Electronic cigarette and microcontroller and control circuit for electronic cigarette

Abstract

The invention discloses an electronic cigarette and a microcontroller and a control circuit for the electronic cigarette, and particularly relates to the technical field of electronic cigarettes, the microcontroller stores a first corresponding relation between a capacitance value change parameter and cigarette lighting power, and obtains a current capacitance value change parameter based on data obtained by a capacitance value of a capacitive microphone in the electronic cigarette; determining the target cigarette lighting power of the electronic cigarette in the first corresponding relation; wherein the first corresponding relation is determined based on a second corresponding relation between the capacitance value change parameter and the suction force and a third corresponding relation between the suction force and the cigarette lighting power, and the second corresponding relation is nonlinear. According to the embodiment of the invention, the effect that the cigarette lighting power changes along with the smoking intensity can be simulated, the problem that the cigarette lighting control precision is not high due to the limitation of the material of the capacitive microphone can be improved or solved, the actual smoking requirement of a user is matched, and the real smoking effect is simulated.

Description

Technical Field

[0001] The present invention relates to the technical field of electronic cigarettes, and in particular to a microcontroller, a control circuit and an electronic cigarette for an electronic cigarette. Background Art

[0002] As an alternative to cigarettes, e-cigarettes are becoming increasingly popular in the market because they are safe, convenient, healthy and environmentally friendly to a certain extent.

[0003] When the airflow sensor in the electronic cigarette senses the airflow when the user is smoking, it continuously triggers the airflow sensing switch to connect the heating circuit in the electronic cigarette during the user's inhalation time. After the heating circuit is turned on, the e-liquid is atomized. This method can only control the lighting time according to the user's inhalation time and the lighting power is fixed. The control waveform is as follows Figure 1 As shown, a high level indicates that the user smokes, and a low level indicates that the user does not smoke, which results in a poor user experience. Summary of the Invention

[0004] The present invention provides a microcontroller, a control circuit, and an electronic cigarette for an electronic cigarette, aiming to overcome the above-mentioned technical problems, simulate the effect of cigarette ignition power changing with the intensity of smoking, and improve or solve the problem of low cigarette ignition control accuracy caused by the limitations of the materials of the capacitive microphone itself, so as to match the actual smoking needs of users and simulate the real smoking effect.

[0005] In order to solve the above problems, the present invention discloses, from a first aspect, a microcontroller for an electronic cigarette, comprising:

[0006] A storage module, used for storing a first correspondence between a capacitance value variation parameter and a cigarette lighting power;

[0007] A communication module, used to receive data based on the capacitance value of the capacitive microphone in the electronic cigarette;

[0008] a processing module, configured to obtain a current capacitance value change parameter based on the data, and determine a target lighting power of the electronic cigarette according to the first corresponding relationship and the current capacitance value change parameter;

[0009] The first corresponding relationship is determined based on the second corresponding relationship between the capacitance value change parameter and the suction force and the third corresponding relationship between the suction force and the cigarette lighting power, and the second corresponding relationship is nonlinear.

[0010] In one embodiment of the present invention, the storage module stores multiple groups of first correspondences, and the reference capacitance values ​​of the capacitive microphones corresponding to different groups of first correspondences are different; the processing module is further used to obtain a second parameter used to characterize the reference capacitance value based on the data, and determine a target first correspondence corresponding to the second parameter in the multiple groups of first correspondences, and then determine a target cigarette ignition power corresponding to the current capacitance value change parameter in the target first correspondence.

[0011] In one embodiment of the present invention, the second corresponding relationship is represented by a relationship curve between the capacitance change parameter and the suction force; in the relationship curve, the absolute value increase ratio of the capacitance change parameter gradually decreases as the suction force increases.

[0012] In one embodiment of the present invention, in the relationship curve, the absolute value of the capacitance value change parameter is reflected in the vertical coordinate, the suction force is reflected in the horizontal coordinate, and the slope of the relationship curve gradually decreases as the horizontal coordinate increases; or, in the relationship curve, the absolute value of the capacitance value change parameter is reflected in the horizontal coordinate, the suction force is reflected in the vertical coordinate, and the slope of the relationship curve gradually increases as the horizontal coordinate increases.

[0013] In one embodiment of the present invention, the capacitance change parameter is a capacitance change amount or a capacitance change rate.

