An ultrasonic driving apparatus and a control method thereof

Abstract

The application discloses an ultrasonic driving device and a control method thereof. The ultrasonic driving device comprises a signal generator, a power amplifier and a transducer. The output end of the signal generator is connected with the power amplifier, and the output end of the power amplifier is connected with the transducer. The control method comprises the following steps: acquiring real-time sampling data of the power amplifier, calculating real-time impedance and voltage-current phase difference of the transducer according to the real-time sampling data, and adjusting the direct current bias voltage of the power amplifier and the frequency of the driving signal of the signal generator according to the real-time impedance and the voltage-current phase difference so that the transducer is in a preset resonance state. The embodiment of the application can make the transducer work in the preset resonance state and continuously and stably output.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of medical devices, and in particular to an ultrasonic driving device and a control method thereof. BACKGROUND

[0002] Ultrasonic ablation denervation is to kill nerve cells around blood vessels by non-focused ultrasonic waves emitted by a balloon at the distal end of a catheter through catheter intervention in the human body, to inhibit excessive activity of sympathetic nerves, and to treat pulmonary arterial hypertension and intractable hypertension.

[0003] The principle of ultrasonic ablation is that a device outputs a sinusoidal electric signal to excite a transducer in a balloon at the distal end of a catheter to generate ultrasonic waves, and the transducer works in a purely resistive resonance state, which is the state with the highest efficiency of electric energy conversion into ultrasonic waves and the least heat generation.

[0004] In the prior art, the impedance of the transducer may change due to manufacturing process, heat generation during work, and the degree of extrusion of the balloon, so it is difficult to ensure that the transducers of all catheters maintain a good resonance state throughout the process through impedance calibration during production. SUMMARY

[0005] Therefore, the embodiments of the present application provide an ultrasonic driving device and a control method thereof to solve the technical problem that the transducer cannot work in a resonance state in the prior art.

[0006] The technical solutions of the present application are as follows:

[0007] The first aspect of the embodiments of the present application provides a control method of an ultrasonic driving device, the ultrasonic driving device comprising a signal generator, a power amplifier and a transducer, the output end of the signal generator being connected with the power amplifier, and the output end of the power amplifier being connected with the transducer, the control method comprising: acquiring real-time sampling data of the power amplifier; calculating real-time impedance and voltage-current phase difference of the transducer according to the real-time sampling data; and adjusting direct current bias voltage of the power amplifier and the frequency of a driving signal of the signal generator according to the real-time impedance and the voltage-current phase difference to make the transducer be in a preset resonance state.

[0008] Optionally, the real-time sampling data comprises an output voltage peak value of the power amplifier, a first sampling voltage peak value and a second sampling voltage peak value; and the calculating of the real-time impedance and the voltage-current phase difference of the transducer according to the real-time sampling data comprises: determining a relationship formula of the real-time impedance and the voltage-current phase difference based on the output voltage peak value, the first sampling voltage peak value and the second sampling voltage peak value; and calculating the real-time impedance and the voltage-current phase difference according to the relationship formula.

[0009] Optionally, the relationship formula is:

[0010]

[0011] wherein, V4 is the first sampling voltage peak value, V5 is the second sampling voltage peak value, V is the output voltage peak value, R is a sampling resistance parameter, N is a sampling coil parameter, Z is the real-time impedance, and θ is the voltage-current phase difference.

[0012] Optionally, the adjusting the DC bias voltage of the power amplifier and the frequency of the driving signal of the signal generator according to the real-time impedance and the voltage-current phase difference to make the transducer in a preset resonant state comprises: adjusting the DC bias voltage according to the real-time impedance to make the value of the voltage-current phase difference minimum; and adjusting the frequency of the driving signal to make the transducer in a preset resonant state.

[0013] Optionally, the adjusting the DC bias voltage according to the real-time impedance to make the value of the voltage-current phase difference minimum comprises: comparing the real-time impedance with a preset matching impedance; and changing the DC bias voltage until the value of the voltage-current phase difference is minimum if the real-time impedance does not match the preset matching impedance; and the adjusting the frequency of the driving signal to make the transducer in a preset resonant state comprises: adjusting the frequency of the driving signal, sweeping the driving signal, and obtaining an adjusting frequency corresponding to the minimum voltage-current phase difference; and setting the frequency of the driving signal as the adjusting frequency.

