Aerosol generating device

Abstract

An aerosol generating device is provided, in which a accommodating space for accommodating an aerosol generating substrate is formed, and a heat-sensitive body included in the aerosol generating substrate is heated by an induction heating method. The aerosol generating device includes: a battery, the battery is used to provide DC power; a power converter, the power converter is configured to convert the DC power into AC power; a coil, the coil is wound along the accommodating space and extends along the length direction of the aerosol generating device, and the coil is configured to heat the heat-sensitive body by applying an alternating magnetic field whose direction periodically changes according to the AC power converted by the power converter to the heat-sensitive body included in the aerosol generating substrate; and a controller, the controller is configured to: in a smoking interval, when the duty cycle of the power converter is fixed at a preset second duty cycle, control the current supplied to the coil so that the temperature of the heat-sensitive body reaches a preset target temperature.

Description

[0001] This application is a divisional application of the invention patent application with the application date of September 6, 2021, application number 2021800100525 (PCT / KR2021 / 012058), and invention name “Aerosol Generating Device”. Technical Field

[0002] The present disclosure relates to an aerosol generating device, and more particularly, to an induction heating aerosol generating device. Background Art

[0003] Recently, there has been an increasing demand for alternative methods to overcome the disadvantages of conventional cigarettes. For example, there is an increasing demand for aerosol-generating devices that generate aerosol by heating a cigarette or an aerosol-generating substance in a liquid reservoir rather than by combustion.

[0004] Methods other than providing a heater, such as a resistor, inside or outside a cigarette contained in an aerosol generating device and heating the cigarette by supplying power to the heater are being proposed. In particular, research into methods of heating cigarettes by induction heating is actively underway.

[0005] Induction heating aerosol-generating devices convert direct current (DC) power into alternating current (AC) power to generate an alternating magnetic field and transmit the AC power to an induction coil. However, because existing aerosol-generating devices control switching elements in the same manner during operation, their energy efficiency is significantly reduced. Summary of the Invention

[0006] Problems to be solved by the invention

[0007] The technical problem to be solved by the present disclosure is to provide an aerosol generating device that can greatly reduce energy loss by changing the working mode of a power converter that provides alternating current to an induction coil.

[0008] The technical problems of the present invention are not limited to the above description, and other technical problems can be deduced from the embodiments to be described below.

[0009] Means used to solve problems

[0010] According to one embodiment, an aerosol generating device includes: a battery, a heating unit configured to heat an aerosol generating substrate, a power converter including a plurality of switching elements and configured to convert power supplied by the battery and transmit the converted power to the heating unit, and a controller configured to control the plurality of switching elements based on a temperature profile including a preheating interval and a smoking interval, thereby changing an operating mode of the power converter.

[0011] In some embodiments, an aerosol generating device is provided, in which a accommodating space for accommodating an aerosol generating substrate is formed, and a heat-sensitive body included in the aerosol generating substrate is heated by an induction heating method, and the aerosol generating device includes: a battery, the battery is used to provide DC power; a power converter, the power converter is configured to convert DC power into AC power; a coil, the coil is wound along the accommodating space and extends along the length direction of the aerosol generating device, and the coil is configured to heat the heat-sensitive body by applying an alternating magnetic field whose direction periodically changes according to the AC power converted by the power converter to the heat-sensitive body included in the aerosol generating substrate; and a controller, the controller is configured to: in a smoking interval, when the duty cycle of the power converter is fixed at a preset second duty cycle, control the current supplied to the coil so that the temperature of the heat-sensitive body reaches a preset target temperature.

[0012] Effects of the Invention

[0013] The aerosol generating device of the present disclosure operates in a first mode with high output power during a preheating interval where rapid preheating is required, and operates in a second mode with lower output power but higher energy efficiency than the first mode during a smoking interval where sustained heating to a temperature is more important than rapid heating, thereby maximizing energy efficiency.

[0014] Furthermore, the aerosol generating device can synchronize the temperature profile interval change with the operating mode change and set the target temperature before the interval change to be higher than the target temperature after the interval change, thereby compensating for the temperature drop caused by the operating mode change. In other words, the aerosol generating device can minimize the additional power required to reach the target temperature by changing the operating mode when the target temperature decreases.

[0015] In addition, since the aerosol generating device controls the switching element based on the most efficient duty cycle of the power converter in the second mode, energy efficiency can be greatly improved.

[0016] If the heating unit is heated using a proportional-integral-derivative (PID) control method from the initial preheating point, the battery may be overloaded due to the ripple component of the current. However, the aerosol generating device of the present disclosure sets a current upper limit in the early preheating period, thereby preventing battery damage.

[0017] The effects of the present invention are not limited to the above effects, and those skilled in the art can clearly understand the effects not mentioned based on this specification and the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 and Figure 2 This is a diagram showing an induction heating aerosol generating device.

[0019] Figure 3 and Figure 4 An example of a cigarette is shown.

[0020] Figure 5 and Figure 6 An example of a cigarette inserted into an aerosol generating device is shown.

[0021] Figure 7 is a block diagram of an aerosol generating device according to an embodiment.

[0022] Figure 8 It shows Figure 7 Figure 4 shows the working method of the drive controller.

[0023] Figure 9 FIG. 1 is an internal circuit diagram of a power converter and a heating unit according to an embodiment of the present invention.

[0024] Figure 10 FIG. 1 is a diagram illustrating a method of changing an operating mode according to a temperature curve according to an embodiment.

[0025] Figure 11 1 is a diagram illustrating an operation method of a switching element in a first mode.

[0026] Figure 12 and Figure 13 is a diagram showing current flow according to the operation of the switching element in the first mode.

[0027] Figure 14 1 is a diagram illustrating an operation method of the switching element in the second mode.

[0028] Figure 15 and Figure 16 is a diagram showing current flow according to the operation of the switching element in the second mode.

[0029] Figure 17 FIG. 4 is a flow chart of an operating method of an aerosol generating device according to an embodiment. DETAILED DESCRIPTION

[0030] According to one aspect of the present disclosure, an aerosol generating device includes: a battery, a heating unit configured to heat an aerosol generating substrate, a power converter including a plurality of switching elements and configured to convert power supplied by the battery and transmit the converted power to the heating unit, and a controller configured to control the plurality of switching elements based on a temperature curve including a preheating interval and a smoking interval, thereby changing an operating mode of the power converter.

[0031] The controller may be configured to change the operating mode of the power converter when the preheating interval is changed to the smoking interval.

