Induction heating device, aerosol generating system and control method

Abstract

The invention provides an induction heating device, an aerosol generation system and a control method, and the device is used for heating an aerosol generation product comprising a magnetic metal receptor, and comprises an AC power supply module, an excitation winding, a detection winding and a voltage measurement module. After the aerosol generating product is loaded to the induction heating device, the magnetic metal receptor contained in the aerosol generating product is located in the space of the excitation winding; the length direction of the magnetic metal receptor is parallel to the axes of the excitation winding and the detection winding; the Curie temperature of the magnetic metal is higher 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 position change of the magnetic metal receptor on measurement is reduced, and the defects of airflow obstruction, heating interference and energy consumption increase in temperature measurement of an existing active sensor are overcome.

Description

TECHNICAL FIELD

[0001] The present application relates to an induction heating device, an aerosol generating system and a control method, belonging to the technical field of electromagnetic induction heating. More particularly, it relates to an aerosol generating device for detecting and controlling the heating temperature of a susceptor by measuring the detection winding voltage. BACKGROUND

[0002] In recent years, heat-not-burn aerosol generating technology has been applied in medical, daily chemical, tobacco and other fields. The heatable aerosol generating substrate includes licorice, mugwort, eaglewood, mosquito repellent incense, tea, mint, cedar, tobacco and other herbal materials, which can also be liquid or capsule-shaped. In such aerosol generating products, the aerosol generating substrate is heated to 200-500℃ by a resistance heating sheet to generate aerosol without burning. Although direct use of a resistance heating sheet inserted into the aerosol generating substrate can facilitate heating and temperature control, the aerosol will contaminate the heating device cavity, and the heating sheet is prone to breakage, difficult to clean, and the user experience is poor.

[0003] The heating technology based on electromagnetic induction is a non-contact rapid heating, which has a wide application prospect in aerosol generating articles. In such aerosol generating articles, an susceptor made of magnetic metal with a Curie temperature of 200-500°C is embedded in the aerosol generating substrate. Under the action of external alternating magnetic field, the susceptor can generate a large amount of eddy current loss and magnetic loss, so that the electrical energy is quickly converted into heat energy and the temperature is raised, thereby heating the aerosol generating substrate and generating aerosol. Since the magnetic metal susceptor is fully enclosed and embedded in the aerosol generating article and is disposable, it is necessary to develop an induction heating device that can non-contact detect the insertion / removal of the susceptor contained in the aerosol generating article, detect and control the heating temperature. Document CN110731125A indirectly and non-contact detects the equivalent electrical parameters (apparent resistance, apparent impedance, apparent conductance, etc.) of the susceptor by detecting the change of the DC current output by the DC power supply during induction heating, so as to judge the insertion / removal and actual temperature of the susceptor. The scheme has the following problems when applied in a high-frequency electromagnetic induction heating device: (1) Because the DC current is determined by the excitation current, and the high-frequency excitation current is determined by the impedance of the entire device under the condition of constant input voltage, including the apparent impedance of the susceptor, the impedance of the excitation coil, and the parasitic parameter impedance of the components, among which the apparent impedance of the susceptor 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, which significantly interferes with the accuracy of current measurement (10.1109 / SPEC.2016.7846098.) at high frequency (several hundred kHz to several tens of MHz), thereby ultimately affecting the measurement accuracy of the temperature. (2) In the induction heating system, a slight deviation of the susceptor position will cause a change in the equivalent electrical parameters, thereby causing problems such as product application problems of aerosol generating article recognition error, heating interruption, temperature detection error. The slight deviation of the susceptor position is universal, which can be caused by size error in the processing of the susceptor, or caused by tolerance in the production and assembly process of the aerosol generating article, or caused by accidental sliding of the aerosol generating article during the user's smoking process. (3) The above prior art can only recognize and heat the susceptor with a nickel-based alloy double-layer / three-layer composite structure. If the susceptor is a single-layer magnetic metal, it will cause the problems of non-recognition or recognition error.