[0014] Optionally, the input power of the power amplifier is adjusted according to the DC bias voltage when the DC bias voltage is adjusted according to the real-time impedance.

[0015] Optionally, before the real-time sampling data is obtained, the method further comprises: identifying a catheter type of the transducer; and selecting a matching network connected to the transducer according to the catheter type; and after the transducer is made in a preset resonant state, the method further comprises: controlling the output power of the power amplifier to make the output active power of the power amplifier reach an expected power.

[0016] The second aspect of the embodiment of the present application provides an ultrasonic driving device, comprising: a signal generator configured to generate a driving signal and send the driving signal to a power amplifier; the power amplifier configured to generate a sine signal with different power according to the driving signal; a transducer configured to convert electric energy into mechanical energy and output according to the sine signal; a feedback module configured to obtain real-time sampling data of the power amplifier; and a control module configured to perform the control method as described in the first aspect of the embodiment of the present application and any one of the first aspect.

[0017] Optionally, the feedback module comprises a voltage transformer, a current transformer, a first sampling resistor, a second sampling resistor, a first diode, a second diode, a first capacitor and a second capacitor, the voltage transformer and the current transformer are arranged at the output end of the power amplifier, one end of the voltage transformer is connected with one end of the first sampling resistor and the positive electrode of the first diode respectively, the other end of the first sampling resistor is connected with one end of the current transformer and one end of the second sampling resistor respectively, the other end of the second sampling resistor is connected with the other end of the voltage transformer, the other end of the current transformer and the positive electrode of the second diode respectively, the negative electrode of the first diode is connected with the negative electrode of the second diode in sequence through the first capacitor, the second capacitor and the second diode, and the negative electrode of the first diode, the negative electrode of the second diode, one end of the voltage transformer and one end of the current transformer are connected with the control module respectively.

[0018] Optionally, the ultrasonic driving device further comprises a power supply current monitoring circuit, a catheter detection circuit and a plurality of matching networks, one end of the power supply current monitoring circuit is connected with the power supply of the power amplifier, the other end is connected with the control module, one end of the catheter detection circuit is connected with the control module, the other end is connected with the catheter interface, one end of the matching network is connected with the transducer, the other end is connected with the power amplifier.

[0019] From the above technical solutions, the embodiments of the present application have the following advantages:

[0020] The ultrasonic driving device and the control method thereof provided by the embodiments of the present application, the ultrasonic driving device comprises a signal generator, a power amplifier and a transducer, the output end of the signal generator is connected with the power amplifier, the output end of the power amplifier is connected with the transducer, the control method acquires real-time sampling data of the power amplifier, calculates real-time impedance and voltage-current phase difference of the transducer according to the real-time sampling data, adjusts the direct current bias voltage of the power amplifier and the frequency of the driving signal of the signal generator according to the real-time impedance and the voltage-current phase difference so that the transducer is in a preset resonance state, the embodiments of the present application can make the transducer work in the preset resonance state and continuously and stably output. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly express the technical solutions of the embodiments of the present application, the drawings needed for the description of the embodiments will be briefly introduced as follows, obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0022] Figure 1 Flow chart of the control method of the ultrasonic driving device in the embodiment of the present application;

[0023] Figure 2 Flow chart of the control method of another ultrasonic driving device in the embodiment of the present application;

[0024] Figure 3 Structural schematic diagram of the ultrasonic driving device in the embodiment of the present application;

[0025] Figure 4 Structural schematic diagram of another ultrasonic driving device in the embodiment of the present application;

[0026] Figure 5 Structural schematic diagram of another ultrasonic driving device in the embodiment of the present application;

[0027] Figure 6 Circuit principle diagram of the ultrasonic driving device in the embodiment of the present application;

[0028] Figure 7 Flow chart of the working process of the ultrasonic driving device in the embodiment of the present application;

[0029] Figure 8 Adjustment schematic diagram of the direct current bias voltage in the embodiment of the present application;

[0030] Figure 9 Circuit principle diagram of the catheter detection circuit in the embodiment of the present application;

[0031] Figure 10 Circuit principle diagram of the matching network in the embodiment of the present application;

[0032] Figure 11 Circuit principle diagram of the feedback module in the embodiment of the present application. DETAILED DESCRIPTION

[0033] In order to enable persons skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by persons skilled in the art without creative work fall within the protection scope of the present application.

