Aerosol generating device, heating control circuit, and heating control method for aerosol generating device

Abstract

The present invention relates to an aerosol generating device, a heating control circuit, and a heating control method for the aerosol generating device. The method comprises: in a first stage, executing the following steps: determining a resistance value of a heating body by means of a current sampling module, and determining a first target power of the heating body; determining a first target voltage value of the heating body on the basis of the resistance value and the first target power; and controlling a buck-boost module to output the first target voltage value, so as to heat the heating body; and in a second stage, executing the following steps: acquiring the current temperature of the heating body, and determining a target temperature of the heating body; determining a second target voltage value of the heating body on the basis of the current temperature and the target temperature; and controlling the buck-boost module to output the second target voltage value, so as to heat the heating body. In the present invention, the buck-boost module is used to heat the heating body, and unlike traditional PWM control methods, during heating, the current no longer undergoes a sudden change, thereby completely solving the noise problem caused by the sudden change of the current during heating, effectively reducing the noise generated by the heating body, and adjusting the taste.

Description

An aerosol generating device, a heating control circuit, and a heating control method thereof. Technical Field

[0001] This invention relates to the field of atomization technology, and in particular to an aerosol generating device, a heating control circuit, and a heating control method thereof. Background Technology

[0002] Currently, the temperature control method for heated non-combustible appliances is through PWM (Pulse Width Modulation). When the temperature is high, the PWM duty cycle is reduced to decrease the heating power, and when the temperature is low, the PWM duty cycle is increased to increase the heating power. However, because this PWM heating method involves the current abruptly changing from maximum to 0 and then back to maximum in each PWM cycle, the heating wire is prone to vibration and noise due to the Lorentz force. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide an aerosol generating device, a heating control circuit and a heating control method thereof, in order to address the above-mentioned deficiencies.

[0004] The technical solution adopted by this invention to solve its technical problem is: a heating control method for an aerosol generating device, comprising:

[0005] In the first phase, the following steps are performed:

[0006] The resistance of the heating element is determined by the current sampling module, as well as the first target power of the heating element.

[0007] The first target voltage value of the heating element is determined based on the resistance value and the first target power;

[0008] The buck-boost module is controlled to output the first target voltage value to heat the heating element.

[0009] In the second phase, the following steps are performed:

[0010] Obtain the current temperature of the heating element and determine the target temperature of the heating element;

[0011] A second target voltage value for the heating element is determined based on the current temperature and the target temperature;

[0012] The control buck-boost module outputs the second target voltage value to heat the heating element.

[0013] In some embodiments, the step of determining the resistance value of the heating element by means of a current sampling module includes:

[0014] The current heating current and current heating voltage of the heating element are obtained by a current sampling module connected in series with the heating element, and the resistance value of the heating element is determined based on the current heating current and the current heating voltage.

[0015] In some embodiments, the step of determining the first target power of the heating element includes:

[0016] Determine the first target power required by the heating element at the current time based on the preset power curve;

[0017] Wherein, the preset power curve is a time-power relationship curve; and / or

[0018] The step of determining the target temperature of the heating element includes:

[0019] Determine the target temperature required by the heating element at the current time based on the preset temperature curve;

[0020] The preset temperature curve is a curve showing the relationship between time and temperature.

[0021] In some embodiments, the step of determining a second target voltage value for the heating element based on the current temperature and the target temperature includes:

[0022] Based on the PID algorithm, the second target power of the heating element is calculated according to the current temperature and the target temperature;

[0023] The second target voltage value is determined based on the resistance value and the second target power.

[0024] In some embodiments, the first stage is the time period from 0 to t1, and the second stage is the time period from t1 to the end of the heating of the current aerosol forming matrix.

[0025] In some embodiments, the duration of the first phase is shorter than the duration of the second phase.

[0026] In addition, the present invention also provides a heating control circuit, including a controller, a current sampling module, a heating element, a temperature measuring element, and a step-up / step-down module. The input terminal of the step-up / step-down module is used to connect to a power supply component, the control output terminal of the controller is connected to the step-up / step-down module, and the three signal input terminals of the controller are respectively connected to the current sampling module, the positive electrode of the heating element, and the temperature measuring element.

[0027] The temperature sensing element is used to acquire the current temperature of the heating element and transmit it to the controller;

[0028] The controller is used to perform the steps of the heating control method for the aerosol generating apparatus as described above.

[0029] In addition, the present invention also provides an aerosol generating apparatus, comprising:

[0030] A heating structure for heating an aerosol forming matrix, the heating structure comprising a heating element having a heating part, a tube body sleeved around the outer periphery of the heating part and transmitting infrared light, the tube body being spaced apart from at least a portion of the heating part; the heating part having a heating element;

[0031] Such as the heating control circuit described above;

[0032] A power supply component connected to the step-up / step-down module for supplying power to the heating structure;

[0033] A temperature sensing element connected to the controller for detecting the temperature of the heating element.