[0014] In one embodiment of the present invention, the capacitance change parameter is a capacitance change rate K; wherein K = (Nt-N0) / N0 or K = |Nt-N0| / N0 or K = (Nt-N0) / Nt or K = |Nt-N0| / Nt, Nt represents the real-time capacitance value of the capacitive microphone, and N0 represents the reference capacitance value of the capacitive microphone;

[0015] The data include Nt and N0; or,

[0016] The data includes A and N0, where A is the difference between Nt and N0; or

[0017] The data includes A and Nt, where A is the difference between Nt-N0; or,

[0018] Data include K and N0; or,

[0019] The data include K and Nt.

[0020] In one embodiment of the present invention, the relationship curve includes multiple segments, and different segments correspond to different cigarette ignition powers.

[0021] In one embodiment of the present invention, the communication module is further configured to receive the airflow direction;

[0022] When the airflow direction is the inhalation direction, the processing module determines the target cigarette lighting power to be output according to the first corresponding relationship and the current capacitance value change parameter;

[0023] When the airflow direction is the exhalation direction, the processing module controls the electronic cigarette not to light a cigarette or to stop lighting a cigarette.

[0024] From a second aspect, the present invention further discloses a control circuit for an electronic cigarette, comprising:

[0025] A capacitive microphone, a switch microphone chip connected to the capacitive microphone, and a microcontroller as described in the first aspect of the embodiment of the present invention; the switch microphone chip transmits data based on the capacitance value of the capacitive microphone to the microcontroller via a data packet.

[0026] In one embodiment of the present invention, the microcontroller and the switch microphone chip exchange information via data packets; the data packet sent by the switch microphone chip to the microcontroller includes, in sequence, a communication identification segment, a data segment, and an end status segment; the data packet sent by the microcontroller to the switch microphone chip includes, in sequence, a communication identification segment, a read / write segment, a data segment, and an end status segment, wherein the read / write segment is used to indicate whether the execution task of the data packet is a read operation or a write operation.

[0027] From a third aspect, the present invention further discloses an electronic cigarette, comprising the control circuit for the electronic cigarette as described in the second aspect of the embodiment of the present invention.

[0028] The embodiments of the present invention include the following advantages:

[0029] An embodiment of the present invention provides a microcontroller for an electronic cigarette. The microcontroller determines a target lighting power based on a first correspondence between a capacitance change parameter and lighting power and a current capacitance change parameter. Since the first correspondence between the capacitance change parameter and lighting power is determined based on a second correspondence between the capacitance change parameter and suction force and a third correspondence between suction force and lighting power, and since the second correspondence is nonlinear, the microcontroller actually restores the suction force corresponding to the current capacitance change parameter during the process of determining the target lighting power. The resulting target lighting power is actually determined based on the restored suction force. This improves or resolves the problem of the diaphragm deformation and airflow intensity (the suction force when the user smokes) not being linearly related due to limitations of the material (diaphragm) of the detection capacitor used to detect airflow. This effectively solves the problem of unsatisfactory smoking caused by the diaphragm deformation not keeping up with the suction force in the prior art. Compared with the prior art, the microcontroller can not only simulate the effect of the lighting power changing with the smoking intensity, but also achieve refined control of electronic cigarette atomization, simulating the effect of real smoking. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention.

[0031] Figure 1 This is a schematic diagram of the control waveform of an existing electronic cigarette;

[0032] Figure 2 It is a waveform diagram of linear regulation of cigarette lighting power;

[0033] Figure 3 This is a schematic structural diagram of a microcontroller for an electronic cigarette according to an embodiment of the present invention;

[0034] Figure 4 The relationship curve of the embodiment of the present invention is shown as follows: Figure 1 ;

[0035] Figure 5 The relationship curve of the embodiment of the present invention is shown as follows: Figure 2 ;

[0036] Figure 6 2 is a schematic diagram of a third correspondence relationship between suction force and cigarette lighting power according to an embodiment of the present invention;

[0037] Figure 7 is a schematic diagram of a control circuit for an electronic cigarette according to an embodiment of the present invention;

[0038] Figure 8 is a schematic diagram of communication between a microcontroller and a control chip according to an embodiment of the present invention;

[0039] Figure 9 Schematic diagram of an electronic cigarette according to an embodiment of the present invention. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0041] Hereinafter, the terms "second," "first," etc., are used for descriptive convenience only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature qualified as "second," "first," etc., may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0042] In the embodiments of the present invention, unless otherwise clearly specified or limited, the term "connection" should be understood in a broad sense, and may refer to a direct electrical connection or an indirect electrical connection through an intermediate medium.

[0043] In the embodiments of the present invention, "and / or" describes the association relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A exists alone, A and B exist simultaneously, and B exists alone. A and B can be singular or plural. The character " / " generally indicates that the associated objects are in an "or" relationship.

