Electronic atomization device and control method

Abstract

The invention provides an electronic atomization device and a control method. The electronic atomization device comprises a liquid storage cavity used for storing a liquid matrix; the ultrasonic atomization element can be driven by alternating current to atomize the liquid substrate to generate aerosol; the driving unit provides alternating current for the ultrasonic atomization element; the controller is configured to control the driving unit to provide alternating current with variable frequency for the ultrasonic atomization element so as to obtain a first frequency when the power of the ultrasonic atomization element is maximum and 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 alternating current with a third frequency for the ultrasonic atomization element to drive the ultrasonic atomization element to atomize the liquid matrix; the third frequency is between the first frequency and the second frequency. According to the electronic atomization device, the third frequency located between the first frequency and the second frequency is adopted as the working frequency of the ultrasonic atomization element, so that the ultrasonic atomization element tends to work in the optimal resonance state as much as possible.

Description

Technical Field

[0001] 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

[0002] Smoking articles (eg, cigarettes, cigars, etc.) burn tobacco during use to produce tobacco smoke. People have attempted to replace these tobacco-burning articles by creating products that release compounds without combustion.

[0003] Examples of such products are electronic atomization devices, such as ultrasonic atomization devices. Such ultrasonic atomization devices include liquids, and ultrasonic atomization elements that can reciprocate at high frequency, such as piezoelectric ceramic sheets, break up the liquid delivered by the capillary element through high-frequency vibrations to form particles, forming an inhalable aerosol. The liquid may contain nicotine and / or fragrances and / or aerosol-generating substances (e.g., glycerol). In known electronic atomization devices, in order to maximize the working efficiency of ultrasonic atomization elements such as piezoelectric ceramic sheets, 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. Summary of the invention

[0004] An embodiment of the present application provides an electronic atomization device, comprising:

[0005] A liquid storage chamber, used for storing a liquid matrix;

[0006] An ultrasonic atomizing element is configured to generate vibrations by AC drive to atomize a liquid matrix to generate an aerosol;

[0007] a driving unit connected to the ultrasonic atomization element and configured to provide AC to the ultrasonic atomization element;

[0008] A controller is configured to perform a control step, wherein the control step comprises:

[0009] 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;

[0010] 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.

[0011] In some embodiments, the third frequency is an average of the first frequency and the second frequency.

[0012] 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.

[0013] In some embodiments, it also includes:

[0014] A power detection module, used to detect the power of the ultrasonic atomization element;

[0015] The MCU controller obtains the power of the ultrasonic atomization element by sampling or receiving the detection result of the power detection module.

[0016] In some embodiments, the power detection module includes an operational amplifier.

[0017] In some embodiments, it also includes:

[0018] A phase detection module, used to detect the phase difference between the voltage and current of the ultrasonic atomization element;

[0019] 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.

[0020] In some embodiments, the phase detection module includes:

[0021] 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;

[0022] A phase comparator is used to calculate the phase difference between the first square wave signal and the second square wave signal.

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

[0024] A direction comparator is used to compare the directions of the first square wave signal and the second square wave signal.

[0025] In some embodiments, it also includes:

[0026] an airflow sensor for sensing the user's puff;

[0027] The controller is configured to cyclically repeat the control steps at predetermined intervals when the user takes a puff.

[0028] Another embodiment of the present application further provides a control method for an electronic atomization device, the electronic atomization device comprising:

[0029] A liquid storage chamber, used for storing a liquid matrix;

[0030] An ultrasonic atomizing element is configured to generate vibrations by AC drive to atomize a liquid matrix to generate an aerosol;

[0031] a driving unit connected to the ultrasonic atomization element and configured to provide AC to the ultrasonic atomization element;

[0032] The control method comprises:

[0033] 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;

[0034] 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.

