, liquid, or gel form, and may or may not contain nicotine. In one embodiment, the hybrid system includes a liquid or gel aerosolizable material and a solid aerosolizable material. The solid aerosolizable material can include, for example, tobacco or a non-tobacco product.

[0026] Typically, a non-combustion aerosol delivery system may include a non-combustion aerosol generating device and an article for use with the non-combustion aerosol delivery system, however, it is also contemplated that an article that itself includes a means for powering an aerosol-generating element may itself form a non-combustion aerosol delivery system.

[0027] In one embodiment, the non-combustion aerosol generating device may include a power source and a controller. The power source may be an electrical source or a heat generating power source. In one embodiment, the heat generating power source comprises a carbon substrate to which energy may be applied to deliver power in the form of heat to an adjacent aerosolizable material or heat transfer material. In one embodiment, a power source, such as a heat generating power source, is provided to an article to form the non-combustion aerosol supply.

[0028] In one embodiment, an article for use with a non-combustion based aerosol generating device may include an aerosolizable material, an aerosol-generating component, an aerosol-generating region, a mouthpiece, and / or a region for housing the aerosolizable material.

[0029] In one embodiment, the aerosol-generating element is a heater that can interact with the aerosolizable material to release one or more volatile substances from the aerosolizable material to form an aerosol. In one embodiment, the aerosol can be generated without heating the aerosolizable material. For example, the aerosol-generating element can generate the aerosol from the aerosolizable material without applying heat thereto, for example, by vibrational, mechanical, pressurized, or electrostatic means.

[0030] In one embodiment, the aerosolizable material may include an active material, an aerosol-forming material, and optionally one or more functional materials. The active material may include nicotine (optionally contained in tobacco or a tobacco derivative) and one or more other odorless physiologically active materials. An odorless physiologically active material is a material included in the aerosolizable material to achieve a physiological response other than olfaction.

[0031] The aerosol forming material may include one or more of glycerin, glycerol, propylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, 1,3-butylene glycol, erythritol, meso-erythritol, ethyl vanillate, ethyl laurate, diethyl base, triethyl citrate, triacetin, diacetin mixtures, benzyl benzoate, benzyl phenylacetate, tributyrin, lauryl acetate, lauric acid, myristic acid, and propylene carbonate.

[0032] The one or more functional ingredients may include one or more of a flavorant, a carrier, a pH regulator, a stabilizer, and / or an antioxidant.

[0033] In one embodiment, an article for use with a non-combustion aerosol-generating device may include an aerosolizable material or a region for containing an aerosolizable material. In one embodiment, an article for use with a non-combustion aerosol-delivery device may include a mouthpiece. The region for containing an aerosolizable material may be a storage region for storing the aerosolizable material. In one embodiment, the region for containing the aerosolizable material may be separate from or combined with the aerosol-generation region.

[0034] An aerosolizable material, also referred to herein as an aerosol-generating material, is a material that can generate an aerosol when activated, for example, by heating, irradiation, or in some other manner. The aerosolizable material may be in the form of a solid, liquid, or gel, with or without, for example, nicotine and / or flavorings. In some embodiments, the aerosolizable material may comprise an "amorphous solid," which is alternatively referred to as a "monolithic solid" (i.e., non-fibrous). In some embodiments, the amorphous solid may be a dry gel. An amorphous solid is a solid material that holds a fluid, such as a liquid, within it.

[0035] The aerosolizable material may be present on a substrate, which may be or include, for example, paper, cardboard, paperboard, recycled aerosolizable material, plastic material, ceramic material, composite material, glass, metal, or metal alloy.

[0036] 1 is a block diagram of a system, generally designated by the reference numeral 1, according to an exemplary embodiment. The system 1 includes a current sensor 5, a resonant circuit 6, a susceptor device 3, and a processor 4.

[0037] The resonant circuit 6 may include a capacitor and one or more inductor elements that inductively heat the susceptor device 3, thereby heating the aerosol-generating material. Heating the aerosol-generating material thereby generates an aerosol.

[0038] The current sensor 5 may measure the current flowing through one or more inductor elements of the resonant circuit 6. The resonant circuit 6 and the current sensor 5 may be combined within the induction heating device 2, which may be coupled to the processor 4. The processor 4 may receive information regarding the measured current from the current sensor.

[0039] 2 is a block diagram of a system, generally designated by the reference numeral 10, according to an exemplary embodiment. System 10 includes a power source in the form of a direct current (DC) voltage supply 11, a switching unit 13, a resonant circuit 14, a current sensor 15, a susceptor unit 16, and a processor 18. Switching unit 13, resonant circuit 14, and current sensor 15 may be combined within an induction heating device.

[0040] Resonant circuit 14 (similar to resonant circuit 6) may include a capacitor and one or more inductor elements that inductively heat susceptor device 16 to heat the aerosol-generating material.

[0041] The switching unit 13 can generate an AC current from the DC voltage supply 11. The AC current flows through one or more inductor elements of the resonant circuit 14, causing heating of the susceptor device 16. The switching unit 13 may include multiple transistors. Exemplary DC-AC converters include, for example, an H-bridge or an inverter circuit, examples of which will be described later. Note that providing a DC voltage supply 11 from which a pseudo-AC signal is generated is not an essential feature. For example, a controllable AC power supply or an AC-AC converter may be provided. Thus, an AC input (e.g., from a mains power supply or an inverter) can be provided.

[0042] An exemplary configuration of the switching element 13 and the resonant circuit 14 is discussed in more detail below with reference to FIG.

