An induction heating device, an aerosol generation system and a control method

Abstract

The application provides an inductive heating device, an aerosol generating system and a control method, the device is used for heating an aerosol generating article containing a magnetic metal susceptor, and comprises an alternating current power supply module, an excitation winding, a detection winding and a voltage measurement module; after the aerosol generating article is loaded into the inductive heating device, the magnetic metal susceptor contained in the aerosol generating article is located in the space of the excitation winding; the length direction of the magnetic metal susceptor is parallel to the axes of the excitation winding and the detection winding; the Curie temperature of the magnetic metal is greater than 200 DEG C; the temperature measurement precision is high, the influence of parasitic parameters of components on the measurement precision is eliminated, the influence of the position change of the magnetic metal susceptor on the measurement is reduced, and the defects of hindering air flow, interfering with heating and increasing energy consumption of the existing active sensor temperature measurement are overcome.

Description

Technical Field

[0001] This invention relates to an induction heating device, an aerosol generation system, and a control method, belonging to the field of electromagnetic induction heating technology. More specifically, it relates to an aerosol generation device that achieves sensor detection and heating temperature control by measuring the voltage of the sensing winding. Background Technology

[0002] In recent years, heated non-combustible aerosol generation technology has been applied in the medical, daily chemical, and tobacco industries. Heated aerosol generating matrices include herbal materials such as licorice, mugwort, agarwood, mosquito coils, tea, mint, cedarwood, and tobacco, and can be in liquid or capsule form. In these aerosol-generating products, the aerosol generating matrix is ​​heated to 200-500℃ by a resistance heating element, generating aerosols without combustion. While directly inserting a resistance heating element into the aerosol generating matrix allows for convenient heating and temperature control, the aerosol can contaminate the heating device cavity, and the heating element is prone to breakage and difficult to clean, resulting in a poor user experience.

[0003] Electromagnetic induction-based heating technology is a non-contact, rapid heating method with broad application prospects in aerosol generation products. In these aerosol generation products, a sensor made of magnetic metal is embedded in the aerosol generation matrix. This type of magnetic metal has a Curie temperature of 200-500℃ and can generate significant eddy current and magnetic losses under the influence of an external alternating magnetic field, rapidly converting electrical energy into heat energy and raising the temperature, thereby heating the aerosol generation matrix and generating aerosols. Since the magnetic metal sensor is fully enclosed and embedded in the aerosol generation product for single use, it is necessary to develop an induction heating device capable of non-contact insertion / removal detection, heating temperature detection, and control of the sensor contained within the aerosol generation product. Reference CN110731125A indirectly and non-contactly detects the equivalent electrical parameters (apparent resistance, apparent impedance, apparent conductance, etc.) of the sensor by detecting changes in the DC current output by a DC power supply during induction heating, thereby determining the insertion / removal of the sensor relative to the actual temperature. The following problems exist when this scheme is applied in a high-frequency electromagnetic induction heating device: (1) Because the DC current is determined by the excitation current, while the high-frequency excitation current is determined by the impedance of the entire device under constant input voltage, including the apparent impedance of the sensor, the impedance of the excitation coil, and the parasitic parameter impedance of the components. The apparent impedance of the sensor and the impedance of the excitation coil can be accurately calibrated, but the parasitic parameter impedance of the components becomes more and more obvious with the increase of frequency. At high frequencies (hundreds of kHz to tens of MHz), it significantly interferes with the accuracy of current measurement (10.1109 / SPEC.2016.7846098.), thus ultimately affecting the accuracy of temperature measurement. (2) In the induction heating system, even a slight deviation in the position of the sensor will cause changes in the equivalent electrical parameters, resulting in problems such as incorrect identification of aerosol generated products, heating interruption, and temperature detection errors, which affect the actual application of the product. The slight deviation in the position of the sensor is common. It may be caused by dimensional errors in the sensor processing, tolerances in the production and assembly of aerosol-generated products, or accidental slippage of the aerosol-generated product during the suction process. (3) The above-mentioned existing technology can only identify and heat sensors with nickel-based alloy double / triple composite structures. If the sensor is a single-layer magnetic metal, it will cause problems of non-identification or identification errors.

[0004] Documents CN 117397887 A and CN 117461910 A disclose a scheme for indirectly measuring the temperature of the internal sensor of an aerosol product by setting an internal sensor and an end temperature-sensitive element in the aerosol product. The temperature of the sensor is conducted to the end temperature-sensitive element, causing a change in its physical properties. Then, an active sensor is used to measure the temperature of the end temperature-sensitive element non-contactly, thus indirectly realizing the temperature measurement of the internal sensor of the aerosol product. This scheme has the following shortcomings: (1) The end temperature is measured by detecting the magnetic field generated by the planar temperature-sensitive element at the end of the aerosol product. However, the magnetic field generated by the thin strip-shaped sensor arranged along the axis of the excitation winding inside the aerosol product is orthogonal to the active sensor and cannot be detected. Therefore, it is impossible to directly measure the temperature of the internal thin strip-shaped sensor. (2) Due to the heat transfer effect and temperature gradient, the temperature of the planar temperature-sensitive element at the end is very different from the temperature inside the aerosol product, resulting in inaccurate temperature measurement. (3) Setting an end planar temperature-sensitive element not only makes the production of aerosol products difficult, but also increases the airflow resistance when the user inhales, affecting the consumer experience. (4) When the sensor position shifts, the temperature rise of the end planar temperature-sensitive element is different, which causes the sensor position change and affects the accuracy of temperature measurement. (5) Existing active sensors, or their improved solutions (based on amorphous ferromagnetic wires), all require high-frequency AC power supply, and the power supply cannot be too low. Under the strong electromagnetic field interference of the heating coil, if the power supply of the active sensor is too low, the measurement will be less accurate, which increases the energy consumption of the device. At the same time, the alternating magnetic field generated by the high-frequency AC power supply of the active sensor will also interfere with the preset alternating magnetic field for induction heating of the sensor, affecting the normal heating of the sensor. In addition, in the improved solution based on amorphous ferromagnetic wires, the amorphous ferromagnetic wires must be as close as possible to the heat source, but under high temperature conditions for a long time, the amorphous ferromagnetic wires will crystallize and cause the temperature measurement function to be lost. (6) This type of solution can only perform temperature detection and cannot perform insertion and removal detection of aerosol products. Summary of the Invention

