JP7684516B2 - Aerosol generating device and control method thereof - Google Patents

Description

CROSS-REFERENCE TO RELATED APPLICATIONS
This application claims priority to a Chinese patent application with application number 202111048301.8, titled "Aerosol generating device and control method thereof", filed with the China Patent Office on September 8, 2021, the entire contents of which are incorporated herein by reference.
The present application relates to the field of smoking articles, and in particular to an aerosol generating device and a method for controlling the same.

Tobacco products, such as cigarettes and cigars, produce smoke by burning tobacco during use. As an alternative to these products that burn tobacco, attempts have been made to produce products that release compounds without burning tobacco. One example of such a product is a heat-not-burn product, which releases compounds by heating tobacco rather than burning it.

The patent document with publication number CN111511233A discloses an aerosol generator and its operating method, in which an electromagnetic inductor is provided on a cigarette, and a detector with a coil is provided on the aerosol generator, and electromagnetic induction occurs between the coil and the electromagnetic inductor, and a change in the characteristics of the current generated by the electromagnetic induction and flowing through the coil can be detected to determine the insertion state of the cigarette inserted into the aerosol generator.

The purpose of this application is to provide an aerosol generating device and a control method thereof that differs from conventional cigarette insertion detection methods.

On the one hand, the present application
a cavity for removably receiving an aerosol generating product including a magnetic material;
a heater for heating an aerosol generating product received in the cavity to generate an aerosol;
a detection circuit including a capacitor connected in series with the heater;
and a controller configured to control direct current to flow through the detection circuit and determine that the aerosol-generating product has been received into the cavity or that the aerosol-generating product has been removed from the cavity based on the duration until the potential difference across the capacitor reaches a predetermined potential difference threshold.

On the other hand, the present application provides a method for controlling an aerosol generating device including a cavity, a heater, and a detection circuit including a capacitor connected in series with the heater, the method comprising the steps of:
controlling the detection circuit to pass a direct current;
and determining that the aerosol-generating product has been accepted into the cavity or that the aerosol-generating product has been removed from the cavity based on the duration until the potential difference across the capacitor reaches a predetermined potential difference threshold.

The aerosol generating device and control method provided in this application determine whether a cigarette is inserted into the heating cavity based on the time it takes for the potential difference across the capacitor to reach a predetermined potential difference threshold, and further control the operation of the control heater, which is simple to implement and improves the user experience.

One or more embodiments are illustrated by way of example only and not by way of limitation in the accompanying drawing figures, in which elements having the same reference numerals in the drawings represent similar elements, and the drawings are not to scale unless otherwise specified.
FIG. 1 is a schematic diagram of an aerosol generating device provided in an embodiment of the present application. 1 is a schematic diagram of an aerosol generating product provided in an embodiment of the present application. FIG. 2 is a schematic diagram of a controller provided in an embodiment of the present application. FIG. 2 is a schematic diagram of a detection circuit and a switching transistor circuit provided in an embodiment of the present application. FIG. 2 is a schematic diagram of a method for controlling an aerosol generating device provided in an embodiment of the present application. FIG. 2 is a schematic diagram of a control process of the aerosol generating device provided in an embodiment of the present application.

In order to facilitate understanding of the present application, the present application will be described in more detail below in conjunction with the drawings and specific embodiments. It should be noted that when an element is described as being "fixed" to another element, it may be directly located on the other element, or there may be one or more intervening elements therebetween. When an element is described as being "connected" to another element, it may be directly connected to the other element, or there may be one or more intervening elements therebetween. The terms "upper", "lower", "left", "right", "inner", "outer" and similar descriptions used herein are for illustrative purposes only.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. As used herein, the terms used in the specification of this application are for the purpose of describing specific embodiments only and are not intended to be limiting of this application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

FIG. 1 is a schematic diagram of an aerosol generating device provided in an embodiment of the present application. The aerosol generating device includes:
a cavity A in which an aerosol generating product 40 is removably received;
a heater 10 that is inserted into the aerosol generating product 40 when the aerosol generating product 40 is received in the cavity A to heat the aerosol and generate the aerosol;
A battery cell 20 for supplying power;
and a circuit board 30 provided between the battery cell 20 and the heater 10.
The circuit board 30 has various circuits integrated thereon for controlling the aerosol generating device, such as controlling the battery cell 20 to supply power to the heater 10 .

