CN120899026A - Aerosol generating device and its control method - Google Patents
Aerosol generating device and its control methodInfo
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- CN120899026A CN120899026A CN202410548310.0A CN202410548310A CN120899026A CN 120899026 A CN120899026 A CN 120899026A CN 202410548310 A CN202410548310 A CN 202410548310A CN 120899026 A CN120899026 A CN 120899026A
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- duty cycle
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- temperature
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Abstract
The application provides an aerosol generating device and a control method thereof, wherein the aerosol generating device comprises a heater, an electric core, a switching circuit and a switching circuit, wherein the switching circuit is electrically connected between the electric core and the heater and comprises at least one switching tube, the control method comprises the steps of controlling the on-off of the switching tube in one or more heating cycles so as to adjust the power provided by the electric core to the heater, so that the temperature of the heater is maintained at a preset target temperature, and adjusting the duty ratio of a pulse width modulation signal output to the switching tube stepwise in the heating cycles, so that the heated temperature gradually approaches the target temperature. The application can lead the duty ratio of the pulse width modulation signal output to the switching tube to change softly, reduce the variation of current and reduce the mechanical vibration amplitude, thereby controlling the noise decibel value generated by the aerosol generating device and improving the use experience of users.
Description
Technical Field
The application relates to the technical field of aerosol generation, in particular to an aerosol generation device and a control method thereof.
Background
Articles such as cigarettes, cigars, etc. burn tobacco during use to produce tobacco smoke. Attempts have been made to provide alternatives to these tobacco-burning articles by releasing the product of the compound without burning. Examples of such products are so-called heated non-combustible products, also called tobacco heating products, or tobacco heating devices, or aerosol-generating devices, which release compounds by heating a material without burning the material. The material may be, for example, tobacco or other non-tobacco products or combinations, such as a blended mixture that may or may not include nicotine.
The existing aerosol generating device is easy to generate mechanical vibration and noise when being heated, so that the experience of a user is poor. For example, when the current flowing through the wire (or other conductor) changes, the magnetic field will also change, and the magnitude of the magnetic field force is proportional to the current, and the wire will displace due to the force applied by the wire in the magnetic field, so that the wire will generate mechanical vibration and noise.
Disclosure of Invention
The application provides an aerosol generating device and a control method thereof, which aim to solve the problem of noise existing in the existing aerosol generating device.
An aspect of the present application provides a control method of an aerosol-generating device, the aerosol-generating device comprising:
a heater for heating the aerosol-forming substrate to generate an aerosol;
The battery cell is used for providing power for the heater;
the switch circuit is electrically connected between the battery core and the heater and comprises at least one switch tube;
the control method comprises the following steps:
In one or more heating cycles, controlling the on-off of the switching tube so as to adjust the power provided by the battery cell to the heater, so that the temperature of the heater is maintained at a preset target temperature;
The duty ratio of the pulse width modulation signal output to the switching tube is stepwise adjusted in the heating cycle so that the heated temperature gradually approaches the target temperature.
Another aspect of the application provides an aerosol-generating device comprising:
a heater for heating the aerosol-forming substrate to generate an aerosol;
The battery cell is used for providing power for the heater;
the switch circuit is electrically connected between the battery core and the heater and comprises at least one switch tube;
And the control unit is configured to control the on-off of the switching tube in one or more heating cycles so as to adjust the power provided by the battery cell to the heater, so that the temperature of the heater is maintained at a preset target temperature, and the duty ratio of a pulse width modulation signal output to the switching tube is adjusted stepwise in the heating cycles so that the heated temperature gradually approaches the target temperature.
According to the aerosol generating device and the control method thereof, the duty ratio of the pulse width modulation signal output to the switching tube is regulated stepwise during the period that the temperature of the heater is maintained to be the target temperature, so that the duty ratio of the pulse width modulation signal output to the switching tube is changed softly, the change amount of current is reduced, the mechanical vibration amplitude is reduced, the noise decibel value generated by the aerosol generating device is controlled, and the use experience of a user is improved.
