Ultrasonic transducer excitation circuit resonant frequency identification method, device and system

Abstract

The invention discloses an ultrasonic transducer excitation circuit resonant frequency identification method, device and system, and the method comprises the steps: providing short-time pulse input for an excitation circuit through a micro-control unit, so as to enable the excitation circuit to generate a square signal; inputting the square wave signal into a comparator, so that the comparator performs voltage comparison processing on the square wave signal to obtain a processed signal; performing low-pass filtering on the processed signal to obtain an amplitude value of the processed signal, if the amplitude value is greater than a preset amplitude value, determining the signal corresponding to the amplitude value as a resonant frequency excitation signal, exciting the ultrasonic transducer according to the resonant frequency excitation signal, and if the amplitude value is less than the preset amplitude value, updating the starting frequency of the micro-control unit, and the micro-control unit continues to provide short-time pulse input for the excitation circuit according to the updated starting frequency until the resonant frequency excitation signal is determined. According to the method, the accuracy of resonant frequency judgment is improved according to the waveform of the excitation voltage.

Description

Technical Field

[0001] The present invention relates to the technical field of ultrasonic transducers, and in particular to a method, device and system for identifying the resonant frequency of an ultrasonic transducer excitation circuit. Background Art

[0002] Ultrasonic therapy equipment uses the mechanical effect, thermal effect and physical and chemical effect of ultrasound to generate "endogenous heat" in the deep tissues of the human body, dilate local blood vessels, accelerate blood flow, enhance metabolism, reduce muscle tension, reduce pain, and increase the ductility of connective tissue, thereby promoting recovery from certain diseases. Ultrasonic therapy equipment treats the human body mainly by stimulating the ultrasonic transducer in the ultrasonic treatment head through the high-voltage pulse signal inside the ultrasonic therapy equipment, thereby generating ultrasonic emission to achieve the purpose of treatment. However, due to cost control, the bandwidth of ultrasonic transducers suitable for ultrasonic therapy is generally narrow, around 100KHz, and the frequency response curve is very steep near the resonant frequency point. In addition, its resonant frequency generally has a certain deviation from the nominal emission frequency. If the excitation frequency deviates slightly from its resonant frequency by about 10KHz, its emitted energy will be severely weakened and cannot reach the ultrasonic emission power expected by the equipment.

[0003] In view of this, two methods are generally used to solve the problem. The first is to use a swept frequency excitation signal to excite the ultrasonic transducer, that is, to use an excitation signal within a frequency band to excite the ultrasonic transducer. For example, the nominal resonant frequency of the ultrasonic transducer is 1MHz, so a swept frequency signal within a frequency band from 900KHz to 1.1MHz is used for excitation. There will always be a frequency that is closest to the actual resonant frequency of the ultrasonic transducer, which can enable the ultrasonic transducer to achieve the highest sound output. However, its defects are also obvious. The excitation signals of other frequencies are very inefficient, resulting in energy waste. Moreover, since no resonance is generated, the excitation signal is seriously reflected, which greatly affects the electromagnetic compatibility characteristics and product performance of the treatment equipment.

[0004] The second is to use impedance measurement technology to detect the resonance point, that is, to use several frequency excitation signals within the nominal frequency of the probe, first excite the probe, detect the resonance point by impedance measurement, obtain its resonance frequency, and then generate an excitation signal of the corresponding frequency, so that it can be targeted and maximize the energy near the resonance point, so that the ultrasonic probe can produce extremely high sound output under a low amplitude excitation signal. At present, there are many technologies for detecting the resonance point, such as the voltage method for detecting the voltage amplitude of the output excitation waveform, collecting a series of peak-peak values ​​of excitation signals of different frequencies near the resonance point, and taking the frequency with the largest corresponding peak-peak value as the excitation frequency closest to the resonance frequency; there is also the current method, that is, taking the frequency with the largest corresponding current as the excitation frequency closest to the resonance frequency; and finally the phase method, by comparing the phase relationship between voltage and current, find the frequency with the smallest phase difference between the two, which is the resonance frequency. However, due to the large differences in the impedance characteristics of the transducer near the resonance point, both the voltage method and the current method cannot accurately identify the resonance point of each transducer. Although the phase method is the gold standard, it involves more devices and is more expensive. In addition, current detection chips generally cannot achieve MHz-level bandwidths, which also limits their use. Summary of the invention