[0034] In some embodiments, the heating structure further includes:

[0035] A support member, at least partially installed in the tube body to support the heating element, is arranged sequentially with the heating part along the axial direction of the tube body. The support member has a first end and a second end in the axial direction, the first end being disposed close to the heating part and the second end being disposed away from the heating part.

[0036] The temperature sensing element is a temperature sensing membrane, which is disposed at the first end of the support member.

[0037] In some embodiments, the temperature-sensing membrane covers a portion of the outer wall of the support member circumferentially; and / or

[0038] The first end has an end face, and the temperature measuring film extends to at least a portion of the end face.

[0039] In some embodiments, the temperature-sensing membrane is in contact with a portion of the inner wall of the tube; or

[0040] A gap is left between the temperature measuring membrane and the inner wall of the tube;

[0041] The width of the gap is greater than 0 and less than or equal to 0.3 mm.

[0042] In some embodiments, the temperature sensing element is a thermocouple.

[0043] In some embodiments, the heating structure further includes a fixing member, which is at least partially installed in the tube body, and the fixing member includes a first end and a second end disposed opposite to each other, the first end being disposed toward the heating part; a positioning structure for positioning and installing the temperature measuring element is provided on the first end;

[0044] The temperature sensing element extends at least partially from the first end to the second end, and the temperature sensing element has a temperature sensing portion; the temperature sensing portion is at least partially disposed on the positioning structure.

[0045] The aerosol generating device, heating control circuit and heating control method of the present invention have the following beneficial effects: The present invention uses a step-up and step-down module to heat the heating element, which is different from the traditional PWM control method. The current no longer changes abruptly during heating, which can completely solve the noise problem caused by the sudden change of current during heating, effectively reduce the noise generated by the heating element and adjust the taste. Attached Figure Description

[0046] The present invention will be further described below with reference to the accompanying drawings and embodiments. In the accompanying drawings:

[0047] Figure 1 is a schematic flowchart of a heating control method for an aerosol generating apparatus according to an embodiment of the present invention;

[0048] Figure 2 is a schematic diagram of the heating control circuit provided in an embodiment of the present invention;

[0049] Figure 3 is a schematic diagram of preset power curves and preset temperature curves in some embodiments of the present invention;

[0050] Figure 4 is a schematic diagram of the heating structure of the aerosol generating device in some embodiments of the present invention;

[0051] Figure 5 is a cross-sectional view of the heating structure shown in Figure 4;

[0052] Figure 6 is a structural exploded view of the heating structure shown in Figure 5;

[0053] Figure 7 is a diagram showing the cooperation between the support component and the temperature measuring element shown in Figure 6;

[0054] Figure 8 is a schematic diagram of the temperature sensing element structure shown in Figure 7;

[0055] Figure 9 is a partial structural schematic diagram of the heating structure in another embodiment of the present invention;

[0056] Figure 10 is a schematic diagram of the fixing structure of the heating structure shown in Figure 9. Detailed Implementation

[0057] To provide a clearer understanding of the technical features, objectives, and effects of the present invention, specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0058] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of the invention. However, those skilled in the art will understand that the invention can be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods are omitted so as not to obscure the description of the invention with unnecessary detail.

[0059] To facilitate understanding of the present invention, a more complete description will be provided below. The invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that the disclosure of the present invention will be more thorough and complete.

[0060] It should be noted that when an element is described as being "fixed to" another element, it can be directly on the other element, or one or more intermediate elements may exist between them. When an element is described as being "connected to" another element, it can be directly connected to the other element, or one or more intermediate elements may exist between them. When terms such as "vertical," "horizontal," "left," "right," "upper," "lower," "inner," "outer," and "bottom" are used to indicate orientation or positional relationships, this is based on the orientation or positional relationships shown in the accompanying drawings and is only for ease of description, not to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0061] It should be understood that although the terms first, second, third, etc., may be used in embodiments of the present invention to describe various information, this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. No such actual relationship or order between these entities or operations is necessarily required or implied.

[0062] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

[0063] Referring to Figure 1, in one embodiment of the present invention, the heating control method of the aerosol generating device is applied in the controller 200 of the aerosol generating device. The heating control method of the aerosol generating device in this embodiment includes:

[0064] In the first phase, the following steps are performed:

[0065] S11. The resistance of the heating element is determined by the current sampling module 300, and the first target power of the heating element is determined.

[0066] Understandably, the step of determining the resistance of the heating element using a current sampling module includes:

[0067] The current heating current and current heating voltage of the heating element are obtained by the current sampling module 300 connected in series with the heating element, and the resistance value of the heating element is determined based on the current heating current and current heating voltage.

[0068] The step of determining the first target power of the heating element includes: determining the first target power required by the heating element at the current time based on a preset power curve. The preset power curve is a curve relating time and power.

[0069] S12. Determine the first target voltage value of the heating element based on the resistance value and the first target power.

[0070] S13. Control the buck-boost module 100 to output the first target voltage value so that the heating element is heated.

