A method and apparatus for dynamic impedance matching of ultrasonic transducers

Abstract

This invention provides a method and apparatus for dynamic impedance matching of an ultrasonic transducer, relating to the field of ultrasonic transducer technology. The method includes: acquiring a voltage-current phase difference signal; adjusting the output voltage frequency of a power supply to make the phase difference between voltage and current zero based on the voltage-current phase difference signal, and determining whether the power supply regulation has failed; if the power supply regulation has failed, adjusting the capacitance and inductance values ​​of the dynamic matching circuit to make the phase difference between voltage and current zero and the quality factor of the dynamic matching circuit within a preset range. When the power supply regulation fails, by adjusting the capacitance and inductance values ​​of the dynamic matching circuit, the phase difference between voltage and current is made zero to achieve resonance, while the quality factor of the dynamic matching circuit is kept within a preset range to improve energy conversion efficiency, thereby providing sufficient energy for the ultrasonic transducer to cope with drastically changing operating conditions. Even when replacing ultrasonic transducers with different parameters and models, high-power operation at the resonant frequency can be ensured.

Description

Technical Field

[0001] This invention relates to the field of ultrasonic transducer technology, and in particular to an impedance dynamic matching method and apparatus for ultrasonic transducers. Background Technology

[0002] Ultrasonic transducers have a wide range of applications. They need to operate in a resonant state, meaning the power supply provides voltage to the transducer, and the phase difference between the voltage and current across the transducer is zero. During operation, the resonant frequency of the ultrasonic transducer changes with the external operating conditions. A phase-locked loop (PLL) method is typically used to maintain the transducer's resonant state. This is achieved by detecting the phase difference between the current and voltage across the transducer and adjusting the power supply output frequency accordingly to ensure the transducer's resonance.

[0003] In the existing technology, when the operating conditions of the ultrasonic transducer change drastically or when the ultrasonic transducer is replaced with one of different parameters and model, a phase lock-in phenomenon occurs. That is, adjusting the output frequency of the power supply cannot make the ultrasonic transducer resonate, the phase lock-in method fails, resulting in the power supply outputting more reactive power, low system energy conversion efficiency, and reduced output amplitude of the ultrasonic transducer, which greatly affects the processing quality. Summary of the Invention

[0004] This invention provides a dynamic impedance matching method and apparatus for ultrasonic transducers, which solves the defects in the prior art where ultrasonic transducers cannot achieve the resonant frequency and have low energy conversion efficiency due to drastic changes in operating conditions or replacement with ultrasonic transducers of different parameters and models.

[0005] This invention provides a method for dynamic impedance matching of an ultrasonic transducer, comprising:

[0006] Obtain the voltage and current phase difference signal;

[0007] Based on the voltage-current phase difference signal, adjust the output voltage frequency of the power supply to make the phase difference between voltage and current zero, and determine whether the power supply regulation has failed.

[0008] If the power supply regulation fails, adjust the capacitance and inductance values ​​of the dynamic matching circuit to make the phase difference between voltage and current zero and the quality factor of the dynamic matching circuit within a preset range.

[0009] According to the present invention, an impedance dynamic matching method for an ultrasonic transducer, wherein if power supply regulation fails, adjusting the capacitance and inductance values ​​of the dynamic matching circuit to make the phase difference between voltage and current zero and the quality factor of the dynamic matching circuit within a preset range includes:

[0010] When power regulation fails, the output voltage frequency corresponding to the maximum current when the output voltage frequency of the power supply is adjusted is obtained as the first resonant frequency.

[0011] A first equation is constructed based on the relationship between the first resonant frequency and the capacitance and inductance values, and a second equation is constructed based on the relationship between the quality factor and the capacitance and inductance values.

[0012] Solve the first equation and the second equation simultaneously to obtain the first target capacitance value and the first target inductance value;

[0013] The dynamic matching circuit is adjusted based on the first target capacitance value and the first target inductance value.