[0004] Documents CN 117397887 A and CN 117461910 A disclose a scheme of indirectly measuring the temperature of the internal susceptor of an aerosol generating article by providing an internal susceptor and an end temperature-sensitive element in the aerosol generating article, the temperature of the susceptor is thermally conducted to the end temperature-sensitive element to cause a physical property change of the end temperature-sensitive element, and then an active sensor is used to non-contact measure the temperature of the end temperature-sensitive element. This kind of scheme has the following disadvantages: (1) The temperature of the end is measured by detecting the magnetic field generated by the end planar temperature-sensitive element of the aerosol generating article, but the magnetic field generated by the internal thin strip-shaped susceptor of the aerosol generating article along the axis of the excitation winding is orthogonal to the active sensor and cannot be detected, so the direct temperature measurement of the internal thin strip-shaped susceptor cannot be realized. (2) The temperature of the end planar temperature-sensitive element is very different from the temperature inside the aerosol generating article due to heat transfer effect and temperature gradient, resulting in inaccurate temperature measurement. (3) The setting of the end planar temperature-sensitive element not only causes difficulty in the production of the aerosol generating article, but also increases the airflow resistance when the user smokes, affecting the consumer experience. (4) When the susceptor position deviates, the end planar temperature-sensitive element has different temperature rises, resulting in that the position change of the susceptor affects the accuracy of temperature measurement. (5) The existing active sensor or its improved scheme (based on amorphous ferromagnetic wire) itself needs to provide high-frequency alternating current power supply, and the power supply cannot be too low, because under the strong electromagnetic field interference of the heating coil, the active sensor with too low power supply is more inaccurate, which increases the energy consumption of the device; at the same time, the alternating magnetic field generated by the high-frequency alternating current power supply of the active sensor will interfere with the preset alternating magnetic field for inductive heating of the susceptor, affecting the normal heating of the susceptor; in addition, in the improved scheme based on amorphous ferromagnetic wire, the amorphous ferromagnetic wire must be as close as possible to the heat source, but the amorphous ferromagnetic wire will crystallize under long-term high-temperature working conditions and cause the temperature measurement function to lose. (6) This kind of scheme can only detect the temperature, and cannot detect the insertion and extraction of the aerosol generating article. SUMMARY

[0005] The present application aims to solve the above problems of the prior art. The purpose of the present application is to provide a method for non-contact detection of the insertion / extraction of an aerosol generating article containing a single-layer magnetic metal susceptor, and for non-contact detection of the heating temperature of the aerosol generating article containing a single-layer magnetic metal susceptor, and for non-sensitivity to the position deviation of the susceptor.

[0006] The present application provides an inductive heating device for heating an aerosol generating article 9 containing a magnetic metal susceptor 5, comprising an alternating current power supply 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 susceptor 5; the detection winding 3 is used to passively detect the changes in magnetic field lines 11 when the sol-gel generating article 9 is inserted, the sol-gel generating article 9 is pulled out and the temperature of the magnetic metal susceptor 5 changes;

[0008] After the sol-gel generating article 9 is loaded into the inductive heating device, the magnetic metal susceptor 5 contained in the sol-gel generating article 9 is located inside the space of the excitation winding 2;

[0009] 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;

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

[0011] 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;

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

[0013] Preferably, the excitation winding 2 generates a magnetic field after being applied with a high-frequency excitation current, which magnetizes the magnetic metal susceptor 5 and generates inductive heating;

[0014] After the sol-gel generating article 9 containing the magnetic metal susceptor 5 is inserted or pulled out of the space surrounded by the excitation winding 2, the voltage across the detection winding 3 changes abruptly;

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

[0016] The inductive heating device is configured to achieve one or several purposes of non-contact measurement of insertion of the sol-gel generating article 9, pulling out of the sol-gel generating article 9 and temperature of the magnetic metal susceptor 5 by measuring the voltage across the detection winding 3.