[0034] The embodiment of the present application provides a control method of an ultrasonic driving device, and a structural schematic diagram of the ultrasonic driving device is as shown in Figure 3As shown, the device includes a signal generator, a power amplifier, and a transducer. The output of the signal generator is connected to the power amplifier, and the output of the power amplifier is connected to the transducer. The ultrasonic driving device also includes a control module and a feedback module. The control module controls the signal generator to generate a driving signal and sends the driving signal to the power amplifier. The power amplifier generates sinusoidal signals of different powers according to the driving signal and outputs them to the transducer. The transducer converts electrical energy into mechanical energy according to the sinusoidal signals and outputs it. The control method of this embodiment is executed by the control module, and real-time sampling data is collected by the feedback module.

[0035] The control method of the ultrasonic drive device according to the embodiments of the present invention, such as Figure 1 As shown, it includes:

[0036] Step S100: Obtain real-time sampling data from the power amplifier. The real-time sampling data includes parameters such as the output current and voltage of the power amplifier. The real-time impedance and voltage-current phase difference of the transducer are calculated using these parameters.

[0037] Step S200: Calculate the real-time impedance and voltage-current phase difference of the transducer based on the real-time sampled data. Specifically, there is a transformation relationship between the real-time sampled data and the real-time impedance and voltage-current phase difference. By analyzing the relationship between the real-time sampled data and the real-time impedance and voltage-current phase difference, the real-time impedance and voltage-current phase difference can be calculated based on this relationship.

[0038] Step S300: Adjust the DC bias voltage of the power amplifier and the frequency of the drive signal of the signal generator according to the real-time impedance and voltage-current phase difference to bring the transducer to a preset resonant state. Based on the transducer's operating principle, the transducer needs to be matched with the cables inside the conduit. According to radio frequency transmission theory, to effectively transmit the signal to the transducer, impedance matching is required, ensuring that the transducer's output impedance matches the power transmission line impedance. For example, if the output impedance of the power amplifier and its internal circuitry is 50Ω, the transducer's output impedance is also 50Ω. Under theoretical conditions, the real-time impedance in the preset resonant state is equal to the power amplifier's output impedance, and the voltage-current phase difference is zero.

[0039] In actual work, the impedance of the transducer changes with temperature, so the output impedance of the power amplifier circuit needs to be adjusted in real time. Specifically, the power amplifier uses a mos tube as an amplifying tube, and the direct current bias voltage is specifically a gate-source direct current bias voltage Vgs. For the mos tube, as the direct current bias voltage Vgs increases, the conduction angle first increases and then decreases, and in the absence of gain control, the output power also first increases and then decreases. Gain control can regulate the output power, and the impedance of the mos tube will also change. When the ultrasonic driving device is working, the output impedance of the power amplifier is composed of the mos tube and the inductance inside the power amplifier. After the mos tube is selected, the mos tube drain-source current Ids is related to the direct current bias voltage Vgs, and the mos tube drain-source current Ids increases with the increase of the direct current bias voltage Vgs. The mos tube drain-source voltage Vds remains unchanged. According to Ohm's law R=U / I, the output impedance of the power amplifier can be adjusted by adjusting the direct current bias voltage Vgs, so that impedance matching can be realized when the impedance of the transducer changes.

[0040] The frequency of the driving signal of the signal generator is adjusted to adjust the voltage-current phase difference of the transducer to be equal to zero. Different frequencies of the driving signal will change the voltage-current phase difference of the transducer. The transducer has the highest efficiency of converting electrical energy into ultrasonic waves and the least heat production when the voltage-current phase difference is equal to zero, that is, in a purely resistive resonant state. Therefore, the embodiment of the present application acquires the voltage-current phase difference of the transducer in real time, and then adjusts the frequency of the driving signal of the signal generator in real time. When the voltage-current phase difference of the transducer increases, the adjustment can be made in time, so that the transducer can work in a resonant state with a voltage-current phase difference equal to zero.