Drawings
One or more embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings, in which like references indicate similar elements, and in which the figures of the drawings are not to be taken in a limiting sense, unless otherwise indicated.
Fig. 1 is a schematic view of an aerosol-generating device provided by an embodiment of the present application;
FIG. 2 is a schematic diagram of a specific circuit provided by an embodiment of the present application;
FIG. 3 is a schematic diagram of a temperature profile of a heater provided by an embodiment of the present application;
FIG. 4 is a schematic diagram of stepwise duty cycle adjustment provided by an embodiment of the present application;
Fig. 5 is a schematic diagram of a control method of an aerosol-generating device according to an embodiment of the present application;
fig. 6 is a schematic diagram of measured data of an aerosol-generating device according to an embodiment of the present application.
Detailed Description
In order that the application may be readily understood, a more particular description thereof will be rendered by reference to specific embodiments that are illustrated in the appended drawings. It will be understood that when an element is referred to as being "fixed" to another element, it can be directly on the other element or one or more intervening elements may be present 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 the like are used in this specification for illustrative purposes only.
Unless defined otherwise, 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 belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and/or" as used in this specification includes any and all combinations of one or more of the associated listed items.
Fig. 1 is a schematic view of an aerosol-generating device according to an embodiment of the present application.
As shown in fig. 1, the aerosol-generating device comprises:
a chamber a within which the aerosol-generating article B is removably received;
A heater 10, when the aerosol-generating article B is received within the chamber a, the heater 10 being insertable into the aerosol-generating article B for heating to generate an aerosol;
a battery cell 20 for supplying power;
The circuit 30 is disposed between the battery cell 20 and the heater 10. The circuit 30 is used to control the aerosol-generating device, for example, the control battery 20 providing power to the heater 10.
The aerosol-generating article B preferably employs a tobacco-containing material that releases volatile compounds from a matrix upon heating, or may be a non-tobacco material capable of being heated and thereafter adapted for electrically heated smoking. The aerosol-generating article B preferably employs a solid substrate which may comprise one or more of a powder, granules, shredded strips, ribbons or flakes of one or more of vanilla leaf, tobacco leaf, homogenized tobacco, expanded tobacco, or the solid substrate may comprise additional volatile flavour compounds of tobacco or non-tobacco to be released upon heating of the substrate.
The heating mode of the heater 10 includes, but is not limited to, resistance heating, electromagnetic heating, and infrared heating. The shape of the heater 10 includes, but is not limited to, needle-like, pin-like, or flake-like.
It should also be noted that, unlike the example of fig. 1, in other examples, it is also possible that the heater 10 is configured to heat around at least part of the aerosol-generating article B, so-called circumferential heating or peripheral heating, etc.
Fig. 2 shows a schematic diagram of the basic components of one embodiment of the circuit 30.
As shown in fig. 2, the circuit 30 includes:
a first switching tube Q1 positioned between the battery cell 20 (shown as Vbat in the figure) and the heater 10 (shown as R1 in FIG. 2), when the first switching tube Q1 is turned on, the battery cell 20 is caused to supply power to the heater 10;
The sampling resistor R2 is positioned between the second switching tube Q2 and the heater 10. Specifically, a first end (a 1 in the figure) of a sampling resistor R2 is connected with a second switching tube Q2, a second end (b 1 in the figure) of the sampling resistor R2 is connected with a heater 10, the sampling resistor R2 is a standard resistor with a basically constant resistance value, the resistance value range is 0.1mΩ -1000 KΩ, and the sampling resistor R2 is used for being connected in series with the heater 10 when the second switching tube Q2 is conducted, so that a detection loop capable of detecting the voltage of the sampling resistor R2 and the heater 10 through voltage division is formed. Of course, when detection is not required, the second switching tube Q2 is turned off to disconnect the detection circuit.