The aerosol generating product 40 preferably employs a tobacco-containing material that releases volatile compounds from the substrate upon heating, or may be a non-tobacco material suitable for electrically heated smoking after heating. The aerosol generating product 40 preferably employs a solid substrate and may include one or more of powders, particles, elongated pieces, strips or sheets of one or more of vanilla leaf, tobacco leaf, homogenized tobacco, expanded tobacco, or the solid substrate may include additional tobacco or non-tobacco volatile flavor compounds to be released when the substrate is heated. In some examples, the aerosol generating product 40 includes a liquid substrate, or a carrier carrying the liquid substrate, or a container carrying the liquid substrate.

It should be noted that the heating method of the heater 10 includes, but is not limited to, resistance heating, electromagnetic heating, and infrared heating. As illustrative examples, the shape of the heater 10 includes, but is not limited to, a needle, pin, tube, or sheet.

It should also be noted that, unlike the example of FIG. 1, in other examples, the heater 10 is configured to heat at least a portion of the aerosol generating product 40, i.e., what is commonly referred to as circumferential heating or peripheral heating, is also possible.

Figure 2 is a schematic diagram of an aerosol generating product provided in an embodiment of the present application.

The aerosol generating product 40 includes a filter segment 41 and an aerosol generating segment 42 having a respirable material. In a preferred embodiment, the aerosol generating product 40 is provided with a magnetic material 43. The magnetic material 43 may be a ferromagnetic material or other material having a magnetic permeability of about 100 H/m or more. The magnetic material 43 may be a coating formed on the outer surface of the aerosol generating product 40, for example, near the lower end of the aerosol generating segment 42, or may be a component provided on the outer surface of the aerosol generating product 40, or the magnetic material 43 may be within the aerosol generating product 40 and mixed with the respirable material.

Figure 3 is a schematic diagram of a controller provided in an embodiment of the present application, and Figure 4 is a schematic diagram of a detection circuit and a switching transistor circuit provided in an embodiment of the present application.

In this example, the controller 31, the detection circuit 32, and the switching transistor circuit 33 are integrated on a circuit board 30. Of course, they may be integrated on a separate circuit board. The controller 31 employs an MCU (Micro Controller Unit). It is understandable that in other examples, the controller 31 may use a dedicated integrated chip, or other chips with processor functionality.

In this example, the controller 31 has a TEST_VCC port, a TEST_AIN port, a PWM_0UT_P port, and a PWM_0UT_N port.

The detection circuit 32 includes a resistor R2 and a capacitor C2, which are connected in series with the heater 10. Specifically, one end of the resistor R2 is electrically connected to the TEST_VCC port of the controller 31, the other end of the resistor R2 is electrically connected to one end of the heater 10 (indicated as WH+ in the figure), the other end of the heater 10 (indicated as WH- in the figure) is electrically connected to one end of the capacitor C2 and the TEST_AIN port of the controller 31, and the other end of the capacitor C2 is connected to ground.

The switching transistor circuit 33 includes a switching transistor Q3, a switching transistor Q5, and a switching transistor Q7. In this example, the switching transistor Q3 and the switching transistor Q7 are NMOS transistors, and the switching transistor Q5 is a PMOS transistor. The PWM_0UT_P port of the controller 31 is electrically connected to the gate of the switching transistor Q3, the drain of the switching transistor Q3 is electrically connected to the gate of the switching transistor Q5, and the source of the switching transistor Q3 is grounded. The source of the switching transistor Q5 is electrically connected to the battery cell 20 (shown as VBAT in the figure), and the drain of the switching transistor Q5 is electrically connected to one end of the heater 10 (shown as WH+ in the figure). The PWM_0UT_N port is electrically connected to the gate of the switching transistor Q7, the drain of the switching transistor Q7 is electrically connected to the other end of the heater 10 (shown as WH- in the figure), and the source of the switching transistor Q7 is grounded. Other elements and their electrical connection relationships can be seen in FIG. 3. The switching transistor circuit 33 is configured to be able to make or break the electrical connection between the heater 10 and the battery cell 20 (shown as VBAT in the figure).