[0043] 3 and 4 show a non-combustion-based aerosol generating apparatus, generally designated by reference numeral 20, according to an exemplary embodiment. FIG. 3 is a perspective view of an aerosol generating device 20A with an outer cover. The aerosol generating device 20A includes a replaceable item 21, which is contained within (or provided elsewhere in) the item 21. It can be inserted into the aerosol generating device 20A to enable heating of the susceptor. The aerosol generating device 20A may further include an activation switch 22 used to turn the aerosol generating device 20A on and off. Other components of the aerosol generating device 20A are shown in FIG. 4.

[0044] 4 shows the aerosol generating device 20B with the outer cover removed. The aerosol generating device 20B includes an article 21, an activation switch 22, a plurality of inductor elements 23a, 23b, and 23c, and one or more air tube extensions 24 and 25. The one or more air tube extensions 24 and 25 are not required.

[0045] Each of the multiple inductor elements 23a, 23b, and 23c may form part of a resonant circuit, such as the resonant circuit 14. The inductor element 23a may include a spiral inductor coil. In one example, the spiral inductor coil is made of Litz wire / cable wound in a spiral shape to provide the spiral inductor coil. Many alternative inductor configurations are possible, such as an inductor formed within a printed circuit board. The inductor elements 23b and 23c may be similar to the inductor element 23a. The use of three inductor elements 23a, 23b, and 23c is not required for all exemplary embodiments. Thus, the aerosol generating device 20 may include one or more inductor elements.

[0046] A susceptor may be provided as part of the article 21. In an exemplary embodiment, inserting the article 21 into the aerosol generating device 20 may activate the aerosol generating device 20. This may be done by detecting the presence of the article 21 in the aerosol generating device using a suitable sensor (e.g., an optical sensor) or, if the susceptor forms part of the article 21, by detecting the presence of the susceptor using, for example, the resonant circuit 14. Upon activation of the aerosol generating device 20, the inductor element 23 may cause the susceptor to inductively heat the article 21. In another embodiment, the susceptor may be provided as part of the aerosol generating device 20 (e.g., as part of a holder for receiving the article 21).

[0047] 5 is a diagram of an article, generally designated by the reference numeral 30, for use with a non-combustion-based aerosol generating device, according to an exemplary embodiment. Item 30 is an example of replaceable item 21 described above with reference to FIGS. 3 and 4.

[0048] Article 30 includes a mouthpiece 31 and an aerosol-generating material 33, in this case a cylindrical rod of tobacco material, connected to mouthpiece 31. The aerosol-generating material 33 generates an aerosol when heated, for example, in a non-combustion aerosol-generating device, such as aerosol-generating device 20, as described herein. The aerosol-generating material 33 is enclosed in a wrapper 32. The wrapper 32 may be, for example, a paper or paper-lined metal foil wrapper. The wrapper 32 is substantially impermeable to air.

[0049] In one embodiment, wrapper 32 comprises aluminum foil. Aluminum foil has been found to be particularly effective in promoting the formation of an aerosol within aerosol-generating material 33. In one example, the aluminum foil has a metal layer having a thickness of approximately 6 μm. The aluminum foil may have a paper backing. However, in other arrangements, the aluminum foil may have other thicknesses, for example, between 4 μm and 16 μm. The aluminum foil also does not necessarily have a paper backing, but may or may not be backed with other materials, for example, to provide the foil with adequate tensile strength. Metal layers or foils other than aluminum may also be used. Furthermore, it is not necessary for such metal layers to be provided as part of article 21. For example, such metal layers may be provided as part of device 20.

[0050] The aerosol-generating material 33, also referred to herein as the aerosol-generating substrate 33, comprises at least one aerosol-forming material. In this example, the aerosol-forming material is glycerin. In another example, the aerosol-forming material may be another material or combination thereof, as described herein. The aerosol-forming material has been found to improve the sensory performance of the article by aiding in the transfer of compounds, such as flavor compounds, from the aerosol-generating material to the consumer.

[0051] 5, the mouthpiece 31 of the article 30 includes an upstream end 31a adjacent the aerosol-generating substrate 33 and a downstream end 31b distal from the aerosol-generating substrate 33. The aerosol-generating substrate includes tobacco, although substitutions are possible.

[0052] Mouthpiece 31 includes a body of material 36 upstream of, and in this example adjacent and abutting relationship to, hollow tubular member 34. Body of material 36 and hollow tubular member 34 each define a substantially cylindrical overall outer shape and share a common longitudinal axis. Body of material 36 is wrapped in a first plug wrapper 37. First plug wrapper 37 may have a basis weight of less than 50 gsm, such as between about 20 gsm and 40 gsm.

[0053] In this example, the hollow tubular member 34 is a first hollow tubular member 34, and the mouthpiece includes a second hollow tubular member 38, also referred to as a cooling member, upstream of the first hollow tubular member 34. In this example, the second hollow tubular member 38 abuts the upstream body of material 36. The body of material 36 and the second hollow tubular member 38 each define a substantially cylindrical overall outer shape and share a common longitudinal axis. The second hollow tubular member 38 is formed from multiple parallel-wound paper layers, butted together at seams to form the tubular member 38. In this example, the first and second paper layers are provided in a two-ply tube; however, in other examples, three, four, or more paper layers can be used to form a three-ply, four-ply, or more ply tube. Other constructions can be used, such as spirally wound layers of paper, cardboard tubes, tubes formed using a paper mache tube process, and molded or extruded plastic tubes. The second hollow tubular member 38 can also be formed using a stiff plug wrapper and / or tipping paper as the second plug wrapper 39 and / or tipping paper 35 described herein, meaning that a separate tubular member is not required.