In the implementation shown in fig. 2, the first end of the heater 10 includes two paths, a first path being connected to the first switching tube Q1 and a second path being used to form a series connection with the sampling resistor R2. The second end of the heater 10 is grounded, i.e. the potential of the second end of the heater 10 is 0.
Further in the implementation shown in fig. 2, the first switching tube Q1 and the second switching tube Q2 are controlled to be turned on and off by the control unit, and the first switching tube Q1 and the second switching tube Q2 are not turned on at the same time. The control unit includes, but is not limited to, a single chip Microcomputer (MCU). When power is required to be supplied to the heater 10, the control unit controls the first switching tube Q1 to be turned on and the second switching tube Q2 to be turned off, so that the battery cell 20 supplies power to the heater 10. When the heating temperature of the heater 10 needs to be detected, the control unit controls the first switching tube Q1 to be turned off and the second switching tube Q2 to be turned on, and the heating temperature can be determined by detecting the relevant electrical characteristics of the loop, the sampling resistor R2, and the heater 10, such as voltage.
The voltage at two ends of the sampling resistor R2 is denoted as V1, the voltage at two ends of the heater 10 is denoted as V2, the voltage at the first end of the sampling resistor R2, namely the voltage at the sampling point a1 in fig. 2, which is the voltage at two ends of the detection loop, is denoted as Va1 in the detection process, and the voltage at the first end of the heater 10, namely the voltage Vb1 at the sampling point b1 in fig. 3, which is sampled by the control unit. Based on the second ground of the heater 10 in fig. 3, the voltage v1=v2 at the sampling point b1 is sampled, and the voltage v1=v1-Vb 1 across the sampling resistor R2 is sampled. Thus, the current resistance of the heater 10 can be determined asThe current temperature of the heater 10 may then be determined based on the TCR calculation formula.
It will be appreciated that in other examples, the real-time temperature of the heater 10 may be detected by a temperature sensor, such as a thermocouple.
Fig. 3 is a schematic diagram of a temperature profile of a heater according to an embodiment of the present application.
As shown in fig. 3, the abscissa T of the temperature curve represents time, and the ordinate T represents temperature.
At time T0, the initial temperature of the heater 10 is T0.
In the example of FIG. 3, the initial temperature is greater than the ambient temperature, in other examples, the initial temperature may be the ambient temperature.
In the time period from T0 to T1, the control unit controls the power of the heater 10 to heat at a preset power, for example, the maximum power is 36W, and at the time T1, the heater 10 is heated to a preset temperature T1. the time period t 0-t 1 is the temperature rising stage in the heating stage of the heater.
The predetermined temperature may be the optimum temperature at which the aerosol-forming substrate in the aerosol-generating article B generates an aerosol, i.e. the temperature at which the aerosol-forming substrate may provide the amount of smoke and the temperature most suitable for user inhalation, with a good mouthfeel. The preset temperature adopted by the embodiment of the application is 150-350 ℃, or 180-350 ℃, or 220-300 ℃, or 220-280 ℃ or 220-260 ℃.
In the time period T1-T2, the control unit controls the power supplied from the battery cell 20 to the heater 10 and controls the heater 10 to be maintained at the preset temperature T1 (220 ℃) for a period of time (i.e., in the time period T1-T2). It should be noted that, in other examples, it is also possible to not set the time period t1 to t 2. the time period t 1-t 2 is the heat preservation stage in the heating stage of the heater.
At time t2, the control unit may output a prompt signal for sucking aerosol, and prompt the user to suck. Specifically, the prompting operation can be performed according to the prompting signal of the inhalable aerosol output by the control unit through the prompting device connected with the control unit. For example, the prompting device is a vibration motor, and the vibration motor prompts a user to suck aerosol according to a prompting signal (including a starting signal for controlling the operation of the vibration motor) of the sucked aerosol output by the control unit. The prompting device is an LED lamp, and the LED lamp is normally on or blinks to prompt a user to pump the aerosol according to a prompting signal of the aerosol which can be pumped and is output by the control unit.