[0032] The controller may be configured to preheat the heating unit based on a first target temperature in the preheating interval, heat the heating unit based on a second target temperature different from the first target temperature in the smoking interval, and change the operating mode of the power converter when the first target temperature changes to the second target temperature.

[0033] The controller may be configured to set the first target temperature to be greater than the second target temperature.

[0034] The controller may be configured to control the plurality of switching elements so that the power converter operates in a first mode in the preheating interval, and control the plurality of switching elements so that the power converter operates in a second mode different from the first mode in the smoking interval.

[0035] The controller may be configured to control the plurality of switching elements such that the power converter operates as a full-bridge circuit in the first mode, and to control the plurality of switching elements such that the power converter operates as a half-bridge circuit in the second mode.

[0036] The preheating interval may include a first subinterval and a second subinterval following the first subinterval, and the controller may be configured to control the power converter in the first subinterval such that the current supplied to the heating unit does not exceed a preset upper limit.

[0037] The controller may be configured to control the power converter based on a first duty cycle during the second subinterval.

[0038] The controller may be configured to control the power converter based on a second duty cycle different from the first duty cycle in the puff interval following the second sub-interval.

[0039] The first duty cycle may be lower than the second duty cycle.

[0040] The power converter may include: a first link aggregation group including a first switching element and a second switching element, and a second link aggregation group including a third switching element and a fourth switching element, and connected in parallel with the first link aggregation group; the heating unit may be connected to a node between the first switching element and the second switching element and may be connected to a node between the third switching element and the fourth switching element.

[0041] The controller may be configured to operate the first switching element and the second switching element in a complementary manner, and to operate the third switching element and the fourth switching element in a complementary manner during the preheating interval.

[0042] The controller may be configured to operate the first switching element and the second switching element in a complementary manner during the smoking interval, while turning off the third switching element and turning on the fourth switching element.

[0043] The power converter may be configured to convert direct current from the battery into alternating current, and the heating unit may include a coil configured to generate an alternating magnetic field based on the alternating current.

[0044] The heating unit may further include a heat-sensitive body configured to generate heat by the alternating magnetic field.

[0045] Regarding the terms used to describe the various embodiments, currently widely used general terms are selected taking into account the functions of the structural elements in the various embodiments of the present invention. However, the meaning of the terms can be changed according to intention, precedent, the emergence of new technologies, etc. In addition, in some cases, uncommon terms can be selected. In this case, the meaning of the terms will be described in detail at the corresponding parts in the description of the present invention. Therefore, the terms used in the various embodiments of the present invention should be defined based on the meaning of the terms and the description provided herein.

[0046] In addition, unless otherwise explicitly stated, the term "comprising" will be understood to imply the inclusion of the described elements but not the exclusion of any other elements. In addition, the terms "section" and "module" described in this specification may refer to units for processing at least one function and / or work, and may be implemented by hardware components or software components and a combination thereof.

[0047] As used herein, expressions such as “at least one of,” when following a list of elements, modify the entire list of elements and do not modify the individual elements in the list. For example, the expression “at least one of a, b, and c” should be understood to include only “a,” only “b,” only “c,” “a and b,” “a and c,” “b and c,” or “a, b, c” all.

[0048] The term "cigarette" may refer to any article that is loaded into an aerosol-generating device and thus functions as a user's mouthpiece. A cigarette may have a shape and structure similar to a traditional combustible cigarette. Such a cigarette may contain an aerosol-generating substance that generates an aerosol through the operation (e.g., heating) of the aerosol-generating device. Alternatively, a cigarette may not contain an aerosol-generating substance and deliver an aerosol generated from another article (e.g., a cigarette cartridge) mounted on the aerosol-generating device to the user's mouth.

[0049] Embodiments of the present invention will be described more fully below with reference to the accompanying drawings, in which exemplary embodiments of the present invention are shown to enable those skilled in the art to readily implement the present invention. However, the present invention may be implemented in many different forms and should not be construed as limited to the embodiments described herein.

[0050] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0051] Figure 1 and Figure 2 This is a diagram showing an induction heating aerosol generating device.

[0052] Reference Figure 1 The aerosol generating device 100 may include a heat-sensitive body 110, a coil 130, a battery 140, and a controller 150. According to one embodiment, the heat-sensitive body 110 may be included in a cigarette (eg, Figure 3 and Figure 4 In this case, if Figure 2 As shown, the aerosol generating device 100 may not include the heat-sensitive body 110 .

[0053] Figure 1 and Figure 2 The aerosol generating device 100 includes the components related to this embodiment. Therefore, those skilled in the art will understand that the aerosol generating device 100 may also include Figure 1 and Figure 2 Additional common components beyond the components.

[0054] The aerosol generating device 100 may generate aerosol by heating the cigarette 200 accommodated in the accommodation space 120 according to an induction heating method. The induction heating method may refer to a method of heating a magnetic substance by an alternating magnetic field whose direction periodically changes.

[0055] When an alternating magnetic field is applied to a magnetic material, eddy currents and hysteresis losses may cause energy loss in the magnetic material. This lost energy can be released from the magnetic material as heat. As the amplitude or frequency of the alternating magnetic field applied to the magnetic material increases, more heat can be released from the magnetic material. This heat can be transferred to the cigarette 200.

[0056] The magnetic substance heated by the external magnetic field may be the heat-sensitive body 110. The heat-sensitive body 110 may be in the shape of a block, a sheet, or a strip.

[0057] The heat-sensitive body 110 may include metal or carbon. The heat-sensitive body 110 may include at least one of ferrite, ferromagnetic alloy, stainless steel, and aluminum (Al). Alternatively, the heat-sensitive body 110 may include at least one of a ceramic such as graphite, molybdenum, silicon carbide, niobium, a nickel alloy, a metal film, or zirconium oxide, a transition element such as nickel (Ni) or cobalt (Co), and a non-metal such as boron (B) or phosphorus (P).

[0058] The aerosol generating device 100 may include an accommodation space 120 for accommodating the cigarette 200. The accommodation space 120 may include an opening for receiving the cigarette 200. The cigarette 200 may be inserted into the aerosol generating device 100 through the opening of the accommodation space 120.

[0059] like Figure 1 As shown, the heat-sensitive body 110 may be disposed in the accommodation space 120. The heat-sensitive body 110 may be attached to the bottom of the accommodation space 120. The cigarette 200 may be pushed toward the bottom of the accommodation space 120 so that the heat-sensitive body 110 is inserted into the cigarette 200.