[0041] The control method of the ultrasonic driving device of the embodiment of the present application acquires real-time sampling data of the power amplifier, calculates real-time impedance and voltage-current phase difference of the transducer according to the real-time sampling data, adjusts the direct current bias voltage of the power amplifier and the frequency of the driving signal of the signal generator according to the real-time impedance and voltage-current phase difference to make the transducer be in a preset resonant state. The embodiment of the present application can make the transducer work in a preset resonant state, can make the transducer continuously and stably output, and has the highest efficiency of converting electrical energy into ultrasonic waves.

[0042] In an embodiment, the real-time sampling data includes an output voltage peak value of the power amplifier, a first sampling voltage peak value and a second sampling voltage peak value; the real-time impedance and voltage-current phase difference of the transducer are calculated according to the real-time sampling data, including: determining a relationship formula of the real-time impedance and voltage-current phase difference based on the output voltage peak value, the first sampling voltage peak value and the second sampling voltage peak value; and calculating the real-time impedance and voltage-current phase difference according to the relationship formula. Specifically, the relationship formula is:

[0043]

[0044] Wherein, V4 is the first sampling voltage peak value, V5 is the second sampling voltage peak value, V is the output voltage peak value, R is the sampling resistance parameter, N is the sampling coil parameter, Z is the real-time impedance, and θ is the voltage current phase difference.

[0045] The embodiment of the present application can obtain the real-time impedance and the voltage current phase difference of the transducer in real time by calculating the real-time impedance and the voltage current phase difference according to the output voltage peak value, the first sampling voltage peak value and the second sampling voltage peak value of the power amplifier, and the sampling data is the voltage peak value, which is convenient for collection and acquisition.

[0046] In an embodiment, the direct current bias voltage of the power amplifier and the frequency of the driving signal of the signal generator are adjusted according to the real-time impedance and the voltage current phase difference to make the transducer in a preset resonance state, comprising:

[0047] In step S310, the direct current bias voltage is adjusted according to the real-time impedance to make the value of the voltage current phase difference minimum. Specifically, the direct current bias voltage is adjusted to adjust the real-time impedance of the transducer, so that the real-time impedance reaches the preset matching impedance. According to the working characteristics of the transducer, when the real-time impedance and the preset matching impedance are the same, the voltage current phase difference is minimum, so whether the impedance matching is completed can be judged according to whether the voltage current phase difference can reach the minimum value. In addition, it needs to be understood that when the direct current bias voltage is adjusted, the real-time current of the power amplifier needs to be monitored to avoid the real-time current exceeding the maximum current of the power amplifier, and the direct current bias voltage also cannot exceed the adjustment range of the direct current bias voltage of the power amplifier, so as to protect the power amplifier. If the direct current bias voltage reaches the limit of the adjustment range, it directly enters step S320. The adjustment range of the direct current bias voltage is the parameter of the power amplifier, which can be obtained according to the use instruction.

[0048] In step S320, the frequency of the driving signal is adjusted to make the transducer in a preset resonance state. The frequency of the driving signal is different, which can change the voltage current phase difference of the transducer, so the frequency of the driving signal can be adjusted to make the transducer in a preset resonance state. Exemplarily, after the real-time voltage current phase difference is obtained, it is judged whether the preset resonance state is reached. If the preset resonance state is not reached, the frequency of the driving signal is further increased, and the judgment is performed again until the preset resonance state is reached.

[0049] In an embodiment, the DC bias voltage is adjusted according to the real-time impedance to minimize the value of the voltage-current phase difference, including: comparing the size of the real-time impedance and a preset matching impedance, and if the real-time impedance does not match the preset matching impedance, changing the DC bias voltage until the value of the voltage-current phase difference is minimized; specifically, the preset matching impedance is a comparison reference value of the transducer impedance, by which it is determined whether the real-time impedance of the transducer is increased or decreased, if the real-time impedance is less than the preset matching impedance, it indicates that the real-time impedance of the transducer is decreased, and thus the DC bias voltage, specifically the gate-source DC bias voltage Vgs, needs to be increased, so as to increase the current Ids and decrease the impedance of the power amplifier, if the real-time impedance is greater than the preset matching impedance, the DC bias voltage is decreased, and the DC bias voltage is adjusted in this way until the value of the voltage-current phase difference is minimized.

