Ultrasonic atomization device and control method thereof

Abstract

The invention provides an ultrasonic atomization device and a control method thereof.The ultrasonic atomization device comprises a battery cell used for providing electric power; the oscillating circuit comprises an ultrasonic atomization sheet; the ultrasonic atomization sheet is configured to generate high-frequency oscillation to atomize a liquid substrate so as to generate smokable aerosol; the controller is configured to sweep the frequency of the ultrasonic atomization sheet and detect the input current of the oscillating circuit; and the maximum input current is screened out from the multiple input currents, so that the atomization power of the ultrasonic atomization piece is adjusted and started in a linear correlation mode according to the maximum input current. According to the ultrasonic atomization device and the control method thereof, the problem that the amount of liquid mist sucked by the first port is small due to the fact that the atomization power is small due to increase of oscillation impedance during cold start of the ultrasonic atomization device can be solved, and the suction experience of a user is improved.

Description

Technical Field

[0001] This application relates to the technical field of ultrasonic atomization, and particularly to an ultrasonic atomization device and a control method thereof. Background Art

[0002] An ultrasonic atomization device includes an ultrasonic atomization sheet. When the ultrasonic atomization sheet generates high-frequency vibrations, a liquid matrix can be atomized to form a liquid mist for the user to inhale.

[0003] The cold start of existing ultrasonic atomization devices is relatively poor. Especially, the smaller the amount of liquid mist in the first puff during start-up suction, the longer the device has been placed. This affects the user's suction experience. This is because as the placement time increases, more and more liquid matrix accumulates on the ultrasonic atomization sheet, and at the same time, the liquid matrix continuously absorbs more moisture in the air, resulting in an increased load on the ultrasonic atomization sheet and an increased oscillation impedance. Summary of the Invention

[0004] This application provides an ultrasonic atomization device and a control method thereof to solve the problem of a relatively small amount of liquid mist in the first puff during the cold start of the ultrasonic atomization device.

[0005] On the one hand, this application provides an ultrasonic atomization device, including:

[0006] A battery cell for providing power;

[0007] An oscillation circuit including an ultrasonic atomization sheet; the ultrasonic atomization sheet is configured to generate high-frequency oscillations to atomize a liquid matrix to generate an aerosol for inhalation.

[0008] A controller configured to perform frequency sweeping on the ultrasonic atomization sheet and detect the input current of the oscillation circuit; screen out the maximum input current among multiple input currents, and linearly adjust the atomization power for starting the ultrasonic atomization sheet according to the maximum input current.

[0009] On the other hand, this application provides a control method for an ultrasonic atomization device, and the ultrasonic atomization device includes:

[0010] A battery cell for providing power;

[0011] An oscillation circuit including an ultrasonic atomization sheet; the ultrasonic atomization sheet is configured to generate high-frequency oscillations to atomize a liquid matrix to generate an aerosol for inhalation.

[0012] The method includes:

[0013] Perform frequency sweeping on the ultrasonic atomization sheet and detect the input current of the oscillation circuit;

[0014] Select the maximum input current from multiple input currents, and linearly adjust the atomization power of starting the ultrasonic atomization sheet according to the maximum input current.

[0015] For the ultrasonic atomization device and its control method provided by the present application, when performing frequency sweeping on the ultrasonic atomization device, detect the input current of the oscillation circuit, and then select the maximum input current from all input currents, and linearly adjust the atomization power of the ultrasonic atomization sheet according to the maximum input current; it can avoid the problem that when the ultrasonic atomization device is cold-started, the atomization power is small due to the increase of the oscillation impedance, resulting in a small amount of liquid mist sucked in the first puff, and improve the user's sucking experience. Brief Description of the Drawings

[0016] One or more embodiments are exemplarily illustrated by pictures in the corresponding drawings. These exemplary illustrations 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 drawings in the drawings do not constitute a proportional limitation.

