CN117770912A - Ultrasonic simulation load calibration method of ultrasonic surgical instrument - Google Patents
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Abstract
The invention provides an ultrasonic simulation load calibration method of an ultrasonic surgical instrument, which relates to the technical field of ultrasonic surgical instruments and constructs an equivalent circuit of an ultrasonic vibrator load model of the ultrasonic surgical instrument; constructing an equivalent circuit of a transducer load model of the ultrasonic surgical instrument based on the equivalent circuit of the ultrasonic vibrator load model; constructing a calibration circuit, and connecting the calibration circuit with an equivalent circuit of an ultrasonic vibrator load model; and calculating the inductance and the filter capacitance of the calibration circuit required by the equivalent circuit of the calibration transducer load model, and obtaining the correction inductance and the correction filter capacitance of the calibration circuit according to the target inductance and the target filter capacitance of the calibration circuit.
Description
Technical Field
The invention relates to the technical field of ultrasonic surgical instruments, in particular to an ultrasonic simulation load calibration method of an ultrasonic surgical instrument.
Background
Ultrasonic surgical instruments are widely used in surgical operations, such as ultrasonic knife systems, for tissue cutting and coagulation hemostasis, and are implemented by converting an electrical signal into an ultrasonic signal by an ultrasonic transducer and transmitting the ultrasonic signal to a knife tip, so that high-frequency vibration is generated at the knife tip, proteins in tissue of the knife tip are denatured to form viscous coagulum, and a hemostasis seal is formed by the coagulum.
The ultrasonic knife can simultaneously cut and coagulate tissues by setting different output power gears, and can stop bleeding when cutting, so that the operation efficiency is improved. The high power gear may cut tissue more quickly and the low power gear may better coagulate tissue. The current with ultrasonic frequency in the host machine is conducted to the transducer, the transducer converts electric energy into longitudinal vibration mechanical energy of front-back vibration, the tail end of the cutter head vibrates at a certain frequency through the transmission and amplification of the cutter head, the heat generated by friction causes vaporization of water in tissue cells contacted with the cutter head, protein hydrogen bonds are broken, cell disintegration and recombination are carried out, and the tissue is cut after solidification; when cutting blood vessels, the cutter head is contacted with tissue protein, heat is generated through mechanical vibration, so that the collagen structure in the tissue is damaged, the protein is solidified, the blood vessels are further sealed, and the hemostatic purpose is achieved.
The existing problems are that the increase of impedance value of the ultrasonic transducer causes the increase of heating when the ultrasonic transducer vibrates, the increase of quality factor Q value, the decrease of frequency bandwidth of the ultrasonic transducer, the decrease of effective electromechanical coupling coefficient Keff value, and the like. The change of the performances can lead the amplitude of the terminal of the ultrasonic transducer to be gradually increased under the same current excitation after the ultrasonic transducer is used for a long time, so that the amplitude of the cutter head output to the ultrasonic surgical instrument is increased, the cutting hemostasis effect of the cutter head on tissues is further changed, and the performance stability of the ultrasonic surgical system is affected.
Disclosure of Invention
In order to solve the technical problems, the invention provides an ultrasonic simulation load calibration method of an ultrasonic surgical instrument, which comprises the following steps:
s1, constructing an equivalent circuit of an ultrasonic vibrator load model of an ultrasonic surgical instrument, and calculating the output impedance of the equivalent circuit of the ultrasonic vibrator load model;
s2, constructing an equivalent circuit of a transducer load model of the ultrasonic surgical instrument based on the equivalent circuit of the ultrasonic vibrator load model, and constructing a frequency equation of a piezoelectric transduction circuit of the transducer load model based on output impedance of the equivalent circuit of the ultrasonic vibrator load model;
s3, constructing a calibration circuit, connecting the calibration circuit with an equivalent circuit of the ultrasonic vibrator load model, and calculating inductance and filter capacitance of the equivalent circuit of the calibration transducer load model;
s4, calculating a target value of the output voltage of the driving part of the ultrasonic vibrator load model of the current ultrasonic surgical instrument, and calculating a target inductance and a target filter capacitance of the calibration circuit to obtain a correction inductance and a correction filter capacitance of the calibration circuit.