[0017] Preferably, 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 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 5:1~1:100; the excitation winding 2 and the detection winding 3 are made of one of copper wire, silver-coated copper wire, silver wire and aluminum wire; the cross-sectional area of the wire of the excitation winding 2 is greater than that of the detection winding 3.

[0018] Preferably, the induction heating device further comprises a control module 6 and a feedback circuit 8; the control module 6 determines one or more of the insertion of the aerosol generating article 9, the extraction of the aerosol generating article 9, and the temperature of the magnetic metal susceptor 5 by processing the obtained voltage signal 7 of the detection winding 3; the control module 6 controls the heating temperature of the magnetic metal susceptor 5 in the aerosol generating article 9 by processing the obtained voltage signal 7 of the detection winding 3 and adjusting the parameters of the high-frequency excitation current applied to the excitation winding 2 by the alternating current power supply module 1 through the feedback circuit 8; the parameters of the excitation current include one or more of the current size, the current frequency, the duty cycle, and the phase.

[0019] Preferably, the induction heating device further comprises a device housing, a cavity 10 for accommodating the aerosol generating article, a heat insulation material and a shielding material surrounding the cavity, and a direct current power supply.

[0020] The present application also provides a control method of the induction heating device, comprising the following steps: after the alternating current power supply module 1 applies current to the excitation winding 2, the temperature of the magnetic metal susceptor 5 in the heated aerosol generating article is measured non-contactly by detecting the voltage value across the detection winding 3.

[0021] Preferably, whether the aerosol generating article 9 containing the magnetic metal susceptor 5 is inserted into the induction heating device is determined by detecting the voltage jump across the detection winding 3; and the alternating current power supply module 1 applies current to the excitation winding 2 is started or interrupted.

[0022] If the voltage jump is an increase in voltage, it is determined that the aerosol generating article 9 containing the magnetic metal susceptor 5 is inserted into the induction heating device; if the voltage jump is a decrease in voltage, it is determined that the aerosol generating article 9 containing the magnetic metal susceptor 5 is extracted from the induction heating device.

[0023] Preferably, the temperature of the magnetic metal susceptor 5 in the heated aerosol generating article 9 is measured non-contactly by detecting the voltage value across the detection winding 3, which specifically comprises the following steps:

[0024] The following parameters of the currently used magnetic metal susceptor 5 are obtained: T mon , v mon , T max , v max ;

[0025] T mon is the lowest starting temperature of the current magnetic metal susceptor 5 in the induction heating temperature monotonously increasing stage with the increase of the voltage value across the detection winding 3 when the induction heating is performed by the induction heating device; v mon is the corresponding voltage value across the detection winding 3 corresponding to T mon .

[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 susceptor 5 is made of a single layer of magnetic metal, preferably having an atomic order range (i.e. grain size) less than 2 nm, a Curie temperature of 200-500°C, and a coercivity greater than 4 A / m; the single layer of magnetic metal is prepared by one or more of the following methods: melt quenching, melt continuous casting, and rolling; and has a composition comprising, by weight percentage, 70-97% of a ferromagnetic element, 1.6-6.2% of a borocarbon component, 0-10.0% of a first auxiliary element, and 0-18% of a second auxiliary element; the borocarbon component is either boron or carbon, or a combination of both; the first auxiliary element is either silicon or phosphorus, or a combination of both; the second auxiliary element is one or more 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 single layer of magnetic alloy material does not include nickel; and preferably, the single layer of magnetic metal is an iron-based single layer of magnetic alloy flake having a magnetostrictive effect, and more preferably, the iron-based single layer of magnetic alloy flake has one or more of the following defects: a hole, an indentation, a scratch, a pit, a bump, a crack, a crease, a notch, and a stress.

[0033] The aerosol generating article 9 containing the magnetic metal susceptor can include one susceptor or multiple susceptors, and preferably includes 2-10 susceptors.