In the time period T2 to T3, after outputting the prompt signal of the smokable aerosol, the control unit controls the power supplied from the battery cell 20 to the heater 10 and controls the temperature of the heater 10 to decrease from T1 to the target temperature T2. Subsequently, the control unit controls the power supplied from the battery cell 20 to the heater 10 to control the heater 10 to be maintained at the target temperature T2.
The value of the time period t 2-t 3 can be 120-360 seconds or the duration of sucking 6-20 ports. the time period t 2-t 3 is the pumping stage in the heating stage of the heater.
Based on the above aerosol-generating device, in one example, the control unit is configured to control the on-off of the switching tube in one or more heating cycles to adjust the power provided by the battery cell to the heater so that the temperature of the heater is maintained at a preset target temperature, and to stepwise adjust the duty cycle of the pulse width modulation signal output to the switching tube in the heating cycles so that the heated temperature approaches the target temperature. .
For example, during the soak period, the power provided by the battery cell to the heater is controlled so that the temperature of the heater is maintained at a preset target temperature T1. During the pumping phase, the power provided by the battery cell to the heater is controlled so that the temperature of the heater is maintained at a preset target temperature T2. The power provided by the battery cell to the heater in the heat preservation stage and the power provided by the battery cell to the heater in the suction stage can be the same or different. In a preferred implementation, the power provided by the electrical core to the heater during the soak period is greater than the power provided by the electrical core to the heater during the pump period.
In the above heating cycle, on/off (on or off) of the switching tube is controlled based on a temperature difference of the heater, thereby adjusting power supplied from the battery cell to the heater so that the temperature of the heater is maintained at a preset target temperature. It is understood that a heating cycle refers to one period of adjusting power based on a temperature difference.
The duty ratio of the pulse width modulation signal output to the switching tube is regulated stepwise in the heating cycle, so that the heated temperature gradually approaches the target temperature, the duty ratio of the pulse width modulation signal output to the switching tube is enabled to be changed softly, the variation of current is reduced, the mechanical vibration amplitude is reduced, the noise decibel value generated by the aerosol generating device is controlled, and the use experience of a user is improved. For example, the duty ratio of the pwm signal output to the switching tube is adjusted each time, and the current variation is 0 to 1a, or 0 to 0.8a, or 0 to 0.6a, or 0 to 0.4a, or 0 to 0.2a, or 0 to 0.1a, or 0 to 0.05a. The current variation can be 0-5A, or 0-4A, or 0-3A, or 0-2A during the whole adjustment period. In this way, the mechanical vibration amplitude can be reduced, and the decibel value of the noise generated by the aerosol-generating device can be controlled to be within a user acceptable range, for example limited to a reference decibel value of 45 bB. As a preferred implementation, the decibel level of noise generated by the aerosol-generating device is also limited to a range acceptable to the user, such as 0dB-32dB,0dB-30dB,0dB-26dB,0dB-20dB or 5dB-20dB, etc.
In an example, the duty cycle of the pulse width modulation signal output to the switching tube is adjusted stepwise, and the adjustment amplitude of each duty cycle may be fixed or may be variable. The adjustment range of each duty cycle is 1% -30%, or 1% -25%, or 5% -25%, or 10% -25%, or 15% -25%.
Taking fig. 4 as an example, fig. 4 is a schematic diagram of increasing the duty ratio of the pulse width modulation signal output to the switching tube in a stepwise manner, wherein the abscissa in the figure is time, and the ordinate is the duty ratio. In the whole adjustment process, the duty ratio of the pulse width modulation signal is adjusted for 8 times, namely, as shown by t 21～t28 in the figure, D 1～D8 is the corresponding duty ratio. Δd in the figure is the adjustment amplitude between the first and second adjustments, and Δd may be fixed or variable. In a preferred embodiment, ΔD is 1% -30%.
In an example, the control unit is configured to determine a real-time temperature of the heater, and to stepwise adjust the duty cycle based on a comparison of the real-time temperature of the heater and the target temperature.