[0005] To address the shortcomings of the prior art, the present invention aims to provide a non-contact method for an induction heating device to perform insertion / removal detection, heating temperature detection, and control on aerosol-generated products containing a single-layer magnetic metal sensor, while remaining insensitive to sensor positional deviations.

[0006] This invention provides an induction heating device for heating an aerosol-generating product 9 containing a magnetic metal sensor 5, comprising an AC power module 1, an excitation winding 2, a detection winding 3, and a voltage measurement module 4.

[0007] The excitation winding 2 is used to inductively heat the magnetic metal sensor 5; the detection winding 3 is used to passively detect the insertion of the sol-generated product 9, the removal of the aerosol-generated product 9, and the change of the magnetic field lines 11 when the temperature of the magnetic metal sensor 5 changes.

[0008] After the aerosol generating product 9 is loaded into the induction heating device, the magnetic metal sensor 5 contained in the aerosol generating product 9 is located inside the space of the excitation winding 2.

[0009] The length direction of the magnetic metal sensor 5 is parallel to the axis 12 of both the excitation winding 2 and the detection winding 3.

[0010] The Curie temperature of the magnetic metal is greater than 200°C;

[0011] The AC power module 1 is connected to the excitation winding 2 and applies a high-frequency excitation current to the excitation winding 2;

[0012] The voltage measurement module 4 is connected to the detection winding 3 and measures the voltage across the two ends of the detection winding 3.

[0013] Preferably, the excitation winding 2 generates a magnetic field after being subjected to a high-frequency excitation current, which magnetizes the magnetic metal sensor 5 and generates induction heating.

[0014] When the aerosol generating product 9 containing the magnetic metal sensor 5 is inserted into or pulled out of the space surrounded by the excitation winding 2, a sudden change in the voltage across the winding 3 is detected.

[0015] After a high-frequency excitation current is applied to the excitation winding 2, the voltage across the detection winding 3 changes.

[0016] The induction heating device is configured to achieve one or more purposes, such as insertion of the aerosol-generating product 9, extraction of the aerosol-generating product 9, and non-contact measurement of the temperature of the magnetic metal sensor 5, by measuring the voltage across the two ends of the detection winding 3.

[0017] Preferably, the length direction of the magnetic metal sensor 5 is parallel to the axis 12 of both the excitation winding 2 and the detection winding 3; the excitation winding 2 and the detection winding 3 are configured to be coaxial; the turns ratio of the excitation winding 2 and the detection winding 3 is 5:1 to 1:100; the excitation winding 2 and the detection winding 3 are made of one of copper wire, silver-clad copper wire, silver wire, and aluminum wire; the cross-sectional area of ​​the conductor of the excitation winding 2 is larger than the cross-sectional area of ​​the conductor of the detection winding 3.

[0018] Preferably, the induction heating device further includes a control module 6 and a feedback circuit 8; the control module 6 processes the obtained voltage signal 7 of the detection winding 3 to determine one or more of the following: insertion of the aerosol generating product 9, extraction of the aerosol generating product 9, and temperature of the magnetic metal sensor 5; the control module 6 processes the obtained voltage signal 7 of the detection winding 3 and adjusts the parameters of the high-frequency excitation current applied to the excitation winding 2 by the AC power module 1 through the feedback circuit 8 to control the heating temperature of the magnetic metal sensor 5 in the aerosol generating product 9; the parameters of the excitation current include one or more of the following: current magnitude, current frequency, duty cycle, and phase.

[0019] Preferably, the induction heating device may further include a device housing, a cavity 10 for accommodating the aerosol-generated product, heat insulation material and shielding material surrounding the cavity, and a DC power supply.

[0020] The present invention also provides a control method for the aforementioned induction heating device, comprising the following steps: after the AC power module 1 applies current to the excitation winding 2, the temperature of the magnetic metal sensor 5 in the heated aerosol generating product is measured non-contactly by detecting the voltage value at both ends of the detection winding 3.

[0021] Preferably, the aerosol generating product 9 containing the magnetic metal sensor 5 is inserted into the induction heating device by detecting the voltage change across the detection winding 3; thereby turning on or off the AC power module 1 to apply current to the excitation winding 2.

[0022] If the voltage suddenly increases, it is determined that the aerosol generating product 9 containing the magnetic metal sensor 5 is inserted into the induction heating device; if the voltage suddenly decreases, it is determined that the aerosol generating product 9 containing the magnetic metal sensor 5 is pulled out of the induction heating device.

