A multi-stage amplitude-adjustable ultrasonic atomizer driving circuit

Abstract

The utility model relates to power semiconductor drive circuit technical field especially, it relates to a multistage amplitude adjustable ultrasonic wave atomizer drive circuit, include: oscillation signal generation unit, buffer isolation unit, amplitude adjustment unit and power amplifier unit, oscillation signal generation unit includes first triode (Q1), first inductance (L1), first electric capacity (C1), second electric capacity (C2), buffer isolation unit includes second triode (Q2) and fourth resistance (R4), amplitude adjustment unit includes linear potentiometer (RV1A), power amplifier unit includes third triode (Q3), second inductance (L2), fourth electric capacity (C4), through the technical scheme of the utility model, effectively solved how to not rely on digital control chip, automatic frequency tracking circuit and output impedance matching network under the condition, realize the continuous linear amplitude adjustment of meeting the precision requirement, ensure the oscillation stability and anti -interference simultaneously under the whole temperature range working condition.

Description

Technical Field

[0001] This utility model relates to the field of power semiconductor drive circuit technology, and in particular to a multi-level amplitude adjustable ultrasonic atomizer drive circuit. Background Technology

[0002] In the field of ultrasonic atomizer drive technology, conventional solutions generally use digital control chips as the core to build the adjustment system. This type of architecture requires a microprocessor to generate pulse modulation signals or digital-to-analog conversion signals to control the output amplitude, while relying on an automatic frequency tracking module to monitor and lock the transducer's resonant frequency in real time. To achieve efficient energy transfer, the power amplifier stage output also needs to be configured with a complex impedance matching network to coordinate electroacoustic conversion efficiency.

[0003] However, this technical approach has fundamental limitations. The inherent discrete nature of digital control leads to stepped jumps in amplitude regulation, making truly smooth, continuous linear control impossible. A more pronounced contradiction is that the automatic frequency tracking circuit is highly susceptible to detuning due to transducer parameter drift when ambient temperature and humidity change, forcing the system to incorporate temperature compensation units and complex algorithms. This not only increases circuit complexity but also introduces high-frequency switching noise that interferes with system stability. The performance degradation of magnetic components in the matching network under humid conditions further exacerbates fluctuations in energy transfer efficiency. Crucially, the entire digital control system is vulnerable to extreme temperature environments; abnormal clock signals and sampling distortion at low temperatures can cause amplitude runaway, while digital signal edge degradation in high humidity environments frequently triggers malfunctions. These shortcomings create a mutually reinforcing technical dilemma: pursuing precise regulation inevitably relies on complex digital circuits, but increased circuit complexity weakens environmental adaptability; enhancing frequency tracking capability comes at the cost of system stability, while improving impedance matching efficiency is limited by the environmental sensitivity of components. Ultimately, the existing technology system still suffers from irreconcilable systemic defects in three core dimensions: continuous linear adjustment accuracy, full-temperature-range oscillation stability, and resistance to environmental interference. Utility Model Content

[0004] In view of at least one of the above technical problems, this utility model provides a multi-level amplitude adjustable ultrasonic atomizer driving circuit, which adopts a pure analog architecture base current direct drive topology and a solid frequency high Q oscillation power amplifier integrated design, and solves the problem of continuous linear amplitude adjustment and full-condition stability of ultrasonic atomizer under conditions without digital chip, frequency tracking and matching network.

