CN117206120A

CN117206120A - Ultrasonic atomizer and power control method for ultrasonic atomization

Info

Publication number: CN117206120A
Application number: CN202210626029.5A
Authority: CN
Inventors: 李新军; 徐中立; 李永海
Original assignee: Shenzhen FirstUnion Technology Co Ltd
Current assignee: Shenzhen FirstUnion Technology Co Ltd
Priority date: 2022-06-02
Filing date: 2022-06-02
Publication date: 2023-12-12
Also published as: WO2023232112A1

Abstract

The application discloses an ultrasonic atomizer and a power control method of ultrasonic atomization, wherein the ultrasonic atomizer comprises a liquid storage cavity, an ultrasonic atomization sheet, a control circuit and a power supply, and the liquid storage cavity is used for storing a liquid matrix; the ultrasonic atomizing sheet is used for generating oscillation to atomize the liquid matrix; the control circuit is configured to: in the working process of the ultrasonic atomizing sheet, acquiring current flowing through the ultrasonic atomizing sheet, and determining the target working voltage of the ultrasonic atomizing sheet according to the current flowing through the ultrasonic atomizing sheet and the target working power; the voltage provided by the power supply is adjusted to provide a target operating voltage for the ultrasonic atomizing plate. Through the mode, the corresponding working voltage can be continuously matched for the ultrasonic atomization sheet based on the target working power, so that the ultrasonic atomization sheet is kept to have a good atomization effect and high working efficiency.

Description

Ultrasonic atomizer and power control method for ultrasonic atomization

Technical Field

The application relates to the technical field of electronic circuits, in particular to an ultrasonic atomizer and a power control method for ultrasonic atomization.

Background

Ultrasonic atomizer utilizes ultrasonic atomization technique to realize the device of atomizing function. Currently, during the use of ultrasonic atomizers, a manner of providing a fixed voltage to an ultrasonic atomizing plate in the ultrasonic atomizer is generally adopted.

However, in the operation of the ultrasonic atomizing sheet, if the fixed voltage is set to be small, the atomization effect in the starting stage of the operation of the ultrasonic atomizing sheet may be poor; if the fixed voltage is set to be larger, the ultrasonic atomizing sheet needs to be made to work far away from the resonance frequency point in order to prevent the working power of the ultrasonic atomizing sheet from being too large, and at the moment, the working current of the ultrasonic atomizing sheet is too small, so that the working efficiency of the ultrasonic atomizing sheet is lower.

Disclosure of Invention

The application aims to provide an ultrasonic atomizer and a power control method for ultrasonic atomization, which can continuously match corresponding working voltages for an ultrasonic atomization sheet based on target working power so as to keep the ultrasonic atomization sheet to have better atomization effect and higher working efficiency.

To achieve the above object, in a first aspect, the present application provides an ultrasonic atomizer comprising:

a liquid storage chamber for storing a liquid matrix;

an ultrasonic atomizing plate for generating oscillation to atomize the liquid matrix;

a control circuit and a power supply;

wherein the control circuit is configured to:

in the working process of the ultrasonic atomizing sheet, acquiring current flowing through the ultrasonic atomizing sheet, and determining target working voltage of the ultrasonic atomizing sheet according to the current flowing through the ultrasonic atomizing sheet and target working power;

And adjusting the voltage provided by the power supply to provide a target working voltage for the ultrasonic atomization sheet.

In an alternative manner, the target working power is kept at a first power at a starting stage in the working process of the ultrasonic atomization sheet, wherein the first power is the maximum power of the ultrasonic atomization sheet in the working process.

In an alternative manner, the target operating power of the ultrasonic atomizing plate exhibits a decreasing trend between a start-up phase and a steady phase during operation of the ultrasonic atomizing plate.

In an alternative manner, the waveform of the actual working power of the ultrasonic atomizing sheet is a constant amplitude oscillation at a stable stage in the working process of the ultrasonic atomizing sheet.

In an alternative manner, the control circuit includes a controller, a switching leg, and a voltage conversion leg;

the switching branch is connected between a power supply and a voltage conversion branch, and is connected with the controller, and is configured to be conducted in response to a first control signal output by the controller so as to establish connection between the power supply and the voltage conversion branch;

The voltage conversion branch is also connected with the ultrasonic atomization sheet, and is configured to boost the voltage of the power supply and output an adjustable voltage to provide a target working voltage for the ultrasonic atomization sheet.

In an alternative manner, the switch branch includes a first switch and a second switch;

the first switch is connected between the controller and the second switch, one end of the first switch is grounded, and the first switch is configured to be turned on in response to the first control signal so as to establish connection between the second switch and the ground;

the second switch is connected between the power supply and the voltage conversion branch, and the second switch is configured to be turned on when the second switch is grounded so as to establish a connection between the power supply and the voltage conversion branch.

In an alternative manner, the voltage conversion branch includes a first voltage conversion chip and a first capacitor;

the first end of the first capacitor is respectively connected with the controller and the feedback pin of the first voltage conversion chip, and the first capacitor is configured to charge based on the pulse signal output by the controller and generate adjustable first voltage so that the voltage output pin of the first voltage conversion chip outputs adjustable voltage;

Wherein, the duty ratio of the pulse signal and the first voltage show positive correlation.

In an alternative manner, the voltage conversion branch includes a second voltage conversion chip and a variable resistor;

the first end of the variable resistor is connected with the feedback pin of the second voltage conversion chip, and the variable resistor is configured to adjust the resistance value based on a second control signal output by the controller so as to adjust the voltage output by the voltage output pin of the second voltage conversion chip;

the resistance value of the variable resistor and the voltage output by the voltage output pin input to the second voltage conversion chip show a negative correlation.

In an alternative, the control circuit further comprises a voltage detection branch;

the voltage detection branch is connected with the voltage conversion branch, and is configured to output a voltage detection signal in response to the voltage output by the voltage conversion branch and input to the controller, so that the controller adjusts the voltage output by the voltage conversion branch in real time based on the target operating voltage.

In an alternative manner, the voltage detection branch includes a first resistor, a second resistor, and a second capacitor;

The first end of the first resistor is connected with the voltage conversion branch, the second end of the first resistor is respectively connected with the first end of the second resistor, the first end of the second capacitor and the controller, and the second end of the second resistor and the second end of the second capacitor are grounded.

In an alternative mode, the control circuit further comprises a capacitance branch and an inductance branch, wherein the capacitance branch is connected with the ultrasonic atomization sheet in series to form a first circuit, and the inductance branch is connected with the first circuit to form a second circuit;

the capacitive branch and the inductive branch are used for switching the impedance characteristic of the second circuit into the inductance when the ultrasonic atomization sheet works at a series resonance point, so that the phase difference between the working current and the working voltage of the ultrasonic atomization sheet is smaller than 40 degrees.

In an alternative manner, the capacitance branch is configured such that the capacitance value of the capacitance branch is smaller than the capacitance value of the equivalent capacitance when the ultrasonic atomizing sheet operates at the series resonance frequency point.

In an alternative manner, the capacitive branch includes a third capacitance, and the inductive branch includes a first inductance;

The third capacitor is connected with the ultrasonic atomization sheet in series;

the first inductor is connected with the first circuit in parallel, or the first inductor is connected with the third capacitor and the ultrasonic atomization sheet in series.

