Electronic atomization apparatus and control method

Abstract

An electronic atomization apparatus (100) and a control method. The electronic atomization apparatus (100) comprises: a liquid storage cavity (11), which is used for storing a liquid substrate; an ultrasonic atomization element (12), which can be driven by an alternating current to atomize the liquid substrate to generate an aerosol; a drive unit, which provides the alternating current to the ultrasonic atomization element (12); a controller (221), which is configured to: control the drive unit to provide the alternating current, at a varying frequency, to the ultrasonic atomization element (12), so as to acquire a first frequency when the power of the ultrasonic atomization element (12) is at a maximum, and a second frequency when the phase difference between the voltage and the current of the ultrasonic atomization element (12) is zero; and control the drive unit to provide the alternating current, at a third frequency, to the ultrasonic atomization element (12) to drive the ultrasonic atomization element (12) to atomize the liquid substrate, wherein the third frequency is located between the first frequency and the second frequency. In the electronic atomization apparatus (100), the third frequency located between the first frequency and the second frequency is used as the working frequency of the ultrasonic atomization element (12), so that the ultrasonic atomization element (12) tends to work in an optimal resonance state as much as possible.

Description

Electronic atomization device and control method

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to the Chinese patent application filed with the China Patent Office on September 15, 2023, with application number 202311192341.9 and entitled “Electronic Atomization Device and Control Method,” the entire contents of which are incorporated herein by reference. Technical Field

[0003] The embodiments of the present application relate to the field of electronic atomization technology, and in particular to an electronic atomization device and a control method. Background Art

[0004] Smoking articles (eg, cigarettes, cigars, etc.) burn tobacco during use to produce tobacco smoke. Attempts have been made to replace these tobacco-burning articles by creating products that release compounds without combustion.

[0005] An example of such a product is an electronic atomization device, such as an ultrasonic atomization device. Such an ultrasonic atomization device includes a liquid, and an ultrasonic atomization element that can vibrate back and forth at high frequency, such as a piezoelectric ceramic piece, breaks up the liquid delivered by the capillary element through high-frequency vibration into particles, forming an inhalable aerosol. The liquid may contain nicotine and / or fragrances and / or aerosol-forming substances (for example, glycerol). In known electronic atomization devices, in order to maximize the working efficiency of ultrasonic atomization elements such as piezoelectric ceramic pieces, the frequency at which the working power of the ultrasonic atomization element is maximum is usually searched in a frequency sweeping manner, and the frequency at which the working power is maximum is used as the working frequency of the ultrasonic atomization element; however, monitoring in actual work has found that when the frequency at which the ultrasonic atomization element has the maximum power is used as the working frequency, the ultrasonic atomization element is not in a resonant state.

[0006] Summary of the Invention

[0007] One embodiment of the present application provides an electronic atomization device, comprising:

[0008] a liquid storage chamber for storing a liquid matrix;

[0009] An ultrasonic atomizing element is configured to be driven by an alternating current to atomize a liquid matrix to generate an aerosol;

[0010] a driving unit connected to the ultrasonic atomizing element and configured to provide AC to the ultrasonic atomizing element;

[0011] A controller is configured to perform a control step, wherein the control step includes:

[0012] controlling the driving unit to provide alternating current with varying frequency to the ultrasonic atomization element, obtaining the power of the ultrasonic atomization element to determine a first frequency when the power of the ultrasonic atomization element is maximum, and obtaining the phase difference between the voltage and current of the ultrasonic atomization element to determine a second frequency when the phase difference between the voltage and current of the ultrasonic atomization element is zero;

[0013] The driving unit is controlled to provide an alternating current with a third frequency to the ultrasonic atomizing element to drive the ultrasonic atomizing element to atomize the liquid matrix; the third frequency is between the first frequency and the second frequency.

[0014] In some embodiments, the third frequency is an average of the first frequency and the second frequency.

[0015] In some embodiments, the difference between the third frequency and the average value of the first frequency and the second frequency is less than half of the minimum step value of the frequency modulation of the MCU controller.

[0016] In some embodiments, it further includes:

[0017] A power detection module, used to detect the power of the ultrasonic atomization element;

[0018] The MCU controller obtains the power of the ultrasonic atomization element by sampling or receiving the detection result of the power detection module.