[0005] According to a first aspect of the present invention, a multi-level amplitude adjustable ultrasonic atomizer driving circuit is provided, comprising: Oscillation signal generation unit, buffer isolation unit, amplitude adjustment unit, and power amplification unit; The oscillation signal generation unit includes a first transistor (Q1), a first inductor (L1), a first capacitor (C1), a second capacitor (C2), a third capacitor (C3), a first resistor (R1), and a third resistor (R3). The base of the first transistor (Q1) is connected to the positive terminal of the power supply (VCC) through the first resistor (R1) and grounded through the second capacitor (C2). The collector of the first transistor (Q1) is connected to the first terminal of the first inductor (L1), and the second terminal of the first inductor (L1) is connected to the positive terminal of the power supply (VCC). The collector of the first transistor (Q1) is also connected to the base of the first transistor (Q1) through the first capacitor (C1). The emitter of the first transistor (Q1) is grounded through the third resistor (R3). The collector of the first transistor (Q1) is connected to the positive terminal of the third capacitor (C3). The buffer isolation unit includes a second transistor (Q2), a second resistor (R2), and a fourth resistor (R4); the base of the second transistor (Q2) is connected to the negative terminal of the third capacitor (C3) and grounded through the second resistor (R2); the emitter of the second transistor (Q2) is grounded through the fourth resistor (R4); and the collector of the second transistor (Q2) is directly connected to the positive terminal of the power supply (VCC). The amplitude adjustment unit includes a linear potentiometer (RV1A); the first fixed terminal of the linear potentiometer (RV1A) is connected to the emitter of the second transistor (Q2); the second fixed terminal of the linear potentiometer (RV1A) is grounded; and the sliding terminal of the linear potentiometer (RV1A) outputs an amplitude adjustment signal. The power amplification unit includes a third transistor (Q3), a second inductor (L2), a fourth capacitor (C4), a fifth capacitor (C5), a fifth resistor (R5), and a sixth resistor (R6). The base of the third transistor (Q3) is connected to the sliding terminal of the linear potentiometer (RV1A) and grounded through the fifth resistor (R5). The emitter of the third transistor (Q3) is grounded through the sixth resistor (R6). The collector of the third transistor (Q3) is connected to the first terminal of the second inductor (L2), and the second terminal of the second inductor (L2) is connected to the positive terminal of the power supply (VCC). The collector of the third transistor (Q3) is also grounded through the fourth capacitor (C4). The collector of the third transistor (Q3) is connected to the positive terminal of the fifth capacitor (C5), and the negative terminal of the fifth capacitor (C5) serves as the output terminal to drive the ultrasonic transducer.

[0006] Furthermore, the capacitance values ​​of the first capacitor (C1) and the second capacitor (C2) of the oscillation signal generation unit are 100pF and 10nF, respectively; the inductance value of the first inductor (L1) is 1mH; the resistance value of the first resistor (R1) is 10kΩ; and the resistance value of the third resistor (R3) is 100Ω.

[0007] Furthermore, the second resistor (R2) of the buffer isolation unit has a resistance of 10kΩ, and the fourth resistor (R4) has a resistance of 1kΩ; the second transistor (Q2) is configured as an emitter follower with an input impedance greater than 100kΩ.

[0008] Furthermore, the linear potentiometer (RV1A) of the amplitude adjustment unit has a resistance of 10kΩ; there is no series resistance between the sliding end of the linear potentiometer and the base of the third transistor (Q3).

[0009] Furthermore, the fourth capacitor (C4) of the power amplifier unit has a capacitance of 100pF, the fifth capacitor (C5) has a capacitance of 10nF, and the second inductor (L2) has an inductance of 100μH.

[0010] Furthermore, the fifth resistor (R5) of the power amplifier unit has a resistance of 10kΩ, and the sixth resistor (R6) has a resistance of 470Ω; there is no series resistance between the collector of the third transistor (Q3) and the second inductor (L2).

[0011] Furthermore, both the third capacitor (C3) and the fifth capacitor (C5) are electrolytic capacitors; the third capacitor (C3) has a capacitance of 1μF, and the fifth capacitor (C5) has a capacitance of 10nF.

[0012] Furthermore, the first transistor (Q1), the second transistor (Q2), and the third transistor (Q3) are all model 2N2222; the positive terminal of the power supply (VCC) is a 12V DC power supply.