Further, in step S1, the equivalent circuit of the ultrasonic vibrator load model includes: a driving part, an adjusting part; output impedance Z of equivalent circuit of ultrasonic vibrator load model i The method comprises the following steps:
wherein R is i And X i Output resistance and output reactance of equivalent circuit of ultrasonic vibrator load model respectively, Z m To adjust the impedance of the part, n F For the electromechanical coupling coefficient of the driving portion, C F R is the cut-off capacitance of the driving part F In order to drive the dielectric loss resistance of the section,for the ultrasonic resonance frequency, j is the imaginary part, +.>Is the ultrasonic phase angle.
Further, in step S2, the equivalent circuit of the transducer load model includes a horn circuit, a front-end circuit, a back-end circuit, and a piezoelectric transducer circuit, and the input impedance Z of the horn circuit a Expressed as:
wherein: z is Z x For the impedance of the horn,for the impedance of the large end face of the amplitude transformer +.>For the length of the large end face of the amplitude transformer, k 1 Is the longitudinal wave number of the amplitude transformer.
Further, the impedance Z before and after the piezoelectric transduction circuit F And Z B Expressed as:
wherein Z is 2 And Z 4 Impedance of front-end circuit and back-end circuit, L 2 And L 4 The lengths k of the front-end circuit and the back-end circuit respectively 4 The wave number k of the longitudinal wave of the back-end circuit 2 The wave number of the longitudinal wave is the wave number of the front-end circuit.
Further, when the transducer is operated at a resonant frequency, the frequency equation of the piezoelectric transduction circuit is:
wherein k is 3 And k 4 Longitudinal wave number L of piezoelectric transduction circuit and back-end circuit respectively 3 For the length of the piezoelectric transduction circuit, Z 3 Impedance, Z, of the piezoelectric transduction circuit i The output impedance of the equivalent circuit of the ultrasonic vibrator load model.
Further, in step S3, the calibration circuit includes: the circuit comprises an inductor L, a boost diode VD, a circuit switching tube VT, a filter capacitor C and a calibration equivalent chip connected with the circuit switching tube VT; and connecting an input voltage port in the calibration circuit with two ends of a dielectric loss resistor of a driving part of an equivalent circuit of the ultrasonic vibrator load model, and receiving output voltage of the driving part of the equivalent circuit of the ultrasonic vibrator load model.
Further, in step S4, the circuit inductance L of the equivalent circuit of the calibration ultrasonic vibrator load model is:
wherein U is in Is the output voltage of the driving part of the equivalent circuit of the ultrasonic vibrator load model, D is the on duty ratio,for the current flowing through the calibration circuit inductance, f is the circuit switching tube switching frequency.
Further, the method is characterized in that the filter capacitor C of the equivalent circuit of the calibration ultrasonic vibrator load model is as follows:
wherein T is S For the switching period of the circuit switching tube VT,for the maximum value of the current flowing through the inductance of the calibration circuit,is a pulse frequency coefficient.
Further, in step S4, a target value U of the output voltage of the driving portion of the equivalent circuit according to the ultrasonic vibrator load model f Calculating a target inductance L of the calibration circuit T The method comprises the following steps:
wherein D is T The duty cycle is turned on for the target;
then the inductance is corrected；
Calculating a target filter capacitance C of a calibration circuit T The method comprises the following steps:
wherein,for the maximum value of the current through the inductance of the calibration circuit, < >>Pulse frequency coefficients;
then correct the filter capacitance。
Compared with the prior art, the invention has the following beneficial technical effects:
constructing an equivalent circuit of an ultrasonic vibrator load model of the ultrasonic surgical instrument, and calculating the output impedance of the equivalent circuit of the ultrasonic vibrator load model; constructing an equivalent circuit of a transducer load model of the ultrasonic surgical instrument based on the equivalent circuit of the ultrasonic vibrator load model, and constructing a frequency equation of a piezoelectric transduction circuit of the transducer load model based on the output impedance of the equivalent circuit of the ultrasonic vibrator load model; constructing a calibration circuit, connecting the calibration circuit with an equivalent circuit of an ultrasonic vibrator load model, and calculating inductance and filter capacitance of the equivalent circuit of the calibration transducer load model; and calculating a target value of the output voltage of a driving part of an ultrasonic vibrator load model of the current ultrasonic surgical instrument, and calculating a target inductance and a target filter capacitance of a calibration circuit to obtain a correction inductance and a correction filter capacitance of the calibration circuit. After correction of the filter capacitor and the inductor, the output impedance of the equivalent circuit of the ultrasonic vibrator load model and the frequency equation of the piezoelectric transduction circuit brought into the transducer load model are calculated again, and whether the left end and the right end of the frequency equation are matched is checked, so that the stability of the transducer load model is evaluated. Effectively solves the technical problem that the ultrasonic surgical tool can safely work when the ultrasonic load of the existing ultrasonic surgical instrument works.