[0019] In some embodiments, the power detection module includes an operational amplifier.

[0020] In some embodiments, it further includes:

[0021] A phase detection module, used to detect the phase difference between the voltage and current of the ultrasonic atomization element;

[0022] The MCU controller obtains the phase difference between the voltage and current of the ultrasonic atomization element by sampling or receiving the detection result of the phase detection module.

[0023] In some embodiments, the phase detection module includes:

[0024] a waveform converter, configured to convert the voltage of the ultrasonic atomization element into a first square wave signal, and to convert the current of the ultrasonic atomization element into a second square wave signal;

[0025] A phase comparator is used to calculate the phase difference between the first square wave signal and the second square wave signal.

[0026] In some embodiments, the phase detection module further includes:

[0027] A direction comparator is used to compare the directions of the first square wave signal and the second square wave signal.

[0028] In some embodiments, it further includes:

[0029] an airflow sensor for sensing the user's puffs;

[0030] The controller is configured to cyclically repeat the control steps at predetermined intervals when the user takes a puff.

[0031] Another embodiment of the present application further provides a control method for an electronic atomization device, the electronic atomization device comprising:

[0032] a liquid storage chamber for storing a liquid matrix;

[0033] An ultrasonic atomizing element is configured to be driven by an alternating current to atomize a liquid matrix to generate an aerosol;

[0034] a driving unit connected to the ultrasonic atomizing element and configured to provide AC to the ultrasonic atomizing element;

[0035] The control method includes:

[0036] controlling the driving unit to provide alternating current with varying frequency to the ultrasonic atomization element, obtaining the power of the ultrasonic atomization element to determine a first frequency when the power of the ultrasonic atomization element is maximum, and obtaining the phase difference between the voltage and current of the ultrasonic atomization element to determine a second frequency when the phase difference between the voltage and current of the ultrasonic atomization element is zero;

[0037] The driving unit is controlled to provide an alternating current with a third frequency to the ultrasonic atomizing element to drive the ultrasonic atomizing element to atomize a liquid matrix to generate an aerosol, wherein the third frequency is between the first frequency and the second frequency.

[0038] The above electronic atomization device adopts a third frequency between the first frequency and the second frequency as the operating frequency of the ultrasonic atomization element, so that the ultrasonic atomization element can operate in the most suitable resonance state as much as possible. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] One or more embodiments are exemplarily illustrated by pictures in the corresponding drawings. These exemplifications do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements. Unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0040] FIG1 is a schematic diagram of an electronic atomization device provided by an embodiment;

[0041] FIG2 is a block diagram of an embodiment of the circuit in FIG1 ;

[0042] FIG3 is a schematic diagram of an admittance circle used to characterize the operating frequency characteristics of an ultrasonic atomization element;

[0043] FIG4 is a schematic diagram of basic components of an embodiment of a sine wave generator and a sine wave amplifier in FIG2 ;

[0044] FIG5 is a schematic diagram of basic components of an embodiment of the power detection module in FIG2 ;

[0045] FIG6 is a schematic diagram of basic components of an embodiment of the phase detection module in FIG2 ;

[0046] FIG7 is a schematic diagram comparing the sine wave output by the sine wave generator in FIG4 and the sine wave amplified by the sine wave amplifier;

[0047] FIG8 is a schematic diagram of a waveform converter converting an input sine wave signal into a square wave signal;

[0048] FIG9 is a schematic diagram showing the sampling power and operating frequency of an ultrasonic atomization element in one embodiment;

[0049] FIG10 is a schematic diagram of a control process of an MCU controller in one embodiment. DETAILED DESCRIPTION

[0050] In order to facilitate the understanding of the present application, the present application is described in more detail below with reference to the accompanying drawings and specific implementation methods.

[0051] One embodiment of the present application proposes an electronic atomization device for atomizing a liquid matrix to generate an aerosol for inhalation. The electronic atomization device of the present application can also be characterized as an aerosol generating system or a drug delivery product. Therefore, such a device or system can be adapted to provide one or more substances (e.g., flavoring agents and / or active pharmaceutical ingredients) in an inhalable form or state. For example, the inhalable substance can be substantially in the form of an aerosol (i.e., a suspension of fine solid particles or droplets in a gas).