[0060] Or, as Figure 2 As shown, the aerosol generating device 100 may not include the heat-sensitive body 110. In this case, the heat-sensitive body 110 may be included in the cigarette 200.

[0061] The aerosol generating device 100 may include a coil 130 that applies an alternating magnetic field to the heat-sensitive body 110 and changes a resonance frequency according to a temperature change of the heat-sensitive body 110 caused by induction heating of the heat-sensitive body 110 .

[0062] The coil 130 may be a solenoid. The coil 130 may be a solenoid wound around the accommodation space 120, and the cigarette 200 may be accommodated in the interior space of the solenoid. The wire material forming the solenoid may include copper (Cu). However, the material is not limited thereto. The material may have a low specific resistance value, thereby allowing high current flow. Examples of such materials include silver (Ag), gold (Au), aluminum (Al), tungsten (W), zinc (Zn), nickel (Ni), or alloys containing at least one of the above materials.

[0063] The coil 130 may be wound around the receiving space 120 and located at a position corresponding to the thermal conductor 110 .

[0064] The battery 140 can supply power to the coil 130. The battery 140 can be a lithium iron phosphate (LiFePO4) battery, but is not limited thereto. For example, the battery can be a lithium cobalt oxide (LiCoO2) battery, a lithium titanate battery, or the like.

[0065] The controller 150 may control the power supplied to the coil 130. The controller 150 may change the driving frequency of the coil 130. The controller 150 may control the induction heating of the heat-sensitive body 110 by controlling the driving frequency.

[0066] Figure 3 and Figure 4 An example of a cigarette is shown.

[0067] Reference Figure 3 and Figure 4 Cigarette 200 may include a tobacco rod 210 and a filter rod 220. Filter rod 220 may include one or more segments. For example, filter rod 220 may include a first segment configured to cool the aerosol and a second segment configured to filter specific components contained in the aerosol. Filter rod 220 may also include at least one segment configured to perform other functions.

[0068] The cigarette 200 may be wrapped by at least one wrapping paper 240. The wrapping paper 240 may have at least one hole capable of introducing external air or exhausting internal air. For example, the cigarette 200 may be wrapped by a single wrapping paper. As another example, Figure 3 and Figure 4 As shown, cigarette 200 can be double-wrapped by at least two wrappers 240. For example, tobacco rod 210 can be wrapped by a first wrapper, and filter rod 220 can be wrapped by a second wrapper. Alternatively, tobacco rod 210 and filter rod 220, each wrapped by a separate wrapper, can be combined, and the entire cigarette 200 can be wrapped by a third wrapper.

[0069] The tobacco rod 210 may include an aerosol-generating substance. For example, the aerosol-generating substance may include at least one of glycerin, propylene glycol, ethylene glycol, dipropylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, and oleyl alcohol, but is not limited thereto. Furthermore, the tobacco rod 210 may contain other additives such as flavoring agents, humectants, and / or organic acids. Furthermore, a flavoring liquid such as menthol or a moisturizer may be added to the tobacco rod 210 by spraying the tobacco rod 210.

[0070] The tobacco rod 210 can be made in a variety of ways. For example, the tobacco rod 210 can be made from tobacco sheets, or from tobacco shreds. Furthermore, the tobacco rod 210 can be made from tobacco leaves obtained by shredding tobacco sheets.

[0071] According to one embodiment, the cigarette 200 may further include a heat-sensitive body 110. In this case, Figure 4 As shown, the heat-sensitive body 110 can be provided in the tobacco rod 210. The heat-sensitive body 110 can extend from the end of the tobacco rod 210 in a direction toward the filter rod 220.

[0072] The tobacco rod 210 may be wrapped with a heat-conductive material. For example, the heat-conductive material may be a metal foil such as aluminum foil, but is not limited thereto. As an example, the heat-conductive material surrounding the tobacco rod 210 can evenly distribute heat transferred to the tobacco rod 210, thereby increasing the thermal conductivity applied to the tobacco rod and improving the flavor of the aerosol generated from the tobacco rod 210.

[0073] The filter rod 220 may include a cellulose acetate filter. Furthermore, the shape of the filter rod 220 may vary. For example, the filter rod 220 may be cylindrical, or may be a tubular rod with a hollow interior. Furthermore, the filter rod 220 may be a concave rod with a cavity. If the filter rod 220 is composed of multiple segments, the multiple segments may also be manufactured into different shapes.

[0074] The filter rod 220 may be formed to generate a flavor. For example, a flavoring liquid may be injected into the filter rod 220, or additional fibers coated with a flavoring liquid may be inserted into the filter rod 220.

[0075] Filter rod 220 may also include at least one capsule 230. Capsule 230 can generate both fragrance and aerosol. For example, capsule 230 may be a structure consisting of a liquid containing fragrance encapsulated in a membrane. Capsule 230 may be spherical or cylindrical, but is not limited thereto.

[0076] When the filter rod 220 includes a section configured to cool the aerosol, the cooling section may comprise a polymer material or a biodegradable high molecular material. For example, the cooling section may comprise only pure polylactic acid. In some embodiments, the cooling section may comprise a cellulose acetate filter having multiple holes. However, the cooling section is not limited thereto and may comprise a structure for cooling the aerosol and an aerosol cooling material.

[0077] Figure 5 and Figure 6 An example of a cigarette inserted into an aerosol generating device is shown.

[0078] In more detail, Figure 5 An example in which the heat-sensitive body 110 is provided on the aerosol generating device 100 is shown, and Figure 6 An example is shown in which the heat-sensitive body 110 is provided on the cigarette 200 .

[0079] Reference Figure 5 The cigarette 200 can be accommodated in the accommodation space 120 in the longitudinal direction of the cigarette 200. The heat-sensitive body 110 can be inserted into the cigarette 200 accommodated in the aerosol generating device 100, so that the tobacco rod 210 can come into contact with the heat-sensitive body 110. The heat-sensitive body 110 can extend in the longitudinal direction of the aerosol generating device 100, so that the heat-sensitive body 110 can be inserted into the cigarette 200.

[0080] The heat-sensitive body 110 may be located at the center of the accommodation space 120 to be inserted into the central portion of the cigarette 200 . Figure 5 A single heat-sensitive body 110 is shown, but the number of heat-sensitive bodies 110 is not limited thereto. In other words, the aerosol generating device 100 may include a plurality of heat-sensitive bodies extending in the length direction of the aerosol generating device 100 to be inserted into the cigarette 200.