[0044] In order to improve the user's smoking experience, the relevant technology proposes a solution to detect the user's suction force and then linearly adjust the cigarette lighting power according to the detected suction force. The output duty cycle is as follows: Figure 2 When the suction force detected is small ( Figure 2 The suction force 1 part in the output waveform is also small, such as the duty cycle 1 part; as the user smokes, the detected suction force increases ( Figure 2 The duty cycle of the output waveform is large, such as the duty cycle 2 part; when the user stops smoking, the airflow decreases or disappears and does not reach the internally set threshold range, and the duty cycle is 0.

[0045] However, the inventors discovered that the aforementioned linear relationship is overly idealized. The reason for this is that manufacturers commonly use capacitors as airflow sensors (commonly known as capacitive microphones). These capacitors consist of a diaphragm, a gasket, and an electrode plate. The diaphragm and electrode plate are arranged in parallel, and the spacing or contact area between the diaphragm and the electrode plate changes with airflow intensity, causing the capacitance value output by the capacitor microphone to change. Therefore, the change in capacitance output by a capacitive microphone can be used to characterize the suction force of a user smoking. However, the inventors discovered that the diaphragm deformation of a capacitive microphone is not linearly related to the suction force of a user smoking. In the field of electronic cigarettes, suction force is measured as the intensity of airflow flowing to a capacitive microphone. During the initial smoking phase, the diaphragm deformation increases with increasing suction force and decreases with decreasing suction force, with the two changing at similar rates. However, as suction force increases, or as smoking time at the same suction force increases, or as environmental influences occur, the diaphragm deformation becomes minimal or unstable, and the capacitance value also increases minimally. For example, initially, if the suction force increases by 10%, the capacitance change also increases by 10%. As the diaphragm deformation increases, the suction force may increase by 10%, while the capacitance change increases by only 5%. As the diaphragm deformation continues to increase, the suction force may increase by 10%, while the capacitance change increases by only 1% or even no increase. This results in the cigarette lighting power control that linearly outputs the target duty cycle signal based on the detected suction force, which cannot actually meet the user's needs when smoking with high suction force. It is often easy to feel that the suction force is strong, but the atomization effect is not keeping up (common saying: smoking is not enjoyable), which cannot meet the user's smoking needs and cannot simulate the real smoking effect.

[0046] In view of this, the embodiment of the present invention discloses a microcontroller for electronic cigarettes, referring to Figure 3The electronic cigarette comprises a storage module, a communication module, and a processing module. The storage module is configured to store a first correspondence between a capacitance value variation parameter and a cigarette lighting power; the communication module is configured to receive data based on the capacitance value of a capacitive microphone in the electronic cigarette; and the processing module is configured to obtain a current capacitance value variation parameter based on the data and determine a target cigarette lighting power of the electronic cigarette based on the first correspondence and the current capacitance value variation parameter. The first correspondence is determined based on a second correspondence between the capacitance value variation parameter and suction force, and a third correspondence between suction force and cigarette lighting power, and the second correspondence is nonlinear.

[0047] In an embodiment of the present invention, since the first correspondence between the capacitance value change parameter and the lighting power is determined based on the second correspondence between the capacitance value change parameter and the suction force and the third correspondence between the suction force and the lighting power, and the second correspondence is nonlinear, the microcontroller actually completes the restoration of the suction force actually corresponding to the current capacitance value change parameter in the process of determining the target lighting power based on the first correspondence and the current capacitance value change parameter. The target lighting power ultimately obtained is actually determined based on the restored suction force. This improves or solves the problem that the diaphragm deformation and the airflow intensity (the suction force when the user smokes) are not linearly related due to the limitations of the material (diaphragm) of the detection capacitor used to detect the airflow, and can effectively solve the problem in the prior art that the diaphragm deformation cannot keep up with the suction force, resulting in a lack of smoking pleasure. Compared with the prior art, the embodiment of the present invention can not only simulate the effect of the lighting power changing with the smoking intensity, but also achieve refined control of the electronic cigarette atomization and simulate the effect of real smoking.

[0048] A nonlinear relationship is used to describe a set of physical variables in which an initial change in one variable causes disproportionate changes in that variable or other variables. In other words, the rate of change between the variables is not constant. In the present invention, the second correspondence between the capacitance change parameter and suction force can be obtained based on user smoking data collection and extensive testing. This testing process not only considers the relationship between diaphragm deformation and airflow intensity, but also factors such as the baseline capacitance value of the capacitive microphone, ultimately obtaining the nonlinear relationship referred to in the embodiments of the present invention. The specific testing method is not limited in this invention.