[0052] Figure 1 shows a schematic structural diagram of an embodiment of an electronic atomization device 100; the device generally includes several components arranged in an external body or housing (which may be referred to as a shell). The overall design of the external body or housing may vary, and the type or configuration of the external body that may define the overall size and shape of the electronic atomization device 100 may vary. Typically, an elongated body similar in shape to a cigarette or cigar may be formed by a single integral shell, or the elongated shell may be formed by two or more separable bodies. For example, the electronic atomization device 100 may have a control body at one end, the control body having a shell containing one or more reusable components (e.g., a battery such as a rechargeable battery and / or a rechargeable supercapacitor, and various electronic devices for controlling the operation of the product), and an external body or shell at the other end that can be removably coupled and contains disposable components (e.g., a disposable flavored cartridge).

[0053] 1 , the electronic atomization device 100 includes an atomizer 10 that stores a liquid matrix and atomizes it to generate an aerosol, and a power supply mechanism 20 that supplies power to the atomizer 10. The power supply mechanism 20 and the atomizer 10 are detachably aligned in a functional relationship. Various mechanisms can be used to connect the atomizer 10 to the power supply mechanism 20 to produce a threaded connection, a press-fit connection, an interference fit, a magnetic connection, and the like. In some example embodiments, when the atomizer 10 and the power supply mechanism 20 are in an assembled configuration, the electronic atomization device 100 may be substantially in the shape of a rod, a flat cylinder, a rod, a column, and the like.

[0054] In an alternative embodiment, the power supply mechanism 20 and the atomizer 10 may comprise a separate, separate housing or outer body formed from any of a variety of different materials. The housing may be formed from any suitable structurally sound material. In some examples, the housing may be formed from a metal or alloy such as stainless steel or aluminum. Other suitable materials include various plastics (e.g., polycarbonate), metal-plated plastic, ceramic, and the like.

[0055] As shown in Figure 1 , an electronic atomization device 100 has a proximal end 110 and a distal end 120 that are opposed to each other along their length. During use, the proximal end 110 typically serves as the end inhaled by the user, while the distal end 120 is the end away from the user. The atomizer 10 is located at the proximal end, and the power supply 20 is located at the distal end 120.

[0056] As shown in FIG1 , the power supply mechanism 20 includes:

[0057] A battery cell 21 for powering the battery; the battery cell 21 may include, for example, a battery (disposable or rechargeable), a rechargeable supercapacitor, a rechargeable solid-state battery (SSB), a rechargeable lithium-ion battery (LiB), or a combination thereof;

[0058] The circuit 22 is used to guide the current between the battery cell 21 and the atomizer 10 .

[0059] As shown in FIG1 , the atomizer 10 includes:

[0060] A mouthpiece 111 at the proximal end 110 is used for the user to draw suction;

[0061] The liquid storage chamber 11 is used to store the liquid matrix;

[0062] The ultrasonic atomizing element 12 is in fluid communication with the liquid storage chamber 12 and atomizes the liquid matrix transferred to the ultrasonic atomizing element 12 into an aerosol through mechanical vibration;

[0063] The liquid transfer element 13 is used to transfer the liquid matrix between the liquid storage chamber 11 and the ultrasonic atomization element 12 .

[0064] In an optional embodiment, the ultrasonic atomizing element 12 can be a conventional sheet-shaped ultrasonic vibrating component or a sheet-shaped piezoelectric ceramic; or an ultrasonic atomizing sheet such as that proposed in Patent No. CN112335933A. During use, these ultrasonic atomizing elements 12 break up the liquid matrix through high-frequency vibration (preferably operating at a frequency of 1.0 MHz to 4.0 MHz, exceeding the human hearing range and belonging to the ultrasonic frequency band) to produce an aerosol in which particles are naturally suspended.

[0065] In an optional embodiment, the liquid transfer element 13 can be a conventional capillary element, such as fiber cotton, a porous body, etc. In other preferred embodiments, the liquid transfer element 13 can be a micropump that pumps a predetermined amount of liquid matrix from the liquid storage chamber 11 to the ultrasonic atomizing element 12, such as a micropump based on microelectromechanical system (MEMS) technology. Examples of suitable micropumps include the MDP2205 micropump and other micropumps of thinXXS Microtechnology AG, the mp5 and mp6 micropumps and other micropumps of Bartels Mikrotechnik GmbH, and the piezoelectric micropumps of Takasago Fluidic Systems.

