CN218048634U

CN218048634U - Ultrasonic atomizer

Info

Publication number: CN218048634U
Application number: CN202222144809.4U
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: 2022-08-15
Filing date: 2022-08-15
Publication date: 2022-12-16
Anticipated expiration: 2032-08-15

Abstract

The application discloses ultrasonic atomizer, ultrasonic atomizer includes stock solution chamber, ultrasonic atomization piece, control circuit and power. The liquid storage cavity is used for storing liquid matrix, and the ultrasonic atomization sheet is used for generating oscillation to atomize the liquid matrix. The control circuit comprises a controller, a driving branch circuit, N first switch branch circuits and N impedance branch circuits. The driving branch circuit is respectively connected with the power supply and the controller, and the driving branch circuit responds to the first pulse signal to generate driving voltage. The driving branch is connected with the ultrasonic atomization sheet after passing through the first switch branch and the impedance branch, the first switch branch is also connected with the controller, and N is an integer more than or equal to 2. The controller is used for outputting a first pulse signal, controlling the target first switch branch in the N first switch branches to be connected and controlling other first switch branches to be disconnected, so that the combined impedance of the first impedance branch and the ultrasonic atomization sheet is matched with the impedance of the driving branch. Through the mode, the working efficiency of the ultrasonic atomizer can be improved.

Description

Ultrasonic atomizer

Technical Field

The present application relates to the field of electronic circuit technology, and more particularly, to an ultrasonic atomizer.

Background

In daily life, the ultrasonic atomizer can be used in the fields of humidification, flavoring, sterilization, decoration, medical atomization, electronic cigarettes and the like.

In the prior art, when the ultrasonic atomization plate is driven, because the ultrasonic atomization plate is a capacitive load, and a power supply for driving the ultrasonic atomization plate is output in a pure resistive manner, when energy is transmitted between the ultrasonic atomization plate and the power supply, a large useless power is generated on a driving circuit, that is, extra energy loss is large, so that the working efficiency of the ultrasonic atomizer is low.

SUMMERY OF THE UTILITY MODEL

The application aims at providing an ultrasonic atomizer, can promote ultrasonic atomizer's work efficiency.

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

the liquid storage cavity is used for storing liquid matrix;

an ultrasonic atomization patch for generating an oscillation to atomize the liquid matrix;

a control circuit and a power supply;

wherein the control circuit comprises:

the controller and the driving branch circuit are respectively connected with the power supply and the controller, the driving branch circuit is used for responding to a first pulse signal to generate a driving voltage, and the driving voltage is used for driving the ultrasonic atomization sheet;

the driving branch is connected with the ultrasonic atomization sheet after passing through the first switch branch and the impedance branch in sequence, the first switch branch is also connected with the controller, and N is an integer greater than or equal to 2;

the controller is used for outputting the first pulse signal, controlling the target first switch branch in the N first switch branches to be connected, and controlling other first switch branches to be disconnected, so that the combined impedance of the first impedance branch and the ultrasonic atomization sheet is matched with the impedance of the driving branch, wherein the first impedance branch is connected with the connected first switch branch.

In an optional manner, one end of the impedance branch is grounded, the control circuit further includes N second switch branches, one of the second switch branches is connected between one of the impedance branches and the ultrasonic atomization sheet, and the second switch branch is further connected to the controller;

the controller is further used for controlling the conduction of a second switch branch circuit connected with the first impedance branch circuit, so that the impedance of the combination of the first impedance branch circuit and the ultrasonic atomization sheet is matched with the impedance of the driving branch circuit.

In an optional manner, the first switching branch and the second switching branch each include: at least one of a relay, a triode, or a MOSFET.

In an alternative mode, the combined impedance of the first impedance branch and the ultrasonic atomization plate includes a real impedance part and an imaginary impedance part, and when the real impedance part is equal to the impedance of the driving branch and the imaginary impedance part is smaller than a first preset threshold, the impedance of the combination of the first impedance branch and the ultrasonic atomization plate is matched with the impedance of the driving branch.

In an optional mode, the control circuit further comprises a current detection branch circuit;

the current detection branch is respectively connected with the power supply, the driving branch and the controller, and is used for detecting the output current of the power supply to generate a first detection signal;

the controller is further configured to: determining the output current of the power supply according to the first detection signal, determining an impedance interval corresponding to the output current according to the output current, a preset corresponding relationship between the current and the impedance interval, and determining the first impedance branch according to the impedance interval corresponding to the output current so as to control the conduction of a first switch branch connected with the first impedance branch.

In an optional mode, the current detection branch comprises an amplifier and a first resistor, the first resistor is respectively connected with the amplifier, the power supply and the ultrasonic atomization sheet, and the amplifier is connected with the controller;

the amplifier is used for outputting the first detection signal to the controller according to the voltage at two ends of the first resistor, so that the controller determines the output current of the power supply according to the first detection signal

In an alternative form, the drive branch comprises:

the power supply sub-branch is connected with the power supply and used for generating a direct-current power supply according to the power supply;

the switch sub-branch is respectively connected with the controller and the power supply sub-branch and is used for responding to the first pulse signal to be switched on and switched off so as to generate pulse voltage according to the direct-current power supply;

and the harmonic oscillator branch circuit is respectively connected with the power supply branch circuit and the switch branch circuit and is used for responding to the connection and disconnection of the switch branch circuit to resonate so as to output and drive the driving voltage according to the pulse voltage.

In an alternative form, the power supply sub-branch comprises a first inductance;

the first end of the first inductor is connected with the power supply, and the second end of the first inductor is connected with the switch sub-branch and the harmonic oscillator sub-branch respectively.

In an alternative mode, the switch sub-branch comprises a switch tube;

the first end of the switching tube is connected with the controller, the second end of the switching tube is grounded, and the third end of the switching tube is respectively connected with the power supply sub-branch and the harmonic oscillator sub-branch.

In an optional manner, the switch sub-branch further includes a first capacitor, a first end of the first capacitor is connected to the third end of the switching tube, and a second end of the first capacitor is grounded;

the first capacitor is used for charging when the switching tube is switched off and the current flowing through the harmonic oscillator branch is smaller than a first current threshold value, and is used for resonating with the harmonic oscillator branch to discharge when the switching tube is switched off and the current flowing through the harmonic oscillator branch is larger than or equal to the first current threshold value;

when the first capacitor discharges to a second current threshold value, the switch tube is conducted.