[0014] According to the present invention, an impedance dynamic matching method for an ultrasonic transducer, wherein adjusting the output voltage frequency of the power supply to make the phase difference between the voltage and current zero based on the voltage-current phase difference signal, and determining whether the power supply adjustment has failed, includes:

[0015] Adjust the output voltage frequency of the power supply, synchronously acquire the voltage and current phase difference signal, and determine whether the phase difference between voltage and current is zero;

[0016] If it is zero, then the corresponding output voltage frequency will be used as the operating frequency;

[0017] If it is not zero, continue to adjust the output voltage frequency until it traverses the voltage frequency range of the power supply;

[0018] If the voltage frequency range of the power supply is traversed and the operating frequency does not exist, then the power supply regulation is determined to be faulty.

[0019] According to the impedance dynamic matching method for an ultrasonic transducer provided by the present invention, after the step of taking the corresponding output voltage frequency as the operating frequency if the voltage is zero, the method further includes:

[0020] Using the operating frequency as the second resonant frequency, a third equation is constructed regarding the second resonant frequency, capacitance value, and inductance value; and a fourth equation is constructed regarding the quality factor, capacitance value, and inductance value.

[0021] Solve the third equation and the fourth equation simultaneously to obtain the second target capacitance value and the second target inductance value;

[0022] The dynamic matching circuit is adjusted based on the second target capacitance value and a majority of the second target inductance values.

[0023] According to the present invention, an impedance dynamic matching method for an ultrasonic transducer includes, wherein acquiring the voltage-current phase difference signal comprises:

[0024] Acquire transducer voltage detection signal and transducer current detection signal;

[0025] Based on the transducer voltage detection signal and the transducer current detection signal, the phase difference between voltage and current is calculated, and the voltage-current phase difference signal is generated.

[0026] The present invention also provides an ultrasonic transducer device, including a transducer body, a power supply module, a control module, a phase detection circuit, and a dynamic matching circuit. The power supply module is electrically connected to the transducer body through the dynamic matching circuit. The control module is connected to the controlled terminal of the dynamic matching circuit and the controlled terminal of the power supply module. The control module is electrically connected to the transducer body through the phase detection circuit. The control module is capable of executing the above-described impedance dynamic matching method for an ultrasonic transducer.

[0027] According to the ultrasonic transducer device provided by the present invention, the dynamic matching circuit includes a variable capacitor unit, a variable inductor unit, and an adjustment unit. The variable capacitor unit is connected in series with the variable inductor unit, and the two ends of the variable capacitor unit are electrically connected to the transducer body. The adjustment unit is connected to the variable capacitor unit and the variable inductor unit, and the control module is electrically connected to the adjustment unit.

[0028] According to the ultrasonic transducer device provided by the present invention, the phase detection circuit includes a voltage detection unit and a current detection unit. The voltage detection unit and the current detection unit are both electrically connected to the transducer body or to the output terminal of the dynamic matching circuit. The control module is electrically connected to the voltage detection unit and the current detection unit respectively.

[0029] The ultrasonic transducer device provided by the present invention further includes an isolation circuit, wherein the control module is electrically connected to the controlled terminal of the dynamic matching circuit, the controlled terminal of the power supply module, and the phase detection circuit through the isolation circuit.

[0030] The ultrasonic transducer device provided by the present invention further includes a communication module, wherein the control module is electrically connected to the communication module, and the communication module is used for communication connection with a host computer.

[0031] The present invention provides an impedance dynamic matching method and apparatus for an ultrasonic transducer, which has at least the following beneficial effects: By adjusting the output voltage frequency of the power supply, the phase difference between the voltage and current is made zero, i.e., resonance occurs. When adjusting the voltage frequency of the power supply fails to achieve resonance, i.e., the power supply regulation fails, the capacitance and inductance values ​​of the dynamic matching circuit are adjusted to make the phase difference between the voltage and current zero, achieving resonance. At the same time, the capacitance and inductance values ​​of the dynamic matching circuit ensure that the quality factor of the dynamic matching circuit is within a preset range, giving the dynamic matching circuit a high quality factor to improve energy conversion efficiency. This allows the ultrasonic transducer to provide sufficient energy to cope with drastically changing operating conditions, and ensures high-power operation at the resonant frequency even when replacing ultrasonic transducers with different parameters and models. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in this invention 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 some embodiments of this invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0033] Figure 1 This is one of the flowcharts illustrating a dynamic impedance matching method for an ultrasonic transducer provided by the present invention;

[0034] Figure 2 This is the second schematic flowchart of an impedance dynamic matching method for an ultrasonic transducer provided by the present invention;