[0035] The above electronic atomization device uses a third frequency between the first frequency and the second frequency as the working frequency of the ultrasonic atomization element, so that the ultrasonic atomization element is as close to working in the most suitable resonance state as possible. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0037] Figure 1 is a schematic diagram of an electronic atomization device provided by an embodiment;

[0038] Figure 2 yes Figure 1 A structural block diagram of an embodiment of the circuit;

[0039] Figure 3 It is a schematic diagram of the admittance circle used to characterize the working frequency characteristics of the ultrasonic atomization element;

[0040] Figure 4 yes Figure 2 A basic device schematic diagram of an embodiment of a sine wave generator and a sine wave amplifier;

[0041] Figure 5 yes Figure 2A schematic diagram of basic components of an embodiment of a medium power detection module;

[0042] Figure 6 yes Figure 2 A basic device schematic diagram of an embodiment of a phase detection module;

[0043] Figure 7 yes Figure 4 A schematic diagram comparing the sine wave output by the sine wave generator and the sine wave amplified by the sine wave amplifier;

[0044] Figure 8 It is a schematic diagram of a waveform converter converting an input sine wave signal into a square wave signal;

[0045] Fig. 9 A schematic diagram showing the sampling power and operating frequency of an ultrasonic atomization element in one embodiment is shown;

[0046] Fig.10 It is a schematic diagram of the control process of the MCU controller in one embodiment. DETAILED DESCRIPTION

[0047] In order to facilitate the understanding of the present application, the present application is described in more detail below in conjunction with the accompanying drawings and specific implementation methods.

[0048] 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, this 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).

[0049] Figure 1 A schematic diagram of the structure of an embodiment of an electronic atomization device 100 is shown; the device generally includes several components disposed within an external body or housing (which may be referred to as a housing). 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 housing, or the elongated housing 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 housing 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 housing that can be removably coupled and contains a disposable portion (e.g., a disposable flavored cartridge) at the other end.

[0050] See also Figure 1 As shown, 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, thereby producing a threaded engagement, a press-fit engagement, an interference fit, a magnetic engagement, 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.

[0051] In an optional embodiment, the power mechanism 20 and the atomizer 10 may include a separate, separate housing or outer body that may be 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, aluminum, etc. Other suitable materials include various plastics (e.g., polycarbonate), metal-plating over plastic, ceramics, and the like.

[0052] See also Figure 1 As shown, the electronic atomization device 100 has a proximal end 110 and a distal end 120 opposite to each other along the length direction; wherein, in use, the proximal end 110 is usually used as the end inhaled by the user, and the distal end 120 is the end away from the user. The atomizer 10 is arranged at the proximal end, and the power supply mechanism 20 is arranged at the distal end 120.

[0053] according to Figure 1 As shown, the power supply mechanism 20 includes:

[0054] A battery cell 21 for supplying power; 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), etc., or some combination thereof;

[0055] The circuit 22 is used to guide the current between the battery cell 21 and the atomizer 10 .

[0056] according to Figure 1 As shown, the atomizer 10 comprises:

[0057] A mouthpiece 111 at the proximal end 110 is used for a user to draw suction;

[0058] The liquid storage chamber 11 is used to store the liquid matrix;

[0059] 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;

[0060] The liquid transfer element 13 is used to transfer the liquid matrix between the liquid storage chamber 11 and the ultrasonic atomization element 12 .

[0061] In an optional embodiment, the ultrasonic atomization element 12 can be a common sheet-shaped ultrasonic vibration component or a sheet-shaped piezoelectric ceramic; or an ultrasonic atomization sheet, such as that proposed in Patent No. CN112335933A. These ultrasonic atomization elements 12 break up the liquid matrix through high-frequency vibration (preferably the working frequency is 1.0MHz to 4.0MHz, which exceeds the human hearing range and belongs to the ultrasonic frequency band) to generate an aerosol with naturally suspended particles.

[0062] In an optional embodiment, the liquid transfer element 13 can be a common capillary element, such as fiber cotton, a porous body, etc. In other preferred embodiments, the liquid transfer element 13 can be a micro pump that pumps a predetermined amount of liquid matrix from the liquid storage chamber 11 to the ultrasonic atomization element 12; for example, a micro pump based on micro-electromechanical system (MEMS) technology. Examples of suitable micro pumps include the MDP2205 micro pump and other micro pumps of thinXXS Microtechnology AG, the mp5 and mp6 micro pumps and other micro pumps of Bartels Mikrotechnik GmbH, and the piezoelectric micro pump of Takasago FluidicSystems.