In an optional mode, the resonator branch includes a second capacitor and a second inductor;

the first end of the second capacitor is connected with the power supply sub-branch and the switch sub-branch respectively, the second end of the second capacitor is connected with the first end of the second inductor, and the second end of the second inductor is connected with the first switch branch.

In an alternative, the first switching leg comprises a first switch;

the first switch is connected between the driving branch and the impedance branch.

In an alternative form, the impedance branch includes a third inductance;

the third inductor is connected between the first switch branch and the ultrasonic atomization sheet.

In an optional manner, the impedance branch includes a fourth inductor, a third capacitor, and a fifth inductor;

the first end of the fourth inductor is connected with the first switch branch circuit, the second end of the fourth inductor is respectively connected with the first end of the third capacitor and the first end of the fifth inductor, the second end of the third capacitor is grounded, and the second end of the fifth inductor is connected with the second switch branch circuit.

In an alternative, the second switching leg comprises a second switch;

the second switch is connected between the impedance branch and the ultrasonic atomization sheet.

In a second aspect, the present application provides an impedance matching method for an ultrasonic nebulizer, comprising:

determining a first impedance branch matched with the impedance of an ultrasonic atomization sheet in the ultrasonic atomizer;

connecting the first impedance branch circuit between the ultrasonic atomization sheet and a drive circuit so as to enable the combined impedance of the first impedance branch circuit and the ultrasonic atomization sheet to be matched with the impedance of the drive circuit, wherein the drive circuit is a circuit for driving the ultrasonic atomization sheet.

In an alternative mode, the determining a first impedance branch matching the impedance of an ultrasonic atomization sheet in the ultrasonic atomizer includes:

acquiring a first current, wherein the first current is a current output by a power supply in an ultrasonic atomizer when the ultrasonic atomization sheet works at a resonance frequency;

determining an impedance interval corresponding to the first current according to the corresponding relation among the first current, preset current and impedance interval;

and determining an impedance branch circuit matched with the impedance interval according to the impedance interval so as to determine a first impedance branch circuit matched with the impedance of an ultrasonic atomization sheet in the ultrasonic atomizer.

The beneficial effect of this application is: the application provides an ultrasonic nebulizer includes stock solution chamber, ultrasonic atomization piece, control circuit and power. The liquid storage cavity is used for storing liquid matrix, and the ultrasonic atomization sheet is used for generating oscillation to atomize the liquid matrix. The control circuit comprises a controller, a driving branch circuit, N first switch branch circuits and N impedance branch circuits. The driving branch circuit is respectively connected with the power supply and the controller, and is used for responding to the first pulse signal to generate driving voltage which is used for driving the ultrasonic atomization sheet. The driving branch is connected with the ultrasonic atomization sheet after passing through a first switch branch and an impedance branch in sequence, the first switch branch is also connected with the controller, and N is an integer more than or equal to 2. The controller is used for outputting a first pulse signal, controlling a target first switch branch in the N first switch branches to be connected, and controlling other first switch branches to be disconnected, so that the combined impedance of the first impedance branch and the ultrasonic atomization sheet is matched with the impedance of the driving branch, wherein the first impedance branch is connected with the connected first switch branch. Therefore, by the mode, the corresponding first impedance branch can be matched for the ultrasonic atomization sheet according to different ultrasonic atomization sheets, so that the reactive power part of the combination of the first impedance branch and the ultrasonic atomization sheet is reduced, the power loss is reduced, the efficiency of driving the ultrasonic atomization sheet is improved, and the working efficiency of the ultrasonic atomizer is also improved.

Drawings

One or more embodiments are illustrated by way of example in the accompanying drawings which correspond to and are not to be construed as limiting the embodiments, in which elements having the same reference numeral designations represent like elements throughout, and in which the drawings are not to be construed as limiting in scale unless otherwise specified.

FIG. 1 is a schematic structural diagram of an ultrasonic atomizer provided in an embodiment of the present application;

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

fig. 3 is a schematic structural diagram of a control circuit according to an embodiment of the present disclosure;

fig. 4 is a schematic structural diagram of a control circuit according to another embodiment of the present application;

fig. 5 is a schematic structural diagram of a control circuit according to yet another embodiment of the present disclosure;

fig. 6 is a schematic circuit structure diagram of a current detection circuit according to an embodiment of the present disclosure;

fig. 7 is a schematic circuit structure diagram of a first switching branch and a driving branch according to an embodiment of the present disclosure;

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

fig. 9 is a schematic circuit structure diagram of a first switching branch, a second switching branch and a driving branch according to an embodiment of the present application;

fig. 10 is a schematic circuit diagram of a first switching branch, a second switching branch and a driving branch according to another embodiment of the present application;

fig. 11 is a schematic circuit structure diagram of a first switching branch, a second switching branch and a driving branch according to yet another embodiment of the present application;

fig. 12 is a flowchart of an impedance identification method provided in an embodiment of the present application;

FIG. 13 is a schematic diagram illustrating an implementation of step 1201 shown in FIG. 12, as disclosed in an embodiment of the present application.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

Referring to fig. 1, fig. 1 is a schematic structural diagram of an ultrasonic atomizer according to an embodiment of the present disclosure. As shown in fig. 1, the ultrasonic atomizer 100 includes a liquid storage chamber 11, an ultrasonic atomizing sheet 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 different usage scenarios, for example in the field of e-smoking, nicotine and/or a fragrance and/or an aerosol generating substance (e.g. glycerol); also as in the medical nebulization field, solvents such as drugs and/or physiological saline that have disease treatment or are beneficial to health may be included.

The ultrasonic atomization piece 12 is in fluid communication with the liquid storage cavity 11, the ultrasonic atomization piece 12 can be directly arranged in the liquid storage cavity 11, the atomization cavity in which the ultrasonic atomization piece 12 is arranged can be directly communicated with the liquid storage cavity 11, and liquid transmission can be carried out between the ultrasonic atomization piece 12 and the liquid storage cavity 11 through a liquid absorbing medium. The ultrasonic atomization sheet 12 is used to generate oscillations to atomize the liquid substrate, i.e. to atomize the liquid substrate transferred onto or near the ultrasonic atomization sheet 12 into an aerosol by vibration. Specifically, the ultrasonic atomization sheet 12 breaks up the liquid matrix by high-frequency vibration (preferably vibration frequency is 1.7 MHz-4.0 MHz, and the frequency range exceeds the human hearing range and belongs to the ultrasonic frequency band) in use to generate aerosol with naturally suspended particles.