[0035] Figure 3 This is the third flowchart illustrating the impedance dynamic matching method for an ultrasonic transducer provided by the present invention;

[0036] Figure 4 This is the fourth flowchart illustrating the impedance dynamic matching method for an ultrasonic transducer provided by the present invention;

[0037] Figure 5 This is the fifth flowchart illustrating the impedance dynamic matching method for an ultrasonic transducer provided by the present invention;

[0038] Figure 6 This is a circuit diagram of one embodiment of the ultrasonic transducer device provided by the present invention;

[0039] Figure 7 This is a schematic diagram of one embodiment of the ultrasonic transducer device provided by the present invention;

[0040] Figure 8 This is a schematic diagram showing the changes in the operating point of an ultrasonic transducer. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0042] For phase-locked loop (PLL) failures, static matching methods exist. These methods use a matching circuit with fixed parameters. When the resonant frequency of the ultrasonic transducer changes due to variations in operating conditions or the replacement with a different model or parameter, the power supply adjusts the output voltage frequency accordingly. Figure 8 As shown, when the power supply output voltage frequency changes from f1 to f2, the resonant circuit output in the static matching circuit changes from P0 to P1. While the frequency of the static matching circuit output voltage can meet the transducer's resonance requirements, the energy output to the transducer is significantly reduced, making it difficult for the transducer to function properly. In cases of drastic changes in operating conditions, leading to substantial changes in the resonant frequency, the static matching method may not find a resonant frequency point and cannot adapt to situations involving drastic changes in operating conditions or the replacement of ultrasonic transducers with significantly different parameters.

[0043] To address the issues of failing to achieve the resonant frequency and low energy conversion efficiency in ultrasonic transducers due to drastic changes in operating conditions or replacement with ultrasonic transducers of different parameters and models, the following section combines... Figures 1-5 The present invention describes an impedance dynamic matching method for an ultrasonic transducer, comprising:

[0044] S100: Acquire voltage and current phase difference signals;

[0045] S200: Based on the voltage-current phase difference signal, adjust the output voltage frequency of the power supply to make the phase difference between voltage and current zero, and determine whether the power supply regulation has failed.

[0046] S300: If the power supply regulation fails, adjust the capacitance and inductance values ​​of the dynamic matching circuit to make the phase difference between voltage and current zero and the quality factor of the dynamic matching circuit within a preset range.

[0047] By adjusting the output voltage frequency of the power supply, the phase difference between the voltage and current can be reduced to zero, thus achieving resonance. When adjusting the voltage frequency of the power supply fails to achieve resonance (i.e., the power supply regulation fails), the phase difference between the voltage and current can be reduced to zero by adjusting the capacitance and inductance values ​​of the dynamic matching circuit, achieving resonance. Simultaneously, the capacitance and inductance values ​​of the dynamic matching circuit ensure that its quality factor remains within a preset range. A high quality factor in the dynamic matching circuit improves energy conversion efficiency, thereby providing sufficient energy for the ultrasonic transducer to cope with drastically changing operating conditions. Even when replacing ultrasonic transducers with different parameters and models, high-power operation at the resonant frequency can still be ensured.

[0048] The dynamic matching circuit includes a variable capacitor unit, a variable inductor unit, and an adjustment unit. (Reference) Figure 6 The variable capacitor unit can be implemented by including multiple capacitors. The adjustment unit includes multiple relays connected to corresponding capacitors. When the relays are closed, the corresponding capacitors can be connected in parallel. By controlling the closing and opening of the relays, the number of capacitors connected in parallel can be controlled, thereby achieving the effect of adjusting the capacitance value. (Reference) Figure 6 The variable inductor unit can be implemented by including multiple inductors connected in series. The adjustment unit includes multiple relays connected in parallel with the corresponding inductors. When the relay is closed, the corresponding inductor is short-circuited, that is, the corresponding inductor is removed from the series circuit. By controlling the closing and opening of the relay, the number of series inductors can be controlled, thereby achieving the effect of adjusting the inductance value.

[0049] The quality factor represents the ratio of reactive power to active power, that is, the ratio of stored energy to consumed energy. The larger the quality factor of the dynamic matching circuit, the smaller the proportion of active power consumed by the dynamic matching circuit. This is beneficial for transmitting the power supply's electrical energy to the ultrasonic transducer with lower loss, thereby improving energy conversion efficiency and providing sufficient energy to the ultrasonic transducer.