[0054] The second hollow tubular member 38 is disposed around the mouthpiece 31, functioning as a cooling section, and defines a void within the mouthpiece 31. The void provides a chamber through which heated volatile components generated by the aerosol-generating material 33 can flow. The second hollow tubular member 38 is hollow to provide an aerosol accumulation chamber, yet is sufficiently rigid to withstand axial compressive forces and bending moments that may occur during manufacturing and use of the article 21. The second hollow tubular member 38 provides a physical displacement between the aerosol-generating material 33 and the body of material 36. The physical displacement provided by the second hollow tubular member 38 provides a temperature gradient across the length of the second hollow tubular member 38.

[0055] Of course, item 30 is provided by way of example only, and those skilled in the art will be aware of many alternative arrangements of such items that may be used in the systems described herein.

[0056] 6 is a block diagram of a circuit, generally designated by reference numeral 40, according to an exemplary embodiment. Circuit 40 includes a positive terminal 47 and a negative (ground) terminal 48 (which are an example implementation of DC voltage supply 11 of system 10 described above). Circuit 40 includes a switching unit 44 (implementing switching unit 13 described above), where switching unit 44 includes a bridge circuit (e.g., an H-bridge circuit, such as a FET H-bridge circuit). Switching unit 44 includes a first circuit branch 44a and a second circuit branch 44b, which are coupled by a resonant circuit 49 (implementing resonant circuit 14 described above). First circuit branch 44a includes switches 45a and 45b, and second circuit branch 44b includes switches 45c and 45d. Switches 45a, 45b, 45c, and 45d are transistors, such as field-effect transistors (FETs), and can receive input from a control device, such as control circuit 18 of system 10. Resonant circuit 49 includes capacitor 46 and inductor element 43, such that resonant circuit 49 is an LC resonant circuit. Circuit 40 further includes a current sensor 50 (implementing current sensor 15 described above) for measuring the current through inductor element 43. Circuit 40 also shows susceptor equivalent circuit 42 (thereby embodying susceptor portion 16). Susceptor equivalent circuit 42 includes resistors and inductor elements that represent the electrical effects of the exemplary susceptor portion 16. If a susceptor is present, susceptor portion 42 and susceptor element 43 can function as transformer 41. Transformer 41 can generate a varying magnetic field such that the susceptor heats when circuit 40 receives power. During a heating operation in which the susceptor unit 16 is heated by the induction device, the switching unit 44 is driven (e.g., by the control circuit 18) so that each of the first and second branches is alternately connected to pass an alternating current through the resonant circuit 14. The resonant circuit 14 has a resonant frequency based in part on the susceptor unit 16, and the control circuit 18 is configured to control the switching unit 44 to switch at or near the resonant frequency. Driving the switching circuit at or near resonance improves efficiency and reduces energy lost in the switching elements (which would otherwise unnecessarily heat the switching elements).In the example where an article 21 containing aluminum foil is heated, the switching element 44 is driven at a frequency of about 2.5 MHz. In other implementations, the frequency is, for example, anywhere between 500 kHz and 4 MHz.

[0057] A susceptor is a material that can be heated by penetration of a varying magnetic field, such as an alternating magnetic field. The heating material can be a conductive material, so that penetration by the varying magnetic field causes induction heating of the heating material. The heating material can be a magnetic material, so that penetration by the varying magnetic field causes magnetic hysteresis heating of the heating material. The heating material can be either conductive or magnetic, so that the heating material can be heated by both heating mechanisms.

[0058] Induction heating is the process of heating a conductive object by penetrating a changing magnetic field into the object. This process is explained by Faraday's law of electromagnetic induction and Ohm's law. An induction heater can include an electromagnet and a device for passing a changing current, such as an alternating current, through the electromagnet. When the object to be heated and the electromagnet are positioned relative to each other so that the changing magnetic field generated by the electromagnet penetrates the object, one or more eddy currents are generated within the object. The object has a resistance to the flow of current. Therefore, when such eddy currents are generated within the object, they flow against the object's electrical resistance, thereby heating the object. This process is called Joule heating, ohmic heating, or resistive heating. An object that can be inductively heated is known as a susceptor.

[0059] In one embodiment, the susceptor is in the form of a closed circuit. In some embodiments, it has been found that when the susceptor is in the form of a closed circuit, the magnetic coupling between the susceptor and the electromagnet during use is enhanced, resulting in greater or improved Joule heating.

[0060] Magnetic hysteresis heating is the process of heating an object made of a magnetic material due to the penetration of a changing magnetic field into the object. Magnetic materials can be thought of as containing many atomic-scale magnets, or magnetic dipoles. When a magnetic field penetrates such a material, the magnetic dipoles align along the field. Thus, when a changing magnetic field, such as that produced by an alternating magnetic field, penetrates a magnetic material, the orientation of the magnetic dipoles changes in response to the applied changing magnetic field. This reorientation of the magnetic dipoles generates heat within the magnetic material.

[0061] When an object is both conductive and magnetic, the penetration of a changing magnetic field into the object can cause both Joule heating and magnetic hysteresis heating in the object. Furthermore, the use of magnetic materials can enhance the changing magnetic field, thereby enhancing Joule heating.