The control circuit 13 is electrically connected to the ultrasonic atomization sheet 12, and the control circuit 13 is configured to provide a driving voltage and a driving current for the ultrasonic atomization sheet 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, which is not limited herein. In terms of scale, the battery in the embodiment of the present application may be a single battery cell, or may be a battery module formed by connecting multiple 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 less elements, or have different element configurations, which is not limited by the embodiments of the present application.

In one embodiment, the ultrasonic atomizer 100 further comprises a liquid transfer medium 15, an air outlet channel 16. Wherein the liquid transfer member 15 is used for transferring the liquid matrix between the liquid storage chamber 11 and the ultrasonic atomization sheet 12. The outlet passage 16 is for outputting the inhalable vapor or aerosol produced by the liquid substrate for inhalation by the user.

The ultrasonic atomizer 100 may be one-piece or assembled. In one embodiment, when the ultrasonic atomizer 100 is assembled, the ultrasonic atomizer 100 further comprises a power supply mechanism and the ultrasonic atomizer, wherein the ultrasonic atomizer comprises the first housing 17 and the power supply mechanism comprises the 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 through a snap structure or a magnetic attraction structure. The first housing 17 and the second housing 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 relationship with the second housing 18. Various mechanisms may be utilized to connect the second housing 18 to the first housing 17, resulting in a threaded engagement, a press-fit engagement, an interference fit, a magnetic engagement, and the like. In some embodiments, the ultrasonic atomizer 100 may be substantially rod-shaped, oblate-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 and

second housings

17 and 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-plated plastics), ceramics, and the like.

It should be noted that the hardware configuration of the ultrasonic nebulizer 100 as shown in fig. 1 is merely an example, and that the ultrasonic nebulizer 100 may have more or less components than shown in the figures, may combine two or more components, or may have a different configuration of components, and that the various components shown in the figures 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 atomization sheet 12 may be provided in the reservoir chamber 11, and the structure may be simplified.

Meanwhile, it is understood that the ultrasonic atomizer 100 shown in fig. 1 or fig. 2 can be applied to a variety of different occasions and can perform different functions, and the embodiments of the present application do not specifically limit this. For example, in an embodiment, the ultrasonic nebulizer 100 is applied to the medical field, in this case, the ultrasonic nebulizer 100 may be a medical nebulizer, which can achieve the effect of assisting the treatment by nebulizing the liquid medicine added to the inside thereof and enabling the patient to inhale the liquid medicine. For another example, in another embodiment, the ultrasonic atomizer 100 may also be used as an electronic product, such as an electronic cigarette, which is an electronic product that changes nicotine solution and the like into aerosol through atomization and the like, and then is provided for a user to inhale.

Referring to fig. 3, fig. 3 is a schematic structural diagram illustrating the connection between the control circuit 13 and the power source 14 and the ultrasonic atomization plate 12. As shown in fig. 3, the control circuit 13 includes a controller 131, a driving branch 132, N first switching branches, and N impedance branches.

The driving branch 132 is connected to the power supply 14 and the controller 131. The driving branch 132 is connected with the ultrasonic atomization sheet 12 after passing through a first switch branch and an impedance branch in sequence, the N first switch branches are further connected with the controller, and N is an integer greater than or equal to 2. The N first switch branches comprise a first switch branch K11 and a first switch branch K12 \8230, the N impedance branches comprise AN impedance branch A1 and AN impedance branch A2 \8230, and the impedance branch AN. The driving branch 132 is connected to the ultrasonic atomization sheet 12 through the first switch branch K11 and the impedance branch A1; the driving branch 132 is connected to the ultrasonic atomization sheet 12 \8230throughthe first switch branch K12 and the impedance branch A2, and the driving branch 132 is connected to the ultrasonic atomization sheet 12 through the first switch branch K1N and the impedance branch AN. The controller 131 is respectively connected to the first switching branch K11, the first switching branch K12 \8230andthe first switching branch K1N.

Specifically, the controller 131 is configured to output a first pulse signal, and the driving branch 132 is configured to generate a driving voltage in response to the first pulse signal, the driving voltage being used to drive the ultrasonic atomization sheet 12. The controller 131 is further configured to control a target first switch branch of the N first switch branches to be turned on, and control other first switch branches to be turned off, so that a combined impedance of the first impedance branch and the ultrasonic atomization plate 12 matches an impedance of the driving branch 132, where the first impedance branch is connected to the turned on first switch branch.

For example, in an embodiment, the target first switching branch is the first switching branch K11, and then the controller 131 controls the first switching branch K11 to be turned on, and controls the first switching branch K12 and the first switching branch K13 \8230, and the first switching branch K1N to be turned off. Then, a path is formed between the driving branch 132, the first switching branch K11, the impedance branch A1 and the ultrasonic atomization sheet 12, and the combined impedance of the impedance branch A1 and the ultrasonic atomization sheet 12 is matched with the impedance of the driving branch 132. The impedance branch A1 is a first impedance branch.

In practical applications, on one hand, the ultrasonic atomization plate 12 may be equivalent to a capacitive load, and the driving branch 132 is a pure resistive output, and if energy transmission is directly performed between the two (i.e., the capacitive load and the pure resistive output), a larger reactive power is generated, thereby greatly reducing the efficiency of driving the ultrasonic atomization plate 12. Based on this, by matching the impedance of the combination of the first impedance branch and the ultrasonic atomization plate 12 with the impedance of the driving branch 132, the reactive power of the combination of the first impedance branch and the ultrasonic atomization plate 12 can be reduced, so as to reduce the power loss, and the ultrasonic atomization plate 12 can obtain higher driving energy, thereby improving the efficiency of driving the ultrasonic atomization plate 12 and also improving the working efficiency of the ultrasonic atomizer 100.

On the other hand, in the use process of the ultrasonic atomizer 100, there is a problem that the difference in atomization performance of the ultrasonic atomizer is large due to the electrical characteristics of different ultrasonic atomizing sheets 12, and the main reasons are as follows: firstly, the ultrasonic atomization sheet 12 is made of piezoelectric material, and the electrical characteristics of the piezoelectric material are greatly different, which causes the electrical characteristics of different ultrasonic atomization sheets 12 to be different; next, after the ultrasonic atomization sheet 12 is assembled, differences in the electrical characteristics of the ultrasonic atomization sheet 12 may also occur due to differences in the assembly structural stress, pressure on the ultrasonic atomization sheet 12, contact resistance, and the like. Based on this, the embodiment of the present application sets N impedance branches, and sets different parameter values for the N impedance branches to satisfy matching requirements of different ultrasonic atomization sheets 12. Specifically, after the impedance branch (i.e., the first impedance branch) to be matched with the currently and actually used ultrasonic atomization sheet 12 is determined, the matching of the currently and actually used ultrasonic atomization sheet 12 to the appropriate impedance branch can be realized only by turning on the first switch branch (i.e., the target first switch branch) connected to the impedance branch, so that a better matching effect is achieved, power loss can be further reduced, and the efficiency of driving the ultrasonic atomization sheet 12 can be further improved.