[0050] The frequency of the driving signal is adjusted to make the transducer in a preset resonance state, including: adjusting the frequency of the driving signal, sweeping the driving signal, and obtaining the adjustment frequency corresponding to the minimum voltage-current phase difference; and setting the frequency of the driving signal as the adjustment frequency.

[0051] The control method of the embodiment of the present application is novel, and compared with the existing control method of the adjustable inductance and capacitance value, the cost is low and the implementation is convenient.

[0052] In an embodiment, when the DC bias voltage is adjusted according to the real-time impedance, the input power of the power amplifier is adjusted according to the DC bias voltage. Since the gain of the power amplifier will change when the DC bias voltage is adjusted, in order to keep the output of the power amplifier stable, the input power of the power amplifier needs to be adjusted accordingly, so that the output power is relatively stable. Specifically, the input power of the power amplifier can be adjusted by a controllable attenuator to keep the output power of the power amplifier stable, and the control process is carried out under relatively stable power.

[0053] In an embodiment, before the real-time sampling data is obtained, the method further includes: identifying the type of the catheter of the transducer; and selecting a matching network connected to the transducer according to the type of the catheter. Specifically, after the catheter is connected to the corresponding interface, the voltage of the catheter is sampled by the catheter detection circuit as shown in Figure 9 , and the type of the catheter is determined according to the sampled voltage.

[0054] In an embodiment, after the transducer is made in a preset resonance state, the method further includes: controlling the output power of the power amplifier, so that the active power of the output of the power amplifier reaches an expected power, and the expected power is a preset setting value. After the frequency of the driving signal is adjusted to make the transducer in a preset resonance state, the output active power of the power amplifier is controlled to reach the expected power, so that the transducer keeps stable power output.

[0055] In an embodiment, asFigure 2 As shown in the figure, the control method of the ultrasonic driving device comprises:

[0056] The main control module receives and processes the real-time sampling data, and calculates the real-time impedance and voltage-current phase difference of the transducer according to the real-time sampling data. The direct current bias voltage of the power tube (i.e. the mos tube of the amplification function) in the power amplifier is adjusted so that the real-time impedance reaches the preset matching impedance, at which time the voltage-current phase difference is minimum. When adjusting the direct current bias voltage, the real-time current of the power amplifier needs to be monitored to avoid the real-time current exceeding the maximum current of the power amplifier, and the direct current bias voltage also cannot exceed the adjustment range of the direct current bias voltage of the power amplifier, so as to protect the power amplifier. When the voltage-current phase difference reaches the minimum or the voltage adjustment of the direct current bias voltage reaches the limit of the adjustment range, the frequency of the driving signal of the signal generator is adjusted so that the transducer is in the preset resonance state. Since the gain of the power amplifier will change when the direct current bias voltage is adjusted, in order to keep the output of the power amplifier stable, the input power of the power amplifier needs to be adjusted accordingly so that the output power of the power amplifier is relatively stable.

[0057] After adjusting the frequency of the driving signal so that the transducer is in the preset resonance state, it is detected whether the output active power reaches the expectation. If not, the output power of the power amplifier is controlled so that the output active power of the power amplifier reaches the expected power, so that the transducer keeps stable power output.

[0058] The embodiment of the present application also provides an ultrasonic driving device, as shown in the figure, comprising: Figure 3 As shown in the figure, comprising:

[0059] A signal generator is configured to generate a driving signal and send the driving signal to the power amplifier.

[0060] The power amplifier is configured to generate a sine signal with different power according to the driving signal.

[0061] The transducer is configured to convert electrical energy into mechanical energy and output according to the sine signal. The principle of generating ultrasonic waves by the ultrasonic driving device is to generate mechanical vibration by the transducer.

[0062] The feedback module is configured to obtain real-time sampling data of the power amplifier.

[0063] The control module is configured to perform any control method in the method embodiments of the embodiment of the present application.

[0064] The ultrasonic driving device of the embodiment of the present application can make the transducer work in the preset resonant state, continuously and stably output, and has the highest efficiency of converting electric energy into ultrasonic waves.