[0066] In some further embodiments, the power supply mechanism 20 may further include:

[0067] The airflow sensor is used to sense the user's puffing action. When the airflow sensor senses the user's puffing action, the power supply mechanism 20 provides power to the ultrasonic atomizing element 12 of the nebulizer 100 so that the ultrasonic atomizing element 12 atomizes the liquid matrix to generate an aerosol.

[0068] In some embodiments, circuit 22 includes several electronic components and, in some examples, may be formed on a printed circuit board (PCB) that supports and electrically connects the electronic components. The electronic components may include a microprocessor or processor core and memory. In some examples, the control component may include a microcontroller with an integrated processor core and memory, and may further include one or more integrated input / output peripherals.

[0069] In some embodiments, the circuit 22 further includes:

[0070] The drive unit generates AC based on the principle of high-frequency oscillation and provides it to the ultrasonic atomizing element 12, thereby causing the ultrasonic atomizing element 12 to generate ultrasonic vibrations to atomize the liquid matrix. The ultrasonic atomizing element 12 is driven by periodic AC to cause high-frequency vibrations to atomize the liquid matrix. As shown in Figures 2 and 4, the drive unit drives the ultrasonic atomizing element 12 using standard sinusoidal AC; the drive unit includes:

[0071] a sine wave generator 222 for generating an AC signal with a sine waveform;

[0072] The sine wave amplifying module 223 is used to amplify the sinusoidal AC signal generated by the sine wave generator 222 to a strength or amplitude sufficient to drive the ultrasonic atomizing element 12 to vibrate, and provide the signal to the ultrasonic atomizing element 12 .

[0073] In the embodiments of Figures 2 and 4, the sine wave generator 222 includes a sine wave chip U1. The sine wave chip U1 generates a sinusoidal AC signal according to or based on parameters such as frequency, phase, and amplitude provided by the MCU controller 221, and outputs the signal through the output interface SW_OUT.

[0074] In the embodiments of Figures 2 and 4 , the sinusoidal waveform signal strength generated by the sinusoidal wave chip U1 is very low and cannot be directly used to drive the ultrasonic atomizing element 12. Instead, the signal is amplified by multiple amplifiers in the sinusoidal wave amplification module 223, such as amplifiers U2 and U3, in a two-stage process before being output to the ultrasonic atomizing element 12. For example, curve S1a in Figure 7 shows a schematic diagram of a sinusoidal waveform AC signal generated by the sinusoidal wave chip U1 in one embodiment, and curve S1b shows a schematic diagram of a sinusoidal waveform AC signal after multiple stages of amplification by the sinusoidal wave amplification module 223.

[0075] Or in some other variation embodiments, the driving unit can also provide alternating current such as a triangular wave, square wave, etc. to the ultrasonic atomizing element 12 to drive its vibration; accordingly, the driving unit can include a square wave generator or a triangular wave generator to replace the sine wave generator 222 to generate alternating current such as a triangular wave, square wave, etc.

[0076] As shown in Figures 2 and 4, to facilitate sampling and monitoring of the electrical characteristics of the ultrasonic atomization element 12 during operation, a first sampling point W1 and a second sampling point W2 are located at each end of the ultrasonic atomization element 12. During testing, the voltage at the first end of the ultrasonic atomization element 12 can be sampled at the first sampling point W1, and the current flowing through the ultrasonic atomization element 12 can be sampled at the second sampling point W2.

[0077] As shown in FIG2 and FIG5, the circuit 22 further includes:

[0078] The power detection module 224 is used to detect the power of the ultrasonic atomization element 12. In Figure 5, the power detection module 224 mainly includes an operational amplifier U4, which receives and calculates the current and / or power of the ultrasonic atomization element 12.

[0079] Alternatively, in some other embodiments, since the voltage of the ultrasonic atomization element 12 can be directly obtained by sampling the sampling pin of the MCU controller 221 from the first sampling point W1, a signal input terminal of the operational amplifier U4 is connected to the second sampling point W2 to sample and calculate the current of the ultrasonic atomization element 12; then the MCU controller 221 multiplies the voltage and current of the ultrasonic atomization element 12 to obtain the power of the ultrasonic atomization element 12.