In a second aspect, the present application provides an ultrasonic atomizer comprising:

a liquid storage chamber for storing a liquid matrix;

a control circuit and a power supply;

wherein the control circuit is configured to:

acquiring the current output by the power supply in the working process of the ultrasonic atomization sheet;

and smoothly adjusting the voltage provided by the power supply according to the current output by the power supply so as to adjust the actual working power of the ultrasonic atomization sheet, thereby enabling the difference value between the actual working power and the target working power to be in a first preset range.

In a third aspect, the present application provides a power control method of ultrasonic atomization applied to an ultrasonic atomizer including a liquid storage chamber for storing a liquid matrix, and an ultrasonic atomization plate for generating oscillation to atomize the liquid matrix, the method comprising:

acquiring current flowing through the ultrasonic atomization sheet;

Determining a target working voltage of the ultrasonic atomization sheet according to the current and the target working power;

and outputting the target working voltage.

In an alternative, the method further comprises:

outputting voltages of a plurality of frequencies in a preset frequency range to drive the ultrasonic atomization sheet;

acquiring current flowing through the ultrasonic atomization sheet corresponding to each frequency;

and determining the resonant frequency of the ultrasonic atomization sheet according to the current of the ultrasonic atomization sheet corresponding to each frequency.

In an alternative, the method further comprises:

at a start-up stage in the ultrasonic atomizing sheet working process, the target working power is kept to be a first power, and the first power is larger than 10W.

In an alternative, the method further comprises:

at a stable stage in the working process of the ultrasonic atomization sheet, the target working power is any one of 6W and 8W, and the difference value between the actual working power of the ultrasonic atomization sheet and the target working power is within the range of [ -2W, +2W ].

In an alternative manner, the outputting the target operating voltage includes:

the target operating voltage is output in the range of [3v,20v ].

The ultrasonic atomizer provided by the application comprises a liquid storage cavity for storing a liquid matrix, an ultrasonic atomizing sheet for generating oscillation to atomize the liquid matrix, a control circuit and a power supply. Wherein the control circuit is configured to: in the working process of the ultrasonic atomizing sheet, the current flowing through the ultrasonic atomizing sheet is obtained, and the target working voltage of the ultrasonic atomizing sheet is determined according to the current flowing through the ultrasonic atomizing sheet and the target working power. And adjusts the voltage provided by the power supply to provide a target operating voltage for the ultrasonic atomizing plate. Therefore, in the working process of the ultrasonic atomizing sheet, the working voltage of the ultrasonic atomizing sheet can be adjusted in real time according to the current flowing through the ultrasonic atomizing sheet and the target working power, and different working voltages can be provided for the ultrasonic atomizing sheet at different stages in the working process of the ultrasonic atomizing sheet so as to match the power requirements of the ultrasonic atomizing sheet at different stages. For example, in the starting stage of the ultrasonic atomizing sheet work, larger power is usually required to enable the ultrasonic atomizing sheet to have better atomizing effect, and larger working voltage can be provided for the ultrasonic atomizing sheet in the starting stage of the ultrasonic atomizing sheet work so as to meet the high power requirement of the ultrasonic atomizing sheet in starting; for another example, in a stable stage of operation of the ultrasonic atomizing sheet, it is generally required to maintain the operating power of the ultrasonic atomizing sheet at a small and reasonable value, and at this time, the operating power of the ultrasonic atomizing sheet can be continuously adjusted to a proper range for matching the corresponding operating voltage of the ultrasonic atomizing sheet based on the target operating power, and meanwhile, the ultrasonic atomizing sheet can also be made to operate near the series resonance point, so that the ultrasonic atomizing sheet also has a high operating efficiency.

Drawings

One or more embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings, in which like references indicate similar elements, and in which the figures of the drawings are not to be taken in a limiting sense, unless otherwise indicated.

Fig. 1 is a schematic structural diagram of an ultrasonic atomizer according to an embodiment of the present application;

fig. 2 is a schematic structural diagram of an ultrasonic atomizer according to another embodiment of the present application;

FIG. 3 is a flowchart of a method performed by a control circuit according to an embodiment of the present application;

FIG. 4 is a flowchart for determining the resonant frequency of an ultrasonic atomizing sheet according to an embodiment of the present application;

FIG. 5 is a schematic diagram of target working power and actual working power of an ultrasonic atomizing sheet according to an embodiment of the present application;

FIG. 6 is a flowchart of a method performed by a control circuit according to another embodiment of the present application;

FIG. 7 is a flow chart of a method for controlling power of ultrasonic atomization according to an embodiment of the present application;

fig. 8 is a schematic structural diagram of a control circuit according to an embodiment of the present application;

fig. 9 is a schematic structural diagram of a controller according to an embodiment of the present application;

fig. 10 is a schematic circuit diagram of a switching leg according to an embodiment of the present application;

Fig. 11 is a schematic circuit structure diagram of a voltage conversion branch and a voltage detection branch according to an embodiment of the present application;

fig. 12 is a schematic circuit diagram of a voltage converting branch circuit and a voltage detecting branch circuit according to another embodiment of the present application;

fig. 13 is a schematic structural diagram of a capacitive branch and an inductive branch according to an embodiment of the present application;

fig. 14 is a schematic circuit structure diagram of a capacitive branch circuit and an inductive branch circuit according to an embodiment of the present application.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

Referring to fig. 1, fig. 1 is a schematic structural diagram of an ultrasonic atomizer according to an embodiment of the present application. As shown in fig. 1, the ultrasonic atomizer 100 includes a liquid storage chamber 11, an ultrasonic atomizing plate 12, a control circuit 13, and a power supply 14.

Wherein the reservoir 11 is used for storing a liquid matrix, which may comprise different substances depending on the different use scenarios, e.g. in the field of electronic aerosolization, may comprise nicotine and/or a fragrance and/or an aerosol generating substance (e.g. glycerin); as another example, in the field of medical nebulization, solvents such as drugs and/or physiological saline with therapeutic or health benefits may be included.

The ultrasonic atomizing sheet 12 is in fluid communication with the liquid storage cavity 11, and the ultrasonic atomizing sheet 12 can be directly arranged in the liquid storage cavity 11, or the atomizing cavity where the ultrasonic atomizing sheet 12 is located is directly communicated with the liquid storage cavity 11, or liquid transmission is performed between the ultrasonic atomizing sheet 12 and the liquid storage cavity 11 through a liquid absorption medium. The ultrasonic atomizing plate 12 is used to generate oscillation to atomize the liquid matrix, i.e., to atomize the liquid matrix transferred onto or near the ultrasonic atomizing plate 12 into an aerosol by vibration. Specifically, the ultrasonic atomizing plate 12 breaks up the liquid matrix by high-frequency vibration (preferably, vibration frequency is 1.7MHz to 4.0MHz, more than human hearing range belongs to ultrasonic frequency band) in use to generate aerosol with naturally suspended particles.

The control circuit 13 is electrically connected to the ultrasonic atomizing plate 12, and the control circuit 13 is configured to provide a driving voltage and a driving current for the ultrasonic atomizing plate 12 according to the power supply 14. In one embodiment, the control circuit 13 may be disposed on a Printed Circuit Board (PCB).