[0071] Referring to Figures 2 and 3, the first stage is the time period from 0 to t1. During this period, power control is employed. The controller 200 measures the current heating current I of the heating wire through the current sampling module and the current heating voltage U of the heating wire through VS2. According to Ohm's law R=U / I, the resistance R of the heating element can be obtained. When controlling the power, the controller 200 obtains the first target power P required for the current time based on the preset power curve. Then, according to P=U² / R, the first target voltage U to be supplied to the heating wire can be calculated. The controller then controls the step-up / step-down module 100 to output the first target voltage U, thus enabling the heating wire to heat at the preset power, achieving power control.

[0072] It should be noted that, as shown in Figure 3, the preset power curve includes multiple sub-power segments with different power values ​​and different durations. By adjusting the power value and duration of the sub-power segments as well as the total duration of the first stage, the energy ratio of thermal radiation and thermal conduction output in the infrared-transmitting quartz tube can be adjusted, which helps to adjust the taste of the generated aerosol.

[0073] In the second phase, the following steps are performed:

[0074] S21. Obtain the current temperature of the heating element through the temperature sensing element 40, and determine the target temperature of the heating element.

[0075] Understandably, the step of determining the target temperature of the heating element includes: determining the target temperature required for the heating element at the current time based on a preset temperature curve. The preset temperature curve is a curve showing the relationship between time and temperature.

[0076] S22. Determine the second target voltage value of the heating element based on the current temperature and the target temperature.

[0077] Optionally, the step of determining the second target voltage value of the heating element based on the current temperature and the target temperature includes:

[0078] Based on the PID algorithm, the second target power of the heating element is calculated according to the current temperature and the target temperature. Then, the second target voltage value is determined based on the resistance of the heating element obtained from the first stage and the second target power.

[0079] S23. Control the buck-boost module 100 to output the second target voltage value so that the heating element is heated.

[0080] This embodiment uses a boost / buck module to regulate the heating of the heating element during the heating process from the start to the end of the aerosol matrix formation heating, which is different from the traditional PWM control method. This prevents the current from changing abruptly during heating, completely solves the noise problem caused by the sudden change in current during heating, effectively reduces the noise generated by the heating element, and adjusts the taste.

[0081] Referring to Figures 2 and 3, the second stage is the time period t1 - the end time of heating the current aerosol-forming matrix. Temperature control is used in the aerosol generating device during this second stage. The temperature control process is as follows: After measuring the current temperature of the heating element using a thermocouple or PVD temperature-sensing film, the target temperature to be controlled is obtained according to a preset temperature curve. Then, the second target output power is obtained using a PID algorithm. The power is then converted into voltage using the aforementioned power control algorithm, and the corresponding voltage is output by controlling the step-up / step-down module 100, thus completing the temperature control.

[0082] Understandably, if the current temperature is higher than the target temperature, the power supplied to the heating element is reduced, meaning a second target power, smaller than the current power, is output to the heating element to heat it. The output voltage V (second target voltage value) of the buck-boost module 100 can be adjusted downwards according to P=V*V / R. In other words, the magnitude of the output voltage V of the buck-boost module 100 depends on the second target power P (i.e., V*V / R). If V>V bat If the voltage is increased, the boost / buck module will boost the voltage by 100; otherwise, it will depressurize.

[0083] In other words, this invention regulates power by adjusting the voltage output of the buck-boost module 100, which continuously outputs voltages of varying magnitudes. Whether it's a boost or buck converter depends on the cell voltage. If the required output voltage of the buck-boost module 100 is higher than the cell voltage, it's a boost; conversely, it's a buck converter. For example, if a 4V DC output is required, and the cell voltage is below 4V, it's a boost to 4V; if the cell voltage is at least 4.2V, it's a buck converter to 4V.

[0084] Preferably, the duration of the first stage is shorter than the duration of the second stage. The time t1 is not necessarily related to the preheating completion time; the length of t1 is more determined by the taste.

[0085] This embodiment uses a boost / buck module to regulate the heating of the heating element from the start to the end of heating the aerosol formation matrix. This eliminates sudden changes in current during heating, completely resolving the noise problem caused by these sudden current fluctuations, effectively reducing noise from the heating element, and adjusting the flavor. Furthermore, this embodiment can increase the atomization speed and atomization volume at the front of the atomizing substrate in the first stage, and improve atomization consistency in the middle stage of atomization in the second stage.

[0086] The aerosol generating device implementing this method also has a suction detection function.

[0087] In this embodiment, a buck-boost module 100 is used to directly heat the heating element, eliminating the need for PWM. The current no longer changes abruptly during heating; power and temperature are controlled by adjusting the heating voltage in real time to heat the heating element. Since the buck-boost module 100 can both boost and buck voltages, it can output any voltage to the heating element when powered by a battery, making it suitable for power control of the heating element in this solution.

[0088] It should be noted that the power curve and temperature curve shown in Figure 3 are only used as one embodiment for method illustration. That is, the preset power curve and preset temperature curve in this solution are not limited to the trends shown in the figure. The specific trends are not limited here and can be set according to the actual needs of the user, aerosol generating device, or taste.