[0023] Preferably, the non-contact measurement of the temperature of the magnetic metal sensor 5 in the heated aerosol generating product 9 by detecting the voltage value across the detection winding 3 specifically includes the following steps:

[0024] Obtain the following parameters of the currently used magnetic metal sensor 5: T mon v mon T max v max ;

[0025] T mon This refers to the lowest initial temperature during the stage where the induction heating temperature monotonically increases with the voltage across the detection winding 3 when the current magnetic metal sensor 5 is induction heated by the induction heating device; v mon For T mon The corresponding voltage value across the probe winding 3;

[0026] T max This represents the highest temperature that the current magnetic metal sensor 5 can reach when inductively heated by the aforementioned induction heating device; v max For T max The corresponding voltage value across the probe winding 3;

[0027] Based on the voltage value v across the probe winding 3 obtained by detection real v is calculated as follows real The corresponding temperature T real As the measured temperature of the current magnetic metal sensor 5: T real equals, v real With v mon The difference, multiplied by T max With T mon The difference, then divided by v max With v mon The difference, plus T at the end. mon .

[0028] Preferably, the v max and T max The methods for obtaining it include the following steps:

[0029] The current applied to the excitation winding 2 is gradually increased using AC power module 1, while the voltage across the detection winding 3 and the temperature of the magnetic metal sensor 5 are continuously monitored. The maximum value of the voltage across the detection winding 3 is taken as v. max When the maximum voltage value across the detection winding 3 is measured, the temperature of the magnetic metal sensor 5 is taken as T. max .

[0030] The present invention also provides an aerosol generation system comprising the aforementioned induction heating device and an aerosol generation article 9; the aerosol generation article 9 includes an aerosol forming matrix 13 and one or more sensors 5 made of magnetic metal; the induction heating device is configured to heat the sensors 5 when the aerosol generation article 9 is inserted into the induction heating device.

[0031] Preferably, the aerosol generating matrix includes, but is not limited to, herbal aerosol generating matrices such as licorice, mugwort, agarwood, mosquito coils, tea, mint, cedar, and tobacco, and can be one or more of the following: filamentous, strip-shaped, flake-shaped, granular, powder-shaped, or paste-shaped. The aerosol generating matrix can also be liquid or capsule-shaped.

[0032] Preferably, the sensor 5 is made of a single layer of magnetic metal. Preferably, the ordered atomic range (i.e., grain size) of the single-layer magnetic metal is less than 2 nm, the Curie temperature is 200℃~500℃, and the coercivity is greater than 4 A / m. The preparation method of the single-layer magnetic metal is one or more of the following: rapid melt solidification, continuous melt casting, and rolling. The composition includes 70%~97% ferromagnetic elements, 1.6%~6.2% boron-carbon components, 0%~10.0% of a first auxiliary element, and 0%~18% of a second auxiliary element by weight. The boron-carbon components are any one or a combination of boron and carbon. The first auxiliary element is any one of silicon or phosphorus. One or two combinations thereof; the second auxiliary element is any one or more combinations of scandium, titanium, vanadium, chromium, manganese, copper, zinc, gallium, germanium, indium, tin, antimony, bismuth, lead, aluminum, magnesium, zirconium, niobium, molybdenum, hafnium, tantalum, tungsten, and rare earth elements; the ferromagnetic element is one or more of iron, cobalt, and nickel, preferably iron, and more preferably, the ferromagnetic element in the iron-based monolayer magnetic alloy material does not include nickel; preferably, the monolayer magnetic metal is an iron-based monolayer magnetic alloy sheet with magnetostrictive effect, and more preferably, the iron-based monolayer magnetic alloy sheet is provided with one or more defects among holes, indentations, scratches, pits, protrusions, cracks, creases, notches, and stress.

[0033] The aerosol generating article 9 containing a magnetic metal sensor may contain one sensor or multiple sensors, preferably 2 to 10 sensors.

[0034] According to one or more embodiments, the control method of the induction heating device determines that the aerosol generating article 9 containing the magnetic metal sensor 5 has been inserted into the induction heating device by detecting a sudden increase in the voltage across the detection winding 3. Preferably, the AC power module 1 is further turned on to apply current to the excitation winding 2. Determining that the aerosol generating article 9 containing the magnetic metal sensor 3 has been removed from the induction heating device by detecting a sudden decrease in the voltage across the detection winding 3, preferably, the AC power module 1 is further interrupted from applying current to the excitation winding 2.

[0035] After the AC power module 1 applies current to the excitation winding 2, it detects the voltage across the sensing winding 3 to achieve non-contact temperature measurement of the magnetic metal sensor 5 in the heated aerosol-generating product. The initial value v of the voltage across the sensing winding 3 is then detected by the AC power module 1 after applying current to the excitation winding 2. ini And increase the voltage across probe winding 3 to v mon The temperature corresponding to this time is determined to be the monotonic initial temperature T. mon ;Detect the maximum voltage value v across the probe winding 3 max To obtain the highest temperature T of the magnetic metal sensor 5 in the heated aerosol generating product 9.max The aforementioned v mon Greater than v ini and not greater than v max The voltage across winding 3 is at V. mon and v max Between these times, the temperature of the magnetic metal sensor 5 in the aerosol-generating product 9 is at T. mon and T max The voltage increases monotonically between the two windings, and the actual temperature of the magnetic metal sensor 5 corresponds one-to-one with the voltage value across the detection winding 3. The temperature of the magnetic metal sensor 5 is regulated by adjusting the voltage value 7 across the detection winding 3 through the feedback circuit 8 and the control module 6.

