Ultrasonic drive circuit and device thereof

Abstract

An ultrasonic drive circuit relates to the technical field of control circuits. The circuit comprises a control circuit, a driving circuit and a feedback circuit, the output end of the feedback circuit is connected with the first control end of the control circuit, the control circuit is connected with the control end of the driving circuit, the output end of the driving circuit is connected with the feedback circuit, and the feedback circuit is used for detecting the voltage of the output end of the driving circuit. The feedback circuit is used for detecting and responding to the voltage change of the output end of the driving circuit and outputting a first feedback signal based on the voltage of the output end, and the control circuit is used for controlling the opening and closing of the control circuit according to the first feedback signal. And the reaction speed and the operation efficiency of the whole system are greatly improved.

Description

Technical Field

[0001] The utility model relates to the technical field of control circuits, and particularly relates to an ultrasonic driving circuit and a device thereof. Background Art

[0002] Due to its unique high-frequency sound wave characteristics, ultrasonic technology has played an important role in multiple fields. In the medical field, ultrasonic waves are used for in-vivo imaging and diagnosis, such as echocardiography and other tissue imaging. In industrial applications, ultrasonic technology is used for material detection, cleaning, and accelerating chemical reaction processes. In addition, ultrasonic waves are widely used in consumer electronics, such as in certain cleaning devices and distance sensors.

[0003] Although existing ultrasonic waves have been widely used in multiple fields, there are still some deficiencies. For example, the existing ultrasonic driving circuit lacks an effective closed-loop control, and the interaction between circuits is usually open-loop, that is, there is no real-time feedback adjustment mechanism to ensure the accuracy and stability of the output. Once the environment changes or the performance of the device itself fluctuates, the system cannot automatically adjust, thus affecting the final ultrasonic wave generation and its quality. Summary of the Utility Model

[0004] An object of the utility model is to provide an ultrasonic driving circuit aiming at the defects and deficiencies of the prior art. On the one hand, the ultrasonic driving circuit is characterized by comprising a control circuit, a driving circuit, and a feedback circuit. The output end of the feedback circuit is connected to the first control end of the control circuit. The control circuit is connected to the control end of the driving circuit. The output end of the driving circuit is connected to the feedback circuit. The feedback circuit is used for detecting the output voltage of the driving circuit and outputting a first feedback signal based on the output voltage. The control circuit is used for controlling the opening and closing of the control circuit according to the first feedback signal.

[0005] The driving circuit includes a switching module, a high-frequency inductor module, and a load module. The switching module includes a first switching transistor and a second switching transistor. The load module includes a first ultrasonic oscillator and a first resistor. The feedback circuit includes a first voltage comparator and a second resistor. The first output terminal of the control circuit is connected to the control terminal of the first switching transistor. The second output terminal of the control circuit is connected to the control terminal of the second switching transistor. The first conduction terminals of the first switching transistor and the second switching transistor are connected to the high-frequency inductor module. The second conduction terminals of the first switching transistor and the second switching transistor are connected to the third output terminal and the fourth output terminal of the control circuit and grounded. One end of the first ultrasonic oscillator is connected to the high-frequency inductor module, and the other end is connected to one end of the first resistor and the first input terminal of the first voltage comparator. The other end of the first resistor is connected to the second input terminal and the third input terminal of the first voltage comparator. The first output terminal and the second output terminal of the first voltage comparator are connected to one end of the second resistor. The other end of the second resistor is connected to the third output terminal of the first voltage comparator. The third output terminal of the voltage comparator outputs the first feedback signal.

[0006] The feedback circuit includes a first capacitor. One end of the first capacitor is connected to one end of the second resistor, the first output terminal, and the second output terminal of the first voltage comparator. The other end of the first capacitor is grounded. The load module further includes a second capacitor, and the second capacitor is connected in parallel with the first ultrasonic oscillator.