[0017] Figure 1 It is a schematic diagram of the ultrasonic atomization device provided by the embodiment of the present application;

[0018] Figure 2 It is a schematic diagram of another ultrasonic atomization device provided by the embodiment of the present application;

[0019] Figure 3 It is a circuit block diagram of the ultrasonic atomization device provided by the embodiment of the present application;

[0020] Figure 4 It is a specific circuit schematic diagram of the ultrasonic atomization device provided by the embodiment of the present application;

[0021] Figure 5 It is a schematic diagram of the frequency sweeping frequency of the ultrasonic atomization sheet and the input current of the oscillation circuit provided by the embodiment of the present application;

[0022] Figure 6 It is a schematic diagram of the control method of the ultrasonic atomization device provided by the embodiment of the present application. Detailed Embodiments

[0023] To facilitate the understanding of the present application, the present application will be described in more detail below in conjunction with the drawings and specific embodiments. It should be noted that when an element is expressed as "fixed to" another element, it can be directly on the other element, or there can be one or more intermediate elements therebetween. When an element is expressed as "connected to" another element, it can be directly connected to the other element, or there can be one or more intermediate elements therebetween. The terms "upper", "lower", "left", "right", "inner", "outer" and similar expressions used in this specification are only for the purpose of illustration.

[0024] Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs. The terms used in this specification in the description of this application are only for the purpose of describing specific embodiments and are not intended to limit this application. The term "and / or" used in this specification includes any and all combinations of one or more of the related listed items.

[0025] Figure 1 It is a schematic diagram of an ultrasonic atomization device provided by an embodiment of this application.

[0026] As Figure 1 shown, the ultrasonic atomization device 100 includes an ultrasonic atomizer 10 and a power supply assembly 20, and the ultrasonic atomizer 10 and the power supply assembly 20 are non-detachable.

[0027] The ultrasonic atomizer 10 includes an ultrasonic atomization sheet 105. Under the action of the power provided by the power supply assembly 20, the ultrasonic atomization sheet 105 generates high-frequency oscillation, causing the liquid matrix to be atomized into aerosol.

[0028] The power supply assembly 20 includes a battery cell 21 and a circuit 22.

[0029] The battery cell 21 provides the power for operating the ultrasonic atomization device 100. The battery cell 21 can be a rechargeable battery cell or a disposable battery cell.

[0030] The circuit 22 can control the overall operation of the ultrasonic atomization device 100. The circuit 22 not only controls the operation of the battery cell 21 and the ultrasonic atomization sheet 105, but also controls the operation of other components in the ultrasonic atomization device 100.

[0031] Figure 2 It is a schematic diagram of another ultrasonic atomization device provided by an embodiment of this application. Different from Figure 1 the example, the ultrasonic atomizer 10 and the power supply assembly 20 are detachably connected. The ultrasonic atomizer 10 has electrical contacts 105a and 105b, and the power supply assembly 20 has electrical contacts 20a and 20b (positive and negative electrical contacts); when the ultrasonic atomizer 10 is connected to the power supply assembly 20, the electrical contact 105a remains in contact with the electrical contact 20a to form an electrical connection, and the electrical contact 105b remains in contact with the electrical contact 20b to form an electrical connection.

[0032] Figure 3 It is a circuit block diagram of the ultrasonic atomization device provided by an embodiment of this application; Figure 4 It is a specific circuit schematic diagram of the ultrasonic atomization device provided by an embodiment of this application.

[0033] As Figure 3 - Figure 4As shown, the circuit 22 includes a controller 221, a voltage conversion circuit 222, a current detection circuit 223, and an oscillation circuit 224.

[0034] The voltage conversion circuit 222 consists of a voltage converter U1 and its peripheral circuits. The voltage converter U1 is an integrated circuit with voltage conversion function obtained by integrating multiple electronic components. For example, a switching power supply chip with the function of boosting voltage level, reducing voltage level, or both. In this embodiment, the voltage converter U1 at least includes: a voltage input pin VIN, a voltage output pin VOUT, and a feedback pin FB.