[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 susceptor 5 is inserted into the induction heating device by detecting a sudden increase in the voltage across the detection winding 3, and preferably further turns on the AC power supply module 1 to apply current to the field winding 2. The control method determines that the aerosol generating article 9 containing the magnetic metal susceptor 3 is removed from the induction heating device by detecting a sudden decrease in the voltage across the detection winding 3, and preferably further turns off the AC power supply module 1 to stop applying current to the field winding 2.

[0035] After the AC power supply module 1 applies current to the field winding 2, the temperature of the magnetic metal susceptor 5 in the heated aerosol generating article is non-contact measured by detecting the voltage across the detection winding 3. After the AC power supply module 1 applies current to the field winding 2, the initial value v ini of the voltage across the detection winding 3 is detected, and the temperature corresponding to the time when the voltage across the detection winding 3 increases to v mon is determined as the monotonic starting temperature T mon . The maximum value v max of the voltage across the detection winding 3 is detected to obtain the maximum temperature T of the magnetic metal susceptor 5 in the heated aerosol generating article 9.max . The v mon greater than v ini , and not greater than v max . When the voltage value across the detection winding 3 is between v mon and v max , the temperature of the magnetic metal susceptor 5 in the aerosol generating article 9 is monotonically increased between T mon and T max , and the actual temperature of the magnetic metal susceptor 5 corresponds to the voltage value across the detection winding 3 one-to-one. The adjustment of the voltage value across the detection winding 3 by the feedback circuit 8 and the control module 6 achieves the regulation of the temperature of the magnetic metal susceptor 5.

[0036] In the inductive heating device of the present application, the excitation winding 2, the detection winding 3 and the susceptor 5 are coupled together through the magnetic lines of force 11. When the inductive heating device is working, the magnetic lines of force 11 include the magnetic lines of force generated by the excitation winding and the magnetic lines of force generated by the susceptor, both of which are superimposed in the same direction and are substantially parallel to the axis 12 of the excitation winding 2. During inductive heating, the magnetic lines of force generated by the susceptor 5 made of magnetic metal increase with the increase of temperature, reach the maximum value near the Curie temperature of the magnetic metal, and instantaneously decrease to the minimum value above the Curie temperature. At this time, although the inductive 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 susceptor will cause a change in the induced voltage in the detection winding 3 through electromagnetic induction effect. Since when the susceptor 5 is placed in the cavity surrounded by the excitation winding 2, all the magnetic lines of force generated by the susceptor enter the detection winding 3, the voltage in the detection winding 3 is not sensitive to the position deviation of the susceptor 5. Based on this, the inductive heating device and the control method thereof proposed by the present application can non-contact detect the insertion / withdrawal of the aerosol generating article containing the susceptor made of single-layer magnetic metal, detect and control the heating temperature, and are not sensitive to the position deviation of the susceptor.

[0037] Advantages of the present application:

[0038] 1. The present application detects the change of magnetic lines of force of the susceptor at different temperatures through the detection winding, and realizes temperature detection by converting the change into voltage change. The detection signal (magnetic lines of force) directly comes from the susceptor itself, avoiding the interference of parasitic parameters of components under high frequency to the measurement accuracy. The magnetic lines of force of the magnetic metal susceptor are all surrounded in the detection winding, reducing the influence of the position change of the magnetic metal susceptor on the measurement, and enabling direct measurement of the temperature of the susceptor inside the aerosol product.

[0039] 2. Through the design of passive winding, the present application overcomes the shortcomings of existing active sensor temperature measurement, such as hindering airflow, interfering with heating and increasing energy consumption.

[0040] 3. The aerosol-generating article is inserted into the induction heating device based on the voltage jump at both ends of the detection winding, which is sensitive and has strong anti-interference ability.

[0041] 4. According to experimental comparison, the aerosol-generating system and control method provided by the application are not sensitive to the position change of the magnetic metal susceptor, are suitable for plug-in recognition and temperature measurement of a single-layer magnetic metal susceptor, heating is performed based on the plug-in recognition, and the intelligent degree of the heating system is improved. BRIEF DESCRIPTION OF DRAWINGS

[0042] Features described with respect to one aspect or embodiment can also apply to other aspects and embodiments. Specific embodiments will be described below with reference to the accompanying drawings and examples, which are only intended to further describe the application.

