CN116406866A - Aerosol generating device and control method thereof - Google Patents

Abstract

An aerosol-generating device and method of controlling the same, the aerosol-generating device comprising a chamber for removably receiving an aerosol-generating article; wherein the aerosol-generating article comprises a susceptor; alternatively, the aerosol-generating device comprises a susceptor, and the susceptor is movably received in or removed from the chamber with the aerosol-generating article; an oscillating circuit comprising a capacitor and an inductor inductively coupled to the susceptor; a controller configured to transmit a pulse signal to drive the oscillation circuit to generate damped oscillation; detecting an oscillating voltage signal generated by the oscillating circuit; and determining that the aerosol-generating article is received in or removed from the chamber from the oscillating voltage signal. According to the method, the pulse signal sent by the controller is used for driving the oscillating circuit to generate damped oscillation, and whether the cigarette is inserted or pulled out is judged according to the oscillating voltage signal generated by the oscillating circuit, so that the action of the heater is controlled; the implementation mode is simple, and the user experience is improved.

Description

Aerosol generating device and control method thereof

technical field

The present application relates to the field of smoking articles, in particular to an aerosol generating device and a control method thereof.

Background technique

Smoking articles such as cigarettes and cigars burn tobacco to produce smoke during use. Attempts have been made to provide alternatives to these tobacco burning articles by creating products that release compounds without burning them. Examples of such products are so-called heat-not-burn products, which release compounds by heating tobacco rather than burning it.

Contents of the invention

The present application provides an aerosol generating device on the one hand, comprising:

a chamber for removably receiving an aerosol-generating article; wherein the aerosol-generating article includes a susceptor; alternatively, the aerosol-generating device includes a susceptor and the susceptor is movably connected to the aerosol-generating article be received together with or removed from the chamber;

an oscillating circuit comprising a capacitor and an inductor inductively coupled to said susceptor;

a controller configured to send a pulse signal to drive the oscillating circuit to generate damped oscillation; detect an oscillating voltage signal generated by the oscillating circuit; and determine that the aerosol generating article is received in the cavity according to the oscillating voltage signal chamber or removed from the chamber.

Another aspect of the present application provides an aerosol generating device, comprising:

a chamber for removably receiving an aerosol-generating article; wherein the aerosol-generating article includes a susceptor; alternatively, the aerosol-generating device includes a susceptor and the susceptor is movably connected to the aerosol-generating article be received together with or removed from the chamber;

an oscillating circuit comprising a capacitor and an inductor inductively coupled to said susceptor;

a switch circuit configured to alternately turn on and off so that the inductor flows an alternating current and generates a changing magnetic field;

wherein the changing magnetic field penetrates the susceptor when the aerosol-generating article is received in the chamber such that the susceptor heats the aerosol-generating article;

Also includes:

A controller configured to send a pulse signal to the switch circuit to turn on the oscillating circuit, and make the oscillating circuit generate damped oscillation during the conduction period; detect the oscillating voltage signal generated by the oscillating circuit; according to the The oscillating voltage signal determines whether the aerosol-generating article is received or removed from the chamber.

Another aspect of the present application provides a method for controlling an aerosol generating device, the method comprising:

Send a pulse signal to drive the oscillation circuit to generate damped oscillation;

detecting an oscillating voltage signal generated by the oscillating circuit;

Based on the oscillating voltage signal, it is determined that an aerosol-generating article is received or removed from the chamber.

In the aerosol generating device and its control method provided by the present application, the pulse signal sent by the controller is used to drive the oscillating circuit to generate damped oscillation, and then judge whether the cigarette is inserted or pulled out according to the oscillating voltage signal generated by the oscillating circuit, so as to control the heating The action of the controller; the implementation method is simple, and the user experience is improved.

Description of drawings

One or more embodiments are exemplified by the pictures in the corresponding drawings, and these exemplifications do not constitute a limitation to the embodiments. Elements with the same reference numerals in the drawings represent similar elements. Unless otherwise stated, the drawings in the drawings are not limited to scale.

