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 is configured to be driven by the alternating current to generate vibration so as to atomize the liquid matrix to generate aerosol; and the controller is configured to sample the voltage of the ultrasonic atomization element according to a preset frequency and determine the exhaustion or insufficiency of the liquid matrix on the ultrasonic atomization element according to the difference value between the maximum value and the minimum value in the sampled voltage values. According to the electronic atomization device, on the basis of the characteristic that the larger the voltage mean value during non-dry-burning of the ultrasonic atomization element is, the larger the voltage fluctuation during dry-burning is, and then dry-burning judgment is carried out by sampling and detecting the voltage fluctuation amplitude of the ultrasonic atomization element.

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 atomization devices, such as heating atomization devices or ultrasonic atomization devices. Among them, the heating atomization device heats and vaporizes the liquid delivered by the capillary element through a heating element to generate an aerosol for inhalation; the ultrasonic atomization device uses a vibrating component that can reciprocate at high frequency, such as a piezoelectric ceramic piece, to break up the liquid delivered by the capillary element into particles through high-frequency vibration to form an inhalable aerosol. The liquid may contain nicotine and / or fragrances and / or aerosol-generating substances (for example, glycerin). When the above atomization device is working, it is necessary to keep the liquid delivered by the capillary element to the heating element or the vibrating component sufficient to avoid "dry burning" when the liquid supply is insufficient. For the ultrasonic atomization device, it is impossible to determine whether the vibrating component is in a "dry burning" state by detecting whether the liquid on the vibrating component is exhausted or insufficient. 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 configured to be driven by an alternating current to generate vibrations to atomize a liquid matrix to generate an aerosol;

[0007] The controller is configured to sample the voltage of the ultrasonic atomization element at a predetermined frequency, and determine the exhaustion or insufficiency of the liquid matrix on the ultrasonic atomization element according to the difference between the maximum value and the minimum value of the sampled voltage values.

[0008] In some embodiments, it also includes:

[0009] A voltage shaping module, comprising at least a first capacitor and an integral circuit unit, and shaping the voltage of the ultrasonic atomization element through the first capacitor and the integral circuit unit in sequence;

[0010] The controller obtains the voltage of the ultrasonic atomization element by sampling the voltage value shaped by the voltage shaping module.

[0011] In some embodiments, the first capacitor and the integration circuit unit are connected in series;

[0012] Alternatively, a first end of the first capacitor is connected to the ultrasonic atomization element, and a second end of the first capacitor is connected to the integration circuit unit.

[0013] In some embodiments, the controller is configured to determine that the liquid matrix on the ultrasonic nebulization element is exhausted or insufficient when the difference is greater than a preset threshold.

[0014] In some embodiments, the controller is configured to prevent the supply of alternating current to the ultrasonic nebulization element upon determining depletion or insufficiency of the liquid matrix on the ultrasonic nebulization element.

[0015] In some embodiments, the predetermined frequency is between 0.5 MHz and 2 MHz.

[0016] Another embodiment of the present application further provides an electronic atomization device, comprising:

[0017] A liquid storage chamber, used for storing a liquid matrix;

[0018] An oscillation module, comprising an ultrasonic atomization element and an inductor; the oscillation module is configured to guide an alternating current flowing through the ultrasonic atomization element, thereby driving the ultrasonic atomization element to vibrate to atomize a liquid matrix to generate an aerosol;

[0019] DC battery, used for power supply;

[0020] A first resistor, electrically connected between the battery cell and the oscillation module;

[0021] The controller is configured to determine that the liquid matrix on the ultrasonic atomization element is exhausted or insufficient when the current value flowing through the first resistor is greater than a preset current threshold.

[0022] Another embodiment of the present application further provides an electronic atomization device, comprising:

[0023] A liquid storage chamber, used for storing a liquid matrix;

[0024] An ultrasonic atomizing element configured to be driven by an alternating current to generate vibrations to atomize a liquid matrix to generate an aerosol;

[0025] The controller is configured to sample the voltage of the ultrasonic atomization element at a predetermined frequency, and determine the exhaustion or insufficiency of the liquid matrix on the ultrasonic atomization element according to the change rate of the sampled voltage value.

