Voltage compensation circuit and ultrasonic knife control system

Abstract

The utility model provides a voltage compensation circuit and an ultrasonic knife control system. The ultrasonic knife compensation circuit comprises a driving module for outputting working voltage to an ultrasonic knife transducer, a signal acquisition unit for acquiring a voltage signal and a current signal output by the ultrasonic knife transducer, and a signal conversion module for converting the voltage signal and the current signal into corresponding square wave signals, the operational amplification module is used for acquiring an impedance value of a load on the ultrasonic knife transducer and a phase difference between an output voltage and an output current of the ultrasonic knife transducer based on the square wave signal; the voltage compensation module, the first switch and the second switch are electrically connected between the ultrasonic knife transducer and the driving module; the control module controls the first switch to be switched on and the second switch to be switched off based on the impedance value smaller than or equal to the impedance threshold value or controls the first switch to be switched on and the second switch to be switched on based on the phase difference smaller than or equal to the phase difference threshold value. Whether the ultrasonic knife transducer enters resonance or not can be accurately judged, and the circuit is simple in structure and high in stability.

Description

Technical Field

[0001] The utility model relates to the technical field of ultrasonic surgical instruments, in particular to a voltage compensation circuit and an ultrasonic knife control system. Background Art

[0002] The surgical ultrasonic scalpel is a new technology that has been put into clinical use in China in recent years and has developed rapidly. It realizes a non-destructive treatment model that improves the physiological and pathological state of tissues, and then adopts a surgical treatment method that destroys tissues, eliminates lesions, and restores tissue and body health.

[0003] Before performing surgery, an ultrasonic scalpel performs a no-load self-test to determine whether the ultrasonic scalpel transducer is resonant (i.e., the phase difference between the ultrasonic scalpel transducer's output voltage and current is less than the set value) to ensure proper function. The ultrasonic scalpel control system uses a current negative feedback system or current PID control to ensure current stability, adapting to different load tissues and ensuring cutting efficiency and speed.

[0004] When the ultrasonic knife device is performing no-load self-test, the load is very small, that is, the load at this time is the impedance of the ultrasonic knife transducer and the blade head itself, and the output current of the ultrasonic knife transducer is much smaller than the normal operating current. For example, the output current under no-load is less than 10% of the normal operating current, resulting in the output voltage of the ultrasonic knife transducer also being much smaller than the normal operating voltage, that is, less than 5% of the normal operating voltage. Therefore, the output current and output voltage generated by the ultrasonic knife transducer under no-load are more easily affected by the interference signals generated by the device differences of the driving module of the ultrasonic knife host system, system electromagnetic noise, ambient temperature, external electromagnetic noise, and the instability of the system itself, resulting in the voltage acquisition circuit and the current acquisition circuit being unable to collect or accurately collect the corresponding output current and output voltage, making it impossible for the ultrasonic knife host system to accurately calculate the corresponding phase difference, resulting in the inability or inaccurate judgment of whether the ultrasonic knife transducer has entered the resonant state, causing the ultrasonic knife system no-load self-test to fail to operate normally or make an erroneous judgment, thereby causing a medical accident.

[0005] like Figure 1-2 As shown, the normal voltage waveform of the ultrasonic knife transducer is a sine wave. After passing through the ultrasonic knife system's built-in zero-crossing comparison circuit, it outputs a square wave, which is then input into the ultrasonic knife host system to calculate the phase difference between the output voltage and output current of the ultrasonic knife transducer. When there is interference in the ultrasonic knife transducer voltage waveform, the irregular sine wave is the voltage waveform after the interference signal is superimposed. After passing through the ultrasonic knife system's built-in zero-crossing comparison circuit, it outputs a square wave. The square wave also becomes abnormal and is then input into the ultrasonic knife host system to calculate the voltage and current phase difference of the ultrasonic knife transducer. The ultrasonic knife system cannot determine whether it is resonant. For example, when the ultrasonic knife transducer is in no-load self-test, if Figure 3As shown in the figure, the voltage acquisition circuit collects the output voltage signal of the ultrasonic knife transducer. In an environment without interference signals, the peak value of the sine wave is 0.33V. Due to the influence of the actual interference signal, the interference signal (voltage value is -0.2V) will be superimposed on the sine wave signal, so that the irregular sine wave signal has a negative value of -0.1V. Therefore, within one twelfth cycle of the sine wave (the sine wave voltage is ≈0.1V at this time), the voltage signal will have two zero crossing points, resulting in the voltage signal passing through the zero-crossing comparison circuit. The corresponding square wave signal is abnormal, as shown in FIG. Figure 4 As shown, the control module will determine that the ultrasonic knife transducer has no resonance, causing the ultrasonic knife host system to not work properly.