[0049] It is worth noting that the microcontroller, also known as MCU, has a much higher main frequency than the switch microphone chip, so its processing speed is faster. Compared with the existing technology that uses the switch microphone chip to output a duty cycle signal to control cigarette lighting, the embodiment of the present invention uses the MCU to parse data to obtain the current capacitance value change parameter, and calculates the target cigarette lighting power of the electronic cigarette based on the first corresponding relationship and the current capacitance value change parameter, and thus outputs control according to the target cigarette lighting power, so that the atomization response time is shorter and the control efficiency is higher.

[0050] After the microcontroller of the present invention determines the target ignition power of the electronic cigarette, the specific ignition power control method can be achieved through the duty cycle, or by controlling the current of the heating wire in the heating circuit or other methods, which is not limited by the present invention.

[0051] In an embodiment of the present invention, the microcontroller receives data based on the capacitance value of the capacitive microphone in the electronic cigarette, wherein the capacitance value change parameter can be the capacitance value change amount or the capacitance value change rate.

[0052] Preferably, the capacitance change parameter is the capacitance change rate K. Compared to transmitting the capacitance change amount, transmitting the capacitance change rate K can reduce the amount of transmission, which is beneficial for receiving more current capacitance change rates in the same time, forming more control points, and facilitating refined control. Accordingly, the storage module in the microcontroller stores the first correspondence between the capacitance change rate K and the cigarette ignition power. The specific manifestation of the first correspondence in the storage module can be a direct correspondence between the capacitance change rate K and the cigarette ignition power, or an indirect correspondence between the capacitance change rate K and the cigarette ignition power.

[0053] A direct correspondence refers to a mapping table or function relationship between the capacitance change rate K and the cigarette ignition power, stored directly in the storage module. This mapping table or function relationship is the first correspondence relationship. This mapping table or function relationship is calculated based on the second correspondence relationship between the capacitance change parameter and suction force, and the third correspondence relationship between suction force and cigarette ignition power. In this case, after the processing module obtains the current capacitance change parameter, it can directly determine the target cigarette ignition power corresponding to the current capacitance change parameter from this first correspondence relationship.

[0054] An indirect correspondence refers to a storage module that stores a second correspondence between the capacitance change parameter and suction force, and a third correspondence between suction force and cigarette lighting power. For example, a mapping relationship table or function relationship between the capacitance change rate K and suction force (the second correspondence relationship) is stored, and a mapping relationship table or function relationship between suction force and cigarette lighting power (the third correspondence relationship) is stored. In this case, after the processing module obtains the current capacitance change parameter, it first determines the target suction force corresponding to the current capacitance change parameter in the second correspondence relationship, and then determines the target cigarette lighting power corresponding to the target suction force in the third correspondence relationship.

[0055] The present invention does not limit whether the capacitance value change rate K corresponds directly or indirectly to the cigarette ignition power.

[0056] In the embodiment of the present invention, the calculation formula of the capacitance change rate K can be one of the following four:

[0057] K = (Nt - N0) / N0 (Formula 1);

[0058] K=|Nt-N0| / N0 (Formula 2);

[0059] K = (Nt - N0) / Nt (Formula 3);

[0060] K = |Nt-N0| / Nt (Formula 4).

[0061] Here, Nt represents the real-time capacitance of the capacitive microphone, and N0 represents its baseline capacitance. The real-time capacitance changes with airflow during smoking, while the baseline capacitance is typically generated or determined when not smoking. Since Nt represents the real-time capacitance of the capacitive microphone, and N0 represents the baseline capacitance, it can be understood that, using Formula 1 as an example, K = (Nt - N0) / N0 is essentially equal to (Ct - C0) / C0, where C0 is the baseline capacitance and Ct is the real-time capacitance. The same applies to Formulas 2 through 4.

[0062] The data received by the communication module that can be used to determine the current capacitance value change rate can also be expressed in multiple forms: Example 1, the data includes Nt and N0; or, Example 2, the data includes A and N0, where A is the difference between Nt-N0, also known as the capacitance value change; or, Example 3, the data includes A and Nt, where A is the difference between Nt-N0; or, Example 4, the data includes K and N0; or, Example 5, the data includes K and Nt. By parsing the data of Example 4 or Example 5, the communication module can directly obtain the current capacitance value change rate K and transmit it to the processing module; and for Examples 1-3, the communication module parses the data and transmits it to the processing module, and the processing module can also calculate the current capacitance value change rate K through the corresponding above formula.