[0026] Another embodiment of the present application further provides an electronic atomization device, comprising:

[0027] A liquid storage chamber, used for storing a liquid matrix;

[0028] An ultrasonic atomizing element configured to be driven by an alternating current to generate vibrations to atomize a liquid matrix to generate an aerosol;

[0029] The controller is configured to sample the voltage of the ultrasonic atomization element at a predetermined frequency, and determine the exhaustion or insufficiency of the liquid matrix on the ultrasonic atomization element when the maximum value of the sampled voltage values ​​is greater than a preset voltage threshold.

[0030] Another embodiment of the present application further provides a control method for an electronic atomization device, wherein the resistance atomization device comprises:

[0031] A liquid storage chamber, used for storing a liquid matrix;

[0032] An ultrasonic atomizing element configured to be driven by an alternating current to generate vibrations to atomize a liquid matrix to generate an aerosol;

[0033] The method comprises:

[0034] The voltage of the ultrasonic atomization element is sampled at a predetermined frequency, and the exhaustion or insufficiency of the liquid matrix on the ultrasonic atomization element is determined according to the difference between the maximum value and the minimum value of the sampled voltage values.

[0035] The above electronic atomization device is based on the characteristic that the greater the voltage average value of the ultrasonic atomization element when it is not dry-burning, the greater the voltage fluctuation during dry-burning, and then performs dry-burning judgment by sampling and detecting the voltage fluctuation amplitude of the ultrasonic atomization element. 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 yes Figure 2 A schematic diagram of basic components of one embodiment of the circuit;

[0040] Figure 4 is a schematic diagram of a voltage waveform of an ultrasonic atomization element sampled at a first sampling point in a state;

[0041] Figure 5 yes Figure 4A schematic diagram of an output voltage waveform after the voltage sampled at the first sampling point is shaped by the voltage shaping module;

[0042] Figure 6 is a schematic diagram of the voltage waveform of the ultrasonic atomization element sampled at the first sampling point in the dry burning state;

[0043] Figure 7 yes Figure 6 A schematic diagram of an output voltage waveform after the voltage sampled at the first sampling point is shaped by the voltage shaping unit;

[0044] Figure 8 It is a schematic diagram of the control process of the MCU controller in one embodiment. DETAILED DESCRIPTION

[0045] 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.

[0046] 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 disclosed herein 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).

[0047] 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.

[0048] See Figure 1As 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.

[0049] In an optional implementation, 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.

[0050] 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.

[0051] according to Figure 1 As shown, the power supply mechanism 20 includes:

[0052] 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;

[0053] The circuit 22 is used to guide the current between the battery cell 21 and the atomizer 10 .

[0054] according to Figure 1 As shown, the atomizer 10 comprises:

[0055] A mouthpiece 111 at the proximal end 110 is used for a user to draw suction;

[0056] The liquid storage chamber 11 is used to store the liquid matrix;

[0057] 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;

[0058] The liquid transfer element 13 is used to transfer the liquid matrix between the liquid storage chamber 11 and the ultrasonic atomization element 12 .

[0059] In an optional implementation, 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 vibration 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.

[0060] In an optional implementation, the liquid transfer element 13 can be a common capillary element, such as fiber cotton, a porous body, etc. In other preferred implementations, 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 BartelsMikrotechnik GmbH, and the piezoelectric micro pump of Takasago Fluidic Systems.

[0061] In an embodiment, 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 a 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.

[0062] according to Figure 2 and Figure 3 As shown, the circuit 22 includes:

[0063] The oscillation module 222, based on the principle of high-frequency oscillation, guides the generation of alternating current including periodic positive current and negative current through the ultrasonic atomization element 12, so that the ultrasonic atomization element 12 generates ultrasonic vibration to atomize the liquid matrix. Based on the common implementation of ultrasonic atomization, there are two types of currents that drive the ultrasonic atomization element 12 for ultrasonic atomization, one is the common high-frequency alternating current, and the other is a pulsed current with a constant direction and a variable magnitude; in this embodiment, the oscillation module 222 is an ultrasonic atomization driving module based on high-frequency alternating current.

[0064] according to Figure 2 and Figure 3 As shown, the circuit 22 includes:

[0065] MCU controller 224;

[0066] The first resistor R1 is connected between the oscillation module 222 and the battery cell 21; the first resistor R1 is used for current limiting and current monitoring in the main circuit;

[0067] The current detection module 221 determines the current of the main circuit by sampling the voltage of the first resistor R1; when the current of the first resistor R1 detected by the current detection module 221 is greater than the preset current value, the MCU controller 224 disconnects the battery cell 21 according to the detection result of the current detection module 221, thereby preventing the battery cell 21 from continuing to supply power to the oscillation module 222, thereby protecting the safety of the main circuit.