[0006] The existing ultrasonic knife phase difference detection method for eliminating signal interference adopts digital filtering, passive filtering or active filtering. Since the signal-to-noise ratio of the ultrasonic knife transducer output voltage signal collected when no-load is much lower than the signal-to-noise ratio during normal cutting, the real voltage signal will also be filtered out in the process of filtering out the interference signal, and the ultrasonic knife transducer output voltage signal cannot be accurately collected, resulting in the ultrasonic knife system being unable to determine whether the ultrasonic knife transducer has entered resonance, thereby causing the ultrasonic knife equipment to fail to work normally. Summary of the Invention

[0007] In order to overcome the above-mentioned defects in the prior art, the purpose of the present invention is to provide a voltage compensation circuit and an ultrasonic knife control system.

[0008] In order to achieve the above-mentioned object of the present invention, the present invention provides a voltage compensation circuit suitable for eliminating interference signals that are prone to distortion of the working voltage signal of an ultrasonic scalpel device in a no-load state. The ultrasonic scalpel device includes an ultrasonic scalpel transducer that outputs the working voltage, including:

[0009] a driving module, electrically connected to the ultrasonic scalpel transducer, and configured to output the operating voltage to the ultrasonic scalpel transducer;

[0010] a signal acquisition unit, electrically connected to the ultrasonic scalpel transducer, and configured to acquire the voltage signal and current signal output by the ultrasonic scalpel transducer;

[0011] a signal conversion module, electrically connected to the signal acquisition unit, for receiving the voltage signal and the current signal, and converting them into corresponding square wave voltage signals and square wave current signals;

[0012] an operational amplifier module, electrically connected to the signal conversion module, configured to receive the square wave voltage signal and the square wave current signal, and obtain an impedance value of a load on the ultrasonic scalpel transducer and a phase difference between an output voltage and an output current of the ultrasonic scalpel transducer based on the square wave voltage signal and the square wave current signal;

[0013] A voltage compensation module is electrically connected between the ultrasonic scalpel transducer and the driving module, and is used to compensate for the working voltage output by the ultrasonic scalpel transducer;

[0014] A first switch is electrically connected between the ultrasonic scalpel transducer and the voltage compensation module or between the driving module and the voltage compensation module;

[0015] a second switch electrically connected between the ultrasonic scalpel transducer and the driving module, wherein the first switch and the second switch are connected in parallel between the ultrasonic scalpel transducer and the driving module;

[0016] a control module electrically connected to the driving module, the operational amplifier module, the control end of the first switch, and the control end of the second switch; the control module receives the impedance value and controls the first switch to be closed and the second switch to be open based on the impedance value being less than or equal to an impedance threshold; or the control module receives the phase difference and controls the first switch to be open and the second switch to be closed based on the phase difference being less than or equal to a phase difference threshold.

[0017] This voltage compensation circuit can accurately determine whether the ultrasonic knife transducer enters resonance. It can not only improve the stability of the ultrasonic knife device in maintaining the resonant state, but also improve the speed and accuracy of the ultrasonic knife device in achieving resonance under no-load state. The circuit structure is simple and the stability is high, which has obvious application value.

[0018] In an optional solution of the voltage compensation circuit, the signal acquisition unit includes:

[0019] a voltage acquisition module, electrically connected between the ultrasonic scalpel transducer and the signal conversion module, and configured to acquire the voltage signal output by the ultrasonic scalpel transducer;

[0020] The current acquisition module is electrically connected between the ultrasonic scalpel transducer and the signal conversion module, and is used to acquire the current signal output by the ultrasonic scalpel transducer.

[0021] In an optional solution of the voltage compensation circuit, the signal conversion module includes:

[0022] a first zero-crossing comparator, electrically connected to the voltage acquisition module and the operational amplifier module, respectively, to convert the voltage signal acquired by the voltage acquisition module into a square wave voltage signal and send the square wave voltage signal to the operational amplifier module;

[0023] The second zero-crossing comparator is electrically connected to the current acquisition module and the operational amplifier module respectively, converts the current signal acquired by the current acquisition module into a square wave current signal, and sends the square wave current signal to the operational amplifier module.