[0050] refer to Figure 2 In some embodiments of the impedance dynamic matching method for an ultrasonic transducer of the present invention, step S300 includes:

[0051] S310: When power regulation fails, the output voltage frequency corresponding to the maximum current when the output voltage frequency of the power supply is adjusted is obtained as the first resonant frequency.

[0052] S320: Construct a first equation based on the relationship between the first resonant frequency and the capacitance and inductance values, and construct a second equation based on the relationship between the quality factor and the capacitance and inductance values;

[0053] S330: Solve the first equation and the second equation simultaneously to obtain the first target capacitance value and the first target inductance value;

[0054] S340: Adjust the dynamic matching circuit according to the first target capacitance value and the first target inductance value.

[0055] Since the output voltage frequency of the power supply is closest to the resonant state when the maximum current is obtained during the adjustment process, the output voltage frequency corresponding to the maximum current is used as the first resonant frequency to construct the first equation. At the same time, a second equation about the quality factor is constructed. The first and second equations are solved simultaneously to obtain the first target capacitance value and the second target inductance value. Based on the first target capacitance value and the first inductance value, the capacitance and inductance values ​​of the dynamic matching circuit are adjusted so that resonance can occur at the first resonant frequency and the quality factor is within the preset range.

[0056] It is understandable that the specific expressions of the first and second equations are related to the specific structure of the dynamic matching circuit. The expressions of the first and second equations are pre-set according to the specific structure of the dynamic matching circuit. For example, if the specific structure of the dynamic matching circuit can be equivalent to a capacitor and an inductor connected in series, the expression of the first equation could be:

[0057]

[0058] The expression for the second equation can be:

[0059]

[0060] Where A is a coefficient that can be set according to the equivalent resistance.

[0061] The above is merely an illustrative example. Depending on the specific structure of the dynamic circuit, the first and second equations can be other expressions. The quality coefficient can be greater than a preset value, or within a preset percentage deviation range of the maximum value, or simply the maximum value, etc.

[0062] refer to Figure 3 In some embodiments of the impedance dynamic matching method for an ultrasonic transducer of the present invention, step S200 includes:

[0063] S210: Adjust the output voltage frequency of the power supply, synchronously acquire the voltage and current phase difference signal, and determine whether the phase difference between voltage and current is zero;

[0064] S220: If it is zero, then the corresponding output voltage frequency is used as the operating frequency;

[0065] S230: If it is not zero, continue to adjust the output voltage frequency until it traverses the voltage frequency range of the power supply;

[0066] S240: If the voltage frequency range of the power supply is traversed and the operating frequency does not exist, it is determined that the power supply regulation has failed.

[0067] The voltage frequency range of the power supply is traversed, and the phase difference between the corresponding voltage and current is obtained synchronously. When the phase difference is zero, resonance occurs. The corresponding output voltage frequency is taken as the working frequency, and the power supply continues to output the voltage at the working frequency, so that the ultrasonic transducer can maintain the resonant state.

[0068] After traversing the voltage frequency range of the power supply, there is no output voltage frequency that makes the phase difference between voltage and current zero. This means that simply adjusting the output voltage frequency of the power supply cannot achieve resonance. Therefore, it is determined that the power supply regulation has failed and resonance needs to be achieved by adjusting the dynamic matching circuit.

[0069] It is understandable that, during the process of traversing the voltage frequency range of the power supply, the maximum current and the corresponding output voltage frequency are recorded so that when the power supply regulation fails, the output voltage frequency can be used as the first resonant frequency to construct the first equation.

[0070] refer to Figure 4 In some embodiments of the impedance dynamic matching method for an ultrasonic transducer of the present invention, after S220, the method further includes:

[0071] S221: Using the operating frequency as the second resonant frequency, construct a third equation regarding the second resonant frequency, capacitance value, and inductance value, and construct a fourth equation regarding the quality factor, capacitance value, and inductance value;

[0072] S222: Solve the third equation and the fourth equation simultaneously to obtain the second target capacitance value and the second target inductance value;

[0073] S223: Adjust the dynamic matching circuit according to the second target capacitance value and a majority of the second target inductance values.