[0036] In the induction heating device of the present invention, the excitation winding 2, the detection winding 3, and the sensor 5 are coupled together by magnetic lines of force 11. When the induction heating device is operating, the magnetic lines of force 11 include those generated by the excitation winding and those generated by the sensor; these two lines are superimposed in the same direction and are substantially parallel to the axis 12 of the excitation winding 2. During induction heating, the magnetic lines of force generated by the sensor 5, made of magnetic metal, increase with increasing temperature, reaching their maximum value near the Curie temperature of the magnetic metal, and then momentarily decreasing to their minimum value above the Curie temperature. Although the induction heating device itself does not apply current or voltage to the detection winding 3, the change in the number of magnetic lines of force generated by the sensor will cause a change in the induced voltage in the detection winding 3 through electromagnetic induction. Since all the magnetic lines of force generated by the sensor 5 enter the detection winding 3 when the sensor 5 is placed within the cavity formed by the excitation winding 2, the voltage within the detection winding 3 is insensitive to the positional deviation of the sensor 5. Based on this, the induction heating device and its control method proposed in this invention can perform insertion / removal detection, heating temperature detection and control of aerosol-generated products containing a sensor made of a single layer of magnetic metal in a non-contact manner, and are not sensitive to the positional deviation of the sensor.

[0037] The beneficial effects of this invention are:

[0038] 1. This invention detects changes in the magnetic field lines of the sensor at different temperatures by using a detection winding, and converts these changes into voltage changes to achieve temperature detection. The detection signal (magnetic field lines) originates directly from the sensor itself, avoiding interference from parasitic parameters of components at high frequencies on measurement accuracy. The magnetic field lines of the magnetic metal sensor are completely surrounded within the detection winding, reducing the impact of changes in the position of the magnetic metal sensor on the measurement, and enabling direct measurement of the temperature of the sensor inside aerosol products.

[0039] 2. By using a passive winding design, the shortcomings of existing active temperature sensors, such as hindering airflow, interfering with heating, and increasing energy consumption, are overcome.

[0040] 3. The aerosol-generated product is inserted into the induction heating device based on the voltage change across the detection winding. The detection is sensitive and has strong anti-interference ability.

[0041] 4. Through experimental comparison, it was found that the aerosol generation system and control method provided by the present invention are not sensitive to changes in the position of the magnetic metal sensor, and are suitable for insertion and removal identification and temperature measurement of single-layer magnetic metal sensors. Heating is based on insertion and removal identification, which improves the intelligence level of the heating system. Attached Figure Description

[0042] The features described in one aspect or implementation may also be applicable to other aspects and implementations. Specific implementations will now be described in conjunction with the accompanying drawings and embodiments, which are provided merely as examples to further illustrate the invention.

[0043] In the attached diagram:

[0044] Figure 1 This is a system configuration diagram of the induction heating device described in this invention;

[0045] Figure 2 This is a partial structural diagram of the aerosol generation system comprising an induction heating device and an aerosol generation product according to the present invention.

[0046] Figure 3 This is a partial structural diagram of the aerosol generation system comprising an induction heating device and an aerosol generation product according to the present invention.

[0047] Figure 4 This is the correspondence between the detection winding voltage and the sensor temperature in this invention;

[0048] Figure 5 This is a cross-sectional view of the aerosol-generating article containing a metal sensor according to the present invention;

[0049] Figure 6 This is a side view of the aerosol-generating article containing a metal receptor as described in this invention;

[0050] Figure 7 The sensor, made of a single layer of magnetic metal, has a temperature of T. mon At that time, the corresponding measured voltage diagram of the detection winding;

[0051] Figure 8 The sensor, made of a single layer of magnetic metal, has a temperature of T. max At that time, the corresponding measured voltage diagram of the detection winding;

[0052] Figure 9 The sensor, made of commercially available three-layer metal, has a temperature of T. mon At that time, the corresponding measured voltage diagram of the detection winding;

[0053] Figure 10 The sensor, made of commercially available three-layer metal, has a temperature of T. max At that time, the corresponding measured voltage diagram of the detection winding;

[0054] Figure 11 This is the complete operating curve of the aerosol generation system described in this invention.

[0055] The attached figures are labeled as follows: 1. AC power module; 2. Excitation winding; 3. Detection winding; 4. Voltage measurement module; 5. Sensor; 6. Control module; 7. Voltage signal; 8. Feedback control; 9. Aerosol product containing sensor; 10. Cavity; 11. Magnetic lines of force; 12. Axis; 13. Aerosol generation matrix. Detailed Implementation

[0056] To make the above-mentioned objectives, technical solutions, and advantages of the present invention clearer and more easily understood, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Those skilled in the art can make various modifications or additions to the following specific embodiments or use similar methods to replace them, as long as they do not depart from the concept or example of the present invention, or do not exceed the scope defined by the claims, all of which should fall within the protection scope of the present invention.

[0057] Figure 1 This is a system configuration diagram of the induction heating device described in this invention. The induction heating device is used to heat an aerosol-generating product 9 containing a magnetic metal sensor 5, and includes an AC power supply module 1, an excitation winding 2, a detection winding 3, a voltage measurement module 4, and a control module 6; the Curie temperature of the magnetic metal is greater than 200°C; the AC power supply module 1 is connected to the excitation winding 2 and applies a high-frequency excitation current to the excitation winding 2; the voltage measurement module 4 is connected to the detection winding 3 and measures the voltage across the detection winding 3.