FIG. 1 is a schematic diagram of an aerosol generating device provided in an embodiment of the present application;

Fig. 2 is a schematic diagram of an aerosol generating product and an aerosol generating device provided in an embodiment of the present application;

Fig. 3 is a schematic diagram of an aerosol generating product provided by an embodiment of the present application;

Fig. 4 is a schematic cross-sectional view of an aerosol generating product provided by an embodiment of the present application;

Fig. 5 is a schematic diagram of a part of the circuit provided by the embodiment of the present application;

FIG. 6 is a schematic diagram of a first pulse signal provided in an embodiment of the present application;

FIG. 7 is a schematic diagram of an oscillating voltage signal provided in an embodiment of the present application;

Fig. 8 is a schematic diagram of the control method of the aerosol generating device provided by the embodiment of the present application;

Fig. 9 is a schematic diagram of the control process of the aerosol generating device provided by the embodiment of the present application.

Detailed ways

In order to facilitate the understanding of the present application, the present application will be described in more detail below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that when an element is said to be "fixed" to another element, it may be directly on the other element, or there may be one or more intervening elements therebetween. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or one or more intervening elements may be present therebetween. The terms "upper", "lower", "left", "right", "inner", "outer" and similar expressions are used in this specification for the purpose of description only.

Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by one of ordinary skill in the technical field of this application. The terminology used in the description of the present application is only for the purpose of describing a specific embodiment, and is not used to limit the present application. The term "and/or" used in this specification includes any and all combinations of one or more of the associated listed items.

As shown in Figures 1-2, the aerosol generating device provided in the embodiment of the present application includes:

The power supply 10 is a rechargeable DC battery capable of outputting DC current;

In a preferred implementation, the DC supply voltage provided by the power supply 10 is in the range of about 2.5V to about 9.0V, and the amperage of the DC current provided by the power supply 10 is in the range of about 2.5A to about 20A.

An inductor L for generating a changing magnetic field under an alternating current;

Depending on the setting in use of the product, the inductor L may comprise a cylindrical coil wound in a helical shape. The helically wound cylindrical coil may have a radius r in the range of about 5 mm to about 10 mm, and in particular the radius r may be about 7 mm. The length of the helically wound cylindrical coil may be in the range of about 8 mm to about 14 mm, and the number of turns of the coil is in the range of about 8 turns to 15 turns. Accordingly, the internal volume may be in the range of about 0.15 cm ³ to about 1.10 cm ³ .

a chamber 20 within which the aerosol-generating article 100 is removably received;

The circuit 30 is connected to the power supply 10 through proper electrical connection, and is used for converting the direct current output from the power supply 10 into an alternating current with a suitable frequency and then supplying it to the inductor L.

In a preferred implementation, the frequency of the alternating current supplied by the circuit 30 to the inductor L is between 80KHz-400KHz; more specifically, the frequency may be in the range of about 200KHz to 300KHz.

In the embodiment shown in FIG. 1 , the aerosol generating device further includes a bracket 40 for arranging the inductor L, and the material of the bracket 40 may include high-temperature-resistant non-metallic materials such as PEEK or ceramics. In implementation, the inductor L is wound on the outer wall of the bracket 40 and then fixed. Meanwhile, according to FIG. 1 , the bracket 40 has a hollow tubular shape, and a part of the tubular hollow space forms the chamber 20 for receiving the aerosol generating product 100 .

As shown in Figures 3-4, an aerosol-generating article 100 includes a filter segment 101, an aerosol-generating segment 102 having a smokeable material. The smokeable material is preferably a tobacco-containing material that releases volatile compounds from the matrix when heated; or it can also be a non-tobacco material that is suitable for electric heating and smoking after heating. The smokeable material is preferably a solid matrix, which may include one or more of powder, granules, shredded strips, strips or flakes of one or more of vanilla leaves, tobacco leaves, homogeneous tobacco, expanded tobacco; or Alternatively, the solid matrix may contain additional tobacco or non-tobacco volatile flavor compounds to be released when the matrix is heated.