[0081] The coil 130 may be wound around the accommodation space 120 along the length direction of the accommodation space 120. The coil 130 may extend in the length direction of the accommodation space 120 to a length corresponding to the heat-sensitive body 110 and may be located at a position corresponding to the heat-sensitive body 110.

[0082] Reference Figure 6 The cigarette 200 may be accommodated in the accommodation space 120 in the length direction of the cigarette 200 . As the cigarette 200 is accommodated in the accommodation space 120 , the heat-sensitive body 110 may be surrounded by the coil 130 .

[0083] The heat-sensitive body 110 may be located in the center of the tobacco rod 210 for uniform heat transfer. Figure 6 A single heat-sensitive body 110 is shown, but the number of heat-sensitive bodies 110 is not limited thereto. In other words, a plurality of heat-sensitive bodies may be included in the cigarette 200.

[0084] The coil 130 may be wound around the accommodation space 120 along the length direction of the accommodation space 120. The coil 130 may extend to a length corresponding to the heat-sensitive body 110 in the length direction and may be located at a position corresponding to the heat-sensitive body 110.

[0085] Figure 7 is a block diagram of an aerosol generating device according to an embodiment.

[0086] Reference Figure 7 The aerosol generating device 100 may include an input unit 710 , an output unit 720 , a detector 730 , an interface unit 740 , a power converter 751 , a heating unit 752 , a battery 760 , a memory 770 , and a controller 780 . Figure 7 The battery 760 and the controller 780 may correspond to Figure 1 and Figure 2 The battery 140 and the controller 150 are provided. Figure 7 The heating unit 752 may correspond to Figure 1 and Figure 2 According to one embodiment, Figure 7 The heating unit 752 may include Figure 1 The heat-sensitive body 110.

[0087] The input unit 710 can receive user input. For example, the input unit 710 can be a push button, but is not limited thereto. When the input unit 710 receives user input, a control signal corresponding to the user input can be transmitted to the controller 780. The controller 780 can control the internal components of the aerosol generating device 100 in response to the control signal. For example, the controller 780 can supply power to the heating unit 752 in response to the control signal.

[0088] The output unit 720 may output visual information and / or tactile information related to the aerosol generating device 100. To this end, the output unit 720 may include a display (not shown), a vibration motor (not shown), and the like.

[0089] The detector 730 may detect information related to the operation of the aerosol generating device 100. In one embodiment, the detector 730 may include a temperature detector 731 for detecting the temperature of the heating unit 752. The temperature detector 731 may include at least one temperature sensor, and the temperature sensor may be disposed adjacent to the heating unit 752. According to one embodiment, the detector 730 may further include a puff sensor for detecting a user's puff.

[0090] The interface unit 740 can serve as a passage to various types of external devices connected to the aerosol generating device 100. For example, the interface unit 740 may include a port that can be connected to the external device, and the aerosol generating device 100 can be connected to the external device through the port. When connected to the external device, the aerosol generating device 100 can exchange data with the external device. The interface unit 740 can serve as a passage for external power supply. For example, the interface unit 740 may include a port that can be connected to the external device, and when the aerosol generating device 100 is connected to an external power source, the aerosol generating device 100 can receive external power from the external power source.

[0091] The heating unit 752 can heat the aerosol generating substrate. As the aerosol generating substrate is heated, an aerosol can be generated. The aerosol generating substrate can be Figure 3 and Figure 4 200 of cigarettes.

[0092] The heating unit 752 may include a coil 130. In addition, the heating unit 752 may further include a capacitor ( Figure 9 According to one embodiment, the heating unit 752 may further include a heat-sensitive body 110.

[0093] When current is applied to the coil 130, the heat-sensitive body 110 may be heated by the alternating magnetic field generated in the coil 130. The heated heat-sensitive body 110 may heat the aerosol-generating substrate, thereby generating aerosol.

[0094] According to an embodiment, the heating unit 752 may not include the heat-sensitive body 110, and the heat-sensitive body 110 may be included in the aerosol generating substrate. In this case, the heating unit 752 may be referred to as a magnetic field generator.

[0095] The battery 760 may supply power to the heating unit 752 under the control of the controller 780. In this case, the power converter 751 may convert the power supplied from the battery 760 and transmit the converted power to the heating unit 752.

[0096] The power converter 751 may convert direct current supplied from the battery 760 into alternating current, and may transmit the alternating current to the heating unit 752. The power converter 751 may include a switching element for converting direct current into alternating current.

[0097] The memory 770 may store information for operating the aerosol generating device 100. In one embodiment, the memory 770 may store information related to a temperature profile.

[0098] The temperature profile may include information regarding target temperatures corresponding to the heating intervals. The heating intervals may include a preheating interval, during which the temperature of heat-sensitive element 110 is raised to a predetermined preheating temperature, and a smoking interval, during which the temperature of heat-sensitive element 110 is maintained within a certain range. The target temperature in the preheating interval may be set higher than the target temperature in the smoking interval. For example, the target temperature in the preheating interval may be set to approximately 340°C, and the target temperature in the smoking interval may be set to approximately 335°C.

[0099] The controller 780 may control the temperature of the heating unit 752 based on the difference between the temperature of the heating unit 752 and the target temperature. In other words, the controller 780 may perform feedback control based on the temperature information of the heating unit 752.

[0100] In detail, the controller 780 may control the power supplied to the heating unit 752 according to a feedback control method using a difference between the temperature of the heating unit 752 and the target temperature, an integral value of the difference over time, and a differential value of the difference over time.

[0101] In one embodiment, the controller 780 may control the temperature of the heating unit 752 according to a proportional-integral-derivative (PID) control method. The PID control coefficient may be preset through experiments to optimally control the temperature of the heating unit 752. The controller 780 may control the temperature of the heating unit 752 according to the PID control coefficient so that the temperature of the heating unit 752 reaches a target temperature.

[0102] The controller 780 can control the power supplied to the heating unit 752 by controlling the power converter 751. The controller 780 can control the power converter 751 using a pulse width modulation (PWM) method. The controller 780 can control the switching elements in the power converter 751 using a PWM method. To this end, the controller 780 may include a drive controller 781 that controls the switching elements. According to one embodiment, the drive controller 781 may be formed as a separate component different from the controller 780.

[0103] Typically, power converter 751 can achieve maximum efficiency at a specific duty cycle. For example, power converter 751 can operate at maximum power efficiency at a duty cycle of approximately 50%. Duty cycle refers to the percentage of time a switching element is on during a switching cycle. Therefore, in this specification, duty cycle is equivalent to duty ratio.