[0058] The AC power module 1 may include a battery providing DC power and a DC / AC converter converting the DC power to AC power. The battery supply voltage is 0.5V~5V, providing DC power of 0.5A~10A. The DC / AC converter provides AC power at a frequency of 0.5MHz~30MHz. The AC power module 1 may also include a load matching network to reduce system reactive power and improve power transmission efficiency.

[0059] The excitation winding 2 is cylindrical, with a diameter of 3mm to 10mm, and surrounds the surface of the cavity 10 that contains the aerosol-generated product. Figure 2 , Figure 3 (As shown). The conductor cross-section of the winding is circular or rectangular, with a diameter or thickness of 0.1mm to 1.5mm, 3 to 20 turns, and a winding height of 5mm to 50mm.

[0060] The detection winding 3 is cylindrical with a diameter of 2mm to 10mm. It can be wrapped around the surface of the cavity 10 containing the aerosol-generated product, or it can be placed at the bottom of the cavity 10. Figure 2 , Figure 3 (As shown). The conductor cross-section of the winding is circular or rectangular, with a diameter or thickness of 0.05mm to 1mm, and the winding height is 0.2mm to 50mm. The turns ratio of the excitation winding 2 and the detection winding 3 is 5:1 to 1:100.

[0061] Voltage measurement module 4 is an AC voltage measurement module used to detect the voltage of the probe winding. The voltage measurement module includes circuits, active and passive components, sensors, samplers, A / D converters, amplifiers, filters, etc., used to achieve voltage measurement. The voltage measurement module may also include one or more of the following: voltage transformers, Hall effect voltage sensors, and fiber optic voltage sensors. The voltage measurement module can also be other types of circuits, components, chips, sensors, or combinations thereof capable of voltage measurement.

[0062] The control module 6 is used to control the overall operation of the induction heating device, for example, controlling the operation of the AC power module, sensor, excitation winding, detection winding, voltage measurement module, and other components. Additionally, the control module can determine whether the device is in an operable state by checking the status of corresponding components of the induction heating device. The control module 6 may include at least one processor. The processor may be implemented as an array of multiple logic gates, or it may be implemented as a combination of a general-purpose microprocessor and a memory storing a program executable in the microprocessor. Furthermore, those skilled in the art will understand that the processor may also include other types of hardware.

[0063] The voltage measurement module 4 detects voltage changes in the sensing winding 3 and transmits this information to the control module 6. The control module 6 can determine, based on the input value 7 of the voltage measurement module 4, whether the aerosol generating article 9 containing the magnetic metal sensor 5 is inserted into or removed from the cavity enclosed by the excitation winding 3.

[0064] When the insertion of the aerosol-generating article 9 containing the magnetic metal sensor 5 is detected, the control module 6 can automatically perform a heating operation without additional external input. For example, the control AC power module 1 supplies power to the excitation winding 2. When the excitation winding 2 generates magnetic lines of force 11 and cuts the magnetic metal sensor 5, the sensor 5 can be heated. The power supplied to the excitation winding 2 can be adjusted under the control of the control module 6 to maintain the temperature of the sensor 5 at an appropriate value. Therefore, the aerosol-generating article 9 containing the sensor 5 can be heated and can generate aerosol.

[0065] The control module 6 can control the power supplied from the AC power module 1 to the excitation winding 2 using pulse width modulation (PWM). The control module 6 may include a memory that stores various data processed by the induction heating device and some predefined parameters. The memory can be random access memory (RAM), dynamic random access memory (DRAM), static random access memory (SRAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), or other devices with storage functions. The memory can store reference values ​​(or thresholds) for detecting voltage changes in the sensing winding 3 to determine the insertion or removal of the aerosol-generating article 9, and can also store the operating time of the induction heating device, the maximum number of pumping cycles, the current number of pumping cycles, at least one temperature profile, and various data regarding the user's smoking pattern.

[0066] In addition, the induction heating device may also include other general components, such as other sensors (e.g., gravity sensors, acceleration sensors, temperature sensors, suction sensors, etc.), user interface, charging circuit, etc.

[0067] The user interface can provide users with information about the status of the induction heating device and may include input / output interface units such as displays or lights, motion or vibration motors, speakers, buttons, touch screens, and fingerprint sensors. The user interface may include various interface units, such as terminals for data communication or receiving charging power, and interface modules for wireless communication with external devices (e.g., Wi-Fi, Bluetooth, near-field communication, etc.).

[0068] The sensor 5 can be made of a single-layer metallic magnetic material with a Curie temperature greater than 200°C, such as a magnetic alloy containing one or more of the three elements iron, cobalt, and nickel with a total mass fraction greater than 50%. Specifically, it can be, but is not limited to, at least one of ferritic stainless steel, iron-nickel alloy, iron, nickel, cobalt, iron-silicon alloy, iron-silicon-aluminum alloy, iron-silicon-chromium alloy, iron-based amorphous material, iron-based nanocrystalline material, etc.