[0024] In an optional solution of the voltage compensation circuit, the operational amplifier module includes:

[0025] a first operational amplifier, electrically connected to the output terminal of the signal conversion module, and configured to obtain the impedance value based on the voltage signal and the square wave current signal;

[0026] The second operational amplifier is electrically connected to the output end of the signal conversion module and obtains the phase difference based on the square wave voltage signal and the square wave current signal.

[0027] In an optional solution of the voltage compensation circuit, the operational amplifier module includes:

[0028] a first operational amplifier, wherein a first input terminal of the first operational amplifier is connected to the output terminal of the first zero-crossing comparator, a second input terminal of the first operational amplifier is connected to the output terminal of the second zero-crossing comparator, and an output terminal of the first operational amplifier is connected to a corresponding signal input terminal of the control module;

[0029] The second operational amplifier has a first input connected to the output of the first zero-crossing comparator, a second input connected to the output of the second zero-crossing comparator, and an output connected to the corresponding signal input of the control module.

[0030] In an optional solution of the voltage compensation circuit, the first switch and / or the second switch is a relay module or a MOS switch module.

[0031] In an optional solution of the voltage compensation circuit, the voltage compensation module includes a non-inductive resistor.

[0032] The present application also provides an ultrasonic scalpel control system, which includes the above-mentioned voltage compensation circuit.

[0033] The beneficial effects of the utility model are:

[0034] The present application improves the output voltage of the ultrasonic knife transducer by compensating the load, reduces the influence of device differences, system electromagnetic noise, external electromagnetic noise, and ambient temperature on the voltage acquisition of the ultrasonic knife transducer, and enables the ultrasonic knife control system to truly acquire the output voltage signal waveform of the ultrasonic knife transducer when the ultrasonic knife device is performing self-test, that is, tracking the resonant frequency in the no-load state, thereby realizing accurate detection of the voltage and current phase difference of the ultrasonic knife transducer, avoiding deviations in the calculation of the voltage and current phase difference of the ultrasonic knife transducer by the ultrasonic knife control system, ensuring the accuracy and stability of obtaining the resonant state of the ultrasonic knife transducer, and enabling the ultrasonic knife device to be used normally after self-test.

[0035] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0037] Figure 1 This is the voltage waveform of a normal ultrasonic scalpel transducer;

[0038] Figure 2 yes Figure 1 The waveform is output as a square wave waveform after passing through the zero-crossing comparison module of the ultrasonic knife system;

[0039] Figure 3 This is the voltage waveform of the ultrasonic scalpel transducer when there is interference in the voltage waveform of the ultrasonic scalpel transducer;

[0040] Figure 4 yes Figure 3 The waveform is output as an abnormal square wave waveform after passing through the zero-crossing comparison module of the ultrasonic knife system;

[0041] Figure 5 This is a principle block diagram of the utility model;

[0042] Figure 6 4 is a waveform diagram of the voltage signal of the ultrasonic knife transducer after passing through the first zero-crossing comparator in Example 1. DETAILED DESCRIPTION

[0043] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0044] In the description of the present utility model, unless otherwise specified and limited, it should be noted that the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a mechanical connection or an electrical connection, or it can be the internal connection between two components. It can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to the specific circumstances.

[0045] Example 1

[0046] like Figure 5As shown, this embodiment provides a voltage compensation circuit that is particularly suitable for eliminating interference signals that can easily cause distortion of the operating voltage signal of an ultrasonic scalpel device in a no-load state. The ultrasonic scalpel device includes an ultrasonic scalpel transducer that outputs the operating voltage, and the ultrasonic scalpel transducer outputs a resonant sinusoidal wave signal for driving the ultrasonic scalpel head. This voltage compensation circuit can not only improve the stability of the ultrasonic scalpel device in maintaining a resonant state, but also improve the speed and accuracy of the ultrasonic scalpel device in achieving resonance in a no-load state. Specifically, the voltage compensation circuit in this embodiment includes: a control module, a drive module, a signal acquisition unit, a signal conversion module, an operational amplifier module, a voltage compensation module, a first switch, and a second switch.

[0047] The drive module is a drive signal generation module that drives the ultrasonic scalpel transducer to output a resonant sinusoidal wave signal and is used to provide an operating voltage to the ultrasonic scalpel transducer. The control module is electrically connected to the drive module and outputs a control signal to the drive module. The drive module, based on the control signal, provides the operating voltage to the ultrasonic scalpel transducer to drive the ultrasonic scalpel transducer into operation.