[0104] According to related art, when power converter 751 includes a full-bridge circuit, the switching element operates only in full-bridge mode. Alternatively, according to related art, when power converter 751 includes a half-bridge circuit, the switching element operates only in half-bridge mode. However, if power converter 751 includes a full-bridge circuit and is controlled to achieve maximum power efficiency at a fixed duty cycle throughout the heating interval, it is difficult to reduce the temperature of heating unit 752 during the smoking interval. On the other hand, if power converter 751 includes a half-bridge circuit and is controlled to achieve maximum power efficiency at a fixed duty cycle throughout the heating interval, rapid preheating during the preheating interval is difficult due to the low output power of the half-bridge circuit.

[0105] To solve the above problem, according to an embodiment, the power converter 751 including the full-bridge circuit may change an operation mode according to a temperature curve to improve the power efficiency of the power converter 751 .

[0106] In more detail, the controller 780 may control the switching element based on the temperature curves associated with the preheating interval and the smoking interval, thereby changing the operating mode of the power converter 751 .

[0107] The controller 780 can change the operating mode of the power converter 751 to enable the aerosol generating device 100 to operate at maximum efficiency. The operating mode may include a first mode and a second mode. In one embodiment, the first mode may be a mode in which the power converter 751 operates as a full-bridge circuit. Alternatively, the second mode may be a mode in which the power converter 751 operates as a half-bridge circuit. The power converter 751 may output a first power in the first mode and a second power in the second mode, wherein the second power is less than the first power.

[0108] Controller 780 can change the mode of power converter 751 based on the temperature profile. During the preheating interval, controller 780 can control the switching elements included in power converter 751 to operate in the first mode. Furthermore, during the smoking interval following the preheating interval, controller 780 can control the switching elements included in power converter 751 to operate in a second mode different from the first mode.

[0109] The preheating interval and the smoking interval can have different target temperatures and / or heating times. The controller 780 can control the power converter 751 to ensure that the temperature of the heat-sensitive body 110 reaches the target temperature. During the first heating period, the controller 780 can control the power converter 751 based on the first target temperature. Additionally, during the second heating period, the controller 780 can control the power converter 751 based on the second target temperature. The first heating period can correspond to the preheating interval, and the second heating period can correspond to the smoking interval. The first heating period can be shorter than the second heating period.

[0110] During a portion of the preheating interval, controller 780 may control power converter 751 based on a first duty cycle. Furthermore, during the smoking interval, controller 780 may control power converter 751 based on a second duty cycle that is different from the first duty cycle. The second duty cycle may be set so that power converter 751 operates at maximum power efficiency. For example, the second duty cycle may be approximately 50%. The first duty cycle may be smaller than the second duty cycle. For example, the first duty cycle may be approximately 40%. Although power efficiency is maximized at the second duty cycle, the first duty cycle is set smaller than the second duty cycle to facilitate lowering the temperature of heating unit 752 during the smoking interval.

[0111] Because power converter 751 includes switching elements, there are software issues such as signal delays and hardware issues such as delays in switching the switching elements on and off. This makes it difficult to accurately control the temperature of heat-sensitive body 110 during operating mode changes. For example, the temperature of heat-sensitive body 110 may drop during operating mode changes. Even if the temperature drops, additional power is required to increase the temperature of heat-sensitive body 110 to the target temperature in order to maintain a consistent target temperature. This additional power is undesirable and results in energy loss.

[0112] According to one embodiment, to solve this problem, the first target temperature can be set higher than the second target temperature, and the operating mode can be changed when the target temperature drops. In other words, the aerosol generating device 100 can minimize energy loss by synchronizing temperature profile switching and operating mode switching.

[0113] More specifically, controller 780 can change the operating mode of power converter 751 when the first target temperature changes to the second target temperature. Since the second target temperature is lower than the first target temperature, the additional power required by power converter 751 can be significantly reduced. Thus, the energy loss of power converter 751 can be minimized.

[0114] Figure 8 yes Figure 7 Figure 4 shows the working method of the drive controller.

[0115] Reference Figure 8 The driving controller 781 may provide switching signals sw1 and sw2 to the power converter 751. The switching signals may include on / off information of the switching element, duty cycle information, etc. The power converter 751 may operate in the first mode or the second mode in response to the switching signals sw1 and sw2.

[0116] The driving controller 781 may output a first switching signal sw1 to enable the power converter 751 to operate in the first mode during the preheating period. The power converter 751 may operate as a full-bridge circuit in response to the first switching signal sw1.

[0117] The driving controller 781 may output a second switching signal sw2 to enable the power converter 751 to operate in the second mode during the smoking interval. The power converter 751 may operate as a half-bridge circuit in response to the second switching signal sw2.

[0118] Figure 9 FIG. 1 is an internal circuit diagram of a power converter and a heating unit according to an embodiment of the present invention.

[0119] Reference Figure 9 The power converter 751 may include: a first link aggregation group 910 including a first switching element S1 and a second switching element S2; and a second link aggregation group 920 including a third switching element S3 and a fourth switching element S4 and connected in parallel with the first link aggregation group 910.

[0120] The first to fourth switching elements S1 to S4 may be bidirectional switching elements. For example, the first to fourth switching elements S1 to S4 may be field effect transistors (FETs), but are not limited thereto.

[0121] The first switching element S1 and the second switching element S2 may be connected in series. Furthermore, the third switching element S3 and the fourth switching element S4 may be connected in series. A first link aggregation group 910 including the first switching element S1 and the second switching element S2 may be connected in parallel with a second link aggregation group 920 including the third switching element S3 and the fourth switching element S4. The first link aggregation group 910 and the second link aggregation group 920 may be connected in parallel to the battery 760.

[0122] The heating unit 752 may be connected between a first node n1 and a second node n2 , wherein the first node n1 is located between the first switching element S1 and the second switching element S2 , and the second node n2 is located between the third switching element S3 and the fourth switching element S4 .

[0123] In more detail, the heating unit 752 may include a coil 130 and a capacitor C connected in series with the coil 130. The capacitor C may be a device for resonating with the heat-sensitive body 110. According to one embodiment, the capacitor C may be connected in parallel with the coil 130.

[0124] The first node n1 may be located between the first switching element S1 and the second switching element S2, and the second node n2 may be located between the third switching element S3 and the fourth switching element S4. In addition, the coil 130 and the capacitor C may be connected between the first node n1 and the second node n2.