[0068] exist Figure 3 In the specific embodiment shown, the current detection module 221 includes an operational amplifier U1, which samples the voltage across the first resistor R1, calculates the current of the first resistor R1, and outputs it to the MCU controller 224. The MCU controller 224 receives the detection result of the current detection module 221 and compares it with the preset current value; when the current value is greater than the preset current value, the battery cell 21 is prevented from continuing to supply power to the oscillation module 222.

[0069] according to Figure 2 and Figure 3 As shown, the oscillation module 222 includes an ultrasonic atomization element 12, a first inductor L1, a second inductor L2, a first switch tube Q1 and a second switch tube Q2; wherein:

[0070] A first inductor L1, a first end of which is connected to the voltage output end of the battery cell 21 via a first resistor R1, and a second end of which is connected to the first end of the ultrasonic atomization element 12;

[0071] A second inductor L2, a first end of which is connected to the voltage output end of the battery cell 21 via the first resistor R1, and a second end of which is connected to the second end of the ultrasonic atomization element 12;

[0072] The first switch tube Q1 has a D pole connected to the second end of the first inductor L1, an S pole grounded, and a G pole receiving a pwm1 driving signal from the MCU controller 224 to be turned on / off;

[0073] The first switch tube Q2 has a D pole connected to the second end of the second inductor L2, an S pole grounded, and a G pole receiving a pwm2 driving signal from the MCU controller 224 to be turned on / off.

[0074] The MCU controller 224 controls the alternating conduction of the first switch tube Q1 and the second switch tube Q2 through the pwm1 drive signal and the pwm2 drive signal, thereby periodically guiding the alternating positive and negative currents to be supplied to the ultrasonic atomization element 12 to vibrate the ultrasonic atomization element 12 .

[0075] and in Figure 3 In the embodiment shown, the driving voltage provided by the circuit 22 to the oscillation module 222 including the ultrasonic atomization element 12 is a constant driving voltage Vcc provided by a voltage regulator. Furthermore, in practice, when the driving voltage is constant at Vcc, the voltage across the ultrasonic atomization element 12 is correlated with the atomization state.

[0076] In some embodiments, based on improving the vibration efficiency of the ultrasonic atomization element 12, the MCU controller 224 makes the driving frequency the same as or very close to the natural vibration frequency of the ultrasonic atomization element 12 during the control process, so that the ultrasonic atomization element 12 is in a resonant state during operation and has the highest efficiency; similarly, the amplitude and peak voltage are also the largest in the resonant state.

[0077] according to Figure 3 As shown, 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 voltage at the second end of the ultrasonic atomization element 12 can be obtained by sampling at the second sampling point W2. According to the usual resonance design, the voltage at both ends of the ultrasonic atomization element 12 in a normal working state is a simple harmonic waveform; for example Figure 4 , a schematic diagram of the waveform of the voltage at the first end of the ultrasonic atomization element 12 in the normal atomization state is shown in FIG. , and the voltage change sampled at the second sampling point W2 and the voltage change sampled at the first sampling point W1 are substantially reversely alternating, and they together constitute a simple harmonic waveform voltage of a complete cycle of the ultrasonic atomization element 12. Figure 4 In the voltage waveform shown, the voltage of the ultrasonic atomization element 12 in the normal atomization working state has a first amplitude V1, that is, the difference V1 between the maximum value and the minimum value of the voltage of the ultrasonic atomization element 12.

[0078] In order to facilitate the MCU controller 224 to accurately sample and identify the voltage of the ultrasonic atomization element 12 to determine the atomization state, Figure 2 and Figure 3 In the embodiment, the voltage of the ultrasonic atomizing element 12 is filtered and shaped to form a voltage waveform that is convenient for sampling and comparison calculation and is output to the MCU controller 224. Figure 2 and Figure 3 As shown, the circuit 22 also includes:

[0079] The voltage shaping module 223 is used to shape the voltage of any one of the first end or the second end of the ultrasonic atomization element 12 and output it so as to facilitate the MCU controller 224 to sample, obtain and analyze the atomization state.