In this example, the controller 31 is configured to output a control signal to control the switching transistor circuit 33 to turn off, and when the switching transistor circuit 33 is turned off and after the timer timing time is reached, to control the detection circuit 32 to allow direct current to flow, and to determine that the aerosol generating product 40 has been received into the cavity A or that the aerosol generating product 40 has been removed from the cavity A based on the duration until the potential difference across the capacitor C2 reaches a predetermined potential difference threshold, and further to control the operation of the heater 10.

Specifically, the controller 31 controls the PWM_OUT_P port to output a low level, thereby turning off the switching transistor Q3, and further turns off the switching transistor Q5, and controls the PWM_OUT_N port to output a low level, thereby turning off the switching transistor Q7, thereby cutting off the electrical connection between the heater 10 and the battery cell 20.

A timer (not shown) is integrated into the controller 31, and a timing wake-up function initiates a function to determine whether the aerosol generating product 40 has been received into cavity A, and controls the operation of the heater 10, i.e., controls the heater 10 to start or stop heating.

The controller 31 can control the TEST_VCC port to output a high level so that direct current flows through the detection circuit 32.

As shown in FIG. 4, the heater 10 may be equivalent to a series connection of a resistance R and an inductance L, where the resistance R is a fixed value, but the amount of inductance L is related to whether the aerosol generating product 40 is received in the cavity A, i.e., related to the insertion of the aerosol generating product 40 into the cavity A.

The circuit impedance of the detection circuit 32 is given by
formula
where |Z| is the circuit impedance, X _L is the inductive reactance of inductance L, and X _c2 is the capacitive reactance of capacitor C2.

Changing the amount of inductance L affects the magnitude of the circuit impedance |Z|, which in turn changes the charging time of capacitor C2. Specifically, when the aerosol generating product 40 is inserted into cavity A, the aerosol generating product 40, which includes a magnetic material, can increase the amount of inductance L, thereby increasing the circuit impedance |Z|.

Therefore, after the controller 31 controls the TEST_VCC port to output a high level, the charging time before and after the capacitor C2 is different when the aerosol generating product 40 is not inserted into cavity A and when the aerosol generating product 40 is inserted into cavity A. The charging time of the capacitor C2 when the aerosol generating product 40 is inserted into cavity A is greater than the charging time of the capacitor C2 when the aerosol generating product 40 is not inserted into cavity A.

Based on the above principle, it is possible to determine whether the aerosol-generating product 40 has been accepted into the cavity A or whether the aerosol-generating product 40 has been removed from the cavity A based on the duration until the potential difference across the capacitor C2 reaches a predetermined potential difference threshold, and further control the operation of the heater 10.

In this example, the TEST_AIN port of controller 31 is an interrupt port, and a timer (not shown) is integrated within controller 31.

When the controller 31 controls the TEST_VCC port to output a high level, it controls the timer to start timing, and interrupts timing when the potential difference across the capacitor C2 reaches a predetermined potential difference threshold, obtains the time counted by the timer, and based on the time counted by the timer, determines that the aerosol generating product 40 has been accepted into the cavity A or that the aerosol generating product 40 has been removed from the cavity A, and is further configured to control the operation of the heater 10.

In this example, the predetermined potential difference threshold is a high level, and may be the potential difference between both ends of capacitor C2 when it is fully charged, or may be lower than the potential difference between both ends of capacitor C2 when it is fully charged.

As an optional embodiment, the duration until the potential difference across capacitor C2 reaches a predetermined potential difference threshold can be compared to a predetermined time threshold.