[0062] In each of the above processes, heat is generated within the object itself, rather than by conduction from an external heat source, which allows for rapid temperature rise and more uniform heat distribution within the object. This can be achieved, among other things, by choosing the object's material and geometry and the magnitude and orientation of the varying magnetic field relative to the object. Furthermore, induction heating and magnetic hysteresis heating do not require a physical connection between the source of the varying magnetic field and the object, thereby increasing design freedom and control of the heating profile and reducing costs.

[0063] Figures 7-9 are flowcharts of algorithms generally designated by reference numerals 60, 70, and 80, according to exemplary embodiments. Figures 7-9 may be viewed in conjunction with previous figures (particularly Figure 2) for a better understanding of operation.

[0064] With reference to algorithm 60 of FIG. 7 , in operation 61, a resonant circuit of an aerosol-generating device is controlled, where the resonant circuit may include one or more inductor elements. The one or more inductor elements may be used to inductively heat a susceptor device to heat the aerosol-generating material. Heating the aerosol-generating material may thereby generate an aerosol in a heating operation mode of the aerosol-generating device. For example, resonant circuit 14 of system 10 may be controlled by processor 18. In operation 62, a current through the inductor element is measured with a current sensor. For example, the current through one or more inductor elements of resonant circuit 14 may be measured with current sensor 15. In operation 63, one or more characteristics of the aerosol-generating device and / or an apparatus for the aerosol-generating device may be determined based at least in part on the measured current.

[0065] With respect to algorithm 70 of FIG. 8, operations 61 and 62 similar to operations 61 and 62 of algorithm 60 of FIG. 7 are performed. In operation 71 of algorithm 70, the presence or absence of a susceptor device, such as susceptor device 16, is determined by a processor, such as processor 18, based on the measured current. If a susceptor device is not present (e.g., if a removable item is not present), the resonant circuit will read a very low resistance, resulting in a high current flow. Thus, the detection of a high current is indicative of the absence of a susceptor device. An exemplary implementation of such a device is further described with reference to FIG. 9.

[0066] With respect to algorithm 80 of Figure 9, operations 61 and 62 similar to operations 61 and 62 of algorithm 60 of Figure 7 are performed. Operation 81 of algorithm 80 determines whether the measured current is above or below a threshold level. Operation 82 determines the presence or absence of a susceptor device, such as susceptor device 16, by a processor, such as processor 18, based on whether the measured current is above or below the threshold level. For example, if the measured current is above the threshold level, a susceptor device is determined not to be present. If the measured current is below the threshold level, a susceptor device is determined to be present in the aerosol-generating device.

[0067] The one or more features of the aerosol-generating device and / or apparatus for the aerosol-generating device identified in operation 63 may take many forms. Further, as discussed above, the features may include the presence or absence of a susceptor or removable article. Alternatively or additionally, the features may include one or more of the options discussed below.

[0068] The one or more characteristics identified in operation 63 may include one or more fault conditions. The one or more fault conditions may relate to incorrect operation of the aerosol generating device. For example, the measured current level may indicate that one or more components of the aerosol generating device are not operating normally as expected or are not functioning at all. Other fault conditions include whether a removable item is properly inserted into the aerosol generating device (e.g., whether it is inserted in the correct manner and / or fully inserted), whether the removable item is in good condition, etc. Typically, the measured current is compared to an expected current value, which is the value obtained or determined in the absence of any fault conditions. The expected current value depends on other parameters or operating conditions of the device (e.g., whether the device is attempting to achieve one of several temperatures or powers supplied to the heating circuit). The measured current value may be compared to a single expected current value and determine whether the measured value is higher or lower than the expected current value; in other examples, the measured current value may be compared to a range of expected current values ​​and determine whether the measured current value is within the range of expected current values.

[0069] The one or more characteristics identified in operation 63 include whether the measured current matches the current of a predetermined susceptor device (e.g., an authentic inserted article). For example, the predefined susceptor device may include an authentic susceptor that is part of an authentic article manufactured by an authentic and conventional manufacturer. For example, an aerosol generating device may be compatible with the inserted article, and operation of the aerosol generating device may be optimized when a compatible authentic article is inserted. The current that flows through the inductor element of the aerosol generating device when the authentic article is used is known as a threshold current level. If the current matches the threshold current level in operation 63, the inserted susceptor is identified as similar to the predefined susceptor device, and the article corresponding to the inserted susceptor is identified as a compatible authentic article. If the current does not match the threshold current level, the inserted susceptor is identified as not similar to the predefined susceptor device, and the article corresponding to the inserted susceptor is identified as not being a compatible authentic article. As described above, the measured current value may be compared against a single expected current value and a determination of whether the measured value is higher or lower than the expected current value; in other instances, the measured current value may be compared against a range of expected current values ​​and a determination of whether the measured current value is within the range of expected current values.

[0070] The one or more characteristics identified in operation 63 may include whether the measured current is consistent with a susceptor device having a temperature above a first threshold temperature and / or below a second threshold temperature. For example, the aerosol-generating device may include a temperature sensing device for measuring the temperature of the susceptor, as discussed in more detail below, or may include impulse response-based temperature measurement. In one example, the susceptor temperature preferably exceeds a first threshold temperature and / or is below a second threshold temperature. If the susceptor is relatively hot, a temperature sensor in the aerosol-generating device detects the high temperature. However, if the susceptor is removed from the aerosol-generating device (when it is hot), the temperature sensor does not detect that the susceptor has been removed. This is due to a number of factors depending on the details of how the temperature is sensed. In some implementations, the temperature detected by the temperature sensor remains high until the aerosol-generating device cools down. In other implementations, a temperature sensor or a temperature sensor algorithm, such as impulse response-based temperature measurement, may not be able to distinguish between a hot susceptor and no susceptor. As discussed above, current measurements may be used to identify the presence or absence of a susceptor. Accordingly, current measurements may be used to confirm whether the temperature sensor is accurately indicating the susceptor temperature or whether the susceptor has been removed by determining whether the measured current corresponds to a susceptor device having a temperature above a first threshold temperature and / or below a second threshold temperature. This is beneficial as a safety mechanism, since the aerosol-generating device is preferably turned off or the heating mode of the aerosol-generating device is turned off when a susceptor is absent. That is, for example, the current sensor may be used to distinguish between a hot susceptor and a no-susceptor condition (which may give similar impulse responses in some situations, and which are difficult to distinguish using only a temperature detection algorithm, as discussed in more detail below).