[0080] Specifically, based on the characteristic that the voltage across the ultrasonic atomizing element 12 is a simple harmonic waveform, Figure 3 The voltage shaping module 223 is connected to the first sampling point W1 to sample and analyze the voltage at the first end of the ultrasonic atomization element 12; or in some equivalent embodiments, the voltage shaping module 223 can be connected to the second sampling point W2 to sample and analyze the voltage at the second end of the ultrasonic atomization element 12. And in the embodiment, the voltage shaping module 223 includes: a synchronization circuit unit 2231 and an integration circuit unit 2232.

[0081] The synchronous circuit unit 2231 includes a first capacitor C3, a diode D1, and voltage-dividing resistors R4 and R5; the voltage signal at the first end of the ultrasonic atomizing element 12 is filtered and compensated by the first capacitor C3, and then proportionally divided by the voltage-dividing resistors R4 and R5 and output to the integration circuit unit 2232; and the diode D1 is used to prevent reverse current between the first capacitor C3 and the voltage-dividing resistor R4. The voltage after synchronous shaping by the synchronous circuit unit 2231 is basically a complete cycle waveform with proportionally reduced amplitude and the same frequency.

[0082] Among them, the integration circuit unit 2232 is Figure 3 The most common passive RC integration circuit is mainly used to convert the sine wave output by the synchronization circuit unit 2231 into a substantially stable voltage output through the integration capacitor C4 and the resistor R6. In other more variant embodiments, the integration circuit unit 2232 can also use an active integration circuit. The voltage waveform output after shaping by the integration circuit unit 2232 is as follows: Figure 5 As shown in the figure; the voltage waveform output by the integration circuit unit 2232 after filtering is basically stable, and the voltage value is basically maintained at Figure 5 Average voltage V 平均 nearby.

[0083] In some embodiments, when the liquid matrix is ​​fully supplied, for a given ultrasonic atomization element 12, when the circuit 22 drives the ultrasonic atomization element 12 to oscillate at a high frequency using a given frequency and voltage, the average voltage V of the voltage shaped and output by the synchronization circuit unit 2231 is 平均 Basically constant.

[0084] When the liquid matrix provided to the ultrasonic atomizing element 12 is insufficient or exhausted during the high-frequency oscillation, i.e., when the liquid matrix is ​​dry-burned, the oscillation process of the ultrasonic atomizing element 12 is abnormal, for example Figure 6 FIG. 2 shows a schematic diagram of the voltage at the first end detected by the first sampling point W1 when the ultrasonic atomizing element 12 is in a dry-burning state during high-frequency oscillation; Figure 6 As shown, in the dry burning state, the voltage across the ultrasonic atomizing element 12 is in the shape of a sawtooth peak and a falling edge 11a. Figure 6In the voltage waveform shown, the voltage of the ultrasonic atomization element 12 in the dry-burning state has a second amplitude V2, that is, the difference V2 between the maximum and minimum voltages of the ultrasonic atomization element 12.

[0085] Also according to Figure 4 and Figure 6 In contrast, the second amplitude V2 in the actual dry-burning state is different from the first amplitude V1 in the normal atomization state; and the maximum peak value of the voltage of the ultrasonic atomization element 12 in the actual dry-burning state is also different from the first amplitude V1 in the normal atomization state. Figure 4 The maximum peak value in the normal atomization state is different and has a difference. And, according to the characteristics of the voltage fluctuation in the dry-burning state of the common ultrasonic atomization element 12, the difference V2 in the dry-burning state is different from the average voltage V in the normal atomization state. 平均 Related, specifically the average voltage V 平均 The larger it is, the greater the voltage fluctuation difference V2 in the dry-burning state is.

[0086] When the ultrasonic atomization element 12 is in a dry burning state, the voltage shaping module 223 further Figure 6 The voltage waveform output after voltage shaping is as shown in Figure 7 shown; according to Figure 7 The voltage shaped and output by the voltage shaping module 223 in the dry-burning state has intermittent and large abnormal fluctuations 11b.

[0087] In some embodiments, the MCU controller 224 can sample and calculate whether the voltage amplitude of the ultrasonic atomization element 12 is greater than the first amplitude V1 by sampling the output voltage of the voltage shaping module 223, thereby determining whether the ultrasonic atomization element 12 is in a dry burning state.

[0088] Or in another specific embodiment, based on Figure 5 The normal atomization state and Figure 7 The voltage shaping module 223 shapes the output voltage difference in the dry-burning state, and the MCU controller 224 is configured to determine whether the ultrasonic atomization element 12 is in the dry-burning state by sampling the output voltage of the voltage shaping module 223.