[0063] In the microcontroller of the embodiment of the invention, the first correspondence stored in the storage module can be a set. For example, the capacitance change parameter is the capacitance change rate K, and the storage module stores a first correspondence between the capacitance change parameter and the lighting power. The communication module is configured to receive data based on the capacitance of the capacitive microphone in the electronic cigarette. The processing module obtains the current capacitance change rate K based on the data and determines the target lighting power corresponding to the current capacitance change parameter from the first correspondence.

[0064] Furthermore, the baseline capacitance value of a capacitive microphone may be updated due to environmental influences such as temperature, humidity, and pressure, as well as the influence of the update strategy, or the baseline capacitance value may be different for different capacitive microphones. Optionally, in one embodiment of the present invention, the storage module stores multiple sets of first correspondences between capacitance value change rate and cigarette ignition power, with different sets of first correspondences corresponding to different capacitive microphones having different baseline capacitance values. This testing process can not only consider the relationship between diaphragm deformation and airflow intensity, but also factors such as the baseline capacitance value of the capacitive microphone. Each set of first correspondences can be obtained through data testing, training, and analysis while its corresponding baseline capacitance value is fixed. Taking the capacitance value change parameter as the capacitance value change rate K as an example, according to any of Formulas 1-4, the processing module is further configured to obtain a second parameter representing the baseline capacitance value based on the data. The second parameter can specifically be the aforementioned N0. After obtaining the second parameter, the processing module can first determine a target first correspondence corresponding to the second parameter from the multiple sets of first correspondences, and then determine the target cigarette ignition power corresponding to the current capacitance value change rate K from the target first correspondences. The microcontroller controls the atomization of the electronic cigarette based on the target cigarette ignition power obtained in the embodiment of the present invention, which can achieve more refined smoking control and greatly improve the user experience.

[0065] In various embodiments of the present invention, regardless of whether the first correspondence stored in the storage module is one group or multiple groups, since the first correspondence is determined based on the second correspondence between the capacitance value change parameter and the suction force and the third correspondence between the suction force and the cigarette lighting power, the second correspondence is nonlinear. The second correspondence can be characterized as a relationship curve between the capacitance value change parameter and the suction force. The relationship curve is a continuous quantity in mathematics, and its corresponding function value is all the values ​​in a certain interval on the real axis. Therefore, there will be countless correspondences between the capacitance value change parameter and the suction force on the relationship curve. The processing module can theoretically output countless target suction forces to control the atomization of the electronic cigarette. The control granularity is very small, and it can basically achieve infinite adjustment of the atomization amount of the electronic cigarette and adaptive suction force.

[0066] In this relationship curve, the absolute value increase rate of the capacitance change parameter gradually decreases as the suction force increases. That is, in the initial stage of smoking, the capacitance change parameter and the change in suction force are basically synchronized. As the suction force increases, the increase rate of the capacitance change parameter decreases, which is consistent with the relationship between the change in capacitance value and the change in suction force during actual smoking.

[0067] Taking the capacitance change parameter as the capacitance change rate K as an example, optionally, the second corresponding relationship is represented by a relationship curve between the capacitance change rate K and the suction force. In terms of the representation of the relationship curve on the coordinate axis, it can be expressed in the following ways:

[0068] Method 1: The absolute value of the capacitance change rate is reflected on the ordinate, and the suction force is reflected on the abscissa. The slope of the relationship curve gradually decreases as the abscissa increases.

[0069] Optionally, the first correspondence stored in the storage module is a group, under which the first correspondence is determined based on the second correspondence between the capacitance value change parameter and the suction force and the third correspondence between the suction force and the cigarette lighting power, and the second correspondence is represented by a curve of the relationship between the capacitance value change parameter and the suction force. In the curve, Figure 4 As shown, the absolute value of the capacitance change rate K is the ordinate, the suction force is reflected in the abscissa, and the slope of the relationship curve gradually decreases as the abscissa increases.

[0070] Optionally, the storage module stores multiple groups of first correspondences, each group of first correspondences is determined based on the second correspondence between the capacitance value change parameter and the suction force and the third correspondence between the suction force and the cigarette lighting power, wherein, under each group of first correspondences, the second correspondence is characterized by a curve of the relationship between the absolute value of the capacitance value change rate and the function of the second parameter corresponding to the suction force, and the second parameter can specifically be the aforementioned N0. Figure 5 As shown, different relationship curves correspond to different N0. Figure 5 N0_1, N0_2, and N0_3 correspond to different relationship curves. In each relationship curve, the absolute value of the capacitance change rate and the function of N0 are reflected in the vertical axis, and the suction force is reflected in the horizontal axis. The slope of the relationship curve gradually decreases as the horizontal axis increases.