If the duration until the potential difference across capacitor C2 reaches the predetermined potential difference threshold is greater than the predetermined time threshold, it can be determined that the aerosol generating product 40 has been received into cavity A, in which case a control signal (e.g., a square wave signal) is output to control and operate the switching transistor circuit 33, and further activate the heater 10 to provide heating.

If the duration until the potential difference across capacitor C2 reaches the predetermined potential difference threshold is equal to or less than the predetermined time threshold, it can be determined that the aerosol generating product 40 has not been received in cavity A, in which case the switching transistor circuit 33 is controlled to remain off, i.e., the heater 10 is in an unheated state.

Here, the predetermined time threshold can be the duration until the potential difference across capacitor C2 reaches a predetermined potential difference threshold when the aerosol generating product 40 is not received in cavity A.

By the above judgment, when the aerosol generating product 40 is inserted into the cavity A, the heater 10 can be automatically controlled to start heating, eliminating the need to operate a button and improving the user experience. On the other hand, when an aerosol generating product 40 that does not contain a magnetic material is inserted into the cavity A, the change in the circuit impedance |Z| is very small, and therefore there is almost no change in the time it takes for the potential difference across the capacitor C2 to reach a predetermined potential difference threshold. In this case, the heater 10 is not automatically controlled to start heating, thereby serving to prevent counterfeiting.

As another optional embodiment, the difference between the duration until the potential difference across capacitor C2 reaches a predetermined potential difference threshold and a predetermined time threshold can be determined, and if the difference is less than or equal to the predetermined difference threshold and greater than zero, a control signal (e.g., a square wave signal) is output to control and operate the switching transistor circuit 33 and further activate the heater 10 to heat, and if the difference is greater than the predetermined difference threshold or the difference is less than or equal to zero, the switching transistor circuit 33 is controlled to remain off.

In this embodiment, the aerosol-generating product 40 with a magnetic material can make the time interval between when the aerosol-generating product 40 is inserted into the cavity A and when the aerosol-generating product 40 is not inserted into the cavity A constant due to the consistency of the magnetic material. Therefore, by determining that the difference between the duration until the potential difference across the capacitor C2 reaches the predetermined potential difference threshold and the predetermined time threshold is within a predetermined range, it is determined that the aerosol-generating product 40 is accepted into the cavity A, and the heater 10 can be automatically controlled to start heating, without the need for button operation, improving the user experience. Otherwise, if the difference between the duration until the potential difference across the capacitor C2 reaches the predetermined potential difference threshold and the predetermined time threshold is greater than the predetermined difference threshold, it can be determined that the aerosol-generating product 40 is a counterfeit product, and in this case, the heater 10 is not controlled to start heating. Furthermore, if the difference between the duration until the potential difference across capacitor C2 reaches the predetermined potential difference threshold and the predetermined time threshold is equal to or less than zero, it can be determined that the aerosol generating product 40 has not been inserted into cavity A, and in this case too, the heater 10 is not controlled to start heating.

In the two embodiments described above, when the heater 10 is controlled to start heating, if the heater 10 is in the heating gap, the determination of whether the aerosol-generating product 40 is received in the cavity A can be started again. If the aerosol-generating product 40 is inserted in the cavity A, heating continues, and if the aerosol-generating product 40 is removed from the cavity A, heating stops. The determination process can refer to the above-described embodiments.

It should be noted that in this example, the heating gap refers to the time period between two adjacent high (or low) levels in the square wave signal.

It should be further noted that, unlike the above example, in other examples, the controller 31 may not interrupt, i.e., the TEST_AIN port is a general port. In this case, the controller 31 obtains the time count of the timer when the potential difference across the capacitor C2 reaches a predetermined potential difference threshold. The subsequent process is similar to that described above, and will not be described here.

Figure 5 is a schematic diagram of a method for controlling an aerosol generator provided in an embodiment of the present application. The aerosol generator is the same as that described above, and a description thereof will be omitted here.