[0089] Specifically Figure 8 In a specific embodiment, the MCU controller 224 samples the voltage output by the voltage shaping module 223 to determine whether the ultrasonic atomization element 12 is in a dry burning state. The control process may include:

[0090] S100, setting a voltage threshold for determining whether dry burning occurs; in some embodiments, based on the characteristic that the larger the average voltage value of the ultrasonic atomization element is when not dry burning, the greater the voltage fluctuation is when dry burning, the voltage threshold is set to be the average voltage V above.平均 + reasonable fluctuation experience value; or in some more preferred embodiments, since there may be deviations in consistency between different electronic atomization device samples, the voltage threshold can also be set in the embodiment = the above average voltage V 平均 +The sum of reasonable fluctuation experience value+sample correction experience value; the sample correction experience value can be the expectation and standard deviation of the overall sample obtained after a large number of tests on a large number of different samples of the same batch, such as 500, and the empirical number obtained by mathematical modeling.

[0091] S200, high-frequency sampling is performed on the voltage output by the integration circuit unit 2232 of the voltage shaping module 223 within a predetermined time to obtain a sampled voltage value, and the difference between the maximum value and the minimum value of the sampled voltage value is calculated; in some specific embodiments, the MCU controller 224 controls the I / O interface to perform voltage sampling within about 10 to 60 ms at a frequency of about 0.5 MHz to 2 MHz (i.e., sampling once every 0.5 μs to 2 μs), and about 10,000 to 120,000 sampled voltage values ​​can be obtained; by subtracting the maximum value and the minimum value of the sampled voltage values, the difference between the maximum value and the minimum value of the sampled voltage values ​​can be obtained.

[0092] Or in some other embodiments, in order to make the difference between the maximum and minimum values ​​of the sampled voltage values ​​closer to reality, the maximum value of the sampled voltage value is obtained by averaging the three or five largest values ​​among 10,000 to 60,000 sampled voltage values; similarly, the minimum value of the sampled voltage value is obtained by averaging the three or five smallest values ​​among 10,000 to 60,000 sampled voltage values.

[0093] S300, compare the difference between the maximum and minimum values ​​of the sampled voltage values ​​in step S200 with the voltage threshold set in step S100; if the difference is greater than the set voltage threshold, it is determined that the ultrasonic atomization element 12 is in a dry-burning state, and the battery cell 21 is prevented from supplying power to the ultrasonic atomization element 12; and if the difference is less than the set voltage threshold, it is determined that the ultrasonic atomization element 12 is not in a dry-burning state, and the battery cell 21 is allowed to supply power to the ultrasonic atomization element 12.

[0094] Or in some other variation embodiments, in step S300, by calculating the ratio of the difference to the voltage threshold, when their ratio is greater than a preset value, it is determined to be in a dry-burning state; and when their ratio is less than the preset value, it is determined not to be in a dry-burning state.

[0095] Or in some other embodiments, the MCU controller 224 samples the voltage output by the voltage shaping module 223 to determine whether the ultrasonic atomization element 12 is in a dry burning state. The process may include:

[0096] S100a, perform high-frequency sampling on the voltage output by the integration circuit unit 2232 of the voltage shaping module 223 within a predetermined time to obtain a sampled voltage value, and compare the maximum value of the sampled voltage value with a preset voltage threshold; when the maximum value of the sampled voltage value is greater than the preset voltage threshold, it is determined that the ultrasonic atomization element 12 is in a dry-burning state, and power supply to the ultrasonic atomization element 12 is prevented; and when the maximum value of the sampled voltage value is less than the preset voltage threshold, it can be considered that the ultrasonic atomization element 12 is not in a dry-burning state, and power supply to the ultrasonic atomization element 12 can be allowed to continue.

[0097] based on Figure 4 and Figure 6 The difference in the voltage change shape of the ultrasonic atomization element 12 in the normal atomization state and the dry burning state shown in FIG. 1 ; in some other variant embodiments, the MCU controller 224 may include:

[0098] S100b, by sampling or obtaining the rate of change of the voltage of the ultrasonic atomizing element 12, it is determined whether the ultrasonic atomizing element 12 is in a dry burning state; obviously, according to Figure 6 As shown, the voltage of the ultrasonic atomization element 12 in the dry-burning state jumps, and the rate of change of the voltage of the ultrasonic atomization element 12 in the dry-burning state is greater than that in the normal atomization state. Then, the MCU controller 224 determines that the ultrasonic atomization element 12 is in the dry-burning state when the rate of change of the voltage of the ultrasonic atomization element 12 sampled or obtained is greater than the preset rate of change threshold.