[0007] The high-frequency inductor module includes a first transformer and a first inductor. The primary side of the first transformer is connected to the drains of the first switching transistor and the second switching transistor. One end of the secondary side of the first transformer is connected to the first inductor, and the other end is connected to the other end of the first resistor. The other end of the first inductor is connected to one end of the first ultrasonic oscillator.

[0008] It further includes a voltage source circuit and a main control chip. The output terminal of the voltage source circuit is connected to the power input terminals of the main control chip, the control circuit, and the feedback circuit. The output terminal of the main control chip is connected to the second control terminal of the control circuit. The voltage source circuit is used to output a voltage of 24 - 5V.

[0009] The main control chip includes a first port and a second port. The first port is connected to the control circuit and the feedback circuit. The main control chip receives the first output signal of the feedback circuit through the first port. The second port is connected to the control circuit. The main control chip controls the on / off of the control circuit through the second port.

[0010] The control circuit further includes a third resistor and a third capacitor. The control circuit further includes a fourth port and an eighth port. The eighth port is used to output a first driving voltage. The fourth port is used to receive the second output signal of the second port. One end of the third resistor is connected to the fourth port, and the other end is connected to one end of the third capacitor and the ground terminal. The other end of the third capacitor is connected to the eighth port.

[0011] The control circuit further includes a fifth port and a sixth port. The control circuit controls the first switching transistor through the fifth port and controls the second switching transistor through the sixth port.

[0012] The control circuit further includes the fourth resistor and the fifth resistor. The fourth resistor is located between the fifth port and the drain of the first switching transistor, and the fifth resistor is located between the sixth port and the drain of the second switching transistor.

[0013] On the other hand, the present invention further provides an ultrasonic driving device, including the ultrasonic driving circuit of the above technical solution.

[0014] By adopting the feedback circuit in the embodiment of the present invention, the voltage change at the output end of the driving circuit can be detected and responded more quickly, greatly improving the reaction speed and operation efficiency of the overall system. Secondly, in the present invention, the control circuit optimizes the switching of the control circuit according to the feedback signal, effectively reducing the energy consumption and improving the energy efficiency management, not only reducing the energy waste, but also helping to extend the service life of the device. Description of the Drawings

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0016] Figure 1 It is a structural block diagram of the first embodiment of the present invention;

[0017] Figure 2 It is a circuit diagram of the control circuit, the driving circuit and the feedback circuit of the second embodiment of the present invention;

[0018] Figure 3 It is a pin diagram of the main control chip of the second embodiment of the present invention;

[0019] Figure 4 It is a circuit diagram of the voltage source circuit of the second embodiment of the present invention;

[0020] Figure 5 It is the circuit diagram of other circuits in the second embodiment of the present utility model.

[0021] Reference numerals:

[0022] 1. Control circuit;

[0023] 2. Drive circuit; 21. Switch module; 22. High-frequency inductor module; 23. Load module;

[0024] 3. Feedback circuit;

[0025] 4. Voltage source circuit;

[0026] 5. Main control chip. Specific implementation manner

[0027] The present utility model will be further described in detail below with reference to the accompanying drawings.

[0028] This specific embodiment is only an interpretation of the present utility model, and it is not a limitation of the present utility model. After reading this specification, those skilled in the art can make modifications to this embodiment without creative contributions as needed, but as long as they are within the scope of the claims of the present utility model, they are protected by the patent law.

[0029] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. Usually, the components of the embodiments of the present utility model described and illustrated herein can be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the present utility model provided in the drawings is not intended to limit the scope of the claimed present utility model, but merely represents selected embodiments of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present utility model.

[0031] Embodiment 1:

[0032] Refer to Figure 1, an ultrasonic driving circuit is proposed, which includes a control circuit 1, a driving circuit 2 and a feedback circuit 3. The output end of the feedback circuit 3 is connected to the first control end of the control circuit 1. The control circuit 1 is connected to the control end of the driving circuit 2. The output end of the driving circuit 2 is connected to the feedback circuit 3. The feedback circuit 3 is used to detect the output voltage of the driving circuit 2 and output a first feedback signal based on the output voltage. The control circuit 1 is used to control the on and off of the control circuit 1 according to the first feedback signal.