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In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort to a person skilled in the art.
FIG. 1 is a flow chart of a method for ultrasonic simulated load calibration of an ultrasonic surgical instrument of the present invention;
fig. 2 is an equivalent circuit schematic diagram of an ultrasonic vibrator load model of the present invention;
FIG. 3 is a schematic diagram of an equivalent circuit of a transducer load model of the present invention;
fig. 4 is a schematic diagram of a calibration circuit according to the present invention.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
In the drawings of the specific embodiments of the present invention, in order to better and more clearly describe the working principle of each element in the system, the connection relationship of each part in the device is represented, but only the relative positional relationship between each element is clearly distinguished, and the limitations on the signal transmission direction, connection sequence and the structure size, dimension and shape of each part in the element or structure cannot be constructed.
The ultrasonic simulation load calibration structure comprises an equivalent circuit of an ultrasonic vibrator load model, an equivalent circuit of a transducer load model and a calibration circuit.
Referring to fig. 1, a flow chart of an ultrasonic simulated load calibration method of an ultrasonic surgical instrument according to the present invention includes the following steps:
s1, constructing an equivalent circuit of an ultrasonic vibrator load model of the ultrasonic surgical instrument, and calculating the output impedance of the equivalent circuit of the ultrasonic vibrator load model.
As shown in fig. 2, the equivalent circuit of the ultrasonic vibrator load model includes: a driving part and an adjusting part. The adjusting part comprises an impedance Z m The driving part includes a cut-off capacitor C F01 Dielectric loss resistor R F01 。
Calculating the output impedance Z of an equivalent circuit of an ultrasonic vibrator load model i :
Wherein R is i And X i Output resistance and output reactance of equivalent circuit of ultrasonic vibrator load model respectively, Z m To adjust the impedance of the part, n F For the electromechanical coupling coefficient of the driving portion, C F R is the cut-off capacitance of the driving part F In order to drive the dielectric loss resistance of the section,for the ultrasonic resonance frequency, j is the imaginary part, +.>Is the ultrasonic phase angle.
The electromechanical coupling coefficient is used for representing the parameter of the mutual coupling relation between the mechanical energy and the electric energy, reflects the size of the part of mechanical energy which can be extracted from the total energy of the equivalent circuit of the ultrasonic vibrator load model and provides driving, and is also an important factor for determining the bandwidth.
Coefficient of electromechanical coupling n F With maximum ultrasonic resonance frequencyAnd minimum ultrasonic resonance frequency->
The calculation relation between the two is as follows:
the electromechanical coupling coefficient N of the equivalent circuit of the ultrasonic vibrator load model calculated under N adjusting conditions of the adjusting part F The mean value is taken as an electromechanical conversion evaluation model V:
wherein n is F (I) Representing the calculated electromechanical coupling coefficient for the tuning case.
S2, constructing an equivalent circuit of a transducer load model of the ultrasonic surgical instrument based on the equivalent circuit of the ultrasonic vibrator load model, and constructing a frequency equation of a piezoelectric transduction circuit of the transducer load model based on output impedance of the equivalent circuit of the ultrasonic vibrator load model.
The resonance frequency of the transducer is affected by load, and an equivalent circuit of a transducer load model comprises an amplitude transformer circuit, a front-end circuit, a rear-end circuit and a piezoelectric transduction circuit, so that the transducer can work only when reaching a certain amplitude, and therefore, the front-end circuit is externally connected with an amplitude transformer, energy is concentrated on the small end face of the amplitude transformer, and the output amplitude is amplified. The back-end circuitry of the transducer may be considered empty, but the impedance of the front-end circuitry cannot be ignored.
The equivalent circuit of the ultrasonic vibrator load model is connected with the piezoelectric transduction circuit part of the equivalent circuit of the transducer load model, as shown in fig. 3.
Output impedance Z of amplitude transformer circuit a Expressed as:
wherein: z is Z x For the impedance of the horn,for the impedance of the large end face of the amplitude transformer +.>For the length of the large end face of the amplitude transformer, k 1 Is the longitudinal wave number of the amplitude transformer.