In an embodiment, the impedance (Zh) of the combination of the first impedance branch and the ultrasonic atomization plate 12 includes a real impedance part (Rh) and an imaginary impedance part (j × Xh), and when the real impedance part is equal to the impedance (Z0) of the driving branch 132 and the imaginary impedance part is smaller than a first preset threshold, the impedance of the combination of the first impedance branch and the ultrasonic atomization plate 12 matches the impedance of the driving branch 132. Wherein Zh = Rh + j × Xh. And since the impedance of the driving branch 132 is pure resistance, Z0= R0, where R0 represents the resistance of the driving branch 132. Thus, if the impedance of the combination of the first impedance branch and the ultrasonic atomization plate 12 is matched with the impedance of the driving branch 132, the following conditions are satisfied: rh = R0, and j × Xh is less than a first preset threshold. Wherein, the closer j × Xh is to 0, the better the impedance matching effect of the combination of the first impedance matching branch and the ultrasonic atomization sheet 12 and the impedance of the driving branch 132 is, and the higher the working efficiency of the ultrasonic atomization sheet 12 is.

In one embodiment, as shown in fig. 4, the control circuit 13 further includes a current detection branch 133. The current detection branch 133 is connected to the power supply 14, the driving branch 132 and the controller 131.

Specifically, the current detecting branch 133 is used for detecting the output current of the power supply 14 to generate a first detection signal. The controller 131 is further configured to receive the first detection signal and determine the output current of the power supply 14 according to the first detection signal. The controller 131 is further configured to determine an impedance interval corresponding to the output current according to the corresponding relationship between the output current, the preset current and the impedance interval, where the impedance interval is an impedance interval in which the impedance of the ultrasonic atomization sheet 12 is located, so as to achieve the purpose of identifying the impedance of the ultrasonic atomization sheet 12. The controller 131 is further configured to determine a first impedance branch according to the impedance interval corresponding to the output current, so as to control a first switch branch connected to the first impedance branch to be turned on.

In the related art, the impedance of the ultrasonic atomization sheet 12 can be accurately identified by combining the DDS algorithm, the phase detection circuit, and the amplitude detection circuit, but this method has high cost, relatively complex circuit, and high implementation difficulty. Especially in the ultrasonic nebulizer field, ultrasonic nebulizer's selling price is lower, if adopt the mode among the correlation technique, probably leads to the net profit too low, is not suitable for carrying out the volume production, and the practicality is relatively poor.

For the present application, although the actual impedance of the ultrasonic atomization sheet 12 is not identified, and only the impedance interval where the ultrasonic atomization sheet is located is determined, the adopted circuit structure is simple, the implementation difficulty is low, the cost can be reduced to a greater extent, the mass production of the ultrasonic atomizer 100 is facilitated, and the practicability is strong.

Meanwhile, the requirements of subsequent functional design are met sufficiently. For example, in one embodiment, after identifying the impedance section where the impedance of the ultrasonic atomization sheet 12 is located, the corresponding impedance branch can be matched according to the impedance section, so as to reduce the capacitive or inductive part in the impedance of the first circuit composed of the ultrasonic atomization sheet 12 and the impedance branch, that is, reduce the phase difference between the current and the voltage of the first circuit. In an embodiment, after identifying the impedance interval where the impedance of the ultrasonic atomization sheet 12 is located and matching the corresponding impedance branch, the phase difference between the current and the voltage of the first circuit may be maintained at less than 30 °, so that the reactive power of the ultrasonic atomization sheet 12 may be reduced, which is beneficial to improving the working efficiency of the ultrasonic atomization sheet 12.

Secondly, after identifying the impedance interval where the impedance of the ultrasonic atomization sheet 12 is located, the corresponding heating control curve, that is, the corresponding power control interval, can be matched, so that the liquid matrix in the ultrasonic atomizer 100 can be better heated.

In addition, after the impedance interval where the impedance of the ultrasonic atomization sheet 12 is located is determined, AN impedance branch (i.e., a first impedance branch) with a higher matching degree with the impedance interval can be found in a plurality of preset impedance branches (including the impedance branch A1 and the impedance branch A2 \8230; and the impedance branch AN), at this time, a smaller phase difference exists between the current and the voltage of a first circuit formed by the ultrasonic atomization sheet 12 and the first impedance branch, and then the first impedance branch is connected into the circuit for use, so that a better matching effect is achieved, and the efficiency of the ultrasonic atomization sheet 12 is higher.

In one embodiment, as shown in fig. 5, the driving branch 132 includes a power sub-branch 1321, a switch sub-branch 1322 and a resonator sub-branch 1323. The power sub-branch 1321 is connected to the power supply 14 through the current detection branch 133, the switch sub-branch 1322 is connected to the controller 131 and the power sub-branch 1321, and the resonator sub-branch 1323 is connected to the power sub-branch 1321 and the switch sub-branch 1322.

Specifically, the power sub-branch 1321 is used to generate a dc power from the power supply 14. The switch sub-branch 1322 is configured to be turned on and off in response to a first pulse signal output by the controller 131 to generate a pulse voltage according to the dc power. The resonance sub-branch 1323 is configured to resonate in response to the switching on and off of the switch sub-branch 1322 to output the driving voltage according to the pulse voltage.

In this embodiment, when the ultrasonic atomizing plate 12 needs to be driven, first, the power supply 14 is converted into a dc power supply to be output after passing through the power supply sub-branch 1321, and at the same time, the controller 131 outputs the first pulse signal to control the switch sub-branch 1322 to be continuously and cyclically switched between on and off, so as to convert the dc power supply output by the power supply sub-branch 1321 into an ac power supply, i.e. a pulse voltage. Then, after the resonance occurs, the resonator branch 1323 can boost the received pulse voltage and drive the ultrasonic atomization sheet 12 with the boosted drive voltage. Since the harmonic oscillator branch 1323 implements resonance, the harmonic oscillator branch 1323 substantially presents pure resistance, and a portion of reactive power of the harmonic oscillator branch 1323 can be reduced, that is, power loss is reduced, thereby improving the working efficiency of the ultrasonic atomizer 100. In this case, the impedance of the harmonic oscillator branch 1323 is the smallest, the current is the largest, and a larger driving voltage can be output to drive the ultrasonic atomization sheet 12 to operate stably.