[0033] In the first embodiment of the present utility model, by adopting a feedback circuit, the voltage change at the output end of the driving circuit can be detected and responded to more quickly, greatly improving the reaction speed and operation efficiency of the overall system. Secondly, in the present utility model, the control circuit optimizes the switch of the control circuit according to the feedback signal, effectively reducing the energy consumption and improving the energy efficiency management. It not only reduces the energy waste but also helps to extend the service life of the equipment.

[0034] Embodiment 2:

[0035] Referring to Figures 2 - 5 , an ultrasonic driving circuit is proposed. Among them, the driving circuit 2 includes a switch module 21, a high-frequency inductance module 22 and a load module 23. The switch module 21 includes a first switching tube Q1 and a second switching tube Q2. The load module 23 includes a first ultrasonic vibrator Y1 and a first resistor R23. The feedback circuit 3 includes a first voltage comparator U5 and a second resistor R19. The first output end of the control circuit 1 is connected to the control end of the first switching tube Q1. The second output end of the control circuit 1 is connected to the control end of the second switching tube Q2. The first conduction ends of the first switching tube Q1 and the second switching tube Q2 are connected to the high-frequency inductance module 22. The second conduction ends of the first switching tube Q1 and the second switching tube Q2 are connected to the third output end and the fourth output end of the control circuit 1 and grounded. One end of the first ultrasonic vibrator Y1 is connected to the high-frequency inductance module 22, and the other end is connected to one end of the first resistor R23 and the first input end of the first voltage comparator U5. The other end of the first resistor R23 is connected to the second input end and the third input end of the first voltage comparator U5. The first output end and the second output end of the first voltage comparator U5 are connected to one end of the second resistor R19. The other end of the second resistor R19 is connected to the third output end of the first voltage comparator U5. The third output end of the voltage comparator outputs the first feedback signal.

[0036] The control circuit 1 is used to control the first switching transistor Q1 and the second switching transistor Q2 to conduct alternately. The high-frequency inductor module 22 generates alternating current under the alternating conduction of the first switching transistor Q1 and the second switching transistor Q2, and then drives the first ultrasonic oscillator Y1. The first input terminal, the second input terminal, and the third input terminal of the first voltage comparator U5 are used to detect the voltage across the first resistor R23. When the voltage at the first input terminal is greater than the voltage at the second input terminal, the third output terminal outputs a first voltage value. When the voltage at the first input terminal is less than the voltage at the second input terminal, the third output terminal outputs a second voltage value.

[0037] In this embodiment, a switching module, a high-frequency inductor module, and a load module are adopted, effectively improving the efficiency and stability of ultrasonic driving: The switching module includes the first and second switching transistors Q2. The first and second switching transistors Q2 conduct alternately and generate alternating current through the high-frequency inductor module to drive the ultrasonic oscillator, which not only optimizes the conversion efficiency of electrical energy but also reduces energy loss. The first ultrasonic oscillator Y1 in the load module is directly connected to the high-frequency inductor, ensuring the effective transmission of ultrasonic waves and the stability of the intensity. Through the precise voltage detection of the first voltage comparator U5, the circuit state can be adjusted in real time to cope with different working conditions, ensuring the high performance and long-term stable operation of the entire system.

[0038] Specifically, the original switching transistors are MOSFETs or IGBTs, which further improve the circuit response speed and reduce heat loss. For the high-frequency inductor module, inductors made of ferrite or nanocrystalline materials with higher saturation current and lower DC resistance can also be considered to improve their performance at high frequencies. In addition, the existing voltage comparator can be replaced with an operational amplifier with higher precision and faster response speed to enhance the signal processing ability and stability of the overall circuit.

[0039] With this configuration, the current monitoring and protection module not only enhances the safety and stability of the circuit but also improves its adaptability to complex working conditions, enabling the ultrasonic driving circuit to maintain efficient and stable output during long-term operation or under different load conditions.