The power supply 14 is used for supplying power. In one embodiment, the power source 14 is a battery. The battery may be a lithium ion battery, a lithium metal battery, a lead-acid battery, a nickel-cadmium battery, a nickel-hydrogen battery, a lithium-sulfur battery, a lithium-air battery, a sodium ion battery, or the like, and is not limited herein. In terms of scale, the battery in the embodiment of the present application may be a battery cell, or may be a battery module formed by connecting a plurality of battery cells in series and/or in parallel, and the like, which is not limited herein. Of course, in other embodiments, the battery may include more or fewer elements, or have different element configurations, as the embodiments of the application are not limited in this respect.

In one embodiment, the ultrasonic atomizer 100 further comprises a liquid transfer medium 15, an air outlet channel 16. Wherein the liquid transfer element 15 is used to transfer the liquid matrix between the liquid reservoir 11 and the ultrasonic atomizer plate 12. The outlet channel 16 is used to output the inhalable vapor or aerosol produced by the liquid matrix for inhalation by the user.

The ultrasonic atomizer 100 may be integrated or assembled. In an embodiment, when the ultrasonic atomizer 100 is assembled, the ultrasonic atomizer 100 further includes a power supply mechanism and an ultrasonic atomizer, wherein the ultrasonic atomizer includes a first housing 17, and the power supply mechanism includes a second housing 18.

In an embodiment, the first housing 17 and the second housing 18 are detachably connected, for example, the first housing 17 and the second housing 18 may be detachably connected by a snap structure or a magnetic structure. The first case 17 and the second case 18 together function to house and protect other components. The liquid storage cavity 11, the ultrasonic atomization sheet 12, the liquid transfer element 15 and the air outlet channel 16 are all disposed in the first housing 17, and the control circuit 13 and the power supply 14 are all disposed in the second housing 18.

The first housing 17 is removably aligned in functional relation with the second housing 18. The second housing 18 may be connected to the first housing 17 using various mechanisms to create a threaded engagement, a press-fit engagement, an interference fit, a magnetic engagement, or the like. In some embodiments, the ultrasonic atomizer 100 may be substantially rod-shaped, flat cylindrical, rod-shaped, or cylindrical in shape, etc., when the first housing 17 and the second housing 18 are in an assembled configuration.

The first housing 17 and the second housing 18 may be formed of any suitable structurally sound material. In some examples, the first housing 17 and the second housing 18 may be formed of a metal or alloy such as stainless steel, aluminum, or the like. Other suitable materials include various plastics (e.g., polycarbonate), metal-plated plastics (metal-plating over plastic), ceramics, and the like.

It should be noted that the hardware configuration of the ultrasonic atomizer 100 as shown in fig. 1 is only one example, and the ultrasonic atomizer 100 may have more or fewer components than shown in the drawings, may combine two or more components, or may have different component configurations, and the various components shown in the drawings may be implemented in hardware, software, or a combination of hardware and software including one or more signal processing and/or application specific integrated circuits. For example, as shown in fig. 2, the ultrasonic atomizing plate 12 may be provided in the liquid storage chamber 11, and the structure may be simplified.

Meanwhile, it should be understood that the ultrasonic atomizer 100 shown in fig. 1 or 2 may be applied to a variety of different situations and serve different functions, and the embodiment of the present application is not limited thereto. For example, in an embodiment, the ultrasonic atomizer 100 is applied to the medical field, and in this case, the ultrasonic atomizer 100 may be a medical atomizer, which can perform atomization of a liquid medicine added into the medical atomizer and allow a patient to inhale the medical atomizer, so as to achieve an effect of assisting treatment. For another example, in another embodiment, the ultrasonic atomizer 100 may also be used as an electronic product, such as an electronic cigarette, where the electronic cigarette is an electronic product that is inhaled by a user after a nicotine solution is turned into an aerosol by means of atomization or the like.

Referring to fig. 3, fig. 3 shows method steps that the control circuit 14 can perform, i.e. the control circuit 13 is configured to perform the following steps:

step 301: during the operation of the ultrasonic atomizing sheet, the current flowing through the ultrasonic atomizing sheet is obtained.

When the working frequencies of the ultrasonic atomization sheets are different, the current flowing through the ultrasonic atomization sheets is different, namely, the current flowing through the ultrasonic atomization sheets is changed along with the change of the working frequencies of the ultrasonic atomization sheets. The operating frequency of the ultrasonic atomizing plate is determined by the voltage for driving the ultrasonic atomizing plate, for example, in one embodiment, when the frequency of the ultrasonic atomizing plate is in the megahertz (MHz) level, the driving voltage of the ultrasonic atomizing plate is between 12V and 24V; when the frequency of the ultrasonic atomizing plate is in the kilohertz (KHz) level, the driving voltage of the ultrasonic atomizing plate is between 3V and 12V.

Meanwhile, in order for an ultrasonic atomizing sheet to have high working efficiency, it is generally necessary to operate the ultrasonic atomizing sheet in the vicinity of the resonance frequency point. However, in the working process of the ultrasonic atomizing sheet, as the temperature rise and the stress action on the ultrasonic atomizing sheet are changed, the current corresponding to the resonant frequency of the ultrasonic atomizing sheet is changed in real time, so that the ultrasonic atomizing sheet needs to be continuously subjected to frequency tracking, namely the resonant frequency of the ultrasonic atomizing sheet is continuously determined, so that the ultrasonic atomizing sheet is controlled to keep working near the resonant frequency point. In one embodiment, the resonant frequency of the ultrasonic atomizing plate may be continuously determined by:

Step 401: voltages of a plurality of frequencies in a preset frequency range are output to drive the ultrasonic atomizing plate.

Step 402: and acquiring the current flowing through the ultrasonic atomization sheet corresponding to each frequency.

Step 403: and determining the resonant frequency of the ultrasonic atomization sheet according to the current of the ultrasonic atomization sheet corresponding to each frequency.

Specifically, when the ultrasonic atomizing plate works under a certain voltage, a plurality of different frequencies are selected in a preset frequency range to drive the ultrasonic atomizing plate respectively. Then, at each vibration frequency of the ultrasonic atomizing sheet, a current flowing through the ultrasonic atomizing sheet corresponds, and by obtaining the current flowing through the ultrasonic atomizing sheet corresponding to each frequency, the resonant frequency of the ultrasonic atomizing sheet can be determined, for example, in an embodiment, the maximum value of the current flowing through the ultrasonic atomizing sheet corresponding to each frequency is obtained, and the frequency corresponding to the maximum value current can be set as the current resonant frequency of the ultrasonic atomizing sheet.

It will be appreciated that the frequency tracking process for the ultrasonic atomizing sheet should be continuously operated during the operation of the ultrasonic atomizing sheet, that is, after the current resonant frequency of the ultrasonic atomizing sheet is determined in the above embodiment, the steps shown in fig. 4 should be further performed again to update the resonant frequency of the ultrasonic atomizing sheet in real time, so as to control the ultrasonic atomizing sheet to keep operating around the resonant frequency all the time.

Step 302: and determining the target working voltage of the ultrasonic atomizing sheet according to the current flowing through the ultrasonic atomizing sheet and the target working power.

Step 303: the voltage provided by the power supply is adjusted to provide a target operating voltage for the ultrasonic atomizing plate.

The target working power is preset working power, which can be set according to practical application conditions, and the embodiment of the application is not particularly limited.