Referring to fig. 6, fig. 6 illustrates an example of a structure of the current detecting branch 133. As shown in fig. 6, the current detecting branch 133 includes an amplifier U1 and a first resistor R1. The first resistor R1 is connected to the amplifier U1, the power supply 14 and the power supply sub-branch 1321, and the amplifier U1 is connected to the controller 131.

Specifically, a first end of the first resistor R1 is connected to the power supply 14 and a non-inverting input terminal of the amplifier U1, a second end of the first resistor R1 is connected to an inverting input terminal of the amplifier U1 and the power supply sub-branch 1321, an output terminal of the amplifier U1 is connected to the controller 131, a ground terminal of the amplifier U1 is grounded GND, and a power supply terminal of the amplifier U1 is connected to the voltage V1.

In this embodiment, the amplifier U1 is configured to output a first detection signal according to the voltage across the first resistor R1, such that the controller 132 determines the output current of the power supply 14 according to the first detection signal. Specifically, the amplifier U1 can amplify the voltage received across the first resistor R1 by K times and output a first detection signal, where K is a positive integer. Then, the controller 131 may determine the current output by the power supply 14 according to the relationship between the first detection signal and the current output by the power supply 14 after acquiring the first detection signal.

In an embodiment, the current detecting branch 131 further includes a fourth capacitor C4, a fifth capacitor C5, a second resistor R2, and a third resistor R3. The fourth capacitor C4 and the fifth capacitor C5 are filter capacitors, the second resistor R2 is a current limiting resistor, and the third resistor R3 is a pull-down resistor.

In one embodiment, as shown in fig. 7, the power sub-branch 1321 includes a first inductor L1. A first end of the first inductor L1 is connected to the power supply 14 through the current detection branch 133, and a second end of the first inductor L1 is connected to the switch branch 1322 and the resonator branch 1323, respectively.

Specifically, the first inductor L1 is a high-frequency choke coil, which has a large blocking effect only on high-frequency alternating current, has a small blocking effect on low-frequency alternating current, and has a smaller blocking effect on direct current, and thus can be used for "passing direct current, blocking alternating current, passing low frequency, and blocking high frequency". Thus, the first inductor L1 may allow direct current to pass through to provide energy for a subsequent circuit, i.e., to implement a process of outputting direct current power according to the power supply 14. In addition, the first inductor L1 may also be used to prevent high frequency short circuits.

Fig. 7 also illustrates one configuration of the switch sub-branch 1322, as shown in fig. 7, the switch sub-branch 1322 includes a switch tube Q1. The first end of the switching tube Q1 is connected to the controller 131, the second end of the switching tube Q1 is grounded GND, and the third end of the switching tube Q1 is connected to the power supply branch 1321 and the resonator branch 1323, respectively.

In this embodiment, the switching transistor Q1 is an NMOS transistor as an example. Specifically, the gate of the NMOS transistor is the first end of the switching transistor Q1, the source of the NMOS transistor is the second end of the switching transistor Q1, and the drain of the NMOS transistor is the third end of the switching transistor Q1.

Besides, in other embodiments, the switching tube Q1 may also be a P-type metal oxide semiconductor field effect transistor or a signal relay, and the switching tube Q1 may also be at least one of a triode, 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, and a thyristor.

In one embodiment, switch sub-branch 1322 further includes a fourth resistor R4 and a fifth resistor R5 connected in series. The first end of the circuit formed by connecting the fourth resistor R4 and the fifth resistor R5 in series is connected to the controller 131, the second end of the circuit formed by connecting the fourth resistor R4 and the fifth resistor R5 in series is grounded GND, and the connection point between the fourth resistor R4 and the fifth resistor R5 is connected to the first end of the switching tube Q1.

In this embodiment, the fourth resistor R4 and the fifth resistor R5 are used for dividing the voltage of the first pulse signal output by the controller 131 to obtain the voltage of the first end of the switching tube Q1. When the divided voltage of the fifth resistor R5 is greater than the on-state voltage of the switching tube Q1, the switching tube Q1 is turned on, otherwise, the switching tube Q1 is turned off.

In an embodiment, the switch sub-branch 1322 further includes a first capacitor C1, a first end of the first capacitor C1 is connected to the third end of the switch Q1, and a second end of the first capacitor C1 is grounded GND.

Specifically, the first capacitor C1 is used for charging when the switching tube Q1 is turned off and the current flowing through the resonator branch 1323 is smaller than the first current threshold, and is used for discharging by resonating with the resonator branch 1323 when the switching tube Q1 is turned off and the current flowing through the resonator branch 1323 is greater than or equal to the first current threshold. When the first capacitor C1 discharges to the second current threshold, the switching tube Q1 is turned on.

It is understood that the settings of the first current threshold and the second current threshold are related to the parameters of the first capacitor C1 and the resonator branch 1323. In other words, in different application scenarios, different first current thresholds and second current thresholds can be obtained by selecting different first capacitors C1 and resonator branches 1323, which is not limited in this embodiment of the present application.

In this embodiment, the provision of the first capacitor C1 may act as a voltage hysteresis. Specifically, when the switching tube Q1 is turned off, the voltage between the second terminal and the third terminal of the switching tube Q1 does not suddenly rise, but the voltage across the first capacitor C1 is maintained. Until the current between the second terminal and the third terminal of the switching tube Q1 is reduced to zero, the voltage between the second terminal and the third terminal of the switching tube Q1 starts to increase again. Thereby, soft turn-off of the switching tube Q1 is realized.

Meanwhile, the current flowing through the harmonic oscillator branch 1323 is smaller than the first current threshold, and the first capacitor C1 is charged. Then, the current of the resonator branch 1323 gradually increases until the current is greater than or equal to the first current threshold, the current of the resonator branch 1323 is greater than the current of the first inductor L1, and the first capacitor C1 resonates with the resonator branch 1323 to discharge. Then, when the first capacitor C1 discharges to the second current threshold, the switch Q1 is turned on. As can be seen, by selecting the appropriate first capacitor C1 and the harmonic oscillator branch 1323 to make the second current threshold be zero, zero-voltage conduction of the switching tube Q1 can be achieved, that is, soft turn-on of the switching tube Q1 is achieved.