[0035] The voltage input pin VIN of the voltage converter U1 is used to receive the cell voltage, and the voltage output pin VOUT of the voltage converter U1 is used to output the output voltage obtained by converting the cell voltage, that is, the input voltage of the oscillation circuit 224. The feedback pin FB of the voltage converter U1 is connected to the resistor R1 and the capacitor C9 through the resistor R6, and is connected to the voltage output pin VOUT through the resistor R4. The signal input by the controller 221 to the voltage conversion circuit 222 through the DC_adj terminal can be applied to the feedback pin FB, thereby controlling the output voltage of the voltage output pin VOUT.

[0036] The voltage converter U1 also includes a boost pin BST, a switch control pin SW, a compensation pin COMP, a fault signal pin ILIM, a power ground pin PGND, an analog ground pin AGND, a soft start pin SS, a chip power supply pin VDD, a mode selection pin MODE, and an enable pin EN.

[0037] An input inductor L1 can be connected between the voltage input pin VIN and the switch control pin SW. A bootstrap capacitor C4 can be connected between the switch control pin SW and the boost pin BST. The compensation pin COMP is grounded through a compensation capacitor C8 and a compensation resistor R7 in sequence. By appropriately adjusting the capacitance value of the compensation capacitor C8 and the resistance value of the compensation resistor R7, phase compensation can be achieved to avoid problems in the frequency domain response. The soft start pin SS can be grounded through a soft start capacitor C11 to help adjust the soft start time. The chip power supply pin VDD and the mode selection pin MODE can be grounded through a filter capacitor C10 to help provide a stable power supply voltage and achieve the selection of different normal operating modes (PWM mode) and low power consumption operating modes (PFM mode). The enable pin EN is grounded through a pull-down resistor R5 to prevent the chip from malfunctioning. The fault signal pin ILIM is grounded through a resistor R8, a resistor R9, and a capacitor C12.

[0038] The peripheral circuit of the voltage converter U1 further includes an input filtering unit composed of C1, C2, and C3, and an output filtering unit composed of C6 and C7, which are respectively used to filter the input voltage and the output voltage to improve the voltage waveform.

[0039] Further, the circuit 22 also includes a voltage detection circuit composed of a resistor R2 and a resistor R3, which is used to detect the cell voltage. The AD_VBAT terminal in the figure is connected to the controller 221.

[0040] A current detection circuit 223 is used to detect the input current of the oscillation circuit 224. The current detection circuit 223 mainly includes a sampling resistor R10 and a differential amplifier U2. The voltage across the sampling resistor R10 is processed by the differential amplifier U2 and then output to the controller 221 through the resistor R15 at the IOUT_ADC terminal. The controller 221 can determine the current flowing through the ultrasonic atomization sheet 105 according to the voltage across the sampling resistor R10 and the resistance value (known) of the sampling resistor R10.

[0041] The oscillation circuit 224 outputs drive signals to the transistor switch Q1 and the transistor switch Q2 by the controller 221 through the PWM_INT1 terminal and the PWM_INT2 terminal, so that the transistor switch Q1 or the transistor switch Q2 alternately conducts and disconnects, so that the inductor L2 or the inductor L3 is continuously charged and discharged, and generates a similar high-voltage sine wave to drive the ultrasonic atomization sheet 105 (set between the W1 terminal and the W2 terminal in the figure) to oscillate, thereby atomizing the liquid matrix to generate an aerosol that can be aspirated.

[0042] It can be understood that the controller 221 can directly drive the transistor switch Q1 and the transistor switch Q2, or drive the transistor switch Q1 and the transistor switch Q2 through a driver. The controller 221 can control the frequency of the drive signal (i.e., the drive frequency) to be the natural frequency or the optimal operating frequency of the ultrasonic atomization sheet 105 to improve the operating efficiency of the ultrasonic atomization sheet 105.

[0043] In Figure 4 Among them, the transistor switch Q1, the transistor switch Q2, the inductor L2, and the inductor L3 constitute a full-wave drive circuit. It can be understood that in other examples, a half-wave drive circuit can also be used.