For example, in an embodiment, referring to fig. 5, fig. 5 schematically illustrates a schematic diagram of a target operating power and an actual operating power of an ultrasonic atomizing sheet, where a curve L1 is a schematic diagram of the actual operating power; the dashed line L2 is a schematic diagram of the target operating power.

As shown in fig. 5, in the starting stage of the ultrasonic atomizing sheet during operation, that is, at the time T0, the target operating power is set to the first power, wherein the first power is the maximum power of the ultrasonic atomizing sheet during operation.

It will be appreciated that the ultrasonic atomizer is in a stationary state prior to time T0. After the ultrasonic atomizer stands for a long time, a large amount of atomized liquid can be accumulated on the ultrasonic atomization sheet, the accumulated atomized liquid reduces the efficiency of converting the electric energy of the ultrasonic atomization sheet into mechanical energy, and the quality factor (Q value) is typically seriously reduced, the dynamic equivalent resistance is increased, and the related electric performance parameters are changed. Therefore, if the power is too low, the ultrasonic atomization sheet needs to throw away the accumulated excessive atomized liquid, so that the residual atomized liquid can be atomized further, the starting is slower, the first atomization amount is small, and the user experience is poor. Therefore, in order to quickly discharge the mist, the power needs to be quickly increased in a short time, so that the atomizer quickly sprays the atomized liquid, and quick atomization is realized. Therefore, the target working power is set to be the maximum power of the ultrasonic atomizing sheet in the working process at the just-started stage of the ultrasonic atomizing sheet, so that the ultrasonic atomizing sheet can be driven by the maximum voltage, and the first mouth can rapidly discharge fog. In the starting stage, the target working power is the same as the actual power, and is the maximum power of the ultrasonic atomization sheet in the working process. In addition, the first power may be set according to the practical application, and the embodiment of the present application is not limited thereto, for example, in an embodiment, in order to keep the first port capable of rapidly discharging mist, the first power may be set to be greater than 10W. In this embodiment, the atomized liquid may correspond to different products in different application scenarios, which is not particularly limited in this embodiment of the present application, for example, in an embodiment, in an application scenario of an electronic cigarette, the atomized liquid may be tobacco tar; for another example, in another embodiment, in an application scenario of the medical vaporizer, the atomizing sheet may be a liquid medicine inside the medical vaporizer.

Then, between the time T0 and the time T1, as the ultrasonic atomization sheet adopts the maximum power at the time T0, the ultrasonic atomization sheet has generated a temperature effect, the temperature rise is helpful for the activity of molecules of the atomized liquid, and the atomized liquid is accelerated to be atomized. In this case, if a large power is still applied to the ultrasonic atomizing plate, the temperature of the ultrasonic atomizing plate is further increased, which in turn leads to a high heating temperature of the ultrasonic atomizing plate, and even the ultrasonic atomizing plate may be burned out. Therefore, the power is reduced immediately, that is, the target operating power of the ultrasonic atomizing plate is gradually reduced until the stable stage in the operation process of the ultrasonic atomizing plate starts at the time T1. In other words, the target operating power of the ultrasonic atomizing plate exhibits a decreasing trend at a stage between the start-up stage and the steady stage in the operation of the ultrasonic atomizing plate. In the stage between the starting stage and the stabilizing stage, according to the set target working power, the actual working power of the ultrasonic atomizing sheet is also reduced, i.e. the target working power and the actual working power are both in a reduced trend.

At a stable stage in the working process of the ultrasonic atomization sheet, after the time T1, the target working power is a straight line as shown by a dotted line L2, namely the target working power is kept unchanged. For example, in one embodiment, the target operating power is set to any one of [6W,8W ]. However, in practical applications, after detecting the current flowing through the ultrasonic atomizing sheet and calculating the target operating voltage according to the target operating power, when the ultrasonic atomizing sheet is driven by the output target operating voltage, the current of the ultrasonic atomizing sheet may change again, so that the actual power of the ultrasonic atomizing sheet is larger or smaller than the target operating power. Then, it is necessary to detect again the current flowing through the ultrasonic atomizing plate and calculate a new target operating voltage to continue adjusting the operating power of the ultrasonic atomizing plate. The above-mentioned process is repeated continuously, and since the change speed of the current flowing through the ultrasonic atomizing plate is always faster than the change speed of the target operating voltage, the waveform of the actual operating power of the ultrasonic atomizing plate is caused to vibrate with a constant amplitude, and the specific waveform corresponds to the portion of the curve L1 after the time T1. In one embodiment, the fluctuation range of the actual operating power of the ultrasonic atomizing sheet is [ -2W,2W ], that is, the difference between the actual operating power of the ultrasonic atomizing sheet and the target operating power is in the range of [ -2W, +2W ], so that the actual operating power of the ultrasonic atomizing sheet is kept to fluctuate within a small range to keep the stable operation of the ultrasonic atomizing sheet.

It can be understood that, at the stable stage in the working process of the ultrasonic atomizing sheet, the temperature of the ultrasonic atomizing sheet may also gradually increase as the working proceeds, and then the target working power may be set to a gradually decreasing trend at this time so as to prevent the temperature of the ultrasonic atomizing sheet from being too high, thereby being capable of maintaining the stable operation of the ultrasonic atomizing sheet. For example, in another embodiment, the target operating power is set to maintain the first target operating power for a first period of time, and the second target operating power … for a second period of time, and the nth target operating power for an nth period of time. The time when the first time length ends is the time when the second time length starts, the time when the second time length ends is the time … when the third time length starts and the time when the N-1 time length ends is the time when the N time length starts, the first target working power is larger than the second target working power and larger than … N target working power, and N is an integer larger than 1.

In summary, in this embodiment, the target operating voltage can be obtained in real time by combining the current flowing through the ultrasonic atomizing plate with the target operating power, and the ultrasonic atomizing plate is driven with the target operating voltage. In other words, based on the current flowing through the ultrasonic atomizing sheet and the target working power, the corresponding voltage can be continuously matched for the ultrasonic atomizing sheet, and the actual working voltage curve of the ultrasonic atomizing sheet is a smooth curve, namely, in the adjustable range of the working voltage of the ultrasonic atomizing sheet, the ultrasonic atomizing sheet can be adjusted to any voltage, namely, the stepless voltage regulation of the ultrasonic atomizing sheet is realized, so that the actual working power of the ultrasonic atomizing sheet can be kept to fluctuate within a certain range. The fluctuation range is smaller, and the actual working power of the ultrasonic atomization sheet can be considered to be in a relatively stable state. Therefore, through the mode, the actual working power of the ultrasonic atomizing sheet can be controlled to be always kept at a smaller reasonable value, so that energy consumption can be saved, temperature rise can be reduced, the ultrasonic atomizing sheet can be always maintained to work near a series resonance frequency point, and the working efficiency of the ultrasonic atomizing sheet, namely the working efficiency of an ultrasonic atomizer, can be improved.

Meanwhile, in an embodiment, the adjusting range of the target working voltage is set to be a larger range so as to meet the working power requirements of different ultrasonic atomization sheets. For example, in one embodiment, the adjustment range of the target operating voltage is set to [3v,20v ], i.e., the target operating voltage is output in the range of [3v,20v ].

Referring to fig. 6, fig. 6 shows another method step that the control circuit 14 can perform, i.e. the control circuit 13 is configured to perform the following steps:

step 601: in the working process of the ultrasonic atomizing sheet, the current output by the power supply is obtained.