[0071] Method 2: The absolute value of the capacitance change rate is reflected on the horizontal axis, and the suction force is reflected on the vertical axis. The slope of the relationship curve gradually increases as the horizontal axis increases.

[0072] Optionally, the storage module stores a first correspondence as a set, wherein the first correspondence is determined based on a second correspondence between the capacitance change parameter and suction force, and a third correspondence between suction force and cigarette lighting power, and the second correspondence is represented by a curve showing a relationship between the capacitance change parameter and suction force. In this curve (not shown), the absolute value of the capacitance change rate is represented on the horizontal axis, the suction force is represented on the vertical axis, and the slope of the curve increases gradually as the horizontal axis increases.

[0073] Optionally, the storage module stores multiple groups of first correspondences, and each group of first correspondences is determined based on the second correspondence between the capacitance value change parameter and the suction force and the third correspondence between the suction force and the cigarette lighting power. In each group of first correspondences, the second correspondence is characterized by a relationship curve of the absolute value of the capacitance value change rate and the function of the second parameter corresponding to the suction force. The second parameter can specifically be the aforementioned N0. Different relationship curves correspond to different N0s. In each relationship curve (not shown in the figure), the absolute value of the capacitance value change rate and the function of the second parameter are the horizontal coordinates, and the suction force is the vertical coordinate. The slope of the relationship curve gradually increases with the increase of the horizontal coordinate.

[0074] In the embodiment of the present invention, the third correspondence between suction force and cigarette lighting power can be expressed by a linear relationship. Generally, suction force is linearly correlated with cigarette lighting power, that is, the greater the suction force, the greater the cigarette lighting power, and the smaller the suction force, the smaller the cigarette lighting power. Different cigarette lighting power is reflected in different atomization amounts, and the cigarette lighting power determines the atomization amount. When the cigarette lighting power is large, the atomization amount is large. The third correspondence between suction force and cigarette lighting power can of course also be expressed by the above-mentioned relationship curve, such as Figure 6 As shown, the relationship curve includes multiple segments. That is, the third correspondence between suction force and cigarette ignition power is reflected in multiple segments on the relationship curve, and different segments correspond to different cigarette ignition powers. For example, the first segment of the curve (indicated by L1 in the figure) corresponds to a cigarette ignition power of 10W, the second segment of the curve (indicated by L2 in the figure) corresponds to a cigarette ignition power of 12W, the third segment of the curve (indicated by L3 in the figure) corresponds to a cigarette ignition power of 15W, the fourth segment of the curve (indicated by L4 in the figure) corresponds to a cigarette ignition power of 18W, and the fifth segment of the curve (indicated by L5 in the figure) corresponds to a cigarette ignition power of 21W.

[0075] From the above relationship curves, it can be seen that the absolute value of the capacitance change rate gradually decreases with the increase of suction force, which is reflected in the change of the slope of the relationship curve. It is shown that in the initial stage of smoking, the capacitance change rate and the change of suction force are basically synchronized. As the suction force increases, the capacitance change rate changes less and less, which is consistent with the relationship between the change of capacitance value and suction force during actual smoking. It should be noted that due to reasons such as drawing level and drawing tools, there may be some errors in the shape of this relationship curve and the actual curve. Figure 4-6 The drawn curve is only a schematic illustration and should not limit the trend of the relationship curve of the present invention.

[0076] The direction of airflow during smoking may change, such as changing from inhalation to blowing, or from blowing to inhalation. In an embodiment of the present invention, the data received by the microcontroller may also include the airflow direction, and the specific communication module is also used to receive the airflow direction. Corresponding to different airflow directions, the processing module of the embodiment of the present invention has different processing logic. Among them, when the airflow direction is the inhalation direction, the processing module determines the target cigarette lighting power to be output based on the first corresponding relationship and the current capacitance value change parameter. When the airflow direction is the exhalation direction, the processing module controls the electronic cigarette not to light up or to stop lighting up. This method is suitable for scenarios where the user blows at the beginning of smoking. Of course, when the airflow direction is the exhalation direction, the processing module can also control the electronic cigarette to stop atomizing. This method is suitable for scenarios where the user inhales first and then exhales during the smoking process.