The aerosol-generating article 100 also includes a susceptor 103 in thermal contact with the smokeable material. When the aerosol-generating article 100 is received or inserted into the chamber 20, the susceptor 103 can be inductively coupled with the inductor L to generate heat under the penetration of the changing magnetic field, thereby heating the smokeable material, so that at least One component evaporates to form an aerosol for inhalation.

The susceptor 103 is preferably needle-shaped, bar-shaped or leaf-shaped. The length dimension of the susceptor 103 is larger than its width dimension or its thickness dimension. The susceptor 103 may be arranged generally longitudinally within the aerosol-generating segment 102 , eg approximately parallel to the longitudinal direction of the aerosol-generating segment 102 . In a preferred embodiment, the elongated susceptor 103 may be located radially centrally within the aerosol-generating segment 102 and extend along the longitudinal axis of the strip.

The susceptor 103 can be made of any material that can be heated inductively to a temperature sufficient to aerosolize the smokeable material. Preferred susceptors 103 include metal or carbon. Preferred susceptors 103 may comprise ferromagnetic materials such as ferrite, ferromagnetic steel or stainless steel. A suitable susceptor 103 may be or may comprise aluminum. A preferred susceptor 103 may be made of 400 series stainless steel, such as grade 410, 420 or 430 stainless steel.

FIG. 5 is a schematic diagram of a part of the circuit provided in the implementation manner of the present application.

As shown in FIG. 5 , the circuit 30 includes a drive circuit 31 , a switch circuit 32 , an oscillation circuit 33 and a detection circuit 34 .

The driving circuit 31 controls the switching tubes in the switching circuit 32 to turn on and off alternately according to the control signal (input through the 8th I/O port) of the controller (not shown in the drawings).

In a preferred implementation, the drive circuit 31 is a commonly used switch tube driver of the FD2204 type, which is controlled by the controller in a PWM manner, and the 3rd and 10th I/O ports alternately output high voltages according to the pulse width of the PWM. The flat/low level further drives the first switching tube Q3 and the second switching tube Q4 to control the oscillation circuit 33 to generate resonance.

In an alternative implementation, the drive circuit 31 may be part of the controller.

The switch circuit 32 is a circuit composed of transistor switches.

In a preferred implementation, the switch circuit 32 includes a first switch tube Q3 and a second switch tube Q4, which are used to make the oscillation circuit 33 resonate through alternate on-off switching.

In an alternative implementation, the switch circuit 32 may be composed of a single switch tube.

The oscillation circuit 33 is used to form an alternating current flowing through the inductor L during the resonance process, so that the inductor L generates an alternating magnetic field to induce the susceptor 103 to generate heat.

In preferred implementation, the oscillating circuit 33 is made up of inductor L and first electric capacity C3 and second electric capacity C7; On connection, the first end of described first electric capacity C3 and the second electrode of power supply (PP_LCC among the figure shown) connection, the second end is connected to the first end of the second capacitor C7; the second end of the second capacitor C7 is connected to the first electrode (ground end) of the power supply; the second end of the inductance coil L One end is connected to the second end of the first capacitor C3, the second end is connected to the second electrode through the first switch transistor Q3, and is connected to the first electrode through the second switch transistor Q7 .

In an alternative implementation, the oscillating circuit 33 may be an LC series or parallel resonant circuit.

The detection circuit 34 is used to detect the oscillating voltage signal generated by the oscillating circuit 33 .

In a preferred implementation, the detection circuit 34 includes a first resistor R1 and a second resistor R2 connected in series between the first end of the inductor L and the first electrode (ground) of the power supply. In an alternative implementation, it is also feasible to directly detect the oscillating voltage signal generated by the oscillating circuit 33 without dividing the voltage by resistors.

Optionally, a rectifier diode D1 is also provided between the first end of the inductor L and the first resistor R1, and an anode end of the rectifier diode D1 is connected to the first end of the inductor L. The negative half-period signal is filtered out by the rectifier diode D1 to facilitate signal collection; in an alternative implementation, the negative half-period signal can be filtered out by software.