[0080] As shown in FIG2 and FIG6 , the circuit 22 further includes:

[0081] The phase detection module 225 is used to detect the phase difference between the voltage and current of the ultrasonic atomizing element 12. Specifically, as shown in FIG6 , the phase detection module 225 includes:

[0082] The waveform converter 2251 is used to convert the sinusoidal waveform voltage of the ultrasonic atomization element 12 into a first square wave signal, and to convert the sinusoidal waveform current of the ultrasonic atomization element 12 into a second square wave signal.

[0083] For example, FIG8 shows a comparative schematic diagram of the square wave signal S2b converted by the waveform converter 2251 from the input sinusoidal wave signal S2a; the waveform converter 2251 converts the voltage and current of the sinusoidal waveform, whose phase is difficult to identify, into a square wave shape, which can be easily sampled and identified. The first square wave signal converted by the waveform converter 2251 is the same as the voltage of the sinusoidal waveform in period, direction and phase, and the second square wave signal is also the same as the current in period, direction and phase; and then, by sampling and detecting the easily identifiable square wave signal, the direction and phase of the current voltage and current current of the ultrasonic atomizing element 12 can be obtained. And as shown in FIG8, the amplitude of the square wave signal S2b is lower than that of the sinusoidal wave signal S2a, so that the signal strength is suitable for reception by the downstream signal interface.

[0084] As shown in FIG2 and FIG6, the phase detection module 225 further includes:

[0085] a direction comparator 2252 for comparing directions of a first square wave signal converted from voltage and a second square wave signal converted from current;

[0086] The phase comparator 2253 is used to calculate the phase difference between the first square wave signal converted from voltage and the second square wave signal converted from current.

[0087] In an embodiment, the MCU controller 221 searches for and determines the optimal resonant frequency that is most suitable for the operation of the ultrasonic atomization element 12 based on the admittance circle electrical principle of the operating frequency characteristics of the ultrasonic atomization element 12 and in combination with the detection results of the power detection module 224 and the phase detection module 225.

[0088] Specifically, Figure 3 shows the admittance circle diagram of the operating frequency characteristics of the ultrasonic atomization element 12. Among them, admittance is a general term for conductance and susceptance. In power electronics, admittance is defined as the reciprocal of impedance R. In the field of power electronics, admittance is represented by the symbol Y, and the unit is Siemens. Like impedance, admittance is also a complex number, consisting of a real part (conductance g) and an imaginary part (susceptance b): Y=g+jb. As shown in Figure 3, the horizontal axis is the conductance of the ultrasonic atomization element 12, and the vertical axis is the susceptance of the ultrasonic atomization element 12. The circle represents the values ​​of conductance and susceptance corresponding to different frequency points of the ultrasonic atomization element 12; the frequency of the ultrasonic atomization element 12 gradually increases clockwise along the circle.

[0089] As shown in FIG3 , when the operating frequency of the ultrasonic atomizing element 12 is the first frequency f m When the corresponding admittance is the largest and the impedance R is the smallest, the power of the ultrasonic atomizing element 12 is the largest; when the operating frequency of the ultrasonic atomizing element 12 is the second frequency f rWhen the susceptance is zero, the ultrasonic atomizing element 12 is equivalent to a pure resistor. At this time, the voltage and current on the ultrasonic atomizing element 12 are in the same phase, and the phase difference between the two is zero. Also, when the operating frequency of the ultrasonic atomizing element 12 is f s When the corresponding conductance is the largest; the frequency f s Located in f m and f r Between, that is, f m <f s <f r .

[0090] In this embodiment, the MCU controller 221 obtains the frequency at the first frequency f m and the second frequency f r As the operating frequency of the ultrasonic atomizing element 12, the ultrasonic atomizing element 12 is made to work in the most suitable resonant state as much as possible. As shown in FIG10 , the method for the MCU controller 221 to obtain the third frequency includes:

[0091] S10, controlling the driving unit including the sine wave generator 222 and the sine wave amplifying module 223 to provide alternating current with a sine waveform of varying frequency to the ultrasonic atomizing element 12 in a frequency sweeping manner;

[0092] During the frequency sweep process in step S10, the frequency change of the AC may be performed by a fast frequency sweep method that gradually increases or decreases based on a reference frequency; or in some other embodiments, the frequency sweep method may be performed by a differential frequency sweep method;