The method comprises:
Step S11: controlling the detection circuit 32 so that a direct current flows;
and step S12 of determining that the aerosol-generating product 40 has been received into cavity A or that the aerosol-generating product 40 has been removed from cavity A based on the duration until the potential difference across capacitor C2 reaches a predetermined potential difference threshold.

In one example, the method comprises:
a step of controlling a timer to start timing when controlling the flow of direct current through the detection circuit 32;
acquiring a time count of the timer when the potential difference across the capacitor C2 reaches a predetermined potential difference threshold;
determining that the aerosol-generating product 40 has been received into the cavity A or that the aerosol-generating product 40 has been removed from the cavity A based on the time counted by the timer.

In one example, the method comprises:
outputting a first control signal to control the switching transistor circuit 33 to be turned off;
controlling the detection circuit 32 so that a direct current flows when the switching transistor circuit 33 is turned off;
and determining that the aerosol-generating product 40 has been received into cavity A or that the aerosol-generating product 40 has been removed from cavity A based on the duration until the potential difference across capacitor C2 reaches a predetermined potential difference threshold.

In one example, the step of determining that the aerosol-generating product 40 has been admitted to or removed from the cavity A based on the duration of time it takes for the potential difference across the capacitor C2 to reach a predetermined potential difference threshold comprises:
comparing a duration until the potential difference across the capacitor C2 reaches a predetermined potential difference threshold with a predetermined time threshold;
if the duration until the potential difference across the capacitor C2 reaches the predetermined potential difference threshold is greater than the predetermined time threshold, outputting a second control signal to control and operate the switching transistor circuit 33, and further starting the heater 10 to perform heating;
and controlling the switching transistor circuit 33 to remain off if the duration until the potential difference across the capacitor C2 reaches the predetermined potential difference threshold is less than or equal to a predetermined time threshold.

In one example, the step of determining that the aerosol-generating product 40 has been admitted to or removed from the cavity A based on the duration of time it takes for the potential difference across the capacitor C2 to reach a predetermined potential difference threshold comprises:
determining a difference between a duration until the potential difference across the capacitor C2 reaches a predetermined potential difference threshold and a predetermined time threshold;
if the difference is equal to or less than a predetermined difference threshold and is greater than zero, outputting a third control signal to control and operate the switching transistor circuit 33, and further activating the heater 10 to perform heating;
and controlling the switching transistor circuit to remain off if the difference is greater than a predetermined difference threshold.

In one example, the method comprises:
controlling the detection circuit 32 to allow direct current to flow when the timer reaches a timing time;
and determining that the aerosol-generating product 40 has been received into cavity A or that the aerosol-generating product 40 has been removed from cavity A based on the duration until the potential difference across capacitor C2 reaches a predetermined potential difference threshold.

Figure 6 is a schematic diagram of the control process of the aerosol generating device provided in an embodiment of the present application.

Specifically, the control process includes the following steps S21, S22, S23, S24, S25, S26, S27, and S28.

In step S21, the switching transistor circuit 33 is turned off.
The controller 31 controls the PWM_OUT_P port to output a low level, turns off the switching transistor Q3, and further turns off the switching transistor Q5, and at the same time controls the PWM_OUT_N port to output a low level and turns off the switching transistor Q7, thus disconnecting the electrical connection between the heater 10 and the battery cell 20.

In step S22, it is determined whether or not the timing of the timer has elapsed.
The timing wake-up function initiates a function to determine whether or not an aerosol generating product 40 has been received into cavity A and controls the operation of heater 10. If the timer timing period has not been reached, switching transistor circuit 33 remains off.

In step S23, when the TEST_VCC port is controlled to output a high level, the timer is controlled to start timing.

In step S24, whether the TEST_AIN port received an interrupt signal.

In step S25, the time measured by the timer is acquired.
For example, a high level signal causes an interrupt and the timer's time is read by the interrupt program.