[0040] The feedback circuit 3 includes a first capacitor C8. One end of the first capacitor C8 is connected to one end of the second resistor R19, the first output terminal, and the second output terminal of the first voltage comparator U5. The other end of the first capacitor C8 is grounded. The load module 23 further includes a second capacitor CB1, and the second capacitor CB1 is connected in parallel with the first ultrasonic oscillator Y1.

[0041] In this embodiment, the first capacitor C8 provides a decoupling and stability function for the output terminal of the first voltage comparator U5, ensuring the stability of the signal output by the comparator, thereby improving the response speed and accuracy of the entire ultrasonic drive circuit. The second capacitor CB1 is connected in parallel with the first ultrasonic oscillator Y1 and is used to smooth the drive voltage of the oscillator, reduce voltage fluctuations, and further improve the continuity and stability of ultrasonic output.

[0042] Specifically, the first capacitor C8 can be replaced with a ceramic capacitor with a higher operating frequency and a lower equivalent series resistance (ESR) to improve the overall performance and durability of the circuit. The second capacitor CB1 can consider using a polymer capacitor, which has better frequency characteristics and higher voltage stability, and helps to improve the efficiency and lifespan of the ultrasonic oscillator.

[0043] As a preference rather than a limitation, it further includes a temperature sensor. The temperature sensor is connected near the first and second switching transistors Q2 and is used to monitor the temperature of the circuit in real time, enabling the user to observe the load condition at any time.

[0044] The high-frequency inductor module 22 includes a first transformer T2 and a first inductor L2. The primary side of the first transformer T2 is connected to the drains of the first switching transistor Q1 and the second switching transistor Q2. One end of the secondary side of the first transformer T2 is connected to the first inductor L2, and the other end is connected to the other end of the first resistor R23. The other end of the first inductor L2 is connected to one end of the first ultrasonic oscillator Y1.

[0045] In this embodiment, the first transformer T2 significantly improves the effective conversion and transfer of energy: the primary side of the first transformer T2 is connected to the switching transistor, which improves the efficiency during the energy conversion process and reduces voltage loss. At the same time, the secondary side is connected to the first inductor L2, which not only enhances the filtering ability of the circuit but also helps to smooth the output voltage, thereby ensuring that the first ultrasonic oscillator Y1 receives a stable drive signal. The function of the first resistor R23 is to sample and convert the current signal flowing through the ultrasonic oscillator into a voltage signal.

[0046] Specifically, the first transformer T2 can be a choke coil or a small transformer to further reduce the volume and improve the energy transfer efficiency. The first inductor L2 can also be a high-frequency inductor. The high-frequency inductor has a small volume and a fast response speed, is suitable for high-frequency applications, and improves the integration and performance of the overall circuit.

[0047] It also includes a voltage source circuit 4 and a main control chip 5. The output end of the voltage source circuit 4 is connected to the power input ends of the main control chip 5, the control circuit 1, and the feedback circuit 3. The output end of the main control chip 5 is connected to the second control end of the control circuit 1. The voltage source circuit 4 is used to output a voltage of 24V - 3.6V, and under normal circumstances, it outputs voltages of 24V, 12V, 5V, and 3.6V.

[0048] As a preference rather than a limitation, due to component limitations, the voltage source circuit 4 of this embodiment outputs 12V / 5V voltage.

[0049] In this embodiment, the voltage source circuit 4 is responsible for providing a stable voltage output of 24V - 3.6V to supply the main control chip 5, the control circuit 1, and the feedback circuit 3, ensuring that the power supply of the entire system is both stable and reliable, and helping to maintain the normal operation and interaction of each part of the circuit.

[0050] By receiving a stable power input, the main control chip 5 can effectively execute its processing tasks, precisely control the control circuit 1 through its output end, and optimize the performance and response speed of the entire ultrasonic emission system. In addition, the stable output of the voltage source circuit also helps to improve the accuracy of the feedback circuit, further enhancing the function of the overall circuit.