[0063] In some other embodiments, the power supply mechanism 20 may further include:

[0064] 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 atomization element 12 of the atomizer 100 to enable the ultrasonic atomization element 12 to atomize the liquid matrix to generate aerosol.

[0065] In some embodiments, the 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.

[0066] In some embodiments, the circuit 22 further includes:

[0067] The driving unit generates AC based on the principle of high-frequency oscillation and provides it to the ultrasonic atomizing element 12, so that the ultrasonic atomizing element 12 generates ultrasonic vibration to atomize the liquid matrix. The ultrasonic atomizing element 12 is driven by periodic AC to make it vibrate at high frequency to atomize the liquid matrix. Figure 2 and Figure 4 As shown, the driving unit drives the ultrasonic atomizing element 12 through a standard sinusoidal AC. The driving unit includes:

[0068] A sine wave generator 222, used to generate an AC signal with a sine waveform;

[0069] The sine wave amplifying module 223 is used to amplify the sine wave AC signal generated by the sine wave generator 222 , so that the signal is amplified to a strength or amplitude that can drive the ultrasonic atomizing element 12 to vibrate, and then provided to the ultrasonic atomizing element 12 .

[0070] exist Figure 2 and Figure 4 In the embodiment of the present invention, the sine wave generator 222 includes a sine wave chip U1. The sine wave chip U1 generates a sine wave AC signal according to or based on parameters such as frequency, phase, amplitude, etc. provided by the MCU controller 221, and outputs the signal through the output interface SW_OUT.

[0071] exist Figure 2 and Figure 4 In the embodiment, since the signal strength of the sine wave generated by the sine wave chip U1 is very small, it cannot be directly used to drive the ultrasonic atomization element 12 to work; it is then output to the ultrasonic atomization element 12 after secondary amplification by multiple amplifiers in the sine wave amplification module 223, such as amplifiers U2 and U3. Figure 7 The middle curve S1a shows a schematic diagram of a sinusoidal AC signal generated by the sinusoidal chip U1 in one embodiment, and the curve S1b shows a schematic diagram of a sinusoidal AC signal after multi-stage amplification by the sinusoidal wave amplification module 223 .

[0072] Or in some other variations, the driving unit can also provide similar triangular wave, square wave and other alternating current 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 triangular wave, square wave and other alternating current.

[0073] according to Figure 2 and Figure 4 As shown, in order 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 arranged at both ends of the ultrasonic atomization element 12. During detection, the voltage at the first end of the ultrasonic atomization element 12 can be obtained by sampling at the first sampling point W1; and the current flowing through the ultrasonic atomization element 12 can be detected by sampling at the second sampling point W2.

[0074] according to Figure 2 and Figure 5 As shown, the circuit 22 also includes:

[0075] The power detection module 224 is used to detect the power of the ultrasonic atomization element 12. Figure 5 In the embodiment, 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.

[0076] 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.

[0077] according to Figure 2 and Figure 6 As shown, the circuit 22 also includes:

[0078] The phase detection module 225 is used to detect the phase difference between the voltage and current of the ultrasonic atomization element 12. Figure 6 As shown in , the phase detection module 225 includes:

[0079] The waveform converter 2251 is used to convert the voltage of the sinusoidal waveform of the ultrasonic atomization element 12 into a first square wave signal, and to convert the current of the sinusoidal waveform of the ultrasonic atomization element 12 into a second square wave signal.

[0080] For example Figure 8 The diagram shows a comparison of the waveform converter 2251 converting the input sine wave signal S2a into a square wave signal S2b; the waveform converter 2251 converts the voltage and current of the sine 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 sine waveform in period, direction and phase, and the second square wave signal is also the same as the current in period, direction and phase; then, by sampling and detecting the easily identifiable square wave signal, the current voltage and current direction and phase of the ultrasonic atomization element 12 can be obtained. And according to Figure 8 As shown, the amplitude of the square wave signal S2b is reduced compared to the amplitude of the sine wave signal S2a, so that the signal strength is suitable for reception by the downstream signal interface.

[0081] according to Figure 2 and Figure 6 As shown, the phase detection module 225 also includes:

[0082] A direction comparator 2252, for comparing the directions of the first square wave signal converted from the voltage and the second square wave signal converted from the current;

[0083] The phase comparator 2253 is used to calculate the phase difference between the first square wave signal converted from the voltage and the second square wave signal converted from the current.