[0074] After adjusting the output voltage frequency of the unit and finding the operating frequency, although resonance occurs, the quality factor may be low, resulting in low energy conversion efficiency. Figure 8As shown, under no-load conditions, the resonant frequency of the ultrasonic transducer is f1, and its operating point is P0. At this time, the output current of the dynamic matching circuit is relatively large. After the operating conditions of the ultrasonic transducer change or a transducer with different parameters and models is replaced, the resonant frequency f2 is found as the operating frequency. However, at the operating frequency f2, the corresponding operating point is P1, and the quality factor of the dynamic matching circuit is too small, resulting in a small output current of the dynamic matching circuit, and consequently, a small power of the ultrasonic transducer. Therefore, a third equation is constructed using the operating frequency f2 as the second resonant frequency, and a fourth equation is constructed regarding the quality factor. Then, the third equation and the fourth equation are solved simultaneously to obtain the second target capacitance value and the second target inductance value. Adjusting the dynamic matching circuit based on the second target capacitance and inductance values ​​improves the quality factor of the dynamic matching circuit and thus increases the energy conversion efficiency while keeping the resonant frequency f2 constant. This changes the operating point of the ultrasonic transducer from P1 to P2, resulting in a larger output current from the dynamic matching circuit. This meets the power supply requirements of the ultrasonic transducer, increases its output power, and helps adapt to drastic changes in operating conditions and the replacement of ultrasonic transducers with different parameters.

[0075] It is understandable that the first equation has the same expression as the third equation, and the second equation has the same expression as the fourth equation, thus obtaining the target capacitance and target inductance values ​​in the same way.

[0076] refer to Figure 5 In some embodiments of the impedance dynamic matching method for an ultrasonic transducer of the present invention, step S100 includes:

[0077] S110: Acquire transducer voltage detection signal and transducer current detection signal;

[0078] S120: Calculate the phase difference between voltage and current based on the transducer voltage detection signal and the transducer current detection signal, and generate the voltage-current phase difference signal.

[0079] The voltage change curve can be obtained from the voltage detection signal, and the current change curve can be obtained from the current detection signal. By comparing the two, the phase difference between voltage and current can be obtained, and a voltage-current phase difference signal can be generated.

[0080] refer to Figure 6 and Figure 7The present invention also provides an ultrasonic transducer device, including a transducer body 900, a power supply module 910, a control module 920, a phase detection circuit 930, and a dynamic matching circuit 940. The power supply module 910 is electrically connected to the transducer body 900 through the dynamic matching circuit 940. The control module 920 is connected to the controlled terminal of the dynamic matching circuit 940 and the controlled terminal of the power supply module 910. The control module 920 is electrically connected to the transducer body 900 through the phase detection circuit 930. The control module 920 is capable of executing the impedance dynamic matching method of an ultrasonic transducer as described above.

[0081] The power module 910 outputs electrical energy to the transducer body 900 through the dynamic matching circuit 940 to drive the transducer body 900 to work. When the operating conditions of the transducer body 900 change and a phase difference exists between the voltage and the current, the control module 920 obtains the voltage and current phase difference signal through the phase detection circuit 930 and adjusts the output voltage frequency of the power supply according to the voltage and current phase difference signal to make the phase difference between the voltage and the current zero, that is, to achieve resonance. When the voltage frequency of the power supply cannot resonate due to the adjustment of the control module 920, i.e., the power supply regulation fails, the control module 920 adjusts the capacitance and inductance values ​​of the dynamic matching circuit 940 to make the phase difference between the voltage and current zero, thus achieving resonance. At the same time, the capacitance and inductance values ​​of the dynamic matching circuit 940 ensure that the quality factor of the dynamic matching circuit 940 is within a preset range, giving the dynamic matching circuit 940 a high quality factor to improve energy conversion efficiency. This allows the transducer body 900 to provide sufficient energy to cope with drastically changing operating conditions. Even when replacing the transducer body 900 with different parameter models, it can still ensure high-power operation at the resonant frequency.

[0082] The power supply module 910 may be implemented by including a signal generation circuit and a frequency modulation circuit. The control module 920 may be implemented by including devices such as a microcontroller or an embedded chip. The transducer body 900 may be implemented by including devices such as piezoelectric ceramics.