[0005] In order to solve the above technical problems, the embodiments of the present invention provide a method, device and system for identifying the resonant frequency of an ultrasonic transducer excitation circuit, which improves the accuracy of resonant frequency judgment based on the waveform of the excitation voltage.

[0006] A first aspect of an embodiment of the present invention provides a method for identifying a resonant frequency of an ultrasonic transducer excitation circuit, the method comprising:

[0007] The microcontroller unit is used to provide a short-time pulse input to the excitation circuit so that the excitation circuit generates a square wave signal;

[0008] Inputting the square wave signal into the comparator so that the comparator performs voltage comparison processing on the square wave signal to obtain a processed signal, wherein the processed signal is a high level signal or a low level signal;

[0009] The processed signal is low-pass filtered to obtain the amplitude of the processed signal. If the amplitude is greater than the preset amplitude, the signal corresponding to the amplitude is determined to be the resonant frequency excitation signal, and the ultrasonic transducer is excited according to the resonant frequency excitation signal. If the amplitude is less than the preset amplitude, the starting frequency of the microcontroller unit is updated so that the microcontroller unit continues to provide short-time pulse input to the excitation circuit according to the updated starting frequency until the resonant frequency excitation signal is determined.

[0010] In a possible implementation manner of the first aspect, causing a comparator to perform voltage comparison processing on a square wave signal to obtain a processed signal includes:

[0011] The square wave signal is compared with the reference voltage through a comparator. If the voltage of the square wave signal is less than the reference voltage, a low level signal is output;

[0012] If it is greater than or equal to the reference voltage, a high level signal is output.

[0013] In a possible implementation of the first aspect, using a microcontroller unit to provide a short-time pulse input to an excitation circuit so that the excitation circuit generates a square wave signal includes:

[0014] The microcontrol unit is used to provide a starting frequency, so that the microcontrol unit provides a short-time pulse input to the excitation circuit according to the starting frequency, and the excitation circuit generates a square wave signal according to the short-time pulse input.

[0015] In a possible implementation manner of the first aspect, exciting the ultrasonic transducer according to the resonant frequency excitation signal includes:

[0016] The microcontrol unit provides a long-duration pulse input to the excitation circuit according to the starting frequency corresponding to the resonant frequency excitation signal, wherein the long-duration pulse input is a pulse input less than or equal to a preset time.

[0017] A second aspect of an embodiment of the present invention provides a device for identifying a resonant frequency of an ultrasonic transducer excitation circuit, comprising:

[0018] A control module, used for providing a short-time pulse input to the excitation circuit by using a microcontroller unit, so that the excitation circuit generates a square wave signal;

[0019] A comparison module, used for inputting the square wave signal into the comparator, so that the comparator performs voltage comparison processing on the square wave signal to obtain a processed signal, wherein the processed signal is a high level signal or a low level signal;

[0020] The filtering module is used to perform low-pass filtering on the processed signal to obtain the amplitude of the processed signal. If the amplitude is greater than the preset amplitude, the signal corresponding to the amplitude is determined to be a resonant frequency excitation signal, and the ultrasonic transducer is excited according to the resonant frequency excitation signal. If the amplitude is less than the preset amplitude, the starting frequency of the microcontroller unit is updated so that the microcontroller unit continues to provide short-time pulse input to the excitation circuit according to the updated starting frequency until the resonant frequency excitation signal is determined.