[0069] The sensor prepared from the monolayer magnetic metal has an atomic order range (grain size) of less than 2 nm, a Curie temperature of 200℃~500℃, and a coercivity greater than 4 A / m. The monolayer magnetic metal is prepared by one or more of the following methods: rapid melt solidification, continuous melt casting, and rolling. Its composition includes 70%~97% ferromagnetic elements, 1.6%~6.2% boron-carbon components, 0%~10.0% of a first auxiliary element, and 0%~18% of a second auxiliary element by weight. The boron-carbon components are any one or a combination of boron and carbon. The first auxiliary element is any one or a combination of silicon or phosphorus. The second auxiliary element is any one or more combinations of scandium, titanium, vanadium, chromium, manganese, copper, zinc, gallium, germanium, indium, tin, antimony, bismuth, lead, aluminum, magnesium, zirconium, niobium, molybdenum, hafnium, tantalum, tungsten, and rare earth elements; the ferromagnetic element is one or more of iron, cobalt, and nickel, preferably iron, and more preferably, the ferromagnetic element in the iron-based monolayer magnetic alloy material does not include nickel; preferably, the monolayer magnetic metal is an iron-based monolayer magnetic alloy sheet with magnetostrictive effect, and more preferably, the iron-based monolayer magnetic alloy sheet is provided with one or more defects of holes, indentations, scratches, pits, protrusions, cracks, creases, notches, and stress.

[0070] Receptors can be elongated, sheet-like, powdery, irregularly shaped, etc., and can be single or multiple. Figure 5 , Figure 6 ).

[0071] The following example, using a sensor made of a single-layer magnetic metal as described in this invention, illustrates the control method of the induction heating device in this invention:

[0072] The induction heating device control module 6 can be configured to control the AC power supply module 1 to intermittently apply a weak AC current to the excitation winding 2. At this time, the magnetic field lines generated by the excitation winding 2 are weak, resulting in a voltage v0 in the sensing winding 3. When the aerosol generating article 9 containing the sensor 5 is inserted into... Figure 2 When the sensor 5 is in the cavity shown, it generates additional magnetic field lines, causing the voltage of the probe winding 3 to change from v0 to v. ini (Under normal circumstances v) ini (v0≥1.05). At this time, the control module 6 determines that the aerosol-generating product 9 has been inserted and controls the AC power module 1 to apply enhanced AC current to the excitation winding 2, causing the sensor 5 to heat up rapidly. The heating process is as follows: Figure 4 As shown, when the temperature of sensor 5 rises to point A, the voltage of the sensing winding 3 increases monotonically with the temperature of sensor 5. At this time, the temperature of sensor 5 is T. mon At that time, the voltage of the detection winding 3 was v. mon When the temperature of sensor 5 continues to rise to point B, the temperature reaches T. maxAt that time, the voltage of probe winding 3 increased to v max Receptor 5 continues to heat up to the Curie temperature T. c At that time, the voltage of probe winding 3 suddenly dropped to v. min (v) min Slightly greater than v0).

[0073] For specific receptor materials, T mon v mon T max v max v mon With v ini The ratios k and v max With v mon The ratio h and the AB curve between them can be calibrated and stored in the induction heating device control module before leaving the factory. In actual operation, the voltage of the sensing winding 3 can be converted to kV. ini The value is set to v when k is greater than 1, preferably greater than 1.1. mon The voltage of the probe winding 3 is changed to hv ini The value is set to v when h is greater than 1 and h is greater than k. max And at this time v mon and v max Respectively with the stored T mon and T max This one-to-one correspondence method can reduce the adverse effects of processing errors in sensor 5. When using an induction heating device to heat aerosol-generated products, the control module 6 can determine the heating temperature of sensor 5 in real time based on the voltage of the detection winding 3 and perform fine-tuned temperature control. In some approximate cases, the AB curve can be approximated as a straight line, in which case the actual temperature T of the sensor... real The actual voltage v of the sensing winding 3 can be determined by... real Calculate using the following formula:

[0074]

[0075] In some embodiments, T mon T max The properties of the material, which depend on the receptor, are known and can be stored in the control module. For example, for a magnetic metal with a Curie temperature of 350°C, its T... max Approximately 340℃, T mon Approximately 300℃. And v mon v max The AB curve between the two parameters can be obtained by performing one or more calibration procedures on the sensor. The specific calibration procedure is as follows: After the induction heating device is started, the temperature of sensor 5 begins to rise, but the temperature remains below T. monAt that time, the voltage of the sensing winding 3 remained at a low value and the fluctuation was not significant. Figure 7 The value shown is approximately 11.08 mV, and this value can be set to v. mon When the temperature rises to T max At that time, the voltage of probe winding 3 rapidly increased to its maximum value ( Figure 8 The value shown is approximately 22.74 mV, and this value can be set to v. max Throughout the AB curve segment, the voltage increase of the detection winding 3 exceeds 100% (voltage increase = 22.74 / 11.08 - 1). When the voltage of the detection winding 3 returns to v0, the control module 6 can determine that the aerosol-generating product 9 has been removed. It should be noted that the specific measured value of the voltage of the detection winding 3 is related to the excitation winding 3, the number of turns of the detection winding 3, and also to the voltage measurement module 4, but this does not affect the control method in this invention and all fall within the scope of this invention.

[0076] As a comparative example, a nickel alloy triple-layer metal sensor (CN110461177B, currently the only commercially available sensor) manufactured by Philip Morris was applied to the induction heating device in the above embodiments. After the induction heating device was started, the sensor temperature began to rise, but remained below T. mon At that time, the voltage of the sensing winding 3 remained at a low value and the fluctuation was not significant. Figure 9 The value shown is approximately 70mV, and this value can be set to v. mon When the temperature rises to T max At that time, the voltage of probe winding 3 rapidly increased to its maximum value ( Figure 10 The value shown is approximately 80mV, and this value can be set to v. max Throughout the entire AB curve segment, the voltage increase of probe winding 3 exceeded 14% (voltage increase = 80 / 70 - 1).