[0048] The voltage compensation module is electrically connected between the ultrasonic scalpel transducer and the driving module, and is used to compensate for the working voltage output by the ultrasonic scalpel transducer. The first switch is electrically connected between the ultrasonic scalpel transducer and the voltage compensation module or between the driving module and the voltage compensation module. In this embodiment, the output end of the driving module is connected to the input end of the first switch, the output end of the first switch is connected to the input end of the voltage compensation module, and the output end of the voltage compensation module is connected to the working voltage input end of the ultrasonic scalpel transducer. The control end of the first switch is electrically controlled and connected to the control module, and is controlled by the control module to turn it on or off. The first switch is preferably, but not limited to, a switching device such as a relay module and a MOS tube.

[0049] The output end of the driver module is also connected to the input end of a second switch. The second switch is electrically connected between the ultrasonic scalpel transducer and the driver module. That is, the output end of the second switch is electrically connected to the input end of the ultrasonic scalpel transducer. The control end of the second switch is electrically connected to the control module, and the control module controls the second switch to be turned on or off. The second switch is preferably, but not limited to, a switching device such as a relay module or a MOS transistor.

[0050] The signal acquisition unit is electrically connected to the ultrasonic scalpel transducer and is used to collect the voltage signal and current signal output by the ultrasonic scalpel transducer. The signal conversion module is electrically connected to the signal acquisition unit, receives the voltage signal and current signal, and converts them into corresponding square wave voltage signals and square wave current signals. The operational amplifier module is electrically connected to the signal conversion module, receives the square wave voltage signal and square wave current signal output by the signal conversion module, and obtains the impedance value of the load on the ultrasonic scalpel transducer and the phase difference between the output voltage and output current of the ultrasonic scalpel transducer based on the square wave voltage signal and square wave current signal. The operational amplifier module is electrically connected to the control module and sends the obtained impedance value and phase difference to the control module.

[0051] In this embodiment, the signal acquisition unit includes a voltage acquisition module and a current acquisition module. The voltage acquisition module is electrically connected to the ultrasonic scalpel transducer and the signal conversion module to acquire the voltage signal output by the ultrasonic scalpel transducer; the current acquisition module is electrically connected to the ultrasonic scalpel transducer and the signal conversion module to acquire the current signal output by the ultrasonic scalpel transducer.

[0052] The signal conversion module includes a first zero-crossing comparator and a second zero-crossing comparator. The operational amplifier module includes a first operational amplifier and a second operational amplifier.

[0053] In this embodiment, a first zero-crossing comparator is electrically connected to the voltage acquisition module and the first input terminal of the first operational amplifier of the operational amplifier module, respectively. The first zero-crossing comparator converts the voltage signal collected by the voltage acquisition module into a square wave voltage signal and sends it to the first operational amplifier. A second zero-crossing comparator is electrically connected to the current acquisition module and the second input terminal of the first operational amplifier of the operational amplifier module, respectively. The second zero-crossing comparator converts the current signal collected by the current acquisition module into a square wave current signal and sends it to the first operational amplifier. The first operational amplifier obtains the impedance value of the load on the ultrasonic scalpel transducer based on the received square wave voltage signal and square wave current signal. The output terminal of the first operational amplifier is connected to the signal input terminal of the control module, and the obtained impedance value is sent to the control module. The control module determines whether the ultrasonic scalpel device is unloaded based on the difference between the impedance value and the impedance threshold, where the impedance threshold is 60Ω. In this embodiment, the first operational amplifier is preferably, but not limited to, a divider.

[0054] The output end of the first zero-crossing comparator is also electrically connected to the first input end of the second operational amplifier of the operational amplifier module. The first zero-crossing comparator converts the voltage signal collected by the voltage acquisition module into a square wave voltage signal and sends it to the second operational amplifier. The output end of the second zero-crossing comparator is also electrically connected to the second input end of the second operational amplifier of the operational amplifier module. The second zero-crossing comparator converts the current signal collected by the current acquisition module into a square wave current signal and sends it to the second operational amplifier. The second operational amplifier obtains the phase difference between the output voltage and output current of the ultrasonic scalpel transducer based on the received square wave voltage signal and square wave current signal. The output end of the second operational amplifier is connected to the signal input end of the control module and sends the obtained phase difference to the control module. The control module determines whether the operating frequency of the ultrasonic scalpel transducer has reached a resonant state at this time based on the magnitude of the phase difference and the phase difference threshold, where the phase difference threshold value range is 0±10°. In this embodiment, the second operational amplifier is preferably, but not limited to, a subtractor.