[0013] Furthermore, the frequency of the circuit output signal is determined by the first inductor (L1), the first capacitor (C1), and the second capacitor (C2); there is no additional matching circuit between the output terminal and the ultrasonic transducer.

[0014] Furthermore, the amplitude adjustment unit implements signal voltage division using a single linear potentiometer (RV1A).

[0015] The beneficial effects of this utility model are: it effectively solves the problem of how to achieve continuous linear amplitude adjustment that meets accuracy requirements without relying on digital control chips, automatic frequency tracking circuits and output impedance matching networks, while ensuring oscillation stability and anti-interference under full temperature range conditions. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the circuit structure of a multi-level amplitude adjustable ultrasonic atomizer drive circuit. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0019] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0020] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0021] like Figure 1 The multi-stage amplitude-adjustable ultrasonic atomizer drive circuit shown includes: Oscillation signal generation unit, buffer isolation unit, amplitude adjustment unit, and power amplification unit; The oscillation signal generation unit includes a first transistor (Q1), a first inductor (L1), a first capacitor (C1), a second capacitor (C2), a third capacitor (C3), a first resistor (R1), and a third resistor (R3). The base of the first transistor (Q1) is connected to the positive terminal of the power supply (VCC) through the first resistor (R1) and grounded through the second capacitor (C2). The collector of the first transistor (Q1) is connected to the first terminal of the first inductor (L1), and the second terminal of the first inductor (L1) is connected to the positive terminal of the power supply (VCC). The collector of the first transistor (Q1) is also connected to the base of the first transistor (Q1) through the first capacitor (C1). The emitter of the first transistor (Q1) is grounded through the third resistor (R3). The collector of the first transistor (Q1) is connected to the positive terminal of the third capacitor (C3). The buffer isolation unit includes a second transistor (Q2), a second resistor (R2), and a fourth resistor (R4); the base of the second transistor (Q2) is connected to the negative terminal of the third capacitor (C3) and grounded through the second resistor (R2); the emitter of the second transistor (Q2) is grounded through the fourth resistor (R4); and the collector of the second transistor (Q2) is directly connected to the positive terminal of the power supply (VCC). The amplitude adjustment unit includes a linear potentiometer (RV1A); the first fixed terminal of the linear potentiometer (RV1A) is connected to the emitter of the second transistor (Q2); the second fixed terminal of the linear potentiometer (RV1A) is grounded; and the sliding terminal of the linear potentiometer (RV1A) outputs an amplitude adjustment signal. The power amplifier unit includes a third transistor (Q3), a second inductor (L2), a fourth capacitor (C4), a fifth capacitor (C5), a fifth resistor (R5), and a sixth resistor (R6). The base of the third transistor (Q3) is connected to the sliding terminal of the linear potentiometer (RV1A) and grounded through the fifth resistor (R5). The emitter of the third transistor (Q3) is grounded through the sixth resistor (R6). The collector of the third transistor (Q3) is connected to the first terminal of the second inductor (L2), and the second terminal of the second inductor (L2) is connected to the positive terminal of the power supply (VCC). The collector of the third transistor (Q3) is also grounded through the fourth capacitor (C4). The collector of the third transistor (Q3) is connected to the positive terminal of the fifth capacitor (C5), and the negative terminal of the fifth capacitor (C5) serves as the output terminal to drive the ultrasonic transducer.