[0021] In a possible implementation manner of the second aspect, the comparison module includes a comparison unit.

[0022] The comparison unit is used to compare the square wave signal with the reference voltage through a comparator. If the voltage of the square wave signal is less than the reference voltage, a low level signal is output; if it is greater than or equal to the reference voltage, a high level signal is output.

[0023] In a possible implementation manner of the second aspect, the control module includes a signal generating unit.

[0024] The signal generating unit is used to provide a starting frequency using the microcontroller unit, so that the microcontroller unit provides a short-time pulse input to the excitation circuit according to the starting frequency, and the excitation circuit generates a square wave signal according to the short-time pulse input.

[0025] In a possible implementation manner of the second aspect, the waveform of the square wave signal is an underdamped waveform, a critically damped waveform, or an overdamped waveform.

[0026] A third aspect of an embodiment of the present invention provides an ultrasonic transducer excitation circuit resonant frequency identification device, a micro control unit, an ultrasonic transducer excitation circuit resonant frequency identification device and an ultrasonic transducer, wherein the ultrasonic transducer excitation circuit resonant frequency identification device is used to perform the ultrasonic transducer excitation circuit resonant frequency identification method according to any one of claims 1 to 4;

[0027] The micro control unit is connected to the resonant frequency identification device of the ultrasonic transducer excitation circuit, and the resonant frequency identification device of the ultrasonic transducer excitation circuit is connected to the ultrasonic transducer.

[0028] In a possible implementation of the third aspect, the micro control unit is used to provide a short-time pulse input or a long-time pulse input to the excitation circuit according to the starting frequency;

[0029] The ultrasonic transducer excitation circuit resonant frequency identification device is used to use a micro control unit to provide a short-time pulse input to the excitation circuit so that the excitation circuit generates a square wave signal; input the square wave signal into a comparator so that the comparator performs voltage comparison processing on the square wave signal to obtain a processed signal, wherein the processed signal is a high-level signal or a low-level signal; low-pass filter the processed signal to obtain the amplitude of the processed signal, if the amplitude is greater than a preset amplitude, determine that the signal corresponding to the amplitude is a resonant frequency excitation signal, excite the ultrasonic transducer according to the resonant frequency excitation signal, if the amplitude is less than the preset amplitude, update the starting frequency of the micro control unit, so that the micro control unit continues to provide short-time pulse input to the excitation circuit according to the updated starting frequency until the resonant frequency excitation signal is determined;

[0030] The ultrasonic transducer is used to receive the resonant frequency excitation signal and operate according to the resonant frequency excitation signal. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 A schematic flow chart of a resonant frequency identification method for an embodiment of a resonant frequency identification method for an ultrasonic transducer excitation circuit provided by the present invention;

[0032] Figure 2A schematic diagram of an excitation circuit diagram of an embodiment of a method for identifying the resonant frequency of an ultrasonic transducer excitation circuit provided by the present invention;

[0033] Figure 3 A schematic diagram of an underdamped waveform of an embodiment of a method for identifying the resonant frequency of an ultrasonic transducer excitation circuit provided by the present invention;

[0034] Figure 4 A schematic diagram of an over-damped waveform of an embodiment of a method for identifying the resonant frequency of an ultrasonic transducer excitation circuit provided by the present invention;

[0035] Figure 5 A schematic diagram of an underdamped waveform after passing through a comparator in one embodiment of a method for identifying the resonant frequency of an ultrasonic transducer excitation circuit provided by the present invention;

[0036] Figure 6 A waveform diagram of an over-damped waveform after passing through a comparator in one embodiment of a method for identifying the resonant frequency of an ultrasonic transducer excitation circuit provided by the present invention;

[0037] Figure 7 A schematic diagram of a comparator circuit of an embodiment of a method for identifying the resonant frequency of an ultrasonic transducer excitation circuit provided by the present invention;