[0083] refer to Figure 6 In some embodiments of the ultrasonic transducer device provided by the present invention, the dynamic matching circuit 940 includes a variable capacitor unit, a variable inductor unit, and an adjustment unit. The variable capacitor unit is connected in series with the variable inductor unit, and the two ends of the variable capacitor unit are electrically connected to the transducer body 900. The adjustment unit is connected to the variable capacitor unit and the variable inductor unit, and the control module 920 is electrically connected to the adjustment unit.

[0084] The control module 920 controls the adjustment unit to change the equivalent capacitance value of the variable capacitor unit and the equivalent inductance value of the variable inductor unit, thereby performing impedance matching with the transducer body 900 and the load, so that the phase difference between the voltage and current output to the transducer body 900 is zero, that is, resonance occurs. At the same time, by adjusting the equivalent capacitance value of the capacitor unit and the equivalent inductance value of the variable inductor unit, the quality factor can be increased without changing the resonant frequency, thereby improving the energy conversion efficiency.

[0085] refer to Figure 6 The variable capacitor unit can be implemented by including multiple capacitors. The adjustment unit includes multiple relays connected to the corresponding capacitors. When the relays are closed, the corresponding capacitors are connected in parallel. By controlling the closing and opening of the relays, the number of capacitors connected in parallel can be controlled, thereby achieving the effect of adjusting the capacitance value. Referring to the figure, the variable inductor unit can be implemented by including multiple inductors connected in series. The multiple inductors are connected in series. The adjustment unit includes multiple relays connected in parallel to the corresponding inductors. When the relays are closed, the corresponding inductors are short-circuited, i.e., the corresponding inductors are removed from the series circuit. By controlling the closing and opening of the relays, the number of inductors in series can be controlled, thereby achieving the effect of adjusting the inductance value. In some embodiments of the present invention, the relays can also be replaced by transistors with switching functions such as field-effect transistors (FETs) and IGBTs.

[0086] In some embodiments of the ultrasonic transducer device provided by the present invention, the phase detection circuit 930 includes a voltage detection unit and a current detection unit. The voltage detection unit and the current detection unit are both electrically connected to the transducer body 900 or to the output terminal of the dynamic matching circuit 940. The control module 920 is electrically connected to the voltage detection unit and the current detection unit respectively.

[0087] The voltage detection unit and the current detection unit detect voltage and current from the output terminal of the dynamic matching circuit 940 or the transducer body 900 and feed them back to the control module 920. The control module 920 compares the voltage change curve with the current change curve to obtain the phase difference between voltage and current.

[0088] In some embodiments of the present invention, the voltage detection unit may be an implementation of a circuit or device with voltage detection function, such as a voltage divider circuit or a voltage transformer. The current detection unit may be an implementation of a device or circuit with current detection function, such as a current transformer.

[0089] refer to Figure 7In some embodiments of the ultrasonic transducer device provided by the present invention, an isolation circuit 950 is also included. The control module 920 is electrically connected to the controlled terminal of the dynamic matching circuit 940, the controlled terminal of the power supply module 910, and the phase detection circuit 930 through the isolation circuit 950.

[0090] The isolation circuit 950 isolates the control module 920 from the high-voltage operating environment, making the control module 920 more stable and reliable and improving its safety. The isolation circuit 950 can be implemented using devices such as relays, triggers, and optocouplers.

[0091] refer to Figure 7 In some embodiments of the ultrasonic transducer device provided by the present invention, a communication module 960 is also included. The control module 920 is electrically connected to the communication module 960, and the communication module 960 is used for communication connection with a host computer.

[0092] The control module 920 communicates with the host computer through the communication module 960, and can upload information such as voltage, current and working status to the host computer. At the same time, it can also obtain control signals from the host computer to control the transducer body 900 and other operations according to the control signals.

[0093] The communication module 960 can be implemented using devices such as an RS232 interface module, a CAN communication module, and a wireless communication chip.