[0077] The embodiment of the present invention also discloses a control circuit for an electronic cigarette, referring to Figure 7 , comprising: a capacitive microphone, a switch microphone chip connected to the capacitive microphone, and a microcontroller disclosed in an embodiment of the present invention;

[0078] The switch microphone chip transmits data based on the capacitance of the capacitive microphone to a microcontroller via a data packet. The microcontroller includes a storage module, a communication module, and a processing module. The storage module is used to store a first correspondence between a capacitance value change parameter and a cigarette lighting power. The communication module is used to receive data based on the capacitance of the capacitive microphone in the electronic cigarette. The processing module is used to obtain the current capacitance value change parameter based on the data, and determine the target cigarette lighting power of the electronic cigarette based on the first correspondence and the current capacitance value change parameter. The first correspondence is determined based on a second correspondence between the capacitance value change parameter and suction force, and a third correspondence between suction force and cigarette lighting power. The second correspondence is nonlinear. For explanations of the microcontroller including the storage module, the communication module, and the processing module, as well as related explanations of the processing logic, please refer to the previous text and will not be elaborated here.

[0079] In an embodiment of the present invention, the microcontroller and control chip communicate using a digital protocol. Specifically, the switch microphone chip and microcontroller exchange information via data packets. This communication method is faster than duty cycle (PWM) communication between the switch microphone chip and microcontroller and is less susceptible to data distortion. Furthermore, both data processing and atomization control are performed by the microcontroller. Compared to existing methods that rely on a switch microphone chip outputting a duty cycle signal for atomization control, the present invention achieves a shorter atomization response time and higher control efficiency.

[0080] refer to Figure 8In an embodiment of the present invention, the data packet sent by the switch microphone chip to the microcontroller includes a communication identification segment, a data segment, and an end status segment in sequence; the data packet sent by the microcontroller to the switch microphone chip includes a communication identification segment, a read / write segment, a data segment, and an end status segment in sequence, wherein the read / write segment is used to indicate whether the execution task of the data packet is a read operation or a write operation.

[0081] Optional, continue to refer to Figure 8 The switch microphone chip and the microcontroller can communicate via a single signal line. Specifically, the switch microphone chip and the microcontroller can communicate using a single-wire protocol in half-duplex mode, simplifying the wiring between the switch microphone chip and the microcontroller and saving costs. The present invention defines the priority of the single-wire protocol in half-duplex communication using data packets.

[0082] Optional, such as Figure 8 As shown, the communication identification segment in the data packet sent by the switch microphone chip includes a blank state segment 1 and an arbitration segment, while the communication identification segment in the data packet sent by the microcontroller includes a blank state segment 2. The length of blank state segment 2 is greater than the sum of the lengths of blank state segment 1 and the arbitration segment. Because the blank state segment 2 in the data packet sent by the microcontroller is longer, based on the "strong 0 weak 1" bus design logic, this method gives the microcontroller higher priority. The high level of the arbitration segment sent by the switch microphone chip is overwritten by the low level of blank state segment 2 sent by the microcontroller. Therefore, the switch microphone chip can detect the bus arbitration result, stop sending data, and switch to receiving the data currently being sent by the microcontroller.

[0083] Optionally, the communication identification segment in the data packet sent by the switch microphone chip includes a blank state segment 1, and the communication identification segment in the data packet sent by the microcontroller includes a blank state segment 2 and an arbitration segment; the length of the blank state segment 1 is greater than the sum of the lengths of the blank state segment 2 and the arbitration segment. When the switch microphone chip and the microcontroller initiate communication simultaneously, based on the same "strong 0 weak 1" bus design logic, the switch microphone chip has higher communication priority than the microcontroller. This method defines the switch microphone chip's communication priority over the microcontroller, which is more suitable for the application scenario of e-cigarettes, prioritizes the user's smoking needs, and ensures timely smoking control.

[0084] Among them, Figure 8 As shown, in a data packet, the blank state segment can be specifically designed to be low level, that is, the blank state segment 1 and the blank state segment 2 are both low level, the arbitration segment includes high level and low level with different duty cycles, the end state segment is high level, and the idle segment is high level.

[0085] like Figure 7 As shown, the control circuit for the electronic cigarette further includes a heating circuit. The microcontroller is connected to a heating switch in the heating circuit. The microcontroller can output the target cigarette lighting power in a PWM manner to control the heating switch.

[0086] Based on the same inventive concept, the embodiment of the present invention further discloses an electronic cigarette, Figure 9 , including the electronic cigarette control circuit described in the embodiment of the present invention. For explanations of the electronic cigarette microcontroller and the electronic cigarette control circuit described in the embodiment of the present invention, please refer to the previous text and will not be elaborated on here. The electronic cigarette of the embodiment of the present invention can simulate the effect of the ignition power changing with the intensity of the puff, and improve or solve the problem of low ignition control accuracy caused by the limitations of the material of the capacitive microphone itself, matching the actual smoking needs of users and simulating the effect of real smoking.