Optionally, capacitors may be connected in parallel across the second resistor R2, so that the voltage at the point TO_MCU is in a stable state.

Based on the structure and circuit of the above-mentioned aerosol generating device, the controller is configured to send a first pulse signal to drive the oscillating circuit 33 to generate damped oscillation; detect the oscillating voltage signal generated by the oscillating circuit 33; and according to the oscillating voltage signal to determine whether the aerosol-generating article 100 is received in the chamber 20 or removed from the chamber 20 .

Specifically, as shown in FIG. 6, the first pulse signal (such as a high-level signal) output by the controller, after being processed by the drive circuit 31, is also a high-level signal output through its 3rd I/O port, and the 10I The output of the /O port is a low-level signal; thus, the first switching tube Q3 is turned on, and the second switching tube Q7 is turned off. At this time, the oscillation circuit 33 generates damped oscillation and generates an oscillation voltage signal. When the aerosol generating product 100 is not received in the chamber 20, the detection port of the controller (TO_MCU in the figure) detects the oscillation voltage signal through the detection circuit 34 Refer to the upper waveform in FIG. 7 (the abscissa is time, and the ordinate is voltage value).

The duration of the first pulse signal is very short, generally, its duration is between 1 μs and 200 μs; preferably, its duration is between 50 μs and 150 μs; more preferably, its duration is between 80 μs and 150 μs; further preferably , and its duration is between 80μs and 120μs. In this example, the duration of the first pulse signal is 100 μs.

It should be noted that the upper waveform in FIG. 7 is detected when the detection circuit 34 is not provided with the rectifier diode D1; it is easy to imagine that when the detection circuit 34 is provided with the rectifier diode D1, the negative half cycle The signal is filtered out, and the obtained voltage is greater than or equal to 0V voltage, which is convenient for the controller to collect.

When the aerosol-generating product 100 is received in the chamber 20, due to the inductive coupling between the susceptor 103 and the inductor L, the Q factor (quality factor) will change, and then the oscillating voltage signal output by the oscillating circuit 33 will decay faster. . When the aerosol generating product 100 is received in the chamber 20, the oscillating voltage signal detected by the detection port (TO_MCU in the figure) of the controller through the detection circuit 34 can refer to the waveform below in FIG. 7 (the abscissa is time, and the ordinate is the voltage value).

Based on the above principles, the peak voltage is determined according to the detected oscillating voltage signal, for example, the peak value of a certain half-wave in the positive half-cycle, and then it is determined whether the aerosol generating article 100 is received or removed from the chamber 20 .

In one example, the controller is configured to compare the peak voltage with a preset threshold voltage; and determine whether the aerosol-generating article 100 is received or removed from the chamber 20 based on the result of the comparison. The preset threshold voltage can be obtained through measurement or experiment. Taking the waveform below in FIG. 7 as an example, it is possible to determine the peak voltage of the Nth half-wave of a sampling period, compare the peak voltage with a preset threshold voltage, and then determine that the aerosol generating product 100 is received in the chamber 20 or Remove from chamber 20. It can be easily imagined that, in order to make the comparison result more accurate, it can be determined that the aerosol generating article 100 is received in the chamber 20 or removed from the chamber 20 according to a plurality of comparison results.

In an example, the controller is configured to determine the amount of change or the rate of change of the peak voltage according to the peak voltage; remove. Still taking the waveform below in Figure 7 as an example, the peak voltages of M consecutive half-waves in one sampling period can be determined, and the variation or rate of change of the peak voltages of two half-waves in M can be calculated, and the variation or The change rate is compared with a preset value (preset change threshold or preset change rate threshold), and then it is determined whether the aerosol generating article 100 is received in the chamber 20 or removed from the chamber 20 .

In further implementation, the inflection point detection method can be used, for example: first determine the rate of change of the peak voltage of each sampling period in multiple sampling periods, and then judge whether the rate of change in the adjacent sampling period has a sudden change, and then determine the aerosol generation The article 100 is received in or removed from the chamber 20 .