Step 602: and smoothly adjusting the voltage provided by the power supply according to the current output by the power supply so as to adjust the actual working power of the ultrasonic atomization sheet, thereby enabling the difference between the actual working power and the target working power to be in a first preset range.

Wherein the smooth regulation, i.e. the smooth continuous variation of the voltage supplied by the power supply, is possible to stabilize the output voltage at any point within the regulation range of the whole voltage.

In other words, by continuously adjusting the voltage provided by the power supply to provide different voltages for the ultrasonic atomization sheet, the actual working power of the ultrasonic atomization sheet can be controlled to continuously trend toward the target working power, so that the difference between the actual working power and the target working power is always within the first preset range. The first preset range may be set according to practical application conditions, which is not particularly limited in the embodiment of the present application. For example, still taking the actual working power and the target working power as shown in fig. 5 as an example, at the time T1, the difference between the actual working power and the target working power of the ultrasonic atomizing sheet can be within the range of [ -2W, +2W ] by adjusting the voltage provided by the power supply in real time, so that the actual working power of the ultrasonic atomizing sheet can be kept to fluctuate within a small range to keep the stable working of the ultrasonic atomizing sheet, and the purpose of keeping the ultrasonic atomizing sheet working near the series resonance frequency point is achieved.

It should be understood that, in this embodiment, the specific implementation process and the beneficial effects of the control circuit may refer to the corresponding descriptions in the method embodiment shown in fig. 3, and are not repeated herein for brevity.

Referring to fig. 7, fig. 7 is a flowchart of a power control method for ultrasonic atomization according to an embodiment of the application. The power control method of ultrasonic atomization is applied to an ultrasonic atomizer, and the ultrasonic atomizer comprises a liquid storage cavity for storing liquid matrix and an ultrasonic atomization sheet for generating oscillation to atomize the liquid matrix. Here, the structure of the ultrasonic atomizer may refer to the above detailed description with respect to fig. 1 to 2, and will not be repeated here. The power control method of ultrasonic atomization comprises the following steps:

step 701: the current flowing through the ultrasonic atomizing plate is obtained.

Step 702: and determining the target working voltage of the ultrasonic atomization sheet according to the current and the target working power.

Step 703: and outputting a target operating voltage.

In one embodiment, the method further comprises: outputting voltages of a plurality of frequencies in a preset frequency range to drive the ultrasonic atomization sheet; acquiring current flowing through the ultrasonic atomization sheet corresponding to each frequency; and determining the resonant frequency of the ultrasonic atomization sheet according to the current of the ultrasonic atomization sheet corresponding to each frequency.

In one embodiment, the method further comprises: at a start-up stage in the operation process of the ultrasonic atomization sheet, the target operating power is kept at a first power, and the first power is larger than 10W.

In one embodiment, the method further comprises: in a stable stage of the ultrasonic atomizing sheet in the working process, the target working power is any one value of [6W,8W ], and the difference between the actual working power of the ultrasonic atomizing sheet and the target working power is in the range of [ -2W, +2W ].

In one embodiment, the process of outputting the target operating voltage in step 703 includes the steps of: the target operating voltage is output in the range of [3V,20V ].

It should be understood that, in this embodiment, specific control of the ultrasonic atomizer and the beneficial effects thereof may refer to corresponding descriptions in the method embodiments shown in fig. 3 and fig. 6, and are not repeated herein for brevity.

In other embodiments, the control circuit 13 may also perform its function by means of a circuit configuration. Referring to fig. 8, one configuration of the control circuit 13 is exemplarily shown in fig. 8.

As shown in fig. 8, the control circuit 13 includes a controller 131, a switching branch 132, and a voltage converting branch 133.

The switch branch 132 is connected between the power source 14 and the voltage conversion branch 133, and the switch branch 132 is connected with the controller 131, and the voltage conversion branch 133 is connected with the ultrasonic atomizing sheet 12.

Specifically, the switching leg 132 is configured to be turned on in response to a first control signal output from the controller 131 to establish a connection between the power supply 14 and the voltage converting leg 133. The voltage conversion branch 133 is configured to boost the voltage of the power supply 14 and output an adjustable voltage to provide a target operating voltage for the ultrasonic atomizing plate 12.

In this embodiment, when the controller 131 outputs the first control signal, the switching branch 132 is turned on, and the power source 14 is in communication with the voltage converting branch 133. The voltage conversion branch 133 takes the voltage of the power supply 14 as an input voltage, and boosts the input voltage to output an adjustable voltage, so that the actual operating voltage of the ultrasonic atomizing sheet 12 can be adjusted in real time, so that the actual operating voltage of the ultrasonic atomizing sheet 12 is the target operating voltage of the ultrasonic atomizing sheet 12.

Among them, the controller 131 may employ a micro control unit (Microcontroller Unit, MCU) or a digital signal processing (Digital Signal Processing, DSP) controller, etc.

Also illustrated in fig. 9 is a structure of the controller 131, as illustrated in fig. 9, the controller 131 includes: at least one processor 901; and a memory 902 communicatively coupled to the at least one processor 901, one processor 901 being illustrated in fig. 8. The memory 902 stores instructions executable by the at least one processor 901, the instructions being executable by the at least one processor 901 to enable the at least one processor 901 to perform the methods illustrated in figures 3, 6 and 7 described above. The processor 901 and the memory 902 may be connected by a bus or otherwise, for example in fig. 9.

The memory 902 is a non-volatile computer-readable storage medium that can be used to store non-volatile software programs, non-volatile computer-executable programs, and modules. The processor 901 executes various functional applications of the server and data processing by executing nonvolatile software programs, instructions and modules stored in the memory 902, i.e., implements the methods shown in fig. 3, 6 and 7 described above.

The memory 902 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, at least one application program required for a function; the storage data area may store data created according to the use of the data transmission device, and the like. In addition, the memory 902 may include high-speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid-state storage device.

One or more modules are stored in the memory 902 that, when executed by the one or more processors 901, perform the methods of any of the method embodiments described above, e.g., perform the method steps shown in fig. 3, 6, and 7 described above.

Referring to fig. 10, one configuration of the switching leg 132 is schematically illustrated in fig. 10. As shown in fig. 10, the switch branch 132 includes a first switch Q1 and a second switch Q2.

The first switch Q1 is connected between the controller 131 and the second switch Q2, and one end of the first switch Q1 is grounded GND, and the first switch Q1 is configured to be turned on in response to a first control signal output by the controller 131, so as to establish a connection between the second switch Q2 and the ground GND. The second switch Q2 is connected between the power supply 14 and the voltage converting branch 133, and the second switch Q2 is configured to be turned on when the second switch Q2 is grounded GND to establish a connection between the power supply 14 and the voltage converting branch 133.

In this embodiment, the first switch Q1 is an N-type metal oxide semiconductor field effect transistor (hereinafter referred to as an NMOS transistor), and the second switch Q2 is a P-type metal oxide semiconductor field effect transistor (hereinafter referred to as a PMOS transistor).

The grid electrode of the NMOS tube is a first end of the first switch Q1, the source electrode of the NMOS tube is a second end of the first switch Q1, and the drain electrode of the NMOS tube is a third end of the first switch Q1. The grid electrode of the PMOS tube is the first end of the second switch Q2, the source electrode of the PMOS tube is the second end of the second switch Q2, and the drain electrode of the PMOS tube is the third end of the second switch Q2.