[0125] The controller 780 may control power supplied to the coil 130 by controlling operations of the first to fourth switching elements S1 to S4 .

[0126] Figure 9 Only the specific components related to this embodiment are shown. Therefore, those skilled in the art will understand that Figure 9 Other common components other than those in the aerosol generating device 100 may also be included in the aerosol generating device 100. For example, the power converter 751 may further include a diode device connected in parallel with the first to fourth switching elements S1 to S4, respectively, to prevent reverse current.

[0127] Figure 10 FIG. 1 is a diagram illustrating a method of changing an operating mode according to a temperature curve according to an embodiment.

[0128] Reference Figure 10 , the figure shows the target temperature 1010 of the heat-sensitive body 110, the temperature 1020 of the heat-sensitive body 110, the current 1030 supplied to the coil 130, the matching frequency 1040 between the coil 130 and the heat-sensitive body 110, and the duty cycle 1050 of the power converter 751. Figure 10 , the x-axis represents time, and the y-axis represents any one of current (A), frequency (Hz), temperature (° C.), and duty cycle (%).

[0129] The controller 780 can heat the heat-sensitive body 110 according to a temperature curve. The temperature curve may include a target temperature 1010 and information related to the heating time. The temperature curve may be divided into a preheating interval and a smoking interval based on the target temperature 1010 and / or the heating time. The preheating interval refers to the interval in which the temperature 1020 of the heat-sensitive body 110 increases to a preset preheating temperature. For example, the preheating temperature may be approximately 340°C, but is not limited thereto. The smoking interval refers to the interval in which the user actually takes a puff and the temperature 1020 of the heat-sensitive body 110 is maintained within a preset smoking temperature range. For example, the smoking temperature range may be between approximately 330°C and approximately 340°C, but is not limited thereto.

[0130] Based on the temperature curve, the controller 780 can preheat the heat-sensitive body 110 based on the first target temperature Te1 until time t1. Time t1 may correspond to the end of the preheating interval. During the preheating interval, the controller 780 can control the power converter 751 to make the temperature 1020 of the heat-sensitive body 110 reach the first target temperature Te1.

[0131] After time t1, controller 780 may heat heat-sensitive body 110 at a second target temperature Te2, which is lower than first target temperature Te1, until time t2. The interval between time t1 and time t2 may correspond to a smoking interval. During the smoking interval, controller 780 may maintain temperature 1020 of heat-sensitive body 110 at second target temperature Te2 by controlling power converter 751.

[0132] During the preheating period, the controller 780 may control the switching elements to enable the power converter 751 to operate in the first mode, which may be a mode in which the power converter 751 operates as a full-bridge circuit.

[0133] The preheating interval can be divided into a first subinterval and a second subinterval following the first subinterval. The first and second subintervals can be determined based on the temperature 1020 of the heat-sensitive body 110. The controller 780 can heat the heat-sensitive body 110 based on the first target temperature Te1 until time t3, which is before time t1. For example, time t3 can be set so that the temperature 1020 of the heat-sensitive body 110 within the first subinterval is within the range of (Te1-200)°C to (Te1-30)°C.

[0134] In the first subinterval, controller 780 may control power converter 751 in the first submode. The first submode may be a mode in which an upper limit of current 1030 supplied to coil 130 is set to remove a ripple component. In addition, the first submode may be a mode in which temperature feedback control is not performed.

[0135] In the first subinterval, the controller 780 may set an upper limit of the supply current 1030. In addition, in the first subinterval, the controller 780 may fix the matching frequency 1040. In the first subinterval, the controller 780 may heat the thermal conductor 110 by controlling the duty cycle 1050 of the power converter 751 based on the first target temperature Te1.

[0136] In detail, the controller 780 can limit the magnitude of the supply current 1030 in the first subinterval to be less than or equal to a preset reference current. For example, the reference current can be set to a value in the range of about 1A to about 4A. The reason for setting the lower limit to 1A is that the minimum current required by the heating coil 130 is 1A. In addition, the reason for setting the upper limit of the reference current to 4A is that the rated current of the battery 760 is 6A, and the total current required by the components other than the heating unit 752 is 2A. For example, the reference current can be set to about 1.95A.

[0137] In addition, the controller 780 may fix the matching frequency 1040 in the first subinterval. The matching frequency 1040 may be set based on the resonant frequency of the coil 130 and the capacitor C. In one embodiment, the matching frequency 1040 may be set to be higher than a preset resonant frequency value, but is not limited thereto.

[0138] During the first subinterval, the controller 780 may not perform temperature feedback control. Alternatively, during the first subinterval, the control unit 780 may increase the temperature 1020 of the heat-sensitive body 110 by increasing the duty cycle 1050 of the power converter 751, while maintaining the magnitude of the supply current 1030 below the upper limit and the matching frequency 1040 constant. For example, the controller 780 may increase the duty cycle 1050 of the power converter 751 to approximately 45%.

[0139] In the second sub-interval, the controller 780 may control the power converter 751 based on the second sub-mode. The second sub-mode may be a mode in which current is not restricted to allow for rapid preheating. Alternatively, the second sub-mode may be a mode in which temperature feedback control is performed to bring the temperature 1020 of the heat-sensitive body 110 to the first target temperature Te1. In the second sub-mode, the output power of the power converter 751 may be greater than in the second mode described below. The reason for not controlling the power converter 751 in the second sub-mode from the start of preheating is to prevent damage to the battery 760 due to the ripple component of the current.

[0140] The controller 780 may maintain the duty cycle 1050 of the power converter 751 during the second subinterval. In one embodiment, during the second subinterval, the controller 780 may maintain the duty cycle 1050 of the power converter 751 at a first duty cycle. The first duty cycle may be set to 5% lower than the maximum duty cycle value during the first subinterval. For example, the first duty cycle may be set to approximately 40%. During the second subinterval, the controller 780 may heat the heat-sensitive body 110 by controlling the current 1030 supplied to the coil 130 and / or matching the frequency 1040 based on the first target temperature Te1.

[0141] Specifically, during the second subinterval, the controller 780 may maintain the duty cycle 1050 of the power converter 751 at the first duty cycle. Furthermore, during the second subinterval, the controller 780 may perform feedback control based on the difference between the temperature 1020 of the heat-sensitive body 110 and the first target temperature Te1. The controller 780 may control the temperature 1020 of the heat-sensitive body 110 using a PID control method. The controller 780 may control the current 1030 supplied to the coil 130 and / or the matching frequency 1040 according to a PID control coefficient to ensure that the temperature 1020 of the heat-sensitive body 110 reaches the first target temperature Te1.