[0093] S20, determining a first frequency fm corresponding to when the power of the ultrasonic atomizing element 12 reaches maximum power as detected by the power detection module 224; and determining a second frequency fr corresponding to when the voltage and current of the ultrasonic atomizing element 12 are in the same direction and have a phase difference of 0 as detected by the phase detection module 225;

[0094] In step S20, based on the schematic diagram of the change in power and operating frequency of the ultrasonic atomizing element 12 shown in FIG9 , the power detection module 224 detects the power of the ultrasonic atomizing element 12 during the frequency sweep process, and the MCU controller 221 determines the corresponding first frequency fm when the power is maximum.

[0095] And in step S20, the phase detection module 225 detects the direction and phase difference of the voltage and current of the sinusoidal waveform of the ultrasonic atomization element 12; the MCU controller 221 determines the corresponding second frequency fr when the direction comparator 2252 determines that the directions of the voltage and current are the same, and the phase difference of the voltage and current detected by the phase comparator 2253 is 0.

[0096] S30, based on the first frequency fm and the second frequency fr obtained in step S20, a third frequency between the first frequency fm and the second frequency fr is obtained, and the ultrasonic atomizing element 12 is driven to operate at the third frequency;

[0097] In step S30 of this embodiment, since the first frequency fm and the second frequency fr both have errors with the most actual optimal resonant frequency fs, and the true value of the optimal resonant frequency fs cannot be calculated; a third frequency between the first frequency fm and the second frequency fr is taken, and the third frequency is closer to and closer to the optimal resonant frequency fs than any one of the first frequency fm and the second frequency fr, and then the third frequency is used as the operating frequency of the ultrasonic atomization element 12 to make the ultrasonic atomization element 12 tend to the optimal resonant state as much as possible.

[0098] In some specific embodiments, the above steps S10 and S20 provide an alternating current with a varying frequency to the ultrasonic atomizing element 12 in a frequency increasing manner from small to large to perform a frequency sweep, and accordingly detect and obtain the power of the ultrasonic atomizing element 12 to find the first frequency fm. Specifically, finding the first frequency fm includes:

[0099] S10a, calculating or selecting a reference frequency value: for example, reference frequency value = previous resonant frequency minus empirical value; the MCU controller 221 uses the reference frequency value as the initial value of the frequency sweep, and performs forward frequency modulation in a manner of increasing the minimum step value each time, so as to gradually increase the driving frequency provided to the ultrasonic atomizing element 12;

[0100] S20a, obtain the power of the ultrasonic atomizing element 12 detected by the power detection module 224, and record the power values ​​for 5 consecutive times as W n-2 、W n-1 、W n 、W n+1 、W n+2 ;

[0101] MCU controller 221 in W n At the same time, it is greater than W n-2 and W n-1 , and W n+1 、W n+2 At the same time, it is less than W n When W n is the maximum power; and then the maximum power W n The corresponding frequency modulation is determined to be the first frequency fm.

[0102] Alternatively, in some alternative embodiments, the maximum power value determined in step S20a may be determined by increasing the number of consecutively sampled power values ​​to improve accuracy. For example, by comparing seven, nine, eleven, or more consecutive detected power values, if a sampled power value is greater than both the preceding and subsequent power values, it is determined to be the maximum power value.

[0103] Similarly, the MCU controller 221 uses the reference frequency value as the initial value of the frequency sweep, and performs forward frequency modulation in a manner of increasing the minimum step value each time to gradually increase the driving frequency provided to the ultrasonic atomization element 12, and the comparator determines whether the phase difference between the voltage and current detected by the phase comparator 2253 is 0; when the comparator detects that the phase difference between the voltage and current detected by the phase comparator 2253 is 0, the MCU controller 221 can obtain the corresponding second frequency fr based on the phase difference between the voltage and current detected by the phase comparator 2253 being 0.

