CN116037442A - Constant amplitude control method and device and ultrasonic transducer system - Google Patents
Constant amplitude control method and device and ultrasonic transducer system Download PDFInfo
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- B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
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Abstract
The application relates to a constant amplitude control method, a constant amplitude control device and an ultrasonic transducer system, comprising the following steps: acquiring an output voltage vector, an input current vector and a first phase difference between the output voltage vector and the input current vector of the ultrasonic transducer; acquiring a dynamic branch current vector of a resonant branch of the ultrasonic transducer according to the input current vector and a first phase difference; judging whether a dynamic branch current value is in a target current interval or not, wherein the dynamic branch current value is the length of a dynamic branch current vector; if not, adjusting the driving power of the ultrasonic transducer according to the relation between the dynamic branch current value and the target current interval so as to enable the dynamic branch current value to be in the target current interval. By controlling the dynamic branch current of the ultrasonic transducer, the constant amplitude control of the ultrasonic wave can be realized.
Description
Technical Field
The present disclosure relates to the field of ultrasound, and in particular, to a constant amplitude control method and apparatus, and an ultrasound transducer system.
Background
An ultrasonic transducer is a device for converting input electric power into mechanical power, and in the working process of ultrasonic equipment, the amplitude of a vibration system of the ultrasonic transducer is attenuated, and the working effect of the ultrasonic equipment is influenced by the amplitude attenuation. Therefore, there is a need to control the amplitude of the ultrasound system to be constant to improve the efficiency and stability of the ultrasound device.
Disclosure of Invention
Based on this, it is necessary to provide a constant amplitude control method, apparatus and ultrasonic transducer system for solving the problem of unstable ultrasonic amplitude in the prior art.
To achieve the above object, in a first aspect, the present application provides a constant amplitude control method for controlling an ultrasonic transducer, the method comprising:
acquiring an output voltage vector, an input current vector and a first phase difference between the output voltage vector and the input current vector of the ultrasonic transducer;
acquiring a dynamic branch current vector of a resonant branch of the ultrasonic transducer according to the input current vector and a first phase difference;
judging whether a dynamic branch current value is in a target current interval or not, wherein the dynamic branch current value is the length of a dynamic branch current vector;
if not, adjusting the driving power of the ultrasonic transducer according to the relation between the dynamic branch current value and the target current interval so as to enable the dynamic branch current value to be in the target current interval.
In one embodiment, the adjusting the driving power of the ultrasonic transducer according to the relation between the dynamic branch current value and the target current interval includes:
if the dynamic branch current value is smaller than the minimum value of the target current interval, the driving power is increased;
and if the dynamic branch current value is larger than the maximum value of the target current interval, reducing the driving power.
In one embodiment, the determining whether the dynamic branch current value is within the target current interval further includes:
acquiring a reference current and a current error interval;
and acquiring a target current interval according to the reference current and the current error interval.
In one embodiment, before adjusting the driving power of the ultrasonic transducer, the method further includes:
adjusting the driving frequency of the ultrasonic transducer according to the output voltage vector, the input current vector and the first phase difference so as to enable the driving frequency to be in a preset frequency interval;
the resonant branch circuit comprises a resonant inductor and a resonant capacitor, and the preset frequency interval is determined according to the values of the resonant inductor and the resonant capacitor.
In one embodiment, the adjusting the driving frequency of the ultrasonic transducer according to the output voltage vector, the input current vector, and the first phase difference includes:
acquiring a second phase difference between the dynamic branch current vector and the output voltage vector according to the output voltage vector, the input current vector and the first phase difference;
reducing the driving frequency when the second phase difference is less than 0;
when the second phase difference is greater than 0, the driving frequency is increased.
In one embodiment, the second phase difference is obtained using the following formula:
wherein ,
for the input current vector,/a>
For the output voltage vector, θ is the first phase difference, and Φ is the second phase difference.
In one embodiment, the preset frequency is a frequency at which the ultrasonic transducer is in a resonant state.
In a second aspect, the present application provides a constant amplitude control device for controlling an ultrasonic transducer, comprising:
the data acquisition module is used for acquiring an output voltage vector and an input current vector of the ultrasonic transducer;
a first phase difference acquisition module for acquiring a first phase difference between an output voltage vector and an input current vector of the ultrasonic transducer;
the branch current acquisition module is used for acquiring a dynamic branch current vector of a resonance branch of the ultrasonic transducer according to the input current vector and the first phase difference;
the judging module is used for judging whether the dynamic branch current value is in a target current interval or not, wherein the dynamic branch current value is the length of the dynamic branch current;
and the power adjusting module is used for adjusting the driving power of the ultrasonic transducer according to the relation between the dynamic branch current value and the target current interval if the dynamic branch current value is not the target current interval so that the dynamic branch current value is in the target current interval.