[0071] FIG. 10 shows plots generally designated by reference numeral 100 illustrating an exemplary use of an exemplary embodiment. Plot 100 shows the current sensor output plotted against time (in microseconds). Plot 100 includes a first plot 101 with no susceptor, a second plot 102 with a susceptor, and a third plot 103 with a susceptor. A second plot where the susceptor is relatively hot and a third plot where the susceptor is relatively cool.

[0072] These plots clearly show that in this example, without a susceptor, the current sensor output is larger and the oscillations last longer. In this example, the current sensor output is similar when the susceptor is hot and cold. Therefore, the current sensor output can be used to provide information about the susceptor.

[0073] FIG. 11 is a flow chart generally designated 240 illustrating an algorithm according to an exemplary embodiment.

[0074] Algorithm 240 begins at operation 241, in which one or more impulses are applied to an induction heating circuit (such as resonant circuit 14 of system 10 described above). At operation 242, one or more impulse responses are determined (as discussed further below). At operation 243, the current through the inductor element is measured (e.g., using current sensor 15). At operation 244, one or more performance characteristics of the associated system are determined based on the measured current.

[0075] 12 is a block diagram of a system, generally designated by the reference numeral 300, according to an exemplary embodiment. The system 300 includes the resonant circuit 14 and susceptor 16 of the system 10 described above. The system 300 further includes an impulse generation circuit 302 and an impulse response processor 304. The impulse generation circuit 302 and the impulse response processor 304 may be implemented as part of the control circuit 18 of the system 10 and may perform operations 241 and 242 of the algorithm 240 described above.

[0076] The impulse generating circuit 302 switches between positive and negative voltage sources to generate impulses, and is therefore implemented using a first switching unit (such as an H-bridge circuit). For example, the switching unit 44 described above with reference to FIG. 6 may be used. As described further below, the impulse generating circuit 302 can generate impulses by changing the switching state of the FETs in the switching unit 44 from one state in which switches 45b and 45d are both on (so that the switching unit is grounded) and switches 45a and 45b are off, to the opposite state of one of the switches in the first and second circuit branches 44a and 44b. Alternatively, the impulse generating circuit 302 can be implemented using a pulse-width modulation (PWM) circuit. Other impulse generation arrangements are possible.

[0077] Based on the impulse response, the impulse response processor 304 can identify one or more performance metrics (or characteristics) of the resonant circuit 14 and the susceptor 16. Such performance metrics may include characteristics of the item (such as the removable item 21), the presence or absence of such item, the type of item, the operating temperature, etc.

[0078] 13 is a flow chart illustrating an algorithm, generally designated by the reference numeral 310, according to an exemplary embodiment. The algorithm 310 illustrates an example use of the system 300.

[0079] The algorithm 310 begins with operation 312, where an impulse (generated by the impulse generating circuit 302) is applied to the resonant circuit 14. Figure 14 is a plot, generally designated by the reference numeral 320, illustrating an exemplary impulse applied in operation 312.

[0080] The impulse may be applied to the resonant circuit 14. Alternatively, in a system having multiple inductor elements (such as the non-combustion based aerosol device 20 described above with reference to FIGS. 3 and 4), the impulse generating circuit 302 may select one of multiple resonant circuits, each including an inductor element and a capacitor for inductively heating a susceptor, where the applied impulse induces an impulse response between the capacitor and the inductor element of the selected resonant circuit.

[0081] In operation 314, an output is generated (by impulse response processor 304) based on the impulse response generated in response to the impulse applied in operation 312. FIG. 15, a plot generally designated by reference numeral 325, illustrates an exemplary impulse response received by impulse response processor 304 in response to impulse 320. As shown in FIG. 15, the impulse response may take the form of a ringing resonance. The impulse response is the result of charge bouncing between the inductor and capacitor of resonant circuit 14. In one configuration, this results in no heating of the susceptor; that is, the temperature of the susceptor remains substantially constant (e.g., within ±1°C or ±0.1°C of the temperature before applying the impulse).

[0082] At least some of the characteristics of the impulse response (e.g., the frequency and decay rate of the impulse response) provide information about the system to which the impulse is applied. Thus, as described further below, system 300 can be used to identify one or more characteristics of the system to which the impulse is applied. For example, one or more performance characteristics, such as a fault condition, characteristics of the inserted item 21, the presence or absence of such item 21, whether the item 21 is authentic, or an operating temperature, can be identified based on the output signal derived from the impulse response. System 300 can use the identified one or more characteristics of system 10 to perform further operations (or prevent further operations, as appropriate) using system 10, for example, to heat susceptor unit 16. For example, based on the identified operating temperature, system 300 can select the power level, or whether power should be applied, to the induction device to cause further heating of the susceptor unit. For some performance characteristics, such as identifying a fault condition or whether an item 21 is authentic, the measured characteristic of the system (measured using an impulse response) can be compared to an expected value or range of values ​​for the characteristic, and action taken by the system 300 can be based on the comparison.