In addition, in other embodiments, the first switch Q1 and the second switch Q2 may be at least one of a metal-oxide semiconductor field effect transistor, an insulated gate bipolar transistor, an integrated gate commutated thyristor, a gate turn-off thyristor, a junction gate field effect transistor, a MOS controlled thyristor, a gallium nitride based power device, a silicon carbide based power device, a silicon controlled rectifier, and a signal relay.

In an embodiment, the third switching leg 138 further includes a third resistor R3 and a fourth resistor R4. The first end of the third resistor R3 is connected to the second end of the second switch Q2, the second end of the third resistor R3 is connected to the first end of the second switch Q2, the first end of the fourth resistor R4 is connected to the first end of the first switch Q1, and the second end of the fourth resistor R4 is grounded GND.

In this embodiment, when the controller 131 outputs the first control signal to the first switch Q1, the first switch Q1 is turned on. The first end of the second switch Q2 is grounded GND after passing through the first switch Q1, the second switch Q2 is turned on, and the power supply 14 is connected to the voltage conversion branch 133.

Referring to fig. 11, one configuration of the voltage conversion branch 133 is schematically shown in fig. 11. As shown in fig. 11, the voltage conversion branch 133 includes a first voltage conversion chip U1 and a first capacitor C1.

The first end of the first capacitor C1 is connected to the controller 131 and the feedback pin of the first voltage conversion chip U1 (the 5 th pin of the first voltage conversion chip U1), and the first capacitor C1 is configured to charge based on the pulse signal output by the controller 131 to generate an adjustable first voltage, so that the voltage output pin of the first voltage conversion chip U1 (the 6 th pin of the first voltage conversion chip U1) outputs the adjustable voltage. Wherein, the duty ratio of the pulse signal output by the controller 131 and the first voltage show positive correlation.

In an embodiment, the voltage conversion branch 133 further includes a fifth resistor R5, a sixth resistor R6, a seventh resistor R7, and an eighth resistor R8.

The fifth resistor R5, the sixth resistor R6 and the first capacitor C1 are sequentially connected in series, a connection point between the sixth resistor R6 and the first capacitor C1 is connected to the first end of the seventh resistor R7, the second end of the seventh resistor R7 is connected to the controller 131, the eighth resistor R8 is connected between the switch branch 132 and the enable pin of the first voltage conversion chip U1 (i.e., the 11 th pin of the first voltage conversion chip U1), and the voltage input pin of the first voltage conversion chip U1 (i.e., the 10 th pin of the first voltage conversion chip U1) is connected to the switch branch 132.

In this embodiment, in the controller 131 outputting a pulse signal (i.e. PWM square wave signal) with a certain frequency to the RC circuit (the resistor formed by the sixth resistor R6 and the first capacitor C1), a relatively stable voltage value VC1 (i.e. the first voltage) is obtained in the first capacitor C1, and the magnitude of the voltage value VC1 is determined by the duty ratio of the pulse signal. When the duty ratio of the pulse signal increases, the voltage value VC1 also increases; when the duty ratio of the pulse signal decreases, the voltage value VC1 also decreases, that is, the duty ratio of the pulse signal and the first voltage show a positive correlation.

The 6 th pin of the first voltage conversion chip U1) outputs an adjustable voltage VOUT as follows:

VOUT＝(VFB-VC1)*(r5+r6)/r6(1)

where VFB is a fixed value, and is a reference value of the feedback voltage in the first voltage conversion chip U1, R5 is a resistance value of the fifth resistor R5, and R6 is a resistance value of the sixth resistor R6. In this embodiment, only the voltage value VC1 needs to be satisfied as long as it is smaller than VFB, and different output voltage magnitudes can be obtained by dynamically adjusting the magnitude of the voltage value VC 1. The magnitude of the voltage VC1 depends on the duty cycle of the pulse signal of the controller 131, i.e. by dynamically adjusting the duty cycle of the pulse signal of the controller 131, different magnitudes of the output voltage can be obtained. Meanwhile, as can be seen from equation (1), the voltage value VC1 and the magnitude of the output voltage show a negative correlation, i.e. the output voltage decreases with increasing voltage value VC1, and the output voltage increases with decreasing voltage value VC 1.

For example, when the output voltage of the voltage output pin of the first voltage conversion chip U1 needs to be increased, the controller 131 needs to adjust the duty ratio of the pulse signal to be decreased; when the output voltage of the voltage output pin of the first voltage conversion chip U1 needs to be reduced, the controller 131 needs to adjust the duty ratio of the pulse signal to be increased.

In summary, in this embodiment, by dynamically adjusting the duty ratio of the pulse signal of the controller 131, the voltage output pins of the first voltage conversion chip U1 can be made to output voltages of different magnitudes. In addition, since the adjusting range of the pulse signal of the controller 131 is large, a myriad of different output voltages can be obtained, thereby realizing the function of stepless voltage regulation and realizing the function of dynamically adjusting power through one part.

In an embodiment, referring to fig. 11, the control circuit 13 further includes a voltage detection branch 134. Wherein the voltage detection branch 134 is connected to the voltage conversion branch 133.

Specifically, the voltage detection branch 134 is configured to output a voltage detection signal in response to the voltage output by the voltage conversion branch 133, and input to the controller 131, so that the controller 131 adjusts the voltage output by the voltage conversion branch 133 in real time based on the target operating voltage.

Also illustrated in fig. 11 is a structure of the voltage detection branch 134, and as illustrated in fig. 11, the voltage detection branch 134 includes a first resistor R1, a second resistor R2, and a second capacitor C2.

The first end of the first resistor R1 is connected to the voltage converting branch 133, and the second end of the first resistor R1 is connected to the first end of the second resistor R2, the first end of the second capacitor C2, and the controller 131, and the second end of the second resistor R2 and the second end of the second capacitor C2 are grounded GND.

Specifically, the first resistor R1 and the second resistor R2 are used for dividing the voltage output by the voltage output pin of the first voltage conversion chip U1, and the second capacitor C2 is used for filtering the divided voltage on the second resistor R2.

In this embodiment, the controller 131 determines the voltage output by the voltage conversion branch 133 (i.e., the voltage output by the voltage output pin of the first voltage conversion chip U1) in real time through the voltage detection signal, and then can determine whether the voltage output by the voltage conversion branch 133 can reach the target operating voltage. When the voltage output by the voltage conversion branch 133 is less than the target operating voltage, the controller 131 adjusts the pulse signal output by the voltage conversion branch 133 to decrease so as to increase the voltage output by the voltage conversion branch 133 until the voltage output by the voltage conversion branch 133 is equal to the target operating voltage; when the voltage output by the voltage conversion branch 133 is greater than the target operating voltage, the controller 131 adjusts the pulse signal output by the voltage conversion branch 133 to increase so as to decrease the voltage output by the voltage conversion branch 133 until the voltage output by the voltage conversion branch 133 is equal to the target operating voltage.

It should be noted that the hardware configuration of the voltage conversion branch 133 as shown in fig. 11 is only one example, and the voltage conversion branch 133 may have more or fewer components than shown in the drawing, may combine two or more components, or may have different component configurations, and various components shown in the drawing may be implemented in hardware, software, or a combination of hardware and software including one or more signal processing and/or application specific integrated circuits.