[0055] The control module receives the impedance value and controls the first switch to be closed and the second switch to be open based on the impedance value being less than or equal to an impedance threshold, or receives the phase difference and controls the first switch to be open and the second switch to be closed based on the phase difference being less than or equal to a phase difference threshold.

[0056] In this embodiment, the control module is preferably, but not limited to, a chip or micro integrated circuit such as an MCU, a CPU, a microprocessor, or an FPGA. When starting operation, the control module outputs a driving signal to the driving module, and the driving module generates a driving signal to drive the ultrasonic scalpel transducer to operate.

[0057] When the ultrasonic knife device is powered on and self-tested (the power-on self-test requires no-load self-test), the control module determines whether the phase difference between the output voltage and output current of the ultrasonic knife transducer is less than or equal to the phase difference threshold. If so, the ultrasonic knife transducer enters resonance at this time; if not, the ultrasonic knife transducer does not enter resonance at this time.

[0058] If the ultrasonic knife transducer does not enter resonance and the impedance value is less than or equal to the impedance threshold, the control module outputs or maintains the output low level to control the first switch to be closed, and outputs or maintains the output high level to control the second switch to be opened. The input line of the driving module to the ultrasonic knife transducer is through the first switch and the voltage compensation module to the ultrasonic knife transducer, that is, the circuit between the driving module, the first switch, the voltage compensation module and the ultrasonic knife transducer is turned on and the circuit between the driving module and the ultrasonic knife transducer is turned off at the same time.

[0059] If the ultrasonic knife transducer enters resonance, the control module outputs a high level to control the first switch to open, and outputs a low level to control the second switch to close. The line from the driving module input to the ultrasonic knife transducer is adjusted to pass through the second switch to the ultrasonic knife transducer, that is, the circuit between the driving module, the second switch and the ultrasonic knife transducer is turned on and the circuit between the driving module, the first switch, the voltage compensation module and the ultrasonic knife transducer is turned off at the same time.

[0060] If the ultrasonic knife transducer does not enter resonance and the impedance value is greater than the impedance threshold, the control module continues to maintain the output high level to control the first switch to be open, and maintains the output low level to control the second switch to be closed, maintaining the circuit between the driving module and the ultrasonic knife transducer connected, that is, maintaining the circuit between the driving module, the second switch and the ultrasonic knife transducer conductive and at the same time maintaining the circuit between the driving module, the first switch, the voltage compensation module and the ultrasonic knife transducer disconnected.

[0061] In this way, switching between the two parallel switching circuits between the drive module and the ultrasonic scalpel transducer is achieved. In this embodiment, the voltage compensation module preferably, but not limited to, uses a non-inductive resistor. Other devices or modules that do not introduce or amplify interference may also be used. During resonance, the phase difference between the voltage and current of the ultrasonic scalpel transducer is zero. At the same time, the current of the ultrasonic scalpel transducer is controlled by constant current. The ultrasonic scalpel transducer current signal is clean. The voltage on the voltage compensation module is proportional to the ultrasonic scalpel transducer current. The voltage signal passing through the ultrasonic scalpel transducer is collected by amplifying the voltage through the voltage compensation module, reducing the impact of interference signals.

[0062] like Figure 6 As shown in the figure, the peak value of the collected ultrasonic knife transducer voltage signal is increased to 0.66V by increasing the compensation, which is Figure 3 and Figure 4 The voltage signal is doubled in one twelfth cycle of the sine wave, and is 0.43V, so that only two zero crossings appear in each 1 / 2 cycle, thereby eliminating the influence of interference signals.

[0063] Example 2

[0064] This embodiment provides an ultrasonic scalpel control system, which includes the voltage compensation circuit provided in the first embodiment. When the operating frequency of the ultrasonic scalpel transducer is not resonant and the ultrasonic scalpel impedance value is less than or equal to the impedance threshold, the control system realizes the switching of the circuit loop composed of the driving module and the ultrasonic scalpel transducer based on the voltage compensation circuit, wherein, Figure 5 As shown, the circuit loop consists of a driving module, a voltage compensation module, a first switch, a second switch and an ultrasonic scalpel transducer, and the first switch and the second switch are arranged in parallel between the driving module and the ultrasonic scalpel transducer.