[0043] In the drawings:

[0044] Figure 1 is a system structure diagram of the induction heating device described in the application;

[0045] Figure 2 is a partial structure diagram of the aerosol-generating system comprising the induction heating device and the aerosol-generating article described in the application;

[0046] Figure 3 is a partial structure diagram of the aerosol-generating system comprising the induction heating device and the aerosol-generating article described in the application;

[0047] Figure 4 is a corresponding relationship between the detection winding voltage and the susceptor temperature in the application;

[0048] Figure 5 is a cross-sectional view of the aerosol-generating article comprising the metal susceptor described in the application;

[0049] Figure 6 is a side view of the aerosol-generating article comprising the metal susceptor described in the application;

[0050] Figure 7 is a detection winding voltage measurement diagram corresponding to a susceptor temperature of T mon in the application;

[0051] Figure 8 is a detection winding voltage measurement diagram corresponding to a susceptor temperature of T max in the application;

[0052] Figure 9 is a detection winding voltage measurement diagram corresponding to a susceptor temperature of T mon in the application;

[0053] Figure 10 is a susceptor made of commercial three-layer metal, and the temperature of the susceptor is T max , and the corresponding detection winding voltage measured graph is shown in Fig. 2;

[0054] Figure 11 is the complete working curve of the aerosol generating system described in the present application.

[0055] The figure marks are: 1, AC power module; 2, excitation winding; 3, detection winding; 4, voltage measurement module; 5, susceptor; 6, control module; 7, voltage signal; 8, feedback control; 9, aerosol product containing susceptor; 10, cavity; 11, magnetic line; 12, axis; 13, aerosol generating substrate. DETAILED DESCRIPTION

[0056] In order to make the above-mentioned purposes, technical solutions and advantages of the present application more clear, concise and easy to understand, the specific embodiments of the present application will be described in detail below with reference to the accompanying drawings. Those skilled in the art make various modifications or supplements or adopt similar ways to replace, as long as they do not deviate from the concept of the present application, or do not exceed the scope defined by the present claims, which shall belong to the protection scope of the present application.

[0057] Figure 1 is the system structure diagram of the induction heating device described in the present application. The induction heating device is used for heating the aerosol generating product 9 containing the magnetic metal susceptor 5, and comprises an AC power 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℃. The AC power module 1 is connected with the excitation winding 2 and applies high-frequency excitation current to the excitation winding 2. The voltage measurement module 4 is connected with the detection winding 3 and measures the voltage across the detection winding 3.

[0058] The AC power module 1 can include a battery providing direct current and a DC / AC converter converting the direct current into alternating current. The battery provides a power supply voltage of 0.5V~5V and a direct current of 0.5A~10A. The DC / AC converter provides an alternating current frequency of 0.5MHz~30MHz. The AC power module 1 can 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~10mm, and surrounds the surface of the cavity 10 containing the aerosol generating product (as shown in Fig. 1). Figure 2 , Figure 3 The cross section of the winding wire is circular or rectangular, with a diameter or thickness of 0.1mm~1.5mm, a number of turns of 3~20, and a winding height of 5mm~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 to the field winding 2 by the alternating current power module 1 through a pulse width modulation (PWM) method. The control module 6 can include a memory storing various data processed by the induction heating device, some predefined parameters. The memory can be a random access memory (RAM), a dynamic random access memory (DRAM), and a static random access memory (SRAM), a read-only memory (ROM), an electrically erasable programmable read-only memory (EEPROM), and other devices having a storage function. The memory can store a reference value (or threshold value) of the amount of change in the voltage of the detection winding 3 to determine the insertion or removal of the aerosol generating article 9, and can also store the operation time of the induction heating device, the maximum number of puffs, the current number of puffs, at least one temperature profile, various data on the user's smoking pattern, etc.