[0065] In an embodiment, as shown in Figure 6 and Figure 11 The feedback module includes a voltage transformer T1, a current transformer T2, a first sampling resistor R1, a second sampling resistor R2, a first diode D1, a second diode D2, a first capacitor C1 and a second capacitor C2. The voltage transformer T1 and the current transformer T2 are arranged at the output end of the power amplifier. One end of the voltage transformer is connected with one end of the first sampling resistor R1 and the anode of the first diode D1, respectively. The other end of the first sampling resistor R1 is connected with one end of the current transformer T1 and one end of the second sampling resistor R2, respectively. The other end of the second sampling resistor R2 is connected with the other end of the voltage transformer T1, the other end of the current transformer T2 and the anode of the second diode D2, respectively. The cathode of the first diode D1 is connected with the cathode of the second diode D2 through the first capacitor C1 and the second capacitor C2 in sequence. The cathode of the first diode D1, the cathode of the second diode D2, one end of the voltage transformer T1 and one end of the current transformer T2 are connected with the control module, respectively. In the embodiment, the core unit of the control module is a control chip, which can be a single-chip microcomputer or an FPGA. The feedback module collects real-time sampling data and then sends the real-time sampling data to the control chip through an analog / digital converter. The control chip obtains amplitude and phase data such as voltage and current phase difference and output voltage and current peak value of the power amplifier after processing the real-time sampling data, and then sends the amplitude and phase data to the human-computer interaction part.

[0066] Specifically, the feedback module collects real-time sampling data including output voltage peak value of the power amplifier, first sampling voltage peak value and second sampling voltage peak value. The output voltage peak value of the power amplifier is collected by the voltage transformer. The first sampling voltage peak value and the second sampling voltage peak value are the voltage peak value at the cathode of the first diode (V4 point voltage peak value) and the voltage peak value at the cathode of the second diode (V5 point voltage peak value), respectively. Figure 11 Figure 11

[0067] Let the output voltage of the power amplifier be V0, the output current be I0, the output voltage peak value be V, Z be the real-time impedance, ω be the output sinusoidal signal frequency, and θ be the voltage and current phase difference. Then, V0=V*sinωT,

[0068] V0=V*sinωT,​​

[0069] The number of turns of voltage transformer T1 and current transformer T2 are N1 and N2 respectively. Then the voltage output of voltage transformer T1 is: The current output of current transformer T2 is In the circuit of this embodiment, N1 = N2 = N, because the voltage-current phase difference θ does not change with time after the transducer is determined. Figure 11 The voltages at points V2 and V3 can be transformed using the auxiliary angle formula to obtain the following result:

[0070]

[0071]

[0072] Where R is the sampling resistor parameter, and in this embodiment of the invention, the resistance values ​​of the first sampling resistor and the second sampling resistor are both R.

[0073] The voltages at points V2 and V3, after passing through the first and second diodes respectively to capture the positive half-cycle signals, charge the corresponding capacitors. After the circuit parameters are adjusted, points V4 and V5 generate low-voltage DC signals with amplitudes equal to the peak values ​​at points V2 and V3.

[0074]

[0075]

[0076] The voltages at points V4 and V5 are linearly isolated and converted from analog to digital by the acquisition circuit to obtain digital signals. Then, the processor calculates the sum of squares and the difference of squares. It can be seen that if... cosθ, as a variable, can be viewed as the following linear equation in two variables:

[0077]

[0078] Where N represents the sampling coil parameters, namely the number of turns of voltage transformer T1 and current transformer T2.

[0079] Based on the above relationship, after receiving the real-time sampling data, namely the output voltage peak of the power amplifier, the first sampling voltage peak, and the second sampling voltage peak, the control module can calculate the corresponding voltage-current phase difference and real-time impedance. Compared with the high-speed zero-crossing detection and acquisition circuit that is generally used to detect the voltage-current phase difference of high-frequency sinusoidal electrical signals, the feedback module of this invention does not need to use high-speed AD chips, high-speed operational amplifiers, high-speed isolation chips, etc., resulting in lower circuit cost and simpler circuit structure.