In a third aspect, the present application also provides an ultrasound transducer system comprising:
an ultrasonic transducer;
the driving plate is connected with the ultrasonic transducer and used for driving the ultrasonic transducer;
the sampling module is positioned on the driving plate and used for sampling an output voltage vector and an input current vector of the ultrasonic transducer;
a processor, located on the driving board, for obtaining a first phase difference between the output voltage vector and the input current vector in the form of digital signals; acquiring a dynamic branch current vector of a resonant branch of the ultrasonic transducer according to the input current vector and the first phase difference; judging whether a dynamic branch current value is in a target current interval or not, wherein the dynamic branch current value is the length of the dynamic branch current; and if not, adjusting the driving power of the driving plate for driving the ultrasonic transducer according to the relation between the dynamic branch current value and the target current interval so as to enable the dynamic branch value to be in the target current interval.
In one embodiment, the processor comprises:
the device comprises a signal processor, a phase discriminator, an effective value converter, a controller, a power amplifier and a frequency regulator, wherein the signal processor is respectively connected with the sampling module and the phase discriminator, the controller is respectively connected with the phase discriminator and the power amplifier, the effective value converter is respectively connected with the signal processor and the controller, and the frequency regulator is connected with the phase discriminator.
According to the constant amplitude control method, the current of the resonant branch is controlled, so that the current value of the dynamic branch can be stabilized in the target current interval, the purpose of maintaining the constant amplitude is achieved, and the constant amplitude control of ultrasonic waves is realized.
Drawings
In order to more clearly illustrate the technical solutions of embodiments or conventional techniques of the present application, the drawings required for the descriptions of the embodiments or conventional techniques will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person of ordinary skill in the art.
FIG. 1 is a flow chart of a constant amplitude control method according to an embodiment;
FIG. 2 is an equivalent circuit diagram of a piezoelectric transducer provided in an embodiment;
FIG. 3 is one of the vector relationships of the ultrasound transducer provided in one embodiment;
FIG. 4 is a second vector diagram of an ultrasound transducer provided in one embodiment;
FIG. 5 is a third vector relationship diagram of an ultrasound transducer provided in one embodiment;
FIG. 6 is a fourth diagram of a vector relationship of an ultrasound transducer provided in one embodiment;
FIG. 7 is a schematic diagram of a constant amplitude control device according to an embodiment;
fig. 8 is a schematic diagram of an ultrasound transducer system provided in an embodiment.
Reference numerals illustrate:
an ultrasonic transducer: 100; and a data acquisition module: 101; a first phase difference acquisition module: 102, a step of; branch current acquisition module: 103; and a judging module: 104; and a power adjusting module: 105; and (3) a driving plate: 106. Sampling module: 107; a signal processor: 108, a step of; phase discriminator: 109; an effective value converter: 110; and (3) a controller: 111; a power amplifier: 112; frequency adjuster: 113; output interface: 114.
Detailed Description
In order to facilitate an understanding of the present application, a more complete description of the present application will now be provided with reference to the relevant figures. Examples of the present application are given in the accompanying drawings. This application may, however, be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
It will be appreciated that the terms "first," "second," and the like, as used herein, may be used to describe a vector relationship, and that these terms are used only to distinguish a first vector relationship from another vector relationship. For example, the first phase difference may be referred to as a second phase difference, and similarly, the second phase difference may be referred to as a first phase difference, without departing from the scope of the present application. Both the first phase difference and the second phase difference are phase differences, but they are not the same phase difference.
The ultrasonic system comprises an ultrasonic generator, an ultrasonic transducer and other tool equipment, wherein the ultrasonic generator can convert power frequency alternating current into ultrasonic frequency oscillation for driving the ultrasonic transducer to work, the oscillation current of the ultrasonic frequency enters the ultrasonic transducer, and the ultrasonic transducer can convert the oscillation current into mechanical energy and then transmit the mechanical energy. The generator can not only make the ultrasonic transducer work normally, but also stabilize output power and track frequency. In the application of ultrasonic technology, the attenuation of the amplitude can influence the normal work, and under the same excitation voltage, the resonance frequency of the ultrasonic transducer can deviate due to the influence of factors such as temperature and load change, but if the frequency of a generator power supply signal is not changed, the system is detuned, so that the amplitude is reduced, and meanwhile, even if the frequency tracking is good, the additional dielectric loss is increased when the working condition is changed, and the amplitude still can be attenuated. It is desirable to control the amplitude of the ultrasound to improve the stability of the operation of the ultrasound device.