[0077] The above comparison reveals that for the single-layer metal sensor described in this invention, the induction heating device and control method described in this invention can achieve a sufficiently large voltage increase in the detection winding 3 in segment AB, which provides adequate temperature measurement and control accuracy. However, the commercially available three-layer metal sensor achieves a very small voltage increase in the detection winding in segment AB; if the induction heating device and control method described in this invention are used, its temperature measurement and control accuracy will be reduced.

[0078] The aerosol generation system based on the above-mentioned induction heating device and control method includes the following working steps ( Figure 11 ):

[0079] S1: When the aerosol-generating product 9 is inserted into the cavity 10 of the induction heating device, the power supply of the detection winding generates a pulse signal a, which triggers the induction heating device to apply a weak alternating current to the excitation winding 2. If the above pulse signal is not caused by the insertion of the aerosol-generating product, but by other interference factors (such as the accidental proximity of a ferromagnetic material), the magnetic field lines generated by the excitation winding 2 are weak, resulting in a voltage v0 in the detection winding 3. If the aerosol-generating product is indeed inserted into the cavity 10 of the induction heating device, the voltage of the detection winding 3 will rise to v0. ini (Under normal circumstances v) ini (v0≥1.05). Control module 6 determines that the aerosol-generated product has been inserted into the induction heating device at this time.

[0080] S2: Control module 6 controls AC power module 1 to apply enhanced AC current to excitation winding 2, causing sensor 5 to heat up rapidly and increasing the voltage of sensing winding 3. When the voltage of sensing winding 3 increases to v... mon At that time, the temperature of sensor 5 was T. mon When the voltage of probe winding 3 increases to v max At that time, the temperature of receptor 5 continued to rise to its maximum value at T. max At this point, reducing or turning off the AC output causes the sensor temperature to drop. Then, the AC output is increased again, causing the voltage of the sensing winding 3 to rise to V once more. max The temperature of sensor 5 rises again to its maximum value of T. max Because this process can heat to the highest temperature and achieve maximum heat output, it can be repeated once or multiple times and can be used for measuring v. mon v max The AB curve between them can be used for calibration, and it can also be used to preheat aerosol-generating products so that they can quickly reach the target temperature and generate aerosols, which the user can then begin to draw in.

[0081] S3: The optimal heating temperature T for a specific aerosol-generating matrix. real It is known that the optimal heating temperature T can be calculated using the aforementioned formula. real The corresponding voltage v of the detection winding 3 real The user's suction action introduces cold air, causing the temperature of sensor 5 to drop periodically, which in turn causes the voltage across the sensing winding 3 to drop periodically. Control module 6, through feedback circuit 8, maintains the voltage across sensing winding 3 at a constant V. real Within a reasonable range, thus ensuring that the temperature of the receptor is maintained at T. real Nearby. Each time the user performs a suction, control module 6 increments the suction count.

[0082] S4: After reaching the rated number of suction cycles for the aerosol generation matrix, control module 6 controls AC power module 1 to interrupt current output, the temperature of sensor 5 decreases, and the voltage of detection winding 3 continues to drop to V. ini And remain unchanged. When the user pulls out the aerosol-generated product, the voltage of the detection winding 3 drops sharply by b, and the control module 6 determines that the suction action has ended.

[0083] Those skilled in the art related to this embodiment will understand that various changes in form and detail can be made therein without departing from the scope of the above features. Therefore, the disclosed method should be considered descriptive rather than restrictive. The scope of this disclosure is defined by the appended claims rather than the foregoing description, and all differences within the scope of their equivalents should be interpreted as included in this disclosure.

Claims

1. An induction heating device for heating an aerosol-generating article comprising a magnetic metal susceptor (5), characterized in that, The induction heating device comprises an alternating current power module (1), an excitation winding (2), a detection winding (3), and a voltage measurement module (4). The excitation winding (2) is used to induce heating of the magnetic metal susceptor (5); the detection winding (3) is used to passively detect changes in the magnetic field lines (11) when the aerosol generating article (9) is inserted, the aerosol generating article (9) is removed, and the temperature of the magnetic metal susceptor (5) changes. After the aerosol generating article (9) is loaded into the induction heating device, the magnetic metal susceptor (5) contained in the aerosol generating article is located inside the space of the excitation winding (2). The length direction of the magnetic metal susceptor (5) is parallel to the axis (12) of the excitation winding (2) and the detection winding (3). The Curie temperature of the magnetic metal is greater than 200℃. The alternating current power module (1) is connected to the excitation winding (2) and applies a high-frequency excitation current to the excitation winding (2). The voltage measurement module (4) is connected to the detection winding (3) and measures the voltage across the detection winding (3).

2. The induction heating device of claim 1, wherein The excitation winding (2) generates a magnetic field after being applied with a high-frequency excitation current, causing the magnetic metal susceptor (5) to be magnetized and generate induction heating; After the aerosol generating article (9) containing the magnetic metal susceptor (5) is inserted or removed from the space surrounded by the excitation winding (2), the voltage across the detection winding (3) changes; After the excitation winding (2) is applied with a high-frequency excitation current, the voltage across the detection winding (3) changes; The induction heating device is configured to achieve one or more of the following purposes by measuring the voltage across the detection winding (3): insertion of the aerosol generating article (9), removal of the aerosol generating article (9), and non-contact measurement of the temperature of the magnetic metal susceptor (5).