[0051] Specifically, the AC input and filtering part:

[0052] F1: Fuse, used for overcurrent protection.

[0053] ZD1: Varistor, used for overvoltage protection.

[0054] BD1: Bridge rectifier, converting the AC input into a DC voltage.

[0055] C1: Input filter capacitor, used to reduce the ripple of the input voltage.

[0056] Power regulation module:

[0057] U1 (CRE63599): PWM controller, responsible for generating a pulse width modulation signal used to drive the switch converter.

[0058] L1: Inductor, working together with the switch controller to improve the EMC anti-interference level.

[0059] R4, CE2: Feedback network used to stabilize and adjust the output voltage.

[0060] Switch protection module:

[0061] Q1, Q2: Power transistors, serving as switching elements, turning on or off according to the control signal of the PWM controller.

[0062] D1, D2: Diodes, used for rectification and providing a free commutation path.

[0063] Output adjustment module:

[0064] U4 (LM7805): Linear voltage regulator, providing a stable +5V output.

[0065] CE3, CE4, C6: Output filter capacitors, used for smoothing the output voltage and reducing output ripple.

[0066] R14, R15, U7 (TL431): Form an adjustable reference voltage source, used for precisely controlling the output voltage.

[0067] Isolation feedback module:

[0068] T1: Transformer, providing electrical isolation and used for the transmission of feedback signals.

[0069] U2 (EL817): Optocoupler, used for isolating the input and output, and at the same time transmitting the feedback signal.

[0070] Among them, after the AC input passes through F1 and ZD1 to provide overcurrent and overvoltage protection, it is rectified into direct current by BD1. The rectified direct current is preliminarily filtered by C1, and then supplied to the input of U1. U1 generates a PWM signal to control the switching actions of Q1 and Q2, generates the required high-frequency voltage through L1, and finally forms a relatively smooth DC output through the rectification and filtering of D1 and D2. The voltage of the output part is supplied to U7 through R14 and R15. U7 adjusts and stabilizes the final output voltage, and is further adjusted to a stable +5V output through U4. The feedback signal is sent back to U1 through T1 and U2, used to adjust the PWM signal to control the stability of the output voltage.

[0071] The main control chip 5 includes a first port and a second port. The first port is connected to the control circuit 1 and the feedback circuit 3. The first port is used to receive the first output signal of the feedback circuit 3. The second port is connected to the control circuit 1. The second port is used to control the on / off of the control circuit 1.

[0072] In this embodiment, the introduction of the main control chip 5 significantly enhances the control ability and response speed of the entire system: by receiving the output signal from the feedback circuit 3 through its first port, the main control chip can monitor and adjust the working state of the circuit in real time to ensure the stability and accuracy of the power output. The second port directly controls the on / off of the control circuit 1, making the switching operation of the system faster and more precise, thereby improving the safety and reliability of the circuit, not only optimizing the dynamic adjustment ability of the circuit, but also reducing the response delay and enhancing the efficiency of the overall circuit.

[0073] The control circuit 1 further includes a third resistor 20 and a third capacitor C7. The control circuit 1 further includes a fourth port and an eighth port. The eighth port is used to output a first driving voltage. The fourth port is used to receive the second output signal of the second port. One end of the third resistor 20 is connected to the fourth port, and the other end is connected to one end of the third capacitor C7 and the ground terminal. The other end of the third capacitor C7 is connected to the eighth port.

[0074] In this embodiment, the third resistor 20 and the third capacitor C7 in the control circuit 1 form a filtering network for processing the second output signal received from the second port, which helps to stabilize and smooth the output signal, thereby optimizing the quality and responsiveness of the driving voltage. After the fourth port receives the signal, through the processing of the third resistor 20 and the capacitor, the high-frequency noise and spikes in the signal are removed, ensuring that the first driving voltage output by the eighth port is more stable, thereby improving the reliability and efficiency of the entire system and reducing the sensitivity of the circuit to external interference.