[0022] In some embodiments of this utility model, specifically, the core of the oscillation signal generation unit lies in achieving a stable oscillation signal output through circuit parameter design. The base of the first transistor is connected to the positive terminal of the power supply via a first resistor, and grounded via a second capacitor, which stabilizes the base potential and suppresses high-frequency interference. The collector of the first transistor is connected to a first inductor, which is designed to form an oscillation circuit. Its inductance can be selected according to the target frequency to adjust the output frequency. To improve signal quality, the first transistor uses capacitor feedback, i.e., it is connected to the base via a first capacitor, thereby forming a self-excited oscillation mode and ensuring good signal stability. Furthermore, the emitter of the first transistor is grounded via a third resistor to adjust the current and prevent transistor overload. This design ensures that the output signal is not only stable but also meets the input characteristic requirements for driving subsequent circuits. The buffer isolation unit consists of a second transistor, a second resistor, and a fourth resistor, mainly used to realize signal isolation between the oscillation signal generation unit and the amplitude adjustment unit. The isolation and buffering structure prevents load changes from affecting the stability of the oscillation signal. For example, the base of the second transistor is connected to the oscillation signal generation part through the third capacitor and grounded through the second resistor to stabilize the base potential and suppress the influence of common-mode interference. The collector of the second transistor is directly connected to the positive terminal of the power supply to provide sufficient power voltage for subsequent circuits, while the emitter is grounded through the fourth resistor, which serves as a voltage divider and limits the current to simplify the design of subsequent circuits. This isolation and buffering structure not only ensures the integrity of the oscillation signal but also improves the anti-interference capability of the entire circuit system. The amplitude adjustment unit is based on a linear potentiometer. The first fixed terminal of the linear potentiometer is connected to the output point of the buffer isolation unit, i.e., the emitter of the second transistor. The second fixed terminal is grounded, and the sliding terminal is used to output the amplitude adjustment signal, thereby realizing the multi-level adjustable amplitude function. In this design, the sliding terminal of the linear potentiometer can change the voltage amplitude of the output signal according to the manual or automatic adjustment method to meet the requirements of the atomization effect.For example, when controlling the position of the sliding end, the required amplitude range can be output according to different atomization fineness requirements. This design uses a high-precision potentiometer to ensure the accuracy of the output signal adjustment range and avoid instability caused by poor contact during adjustment. The power amplification unit amplifies the signal output from the amplitude adjustment unit to meet the operating requirements of the ultrasonic transducer. The base of the third transistor is connected to the sliding end of the linear potentiometer and grounded through the fifth resistor. This design prevents DC bias interference, thus stabilizing the amplification effect. The emitter of the third transistor is grounded through the sixth resistor to stabilize the current, while the collector is connected to the positive terminal of the power supply through the second inductor to provide the energy required to drive the transducer. Matching the design with the fourth capacitor prevents high-frequency component leakage and optimizes... The output waveform is also shown. Furthermore, the collector is connected to the fifth capacitor, whose positive terminal serves as the final output terminal, ensuring stable driving of the ultrasonic transducer. In the preferred embodiment, a high-power transistor is selected as the power amplification element to ensure sufficient output driving capability while avoiding power loss. By introducing multi-level amplitude adjustment functionality into the circuit design, the needs of different atomization application scenarios can be precisely met. Simultaneously, through modular structural design, such as the feedback design of the oscillation signal generation unit, signal isolation of the buffer isolation unit, and the high-precision adjustable function of the amplitude adjustment unit, not only is the stability of the entire circuit improved, but the ease of use is also greatly enhanced. In addition, the optimized design of the power amplification unit ensures efficient signal amplification and effective energy transfer, laying a solid foundation for driving the ultrasonic transducer.

[0023] Furthermore, the capacitance values ​​of the first capacitor (C1) and the second capacitor (C2) of the oscillation signal generation unit are 100pF and 10nF, respectively; the inductance value of the first inductor (L1) is 1mH; the resistance value of the first resistor (R1) is 10kΩ; and the resistance value of the third resistor (R3) is 100Ω.