It can be appreciated that when a transistor (e.g., the switching transistor Q1) is in a switching state, 100% efficiency can be achieved theoretically. However, due to the influence of the barrier capacitance, diffusion capacitance and distributed capacitance in the circuit, the transistor needs a certain switching time from saturation to cutoff or from cutoff to saturation. Therefore, the collector current and the collector voltage of the tube in the switching time have larger values, so that the tube consumption is increased. In general, when the parasitic capacitance is not too large and the operating frequency is low, the influence thereof can be ignored. However, at higher operating frequencies, the increase in tube loss is not negligible, resulting in reduced efficiency and even damage to the device.

Therefore, in this embodiment, by providing the first capacitor C1 and the resonator branch 1333, a soft switching process (including soft on and soft off) of the switching tube Q1 can be implemented, that is, the product of the voltage and the current is always zero when the switching tube Q1 is turned on and off. Therefore, the switching loss of the switching tube Q1 is also close to zero, the switching efficiency of the switching tube Q1 is high, and the working efficiency of the ultrasonic atomizer 100 is further improved.

Fig. 7 also illustrates a structure of the resonant sub-branch 1323, and as shown in fig. 7, the resonant sub-branch 1323 includes a second capacitor C2 and a second inductor L2. A first end of the second capacitor C2 is connected to the power sub-branch 1321 (i.e., the second end of the first inductor L1) and the switch sub-branch 1322 (i.e., the third end of the switching tube Q1), a second end of the second capacitor C2 is connected to a first end of the second inductor L2, a second end of the second inductor L2 is connected to the first switch branch K11, the first switch branch K12 \823030, and the first switch branch K1N.

In this embodiment, when the second capacitor C2 and the second inductor L2 form a series resonance, a circuit formed by the second capacitor C2 and the second inductor L2 is a pure resistance, and at this time, the impedance is the minimum, the current is the maximum, and a high voltage N times greater than the pulse voltage input to the resonator branch 1323 is generated on the second capacitor C2 and the second inductor L2, where N is greater than 1. The high voltage is used as a driving voltage for driving the ultrasonic atomization sheet 12. Then, the ultrasonic atomization sheet 12 can obtain sufficient driving energy, which is beneficial to maintaining the stable operation of the ultrasonic atomization sheet 12.

In one embodiment, as shown in fig. 7, each first switching branch comprises a switch, and each switch is connected between the driving branch 132 and one impedance branch. That is, the first switch branch K11 includes a first switch S11, the first switch branch K12 includes a first switch S12 \8230, and the first switch branch K1N includes a first switch S1N. The first switch S11 is connected between the driving branch 132 and the impedance branch A1, the first switch S12 is connected between the driving branch 132 and the impedance branch A2 \8230, and the first switch S1N is connected between the driving branch 132 and the impedance branch AN.

In this embodiment, the impedance branch is switched into the circuit when the switch to which it is connected is closed. For example, if the impedance branch A1 is the first impedance branch matched with the current ultrasonic atomization sheet 12, the first switches S11 are all closed to connect the impedance branch A1 into the circuit, so that the impedances of the impedance branch A1 and the ultrasonic atomization sheet 12 are matched with the impedance of the driving branch 132.

In an embodiment, referring to fig. 7, each of the impedance branches includes a third inductor. Wherein, each third inductor is connected between one first switch branch and the ultrasonic atomization sheet 12. Specifically, impedance branch A1 includes a third inductor L11, impedance branch A2 includes a third inductor L12 \8230, and impedance branch AN includes a third inductor L1N. The third inductor L11 is connected between the first switch branch K11 and the ultrasonic atomization sheet 12, the third inductor L12 is connected between the first switch branch K12 and the ultrasonic atomization sheet 12 \8230, and the third inductor L1N is connected between the first switch branch K1N and the ultrasonic atomization sheet 12.

It should be noted that fig. 7 only illustrates one structure of the impedance branch, and in other embodiments, the impedance branch may also be implemented by using other structures, which is not specifically limited in this application embodiment, and it is only necessary to match the impedance of the combination of the impedance branch and the ultrasonic atomization plate 12 with the impedance of the combination of the driving branch 133. It should be noted, however, that in the embodiments shown in fig. 3, 4, 5 and 7, the impedance branches should not be connected to ground GND.

Further, when the impedance branch has one end connected to the ground GND, the control circuit 13 further includes N second switch branches. Wherein a second switching branch is connected between an impedance branch and the ultrasonic atomization sheet 12.

Taking the example of adding N second switch branches to the structure shown in fig. 3, as shown in fig. 8, the N second switch branches include a second switch branch K21, a second switch branch K22 \8230, and a second switch branch K2N. The second switch branch K21 is connected between the impedance branch A1 and the ultrasonic atomization sheet 12, the second switch branch K22 is connected between the impedance branch A2 and the ultrasonic atomization sheet 12 \8230, and the second switch branch K2N is connected between the impedance branch AN and the ultrasonic atomization sheet 12. The second switch branch K21, the second switch branch K22 \8230andthe second switch branch K2N are connected with the controller 131.

The controller 131 is further configured to: the second switching branch connected with the first impedance branch is controlled to be conducted, so that the impedance of the combination of the first impedance branch and the ultrasonic atomization sheet 12 is matched with the impedance of the driving branch 132.

In this embodiment, when the impedance branch has one end grounded GND, the first switch branch and the second switch branch connected to the first impedance branch need to be turned on at the same time, so that the first impedance branch can be connected to the circuit for use, that is, the impedance of the combination of the first impedance branch and the ultrasonic atomization plate 12 can be matched with the impedance of the driving branch 132. Wherein, through setting up a N second switch branch road, can prevent the mutual interference between each impedance branch road, be favorable to improving the stability of ultrasonic nebulizer work.

In one embodiment, each of the first switching branch and the second switching branch includes: at least one of a relay, a triode or a metal oxide semiconductor field effect transistor.

Referring to fig. 9, a structure of the second switching branch is exemplarily shown in fig. 9. As shown in fig. 9, each second switch branch comprises a switch, and each switch is connected between the ultrasonic atomization plate 12 and one impedance branch. That is, the second switch branch K21 includes the second switch S11, the second switch branch K22 includes the second switch S22 \8230, and the second switch branch K2N includes the second switch S2N. The second switch S21 is connected between the ultrasonic atomization sheet 12 and the impedance branch A1, the second switch S22 is connected between the ultrasonic atomization sheet 12 and the impedance branch A2, \8230, and the second switch S2N is connected between the ultrasonic atomization sheet 12 and the impedance branch AN.