[0038] Figure 8 A schematic diagram of a filter circuit for an embodiment of a method for identifying the resonant frequency of an ultrasonic transducer excitation circuit provided by the present invention;

[0039] Fig. 9 A schematic diagram of a flow chart of an identification method for an embodiment of a method for identifying a resonant frequency of an ultrasonic transducer excitation circuit provided by the present invention;

[0040] Fig.10 A device block diagram of another embodiment of the method for identifying the resonant frequency of an ultrasonic transducer excitation circuit provided by the present invention;

[0041] Fig.11 A system block diagram of another embodiment of the method for identifying the resonant frequency of an ultrasonic transducer excitation circuit provided by the present invention. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] Please refer to Figure 1, which is a flow chart of an embodiment of a method for identifying the resonant frequency of an ultrasonic transducer excitation circuit provided by an embodiment of the present invention, including steps S101 to S103, each of which is specifically as follows:

[0044] S101, using a microcontroller unit to provide a short-time pulse input to an excitation circuit, so that the excitation circuit generates a square wave signal.

[0045] In this embodiment, based on the analysis of the equivalent circuit of the ultrasonic transducer, at the resonance point, since the capacitive reactance and the inductive reactance are equal in magnitude and opposite in phase, the entire transducer presents a pure resistance state. Then, when the excitation waveform is loaded on the pure resistance network, its voltage amplitude is closest to the original waveform. If the resonant frequency is offset, when the inductive reactance is greater than the capacitive reactance, the excitation waveform will oscillate, and when the capacitive reactance is greater than the inductive reactance, the excitation waveform will rise slowly. Based on these characteristics, the waveform curve can be identified, and then the resonant frequency can be determined.

[0046] like Figure 2 As shown in the excitation circuit diagram, the MCU (microcontroller unit) generates a square wave DRIVE_PRE with an amplitude of VCC_DRIVE and a duty cycle of 50% by controlling the dual MOS tubes in the excitation circuit. Through the resonant boost of L10 and C49, C50, it becomes a 500Vpp high-voltage sine wave DRIVE_N to excite the ultrasonic transducer.

[0047] In some embodiments, the step S101 of "using the microcontroller unit to provide a short-time pulse input to the excitation circuit so that the excitation circuit generates a square wave signal" includes but is not limited to the following steps:

[0048] The microcontrol unit is used to provide a starting frequency, so that the microcontrol unit provides a short-time pulse input to the excitation circuit according to the starting frequency, and the excitation circuit generates a square wave signal according to the short-time pulse input.

[0049] In this embodiment, the MCU (micro control unit) provides a starting frequency and starts a short pulse input, thereby controlling the excitation circuit to generate a square wave DRIVE_PRE with an amplitude of VCC_DRIVE.

[0050] S102, inputting the square wave signal into the comparator, so that the comparator performs voltage comparison processing on the square wave signal to obtain a processed signal, wherein the processed signal is a high level signal or a low level signal.

[0051] In this embodiment, during the process of exciting the ultrasonic transducer, the square wave DRIVE_PRE signal will not have a perfect square wave waveform due to the frequency-impedance characteristics of the transducer. When the excitation frequency is less than the resonant frequency, the transducer exhibits a capacitive characteristic, so the entire circuit is connected to L10, C49, and C50, and the entire circuit is capacitive. Therefore, the square wave DRIVE_PRE signal exhibits an under-damped waveform at the abrupt change, such as Figure 3 When the excitation frequency is greater than the resonant frequency, the transducer exhibits an inductive characteristic. Therefore, when the whole is connected with L10, C49, and C50, the entire circuit is inductive. Therefore, the square wave DRIVE_PRE signal presents an over-damped waveform at the abrupt change, as shown in Figure 4 Therefore, the square wave DRIVE_PRE is processed by the comparator circuit. Since VCC_COM selects the VCC_DRIVE level as the comparison voltage, the voltage waveforms in overdamped and underdamped conditions will change after passing through the comparator, as shown in Figure 5 and Figure 6 As shown, Figure 5 is the waveform of the underdamped waveform after passing through the comparator, Figure 6 This is the waveform of the overdamped waveform after passing through the comparator.