In step S26, it is determined whether the time measured by the timer is greater than a predetermined time threshold value;
If it is greater than the predetermined time threshold, execute step S27; otherwise, it can be determined that the aerosol generating product 40 has not been received in cavity A, and the switching transistor circuit 33 is kept off to wait for the timing wake-up.

In steps S27 and S28, it is determined that the aerosol generating product 40 has been received in cavity A, in which case a square wave signal is output to control the switching transistor circuit 33, and the heater 10 is further activated to heat the product.

It should be noted that although the specification and drawings of this application show preferred embodiments of this application, this application can be realized in many different forms and is not limited to the embodiments described herein, and these embodiments are not additional restrictions on the contents of this application, but are provided to provide a more detailed, deeper and complete understanding of the disclosure of this application. In addition, the continued combination of the above technical features with each other to form various embodiments not listed above is all considered to be within the scope of the description of this application. Furthermore, a person skilled in the art may make improvements or modifications based on the above description, and all of these improvements and modifications shall fall within the scope of protection of the claims attached to this application.

Claims (16)

a cavity for removably receiving an aerosol generating product including a magnetic material;
a heater for heating an aerosol generating product received in the cavity to generate an aerosol;
a detection circuit including a capacitor connected in series with the heater;
and a controller configured to control direct current to flow through the detection circuit and determine that the aerosol-generating product has been received into the cavity or that the aerosol-generating product has been removed from the cavity based on the duration until the potential difference across the capacitor reaches a predetermined potential difference threshold. The aerosol generating device according to claim 1, characterized in that the detection circuit further includes a resistor connected in series. the controller includes a first port, one end of the detection circuit is electrically connected to the first port and the other end is electrically connected to ground;
2. The aerosol generating device according to claim 1, wherein the controller is configured to control the first port to output a high level so that a direct current flows through the detection circuit. the controller includes a second port, one end of the capacitor is electrically connected to the second port and the heater, and the other end is electrically connected to ground;
the controller further includes a timer;
The aerosol generating device of claim 3, characterized in that the controller is configured to control the timer to start timing when it controls the first port to output a high level, and obtain the potential difference across the capacitor through the second port, and obtain the time counted by the timer when the potential difference across the capacitor reaches a predetermined potential difference threshold, and determine that the aerosol generating product has been accepted into the cavity or that the aerosol generating product has been removed from the cavity based on the time counted by the timer. the controller includes an interrupt port, one end of the capacitor is electrically connected to the interrupt port and the heater, and the other end is electrically connected to ground;
the controller further includes a timer;
The aerosol generating device of claim 3, characterized in that the controller is configured to, when controlling the first port to output a high level, control the timer to start timing, and stop timing when the potential difference across the capacitor reaches a predetermined potential difference threshold, obtain the time counted by the timer, and determine that the aerosol generating product has been accepted into the cavity or that the aerosol generating product has been removed from the cavity based on the time counted by the timer. further comprising a switching transistor circuit;
the switching transistor circuit is configured to establish or break an electrical connection between the heater and the battery cell;
The aerosol generating device of claim 1, wherein the controller is configured to output a first control signal to control the switching transistor circuit to turn off, and when the switching transistor circuit is turned off, control the detection circuit to allow direct current to flow, and determine that the aerosol generating product has been received into the cavity or that the aerosol generating product has been removed from the cavity based on the duration until the potential difference across the capacitor reaches a predetermined potential difference threshold, and further control the switching transistor circuit. The aerosol generating device according to claim 6, characterized in that the controller is configured to compare the duration until the potential difference across the capacitor reaches a predetermined potential difference threshold with a predetermined time threshold, and if the duration until the potential difference across the capacitor reaches the predetermined potential difference threshold is greater than the predetermined time threshold, output a second control signal to control and operate the switching transistor circuit, and further activate the heater to perform heating, and if the duration until the potential difference across the capacitor reaches the predetermined potential difference threshold is equal to or less than the predetermined time threshold, control the switching transistor circuit to keep it off. The aerosol generating device according to claim 