[0083] 16 is a flow chart illustrating an algorithm, according to an exemplary embodiment, generally designated by reference numeral 330. In operation 332 of algorithm 330, an impulse is applied to resonant circuit 14 by impulse generating circuit 302. Thus, operation 332 is the same as operation 312 described above.

[0084] In operation 334 of the algorithm 330, the period of the impulse response induced in response to the applied impulse is determined by the impulse response processor 304. Finally, in operation 336, an output (based on the determined period of the impulse response) is generated.

[0085] 17 is a plot generally designated by the reference numeral 340 illustrating an example use of algorithm 330. Plot 340 shows an impulse 342 applied to resonant circuit 14 by impulse generating circuit 302. Applying impulse 342 executes operation 332 of algorithm 330. An impulse response 344 is derived in response to the applied impulse. Impulse 342 is held in its final state (high in plot 340) during measurement, although this is not required. For example, a high-low impulse could be applied (and held low).

[0086] The impulse response processor 304 generates a signal 346 that indicates the edge of the impulse response 334. As explained further below, the signal 346 is generated by a comparator, and there may be a delay between the occurrence of the edge and the generation of the signal. If consistent, that delay may not be significant to the processing.

[0087] The period of the impulse response is determined in operation 334 of algorithm 330. An exemplary period is indicated by arrow 348 in FIG.

[0088] At operation 336 of the algorithm 330, an output is generated based on the identified period 348. The output signal is therefore based on the time interval from the first end of the impulse and the second end one complete cycle of the impulse response. The output signal is therefore dependent on the time interval of the voltage oscillations of the impulse response, and as a result, the output signal is indicative of the resonant frequency of the impulse response.

[0089] In some embodiments, the period 348 is temperature dependent, and therefore the output produced in operation 336 may be a temperature estimate.

[0090] 18 is a block diagram of a system, generally designated by reference numeral 350, according to an exemplary embodiment. System 350 is used to perform operation 336 of algorithm 330 described above.

[0091] The system 350 includes an edge detection circuit 352 , a current source 353 , and a sample and hold circuit 354 .

[0092] The edge detection circuit 352 can be used to identify the edges of a signal, such as the above-mentioned impulse response signal 344. Thus, the edge detection circuit 352 can generate the above-mentioned signal 346. The edge detection circuit 352 can be implemented, for example, using a comparator or some similar type of circuit.

[0093] Edge detect circuit 352 provides an enable signal to current source 353. When enabled, current source 353 can be used to generate an output (such as a voltage output across a capacitor). The current source has a discharge input that functions as a reset input. The current source output can be used to indicate the duration since the output of edge detect circuit 352 enabled the current source. Thus, the current source output can be used as an indication of the duration (e.g., pulse duration).

[0094] A sample and hold circuit 354 can be used to generate an output signal based on the output of current source 353 at a particular time. The sample and hold circuit can have a reference input. The sample and hold circuit can be used as an analog-to-digital converter (ADC) to convert the capacitor voltage to a digital output. In other systems, other suitable electronic components, such as a voltmeter, can be used to measure the voltage.

[0095] The system 350 is implemented using a charge time measurement unit (CTMU), for example, an integrated CTMU.

[0096] 19 is a block diagram of a system according to an exemplary embodiment, generally designated by the reference numeral 360. System 360 illustrates features of a CTMU that may be used in an exemplary embodiment.

[0097] System 360 includes reference voltage generator 151, comparator 152, edge detect module 153, current source controller 154, constant current source 155, analog-to-digital converter 156 providing data output 157 to a data bus, and external capacitor 158. As described further below, voltage generator 151, comparator 152, and edge detect module 153 can be used to implement edge detect circuit 352 described above, current source controller 154 and constant current source 155 can be used to implement current source 353, and analog-to-digital converter 156 can be used to implement sample-and-hold circuit 354 described above.

[0098] The impulse response generated in operations 314 and 334 above is sent to the input of a comparator 152, which compares the impulse response to the output of a reference voltage generator 151. The comparator may output a logic high signal if the impulse response is greater than the reference voltage, or a logic low signal if the impulse response is less than the reference voltage (or vice versa). The output of the comparator 152 is provided to an input (IN2) of an edge detection circuit 153. The other input (IN1) of the detection circuit 153 is a firmware controlled input. The edge detection circuit 153 (which may simply be a selectable RS flip-flop) generates an enable signal that depends on the identification of an edge at the output of the comparator 152. The edge detection circuit 153 is programmable to indicate the nature of the edge to be detected (e.g., rising or falling edge, first edge, etc.).

[0099] The enable signal is provided as an input to current source control 154. When enabled, current source control 154 applies a current (from constant current source 155) that is used to charge external capacitor 158. A discharge input to the current source control can be used to discharge external capacitor 158 (and effectively reset the charge stored on the capacitor to a base value).

[0100] An analog-to-digital converter 156 is used to determine the voltage across an external capacitor 158, which is used to provide a data output 157. In this manner, the system 150 provides a voltage ramp that is initiated at an identified end and terminated when a second end is identified.