[0080] In one embodiment, such asFigure 4 As shown, the ultrasonic driving device also includes a power supply current monitoring circuit, a catheter detection circuit, and several matching networks. One end of the power supply current monitoring circuit is connected to the power supply of the power amplifier, and the other end is connected to the control module. One end of the catheter detection circuit is connected to the control module, and the other end is connected to the catheter interface. One end of the matching network is connected to the transducer, and the other end is connected to the power amplifier.

[0081] Specifically, the power supply current monitoring circuit is used to monitor the current of the power amplifier to prevent the real-time current of the power amplifier from exceeding the maximum set current of the power amplifier when the control method is executed, thereby protecting the power amplifier. For example... Figure 9 As shown, the catheter detection circuit samples the voltage of the catheter and determines the catheter type based on the sampled voltage. After determining the catheter type, the control module matches the corresponding matching network for that catheter. Figure 10 As shown, the matching network adopts LC passive broadband matching, and each type of conduit is equipped with a matching network to enable it to match the appropriate bandwidth.

[0082] In one embodiment, such as Figure 5 As shown, the ultrasound driving device also includes a human-machine interface module and a power supply module. The ultrasound driving device is powered by an external power source (such as a 220VAC / 50Hz mains power supply), which is converted to 28V DC voltage by the power supply module to power other modules within the device. The control module is the core control unit of the entire device, and its core is a control chip, which can be a microcontroller or an FPGA. The human-machine interface module includes, for example, a display component such as an LCD screen and supporting hardware driving circuitry, enabling user interaction through a graphical and text interface; a handle or foot switch component and supporting peripheral hardware circuitry; and components through which the user performs treatment start and stop commands.

[0083] The ultrasonic driving device of this invention has two operating modes: standby and operating. In standby mode, the power amplifier, signal generator, feedback module, and transducer are all inactive. In this mode, the user can perform operations such as connecting catheters, configuring, and viewing treatment parameters. In operating mode, after the device starts ultrasonic ablation according to the user's instructions, the signal generator sends a drive signal to the power amplifier, which then sends it to the transducer via a matching network. The matching network automatically identifies and matches different catheters. The control chip acquires real-time sampling data via the feedback module and calculates the voltage and current phase difference and amplitude based on the real-time sampling data. Figure 7 and Figure 8 As shown, matching and power adjustment are performed by adjusting the DC bias voltage Vgs of the power amplifier and the output frequency of the signal generator to maintain the transducer's output power as much as possible. For the specific adjustment process, please refer to the control method of the ultrasonic drive device in the above method embodiment, which will not be repeated here.

[0084] The above, the above examples are only to illustrate the technical solutions of the present application, rather than limit them; although the present application is described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still be modified to the technical solutions recorded in the foregoing examples, or equivalent replacement is made to part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A control method of an ultrasonic drive device, characterized by, The ultrasonic driving device comprises a signal generator, a power amplifier and a transducer, the output of the signal generator is connected with the power amplifier, the output of the power amplifier is connected with the transducer, and the control method comprises: acquiring real-time sampling data of the power amplifier; calculating real-time impedance and voltage-current phase difference of the transducer according to the real-time sampling data; adjusting direct current bias voltage of the power amplifier and frequency of driving signal of the signal generator according to the real-time impedance and the voltage-current phase difference to make the transducer in a preset resonance state; wherein the real-time sampling data of the power amplifier is acquired through a feedback module, the feedback module comprises a voltage transformer, a current transformer, a first sampling resistor, a second sampling resistor, a first diode, a second diode, a first capacitor and a second capacitor, the voltage transformer and the current transformer are arranged at the output of the power amplifier, one end of the voltage transformer is connected with one end of the first sampling resistor and the positive electrode of the first diode respectively, the other end of the first sampling resistor is connected with one end of the current transformer and one end of the second sampling resistor respectively, the other end of the second sampling resistor is connected with the other end of the voltage transformer, the other end of the current transformer and the positive electrode of the second diode respectively, the negative electrode of the first diode is connected with the first capacitor, the second capacitor and the negative electrode of the second diode in sequence, and the negative electrode of the first diode, the negative electrode of the second diode, one end of the voltage transformer and one end of the current transformer are connected with a control module respectively; the real-time sampling data comprises output voltage peak value of the power amplifier, first sampling voltage peak value and second sampling voltage peak value, and the first sampling voltage peak value and the second sampling voltage peak value are voltage peak values of the negative electrode of the first diode and the negative electrode of the second diode respectively; the calculation of the real-time impedance and the voltage-current phase difference of the transducer according to the real-time sampling data comprises: determining a relationship formula of the real-time impedance and the voltage-current phase difference based on the output voltage peak value, the first sampling voltage peak value and the second sampling voltage peak value; calculating the real-time impedance and the voltage-current phase difference according to the relationship formula; the relationship formula is: wherein V4 is the first sampling voltage peak value, V5 is the second sampling voltage peak value, V is the output voltage peak value, R is a sampling resistor parameter, N is a sampling coil parameter, Z is the real-time impedance, and θ is the voltage-current phase difference.