[0052] In some embodiments, the step S102 of “causing the comparator to perform voltage comparison processing on the square wave signal to obtain a processed signal” includes but is not limited to the following steps:

[0053] The square wave signal is compared with the reference voltage through a comparator. If the voltage of the square wave signal is less than the reference voltage, a low level signal is output;

[0054] If it is greater than or equal to the reference voltage, a high level signal is output.

[0055] In this embodiment, the comparator circuit diagram is as follows: Figure 7 As shown, the comparator uses a reference voltage for comparison. If the voltage of the square wave DRIVE_PRE signal is lower than the reference voltage, a low level is output. If it is higher than or equal to the reference voltage, a high level is output. If the square wave DRIVE_PRE signal is distorted, the distorted part is lower than the reference voltage, and a low level is output.

[0056] S103. Perform low-pass filtering on the processed signal to obtain the amplitude of the processed signal. If the amplitude is greater than the preset amplitude, determine that the signal corresponding to the amplitude is the resonant frequency excitation signal, and excite the ultrasonic transducer according to the resonant frequency excitation signal. If the amplitude is less than the preset amplitude, update the starting frequency of the microcontroller unit so that the microcontroller unit continues to provide short-time pulse input to the excitation circuit according to the updated starting frequency until the resonant frequency excitation signal is determined.

[0057] In this embodiment, after being processed by the comparator, the processed signal either has a smaller pulse width or is sawtooth-shaped, and has a deviation from the ideal excitation signal similarity. The greater the deviation, the lower the amplitude value of the signal after filtering. The lower the amplitude, the farther it deviates from the resonant frequency. Therefore, low-pass filtering is required. The amplitude of the filtered DC signal will change. At the resonant frequency, since the load and the excitation circuit are combined into a pure resistance network, it is in a critical damping state, and the excitation waveform will be an ideal waveform. Its filtered DC amplitude is higher, while in the under-damped and over-damped states, its DC amplitude will be smaller than the amplitude in the critical damping state.

[0058] Filter circuit such as Figure 8 As shown, the signal processed and output by the comparator is directly filtered through the analog filter U15. After filtering, the amplitude values ​​of signals with different pulse widths are different. Therefore, it can be judged according to the amplitude value. If the amplitude value is higher, it means that the pulse width is closer to the excitation signal and the similarity is higher. The higher the similarity, the less signal distortion, which means that the excitation frequency is close to the resonant frequency of the transducer.

[0059] If the amplitude is less than the preset amplitude, the starting frequency of the micro control unit is updated, so that the micro control unit continues to provide short-time pulse input to the excitation circuit according to the updated starting frequency until the resonant frequency excitation signal is determined.

[0060] In some embodiments, step S103 of "stimulating the ultrasonic transducer according to the resonant frequency excitation signal" includes but is not limited to the following steps:

[0061] The microcontrol unit is enabled to provide a long-duration pulse input to the excitation circuit according to the starting frequency corresponding to the resonant frequency excitation signal, wherein the long-duration pulse input is a pulse input less than or equal to a preset time.

[0062] In this embodiment, the identification method is as follows: Fig. 9 As shown, the MCU only needs to read the amplitude data after filtering, and then selects the signal with the highest DC amplitude, which is the excitation signal closest to the resonant frequency, and then excites the ultrasonic transducer for a long time according to the resonant frequency excitation signal. It can be understood that the microcontroller provides a long-term pulse input to the excitation circuit according to the starting frequency corresponding to the resonant frequency excitation signal, and the long-term pulse input is a pulse input less than or equal to the preset time.

[0063] It should be noted that the preset time can be determined according to actual needs.