In an embodiment, referring to fig. 9, each of the impedance branches includes a third capacitor, a fourth inductor, and a fifth inductor. The first end of the fourth inductor is connected with the first switch branch circuit, the second end of the fourth inductor is connected with the first end of the third capacitor and the first end of the fifth inductor respectively, the second end of the third capacitor is grounded, and the second end of the fifth inductor is connected with the second switch branch circuit.

Taking the impedance branch A1 as an example, the impedance branch A1 includes a third capacitor C11, a fourth inductor L21, and a fifth inductor L31. A first end of the fourth inductor L21 is connected to the first switch branch K11, a second end of the fourth inductor L21 is connected to a first end of the third capacitor C11 and a first end of the fifth inductor L31, a second end of the third capacitor C11 is grounded GND, and a second end of the fifth inductor L31 is connected to the second switch branch K21.

It should be noted that fig. 9 only illustrates one structure of the impedance branch, and in other embodiments, the impedance branch may also have other structures, which is not specifically limited in this application, and only the impedance of the combination of the impedance branch and the ultrasonic atomization plate 12 is matched with the impedance of the combination of the driving branch 132. For example, in one embodiment, each impedance branch further includes only the third capacitor and the fifth inductor as shown in fig. 10, for example, the impedance branch A2 includes only the third capacitor C12 and the fifth inductor L32. For another example, in another embodiment, each impedance branch further includes a third capacitor, a fourth capacitor, and a fifth inductor as shown in fig. 11, for example, the impedance branch A1 further includes a third capacitor C11, a fourth capacitor C21, and a fifth inductor L21.

Referring to fig. 12, fig. 12 is a flowchart illustrating an impedance matching method for an ultrasonic atomizer according to an embodiment of the present disclosure. In some embodiments, the specific structure of the ultrasonic atomizer can be implemented by the structures shown in fig. 1 to 11, and the specific implementation process is described in detail in the above embodiments and is not described herein again.

As shown in fig. 12, the impedance identification method includes the steps of:

step 1201: a first impedance branch is determined that matches an impedance of an ultrasonic atomization patch in an ultrasonic atomizer.

Step 1202: and connecting the first impedance branch between the ultrasonic atomization sheet and the drive circuit so as to match the combined impedance of the first impedance branch and the ultrasonic atomization sheet with the impedance of the drive circuit.

Wherein, the drive circuit is a circuit for driving the ultrasonic atomization sheet.

Taking the circuit structure shown in fig. 8 as AN example, if the first impedance branch is AN impedance branch AN, the impedance branch can be connected between the driving branch 132 and the ultrasonic atomizing sheet 12 by turning on the first switch branch K1N and the second switch branch K2N, so that the combined impedance of the impedance branch AN and the ultrasonic atomizing sheet 12 can be matched with the impedance of the driving circuit 132, the reactive power portion of the combination of the impedance branch AN and the ultrasonic atomizing sheet 12 can be reduced, so as to reduce the power loss, the ultrasonic atomizing sheet 12 can obtain higher driving energy, the efficiency of driving the ultrasonic atomizing sheet 12 is improved, and the working efficiency of the ultrasonic atomizer 100 is also improved.

In one embodiment, as shown in fig. 13, the process of determining a first impedance branch that matches the impedance of an ultrasonic atomization patch in an ultrasonic nebulizer in step 1201 may include the steps of:

step 1301: and acquiring a first current, wherein the first current is the current output by a power supply in the ultrasonic atomizer when the ultrasonic atomization sheet works at the resonant frequency.

Specifically, when the ultrasonic atomization sheet works at the resonant frequency, by obtaining the current output by the power supply (i.e., the first current), the current impedance range of the ultrasonic atomization sheet can be correspondingly determined by the current. In one embodiment, the first current may be obtained by the current detecting branch 131 shown in fig. 7.

In an embodiment, before performing step 1301, the impedance identification method further includes: and controlling the power supply to output an initial voltage to start the ultrasonic atomization sheet to work, wherein the initial voltage is any value of [5V,6V ].

Specifically, when different ultrasonic atomization sheets are connected to the ultrasonic atomizer and tested, the initial voltages of the ultrasonic atomization sheets when the ultrasonic atomization sheets are started are kept consistent, so that the currents are collected under the same initial voltage, and the impedance range of the ultrasonic atomization sheets can be correspondingly determined by the currents. Meanwhile, by setting the initial voltage to any value of [5v,6v ], it can be ensured that the current of the ultrasonic atomization sheet is not excessively large when the ultrasonic atomization sheet operates at the resonance frequency, so as to prevent the temperature of the ultrasonic atomization sheet from being excessively high.

In an embodiment, the process of obtaining the first current in step 1301 may include the following steps: firstly, a plurality of driving frequencies are output, and the output current of the power supply at each driving frequency is collected at least part of the driving frequencies in the plurality of driving frequencies. Next, a maximum current in the output currents is determined, and a first current is determined based on the maximum current.

When the ultrasonic atomization sheet works at the resonant frequency, the output current of the power supply is the maximum current, and the output current of the power supply is generally a sine wave, so that if the detected output current of the power supply shows a decreasing trend along with the increase of the driving frequency, the current does not need to be collected again at the subsequent driving frequency, and the working efficiency is improved. That is, the output current of the power supply may only need to be collected at a portion of the plurality of driving frequencies, or may need to be collected at all of the plurality of driving frequencies.

Specifically, in one embodiment, the process of collecting the output current of the power supply at each of the plurality of driving frequencies at least a portion of the plurality of driving frequencies comprises the steps of: and acquiring K output current values of the power supply at each driving frequency under at least part of the driving frequencies, wherein K is an integer more than or equal to 1. And performing average value operation or root mean square value operation according to the K output current values to determine the output current.

For example, if 5 driving frequencies are output and when the 4 th driving frequency is output, it is detected that the output current of the power supply is decreased, only the output current of the power supply at the first 3 driving frequencies needs to be collected. Firstly, at the 1 st driving frequency, 5 (taking K =5 as an example) output current values are collected, the 5 output current values are summed and then averaged (i.e., averaged) to obtain the output current, or the 5 output currents are squared and then averaged, and then squared (i.e., squared root mean square operation) to obtain the output current, so that the output current at the 1 st driving frequency is determined. Then, by analogy, the output current at the 2 nd driving frequency and the output current at the 3 rd driving frequency are sequentially determined.

It is understood that, in this embodiment, an average value operation or a root mean square value operation is performed after K output current values are obtained, and the output current is determined as an example. In other embodiments, the output current may be determined in other manners, for example, taking the median of the K output currents as the output current.

Further, after determining the output current at each of at least some of the drive frequencies, the determined output currents may be compared in magnitude to determine a maximum current of the output currents.