[0101] There are many other use cases for the systems described herein. By way of example, FIG. 20 is a flow chart illustrating an algorithm generally designated by reference numeral 370 according to an exemplary embodiment. Algorithm 370 begins with operation 371, in which an impulse is generated and applied to resonant circuit 14. In operation 372, a decay rate of an impulse response induced in response to the applied impulse is determined. The decay rate can be used, for example, to determine information about the circuit to which the impulse is applied. For example, the decay rate in the form of a Q-factor measurement can be used to estimate an operating temperature. Operation 372 is an example of operation 214 of FIG. 13. That is, the decay rate is an example of an output based on the impulse response.

[0102] 21 is a block diagram of a circuit switching section, generally designated by the reference numeral 380, according to an exemplary embodiment. Switching section 380 illustrates the switch positions of circuit 40 in a first state, generally designated by the reference numeral 382, ​​and a second state, generally designated by the reference numeral 383.

[0103] In a first state 382, ​​switches 45a and 45c of circuit 40 are off (i.e., open), and in a second state 383, switches 45b and 45d are on (i.e., closed). Thus, in first state 382, ​​both sides of resonant circuit 49 are connected to ground. In second state 383, a voltage pulse is applied to the resonant circuit.

[0104] 22 is a block diagram of a circuit switching section, according to an exemplary embodiment, generally designated by the reference numeral 390. Switching section 390 illustrates the switch positions of circuit 40 in a first state, generally designated by the reference numeral 392, and a second state, generally designated by the reference numeral 393.

[0105] In a first state 392, switch 45b is connected (i.e., closed) and switches 45a, 45c, and 45d are disconnected (i.e., open), thus connecting one side of resonant circuit 49 to ground. In a second state 393, a voltage pulse (i.e., impulse) is applied to the resonant circuit.

[0106] In the second state 382 of the switching unit 380, the current flows through the first switch 45a, the resonant circuit 49 , and switch 45d. This current flow can cause heat generation and discharge of the power source (such as a battery). Conversely, in the second state 393 of the switching unit 390, no current flows through switch 45d, reducing heat generation and power source discharge. Furthermore, noise generation can be reduced when each impulse is generated.

[0107] 23 is a flow chart illustrating an algorithm according to an exemplary embodiment, generally designated by the reference numeral 400. Algorithm 400 illustrates an example use of the system described herein.

[0108] The algorithm 400 begins with a measurement operation 401. The measurement operation 401 may include, for example, a temperature measurement. Next, in operation 402, a heating operation is performed. The performance of the heating operation 402 may depend on the output of the measurement operation 401. Once the heating operation 402 is complete, the algorithm 400 returns to operation 401, where the measurement operation is repeated.

[0109] Operation 401 is performed in system 3000 in which an impulse is applied by impulse generating circuit 62 and a measurement (e.g., a temperature measurement) is determined based on the output of impulse response processor 64. As noted above, the temperature measurement may be based on, for example, a decay rate, an impulse response time, an impulse response period, etc.

[0110] Operation 402 may be performed by controlling circuitry 40 to heat susceptor 16 of system 10. Induction heating device 12 may be driven at or near the resonant frequency of the resonant circuit to cause efficient heating. The resonant frequency may be identified based on the output of operation 401.

[0111] In one implementation of algorithm 400, a measurement operation is performed for a first time period, a heating operation 402 is performed for a second time period, and then the process is repeated. For example, the first time period is 10 milliseconds and the second time period is 250 milliseconds, although other time intervals are possible. In other words, a measurement operation is performed between successive heating operations. However, a heating operation 402 performed for a second time period does not necessarily mean that power is supplied to the induction coil for the entire second time period. For example, power may be supplied for only a portion of the second time period.

[0112] In an alternative embodiment, algorithm 400 is implemented with heating operations 402 whose duration depends on the level of heating required (if more heating is required, the heating duration increases; if less heating is required, the heating duration decreases). In such an algorithm, measurement operation 401 is simply performed when no heating is being performed, so that heating operation 402 does not need to be interrupted to perform measurement operation 401. This alternating heating section is sometimes referred to as a pulse width modulation approach to heating control. For example, a pulse width modulation scheme is provided at a frequency on the order of 100 Hz, with each period divided into a heating portion and a measurement portion (of variable length).

[0113] 24 is a flow chart illustrating an algorithm according to an exemplary embodiment, generally designated by the reference numeral 410. The algorithm 410 can be implemented using the system 300 described above.

[0114] Algorithm 410 begins at operation 411, where switch circuit 13 (e.g., circuit 40) applies an impulse to resonant circuit 14. At operation 413, the impulse response (e.g., as detected by impulse response processor 64) is used to determine whether an item (e.g., item 21) is present in the system being heated. As discussed above, the presence of item 21 affects the impulse response in a detectable manner.

[0115] If an item is detected at operation 413, the algorithm 410 moves to operation 415. Otherwise, the algorithm ends at operation 419.

[0116] A measuring and heating operation is performed in operation 415. For example, operation 415 can be performed using the above algorithm 400. Of course, alternative measuring and heating arrangements can be provided.

[0117] Once a number of heating measurements and heating cycles have been performed, the algorithm 400 moves to operation 417, where it is determined whether the heating should be stopped (e.g., if the heating period has expired or in response to user input). If so, the algorithm ends at operation 419; if not, the algorithm 400 returns to operation 411.