Impedance Z of amplitude transformer x The calculation formula of (2) is as follows:
in the method, in the process of the invention,for the impedance of the small end face of the amplitude transformer +.>Z is the length of the small end face of the amplitude transformer fl The reaction impedance of the transducer load to the transducer.
Impedance Z before and after the piezoelectric transduction circuit F And Z B Expressed as:
wherein the load Z of the front-end circuit FL =jZ fl The method comprises the steps of carrying out a first treatment on the surface of the Load Z of back-end circuit BL =0。
Wherein Z is 2 And Z 4 Impedance of front-end circuit and back-end circuit, L 2 And L 4 The lengths k of the front-end circuit and the back-end circuit respectively 4 The number of longitudinal waves for the back-end circuit.
When the transducer is operated at a resonant frequency, the frequency equation of the piezoelectric transduction circuit is:
wherein k is 3 And k 4 Longitudinal wave number of piezoelectric transduction circuit and back-end circuit respectively，L 3 For the length of the piezoelectric transduction circuit, Z 3 Impedance, Z, of the piezoelectric transduction circuit i The output impedance of the equivalent circuit of the ultrasonic vibrator load model.
S3, constructing a calibration circuit, connecting the calibration circuit with an equivalent circuit of the ultrasonic vibrator load model, and calculating inductance L and filter capacitance C of the equivalent circuit of the calibration transducer load model.
The calibration circuit is shown in fig. 4. The calibration circuit includes: the circuit comprises an inductor L, a boost diode VD, a circuit switching tube VT, a filter capacitor C and a calibration equivalent chip connected with the circuit switching tube VT. The input voltage U in the circuit will be calibrated in Dielectric loss resistor R of driving part of equivalent circuit of port and ultrasonic vibrator load model F01 And the two ends of the equivalent circuit of the ultrasonic vibrator load model are connected with each other to receive the output voltage of the driving part of the equivalent circuit of the ultrasonic vibrator load model.
The specific working process is as follows: after the calibration circuit is electrified, the alternating current power supply supplies the direct current voltage U dc The total filter capacitor C is charged by the calibrated circuit inductance L and the boost diode VD, and then the circuit switching tube VT is turned on or off at a certain switching frequency and duty ratio.
When the circuit switching tube VT is conducted, the calibration circuit inductance L starts to store energy, and when the circuit switching tube VT is cut off, the calibration circuit inductance L charges the total filter capacitance C through the boosting diode VD.
And calculating a calibration circuit inductance L and a filter capacitance C required for calibrating an equivalent circuit of the transducer load model.
When the circuit switching tube VT is conducted, the voltage U at two ends of the inductance L of the circuit is calibrated at the moment t L (t) is:
U L (t)=U in ；
current i flowing through inductance L of the calibration circuit at time t L (t) is:
i L (0) For the initial moment the current through the inductance L of the calibration circuit.
When t=t on =DT S At time t on For on time, D is on duty cycle, T S Is a switching period. From the above formula:
when the circuit switching tube VT is cut off, the voltage U at two ends of the inductance of the calibration circuit flows at the moment t L (t) is:
the current flowing through the calibration circuit inductance at this time is:
when t=t S When it is obtained by the following formula:
according to the working mode of the calibration circuit, the inductance L of the calibration circuit is calculated as follows:
wherein U is in Is the output voltage of the driving part of the equivalent circuit of the ultrasonic vibrator load model, D is the on duty ratio,for the current flowing through the calibration circuit inductance, f is the circuit switching tube switching frequency. The filter capacitance C of the calibration circuit is calculated as follows:
wherein T is S For the switching period of the circuit switching tube VT,for the maximum value of the current flowing through the inductance of the calibration circuit,is a pulse frequency coefficient.
It can be seen that the circuit inductance L and the filter capacitance C of the calibration circuit are both equal to the output voltage U of the driving part of the equivalent circuit of the ultrasonic vibrator load model in And (5) associating.
S4, calculating a target value of the output voltage of the driving part of the ultrasonic vibrator load model of the current ultrasonic surgical instrument, and calculating a target inductance and a target filter capacitance of the calibration circuit to obtain a correction inductance and a correction filter capacitance of the calibration circuit.