In one example, the controller is configured to determine an average or cumulative value of peak voltages from said peak voltage; Remove from the chamber. Still taking the waveform below in Figure 7 as an example, you can determine the peak voltages of M consecutive half-waves in one sampling period, and calculate the average or accumulated value of the peak voltages of M half-waves (you can also choose from M values several values), compare the average value or cumulative value with a preset value (preset average value threshold or preset cumulative value threshold), and then determine that the aerosol generating article 100 is received in the chamber 20 or from Chamber 20 is removed.

Upon determining that an aerosol-generating article 100 is received in chamber 20, heating may be automatically initiated. That is, the second pulse signal is output from the 3rd and 10th I/O ports to drive the first switching tube Q3 and the second switching tube Q4 to turn on or off alternately, forming an alternating current flowing through the inductor L, so that the inductor The device L generates an alternating magnetic field to induce the susceptor 103 to generate heat. Wherein, the frequency of the first pulse signal is lower than the frequency of the second pulse signal.

When it is determined that the aerosol-generating article 100 is removed from the chamber 20, the heating can be stopped.

In an example, the controller further includes a timer;

The controller is further configured to control the timer to start timing and start detecting the oscillating voltage signal when the first pulse signal is output; when the timing time of the timer reaches a preset time threshold, stop detecting The oscillating voltage signal is then used to determine whether the aerosol-generating article 100 is received or removed from the chamber 20 based on the detected oscillating voltage signal.

In this example, the preset time threshold is less than the duration of the first pulse signal.

Fig. 8 is a schematic diagram of a control method of an aerosol generating device provided in an embodiment of the present application. The aerosol generating device is consistent with the foregoing content, and will not be repeated here.

The methods include:

Step S10, sending a first pulse signal to drive the oscillation circuit to generate damped oscillation;

Step S11, detecting the oscillating voltage signal generated by the oscillating circuit;

Step S12 , according to the oscillating voltage signal, it is determined that the aerosol generating product is received or removed from the chamber.

In an example, said determining that an aerosol-generating article is received or removed from the chamber based on said oscillating voltage signal comprises:

determining the peak voltage based on the detected oscillating voltage signal;

The aerosol-generating article is received or removed from the chamber based on the peak voltage.

In an example, said determining that said aerosol-generating article is received or removed from said chamber based on said peak voltage comprises:

comparing the peak voltage with a preset threshold voltage;

The aerosol-generating article is determined to be received or removed from the chamber based on the comparison.

In an example, said determining that said aerosol-generating article is received or removed from said chamber based on said peak voltage comprises:

determining the amount of change or rate of change of the peak voltage by the peak voltage;

The aerosol-generating article is received or removed from the chamber based on the amount or rate of change of the peak voltage.

In an example, the method also includes:

Said determining from said peak voltage that said aerosol-generating article is received or removed from said chamber comprises:

Determining an average value or an accumulated value of the peak voltage through the peak voltage;

The receipt or removal of the aerosol-generating article from the chamber is determined from an average or cumulative value of the peak voltages.

In an example, the method also includes:

When the first pulse signal is output, the control timer starts timing and starts to detect the oscillating voltage signal; when the timing time of the timer reaches the preset time threshold, stop detecting the oscillating voltage signal, and then An oscillating voltage signal to determine receipt or removal of the aerosol-generating article from the chamber.

The control process of the aerosol generating device is illustrated below in conjunction with FIG. 9:

Step S21, the controller outputs the first pulse signal and starts timing;

The function of whether the aerosol-generating article 100 is received in the chamber 20 can be activated by a timed wake-up function.