[0094] In the description of this invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0095] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0096] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for dynamic impedance matching of an ultrasonic transducer, characterized in that, include: Obtain the voltage and current phase difference signal; Based on the voltage-current phase difference signal, adjust the output voltage frequency of the power supply to make the phase difference between voltage and current zero, and determine whether the power supply regulation has failed. If the power supply regulation fails, adjust the capacitance and inductance values ​​of the dynamic matching circuit to make the phase difference between voltage and current zero and the quality factor of the dynamic matching circuit within a preset range. If power regulation fails, adjusting the capacitance and inductance values ​​of the dynamic matching circuit to make the phase difference between voltage and current zero and the quality factor of the dynamic matching circuit within a preset range includes: When power regulation fails, the output voltage frequency corresponding to the maximum current when the output voltage frequency of the power supply is adjusted is obtained as the first resonant frequency. A first equation is constructed based on the relationship between the first resonant frequency and the capacitance and inductance values, and a second equation is constructed based on the relationship between the quality factor and the capacitance and inductance values. Solve the first equation and the second equation simultaneously to obtain the first target capacitance value and the first target inductance value; The dynamic matching circuit is adjusted based on the first target capacitance value and the first target inductance value.

2. The impedance dynamic matching method for an ultrasonic transducer according to claim 1, characterized in that, The step of adjusting the output voltage frequency of the power supply to make the phase difference between the voltage and current zero based on the voltage-current phase difference signal, and determining whether the power supply regulation has failed, includes: Adjust the output voltage frequency of the power supply, synchronously acquire the voltage and current phase difference signal, and determine whether the phase difference between voltage and current is zero; If it is zero, then the corresponding output voltage frequency will be used as the operating frequency; If it is not zero, continue to adjust the output voltage frequency until it traverses the voltage frequency range of the power supply; If the voltage frequency range of the power supply is traversed and the operating frequency does not exist, then the power supply regulation is determined to be faulty.

3. The impedance dynamic matching method for an ultrasonic transducer according to claim 2, characterized in that, After stating that if the value is zero, the corresponding output voltage frequency will be used as the operating frequency, the method further includes: Using the operating frequency as the second resonant frequency, a third equation is constructed regarding the second resonant frequency, capacitance value, and inductance value; and a fourth equation is constructed regarding the quality factor, capacitance value, and inductance value. Solve the third equation and the fourth equation simultaneously to obtain the second target capacitance value and the second target inductance value; The dynamic matching circuit is adjusted based on the second target capacitance value and a majority of the second target inductance values.

4. The impedance dynamic matching method for an ultrasonic transducer according to claim 1, characterized in that, The acquisition of the voltage-current phase difference signal includes: Acquire transducer voltage detection signal and transducer current detection signal; Based on the transducer voltage detection signal and the transducer current detection signal, the phase difference between voltage and current is calculated, and the voltage-current phase difference signal is generated.

5. An ultrasonic transducer device, characterized in that: The device includes a transducer body (900), a power supply module (910), a control module (920), a phase detection circuit (930), and a dynamic matching circuit (940). The power supply module (910) is electrically connected to the transducer body (900) through the dynamic matching circuit (940). The control module (920) is connected to the controlled terminal of the dynamic matching circuit (940) and the controlled terminal of the power supply module (910). The control module (920) is electrically connected to the transducer body (900) through the phase detection circuit (930). The control module (920) is capable of executing the impedance dynamic matching method for an ultrasonic transducer as described in any one of claims 1 to 4.

6. The ultrasonic transducer device according to claim 5, characterized in that: The dynamic matching circuit (940) includes a variable capacitor unit, a variable inductor unit, and an adjustment unit. The variable capacitor unit is connected in series with the variable inductor unit. The two ends of the variable capacitor unit are electrically connected to the transducer body (900). The adjustment unit is connected to the variable capacitor unit and the variable inductor unit. The control module (920) is electrically connected to the adjustment unit.

7. The ultrasonic transducer device according to claim 5, characterized in that: The phase detection circuit (930) includes a voltage detection unit and a current detection unit. Both the voltage detection unit and the current detection unit are electrically connected to the transducer body (900) or to the output terminal of the dynamic matching circuit (940). The control module (920) is electrically connected to the voltage detection unit and the current detection unit respectively.

8. The ultrasonic transducer device according to claim 5, characterized in that, It also includes an isolation circuit (950), through which the control module (920) is electrically connected to the controlled terminal of the dynamic matching circuit (940), the controlled terminal of the power supply module (910), and the phase detection circuit (930).

9. The ultrasonic transducer device according to claim 5, characterized in that, It also includes a communication module (960), the control module (920) is electrically connected to the communication module (960), and the communication module (960) is used to communicate with the host computer.

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