[0089] As shown in Figure 2, in another embodiment of the present invention, the heating control circuit of this embodiment includes a controller 200, a current sampling module 300, a heating element, a temperature measuring element 40, and a step-up / step-down module 100. The input terminal of the step-up / step-down module 100 is used to connect to the power supply component. The control output terminal of the controller 200 is connected to the step-up / step-down module 100. The three signal input terminals of the controller 200 are respectively connected to the current sampling module 300 (corresponding to VS1 in Figure 2), the positive electrode of the heating element (corresponding to VS2 in Figure 2), and the temperature measuring element 40 (corresponding to VS3 in Figure 2).

[0090] The temperature sensing element 40 is used to obtain the current temperature of the heating element and transmit it to the controller 200.

[0091] The controller 200 is used to execute the steps of the heating control method for the aerosol generating apparatus as described in the above embodiments.

[0092] The heating control circuit of this embodiment can use a step-up / step-down module to adjust the heating of the heating element from the start to the end of heating the aerosol matrix. Unlike the traditional PWM control method, the current no longer changes abruptly during heating, which can completely solve the noise problem caused by the sudden change of current during heating, effectively reduce the noise generated by the heating element, and adjust the atomized taste.

[0093] In another embodiment of the present invention, the aerosol generating apparatus of this embodiment includes:

[0094] A heating structure 1 for heating an aerosol-forming matrix, as shown in Figures 4 to 6, includes a heating element 20 having a heating section 21 and a tube 10 sleeved around the heating section 21 and emitting infrared light. The tube 10 is spaced apart from at least a portion of the heating section 21. The heating section 21 has a heating element 211.

[0095] The heating control circuit as described in the above embodiment.

[0096] A power supply component connected to the step-up / step-down module 100 for supplying power to the heating structure 1.

[0097] A temperature sensing element 40 connected to the controller 200 for detecting the temperature of the heating element 211.

[0098] The heating element 21 in the aerosol generating device of this embodiment can simultaneously heat the aerosol forming matrix using both infrared radiation and heat conduction. Specifically, it allows for different preset power curves or different output durations t1 in the first stage for different types of aerosol forming matrices, which helps to control the proportion of infrared radiation energy and heat conduction energy in the total output energy, thus improving the taste of the first few puffs. Furthermore, unlike traditional PWM control, this embodiment uses a boost / buck module to heat the heating element 21. This eliminates sudden current changes during heating, completely resolving the noise problem caused by sudden current changes during heating, effectively reducing the noise generated by the heating element, and adjusting the atomized taste.

[0099] It should be noted that the aerosol generating device can heat the aerosol generating substrate using a heating-without-combustion method. In some embodiments, the aerosol generating substrate can be columnar, and can be a solid material in the form of strips, flakes, granules, or integral molding made from the leaves and / or stems of plants (such as tobacco), and aroma components can be further added to the solid material. The aerosol generating device may include a heating structure 1 and a power supply component (not shown). The heating structure 1 can be at least partially inserted into the aerosol generating substrate and heats the aerosol generating substrate by radiating infrared light, so that the aerosol generating substrate generates aerosol for the user to inhale. The power supply component (not shown) is connected to the heating structure 1 to supply power to the heating structure 1.

[0100] In some embodiments, the heating structure 1 further includes a support member 30, which is at least partially installed in the tube body 10 to support the heating element 20. It is arranged sequentially with the heating part 21 along the axial direction of the tube body 10. The support member 30 has a first end 30a and a second end 30b in the axial direction. The first end 30a is disposed close to the heating part 21, and the second end 30b is disposed away from the heating part 21.

[0101] When powered on, the heating element 20 can rapidly heat up to approximately 1000℃, while the surface temperature of the tube body 10 can be controlled at approximately 350℃. The atomization temperature of the aerosol generating substrate is controlled at 300-350℃, achieving precise atomization of the aerosol generating substrate primarily in the infrared 2-4.75µm and 8-11µm wavelength bands. The tube body 10 covers at least a portion of the heating element 20 and allows infrared light to penetrate into the aerosol generating substrate. The support member 30 can be at least partially installed in the tube body 10 and assembled with the heating element 20, providing support for the heating element 20. The temperature sensing element 40 is at least partially installed in the tube body 10 and positioned on the support member 30, enabling monitoring of the temperature within the tube body 10.

[0102] In some embodiments, the tube 10 can be a quartz glass tube. Of course, it is understood that in other embodiments, the tube 10 is not limited to an infrared-transmitting quartz tube, but can be other window materials that allow light waves to pass through, such as transparent ceramics, diamond, etc.