[0044] Based on the above circuit, in one example, the controller 221 is configured to perform frequency sweeping on the ultrasonic atomization sheet 105 and detect the input current of the oscillation circuit 224; screen out the maximum input current among multiple input currents, so as to linearly adjust the atomization power for starting the ultrasonic atomization sheet 105 according to the maximum input current.

[0045] In a specific example, the controller 221 is configured to perform frequency sweeping on the ultrasonic atomization sheet 105 and detect the input current of the oscillation circuit 224 when the ultrasonic atomization sheet 105 starts atomization; and adjust the atomization power of the ultrasonic atomization sheet 105 during the first puff according to the maximum input current.

[0046] During the frequency sweeping process, the controller 221 controls the voltage conversion circuit 222 to keep the input voltage of the oscillation circuit 224 constant. At this constant voltage, the controller 221 controls the driving frequency of the transistor switch to be the frequency sweeping frequency, so as to perform frequency sweeping on the ultrasonic atomization sheet 105 and detect the input current of the oscillation circuit 224. Among them, the range of the frequency sweeping frequency can be determined according to the natural frequency of the ultrasonic atomization sheet 105. For example, assuming that the natural frequency of the ultrasonic atomization sheet 105 is f0, the range of the frequency sweeping frequency can be between f0 - △f and f0 + △f, and △f can be 50 - 150 KHz.

[0047] Take Figure 5 as an example. The natural frequency f0 of the ultrasonic atomization sheet 105 is 3 MHz, and the range of the frequency sweeping frequency is 2.9 MHz to 3.1 MHz. The controller 221 controls the driving frequency of the transistor switch to gradually decrease from 3.1 MHz to 2.9 MHz, and detect the input current of the oscillation circuit 224 corresponding to each frequency sweeping frequency. The result is shown in the figure. Figure 5 The upper curve is the curve of the frequency sweeping frequency, and the lower curve is the curve of the input current of the oscillation circuit 224. By comparison among all the input currents, the maximum input current is determined to be I0, and the corresponding frequency sweeping frequency is f0.

[0048] For different ultrasonic atomization devices, the minimum impedance value of the oscillation circuit 224 is different. Even for the same ultrasonic atomization device, as the placement time increases, the liquid matrix accumulated on the ultrasonic atomization sheet becomes more and more, and at the same time, the liquid matrix absorbs more and more moisture in the air, resulting in different minimum impedance values of the oscillation circuit 224. Therefore, the maximum input current screened by frequency sweeping is also different. For the oscillation circuit 224 with a larger minimum impedance value, the maximum input current screened by frequency sweeping is smaller; on the contrary, for the oscillation circuit 224 with a smaller minimum impedance value, the maximum input current screened by frequency sweeping is larger.

[0049] In actual work, for the oscillation circuit 224 with a larger minimum impedance value, a larger atomization power should be provided when starting to suck, otherwise there will be a problem that the amount of liquid mist during the first puff is small. For the oscillation circuit 224 with a smaller minimum impedance value, a smaller atomization power should be provided when starting to suck.

[0050] As can be seen from the above, there is a linear relationship between the minimum impedance value of the oscillation circuit 224 or the selected maximum input current and the atomization power of the ultrasonic atomization sheet 105. Based on this linear relationship, the atomization power of the ultrasonic atomization sheet 105 can be adjusted linearly related to the maximum input current, or the minimum impedance value of the oscillation circuit 224 can be determined according to the maximum input current, so as to adjust the atomization power of the ultrasonic atomization sheet 105 linearly related to the minimum impedance value of the oscillation circuit 224. For example, when the minimum impedance value of the oscillation circuit 224 or the selected maximum input current increases, the atomization power of the ultrasonic atomization sheet 105 can be increased synchronously; when the minimum impedance value of the oscillation circuit 224 or the selected maximum input current decreases, the atomization power of the ultrasonic atomization sheet 105 can be decreased synchronously.