[0075] Specifically, the third capacitor C7 can be a ceramic capacitor or a thin-film capacitor. The ceramic capacitor or the thin-film capacitor can not only optimize the signal processing effect, but also enhance the stability and long-term reliability of the circuit under various environmental conditions.

[0076] The control circuit 1 further includes a fifth port and a sixth port. The fifth port is used to control the first switching transistor Q1, and the sixth port is used to control the second switching transistor Q2.

[0077] In this embodiment, the fifth port and the sixth port in the control circuit 1 are specifically used to control the first and second switching transistors Q2, so that the circuit can independently adjust the conduction and cut-off of each switching transistor, optimize the driving signals of the switching transistors, and ensure that they perform switching operations in the correct time sequence, thereby maximizing the efficiency of the circuit and the quality of the output power.

[0078] In this embodiment, the first and second switching transistors Q2 can be MOSFETs or IGBTs to improve the response speed of the circuit and reduce heat loss.

[0079] The control circuit 1 further includes the fourth resistor R21 and the fifth resistor 22. The fourth resistor R21 is located between the fifth port and the drain of the first switching transistor Q1, and the fifth resistor 22 is located between the sixth port and the drain of the second switching transistor Q2.

[0080] In this embodiment, the setting of the fourth resistor R21 and the fifth resistor 22 provides the functions of current limiting and voltage stabilization for the switch tube drive signal, preventing excessive current from flowing into the switch tube, thereby protecting the switch tube from current impact. The fourth resistor R21 and the fifth resistor 22 are located between the control port and the switch tube, playing a buffering and protective role, ensuring that the switch tube works under safe and stable conditions, and enhancing the reliability and durability of the entire circuit.

[0081] Specifically, referring to the attached Figures 2 - 4 In this embodiment, the drive chip U3 divides the PWM signal fed back by the drive chip U5 into two signals to control the operation of two MOS transistors (Q1 and Q2). The third pin of the drive chip U3 is the control pin, which receives the control signal of the main control chip. When it is 0V, U5 does not work (both Q1 and Q2 are not conducting). When it is 5V, U5 starts to work (Q1 and Q2 conduct alternately).

[0082] The MOS transistors Q1 and Q2 conduct according to the drive signal of U3, and Q1 and Q2 conduct alternately when judging the operation.

[0083] Transformer T2 and inductor L2: Under the action of the alternating conduction signals of Q1 and Q2, a high-frequency and high-voltage alternating current (300V / 42KHz) is generated and output to the ultrasonic oscillator to drive Y1 to work;

[0084] The ultrasonic oscillator Y1 converts electrical energy into mechanical vibration. The matching capacitor CB1 makes the circuit work more stably. The sampling resistor R23 converts the alternating current signal flowing through the load of Y1 into a voltage signal and inputs it to the voltage comparator U5;

[0085] The voltage comparator U5 is used to detect the voltage situation across the sampling resistor R23, outputs a PWM signal (outputs 5V when the voltage of pin 1 > the voltage of pin 2, and outputs 0V when the voltage of pin 1 < the voltage of pin 2), and feeds this signal back to U3.

[0086] The above is only used to illustrate the technical solution of the present invention and not to limit it. Other modifications or equivalent replacements made by those of ordinary skill in the art to the technical solution of the present invention shall be covered within the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solution of the present invention.

Claims

1. An ultrasonic driving circuit, characterized in that: The invention comprises a control circuit (1), a drive circuit (2) and a feedback circuit (3), wherein the output end of the feedback circuit (3) is connected to the first control end of the control circuit (1), the control circuit (1) is connected to the control end of the drive circuit (2), the output end of the drive circuit (2) is connected to the feedback circuit (3), the feedback circuit (3) is used to detect the output end voltage of the drive circuit (2) and output a first feedback signal based on the output end voltage, and the control circuit (1) is used to control the on and off of the control circuit (1) according to the first feedback signal.