In another embodiment, the voltage conversion branch 133 may also be implemented by a variable resistor. As shown in fig. 12, the voltage conversion branch circuit includes a second voltage conversion chip U2 and a variable resistor RL.

Wherein, the first end of the variable resistor RL is connected with the feedback pin of the second voltage conversion chip U2, and the variable resistor RL is configured to adjust the resistance value based on the second control signal output by the controller 131 to adjust the voltage output by the voltage output pin of the second voltage conversion chip U2. The resistance value of the variable resistor RL and the voltage output by the voltage output pin input to the second voltage conversion chip U2 show a negative correlation.

Specifically, when the resistance value of the variable resistor RL increases, since the reference value of the feedback voltage inside the second voltage conversion chip U2 remains unchanged, that is, the voltage on the feedback pin of the second voltage conversion chip U2 (the 5 th pin of the second voltage conversion chip U2) remains unchanged, the currents flowing through the fifth resistor R5, the sixth resistor R6 and the variable resistor RL all decrease, the voltage drop across the fifth resistor R5 decreases, and the voltage output by the voltage output pin of the second voltage conversion chip U2 is the sum of the voltage (remaining unchanged) across the 5 th pin of the second voltage conversion chip U2 and the voltage drop (decrease) across the fifth resistor R5, so the voltage output by the voltage output pin of the second voltage conversion chip U2 decreases; conversely, when the resistance value of the variable resistor RL decreases, the voltage output by the voltage output pin of the second voltage conversion chip U2 increases based on a similar analysis process. That is, the resistance value of the variable resistor RL and the voltage output from the voltage output pin input to the second voltage conversion chip U2 show a negative correlation, and thus, the controller 131 can realize stepless adjustment of the voltage output from the voltage output pin of the second voltage conversion chip U2 by adjusting the resistance value of the variable resistor RL.

In one embodiment, as shown in fig. 13, the control circuit 13 further includes a capacitive branch 135 and an inductive branch 136. The capacitive branch 135 is connected in series with the ultrasonic atomizing plate 12 to form a first circuit A1, and the inductive branch 136 is connected with the first circuit A2 and the second circuit A2.

Wherein, the capacitance branch 135 and the inductance branch 136 are used for switching the impedance characteristic of the second circuit A2 to the inductance when the ultrasonic atomizing sheet 12 works at the series resonance point, so that the phase difference between the working current and the working voltage of the ultrasonic atomizing sheet 12 is smaller than 40 DEG

In the embodiment of the present application, by adding the capacitive branch 135 and the inductive branch 136, the characteristic of unstable equivalent capacitance of the ultrasonic atomizing plate 12 can be overcome, and the impedance characteristic of the second circuit A2 is effectively kept as an inductance, so that the phase difference between the working voltage and the working current on the ultrasonic atomizing plate 12 is smaller, and even the same phase can be kept. In turn, the heating power on the ultrasonic atomizing sheet 12 can be reduced, that is, the heating temperature of the ultrasonic atomizing sheet 12 is reduced, and meanwhile, the useful power on the ultrasonic atomizing sheet 12 is increased, so that the working efficiency of the ultrasonic atomizing sheet 12 is improved as a whole.

At the same time, since the impedance characteristic of the second circuit A2 remains inductive, it can block the change of current for an inductive load.

Thus, on the one hand, during the start-up of the ultrasonic atomizing device 100, there is no large overshoot current. For example, the operating voltage of the just-activated stage of the ultrasonic atomizing plate 12 may be set to the maximum value of the operating voltage of the entire operating period, and then the ultrasonic atomizing plate 12 can be driven at the maximum voltage. Therefore, in the just-started stage of the ultrasonic atomization sheet 12, a slow start mode, namely a mode of gradually increasing the voltage in the starting process, is not needed, so that the control difficulty can be reduced, and the first-mouth mist can be quickly discharged.

On the other hand, as the change of the current is hindered, that is, the change rate of the current is slowed down, the change speed of the voltage can be further close to the change speed of the current, and the quick adjustment of the working power of the ultrasonic atomizing sheet 12 is facilitated, so that the actual working power and the target working power of the ultrasonic atomizing sheet 12 can be kept in a smaller range, the actual working power of the ultrasonic atomizing sheet can be kept at a smaller reasonable value all the time, the energy consumption can be saved, the temperature rise can be reduced, and the ultrasonic atomizing sheet can be kept to work near the series resonance frequency point all the time, so that the working efficiency of the ultrasonic atomizing sheet is improved, that is, the working efficiency of the ultrasonic atomizer is improved.

In one embodiment, the capacitive branch 135 is configured such that the capacitance of the capacitive branch 135 is less than the capacitance of the equivalent capacitance of the ultrasonic atomizing plate 12 when operating at the series resonant frequency point.

In this embodiment, the capacitance of the capacitor branch 135 is configured to be smaller than the capacitance of the equivalent capacitor when the ultrasonic atomizing plate 12 operates at the series resonance frequency point, and since the total capacitance of the series capacitors is necessarily smaller than the capacitance of any one of the series capacitors, the capacitance of the equivalent capacitor of the final first circuit A1 is necessarily a value smaller than the capacitance of the capacitor branch 1331 regardless of the ultrasonic atomizing plate 12 selected. For example, in one embodiment, the equivalent capacitance of the ultrasonic atomizing plate 12 when operating at the series resonant frequency point is 5.9nF, and the capacitance of the capacitive branch 1331 is configured to be 4.7nF, then the equivalent capacitance of the first circuit A1 is, for example, less than 4.7nF.

Then, by selecting the suitable capacitor branch 135, the capacitance value of the equivalent capacitor of the first circuit A1 can be configured to be a required value, that is, the capacitance value of the equivalent capacitor of the first circuit A1 is a controllable value, so that the user can perform corresponding configuration according to different application scenarios, and the practicability is high.

In this case, it can be determined that the capacitance value of the equivalent capacitance of the first circuit A1 is necessarily smaller than the capacitance value of the capacitance branch 135. In an embodiment, the capacitance of the capacitive branch 135 may be taken as the maximum value of the equivalent capacitance of the first circuit A1, and the minimum value of the inductance of the inductive branch 136 may be calculated according to the condition that the impedance characteristic of the second circuit A2 is switched to be inductive. Then, the inductance value of the actually used inductance branch 136 is set to be greater than or equal to the minimum value, so that the impedance characteristic of the second circuit A2 can be always kept as inductive no matter how the capacitance value of the equivalent capacitance of the ultrasonic atomizing plate 12 changes, the capacitance value of the equivalent capacitance of the first circuit A1 is always smaller than the capacitance value of the capacitance branch 136.

Referring to fig. 14, fig. 14 illustrates one structure of a capacitive branch 135 and an inductive branch 136. As shown in fig. 14, the capacitor branch 135 includes a third capacitor C3, and the inductor branch 136 includes a first inductor L1.

Wherein a third capacitor C3 is connected in series with the ultrasonic atomizing plate 12. The first capacitor C1 may be disposed on the left side of the ultrasonic atomizing sheet 12 or on the right side of the ultrasonic atomizing sheet 12, which is not particularly limited in the embodiment of the present application.