2. The control method of the ultrasonic drive apparatus according to claim 1, characterized by the adjustment of the direct current bias voltage of the power amplifier and the frequency of the driving signal of the signal generator according to the real-time impedance and the voltage-current phase difference to make the transducer in a preset resonance state comprises: adjusting the direct current bias voltage according to the real-time impedance to make the value of the voltage-current phase difference minimum; adjusting the frequency of the driving signal to make the transducer in a preset resonance state.

3. The control method of the ultrasonic drive apparatus according to claim 2, characterized by, the adjustment of the direct current bias voltage according to the real-time impedance to make the value of the voltage-current phase difference minimum comprises: Comparing the real-time impedance with a preset matching impedance, if the real-time impedance does not match the preset matching impedance, the DC bias voltage is changed until the voltage-current phase difference is minimum; The adjusting the frequency of the driving signal to make the transducer in a preset resonance state comprises: Adjusting the frequency of the driving signal, sweeping the driving signal, and obtaining the adjusting frequency corresponding to the minimum voltage-current phase difference; Setting the frequency of the driving signal as the adjusting frequency.

4. The control method of an ultrasonic drive apparatus according to claim 2, characterized by When adjusting the DC bias voltage according to the real-time impedance, the input power of the power amplifier is adjusted according to the DC bias voltage.

5. The control method of the ultrasonic drive apparatus according to claim 1, characterized by Before obtaining the real-time sampling data, the method further comprises: Identifying the catheter type of the transducer; Selecting a matching network accessing the transducer according to the catheter type; After making the transducer in a preset resonance state, the method further comprises: Controlling the output power of the power amplifier to make the output active power of the power amplifier reach an expected power.

6. An ultrasonic drive apparatus characterized by comprising: Comprises: A signal generator for generating a driving signal and sending the driving signal to a power amplifier; The power amplifier for generating a sine signal with different power according to the driving signal; A transducer for converting electrical energy into mechanical energy and outputting according to the sine signal; A feedback module for obtaining real-time sampling data of the power amplifier; A control module for performing the control method according to any one of claims 1 to 5.

7. The ultrasonic drive apparatus according to claim 6, characterized by The feedback module comprises a voltage transformer, a current transformer, a first sampling resistor, a second sampling resistor, a first diode, a second diode, a first capacitor and a second capacitor, the voltage transformer and the current transformer are arranged at the output end of the power amplifier, one end of the voltage transformer is connected with one end of the first sampling resistor and the anode of the first diode respectively, the other end of the first sampling resistor is connected with one end of the current transformer and one end of the second sampling resistor respectively, the other end of the second sampling resistor is connected with the other end of the voltage transformer, the other end of the current transformer and the anode of the second diode respectively, the cathode of the first diode is connected with the first capacitor, the second capacitor and the cathode of the second diode in turn, the cathode of the first diode, the cathode of the second diode, one end of the voltage transformer and one end of the current transformer are connected with the control module respectively.

8. The ultrasonic drive apparatus according to claim 6, characterized by Further comprising a power supply current monitoring circuit, a catheter detection circuit and a plurality of matching networks, one end of the power supply current monitoring circuit is connected with the power supply of the power amplifier, the other end is connected with the control module, one end of the catheter detection circuit is connected with the control module, the other end is connected with the catheter interface, one end of the matching network is connected with the transducer, the other end is connected with the power amplifier.

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