Specifically, the duty cycle is increased stepwise if the real-time temperature of the heater is less than the target temperature, and the duty cycle is decreased stepwise if the real-time temperature of the heater is greater than the target temperature.
In an example, the control unit is configured to determine a current duty cycle of the pulse width modulated signal, and calculate an adjusted duty cycle of the pulse width modulated signal based on the current duty cycle of the pulse width modulated signal and a preset adjustment function.
The preset adjusting function comprises at least one of a linear function, a convex function and a concave function.
Taking the example that the real-time temperature of the heater is less than the target temperature, since the real-time temperature of the heater is less than the target temperature, the duty ratio needs to be increased stepwise. Assuming that the current duty cycle is D cur,Up (N) is a preset adjustment function and the adjusted duty cycle is D set, D set＝Dcur+Up (N), where N is the number of adjustments, n=0, 1,2,3.
In a further implementation, the adjusted duty cycle may be determined to be D set according to an adjustment coefficient D step, where the adjustment coefficient D step is determined by the aerosol-generating device itself, and different aerosol-generating devices have different adjustment coefficients D step, which may be obtained experimentally. The adjusted duty cycle is D set＝Dcur+Up(N)*Dstep.
Similarly, when the real-time temperature of the heater is greater than the target temperature, the adjusted duty ratio may be calculated by the following formula D set＝Dcur +fall (N) or D set＝Dcur+Fall(N)*Dstep. Wherein Fall (N) is a preset adjustment function. It will be appreciated that when Fall (N) is a linear function, then the duty cycle of the pulse width modulated signal output to the switching tube is adjusted stepwise, the amplitude of adjustment of each duty cycle being fixed. When Fall (N) is a convex function or a concave function, for example Fall (N) =sin (n×pi/6), the duty cycle of the pulse width modulation signal output to the switching transistor is adjusted stepwise, and the adjustment amplitude of each duty cycle is changed. The preset adjustment function U p (N) is similar.
In an example, the control unit is configured to, in the step-wise adjustment of the duty cycle, output the duty cycle of the pulse width modulation signal to the switching tube to be the maximum duty cycle if the adjusted duty cycle is greater than or equal to a preset maximum duty cycle, and output the duty cycle of the pulse width modulation signal to the switching tube to be the minimum duty cycle if the adjusted duty cycle is less than or equal to a preset minimum duty cycle.
Assume that the maximum duty cycle is 100% and the minimum duty cycle is 0. And if the adjusted duty ratio is D set or more than 100%, outputting the duty ratio of the pulse width modulation signal to the switching tube to be 100%. And if the adjusted duty ratio is D set or less than or equal to 0, the duty ratio of the pulse width modulation signal output to the switching tube is 0. It is understood that the value of the maximum duty cycle or the minimum duty cycle is not limited to the above case.
Fig. 5 is a schematic diagram of a control method of an aerosol-generating device according to an embodiment of the present application.
The aerosol-generating device may refer to the preceding, the control method comprising:
Step S11, controlling the on-off of the switch tube in one or more heating cycles so as to adjust the power provided by the battery cell to the heater, so that the temperature of the heater is maintained at a preset target temperature;
Step S12, adjusting the duty ratio of the pulse width modulation signal outputted to the switching tube stepwise in the heating cycle so that the heated temperature gradually approaches the target temperature.
In an example, the adjustment range of the duty cycle is 1% -30%.
In an example, the adjustment amplitude of the duty cycle is fixed or variable.
In an example, the control method includes:
Determining a real-time temperature of the heater;
the duty ratio is adjusted stepwise according to the comparison result of the real-time temperature of the heater and the target temperature.
In an example, the control method includes:
The duty cycle is increased stepwise if the real-time temperature of the heater is less than the target temperature, and the duty cycle is decreased stepwise if the real-time temperature of the heater is greater than the target temperature.