[0064] It should be understood that although Figure 1The steps in the flowchart are shown in sequence as indicated by the arrows, but these steps are not necessarily executed in the order indicated by the arrows. Unless otherwise specified in this document, there is no strict order restriction for the execution of these steps, and these steps can be executed in other orders. Moreover, Figure 1 At least part of the steps may include multiple steps or multiple stages. These steps or stages are not necessarily performed at the same time, but can be performed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed in turn or alternately with other steps or at least part of the steps or stages in other steps.

[0065] In some embodiments, Fig.10 As shown, it shows a block diagram of an ultrasonic transducer excitation circuit resonant frequency identification device 1000 provided in an embodiment of the present application, including:

[0066] The control module 1001 is used to provide a short-time pulse input to the excitation circuit by using a microcontroller unit, so that the excitation circuit generates a square wave signal;

[0067] The comparison module 1002 is used to input the square wave signal into the comparator so that the comparator performs voltage comparison processing on the square wave signal to obtain a processed signal, wherein the processed signal is a high level signal or a low level signal;

[0068] The filtering module 1003 is used to perform low-pass filtering on the processed signal to obtain the amplitude of the processed signal. If the amplitude is greater than the preset amplitude, the signal corresponding to the amplitude is determined to be a resonant frequency excitation signal, and the ultrasonic transducer is excited according to the resonant frequency excitation signal. If the amplitude is less than the preset amplitude, the starting frequency of the microcontroller unit is updated so that the microcontroller unit continues to provide short-time pulse input to the excitation circuit according to the updated starting frequency until the resonant frequency excitation signal is determined.

[0069] In some embodiments, the comparison module 1002 includes a comparison unit,

[0070] The comparison unit is used to compare the square wave signal with the reference voltage through a comparator. If the voltage of the square wave signal is less than the reference voltage, a low level signal is output; if it is greater than the reference voltage, a high level signal is output.

[0071] In some embodiments, the control module 1001 includes a signal generating unit,

[0072] The signal generating unit is used to provide a starting frequency using the microcontroller unit, so that the microcontroller unit provides a short-time pulse input to the excitation circuit according to the starting frequency, and the excitation circuit generates a square wave signal according to the short-time pulse input.

[0073] In some embodiments, exciting the ultrasonic transducer according to the resonant frequency excitation signal includes:

[0074] The microcontrol unit provides a long-duration pulse input to the excitation circuit according to the starting frequency corresponding to the resonant frequency excitation signal, wherein the long-duration pulse input is a pulse input less than or equal to a preset time.

[0075] In some embodiments, Fig.11 As shown, it shows a block diagram of an ultrasonic transducer excitation circuit resonant frequency identification system 1100 provided in an embodiment of the present application, including a micro control unit, an ultrasonic transducer excitation circuit resonant frequency identification device and an ultrasonic transducer, wherein:

[0076] The ultrasonic transducer excitation circuit resonant frequency identification device is used to execute the above ultrasonic transducer excitation circuit resonant frequency identification method;

[0077] The micro control unit is connected to the resonant frequency identification device of the ultrasonic transducer excitation circuit, and the resonant frequency identification device of the ultrasonic transducer excitation circuit is connected to the ultrasonic transducer.

[0078] In some embodiments, the microcontroller unit is used to provide a short-duration pulse input or a long-duration pulse input to the excitation circuit according to the starting frequency;

[0079] The ultrasonic transducer excitation circuit resonant frequency identification device is used to use a micro control unit to provide a short-time pulse input to the excitation circuit so that the excitation circuit generates a square wave signal; input the square wave signal into a comparator so that the comparator performs voltage comparison processing on the square wave signal to obtain a processed signal, wherein the processed signal is a high-level signal or a low-level signal; low-pass filter the processed signal to obtain the amplitude of the processed signal, if the amplitude is greater than a preset amplitude, determine that the signal corresponding to the amplitude is a resonant frequency excitation signal, excite the ultrasonic transducer according to the resonant frequency excitation signal, if the amplitude is less than the preset amplitude, update the starting frequency of the micro control unit, so that the micro control unit continues to provide short-time pulse input to the excitation circuit according to the updated starting frequency until the resonant frequency excitation signal is determined;

[0080] The ultrasonic transducer is used to receive the resonant frequency excitation signal and operate according to the resonant frequency excitation signal.