[0103] In some embodiments, the tube body 10 may cover the outer periphery of a portion of the heating element 20 to form a heating structure, preventing the heating element 20 from directly contacting the aerosol generating substrate. The tube body 10 and the portion of the heating element 20 are spaced apart, and the tube body 10 includes a main body 11 and a pointed tip 12. The main body 11 may be cylindrical and hollow. It is understood that in some other embodiments, the main body 11 is not limited to being cylindrical, but may be cuboid or other shapes. The pointed tip 12 is disposed at one end of the main body 11. By providing the pointed tip 12, it is easy to insert or remove at least a portion of the heating structure 1 into the aerosol generating substrate. The pointed tip 12 may be conical. In some embodiments, a receiving cavity 13 is formed inside the tube body 10. The receiving cavity 13 is a cylindrical receiving cavity and may be non-sealed. When the heating element 20 is installed therein, the receiving cavity 13 does not need to be evacuated or filled with inert gas. In this embodiment, the tube body 10 has a tube opening 14, which is located at the end of the main body 11 away from the tip 12 and communicates with the receiving cavity 13 for the heating element 20 to be installed in the receiving cavity 13.

[0104] In some embodiments, the heating element 20 may include a heating portion 21. The heating portion 21 is disposed in the tube body 10 and is at least partially spaced from the tube wall of the tube body 10. Specifically, the heating portion 21 may be spaced from the tube wall of the main body 11 as a whole, and can radiate infrared light when energized. The infrared light can pass through the tube body 10 to the aerosol generating matrix. In some embodiments, the heating portion 21 is generally columnar or cylindrical, and may be generally helical columnar, formed by winding at least one infrared-radiating heating element 211. The heating portion 21 is provided with a central rod 212, which is coaxially disposed with the heating portion 21 and can extend from both ends of the heating portion 21 and connect to one end of the heating portion 21 facing the pointed tip 12. In some embodiments, the central rod 212 may be a conductor or a resistive heating element.

[0105] The heating element 20 may include a first electrical connection portion 22 and a second electrical connection portion 23. Both the first electrical connection portion 22 and the second electrical connection portion 23 are located at the end of the heating element 21 away from the pointed tip 12 and can extend through the opening 14. The first electrical connection portion 22 can be connected to the central rod 212, and the second electrical connection portion 23 can be connected to the end of the heating element 21 away from the pointed tip 12. The first electrical connection portion 22 and the second electrical connection portion 23 can be conductive wires or conductive posts, etc. The first electrical connection portion 22 can be welded to the central rod 212, and the second electrical connection portion 23 can be welded to one end of the heating element 211.

[0106] In some embodiments, the support member 30 may be columnar and may be at least partially installed from the port 14 into the tube body 10, supporting and fixing the heating element 20. In some embodiments, the support member 30 may be disposed near the port 14 and sequentially disposed with the heating element 21 along the axial direction of the tube body 10. In some embodiments, the support member 30 may be an integral insulating member, used to insulate the first electrical connection 22 and the second electrical connection 23. The support member 30 may be made of ceramic, quartz, or high-temperature resistant plastic. The cross-section of the support member 30 is generally circular, and its outer diameter may be equivalent to the inner diameter of the tube body 10. In some embodiments, the support member 30 has a first end 30a and a second end 30b. The first end 30a and the second end 30b are disposed opposite each other and located axially on the support member 30. The first end 30a may be disposed near the heating element 21, and the second end 30b may be disposed away from the heating element 21, located on the outer side of the tube body 10.

[0107] In some embodiments, a first channel 31 may be provided on the support member 30, which extends along the axial direction of the support member 30 from a first end 30a to a second end 30b. The first channel 31 may be defined by a central through-hole in the support member 30. The first channel 31 can be used for the passage of the first electrical connection portion 22. In some embodiments, the first channel 31 may be omitted. The first channel 31 can be used to fix the first electrical connection portion 22 to the support member 30 by applying adhesive, preventing displacement of the heating element 20 during assembly.

[0108] In some embodiments, a second channel 32 may be provided on the support member 30. This second channel 32 extends axially from the first end 30a to the second end 30b of the support member 30, and may be radially spaced from the first channel 31. The second channel 32 can be used for the passage of the second electrical connection portion 23. The second channel 32 may be defined by a through-slot formed on the side wall of the support member 30. The second channel 32 can be used to fix the second electrical connection portion 23 to the support member 30 by applying adhesive, preventing displacement of the heating element 20 during assembly.

[0109] As shown in Figures 7 and 8, in some embodiments, the temperature sensing element 40 may include a temperature sensing film 41. This temperature sensing film 41 may be a TCR temperature sensing film. It should be noted that TCR refers to temperature coefficient resistance, and a TCR temperature sensing film can be made of a material with a high temperature coefficient resistance. The temperature sensing film 41 is disposed at the first end 30a of the support member 30, and can be used to monitor the temperature in the tube body 10, improving the sensitivity and accuracy of temperature measurement. Specifically, the temperature sensing film 41 may cover a portion of the outer wall of the support member 30 along its circumference. Specifically, in some embodiments, it may be formed on the support member 30 using processes such as PVD or printing. In some embodiments, the first end 30a of the support member 30 has an end face, and the temperature sensing film 41 may extend to at least a portion of the end face of the first end 30a, that is, the end face of the first end 30a may be covered by the temperature sensing film 41. The temperature sensing film 41 may contact a portion of the inner wall of the tube body 10, that is, the outer periphery of the temperature sensing film 41 may be in contact with the inner wall of the tube body 10 and its opposite side. In some other embodiments, the temperature measuring membrane 41 may also have a gap between it and at least a portion of the inner wall of the tube 10, the width of which may be greater than 0 and less than or equal to 0.3 mm.