[0024] As a preferred embodiment of the above, the oscillation signal generation unit is used to improve the stability and accuracy of the oscillation signal. Specifically, the capacitance of the first capacitor is set to 100 picofarads. This relatively small capacitor selection provides fast charging and discharging capability, which helps to improve the sensitivity of high-frequency oscillation signal generation. The capacitance of the second capacitor is set to 10 nanofarads, which can effectively filter out high-frequency components and stabilize the base potential, thereby maintaining the purity of the oscillation signal. This combination ensures the good quality of the oscillation circuit when generating high-frequency signals and reduces the possibility of phase drift. In addition, the inductance of the first inductor is selected to be 1 millihenry. This is to provide an appropriate inductance in the oscillation circuit to ensure that the resonance condition of the circuit at a specific frequency is met. The inductance value is... The signal oscillation frequency is set, and the LC oscillator formed by combining it with the capacitor ensures the frequency stability and waveform validity of the signal. To ensure the overall current stability of the circuit, a 10 kΩ resistor is selected for the first resistor, which can limit the base current and reduce the dependence on the power supply. This design helps to maintain the first transistor in the best working state and also effectively extends the service life of the component. Complementing this, the 100 Ω resistor of the third resistor is grounded through the emitter to control the stable output of the current and avoid the risk of damage caused by excessive current. The advantage of this parametric design is that it can maintain the stability of the circuit output under standard working environment and deviating conditions, and adapt to the atomization effect requirements under various working conditions.

[0025] Furthermore, the second resistor (R2) of the buffer isolation unit has a resistance of 10kΩ, and the fourth resistor (R4) has a resistance of 1kΩ; the second transistor (Q2) is configured as an emitter follower with an input impedance greater than 100kΩ.

[0026] As a preferred embodiment of the above, the buffer isolation unit is implemented by a combination of a second transistor configured as an emitter follower and a resistor of a special value. The second transistor is configured as an emitter follower, which has the advantages of high input impedance and low output impedance, representing an improvement in impedance matching and signal isolation in the circuit design. Specifically, by adjusting the internal connection relationship, the input impedance of the second transistor is configured to be greater than 100 kΩ, achieving the purpose of suppressing the input signal load effect and effectively preventing interference from external circuits from affecting signal transmission. To ensure the input impedance characteristics and achieve the designed buffering purpose, the resistance value of the second resistor is selected as 10 kΩ, which plays a role in stabilizing the base potential of the second transistor and reducing the influence of input bias current on the signal. This complementary structure uses a fourth resistor of 1 kΩ, primarily connected from the emitter of the second transistor to ground, to precisely control the output voltage and optimize the current loop of the emitter follower structure. Thus, the entire unit achieves effective isolation and excellent dynamic response characteristics while ensuring signal integrity. The core of the emitter follower structure lies in its ability to drive high-impedance signal sources without affecting the stability of the preceding signals. This configuration allows the input signal generated by the oscillation signal generation unit to be transmitted to the subsequent amplitude adjustment unit with low distortion and high bandwidth after passing through the buffer isolation unit, thereby ensuring the stable and efficient operation of the entire circuit system. Furthermore, the emitter follower's lossless nature reduces the power consumption requirements of subsequent circuits.

[0027] Furthermore, the linear potentiometer (RV1A) of the amplitude adjustment unit has a resistance of 10kΩ; there is no series resistance between the sliding end of the linear potentiometer and the base of the third transistor (Q3).

[0028] As a preferred embodiment, the linear potentiometer has a resistance of 10 kΩ. This specification is chosen to enhance the smoothness and accuracy of electrical adjustment. Specifically, this resistance value not only meets the needs of conventional voltage distribution but also maintains a stable operating feel during fine electrical adjustments, ensuring flexible control of the output signal amplitude. In terms of the physical connection of the linear potentiometer, the sliding end is directly connected to the base of the third transistor, eliminating the series resistor configuration commonly found in traditional designs, thereby reducing voltage drop and delay in the signal path. This preferred implementation of resistor-free direct connection ensures that the voltage change adjusted by the potentiometer can quickly and without attenuation affect the base potential of the transistor, thereby achieving rapid adjustment of the output amplitude. By eliminating the series resistor, the output voltage of the potentiometer's sliding end can directly and quickly affect the switching state of the third transistor, effectively improving the circuit's response speed.