[0104] Or in some other variations of the embodiment, the MCU controller 221 controls the frequency sweep to find the first frequency fm by using forward frequency modulation to increase the sweep frequency and reverse frequency modulation to reduce the sweep frequency to gradually find the first frequency fm. Specifically, the MCU controller 221 sweeps the frequency with the reference frequency value as the initial value of the sweep, and obtains the power of the ultrasonic atomization element 12 detected by the power detection module 224; if the currently detected power is greater than the previous power value, the forward frequency modulation is continued to increase the sweep frequency; if the currently detected power is less than the previous power value, the reverse frequency modulation is performed to reduce the sweep frequency; the sweep frequency is adjusted in this way until the power of the ultrasonic atomization element 12 is the maximum, and the corresponding sweep frequency is determined to be the first frequency fm.

[0105] Similarly, in some other variations, the MCU controller 221 controls the frequency sweep to search for the second frequency fr by gradually searching for the second frequency fr using forward frequency modulation to increase the sweep frequency and reverse frequency modulation to decrease the sweep frequency. Specifically, the MCU controller 221 performs the frequency sweep using the reference frequency value as the initial value of the frequency sweep and obtains the phase difference between the voltage and current detected by the phase comparator 2253. If the currently detected phase difference is less than the previously detected phase difference, the MCU controller 221 continues forward frequency modulation to increase the sweep frequency. If the currently detected phase difference is greater than the previously detected phase difference, the MCU controller 221 performs reverse frequency modulation to decrease the sweep frequency. This cycle of adjusting the sweep frequency continues until the phase difference between the voltage and current detected by the phase comparator 2253 reaches 0, at which point the corresponding sweep frequency is determined to be the second frequency fr.

[0106] The frequency modulation of the MCU controller 221 in the product is based on the reference frequency value and is performed in a manner that increases or decreases with the minimum step value. That is, the frequency value that the MCU controller 221 can obtain = the reference frequency value (e.g., 3.0MHz) + n × the minimum step value (0.005MHz), where n is a positive integer. Furthermore, in a specific product, the difference between the first frequency fm and the second frequency fr is approximately 0.01MHz. The MCU controller 221 determines that there are actually only two n values ​​available for selection in obtaining the third frequency. Furthermore, in a specific product implementation, the MCU controller 221 is configured to select one of the only two available frequency values ​​as the third frequency. The error between these two frequency values ​​is negligible compared to the normal operating frequency range of 3.2MHz to 3.4MHz.

[0107] In some other optional embodiments, based on the fact that the difference between the first frequency fm and the second frequency fr of the ultrasonic atomization element 12 during product use is approximately 0.01 MHz, which is much smaller than the normal operating frequency range of 3.2 MHz to 3.4 MHz of the ultrasonic atomization element 12; the average value of the first frequency fm and the second frequency fr is taken as the third frequency, which can be considered as the most suitable resonant frequency point, that is: the third frequency = (first frequency fm + second frequency fr) / 2.

[0108] In a more preferred embodiment, the frequency modulation of the MCU controller 221 in the product is based on a reference frequency value and is performed in increments or decrements using a minimum step value. Specifically, the frequency value available to the MCU controller 221 = the reference frequency value (e.g., 3.0 MHz) + n × the minimum step value (0.005 MHz), where n is a positive integer. In this specific embodiment, the frequency value closest to (first frequency fm + second frequency fr) / 2 among the available frequency values ​​available to the MCU controller 221 is selected as the third frequency. The difference between the closest third frequency obtained by the MCU controller 221 using this specific modulation method and the average of the first frequency fm and the second frequency fr is less than half the minimum step value (0.005 MHz).

[0109] In some embodiments, after the production and assembly of the electronic atomization device 100 is completed, the MCU controller 221 controls the execution of the above control steps S10-S30 to obtain the third frequency, and saves or stores the third frequency, and then uses it as the working frequency of the subsequent ultrasonic atomization element 12 to control the ultrasonic atomization element 12 to work.

[0110] Alternatively, in some embodiments, the temperature of the ultrasonic atomization element 12 or the amount of liquid matrix accumulated on the surface of the ultrasonic atomization element 12 changes during each puffing action, causing the optimal resonant frequency of the ultrasonic atomization element 12 to shift. The MCU controller is configured to cyclically repeat the above control steps S10-S30 at intervals of 20ms to 500ms during each puffing action of the user, so as to track the frequency and control the atomization in real time through the user's puffing action, and continuously adjust the operating frequency of the ultrasonic atomization element 12 in real time during each puffing action of the user so that it is in the optimal resonant state.