[0065] Throughout this specification, references to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" mean that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations 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 any one or more embodiments or examples.

[0066] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and purpose of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A voltage compensation circuit, suitable for eliminating interference signals that may cause distortion of the working voltage signal of an ultrasonic scalpel device in a no-load state, wherein the ultrasonic scalpel device includes an ultrasonic scalpel transducer that outputs the working voltage, and is characterized in that: include: a driving module, electrically connected to the ultrasonic scalpel transducer, and configured to output the operating voltage to the ultrasonic scalpel transducer; a signal acquisition unit, electrically connected to the ultrasonic scalpel transducer, and configured to acquire the voltage signal and current signal output by the ultrasonic scalpel transducer; a signal conversion module, electrically connected to the signal acquisition unit, for receiving the voltage signal and the current signal, and converting them into corresponding square wave voltage signals and square wave current signals; an operational amplifier module, electrically connected to the signal conversion module, configured to receive the square wave voltage signal and the square wave current signal, and obtain an impedance value of a load on the ultrasonic scalpel transducer and a phase difference between an output voltage and an output current of the ultrasonic scalpel transducer based on the square wave voltage signal and the square wave current signal; A voltage compensation module is electrically connected between the ultrasonic scalpel transducer and the driving module, and is used to compensate for the working voltage output by the ultrasonic scalpel transducer; A first switch is electrically connected between the ultrasonic scalpel transducer and the voltage compensation module or between the driving module and the voltage compensation module; a second switch electrically connected between the ultrasonic scalpel transducer and the driving module, wherein the first switch and the second switch are connected in parallel between the ultrasonic scalpel transducer and the driving module; a control module electrically connected to the driving module, the operational amplifier module, the control end of the first switch, and the control end of the second switch; the control module receives the impedance value and controls the first switch to be closed and the second switch to be open based on the impedance value being less than or equal to an impedance threshold; or the control module receives the phase difference and controls the first switch to be open and the second switch to be closed based on the phase difference being less than or equal to a phase difference threshold.

2. The voltage compensation circuit according to claim 1, wherein: The signal acquisition unit includes: a voltage acquisition module, electrically connected between the ultrasonic scalpel transducer and the signal conversion module, and configured to acquire the voltage signal output by the ultrasonic scalpel transducer; The current acquisition module is electrically connected between the ultrasonic scalpel transducer and the signal conversion module, and is used to acquire the current signal output by the ultrasonic scalpel transducer.

3. The voltage compensation circuit according to claim 2, wherein: The signal conversion module includes: a first zero-crossing comparator, electrically connected to the voltage acquisition module and the operational amplifier module, respectively, to convert the voltage signal acquired by the voltage acquisition module into a square wave voltage signal and send the square wave voltage signal to the operational amplifier module; The second zero-crossing comparator is electrically connected to the current acquisition module and the operational amplifier module respectively, converts the current signal acquired by the current acquisition module into a square wave current signal, and sends the square wave current signal to the operational amplifier module.

4. The voltage compensation circuit according to claim 1 or 2, characterized in that: The operational amplifier module includes: a first operational amplifier, electrically connected to the output terminal of the signal conversion module, and configured to obtain the impedance value based on the square wave voltage signal and the square wave current signal; The second operational amplifier is electrically connected to the output end of the signal conversion module and obtains the phase difference based on the square wave voltage signal and the square wave current signal.

5. The voltage compensation circuit according to claim 3, wherein: The operational amplifier module includes: a first operational amplifier, wherein a first input terminal of the first operational amplifier is connected to the output terminal of the first zero-crossing comparator, a second input terminal of the first operational amplifier is connected to the output terminal of the second zero-crossing comparator, and an output terminal of the first operational amplifier is connected to a corresponding signal input terminal of the control module; The second operational amplifier has a first input connected to the output of the first zero-crossing comparator, a second input connected to the output of the second zero-crossing comparator, and an output connected to the corresponding signal input of the control module.

6. The voltage compensation circuit according to claim 1, wherein: The first switch and / or the second switch is a relay module or a MOS switch module.

7. The voltage compensation circuit according to claim 1, wherein: The voltage compensation module includes a non-inductive resistor.

8. An ultrasonic knife control system, characterized in that: The ultrasonic knife control system includes the voltage compensation circuit described in any one of claims 1-7.

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