[0051] In a specific implementation, the linear relationship data between the maximum input current and the atomization power of the ultrasonic atomization sheet 105, or the linear relationship data between the minimum impedance value of the oscillation circuit 224 and the atomization power of the ultrasonic atomization sheet 105 can be pre-stored in a memory (which can be the internal memory of the controller 221 itself). After determining the maximum input current or the minimum impedance value of the oscillation circuit 224, the atomization power of the ultrasonic atomization sheet 105 can be determined by looking up a table, so as to dynamically adjust the atomization power of the ultrasonic atomization sheet 105 at different maximum input currents or minimum impedance values. In another specific implementation, the maximum input current (or minimum impedance value) can be compared with the maximum input current (or minimum impedance value) during the previous aspiration. If the maximum input current relative to the previous aspiration decreases (the minimum impedance value increases), the atomization power of the ultrasonic atomization sheet 105 is correspondingly increased; conversely, if the maximum input current relative to the previous aspiration increases (the minimum impedance value decreases), the atomization power of the ultrasonic atomization sheet 105 is correspondingly decreased.

[0052] In one example, the controller 221 is configured to linearly adjust the input voltage of the oscillation circuit 224 according to the maximum input current.

[0053] In a specific implementation, the controller 221 can control the voltage conversion circuit 222 to adjust the input voltage of the oscillation circuit 224, for example, control the voltage conversion circuit 222 to increase or decrease the input voltage of the oscillation circuit 224.

[0054] In one example, the controller 221 is configured to control the operating frequency of the oscillation circuit 224 to approach the sweep frequency corresponding to the maximum input current.

[0055] Take Figure 5 as an example, the controller 221 can control the operating frequency of the oscillation circuit 224 to be the sweep frequency f0, or operate near the sweep frequency f0, so as to improve the operating efficiency of the ultrasonic atomization device.

[0056] Based on the above ultrasonic atomization device, an embodiment of the present application further provides a control method for an ultrasonic atomization device, and the method includes the steps:

[0057] S11. Perform frequency sweeping on the ultrasonic atomization sheet and detect the input current of the oscillation circuit;

[0058] S12. Screen out the maximum input current from the multiple input currents, and linearly adjust the atomization power for starting the ultrasonic atomization sheet according to the maximum input current.

[0059] In an example, when the ultrasonic atomization sheet starts to atomize, perform frequency sweeping on the ultrasonic atomization sheet and detect the input current of the oscillation circuit; adjust the atomization power of the ultrasonic atomization sheet during the first puff according to the maximum input current.

[0060] In an example, determine the range of the frequency sweeping frequency according to the natural frequency of the ultrasonic atomization sheet.

[0061] In an example, when performing frequency sweeping on the ultrasonic atomization sheet, keep the input voltage of the oscillation circuit constant.

[0062] In an example, linearly adjust the input voltage of the oscillation circuit according to the maximum input current.

[0063] In a specific example, according to the maximum input current, control the voltage conversion circuit to adjust the input voltage of the oscillation circuit.

[0064] In an example, determine the minimum impedance value of the oscillation circuit according to the maximum input current, and linearly adjust the atomization power of the ultrasonic atomization sheet according to the minimum impedance value of the oscillation circuit.

[0065] In an example, control the operating frequency of the oscillation circuit to approach the frequency sweeping frequency corresponding to the maximum input current.

[0066] It should be noted that the description and drawings of the present application give preferred embodiments of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described in this specification. These embodiments are not additional limitations to the content of the present application. The purpose of providing these embodiments is to make the understanding of the disclosed content of the present application more thorough and comprehensive. Moreover, the above technical features continue to be combined with each other to form various embodiments not listed above, which are all regarded as the scope described in the specification of the present application; further, for those of ordinary skill in the art, improvements or transformations can be made according to the above description, and all such improvements and transformations should fall within the protection scope of the appended claims of the present application.