[0111] Or in some other variations of the embodiments, the optimal resonant frequency of the ultrasonic atomizing element 12 may shift due to mechanical wear of the ultrasonic atomizing element 12 or changes in factors such as the viscosity of the liquid matrix caused by long-term use; the MCU controller 221 is configured to execute the above control steps S10-S30 at predetermined intervals to re-update or calibrate the third frequency.

[0112] It should be noted that the present specification and accompanying drawings provide preferred embodiments of the present application, but are not limited to the embodiments described herein. Furthermore, those skilled in the art will appreciate that improvements or modifications may be made based on the above description, and all such improvements and modifications are intended to fall within the scope of protection of the appended claims.

Claims

1. An electronic atomization device, characterized in that: include: A liquid storage chamber, used for storing a liquid matrix; An ultrasonic atomization element is configured to be driven by alternating current to atomize a liquid matrix to generate an aerosol; a driving unit connected to the ultrasonic atomization element and configured to provide AC to the ultrasonic atomization element; A controller is configured to perform a control step, wherein the control step comprises: Controlling the driving unit to provide alternating current with a variable frequency to the ultrasonic atomization element, and obtaining the power of the ultrasonic atomization element to determine a first frequency when the power of the ultrasonic atomization element is maximum, and obtaining the phase difference between the voltage and the current of the ultrasonic atomization element to determine a second frequency when the phase difference between the voltage and the current of the ultrasonic atomization element is zero; The driving unit is controlled to provide an alternating current having a third frequency to the ultrasonic atomization element, so as to drive the ultrasonic atomization element to atomize a liquid matrix; the third frequency is between the first frequency and the second frequency.

2. The electronic atomization device according to claim 1, characterized in that: The third frequency is an average of the first frequency and the second frequency.

3. The electronic atomization device according to claim 1, characterized in that: The difference between the third frequency and an average value of the first frequency and the second frequency is less than half of a minimum step value of frequency modulation of the MCU controller.

4. The electronic atomization device according to any one of claims 1 to 3, characterized in that: Also includes: A power detection module, used to detect the power of the ultrasonic atomization element; The MCU controller obtains the power of the ultrasonic atomization element by sampling or receiving the detection result of the power detection module.

5. The electronic atomization device according to claim 4, characterized in that: The power detection module includes an operational amplifier.

6. The electronic atomization device according to any one of claims 1 to 3, characterized in that: Also includes: A phase detection module, used to detect the phase difference between the voltage and current of the ultrasonic atomization element; The MCU controller obtains the phase difference between the voltage and current of the ultrasonic atomization element by sampling or receiving the detection result of the phase detection module.

7. The electronic atomization device according to claim 6, characterized in that: The phase detection module comprises: A waveform converter, used to convert the voltage of the ultrasonic atomization element into a first square wave signal, and to convert the current of the ultrasonic atomization element into a second square wave signal; A phase comparator is used to calculate the phase difference between the first square wave signal and the second square wave signal.

8. The electronic atomization device according to claim 7, characterized in that: The phase detection module also includes: A direction comparator is used to compare the directions of the first square wave signal and the second square wave signal.

9. The electronic atomization device according to any one of claims 1 to 3, characterized in that: Also includes: an airflow sensor for sensing the user's puff; The controller is configured to cyclically repeat the control steps at predetermined intervals when the user takes a puff.

10. A control method for an electronic atomization device, the electronic atomization device comprising: A liquid storage chamber, used for storing a liquid matrix; An ultrasonic atomization element is configured to be driven by alternating current to atomize a liquid matrix to generate an aerosol; a driving unit connected to the ultrasonic atomization element and configured to provide AC to the ultrasonic atomization element; Characterized in that the control method comprises: Controlling the driving unit to provide alternating current with a variable frequency to the ultrasonic atomization element, and obtaining the power of the ultrasonic atomization element to determine a first frequency when the power of the ultrasonic atomization element is maximum, and obtaining the phase difference between the voltage and the current of the ultrasonic atomization element to determine a second frequency when the phase difference between the voltage and the current of the ultrasonic atomization element is zero; The driving unit is controlled to provide an alternating current having a third frequency to the ultrasonic nebulization element so as to drive the ultrasonic nebulization element to nebulize a liquid matrix to generate an aerosol, wherein the third frequency is between the first frequency and the second frequency.

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