In an example, the control method includes:
Determining a current duty cycle of the pulse width modulation signal;
and calculating the duty ratio of the pulse width modulation signal after adjustment according to the current duty ratio of the pulse width modulation signal and a preset adjustment function.
In an example, the preset adjustment function includes at least one of a linear function, a convex function, and a concave function.
In an example, the control method includes:
In the step-type duty cycle adjustment process, if the adjusted duty cycle is greater than or equal to a preset maximum duty cycle, the duty cycle of the pulse width modulation signal output to the switching tube is the maximum duty cycle, and if the adjusted duty cycle is less than or equal to the preset minimum duty cycle, the duty cycle of the pulse width modulation signal output to the switching tube is the minimum duty cycle.
In one example, the heating process of the heater includes a soak phase and a suction phase;
the control method comprises the following steps:
During the soak phase and the pump phase, the power provided by the battery cells to the heater is controlled to be different so that the temperature of the heater is maintained at different target temperatures.
Fig. 6 is a schematic diagram of measured data of an aerosol-generating device according to an embodiment of the present application.
The green line is the duty cycle (time on the abscissa and percentage on the ordinate) of the pulse width modulation signal, the blue line is the target temperature (time on the abscissa and temperature on the ordinate), and the red line is the real-time temperature of the heater (time on the abscissa and temperature on the ordinate). As can be seen from the graph, the duty cycle of the pulse width modulation signal is stepwise variable, and the real-time temperature of the heater fluctuates up and down at the target temperature, with a fluctuation range of about 2-10 ℃.
It should be noted that while the present application has been illustrated in the drawings and described in connection with the preferred embodiments thereof, it is to be understood that the application may be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but are to be construed as providing a full breadth of the disclosure. The above technical features are further combined with each other to form various embodiments which are not listed above and are all considered as the scope of the present application described in the specification, further, the improvement or transformation can be carried out by the person skilled in the art according to the above description, and all the improvements and transformation shall fall within the protection scope of the appended claims.
Claims (11)
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410548310.0A CN120899026A (en) | 2024-05-06 | 2024-05-06 | Aerosol generating device and its control method |
| PCT/CN2025/090185 WO2025232524A1 (en) | 2024-05-06 | 2025-04-21 | Aerosol generating device and control method therefor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202410548310.0A CN120899026A (en) | 2024-05-06 | 2024-05-06 | Aerosol generating device and its control method |
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| CN202410548310.0A Pending CN120899026A (en) | 2024-05-06 | 2024-05-06 | Aerosol generating device and its control method |
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| WO (1) | WO2025232524A1 (en) |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| TWI595340B (en) * | 2012-09-11 | 2017-08-11 | 菲利浦莫里斯製品股份有限公司 | Device and method for controlling an electrical heating element, aerosol gererating system, a computer program which, when run on programmable electric circuitry for electrically operated gererating device, causes the electric circuitry to perform the me |
| HK1246110B (en) * | 2015-04-15 | 2020-04-03 | Philip Morris Products S.A. | Device and method for controlling an electrical heater to limit temperature according to desired temperature profile over time |
| CN110859331B (en) * | 2018-08-20 | 2022-04-08 | 常州市派腾电子技术服务有限公司 | Temperature control method of electronic cigarette, electronic cigarette and computer storage medium |
| KR102306051B1 (en) * | 2018-11-16 | 2021-09-28 | 주식회사 케이티앤지 | Aerosol generating apparatus and method for controling aerosol generating apparatus |
| JP2021193950A (en) * | 2020-06-16 | 2021-12-27 | 暮らし創研株式会社 | Smoking tool |
| CN112403405B (en) * | 2020-10-15 | 2023-01-03 | 深圳麦克韦尔科技有限公司 | Aerosol generating device, aerosol generating method, control circuit and storage medium |
| CN116210982A (en) * | 2023-03-31 | 2023-06-06 | 上海烟草集团有限责任公司 | Heating circuit, heating control method and aerosol generating device |
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