[0087] The technical solutions provided by the present invention have been described in detail above. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is intended only to facilitate understanding of the present invention, and the contents of this specification should not be construed as limiting the present invention. Furthermore, those skilled in the art will appreciate that various modifications may be made to the specific implementation methods and scope of application according to the present invention. It is not necessary and impossible to exhaustively enumerate all implementation methods herein, and any obvious variations or modifications derived therefrom remain within the scope of protection of the present invention.

Claims

1. A microcontroller for an electronic cigarette, characterized in that: include: A storage module, used for storing a first correspondence between a capacitance value variation parameter and a cigarette lighting power; A communication module, configured to receive data based on the capacitance value of the capacitive microphone in the electronic cigarette; a processing module, configured to obtain a current capacitance value change parameter based on the data, and determine a target lighting power of the electronic cigarette according to the first corresponding relationship and the current capacitance value change parameter; The first corresponding relationship is determined based on the second corresponding relationship between the capacitance value change parameter and the suction force and the third corresponding relationship between the suction force and the cigarette lighting power, and the second corresponding relationship is nonlinear.

2. The microcontroller for electronic cigarette according to claim 1, characterized in that: The storage module stores a plurality of groups of first correspondences, and the first correspondences of different groups correspond to different reference capacitance values ​​of the capacitive microphones; The processing module is further configured to obtain a second parameter characterizing the reference capacitance value based on the data, determine a target first correspondence corresponding to the second parameter in a plurality of first correspondences, and then determine a target cigarette ignition power corresponding to the current capacitance value change parameter in the target first correspondence.

3. The microcontroller for electronic cigarette according to claim 1, characterized in that: The second corresponding relationship is represented by a curve showing a relationship between a capacitance value variation parameter and a suction force; In the relationship curve, the absolute value increase ratio of the capacitance change parameter gradually decreases as the suction force increases.

4. The microcontroller for electronic cigarette according to claim 3, characterized in that: In the relationship curve, the absolute value of the capacitance change parameter is represented on the ordinate, and the suction force is represented on the abscissa. The slope of the relationship curve gradually decreases as the abscissa increases. Alternatively, in the relationship curve, the absolute value of the capacitance change parameter is represented on the horizontal axis, the suction force is represented on the vertical axis, and the slope of the relationship curve gradually increases as the horizontal axis increases.

5. The microcontroller for an electronic cigarette according to any one of claims 1 to 4, characterized in that: The capacitance value change parameter is the capacitance value change amount or the capacitance value change rate.

6. The microcontroller for an electronic cigarette according to any one of claims 1 to 4, characterized in that: The capacitance change parameter is the capacitance change rate K; Wherein, K=(Nt-N0) / N0 or K=|Nt-N0| / N0 or K=(Nt-N0) / Nt or K=|Nt-N0| / Nt, Nt represents the real-time capacitance value of the capacitive microphone, and N0 represents the reference capacitance value of the capacitive microphone; The data includes Nt and N0; or, The data includes A and N0, wherein A is the difference between Nt-N0; or, The data includes A and Nt, wherein A is the difference between Nt-N0; or, The data include K and N0; or, The data include K and Nt.

7. The microcontroller for electronic cigarette according to claim 3, characterized in that: The relationship curve includes multiple segments, and different segments correspond to different cigarette lighting powers.

8. The microcontroller for electronic cigarette according to claim 1, characterized in that: The communication module is also used to receive the airflow direction; When the airflow direction is the inhalation direction, the processing module determines the target cigarette ignition power to be output according to the first corresponding relationship and the current capacitance value change parameter; When the airflow direction is the exhalation direction, the processing module controls the electronic cigarette not to light a cigarette or to stop lighting a cigarette.

9. A control circuit for an electronic cigarette, characterized in that: include: A capacitive microphone, a switch microphone chip connected to the capacitive microphone, and a microcontroller according to any one of claims 1 to 8; The switch microphone chip transmits data obtained based on the capacitance value of the capacitive microphone to the microcontroller through a data packet.

10. The electronic cigarette control circuit according to claim 9, characterized in that: The microcontroller and the switch microphone chip exchange information via data packets; The data packet sent by the switch microphone chip to the microcontroller includes a communication identification segment, a data segment, and an end state segment in sequence; The data packet sent by the microcontroller to the switch microphone chip includes a communication identification segment, a read / write segment, a data segment, and an end state segment in sequence, wherein the read / write segment is used to indicate whether the execution task of the data packet is a read operation or a write operation.

11. An electronic cigarette, characterized in that: The electronic cigarette control circuit comprises the electronic cigarette control circuit according to claim 9 or 10.

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