Step S22, the controller detects the oscillation voltage signal output by the oscillation circuit 33 through the detection circuit 34;

Step S23, the controller obtains the counting time of the timer, and judges whether the counting time exceeds the preset time threshold; if it does not exceed the preset time threshold, proceed to step S22;

Step S24, if the preset time threshold is exceeded, stop detecting the oscillating voltage signal;

Step S25, the controller determines the peak voltage according to the detected oscillation voltage signal;

Step S26, the controller determines whether the peak voltage is less than or equal to the preset threshold voltage; if the peak voltage is greater than the preset threshold voltage, it can be determined that the aerosol generating product 100 is not received in the chamber 20; continue to execute step S21;

Step S27, if the peak voltage is less than or equal to the preset threshold voltage, it can be determined that the aerosol generating product 100 is received in the chamber 20;

Step S28, start the heating of the aerosol generating device.

It should be noted that, unlike the examples shown in FIGS. 1-9 , in other examples, the receptor can be arranged in the aerosol generating device, and the receptor can be movably received in the aerosol generating product 100 together with the aerosol generating product 100 The chamber 20 is or is removed from said chamber 20 . For example: the susceptor may be provided in an extractor or a heating cartridge (not shown in the drawings) of an aerosol generating device, the extractor or heating cartridge is received in the chamber 20 together with the aerosol generating article 100 or from the chamber 20 In this way, when the extractor or the heating cartridge is received or inserted into the chamber 20 together with the aerosol generating article 100, the controller can determine that the aerosol generating article 100 is received in the chamber 20 in the aforementioned manner, and then activate the gas Heating of the sol-generating device; and vice versa.

It should be noted that, the examples in Fig. 1 to Fig. 9 are all described in the manner of electromagnetic heating. Different from the above example, in other examples, resistance heating, infrared heating, etc. can be used; at this time, the aerosol generating device can also include a separate heating element, while the susceptor, oscillation circuit, etc. are only used for aerosol generation Inspection of the article; the heating element can be inserted into the aerosol-generating article for heating, or placed on the periphery of the aerosol-generating article for heating.

It should be noted that preferred embodiments of the application are given in the specification and accompanying drawings of the application, but the application can be implemented in many different forms, and are not limited to the embodiments described in the specification. These embodiments are not intended as additional limitations on the content of the present application, and the purpose of providing these embodiments is to make the understanding of the disclosure of the present application more thorough and comprehensive. Moreover, the above-mentioned technical features continue to be combined with each other to form various embodiments not listed above, which are all regarded as the scope of the description of the present application; furthermore, for those of ordinary skill in the art, improvements or changes can be made according to the above description , and all these improvements and transformations should belong to the scope of protection of the appended claims of this application.

Claims (16)

1. An aerosol-generating device configured to heat an aerosol-generating article to generate an aerosol; characterized by comprising the following steps:

a chamber for removably receiving an aerosol-generating article; wherein the aerosol-generating article comprises a susceptor; alternatively, the aerosol-generating device comprises a susceptor, and the susceptor is movably received in or removed from the chamber with the aerosol-generating article;

an oscillating circuit comprising a capacitor and an inductor inductively coupled to the susceptor;

a controller configured to transmit a pulse signal to drive the oscillation circuit to generate damped oscillation; detecting an oscillating voltage signal generated by the oscillating circuit; and determining that the aerosol-generating article is received in or removed from the chamber from the oscillating voltage signal.

2. An aerosol-generating device according to claim 1, further comprising a detection circuit comprising a first resistor and a second resistor connected in series between one end of the inductor and a first electrode of a power supply;

the controller is configured to detect the oscillating voltage signal by the detection circuit.

3. An aerosol-generating device according to claim 2, wherein the detection circuit further comprises a rectifier diode;

the rectifier diode is connected between one end of the inductor and the first resistor, or between one end of the inductor and the second resistor.

4. An aerosol-generating device according to claim 1, further comprising a switching circuit configured to receive the pulse signal and to conduct an electrical connection between the oscillating circuit and a power supply upon receipt of the pulse signal.

5. An aerosol-generating device according to claim 4, wherein the switching circuit comprises a first switching tube and a second switching tube connected in series, the capacitor comprising a first capacitor and a second capacitor;

the first end of the first capacitor is connected with the second electrode of the power supply, and the second end of the first capacitor is connected with the first end of the second capacitor; the second end of the second capacitor is connected with the first electrode of the power supply;

the first end of the inductance coil is connected with the second end of the first capacitor, and the second end of the inductance coil is connected with the second electrode through the first switch tube and the first electrode through the second switch tube.