[0084] In an embodiment, the MCU controller 221 searches for and determines the most suitable resonant frequency for the ultrasonic atomization element 12 based on the admittance circle electrical principle of the operating frequency characteristics of the ultrasonic atomization element 12 and combines the detection results of the power detection module 224 and the phase detection module 225 .

[0085] Specifically Figure 3 The admittance circle diagram of the working frequency characteristics of the ultrasonic atomization element 12 is shown; wherein 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. According to Figure 3 As shown, the horizontal axis is the conductance of the ultrasonic atomization element 12, the vertical axis is the susceptance of the ultrasonic atomization element 12, and 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 in the clockwise direction of the circle.

[0086] according to Figure 3 As shown in FIG. , when the operating frequency of the ultrasonic atomization 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 atomization element 12 is the largest; when the operating frequency of the ultrasonic atomization element 12 is the second frequency f r When the susceptance is zero, the ultrasonic atomization element 12 is equivalent to a pure resistor. At this time, the voltage and current on the ultrasonic atomization element 12 are in the same phase, and the phase difference between the two is zero. Also, when the operating frequency of the ultrasonic atomization element 12 is f s When the corresponding conductance is the largest; frequency f s Located at m and f r Between, that is, f m <f s <f r .

[0087] In this embodiment, the MCU controller 221 obtains the frequency at the first frequency f m and the second frequency f r The third frequency between is used as the working frequency of the ultrasonic atomization element 12, so that the ultrasonic atomization element 12 is as close to working as possible in the most suitable resonance state. Fig.10 As shown, the method for the MCU controller 221 to obtain the third frequency includes:

[0088] S10, controlling the driving unit including the sine wave generator 222 and the sine wave amplification module 223 to provide alternating current of a sine wave with a varying frequency to the ultrasonic atomization element 12 in a frequency sweeping manner;

[0089] In the frequency sweep process in step S10, the frequency change of the AC can 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 can be performed by a difference frequency sweep method;

[0090] S20, when the power of the ultrasonic atomization element 12 detected by the power detection module 224 reaches the maximum, the corresponding first frequency fm is determined; and when the voltage and current of the ultrasonic atomization element 12 detected by the phase detection module 225 are in the same direction and the phase difference is 0, the corresponding second frequency fr is determined;

[0091] In step S20, based on Fig. 9 The schematic diagram of the change of the power and the working frequency of the ultrasonic atomization element 12 shown in the figure, by detecting the power of the ultrasonic atomization element 12 by the power detection module 224 during the frequency sweep process, the MCU controller 221 determines the corresponding first frequency fm according to the maximum power;

[0092] 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 atomizing element 12; the MCU controller 221 determines the corresponding second frequency fr when the direction comparator 2252 determines that the direction of the voltage and the current are the same, and the phase difference between the voltage and the current detected by the phase comparator 2253 is 0;

[0093] 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 atomization element 12 is driven to work at the third frequency;

[0094] In step S30 of this embodiment, since the first frequency fm and the second frequency fr both have errors with the most actual optimal resonance frequency fs, and the true value of the optimal resonance 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 resonance 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 approach the optimal resonance state as much as possible.

[0095] In some specific embodiments, the above steps S10 and S20 provide the ultrasonic atomizing element 12 with an alternating current of varying frequency for frequency sweeping in a manner of increasing frequency from small to large, and detect and obtain the power of the ultrasonic atomizing element 12 accordingly to find the first frequency fm. Specifically, finding the first frequency fm includes:

[0096] S10a, calculating or selecting a reference frequency value: for example, reference frequency value = last resonance frequency - 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 to gradually increase the driving frequency provided to the ultrasonic atomization element 12;

[0097] S20a, obtaining the power of the ultrasonic atomizing element 12 detected by the power detection module 224, and recording the power values ​​for 5 consecutive times as W n-2 , W n-1 , W n , W n+1 , W n+2 ;

[0098] MCU controller 221 according to 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 as the first frequency fm.