Continuing with the above example as an example, after determining the total three output currents of the output current at the 1 st driving frequency, the output current at the 2 nd driving frequency and the output current at the 3 rd driving frequency, the maximum current of the three currents is obtained, which is the first current.

Step 1302: and determining an impedance interval corresponding to the first current according to the corresponding relation among the first current, the preset current and the impedance interval.

Step 1303: and according to the impedance interval, determining an impedance branch matched with the impedance interval so as to determine a first impedance branch matched with the impedance of an ultrasonic atomization sheet in the ultrasonic atomizer.

In an embodiment, the preset correspondence between the current and the impedance interval includes a preset correspondence between the current interval and the impedance interval, and the step 1302 of determining the impedance interval corresponding to the first current according to the preset correspondence between the current and the impedance interval includes the following steps: a current interval in which the first current is located is determined. And determining the impedance interval corresponding to the first current interval according to the preset corresponding relation between the current interval and the impedance interval.

Specifically, the current interval where the first current is located is found according to the first current, and the impedance interval corresponding to the current interval where the first current is located can be determined according to the preset corresponding relationship between the current interval and the impedance interval, so that the impedance interval corresponding to the first current is determined. The impedance interval is the impedance interval where the impedance of the ultrasonic atomization sheet is located, so that the aim of identifying the impedance of the ultrasonic atomization sheet is fulfilled.

In one embodiment, the predetermined current interval includes a plurality of current intervals, and the predetermined impedance interval includes a plurality of impedance intervals. At least one preset impedance interval is within [ 5-50 Ω ], and at least one preset current interval is within [ 0.5-2.2A ].

For example, in one embodiment, the predetermined impedance intervals are [5,10], [11,15], [16,20], [21,25], [26,30], [31,35], [36,40], [41,45], [46,50], the predetermined current intervals are [2.1,2.2], [2,2.1], [1.7,1.9], [1.5,1.6], [1.3,1.4], [1.1,1.2], [0.9,1.0], [0.7,0.8], [0.5,0.6], and one impedance interval corresponds to one current interval, e.g., the impedance interval [5,10] corresponds to the current interval [2.1,2.2]. Therefore, after the first current is determined, the impedance section corresponding to the first current can be determined according to the correspondence relationship between the impedance section and the current section. In addition, in this embodiment, it is taken as an example that the preset impedance interval is within [5 Ω -50 Ω ], and the preset current interval is within [0.5A-2.2A ], but in other embodiments, other setting manners may be adopted, which is not limited in this embodiment.

The impedance interval corresponding to the first current is the impedance interval where the impedance of the ultrasonic atomization sheet 12 is located. After the impedance interval where the impedance of the ultrasonic atomization sheet 12 is located is determined, a corresponding impedance branch can be matched for the current ultrasonic atomization sheet 12, and the impedance branch is a first impedance branch.

It should be understood that, for specific control of the ultrasonic atomizer in the method embodiment and the beneficial effects thereof, reference may be made to the corresponding description in the above-mentioned embodiment of the ultrasonic atomizer, and for brevity, detailed description is omitted here.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit the same; within the context of the present application, where technical features in the above embodiments or in different embodiments can also be combined, the steps can be implemented in any order and there are many other variations of the different aspects of the present application as described above, which are not provided in detail for the sake of brevity; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.

Claims

1. An ultrasonic atomizer, comprising:

the liquid storage cavity is used for storing liquid matrix;

an ultrasonic atomization plate for generating oscillations to atomize the liquid matrix;

a control circuit and a power supply;

wherein the control circuit comprises:

the controller and the driving branch circuit are respectively connected with the power supply and the controller, the driving branch circuit is used for responding to a first pulse signal and generating a driving voltage, and the driving voltage is used for driving the ultrasonic atomization sheet;

2. The ultrasonic atomizer according to claim 1, wherein one end of said impedance branch is grounded, said control circuit further comprises N second switch branches, one of said second switch branches is connected between one of said impedance branches and said ultrasonic atomization plate, and said second switch branch is further connected to said controller;

the controller is also used for controlling the conduction of a second switch branch circuit connected with the first impedance branch circuit so as to enable the impedance of the combination of the first impedance branch circuit and the ultrasonic atomization sheet to be matched with the impedance of the driving branch circuit.

3. The ultrasonic nebulizer of claim 2, wherein the first switching leg and the second switching leg each comprise: at least one of a relay, a triode or a metal oxide semiconductor field effect transistor.

4. The ultrasonic nebulizer of claim 1, wherein the combined impedance of the first impedance branch and the ultrasonic atomization sheet comprises a real impedance part and an imaginary impedance part, and the combined impedance of the first impedance branch and the ultrasonic atomization sheet matches the impedance of the driving branch when the real impedance part is equal to the impedance of the driving branch and the imaginary impedance part is less than a first preset threshold.

5. The ultrasonic nebulizer of claim 1, wherein the control circuit further comprises a current sense branch;

6. The ultrasonic atomizer according to claim 5, wherein said current detecting branch comprises an amplifier and a first resistor, said first resistor is respectively connected with said amplifier, said power supply and said ultrasonic atomizing plate, and said amplifier is connected with said controller;

the amplifier is used for outputting the first detection signal to the controller according to the voltage at two ends of the first resistor, so that the controller determines the output current of the power supply according to the first detection signal.

7. The ultrasonic nebulizer of claim 1, wherein the driving branch comprises:

8. The ultrasonic nebulizer of claim 7, wherein the power supply sub-branch comprises a first inductance;

the first end of the first inductor is connected with the power supply, and the second end of the first inductor is connected with the switch sub-branch and the resonance sub-branch respectively.

9. The ultrasonic nebulizer of claim 7, wherein the switching sub-branch comprises a switching tube;

10. The ultrasonic nebulizer of claim 9, wherein the switch sub-branch further comprises a first capacitor, a first end of the first capacitor is connected to the third end of the switch tube, and a second end of the first capacitor is grounded;

11. The ultrasonic atomizer of claim 7, wherein said harmonic oscillator branch comprises a second capacitor and a second inductor;

12. The ultrasonic nebulizer of claim 1, wherein the first switching leg comprises a first switch;

13. The ultrasonic nebulizer of claim 1, wherein the impedance branch comprises a third inductance;

14. The ultrasonic nebulizer of claim 2, wherein the impedance branch comprises a fourth inductor, a third capacitor, and a fifth inductor;

15. The ultrasonic nebulizer of claim 2, wherein the second switching leg comprises a second switch;