2. An ultrasonic driving circuit according to claim 1, characterized in that: The driving circuit (2) comprises a switch module (21), a high-frequency inductance module (22) and a load module (23); the switch module (21) comprises a first switch tube and a second switch tube; the load module (23) comprises a first ultrasonic vibrator and a first resistor; the feedback circuit (3) comprises a first voltage comparator and a second resistor; the first output end of the control circuit (1) is connected to the control end of the first switch tube; the second output end of the control circuit (1) is connected to the control end of the second switch tube; the first conduction ends of the first switch tube and the second switch tube are connected to the high-frequency inductance module (22); the second conduction ends of the first switch tube and the second switch tube are connected to the third output end and the fourth output end of the control circuit (1) and are grounded; one end of the first ultrasonic vibrator is connected to the high-frequency inductance module (22); the other end is connected to one end of the first resistor and the first input end of the first voltage comparator; the other end of the first resistor is connected to the second input end and the third input end of the first voltage comparator; the first output end and the second output end of the first voltage comparator are connected to one end of the second resistor; the other end of the second resistor is connected to the third output end of the first voltage comparator; the third output end of the voltage comparator outputs the first feedback signal.

3. An ultrasonic driving circuit according to claim 2, characterized in that: The feedback circuit (3) comprises a first capacitor, one end of the first capacitor is connected to one end of the second resistor, the first output end and the second output end of the first voltage comparator, and the other end of the first capacitor is grounded. The load module (23) also comprises a second capacitor, and the second capacitor is connected in parallel with the first ultrasonic vibrator.

4. An ultrasonic driving circuit according to claim 3, characterized in that: The high-frequency inductor module (22) comprises a first transformer and a first inductor, wherein the primary side of the first transformer is connected to the drains of the first switch tube and the second switch tube, one end of the secondary side of the first transformer is connected to the first inductor, and the other end is connected to the other end of the first resistor, and the other end of the first inductor is connected to one end of the first ultrasonic vibrator.

5. The ultrasonic driving circuit according to claim 1, characterized in that: It also comprises a voltage source circuit (4) and a main control chip (5), wherein the output end of the voltage source circuit (4) is connected to the power input end of the main control chip (5), the control circuit (1) and the feedback circuit (3), and the output end of the main control chip (5) is connected to the second control end of the control circuit (1); the voltage source circuit (4) is used to output a voltage of 24V-3.6V.

6. The ultrasonic driving circuit according to claim 5, characterized in that: The main control chip (5) comprises a first port and a second port, the first port being connected to the control circuit (1) and the feedback circuit (3), the main control chip (5) receiving a first output signal of the feedback circuit (3) via the first port, the second port being connected to the control circuit (1), and the main control chip (5) controlling the on / off of the control circuit (1) via the second port.

7. The ultrasonic driving circuit according to claim 6, characterized in that: The control circuit (1) further comprises a third resistor and a third capacitor, the control circuit (1) further comprises a fourth port and an eighth port, the eighth port is used to output a first driving voltage, the fourth port is used to receive a second output signal of the second port, one end of the third resistor is connected to the fourth port, the other end is connected to one end of the third capacitor and a ground terminal, and the other end of the third capacitor is connected to the eighth port.

8. The ultrasonic driving circuit according to claim 2, characterized in that: The control circuit (1) further comprises a fifth port and a sixth port, wherein the control circuit (1) controls the first switch tube via the fifth port, and the control circuit (1) controls the second switch tube via the sixth port.

9. The ultrasonic driving circuit according to claim 8, characterized in that: The control circuit (1) further comprises a fourth resistor and a fifth resistor, wherein the fourth resistor is located between the fifth port and the drain of the first switch tube, and the fifth resistor is located between the sixth port and the drain of the second switch tube.

10. An ultrasonic driving device, characterized in that: It comprises the ultrasonic drive circuit as described in any one of claims 1 to 9.

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