6, characterized in that the controller is configured to determine a difference between the duration until the potential difference across the capacitor reaches a predetermined potential difference threshold and a predetermined time threshold, and if the difference is equal to or less than the predetermined difference threshold and greater than zero, output a third control signal to control and operate the switching transistor circuit, and further activate the heater to heat, and if the difference is greater than the predetermined difference threshold or the difference is equal to or less than zero, control and keep the switching transistor circuit off. The aerosol generating device according to claim 7 or 8, characterized in that the controller is configured to control the detection circuit to again allow direct current to flow when the heater is in the heating gap, and to determine that the aerosol generating product has been received into the cavity or that the aerosol generating product has been removed from the cavity based on the duration until the potential difference across the capacitor reaches a predetermined potential difference threshold. the controller further comprises a timer;
The aerosol generating device of claim 1, characterized in that the controller is configured to control the flow of direct current to the detection circuit when the timing time of the timer is reached, and to determine that the aerosol generating product has been accepted into the cavity or that the aerosol generating product has been removed from the cavity based on the duration until the potential difference across the capacitor reaches a predetermined potential difference threshold. 1. A method for controlling an aerosol generating device including a cavity, a heater, and a detection circuit including a capacitor connected in series with the heater, comprising:
Controlling the detection circuit so that a direct current flows therethrough;
and determining that the aerosol-generating product has been accepted into the cavity or that the aerosol-generating product has been removed from the cavity based on the duration until the potential difference across the capacitor reaches a predetermined potential difference threshold. The aerosol generating device further includes a timer;
The method comprises:
When controlling the flow of direct current through the detection circuit, controlling a timer to start timing;
acquiring a time count of the timer when a potential difference across the capacitor reaches a predetermined potential difference threshold;
12. The method of claim 11, further comprising determining that the aerosol-generating product has been received into the cavity or determining that the aerosol-generating product has been removed from the cavity based on the time counted by the timer. The aerosol generating device further includes a switching transistor circuit;
The method comprises:
outputting a first control signal to control the switching transistor circuit to be turned off;
controlling the detection circuit so that a direct current flows when the switching transistor circuit is turned off;
12. The method of claim 11, further comprising determining that the aerosol-generating product has been received into the cavity or determining that the aerosol-generating product has been removed from the cavity based on the duration until the potential difference across the capacitor reaches a predetermined potential difference threshold, and further controlling the switching transistor circuit. determining that the aerosol generating product has been admitted to the cavity or that the aerosol generating product has been removed from the cavity based on the duration of time it takes for the potential difference across the capacitor to reach a predetermined potential difference threshold, and further controlling the switching transistor circuit;
comparing a duration until the potential difference across the capacitor reaches a predetermined potential difference threshold with a predetermined time threshold;
when the duration until the potential difference across the capacitor reaches a predetermined potential difference threshold is greater than a predetermined time threshold, outputting a second control signal to control and operate the switching transistor circuit, and further activating the heater to perform heating;
and controlling the switching transistor circuit to remain off if the duration until the voltage difference across the capacitor reaches a predetermined voltage difference threshold is less than or equal to a predetermined time threshold. determining that the aerosol-generating product has been admitted to the cavity or that the aerosol-generating product has been removed from the cavity based on the duration of time it takes for the potential difference across the capacitor to reach a predetermined potential difference threshold,
determining a difference between a duration until a potential difference across the capacitor reaches a predetermined potential difference threshold and a predetermined time threshold;
when the difference is equal to or less than a predetermined difference threshold and is greater than zero, outputting a third control signal to control and operate the switching transistor circuit, and further activating the heater to perform heating;
and controlling the switching transistor circuit to remain off if the difference is greater than a predetermined difference threshold. The aerosol generating device further includes a timer;
The method comprises:
When the timing of the timer is reached, a direct current is controlled to flow through the detection circuit;
12. The method of claim 11, further comprising determining that the aerosol-generating product has been accepted into the cavity or determining that the aerosol-generating product has been removed from the cavity based on the duration of time it takes for the potential difference across the capacitor to reach a predetermined potential difference threshold.