[0110] The temperature sensing element 40 may include two conductive units 42, which are spaced apart circumferentially from the temperature sensing film 41 and both connected to the film. Each conductive unit 42 may be at least partially disposed on the support member 30 and extend along the axial direction of the support member 30. The two conductive units 42 may be insulated from each other by the support member 30. In some embodiments, each conductive unit may include a first conductive portion 421 and a second conductive portion 422, which may be two conductive elements made of different materials. The first conductive portion 421 may be disposed on the surface of the support member 30, with one end connected to the temperature sensing film 41 and the other end extending to the second end 30b of the support member 30. In some embodiments, the first conductive portion 421 may be a conductive sheet or conductive film covering the support member 30, such as a copper sheet or copper foil; or a conductive coating, such as a conductive metal coating, applied to the outer wall of the support member 30. The second conductive portion 422 can be connected to the first conductive portion 421 and can be columnar, extending from the opening 14 to the outside of the tube body 10. The second conductive portion 422 can be a conductive wire or a conductive post. In some other embodiments, the first conductive portion 421 or the second conductive portion 422 of the conductive unit 42 can be omitted, that is, the conductive unit 42 can be a single conductive element.

[0111] In some embodiments, the heating structure 1 further includes a fixing flange 50, which is sleeved on the end of the tube body 10 having the opening 14 and on the section of the support member 30 extending out of the tube body 10, supporting both the tube body 10 and the support member 30. A limiting step 51 is provided inside the fixing flange 50, and the end of the tube body 10 having the opening 14 can abut against the limiting step 51. The tube body 10 and the fixing flange 50 can be bonded and fixed together by a first adhesive 60. The first adhesive 60 can be a paste-like adhesive, which serves to fix and seal. The gap between the support member 30 and the inner wall of the fixing flange 50 is less than or equal to 0.2 mm. In some embodiments, the support member 30 and the fixing flange 50 can be bonded and fixed together by a second adhesive 70. The second adhesive 70 can be a paste-like adhesive, which also serves to fix and seal.

[0112] As shown in Figures 9 and 10, in some embodiments, the temperature sensing element 40 can be a thermocouple. In this embodiment, the heating structure 1 further includes a fixing member 1032, which is at least partially installed in the tube body 10. The fixing member 1032 includes a first end 32a and a second end 32b disposed opposite to each other, with the first end 32a facing the heating part 21. A positioning structure 321 for positioning and installing the temperature sensing element 40 is provided on the first end 32a.

[0113] The temperature sensing element 40 extends at least partially from the first end 32a to the second end 32b, and the temperature sensing element 40 has a temperature sensing section 311. The temperature sensing section 311 is at least partially disposed on the positioning structure 321.

[0114] In this embodiment, the fixing member 1032 may be columnar. The fixing member 1032 may include a first end 32a and a second end 32b respectively. When the fixing member 1032 is assembled with the tube body 10, the first end 32a may be inserted into the cavity from the tube opening 14 and may be located at the end of the heating part 21 of the heating element 20 facing the tube opening 14.

[0115] In this embodiment, the thermocouple may extend at least partially from the first end 32a to the second end 32b. In some embodiments, the temperature sensing element 40 may include a temperature sensing portion 311, a first electrical connection portion 312, and a second electrical connection portion 313. The temperature sensing portion 311 is at least partially disposed at the first end 32a. Specifically, in some embodiments, the temperature sensing portion 311 is exposed at the first end 32a, and when the temperature sensing element 40 is assembled with the tube body 10, the temperature sensing portion 311 may be placed in the tube body 10 and located between the heating portion 21 and the tube opening 14. The temperature sensing portion 311 is generally cylindrical or spherical. The first electrical connection portion 312 and the second electrical connection portion 313 are connected to the temperature sensing portion 311 and are spaced apart. Specifically, the first electrical connection portion 312 and the second electrical connection portion 313 are connected to the side of the temperature sensing portion 311 away from the heating portion 21. Both the first electrical connection portion 312 and the second electrical connection portion 313 extend from the first end 32a of the fixing member 1032 to the second end 32b of the fixing member 1032, and can be used to connect to a power supply component (not shown). In some embodiments, both the first electrical connection portion 312 and the second electrical connection portion 313 can be leads. Of course, it is understood that in some other embodiments, the first electrical connection portion 312 and the second electrical connection portion 313 are not limited to lead cores, but can be conductive needles.