[0081] Compared with the prior art, the present invention has the following beneficial effects:

[0082] The present invention discloses a method, device and system for identifying the resonant frequency of an ultrasonic transducer excitation circuit. The method uses a microcontroller unit to provide a short-time pulse input to the excitation circuit so that the excitation circuit generates a square wave signal; the square wave signal is input into a comparator so that the comparator performs voltage comparison processing on the square wave signal to obtain a processed signal; the processed signal is low-pass filtered to obtain the amplitude of the processed signal. If the amplitude is greater than a preset amplitude, the signal corresponding to the amplitude is determined to be a resonant frequency excitation signal, and the ultrasonic transducer is excited according to the resonant frequency excitation signal. If the amplitude is less than the preset amplitude, the starting frequency of the microcontroller unit is updated so that the microcontroller unit continues to provide a short-time pulse input to the excitation circuit according to the updated starting frequency until the resonant frequency excitation signal is determined. Through the above method, according to the waveform of the excitation voltage, the present invention distinguishes the waveform through a comparator and an operational amplifier, and then picks up the resonant frequency according to the waveform, thereby improving the accuracy of resonant frequency judgment.

[0083] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0084] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. It is particularly pointed out that for those skilled in the art, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for identifying the resonant frequency of an ultrasonic transducer excitation circuit, characterized in that: include: Using a microcontroller unit to provide a short-time pulse input to an excitation circuit so that the excitation circuit generates a square wave signal, wherein the short-time pulse input is a pulse input shorter than a preset time; Inputting the square wave signal into a comparator so that the comparator performs voltage comparison processing on the square wave signal to obtain a processed signal, wherein the processed signal is a high level signal or a low level signal; Perform a low-pass filter on the processed signal to obtain the amplitude of the processed signal. If the amplitude is greater than a preset amplitude, determine that the signal corresponding to the amplitude is a resonant frequency excitation signal, and excite the ultrasonic transducer according to the resonant frequency excitation signal. If the amplitude is less than the preset amplitude, update the starting frequency of the microcontroller unit so that the microcontroller unit continues to provide short-time pulse input to the excitation circuit according to the updated starting frequency until the resonant frequency excitation signal is determined.

2. The method for identifying the resonant frequency of an ultrasonic transducer excitation circuit according to claim 1, characterized in that: The step of causing the comparator to perform voltage comparison processing on the square wave signal to obtain a processed signal includes: Comparing the square wave signal with a reference voltage through a comparator, and outputting a low level signal if the voltage of the square wave signal is less than the reference voltage; If it is greater than the reference voltage, a high level signal is output.

3. The method for identifying the resonant frequency of an ultrasonic transducer excitation circuit according to claim 1, characterized in that: The method of using a microcontroller unit to provide a short-time pulse input to an excitation circuit so that the excitation circuit generates a square wave signal comprises: The microcontrol unit is used to provide a starting frequency, so that the microcontrol unit provides a short-time pulse input to the excitation circuit according to the starting frequency, so that the excitation circuit generates a square wave signal according to the short-time pulse input.

4. The method for identifying the resonant frequency of an ultrasonic transducer excitation circuit according to claim 1, characterized in that: The exciting the ultrasonic transducer according to the resonant frequency excitation signal comprises: The microcontrol unit is enabled to provide a long-duration pulse input to the excitation circuit according to the starting frequency corresponding to the resonant frequency excitation signal, wherein the long-duration pulse input is a pulse input less than or equal to a preset time.