[0142] During the smoking interval, controller 780 can control the switching element to operate power converter 751 in a second mode, different from the first mode. The second mode may be a mode in which power converter 751 operates as a half-bridge circuit. Alternatively, the second mode may be a mode in which the temperature 1020 of heat-sensitive element 110 is maintained at maximum power efficiency. In the second mode, power converter 751 may have a lower output power than in the first mode and may operate at maximum power efficiency.

[0143] During the smoking interval, the controller 780 may maintain the duty cycle 1050 of the power converter 751. In one embodiment, during the smoking interval, the controller 780 may maintain the duty cycle 1050 of the power converter 751 at a second duty cycle. The second duty cycle may be greater than the first duty cycle. The second duty cycle may be set to achieve maximum power efficiency for the power converter 751. For example, the second duty cycle may be set to approximately 50%. During the smoking interval, the controller 780 may heat the heat-sensitive body 110 by controlling the current 1030 supplied to the coil 130 and / or matching the frequency 1040 according to the second target temperature Te2.

[0144] According to an embodiment, during the smoking interval, while the duty cycle 1050 of the power converter 751 is maintained at the second duty cycle, the controller 780 may perform feedback control based on the difference between the temperature 1020 of the thermal conductor 110 and the second target temperature Te2 .

[0145] As described above, the aerosol generating device 100 according to one embodiment can improve its power efficiency by changing the operating mode of the power converter 751 according to the temperature curve.

[0146] The aerosol generating device 100 can maximize energy efficiency by setting the first target temperature Te1 to be greater than the second target temperature Te2 and synchronizing the interval change of the temperature profile with the operation mode change.

[0147] In detail, since the power converter 751 includes a switching element, there are software issues such as signal delay and hardware issues such as on / off delay of the switching element, so the temperature of the thermal body 110 may drop when the operation mode is changed.

[0148] To this end, the controller 780 may set the first target temperature Te1 to be higher than the second target temperature Te2, and may change the operating mode of the power converter 751 when the first target temperature Te1 changes to the second target temperature Te2. Since the second target temperature Te2 is lower than the first target temperature Te1, the additional power required to maintain the temperature 1020 of the heat-sensitive body 110 at the target temperature 1010 can be greatly reduced. This minimizes energy loss in the power converter 751.

[0149] Figure 11 1 is a diagram illustrating an operation method of a switching element in a first mode. Figure 12 and Figure 13 is a diagram showing current according to the operation of the switching element in the first mode.

[0150] Reference Figures 11 to 13 In the first mode, the controller 780 can control the switching elements S1 to S4 to enable the power converter 751 to operate as a full-bridge circuit. In the first mode, the controller 780 can enable the switching elements S1 to S4 in each link aggregation group to operate complementarily.

[0151] The controller 780 can turn on the first switching element S1 and the fourth switching element S4 and turn off the second switching element S2 and the third switching element S3 in the half period Ts / 2 of the switching period Ts. Figure 12 ) flows through the battery 760, the first switching element S1, the coil 130, the capacitor C and the fourth switching element S4.

[0152] The controller 780 may turn on the second switching element S2 and the third switching element S3 and turn off the first switching element S1 and the fourth switching element S4 during the other half period Ts / 2 of the switching period Ts. Thus, current may flow through the battery 760, the third switching element S3, the capacitor C, the coil 130, and the second switching element S2 along the second current path Path2.

[0153] The output of power converter 751 in the first mode can be greater than the output of power converter 751 in the second mode (described below). Therefore, the duty cycle in the first mode can be smaller than the duty cycle in the second mode to easily reduce the temperature of heat-sensitive body 110. In the preheating interval, since power converter 751 operates as a full-bridge circuit with a large output, rapid preheating can be performed.

[0154] Figure 14 1 is a diagram illustrating an operation method of the switching element in the second mode. Figure 15 and Figure 16 A diagram showing the flow of current according to the operation of a switching element.

[0155] Reference Figures 14 to 16 In the second mode, the controller 780 can control the switching elements S1 to S4 to operate the power converter 751 as a half-bridge circuit. In the second mode, the controller 780 can maintain the on / off state of the switching elements S3 and S4 in any link aggregation group and can cause the switching elements S1 and S2 in the other link aggregation group to operate complementarily.

[0156] The controller 780 may turn on the first switching element S1 and the fourth switching element S4 and turn off the second switching element S2 and the third switching element S3 in the half period Ts / 2 of the switching period Ts. Therefore, the current may flow along the third current path Path3 (refer to Figure 15 ) flows through the battery 760, the first switching element S1, the coil 130, the capacitor C and the fourth switching element S4.

[0157] The controller 780 can turn on the second switching element S2 and the fourth switching element S4 and turn off the first switching element S1 and the third switching element S3 in the other half period Ts / 2 of the switching period Ts. Therefore, the current can flow along the fourth current path Path4 (refer to Figure 16 ) flows through the fourth switching element S4, the capacitor C, the coil 130, and the second switching element S2. The fourth current path Path4 may be formed by energy stored in the capacitor C during the first half period Ts / 2 of the switching period Ts.

[0158] Figure 15 and Figure 16 It is only shown that the fourth switching element S4 is turned on and the third switching element S3 is turned off during the entire switching period Ts. However, according to one embodiment, the fourth switching element S4 may be turned off and the third switching element S3 may be turned on.

[0159] In the second mode, the second duty ratio may be set in such a manner as to maximize the efficiency of the power converter 751. For example, in the second mode, the second duty ratio may be set to approximately 50%.

[0160] Figure 17 FIG. 4 is a flow chart of an operating method of an aerosol generating device according to an embodiment.

[0161] Reference Figure 17 In step S1710 , during the preheating period, the controller 780 may control the switching element to enable the power converter 751 to operate in the first mode.

[0162] The preheating section may be a section in which the temperature 1020 of the heat-sensitive body 110 increases to the first target temperature. The first mode may be a mode in which the power converter 751 operates as a full-bridge circuit.

[0163] The output of the half-bridge circuit described below may be lower than that of the full-bridge circuit. Therefore, if the power converter 751 operates as a half-bridge circuit during the preheating period, the preheating performance (e.g., preheating time, preheating temperature, etc.) may not meet the desired level. Therefore, in the aerosol generating device 100, it is preferable that the power converter 751 operates as a full-bridge circuit with a higher output value during the preheating period.

[0164] The controller 780 may control the power converter 751 to increase the temperature of the heat-sensitive body 110 to the first target temperature in the preheating section.