Determining a target value U of an output voltage of a driving part of an equivalent circuit of an ultrasonic vibrator load model of a current ultrasonic surgical instrument f 。
Wherein DeltaF represents an equivalent circuit output impedance margin value of the ultrasonic vibrator load model, F S Representing the resonant frequency value, C, of an equivalent circuit of a current ultrasonic vibrator load model 0 Representing the instantaneous capacitance value, a, at the off-capacitance of the driving part 1 Represents a balance factor, B 0 Representing the offset constant.
Representing the balance factor a 1 The calculation is carried out according to the following formula:
wherein Q represents an electric quantity value corresponding to a resonance frequency value of an equivalent circuit of the current ultrasonic vibrator load model, and M represents an equivalent mass value corresponding to a resonance frequency value of the equivalent circuit of the current ultrasonic vibrator load model.
Target value U of output voltage of driving part of equivalent circuit according to ultrasonic vibrator load model f Calculating a target for a calibration circuitInductance L T The method comprises the following steps:
wherein U is f Is a target value of the output voltage of the driving part of the equivalent circuit of the ultrasonic vibrator load model,d for the current flowing through the inductance of the calibration circuit T And f is the switching frequency of the switching tube of the circuit for the target on duty ratio.
Then the inductance is corrected
Calculating a target filter capacitance C of a calibration circuit T The method comprises the following steps:
wherein T is S For the switching period of the circuit switching tube VT,for the maximum value of the current flowing through the inductance of the calibration circuit,pulse frequency coefficient.
Then correct the filter capacitance。
After correction of the filter capacitor and the inductor, the output impedance of the equivalent circuit of the ultrasonic vibrator load model and the frequency equation of the piezoelectric transduction circuit brought into the transducer load model are calculated again, and whether the left end and the right end of the frequency equation are matched is checked, so that the stability of the transducer load model is evaluated.
By using the ultrasonic simulation load calibration method of the ultrasonic surgical instrument, when the ultrasonic surgical instrument leaves the factory, various parameters of an ultrasonic vibrator load circuit of the current ultrasonic surgical instrument are set. The ultrasonic vibrator load circuits of different ultrasonic surgical instruments correspond to different initial parameter values. Therefore, when the target circuit inductance and the circuit filter capacitance of the current ultrasonic surgical instrument are set, initial parameter values corresponding to voltages at two ends of the target calibration circuit inductance of the current ultrasonic transducer are calibrated. Further, the initial parameter values corresponding to the target circuit inductance and the circuit filter capacitance are correlated and stored in the current ultrasonic surgical instrument. The target circuit inductance and the circuit filter capacitance set by the current ultrasonic surgical instrument can be multiple, and each target amplitude value is marked in the current ultrasonic transducer to correspond to an initial driving current value.
In the above embodiments, it may be implemented in whole or in part by software, hardware, firmware, or any combination thereof. When implemented in software, may be implemented in whole or in part in the form of a computer program product. The computer program product includes one or more computer instructions. When loaded and executed on a computer, produces a flow or function in accordance with embodiments of the present application, in whole or in part. The computer may be a general purpose computer, a special purpose computer, a computer network, or other programmable apparatus. The computer instructions may be stored in or transmitted across a computer-readable storage medium. The computer readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server, data center, etc. that contains an integration of one or more available media. The usable medium may be a magnetic medium (e.g., a floppy disk, a hard disk, a magnetic tape), an optical medium (e.g., a DVD), or a semiconductor medium (e.g., a Solid State Disk (SSD)), or the like.
While the invention has been described with reference to certain preferred embodiments, it will be understood by those skilled in the art that various changes and substitutions of equivalents may be made and equivalents will be apparent to those skilled in the art without departing from the scope of the invention. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (9)
1. An ultrasonic simulated load calibration method of an ultrasonic surgical instrument, comprising the steps of:
s1, constructing an equivalent circuit of an ultrasonic vibrator load model of an ultrasonic surgical instrument, and calculating the output impedance of the equivalent circuit of the ultrasonic vibrator load model;
s2, constructing an equivalent circuit of a transducer load model of the ultrasonic surgical instrument based on the equivalent circuit of the ultrasonic vibrator load model, and constructing a frequency equation of a piezoelectric transduction circuit of the transducer load model based on output impedance of the equivalent circuit of the ultrasonic vibrator load model;
s3, constructing a calibration circuit, connecting the calibration circuit with an equivalent circuit of the ultrasonic vibrator load model, and calculating inductance and filter capacitance of the equivalent circuit of the calibration transducer load model;
s4, calculating a target value of the output voltage of the driving part of the ultrasonic vibrator load model of the current ultrasonic surgical instrument, and calculating a target inductance and a target filter capacitance of the calibration circuit to obtain a correction inductance and a correction filter capacitance of the calibration circuit.