The first inductor L1 may be connected in parallel with the first circuit A1 (i.e., a circuit formed by connecting the first capacitor C1 in series with the ultrasonic atomizing plate 12), as shown in part (a) of fig. 14.

Alternatively, the first inductor L1 is connected in series with the third capacitor C3 and the ultrasonic atomizing plate 12. Specifically, the first inductor L1 is connected in series with the first circuit A1, and the first inductor L1 is disposed on the left side or the right side (not shown) of the first circuit A1; or the first inductance L1 is connected between the capacitive branch 135 and the ultrasonic atomizing plate 12, as shown in part (b) of fig. 14. The interface J1 and the interface J2 are used for connecting with the rest of the circuit structures in the control circuit 13.

In one embodiment, the capacitance of the third capacitor C3 is any one of [1nF,20nF ]. In this embodiment, an ultrasonic atomizing plate 12 having a vibration frequency of 3MHz should be generally selected. In other embodiments, the capacitance of the third capacitor C3 may be set correspondingly according to practical situations, for example, in an embodiment, if other vibration frequencies (e.g. 2.7 MHz) are selected, the selected value range of the third capacitor C3 should be modified.

It should be noted that, in this embodiment, the range of the third capacitor C3 may be obtained by testing different ultrasonic atomizing sheets 12, so that when the third capacitor C3 is used, even if the capacitance of the equivalent capacitor of the ultrasonic atomizing sheet 12 changes during the working process, or the individual performances of the ultrasonic atomizing sheets 12 are different, the safety and reliability of the ultrasonic atomizing sheet 12 during the use process can be ensured.

In this embodiment, by setting the capacitance value of the third capacitor C3 to any one of [1nf,20nf ], on the one hand, it is possible to prevent an abnormal phenomenon in which the current flowing through the ultrasonic atomizing plate 12 is small due to the setting of the third capacitor C3 being too small; on the other hand, the abnormal phenomena of serious heating or inconsistent atomization performance of the ultrasonic atomization sheet 12 caused by the parameter change of the ultrasonic atomization sheet 12 in the working process or the different individual performances of different ultrasonic atomization sheets 12 can be effectively prevented. Therefore, for the ultrasonic atomizing plate 12 with the vibration frequency of 3MHz, the capacitance range [1nF,20nF ] of the third capacitor C3 is a more reasonable range, so that the heating temperature of the ultrasonic atomizing plate 12 is reduced, and the ultrasonic atomizing plate is applicable to different ultrasonic atomizing plates 12 with the vibration frequency of 3 MHz.

In an embodiment, when the first inductor L1 may be connected in parallel with the first circuit A1, the inductance value of the first inductor L1 is any one of [0.1 μh,2 μh ]. In this embodiment, the ultrasonic atomizing plate 12 having a vibration frequency of 3MHz is taken as an example. In this other embodiment, the inductance value of the first inductor L1 may be set correspondingly according to the practical situation (for example, the vibration frequency of the ultrasonic atomizing sheet 12 used).

In this embodiment, by setting the lower limit value of the inductance value of the first inductance L1 to 0.1 μh, it is ensured that the first inductance L1 can switch the impedance characteristic of the second circuit A2 as a whole to an inductance so that the phase between the operating voltage and the operating current applied to the ultrasonic atomizing sheet 12 is in a smaller range, thereby improving the efficiency of the power supply 14 and reducing the heat generation power on the ultrasonic atomizing sheet 12 to reduce the heat generation temperature of the ultrasonic atomizing sheet 12. Meanwhile, by setting the upper limit value of the inductance value of the first inductance L1 to 2 μh, it is possible to prevent an abnormal phenomenon in which the blocking force of the second circuit A2 on the alternating current is excessively large to cause the alternating current to flow excessively small and the available power obtained on the ultrasonic atomizing plate 12 is excessively small, to maintain the efficiency of the power supply 14.

In another embodiment, when the first inductor L1 is connected in series with the third capacitor C3 and the ultrasonic atomizing plate 12, the inductance value of the first inductor L1 is any one of [1 μh,4.7 μh ]. The specific implementation process is similar to the above embodiment, and is within the scope of those skilled in the art, and will not be repeated here.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and are not limiting; the technical features of the above embodiments or in the different embodiments may also be combined within the idea of the application, the steps may be implemented in any order, and there are many other variations of the different aspects of the application as described above, which are not provided in detail for the sake of brevity; although the application has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the application.

Claims

1. An ultrasonic atomizer, comprising:

A liquid storage chamber for storing a liquid matrix;

a control circuit and a power supply;

wherein the control circuit is configured to:

2. The ultrasonic atomizer of claim 1 wherein said target operating power is maintained at a first power during start-up phase of operation of said ultrasonic atomizing plate, wherein said first power is a maximum power of said ultrasonic atomizing plate during operation.

3. The ultrasonic atomizer of claim 1 wherein the target operating power of said ultrasonic atomizing plate exhibits a decreasing trend between a start-up phase and a steady-state phase during operation of said ultrasonic atomizing plate.

4. The ultrasonic atomizer of claim 1 wherein the waveform of the actual operating power of said ultrasonic atomizing plate is a constant amplitude oscillation at a steady stage during operation of said ultrasonic atomizing plate.

5. The ultrasonic atomizer of any one of claims 1-4 wherein said control circuit comprises a controller, a switching leg and a voltage conversion leg;

6. The ultrasonic atomizer of claim 5 wherein said switch bypass comprises a first switch and a second switch;

7. The ultrasonic atomizer of claim 5 wherein said voltage conversion branch comprises a first voltage conversion chip and a first capacitor;

8. The ultrasonic atomizer of claim 5 wherein said voltage conversion branch comprises a second voltage conversion chip and a variable resistor;

9. The ultrasonic nebulizer of claim 5, wherein the control circuit further comprises a voltage detection branch;

10. The ultrasonic nebulizer of claim 9, wherein the voltage detection branch comprises a first resistor, a second resistor, and a second capacitor;

11. The ultrasonic atomizer of any one of claims 1 to 4 wherein said control circuit further comprises a capacitive branch connected in series with said ultrasonic atomizing plate to form a first circuit and an inductive branch connected to said first circuit to form a second circuit;

12. The ultrasonic atomizer of claim 11 wherein said capacitive branch is configured such that the capacitance of said capacitive branch is less than the capacitance of an equivalent capacitance of said ultrasonic atomizing plate when operating at a series resonant frequency.

13. The ultrasonic atomizer of claim 11 wherein said capacitive branch comprises a third capacitance, said inductive branch comprising a first inductance;

14. An ultrasonic atomizer, comprising:

a liquid storage chamber for storing a liquid matrix;

a control circuit and a power supply;

wherein the control circuit is configured to:

15. A power control method of ultrasonic atomization, characterized by being applied to an ultrasonic atomizer including a liquid storage chamber for storing a liquid matrix, and an ultrasonic atomization plate for generating oscillation to atomize the liquid matrix, the method comprising:

acquiring current flowing through the ultrasonic atomization sheet;

and outputting the target working voltage.

16. The method of claim 15, wherein the method further comprises:

17. The method of claim 15, wherein the method further comprises:

18. The method of claim 15, wherein the method further comprises:

19. The method of claim 15, wherein the outputting the target operating voltage comprises:

the target operating voltage is output in the range of [3v,20v ].