[0116] In this embodiment, a first insulating structure 314 may be provided on a portion of the first electrical connection portion 312. The length of the first insulating structure 314 is less than the length of the first electrical connection portion 312. After wrapping around the first electrical connection portion 312, one end of the first insulating structure 314 is at a predetermined distance from the temperature measuring portion 311. That is, the portion of the first electrical connection portion 312 adjacent to the temperature measuring portion 311 can be exposed. In other embodiments, the outer wall of the first electrical connection portion 312 may be entirely wrapped by the first insulating structure 314. In some embodiments, the first insulating structure 314 may be an insulating sheath, such as rubber. By providing the first insulating structure 314, the insulation between the first electrical connection portion 312 and the second electrical connection portion 313 can be facilitated.

[0117] In this embodiment, a second insulating structure 315 may be provided on a portion of the second electrical connection portion 313. The length of the second insulating structure 315 is shorter than the length of the second electrical connection portion 313. After wrapping around the second electrical connection portion 313, one end of the insulating structure 315 is at a predetermined distance from the temperature measuring portion 311. That is, the portion of the second electrical connection portion 313 adjacent to the temperature measuring portion 311 can be exposed. In other embodiments, the outer wall of the second electrical connection portion 313 may be entirely wrapped by the second insulating structure 315. In some embodiments, the second insulating structure 315 may be an insulating sheath, such as rubber. By providing the second insulating structure 315, the insulation between the first electrical connection portion 312 and the second electrical connection portion 313 can be facilitated.

[0118] In this embodiment, the temperature sensing element 40 may further include a third insulating structure 316, which may be sleeved on at least a portion of the first electrical connection portion 312 and the second electrical connection portion 313. Specifically, the third insulating structure 316 may wrap around a portion of the first electrical connection portion 312 and the second electrical connection portion 313 together. The third insulating structure 316 may be disposed on the outer periphery of the first insulating structure 314 and the second insulating structure 315. When the temperature sensing element 40 is assembled with the fixing member 1032, the temperature sensing element 40 can be tightly fitted with the fixing member 1032 through the third insulating structure 316. This prevents the temperature sensing element 40 from moving axially and radially within the fixing member 1032, keeping the position of the temperature sensing element 40 consistent before and after use, thereby ensuring accurate temperature detection. In some embodiments, the third insulating structure 316 may be an insulating layer, such as rubber.

[0119] In this embodiment, the fastener 1032 can be an insulating component as a whole, specifically, it can be made of ceramic. Of course, it is understood that in some other embodiments, the fastener 1032 is not limited to ceramic, and can be made of other high-temperature resistant insulating materials. The cross-section of the fastener 1032 is approximately the same as the cross-sectional shape of the tube 10. The cross-section of the fastener 1032 can be approximately circular.

[0120] In this embodiment, the positioning structure 321 may include a first positioning part 321a and a second positioning part 321b. Both the first positioning part 321a and the second positioning part 321b protrude from the first end 32a and are connected. The length of the second positioning part 321b protruding from the first end 32a is greater than the length of the first positioning part 321a, meaning they can be arranged in a stepped manner. In this embodiment, the first positioning part 321a and the second positioning part 321b can be an integral structure. In other embodiments, the first positioning part 321a and the second positioning part 321b can also be separate structures, detachably connected by a connecting structure. In some embodiments, the first positioning part 321a and the second positioning part 321b can also be spaced apart.

[0121] In this embodiment, a guide channel 322 is provided on the fixing member 1032. The guide channel 322 can be formed on the side wall of the fixing member 1032 and can be a guide groove. The guide channel 322 extends from the first end 32a to the second end 32b of the fixing member 1032. There can be one guide channel 322, which is used to install the first electrical connection part 312 and the second electrical connection part 313, and to lead out the first electrical connection part 312 and the second electrical connection part 313. Specifically, the first electrical connection part 312 and the second electrical connection part 313 can be partially installed in the guide channel 322, and the third insulating structure 316 on the outer periphery of the two can be in close contact with the groove wall of the guide channel 322, so that the temperature sensing element 40 can be tightly fitted with the fixing member 1032. In some other embodiments, the guide channel 322 is not limited to one, but can be two, which can be provided one-to-one with the first electrical connection part 312 and the second electrical connection part 313.

[0122] Those skilled in the art will further recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both. To clearly illustrate the interchangeability of hardware and software, the components and steps of the various examples have been generally described in terms of functionality in the foregoing description. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementations should not be considered beyond the scope of this invention.

[0123] The steps of the methods or algorithms described in conjunction with the embodiments disclosed herein can be implemented directly by hardware, a software module executed by a processor, or a combination of both. The software module can be located in random access memory (RAM), main memory, read-only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or any other form of storage medium known in the art.

[0124] It is understood that the above embodiments only illustrate preferred embodiments of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can freely combine the above technical features without departing from the concept of the present invention, and can also make several modifications and improvements, all of which fall within the protection scope of the present invention. Therefore, all equivalent transformations and modifications made with respect to the scope of the claims of the present invention should fall within the scope of the claims of the present invention.