6. An aerosol-generating device according to claim 4, wherein the controller is further configured to control the switching circuit to alternately turn on and off such that the inductor flows an alternating current and generates a varying magnetic field;

the susceptor is configured to be penetrated by a varying magnetic field to generate heat to heat the aerosol-generating article.

7. An aerosol-generating device according to claim 1, wherein the controller further comprises a timer;

the controller is further configured to control the timer to start timing and start detecting the oscillating voltage signal when the pulse signal is transmitted; when the timing time of the timer reaches a preset time threshold, the detection of the oscillating voltage signal is stopped, and then the aerosol-generating article is determined to be received in or removed from the chamber according to the detected oscillating voltage signal.

8. An aerosol-generating device according to claim 7, wherein the preset time threshold is less than the duration of the pulse signal.

9. Aerosol-generating device according to claim 1, characterized in that the pulse signal has a duration of between 1 and 200 μs.

10. An aerosol-generating device, comprising:

a chamber for removably receiving an aerosol-generating article; wherein the aerosol-generating article comprises a susceptor; alternatively, the aerosol-generating device comprises a susceptor, and the susceptor is movably received in or removed from the chamber with the aerosol-generating article;

an oscillating circuit comprising a capacitor and an inductor inductively coupled to the susceptor;

a switching circuit configured to be alternately turned on and off so that the inductor flows an alternating current and generates a varying magnetic field;

wherein, when the aerosol-generating article is received in the chamber, the varying magnetic field penetrates the susceptor to cause the susceptor to heat the aerosol-generating article;

further comprises:

a controller configured to transmit a pulse signal to the switching circuit to turn on the oscillating circuit and cause the oscillating circuit to generate damped oscillation during the turn-on; detecting an oscillating voltage signal generated by the oscillating circuit; from the oscillating voltage signal, it is determined that the aerosol-generating article is received in or removed from the chamber.

11. A method of controlling an aerosol-generating device, the method comprising:

transmitting a pulse signal to drive an oscillating circuit to generate damped oscillation;

detecting an oscillating voltage signal generated by the oscillating circuit;

from the oscillating voltage signal, it is determined that the aerosol-generating article is received in or removed from the chamber.

12. A method according to claim 11, wherein said determining, from the oscillating voltage signal, that an aerosol-generating article is received in or removed from the chamber comprises:

determining a peak voltage from the detected oscillating voltage signal;

determining from the peak voltage that the aerosol-generating article is received in or removed from the chamber.

13. A method according to claim 12, wherein the determining from the peak voltage that the aerosol-generating article is received in or removed from the chamber comprises:

comparing the peak voltage with a preset threshold voltage;

determining from the comparison that the aerosol-generating article is received in or removed from the chamber.

14. A method according to claim 12, wherein the determining from the peak voltage that the aerosol-generating article is received in or removed from the chamber comprises:

determining the variation or the variation rate of the peak voltage through the peak voltage;

determining that the aerosol-generating article is received in or removed from the chamber according to an amount or rate of change of the peak voltage.

15. A method according to claim 12, wherein the determining from the peak voltage that the aerosol-generating article is received in or removed from the chamber comprises:

determining an average or accumulated value of the peak voltages from the peak voltages;

determining that the aerosol-generating article is received in or removed from the chamber based on an average or accumulated value of the peak voltage.

16. A method of controlling an aerosol-generating device, the method comprising:

transmitting a pulse signal having a first frequency to detect an oscillating voltage signal generated by an oscillating circuit, determining from the oscillating voltage signal that an aerosol-generating article is received in or removed from the chamber; the pulse signal with the first frequency is used for driving the oscillating circuit to generate damped oscillation;

upon determining that the aerosol-generating article is received in the chamber, transmitting a pulse signal having a second frequency to begin heating the aerosol-generating article; wherein the first frequency is less than the second frequency.

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