2. The method according to claim 1, wherein in step S1, the equivalent circuit of the ultrasonic transducer load model includes: a driving part, an adjusting part; output impedance Z of equivalent circuit of ultrasonic vibrator load model i The method comprises the following steps:wherein R is i And X i Output resistance and output reactance of equivalent circuit of ultrasonic vibrator load model respectively, Z m To adjust the impedance of the part, n F For the electromechanical coupling coefficient of the driving portion, C F R is the cut-off capacitance of the driving part F For the dielectric loss resistance of the driving part, +.>For the ultrasonic resonance frequency, j is the imaginary part, +.>Is the ultrasonic phase angle.
3. The method of calibrating an ultrasonic simulation load according to claim 1, wherein in step S2, the equivalent circuit of the transducer load model includes a horn circuit, a front-end circuit, a back-end circuit, and a piezoelectric transducer circuit, and the input impedance Z of the horn circuit a Expressed as:wherein: z is Z x For impedance of the horn->For the impedance of the large end face of the amplitude transformer +.>For the length of the large end face of the amplitude transformer, k 1 Is the longitudinal wave number of the amplitude transformer.
4. The method of calibrating an ultrasonic analog load according to claim 3, wherein the impedance Z before and after the piezoelectric transduction circuit F And Z B Expressed as:
;
wherein Z is 2 And Z 4 Impedance of front-end circuit and back-end circuit, L 2 And L 4 The lengths k of the front-end circuit and the back-end circuit respectively 4 The wave number k of the longitudinal wave of the back-end circuit 2 The wave number of the longitudinal wave is the wave number of the front-end circuit.
5. The method of calibrating an ultrasonic analog load according to claim 4, wherein when the transducer is operated at a resonant frequency, the frequency equation of the piezoelectric transduction circuit is:
wherein k is 3 And k 4 Longitudinal wave number L of piezoelectric transduction circuit and back-end circuit respectively 3 For the length of the piezoelectric transduction circuit, Z 3 Impedance, Z, of the piezoelectric transduction circuit i The output impedance of the equivalent circuit of the ultrasonic vibrator load model.
6. The ultrasonic simulated load calibration method of claim 2, wherein in step S3, the calibration circuit comprises: the circuit comprises an inductor L, a boost diode VD, a circuit switching tube VT, a filter capacitor C and a calibration equivalent chip connected with the circuit switching tube VT; and connecting an input voltage port in the calibration circuit with two ends of a dielectric loss resistor of a driving part of an equivalent circuit of the ultrasonic vibrator load model, and receiving output voltage of the driving part of the equivalent circuit of the ultrasonic vibrator load model.
7. The method according to claim 6, wherein in step S4, the circuit inductance L of the equivalent circuit of the calibration ultrasonic transducer load model is:wherein U is in The output voltage of the driving part of the equivalent circuit of the ultrasonic vibrator load model is D is the on duty ratio, +.>For the current flowing through the calibration circuit inductance, f is the circuit switching tube switching frequency.
8. The ultrasonic simulated load calibration method of claim 7, wherein the ultrasound is calibratedThe filter capacitance C of the equivalent circuit of the oscillator load model is as follows:wherein T is S For the switching period of the circuit switching tube VT +.>For the maximum value of the current through the inductance of the calibration circuit, < >>Is a pulse frequency coefficient.
9. The ultrasonic wave analog load calibration method according to claim 8, wherein in step S4, the target value U of the output voltage of the driving portion of the equivalent circuit according to the ultrasonic vibrator load model f Calculating a target inductance L of the calibration circuit T The method comprises the following steps:wherein D is T The duty cycle is turned on for the target; correction of inductance +.>The method comprises the steps of carrying out a first treatment on the surface of the Calculating a target filter capacitance C of a calibration circuit T The method comprises the following steps: />Wherein, the->For the maximum value of the current flowing through the inductance of the calibration circuit,pulse frequency coefficients; correction of the filter capacitance +.>。
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