[0099] Or in some other variations of the embodiments, step S20a determines the maximum power value, and the number of consecutively sampled power values ​​can be increased to improve accuracy; for example, comparing 7, 9, 11 or more consecutive detection power values; when a certain sampled power value is greater than the power values ​​of the previous and next several times at the same time, it can be determined to be the maximum power value.

[0100] 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 compares the voltage detected by the phase comparator 2253 and the phase difference value of the current to see if they are 0; when the comparator detects that the phase difference value between the voltage detected by the phase comparator 2253 and the phase difference value of the current is 0, the MCU controller 221 can obtain and determine the corresponding second frequency fr based on the voltage detected by the phase comparator 2253 and the phase difference value of the current is 0.

[0101] 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, and if the currently detected power is less than the previous power value, the reverse frequency modulation is used 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.

[0102] Similarly, in some other embodiments of the variation, the MCU controller 221 controls the frequency sweeping to find the second frequency fr by using forward frequency modulation to increase the frequency sweeping frequency and reverse frequency modulation to reduce the frequency sweeping frequency to gradually find the second frequency fr. Specifically, the MCU controller 221 sweeps the frequency with the reference frequency value as the initial value of the frequency sweeping, and obtains the phase difference between the voltage detected by the phase comparator 2253 and the current; if the currently detected phase difference is less than the phase difference detected last time, the forward frequency modulation is continued to increase the frequency sweeping frequency, and if the currently detected phase difference is greater than the phase difference detected last time, the reverse frequency modulation is used to reduce the frequency sweeping frequency; the frequency sweeping frequency is adjusted in this way in a cycle until the phase difference between the voltage detected by the phase comparator 2253 and the current is 0, and the corresponding frequency sweeping frequency is determined to be the second frequency fr.

[0103] The frequency modulation of the MCU controller 221 in the product is based on the reference frequency value and is increased or decreased in the minimum step value, that is, the frequency value that the MCU controller 221 can obtain = the reference frequency value (for example, 3.0MHz) + n × the minimum step value (0.005MHz); wherein n is a positive integer. And 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 the acquisition of the third frequency. Furthermore, in a specific product implementation, the MCU controller 221 is configured to select one of only two available frequency values ​​as the third frequency, and their errors are negligible compared to the normal operating frequency range of 3.2MHz to 3.4MHz.

[0104] 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.

[0105] In a more preferred embodiment, the frequency modulation of the MCU controller 221 in the product is based on the reference frequency value and is increased or decreased in a minimum step value, that is, the frequency value that the MCU controller 221 can obtain = reference frequency value (for example, 3.0MHz) + n × minimum step value (0.005MHz); where n is a positive integer. In a specific embodiment, the frequency value closest to (first frequency fm + second frequency fr) / 2 among the frequency values ​​that the MCU controller 221 can obtain is selected as the third frequency. The difference between the closest third frequency obtained by the MCU controller 221 in this specific manner and the average value of the first frequency fm and the second frequency fr is less than half of the minimum step value (0.005MHz).

[0106] 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, which is then used as the working frequency of the subsequent ultrasonic atomization element 12 to control the ultrasonic atomization element 12 to work.

[0107] Alternatively, in some embodiments, based on the change in the temperature of the ultrasonic atomization element 12 or the amount of liquid matrix accumulated on the surface of the ultrasonic atomization element 12 in each puffing action, the optimal resonant frequency of the ultrasonic atomization element 12 shifts; the MCU controller is configured to cyclically repeat the above control steps S10-S30 at intervals of 20ms to 500ms in each puffing action of the user, so as to track the frequency and control the atomization in real time during the user's puffing action, so as to continuously adjust the operating frequency of the ultrasonic atomization element 12 in real time during each puffing action of the user so as to keep it in the optimal resonant state.

[0108] Or in some other variations of the embodiments, the optimum resonant frequency of the ultrasonic atomization element 12 shifts due to mechanical wear of the ultrasonic atomization 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.

[0109] It should be noted that the preferred embodiments of the present application are given in the specification and drawings of the present application, but are not limited to the embodiments described in the specification. Furthermore, it is possible for a person of ordinary skill in the art to make improvements or changes based on the above description, and all such improvements and changes should fall within the scope of protection of the claims attached to the present application.

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 the minimum step value of the 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 atomizing element is configured to generate vibrations by AC drive 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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