[0029] Furthermore, the fourth capacitor (C4) of the power amplifier unit has a capacitance of 100pF, the fifth capacitor (C5) has a capacitance of 10nF, and the second inductor (L2) has an inductance of 100μH.

[0030] As a preferred embodiment of the above, in the design of the power amplification unit, the fourth capacitor, the fifth capacitor, and the second inductor constitute a filtering and circuit stabilization module to ensure the quality of the circuit signal and the stability and efficiency of the output power. First, the capacitance value of the fourth capacitor is set to 100 picofarads. This relatively small capacitance value is mainly used to filter out rapidly changing high-frequency secondary signals and spike noise in the circuit. This capacitor is directly connected in parallel between the collector of the third transistor and ground, effectively reducing the high-frequency interference noise that may be generated during the operation of the transistor and optimizing the ripple characteristics of the output signal, thereby ensuring the purity of the signal waveform. The capacitance value of the fifth capacitor is set to 10 nanofarads and connected to the output terminal of the collector of the third transistor to improve the load electrical characteristics of the driving ultrasonic transducer. The larger capacitance value gives the fifth capacitor a higher energy storage capacity, which can stabilize the circuit during operation. The signal amplitude is controlled to prevent amplitude fluctuations under high-power loads. Furthermore, the fifth capacitor effectively adjusts the matching characteristics between the signal and the power load, ensuring stable operation of the atomizer within the design frequency range. The second inductor, with an inductance of 100 microhenries, is connected to the collector of the third transistor and the power supply, forming a high-frequency resonant energy storage device. The second inductor limits the rate of current change, preventing instantaneous current variations from affecting the transistor and load. The inductor selection is based on the resonant conditions of the target design frequency; its optimal value allows the circuit system to achieve optimal response and minimum power loss within the operating frequency range. Additionally, the second inductor provides electromagnetic isolation in the drive circuit, improving the circuit's anti-interference capability and optimizing overall power consumption.

[0031] Furthermore, the fifth resistor (R5) of the power amplifier unit has a resistance of 10kΩ, and the sixth resistor (R6) has a resistance of 470Ω; there is no series resistance between the collector of the third transistor (Q3) and the second inductor (L2).

[0032] As a preferred embodiment, the fifth resistor (R5) is set to a resistance of 10 kΩ. This resistor is mainly used to stabilize the base potential of the third transistor (Q3), which can effectively control the base current, so that the transistor operates in the optimal amplification state, and at the same time prevent the transistor from being overloaded or even damaged due to excessive base current, thereby ensuring the stability and safety of signal amplification. The sixth resistor (R6) is set to a resistance of 470 Ω, which is connected between the emitter of the third transistor and ground. This configuration plays a role in current control and stabilization. Especially in high-power operating mode, it can effectively limit the current through the transistor and avoid damage to sensitive components. At the same time, combined with the control of base current, the voltage and current across the transistor are ideally matched and the output is stable. In this embodiment, the advantage of the design of no series resistor between the collector of the third transistor and the second inductor (L2) is that it reduces unnecessary losses in the signal path, so that the signal is directly transmitted from the collector of the transistor to the inductor, thereby maintaining high efficiency in the power transfer process.

[0033] Furthermore, both the third capacitor (C3) and the fifth capacitor (C5) are electrolytic capacitors; the third capacitor (C3) has a capacitance of 1μF, and the fifth capacitor (C5) has a capacitance of 10nF.