Claims

1. An ultrasonic atomization device, characterized in that, Comprising: A battery cell for providing power; An oscillation circuit including an ultrasonic atomization sheet; the ultrasonic atomization sheet is configured to generate high-frequency oscillations to atomize a liquid matrix to generate an aerosol for inhalation; A controller configured to perform frequency sweeping on the ultrasonic atomization sheet and detect the input current of the oscillation circuit; screen out the maximum input current among multiple input currents, and linearly adjust the atomization power for starting the ultrasonic atomization sheet according to the maximum input current.

2. The ultrasonic atomization device according to claim 1, characterized in that The controller is configured to perform frequency sweeping on the ultrasonic atomization sheet and detect the input current of the oscillation circuit when the ultrasonic atomization sheet starts atomization; adjust the atomization power of the ultrasonic atomization sheet during the first puff according to the maximum input current.

3. The ultrasonic atomization device according to claim 1, characterized in that, The oscillation circuit includes a transistor switch, and the controller is configured to control the driving frequency of the transistor switch to be the frequency sweeping frequency to perform frequency sweeping on the ultrasonic atomization sheet and detect the input current of the oscillation circuit.

4. The ultrasonic atomization device according to claim 1, wherein, The controller is configured to determine the range of the frequency sweeping frequency according to the natural frequency of the ultrasonic atomization sheet.

5. The ultrasonic atomization device according to claim 1, characterized in that, The controller is configured to keep the input voltage of the oscillation circuit constant when performing frequency sweeping on the ultrasonic atomization sheet.

6. The ultrasonic atomization device according to claim 1, wherein, The controller is configured to linearly adjust the input voltage of the oscillation circuit according to the maximum input current.

7. The ultrasonic atomization device according to claim 6, characterized in that, Further comprising a voltage conversion circuit configured to convert the battery cell voltage into the input voltage of the oscillation circuit; The controller is configured to control the voltage conversion circuit to adjust the input voltage of the oscillation circuit according to the maximum input current.

8. The ultrasonic atomization device according to claim 1, characterized in that, The controller is configured to determine the minimum impedance value of the oscillation circuit according to the maximum input current, and linearly adjust the atomization power for starting the ultrasonic atomization sheet according to the minimum impedance value of the oscillation circuit.

9. The ultrasonic atomization device according to claim 1, characterized in that, The controller is configured to control the operating frequency of the oscillation circuit to approach the frequency sweeping frequency corresponding to the maximum input current.

10. The ultrasonic atomization device according to claim 1, wherein Further comprising a current detection circuit for detecting the input current of the oscillation circuit.

11. A control method for an ultrasonic atomization device, characterized in that, The ultrasonic atomization device includes: A battery cell for providing power; An oscillation circuit including an ultrasonic atomization sheet; the ultrasonic atomization sheet is configured to generate high-frequency oscillations to atomize a liquid matrix to generate an aerosol for inhalation; The method includes: Performing frequency sweeping on the ultrasonic atomization sheet and detecting the input current of the oscillation circuit; Screening out the maximum input current among multiple input currents, and linearly adjusting the atomization power for starting the ultrasonic atomization sheet according to the maximum input current.

12. The method according to claim 11, wherein The method further includes: Performing frequency sweeping on the ultrasonic atomization sheet and detecting the input current of the oscillation circuit when the ultrasonic atomization sheet starts atomization.

13. The method according to claim 11, wherein Determining the range of the frequency sweeping frequency according to the natural frequency of the ultrasonic atomization sheet.

14. The method according to claim 11, wherein The method further includes: Keeping the input voltage of the oscillation circuit constant when performing frequency sweeping on the ultrasonic atomization sheet.

15. The method according to claim 11, wherein The method further includes: Linearly adjusting the input voltage of the oscillation circuit according to the maximum input current.

16. The method according to claim 11, wherein The method further includes: Determine the minimum impedance value of the oscillation circuit according to the maximum input current, so as to linearly and correlatively adjust the atomization power for starting the ultrasonic atomization sheet according to the minimum impedance value of the oscillation circuit.

17. The method according to claim 11, wherein The method further includes: Controlling the operating frequency of the oscillation circuit to approach the sweep frequency corresponding to the maximum input current.

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