[0066] In addition, the induction heating device can further include other general components, for example, other sensors (e.g., a gravity sensor, an acceleration sensor, a temperature sensor, a puff sensor, etc.), a user interface, a charging circuit, etc.

[0067] The user interface can provide information on the state of the induction heating device to the user, and can include a display or a light, a motion or vibration motor, a speaker, a button, a touch screen, a fingerprint sensor, etc. input and output interface units. The user interface can include various interface units to implement, for example, a terminal for data communication or receiving charging power, and an interface module for wireless communication (e.g., WI-FI, Bluetooth, near field communication, etc.) with an external device.

[0068] The susceptor 5 can be made of a single layer of a metallic magnetic material having a Curie temperature greater than 200℃, for example, a magnetic alloy having a total mass fraction of one or more of iron, cobalt, and nickel greater than 50%, and specifically 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, iron-based nanocrystalline, 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 large. 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 large. 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 article 9 is inserted into the cavity 10 of the induction heating device, the power supply of the detection winding generates a pulse signal a, at this time the induction heating device is triggered to start applying a weak alternating current to the excitation winding 2. If the above pulse signal is not caused by the insertion of the aerosol generating article, but is caused by other interference factors (such as accidental approach of ferromagnetic material), at this time the magnetic field generated by the excitation winding 2 is weak, and a voltage v0 is generated in the detection winding 3. If the aerosol generating article is indeed inserted into the cavity 10 of the induction heating device, at this time the voltage of the detection winding 3 is increased to v ini , (generally v ini : v0≥1.05). The control module 6 determines that the aerosol generating article is inserted into the induction heating device at this time.

[0080] S2: The control module 6 controls the alternating current power supply module 1 to apply a strengthened alternating current to the excitation winding 2, and the susceptor 5 is quickly heated, and the voltage of the detection winding 3 is increased. When the voltage of the detection winding 3 is increased to v mon , the temperature of the susceptor 5 is T mon , and when the voltage of the detection winding 3 is increased to v max , the temperature of the susceptor 5 continues to rise to a maximum value T max . At this time, the alternating current output is reduced or turned off, and the susceptor temperature decreases. Then the alternating current output is increased again, and the voltage of the detection winding 3 is increased to v max again, and the temperature of the susceptor 5 is increased to the maximum value T max again. Since this process can heat to the highest temperature and the heat output is maximum, this process can be repeated one or more times, which can be used to calibrate the AB curve between v mon , v max , and can be used to preheat the aerosol generating article to quickly reach the target temperature and generate aerosol, and the user starts to smoke.

[0081] S3: For a specific aerosol generating substrate, the optimal heating temperature T real is known, and the optimal heating temperature T real corresponding to the voltage v real of the detection winding 3 can be calculated by the foregoing calculation formula. The user's smoking behavior will introduce cold air to periodically reduce the temperature of the susceptor 5, so that the voltage between the detection winding 3 is periodically reduced. The control module 6 maintains the voltage of the detection winding 3 in a reasonable interval around v real by the feedback circuit 8, so as to ensure that the temperature of the susceptor is maintained around T real . The control module 6 increases the puff count each time the user smokes.

[0082] S4: After reaching the rated number of puffs of the aerosol generating substrate, the control module 6 controls the alternating current power module 1 to interrupt the current output, the temperature of the susceptor 5 decreases, and the voltage of the detection winding 3 continues to decrease to v ini and remains unchanged. The user removes the aerosol generating article, the voltage of the detection winding 3 drops sharply b, and the control module 6 determines that the puffing behavior ends.

[0083] Those skilled in the art related to the present embodiment can understand that various changes in form and details can be made therein without departing from the scope of the above-described features. Therefore, the disclosed method should be considered as a descriptive point of view rather than a limiting point of view. The scope of the present disclosure is defined by the appended claims rather than the foregoing description, and all differences within the scope of equivalents thereof should be interpreted as included in the present 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 (2) is taken as v max The maximum value of the voltage 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.

Images