[0034] As a preferred embodiment of the above, both the third capacitor and the fifth capacitor adopt an electrolytic capacitor structure. This structure is chosen based on its advantages such as high capacity, low cost, and stable performance. Specifically, the third capacitor is selected with a capacitance of 1 microfarad to stabilize the collector potential of the oscillation signal generation unit. This capacitance value allows for rapid charging and discharging, ensuring stable circuit operation during oscillation signal generation and suppressing the impact of small voltage fluctuations on signal quality during circuit switching. Furthermore, the electrolytic capacitor's large capacitance range and high energy storage capacity significantly optimize the continuity of oscillation signal generation, preventing frequency drift or signal interruption due to insufficient capacitance. The fifth capacitor, with a capacitance of 10 nanofarads, is connected in the path from the collector of the third transistor to the ultrasonic transducer. The advantage of this electrolytic capacitor in this position is its ability to effectively filter high-frequency noise in the power output and adjust the waveform of the output signal to better drive the ultrasonic transducer. Since the transducer has high requirements for input signal quality, the fifth capacitor further improves the purity of the output signal, giving it better stability and lower noise levels. Under certain conditions, this specific capacitance value of the electrolytic capacitor can also reduce interference effects in signal transmission, thereby improving the transducer's atomization effect.

[0035] Furthermore, the first transistor (Q1), the second transistor (Q2), and the third transistor (Q3) are all model 2N2222; the positive power supply (VCC) is a 12V DC power supply.

[0036] As a preferred embodiment, all transistors used are of the 2N2222 type. This type of transistor has high performance indicators, including low saturation voltage, fast switching characteristics, and high current handling capability, and possesses excellent thermal stability. This invention uses a 12V DC power supply as the system drive power supply. In practical applications, this power supply method not only has good adaptability in conventional circuit designs, but is also a common requirement for ultrasonic atomizers, enabling sufficient power output with a relatively low voltage.

[0037] Furthermore, the frequency of the circuit output signal is determined by the first inductor (L1), the first capacitor (C1), and the second capacitor (C2); there is no additional matching circuit between the output terminal and the ultrasonic transducer.

[0038] As a preferred embodiment of the above, an oscillation circuit is formed by the inductance of the first inductor (L1) and the capacitance of the first capacitor (C1) and the second capacitor (C2), thereby ensuring stable signal generation and accurate frequency output. This can match the operating frequency band of the circuit and stably control the signal frequency within a specific range according to the characteristics of the ultrasonic transducer. This oscillation circuit, combined with the switching characteristics of the first transistor (Q1), enables the circuit to continuously generate oscillations and maintain the quality of the output signal.

[0039] Furthermore, the amplitude adjustment unit uses a single linear potentiometer (RV1A) to divide the signal voltage.

[0040] As a preferred embodiment of the above, the voltage division ratio of the internal resistor of the potentiometer is changed by physically adjusting the sliding end, thereby outputting control signals of different amplitudes.

[0041] Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A multi-level amplitude adjustable ultrasonic atomizer driving circuit, characterized in that, include: Oscillation signal generation unit, buffer isolation unit, amplitude adjustment unit, and power amplification unit; The oscillation signal generation unit includes a first transistor (Q1), a first inductor (L1), a first capacitor (C1), a second capacitor (C2), a third capacitor (C3), a first resistor (R1), and a third resistor (R3). The base of the first transistor (Q1) is connected to the positive terminal of the power supply (VCC) through the first resistor (R1) and grounded through the second capacitor (C2). The collector of the first transistor (Q1) is connected to the first terminal of the first inductor (L1), and the second terminal of the first inductor (L1) is connected to the positive terminal of the power supply (VCC). The collector of the first transistor (Q1) is also connected to the base of the first transistor (Q1) through the first capacitor (C1). The emitter of the first transistor (Q1) is grounded through the third resistor (R3). The collector of the first transistor (Q1) is connected to the positive terminal of the third capacitor (C3). The buffer isolation unit includes a second transistor (Q2), a second resistor (R2), and a fourth resistor (R4); the base of the second transistor (Q2) is connected to the negative terminal of the third capacitor (C3) and grounded through the second resistor (R2); the emitter of the second transistor (Q2) is grounded through the fourth resistor (R4); and the collector of the second transistor (Q2) is directly connected to the positive terminal of the power supply (VCC). The amplitude adjustment unit includes a linear potentiometer (RV1A); the first fixed terminal of the linear potentiometer (RV1A) is connected to the emitter of the second transistor (Q2); the second fixed terminal of the linear potentiometer (RV1A) is grounded; and the sliding terminal of the linear potentiometer (RV1A) outputs an amplitude adjustment signal. The power amplification unit includes a third transistor (Q3), a second inductor (L2), a fourth capacitor (C4), a fifth capacitor (C5), a fifth resistor (R5), and a sixth resistor (R6). The base of the third transistor (Q3) is connected to the sliding terminal of the linear potentiometer (RV1A) and grounded through the fifth resistor (R5). The emitter of the third transistor (Q3) is grounded through the sixth resistor (R6). The collector of the third transistor (Q3) is connected to the first terminal of the second inductor (L2), and the second terminal of the second inductor (L2) is connected to the positive terminal of the power supply (VCC). The collector of the third transistor (Q3) is also grounded through the fourth capacitor (C4). The collector of the third transistor (Q3) is connected to the positive terminal of the fifth capacitor (C5), and the negative terminal of the fifth capacitor (C5) serves as the output terminal to drive the ultrasonic transducer.