5. A device for identifying the resonant frequency of an ultrasonic transducer excitation circuit, characterized in that: include: A control module, used for providing a short-time pulse input to the excitation circuit by using a microcontroller unit, so that the excitation circuit generates a square wave signal; A comparison module, used for inputting the square wave signal into a comparator, so that the comparator performs voltage comparison processing on the square wave signal to obtain a processed signal, wherein the processed signal is a high level signal or a low level signal; The filtering module is used to perform low-pass filtering on the processed signal to obtain the amplitude of the processed signal. If the amplitude is greater than a preset amplitude, the signal corresponding to the amplitude is determined to be a resonant frequency excitation signal, and the ultrasonic transducer is excited according to the resonant frequency excitation signal. If the amplitude is less than the preset amplitude, the starting frequency of the microcontroller unit is updated so that the microcontroller unit continues to provide short-time pulse input to the excitation circuit according to the updated starting frequency until the resonant frequency excitation signal is determined.

6. The ultrasonic transducer excitation circuit resonant frequency identification device according to claim 5, characterized in that: The comparison module includes a comparison unit, The comparison unit is used to compare the square wave signal with a reference voltage through a comparator, and output a low level signal if the voltage of the square wave signal is less than the reference voltage; and output a high level signal if the voltage of the square wave signal is greater than the reference voltage.

7. The ultrasonic transducer excitation circuit resonant frequency identification device according to claim 5, characterized in that: The control module includes a signal generating unit, The signal generating unit is used to provide a starting frequency using a microcontroller unit, so that the microcontroller unit provides a short-time pulse input to the excitation circuit according to the starting frequency, and the excitation circuit generates a square wave signal according to the short-time pulse input.

8. The ultrasonic transducer excitation circuit resonant frequency identification device according to claim 5, characterized in that: The exciting the ultrasonic transducer according to the resonant frequency excitation signal comprises: The micro control unit is enabled to provide a long-duration pulse input to the excitation circuit according to the starting frequency corresponding to the resonant frequency excitation signal, wherein the long-duration pulse input is a pulse input less than or equal to a preset time.

9. An ultrasonic transducer excitation circuit resonant frequency identification system, comprising a micro control unit, an ultrasonic transducer excitation circuit resonant frequency identification device and an ultrasonic transducer, wherein: The ultrasonic transducer excitation circuit resonant frequency identification device is used to perform the ultrasonic transducer excitation circuit resonant frequency identification method according to any one of claims 1 to 4; The micro control unit is connected to the ultrasonic transducer excitation circuit resonant frequency identification device, and the ultrasonic transducer excitation circuit resonant frequency identification device is connected to the ultrasonic transducer.

10. The ultrasonic transducer excitation circuit resonant frequency identification system according to any one of claims 9, characterized in that: The micro control unit is used to provide a short-time pulse input or a long-time pulse input to the excitation circuit according to the starting frequency; The ultrasonic transducer excitation circuit resonant frequency identification device is used to use a micro control unit to provide a short-time pulse input to the excitation circuit so that the excitation circuit generates a square wave signal; input the square wave signal into a comparator so that the comparator performs voltage comparison processing on the square wave signal to obtain a processed signal, wherein the processed signal is a high-level signal or a low-level signal; low-pass filter the processed signal to obtain the amplitude of the processed signal, if the amplitude is greater than a preset amplitude, determine that the signal corresponding to the amplitude is a resonant frequency excitation signal, and excite the ultrasonic transducer according to the resonant frequency excitation signal, if the amplitude is less than the preset amplitude, update the starting frequency of the micro control unit, so that the micro control unit continues to provide short-time pulse input to the excitation circuit according to the updated starting frequency until the resonant frequency excitation signal is determined; The ultrasonic transducer is used to receive a resonant frequency excitation signal and operate according to the resonant frequency excitation signal.

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