[0099] In some other embodiments, when the ultrasonic atomization element 12 is in a dry burning state, the equivalent resistance of the ultrasonic atomization element 12 in the main circuit is reduced due to the lack of liquid matrix, so that the current value in the main circuit is increased compared with the normal atomization state; further, the MCU controller 224 may include:

[0100] S100c, when the current value flowing through the first resistor R1 is greater than a preset current threshold value, it is determined that the ultrasonic atomization element 12 is in a dry-burning state.

[0101] 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 atomizing element configured to be driven by an alternating current to generate vibrations to atomize a liquid matrix to generate an aerosol; The controller is configured to sample the voltage of the ultrasonic atomization element at a predetermined frequency, and determine the exhaustion or insufficiency of the liquid matrix on the ultrasonic atomization element according to the difference between the maximum value and the minimum value of the sampled voltage values.

2. The electronic atomization device according to claim 1, characterized in that: Also includes: A voltage shaping module, comprising at least a first capacitor and an integral circuit unit, and shaping the voltage of the ultrasonic atomization element through the first capacitor and the integral circuit unit in sequence; The controller obtains the voltage of the ultrasonic atomization element by sampling the voltage value shaped by the voltage shaping module.

3. The electronic atomization device according to claim 2, characterized in that: The first capacitor and the integration circuit unit are connected in series; Alternatively, a first end of the first capacitor is connected to the ultrasonic atomization element, and a second end of the first capacitor is connected to the integration circuit unit.

4. The electronic atomization device according to any one of claims 1 to 3, characterized in that: The controller is configured to determine the exhaustion or insufficiency of the liquid matrix on the ultrasonic atomization element when the difference is greater than a preset voltage threshold.

5. The electronic atomization device according to any one of claims 1 to 3, characterized in that: The controller is configured to prevent the supply of alternating current to the ultrasonic nebulizing element when depletion or insufficiency of the liquid substrate on the ultrasonic nebulizing element is determined.

6. The electronic atomization device according to any one of claims 1 to 3, characterized in that: The predetermined frequency is between 0.5 MHz and 2 MHz.

7. An electronic atomization device, characterized in that: include: A liquid storage chamber, used for storing a liquid matrix; An oscillation module, comprising an ultrasonic atomization element and an inductor; the oscillation module is configured to guide an alternating current flowing through the ultrasonic atomization element, thereby driving the ultrasonic atomization element to vibrate to atomize a liquid matrix to generate an aerosol; DC battery, used for power supply; A first resistor, electrically connected between the battery cell and the oscillation module; The controller is configured to determine that the liquid matrix on the ultrasonic atomization element is exhausted or insufficient when the current value flowing through the first resistor is greater than a preset current threshold.

8. An electronic atomization device, characterized in that: include: A liquid storage chamber, used for storing a liquid matrix; An ultrasonic atomizing element configured to be driven by an alternating current to generate vibrations to atomize a liquid matrix to generate an aerosol; The controller is configured to sample the voltage of the ultrasonic atomization element at a predetermined frequency, and determine the exhaustion or insufficiency of the liquid matrix on the ultrasonic atomization element according to the change rate of the sampled voltage value.

9. An electronic atomization device, characterized in that: include: A liquid storage chamber, used for storing a liquid matrix; An ultrasonic atomizing element configured to be driven by an alternating current to generate vibrations to atomize a liquid matrix to generate an aerosol; The controller is configured to sample the voltage of the ultrasonic atomization element at a predetermined frequency, and determine the exhaustion or insufficiency of the liquid matrix on the ultrasonic atomization element when the maximum value of the sampled voltage values ​​is greater than a preset voltage threshold.

10. A control method for an electronic atomization device, the resistive atomization device comprising: A liquid storage chamber, used for storing a liquid matrix; An ultrasonic atomizing element configured to be driven by an alternating current to generate vibrations to atomize a liquid matrix to generate an aerosol; Characterized in that the method comprises: The voltage of the ultrasonic atomization element is sampled at a predetermined frequency, and the exhaustion or insufficiency of the liquid matrix on the ultrasonic atomization element is determined according to the difference between the maximum value and the minimum value of the sampled voltage values.

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