[0118] Of course, the above techniques for determining one or more characteristics of an inductive or susceptor portion can be applied to individual inductor elements. For systems including multiple inductor elements, such as system 20 including three inductor elements 23a, 23b, and 23c, the system can be configured to determine one or more parameters, such as temperature, for each of the inductor elements using the above techniques. In some implementations, it may be beneficial for the system to operate using individual measurements for each inductor element. In other implementations, it may be beneficial for the system to operate using only a single measurement of multiple inductors (e.g., to determine whether article 21 is present). In such situations, the system is configured to determine an average measurement corresponding to the measurements obtained from each inductor element. In other examples, one or more characteristics can be determined using only one of the multiple inductor elements.

[0119] The various embodiments described herein are provided merely to aid in understanding and teaching the claimed features. These embodiments are merely representative examples and are not intended to be comprehensive or exclusive. It should be understood that the advantages, embodiments, examples, functions, features, structures, and / or other aspects of the present disclosure should not be construed as limiting the disclosure to the exact scope of the claims or to the equivalents of the claims, and that other embodiments may be utilized or modified without departing from the scope and / or spirit of the present disclosure. Various embodiments may suitably comprise, consist of, or consist essentially of the disclosed elements, components, features, parts, steps, means, or other combinations. The present disclosure also encompasses other inventions not currently claimed but which may be claimed in the future.

Claims

1. 1. An apparatus for an aerosol generating device, the apparatus comprising: a resonant circuit including an inductor element for inductively heating the susceptor device to heat the aerosol-generating material, thereby generating an aerosol in a heating mode of operation; a current sensor for measuring a current flowing through the inductor element; a processor for identifying one or more characteristics of at least one of the aerosol-generating device, the apparatus, and the susceptor apparatus based on the measured current; The apparatus, wherein the one or more characteristics determined by the processor includes determining whether the measured current matches a predefined susceptor device current.

2. The apparatus of claim 1, wherein the susceptor device is provided as part of a removable article.

3. The apparatus of claim 2 , wherein the one or more characteristics identified by the processor include a characteristic of the removable item.

4. 4. The apparatus of claim 3, wherein the characteristics of the removable item determined by the processor include the presence or absence of the removable item.

5. 5. The apparatus of claim 1, wherein the one or more characteristics identified by the processor include one or more fault conditions.

6. 6. The apparatus of claim 1, wherein identifying the one or more characteristics includes determining whether the measured current is consistent with a susceptor device having a temperature above a first threshold temperature and / or below a second threshold temperature.

7. 7. The apparatus according to claim 1, further comprising a first switching unit capable of generating an alternating current from a DC voltage supply and causing it to flow through the inductor element to cause induction heating of the susceptor device in a heating operation mode.

8. 8. The device of claim 7, wherein the first switching unit includes an H-bridge circuit.

9. 9. The device according to claim 1, wherein the resonant circuit is an LC resonant circuit.

10. an impulse generating circuit that applies an impulse to the resonant circuit, the applied impulse inducing an impulse response having a resonant frequency between a capacitor and an inductor element of the resonant circuit; 10. Apparatus according to any one of claims 1 to 9, further comprising an output circuit for providing an output signal dependent on one or more characteristics of the impulse response.

11. 11. The apparatus of claim 10, wherein the output signal is indicative of a resonant frequency of an impulse response.

12. 12. Apparatus according to claim 10 or 11, wherein the output signal is used to provide a temperature measurement of the inductor element.

13. A non-combustion aerosol generating device comprising the apparatus of any one of claims 1 to 12.

14. 14. The non-combustion aerosol generating device of claim 13, wherein the aerosol generating device is configured to accommodate a removable article containing an aerosol-generating material.

15. 15. The non-combustion aerosol-generating device according to claim 14, wherein the aerosol-generating material includes an aerosol-generating base material and an aerosol-forming material.

16. 16. The non-combustion aerosol generating device according to claim 14 or 15, wherein the removable article includes the susceptor device.

17. A processor-implemented method comprising: controlling a resonant circuit of an aerosol-generating device including an inductor element to inductively heat the susceptor unit to heat the aerosol-generating material and thereby generate an aerosol in a heating mode of operation; measuring a current flowing through the inductor element; and identifying one or more characteristics of the aerosol-generating device and / or the susceptor apparatus based on the measured current; The method, wherein the one or more characteristics determined by the processor includes determining whether the measured current matches a predefined susceptor unit current.

18. The one or more identified characteristics are: The characteristics of removable articles, the presence or absence of said removable article; one or more fault conditions; whether the measured current corresponds to a susceptor device having a temperature above a first threshold temperature and / or below a second threshold temperature; or 20. The method of claim 17, further comprising one or more of: whether the measured current matches the current of a genuine susceptor device.

19. applying an impulse to a resonant circuit, the applied impulse inducing an impulse response having a resonant frequency between a capacitor and an inductor element of the resonant circuit; 19. The method of claim 17 or 18, further comprising generating an output signal that depends on one or more characteristics of the impulse response.

20. A kit of parts including articles for use in a non-combustion based aerosol generating system, the non-combustion based aerosol generating system including an apparatus as claimed in any one of claims 1 to 12 or an aerosol generating device as claimed in any one of claims 13 to 16.

21. 21. The kit of claim 20, wherein the article is a removable article containing an aerosol-generating material.

22. A computer program comprising instructions, when executed by a processor, for causing an apparatus to: controlling a resonant circuit of an aerosol-generating device including an inductor element to inductively heat the susceptor unit to heat the aerosol-generating material, thereby generating an aerosol in a heating mode of operation; measuring a current flowing through the inductor element; and identifying one or more characteristics of the aerosol-generating device and / or the susceptor apparatus based on the measured current; The one or more characteristics determined by the processor include determining whether the measured current matches a predefined susceptor unit current.

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