[0165] The preheating interval may be divided into a first subinterval and a second subinterval subsequent to the first subinterval. The first subinterval may correspond to an interval in which the temperature of the heat-sensitive body 110 is within a range of about (Te 1-200)°C to about (Te 1-30)°C.

[0166] In the first subinterval, the controller 780 may control the power converter 751 based on the first submode. The first submode may be a mode in which the current supplied to the coil 130 is maintained below an upper limit to remove a ripple component.

[0167] In the first subinterval, controller 780 can control the duty cycle based on the target temperature while limiting the upper limit of the current supplied to coil 130 and maintaining the matching frequency at a fixed value. In the first subinterval, since the magnitude of the supplied current is limited to be less than or equal to the preset reference current, damage to battery 460 can be prevented.

[0168] In a second subinterval following the first subinterval, the controller 780 may control the power converter 751 based on a second submode. The second submode may be a mode in which current is not limited for rapid preheating. Alternatively, the second submode may be a mode in which temperature feedback control is performed to ensure that the temperature 1020 of the heat-sensitive body 110 reaches the first target temperature.

[0169] In the second sub-interval, while the duty cycle of power converter 751 is fixed at the first duty cycle, controller 780 can heat heat-sensitive body 110 by controlling at least one of the current supplied to coil 130 and the matching frequency based on the first target temperature. In the second sub-mode, controller 780 can perform feedback control based on the difference between the temperature of heat-sensitive body 110 and the first target temperature.

[0170] Since the first sub-mode and the second sub-mode correspond to the operation modes in the preheating interval, the power converter 751 can operate as a full-bridge circuit in both the first sub-mode and the second sub-mode.

[0171] In step S1720 , the controller 780 may control the switching element to operate the power converter 751 in the second mode during the smoking interval following the preheating interval.

[0172] The smoking interval may be a period during which a user actually takes a puff and the temperature of heat-sensitive element 110 is maintained within a preset smoking temperature range. The second mode may be a mode in which power converter 751 operates as a half-bridge circuit. Alternatively, the second mode may be a mode in which power converter 751 operates at maximum power efficiency to maintain the temperature of heat-sensitive element 110.

[0173] During the smoking period, the controller 780 may maintain the temperature of the heat-sensitive body 110 at the second target temperature by controlling the power converter 751 .

[0174] Controller 780 may fix the duty cycle of power converter 751 at a second duty cycle during the puff interval. The second duty cycle may be set to be greater than the first duty cycle. The second duty cycle may be set to maximize the power efficiency of power converter 751. For example, the second duty cycle may be set to approximately 50%.

[0175] During the smoking interval, while the duty cycle of the power converter 751 is fixed at the second duty cycle, the controller 780 can heat the heat-sensitive body 110 by controlling at least one of the current supplied to the coil 130 and the matching frequency based on the second target temperature. According to one embodiment, during the smoking interval, the controller 780 can perform feedback control based on the difference between the temperature of the heat-sensitive body 110 and the second target temperature while the duty cycle of the power converter 751 is fixed at the second duty cycle.

[0176] The output of a half-bridge circuit is lower than that of a full-bridge circuit. However, in the smoking range, maintaining the smoking temperature is more important than rapid preheating, and therefore, a half-bridge circuit is sufficiently suitable for maintaining the temperature. In addition, energy efficiency can be greatly improved compared to a case where power converter 751 operates only as a full-bridge circuit throughout the heating range.

[0177] Therefore, the aerosol generating device 100 according to one embodiment can improve power efficiency by changing the operating mode of the power converter 751 according to the temperature curve.

[0178] For maximum energy efficiency, the aerosol generating device 100 may set the first target temperature to be higher than the second target temperature and synchronize the interval change of the temperature profile with the change of the operating mode.

[0179] Specifically, controller 780 can change the operating mode of power converter 751 from the first mode to the second mode when the preheating interval changes to the smoking interval. The target temperature can be set to the first target temperature during the preheating interval and the second target temperature during the smoking interval. Therefore, the time when the preheating interval changes to the smoking interval can be the same as the time when the first target temperature changes to the second target temperature. In other words, controller 780 can change the operating mode of power converter 751 when the first target temperature changes to the second target temperature. Since the operating mode changes as the target temperature decreases, energy efficiency can be maximized.

[0180] Those skilled in the art of the present embodiment will appreciate that, without departing from the characteristics, various modifications may be made to the present invention in form or detail. Therefore, the disclosed method should only be considered as illustrative, not restrictive. The scope of the present invention is limited by the appended claims rather than the above description, and all differences within the scope of equivalence thereto should be considered as included in the present invention.

Claims

1. An aerosol generating device, wherein a receiving space for receiving an aerosol generating substrate is formed in the aerosol generating device, wherein: The heat-sensitive body included in the aerosol-generating substrate is heated by an induction heating method, and the aerosol-generating device comprises: a battery for providing DC power; a power converter configured to convert the DC power into AC power; a coil wound along the accommodating space and extending in a length direction of the aerosol generating device, wherein the coil is configured to heat the heat-sensitive body included in the aerosol generating substrate by applying an alternating magnetic field whose direction periodically changes according to the AC power converted by the power converter to the heat-sensitive body; and A controller configured to: control the current supplied to the coil based on an upper limit of the current in a portion of a preheating interval; and in a smoking interval following the preheating interval, with the duty cycle of the power converter fixed at a second duty cycle preset to 50%, perform feedback control based on a difference between the temperature of the heat-sensitive body and a target temperature in the smoking interval by controlling the current supplied to the coil, so that the temperature of the heat-sensitive body reaches the preset target temperature. 2 . The aerosol generating device according to claim 1 , further comprising a capacitor connected in series or in parallel to the coil for resonance with the heat-sensitive body.

3. The aerosol generating device according to claim 2, wherein: The controller is further configured to fix the matching frequency in some intervals of the preheating interval.

4. The aerosol generating device according to claim 3, wherein: The matching frequency is set to be higher than a resonance frequency of the coil and the capacitor by a preset magnitude.

5. The aerosol generating device according to claim 1, wherein The coil is a solenoid wound along the accommodation space, and the coil includes at least one of copper, silver, gold, aluminum, tungsten, zinc, and nickel.

6. The aerosol generating device according to claim 1, wherein The battery includes lithium iron phosphate. 7 . The aerosol generating device according to claim 1 , further comprising an interface unit comprising a port for exchanging data with an external device or receiving power from an external power source.

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