Claims

1. A heating control method of an aerosol generating device, the method comprising: determining a heating profile of a heater based on a type of an aerosol generating article; and controlling the heater based on the determined heating profile. Comprising: In the first stage, the following steps are performed: Determine the resistance value of the heating body through the current sampling module, and determine the first target power of the heating body; Determine the first target voltage value of the heating body according to the resistance value and the first target power; Control the boost-buck module to output the first target voltage value to heat the heating body; In the second stage, the following steps are performed: Obtain the current temperature of the heating body and determine the target temperature of the heating body; Determine the second target voltage value of the heating body according to the current temperature and the target temperature; Control the boost-buck module to output the second target voltage value to heat the heating body. 2.The heating control method of the aerosol generating device of claim 1, wherein, In the step of determining the resistance value of the heating body through the current sampling module, comprising: Obtain the current heating current of the heating body through the current sampling module connected in series with the heating body, and obtain the current heating voltage of the heating body, and determine the resistance value of the heating body according to the current heating current and the current heating voltage. 3.The heating control method of the aerosol generating device of claim 1, wherein, In the step of determining the first target power of the heating body, comprising: Determine the first target power required by the heating body at the current time according to the preset power curve; Wherein, the preset power curve is a time-power relationship curve; and / or In the step of determining the target temperature of the heating body, comprising: Determine the target temperature required by the heating body at the current time according to the preset temperature curve; Wherein, the preset temperature curve is a time-temperature relationship curve. 4.The heating control method of the aerosol generating device of claim 1, wherein, In the step of determining the second target voltage value of the heating body according to the current temperature and the target temperature, comprising: Calculate the second target power of the heating body according to the current temperature and the target temperature based on the PID algorithm; Determine the second target voltage value according to the resistance value and the second target power. 5.The heating control method of the aerosol generating device of claim 1, wherein, The first stage is a time period of 0-t1, and the second stage is a time period of t1-current time when the heating of the aerosol-forming substrate ends. 6.The heating control method of the aerosol generating device of claim 1, wherein, The duration of the first stage is less than the duration of the second stage.

7. A heating control circuit, characterized by Comprising a controller, a current sampling module, a heating body, a temperature measuring element and a boost-buck module, the input end of the boost-buck module is used to connect a power supply component, the control output end of the controller is connected to the boost-buck module, and the three signal input ends of the controller are connected to the current sampling module, the positive electrode of the heating body and the temperature measuring element respectively; The temperature measuring element is used to obtain the current temperature of the heating body and transmit it to the controller; The controller is used to perform the steps of the heating control method of the aerosol generating device according to any one of claims 1 to 6.

8. An aerosol-generating device comprising: Comprising: A heating structure (1) for heating an aerosol-forming substrate, the heating structure (1) comprising a heating element (20) having a heating portion (21), a tube body (10) sleeved on the outer periphery of the heating portion (21) and transparent to infrared light, and the tube body (10) is arranged in a spaced manner with at least part of the heating portion (21); the heating portion (21) has a heating body (211); The heating control circuit according to claim 7; A power supply component connected with the boost-buck module and used to provide power supply to the heating structure (1); A temperature measuring element (40) connected with the controller and configured to detect the temperature of the heat generating body (211).

9. The aerosol-generating device of claim 8, wherein, The heat generating structure further comprises: a support (30) at least partially installed in the pipe body (10) to support the heat generating element (20), and sequentially arranged with the heat generating part (21) along the axial direction of the pipe body (10), the support (30) has a first end (30a) and a second end (30b) in the axial direction, the first end (30a) is arranged close to the heat generating part (21), and the second end (30b) is arranged away from the heat generating part (21); the temperature measuring element (40) is a temperature measuring film (41), and the temperature measuring film (41) is arranged at the first end (30a) of the support (30). 10.The aerosol-generating device of claim 9, wherein, The temperature measuring film (41) is wrapped around the outer wall of part of the support (30) along the circumferential direction of the support (30); and / or the first end (30a) has an end face, and the temperature measuring film (41) extends to at least part of the end face. 11.The aerosol-generating device of claim 9, wherein, The temperature measuring film (41) is in contact with part of the inner wall of the pipe body (10); or a gap is provided between the temperature measuring film (41) and the inner wall of the pipe body (10); the width of the gap is greater than 0 and less than or equal to 0.3 mm. 12.The aerosol-generating device of claim 8, wherein, The temperature measuring element (40) is a thermocouple.

13. The aerosol-generating device of claim 12, wherein, The heat generating structure (1) further comprises a fixing member (1032) at least partially installed in the pipe body (10), and the fixing member (1032) comprises a first end (32a) and a second end (32b) arranged oppositely, the first end (32a) is arranged towards the heat generating part (21); the first end (32a) is provided with a positioning structure (321) for positioning and installing the temperature measuring element (40); the temperature measuring element (40) at least partially extends from the first end (32a) to the second end (32b), and the temperature measuring element (40) has a temperature measuring part (311); the temperature measuring part (311) is at least partially arranged on the positioning structure (321).

Images