3. The induction heating device of claim 1, wherein The excitation winding (2) and the detection winding (3) are configured to be coaxial; The turns ratio of the excitation winding (2) and the detection winding (3) is 5:1 to 1:

100.

4. The induction heating device of claim 1, further comprising a control module (6) and a feedback circuit (8). The control module is used to determine one or more of the following: insertion of the aerosol generating article (9), removal of the aerosol generating article (9), and temperature of the magnetic metal susceptor (5) by processing the obtained voltage signal (7) of the detection winding (3); The control module (6) adjusts the parameters of the high-frequency excitation current applied to the excitation winding (2) by the alternating current power module (1) through the feedback circuit (8), to control the heating temperature of the magnetic metal susceptor (5) in the aerosol generating article (9); The parameters of the excitation current include one or more of the following: current size, current frequency, duty cycle, and phase. The method comprises the following steps:

5. The control method of the induction heating apparatus according to any one of claims 1 to 4, characterized in that, ​ After the AC power module (1) applies current to the field winding (2), the temperature of the magnetic metal susceptor (5) in the heated aerosol generating article (9) is non-contact measured by detecting the voltage value across the detection winding (3).

6. The control method of the induction heating apparatus according to claim 5, characterized by, Further comprising the following steps: By detecting the voltage mutation across the detection winding (3), it is determined whether the aerosol generating article (9) containing the magnetic metal susceptor (5) is inserted into the induction heating device; and the AC power module (1) applies current to the field winding (2) is started or interrupted.

7. The control method of the induction heating apparatus according to claim 5, characterized by, The non-contact measurement of the temperature of the magnetic metal susceptor (5) in the heated aerosol generating article (9) by detecting the voltage value across the detection winding (3) specifically includes the following steps: The following parameters of the currently used magnetic metal sensor (5) are acquired: T mon , v mon , T max , v max ; T mon the lowest starting temperature at the stage where the inductive heating temperature monotonously increases with the voltage value across the detection winding (3) when the current magnetic metal susceptor (5) is inductively heated by the induction heating device; v mon the lowest starting temperature at the stage where the inductive heating temperature monotonously increases with the voltage value across the detection winding (3) when the current magnetic metal susceptor (5) is inductively heated by the induction heating device; T mon the voltage value across the corresponding detection winding (3). T max the maximum temperature that the current magnetic metal susceptor (5) can reach when subjected to induction heating by the induction heating device; v max the maximum temperature that the current magnetic metal susceptor (5) can reach when subjected to induction heating by the induction heating device; T max the voltage value across the corresponding detection winding (3). based on the detected voltage values across the probe winding (3) v real are calculated as follows v real the corresponding temperature T real as a measure of the current temperature of the magnetic metal sensor (5): T real is equal to v real the difference between v mon multiplied by T max the difference between T mon divided by v max the difference between v mon and finally added to T mon .

8. The control method of the induction heating device according to claim 7, wherein, The v max And T max The acquisition mode includes the steps of: The AC power module (1) is used to gradually increase the current applied to the field winding (2), and the voltage value across the detection winding (3) and the temperature of the magnetic metal sensor (5) are continuously detected. The maximum value of the detected voltage value across the detection winding (3) is taken as v max The maximum value of the voltage value across the detection winding (3) is measured, and the temperature of the magnetic metal sensor (5) is taken as T max .

9. The control method of the induction heating apparatus according to claim 7, characterized by, After the AC power module (1) applies current to the excitation winding (2), the voltage value across the detection winding (3) is... v mon and v max Between, the temperature of the magnetic metal sensor (5) in the aerosol-generating product (9) is at T mon and T max The temperature of the magnetic metal sensor (5) increases monotonically and corresponds one-to-one with the voltage value at both ends of the detection winding (3). The AC power module (1) is adjusted to apply current to the excitation winding (2) through the feedback circuit (8) and the control module (6) to achieve the regulation of the temperature of the magnetic metal sensor (5). The temperature of the magnetic metal sensor (5) is monitored in real time through the voltage value at both ends of the detection winding (3).

10. An aerosol-generating system comprising, The induction heating device and the aerosol generating article according to any one of claims 1 to 4; The aerosol generating article (9) includes an aerosol-forming substrate (13) and at least one susceptor (5) made of a magnetic metal; The induction heating device is configured to heat the susceptor when the aerosol generating article is inserted into the induction heating device.

11. An aerosol-generating system according to claim 10, wherein, The susceptor is made of a single-layer magnetic metal; The single-layer magnetic metal has an atomic order range less than 2 nm, a Curie temperature of 200°C to 500°C, and a coercivity greater than 4 A / m; The single-layer magnetic metal composition contains 70% to 97% by weight of a ferromagnetic element, 1.6% to 6.2% of a borocarbon component, 0% to 10.0% of a first auxiliary element, and 0% to 18% of a second auxiliary element; The borocarbon component is any one or a combination of boron and carbon; The first auxiliary element is any one or a combination of silicon and phosphorus; The second auxiliary element is any one or a combination of scandium, titanium, vanadium, chromium, manganese, copper, zinc, gallium, germanium, indium, tin, antimony, bismuth, lead, aluminum, magnesium, zirconium, niobium, molybdenum, hafnium, tantalum, tungsten, and rare earth elements; The ferromagnetic element is one or more of iron, cobalt, and nickel.

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