2. The multi-level amplitude adjustable ultrasonic atomizer driving circuit according to claim 1, characterized in that, The first capacitor (C1) and the second capacitor (C2) of the oscillation signal generation unit have capacitance values ​​of 100pF and 10nF, respectively; the first inductor (L1) has an inductance value of 1mH; the first resistor (R1) has a resistance value of 10kΩ; and the third resistor (R3) has a resistance value of 100Ω.

3. The multi-level amplitude adjustable ultrasonic atomizer driving circuit according to claim 1, characterized in that, The second resistor (R2) of the buffer isolation unit has a resistance of 10kΩ, and the fourth resistor (R4) has a resistance of 1kΩ; the second transistor (Q2) is configured as an emitter follower with an input impedance greater than 100kΩ.

4. The multi-level amplitude adjustable ultrasonic atomizer driving circuit according to claim 1, characterized in that, The linear potentiometer (RV1A) of the amplitude adjustment unit has a resistance of 10kΩ; there is no series resistance between the sliding end of the linear potentiometer and the base of the third transistor (Q3).

5. The multi-level amplitude adjustable ultrasonic atomizer driving circuit according to claim 1, characterized in that, The fourth capacitor (C4) of the power amplifier unit has a capacitance of 100pF, the fifth capacitor (C5) has a capacitance of 10nF, and the second inductor (L2) has an inductance of 100μH.

6. The multi-level amplitude adjustable ultrasonic atomizer driving circuit according to claim 1, characterized in that, The fifth resistor (R5) of the power amplifier unit has a resistance of 10kΩ, and the sixth resistor (R6) has a resistance of 470Ω; there is no series resistance between the collector of the third transistor (Q3) and the second inductor (L2).

7. The multi-level amplitude adjustable ultrasonic atomizer driving circuit according to claim 1, characterized in that, Both the third capacitor (C3) and the fifth capacitor (C5) are electrolytic capacitors; the third capacitor (C3) has a capacitance of 1μF and the fifth capacitor (C5) has a capacitance of 10nF.

8. The multi-level amplitude adjustable ultrasonic atomizer driving circuit according to claim 1, characterized in that, The first transistor (Q1), the second transistor (Q2), and the third transistor (Q3) are all model 2N2222; the positive terminal of the power supply (VCC) is a 12V DC power supply.

9. The multi-level amplitude adjustable ultrasonic atomizer driving circuit according to claim 1, characterized in that, The frequency of the circuit output signal is determined by the first inductor (L1), the first capacitor (C1), and the second capacitor (C2); there is no additional matching circuit between the output terminal and the ultrasonic transducer.

10. The multi-level amplitude adjustable ultrasonic atomizer driving circuit according to claim 1, characterized in that, The amplitude adjustment unit uses a single linear potentiometer (RV1A) to divide the signal voltage.

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