Referring to fig. 1, fig. 1 is a flow chart of a constant amplitude control method provided in an embodiment, the present application provides a constant amplitude control method for controlling an ultrasonic transducer, the method includes steps S100, S200, S300 and S400, and specifically includes the following steps:
step S100: an output voltage vector, an input current vector, and a first phase difference between the output voltage vector and the input current vector of the ultrasonic transducer are obtained.
Examples of the ultrasonic transducer that are commonly used include magnetostrictive transducers, piezoelectric transducers, electrostatic transducers, etc., and the present embodiment is described by taking a piezoelectric transducer as an example, which converts electric energy and acoustic energy to each other by using the piezoelectric effect of some single crystal materials and the electrostrictive effect of some polycrystalline materials. Specifically, FIG. 2 is an equivalent circuit diagram of a piezoelectric transducer provided in an embodiment in which the static and dynamic legs of FIG. 2 (a) are connected in parallel, the static leg including a capacitance C o The dynamic branch comprises an equivalent inductance L m Equivalent capacitance C m And equivalent resistance R m . When the voltage driving frequency of the piezoelectric transducer is equal to the mechanical resonance frequency f s At this time, as shown in FIG. 2 (b), the resonance inductance L of the dynamic branch m And a resonance capacitor C m The dynamic branch can be simplified into equivalent resistance R after series resonance m 。
Although the on-line measurement of the amplitude is very difficult, in view of the fact that the amplitude of the piezoelectric transducer is in direct proportion to the dynamic branch current, the dynamic branch current can be selected as a control parameter, the amplitude is controlled to be stable according to the change of the dynamic branch current value, the dynamic branch current cannot be measured directly when the piezoelectric transducer works, and therefore the relation between the input current and the output voltage and the dynamic branch current when the piezoelectric transducer works is required to be established, and the dynamic branch current is represented by the relation.
Therefore, when the piezoelectric transducer is powered on and initialized, an output voltage vector, an input current vector and a first phase difference between the output voltage vector and the input current vector of the piezoelectric transducer are required to be obtained, and the dynamic branch current vector is represented by a vector relation of the output voltage vector, the input current vector and the input current vector.
Step S200: and acquiring a dynamic branch current vector of a resonant branch of the ultrasonic transducer according to the input current vector and the first phase difference.
As shown in FIG. 3, to output a voltage vector
A vector relation graph is established by taking the current flowing through the static branch as the vertical axis, and the vertical axis can be expressed as jwC o />
Phase lead output voltage vector of static branch current>
90 deg.. From fig. 2 it can be seen that the dynamic branch current vector +.>
Can be obtained by the formula (1):
vectoring the dynamic branch current with the vector relation of formula (1)
In FIG. 3, it is shown that when the dynamic branch current vector +.>
And output voltage vector->
When parallel, namely the two are in phase, the resonant branches are pure resistive, the ultrasonic transducer works at a series resonant frequency point, and the graph can know that:
so in the resonance state according to the input current vector
The product of the cosine value of the first phase difference theta and the dynamic branch current vector +.>
Step S300: judging whether the dynamic branch current value is in a target current interval, wherein the dynamic branch current value is the length of a dynamic branch current vector.
It will be appreciated that in order to maintain the amplitude constant, it is necessary to control the current of the dynamic branch, and when the current value of the dynamic branch fluctuates, if the current value is still within the target current interval, it is indicated that the amplitude is controlled, and if the current value is not within the target current interval, it is indicated that the amplitude is not maintained constant, and step S400 is required to control the amplitude to be constant.
Step S400: and adjusting the driving power of the ultrasonic transducer according to the relation between the dynamic branch current value and the target current interval so as to enable the dynamic branch current value to be in the target current interval.
The amplitude can be regulated by changing the output power of the ultrasonic generator, namely the driving power of the ultrasonic transducer, so that the current value of the dynamic branch circuit is stably within a target current interval to keep the amplitude constant. When the constant amplitude control method of the above embodiment is applied to ultrasonic processing, the quality of ultrasonic processing can be ensured.
In the above example, by controlling the dynamic arm current of the resonant arm, the amplitude can be maintained constant, and the constant amplitude control of the ultrasonic wave can be realized.
In an embodiment, the step S400 of adjusting the driving power of the ultrasonic transducer according to the relation between the dynamic branch current value and the target current interval further includes the following steps: if the dynamic branch current value is smaller than the minimum value of the target current interval, driving power is increased; and if the dynamic branch current value is larger than the maximum value of the target current interval, reducing the driving power. The dynamic branch current value is maintained within the target current interval by varying the output of the ultrasonic generator to maintain the amplitude of the ultrasonic transducer constant.
In one embodiment, step S300 determines whether the dynamic branch current value is within the target current interval, and further includes the following steps: and acquiring a reference current and a current error interval, and acquiring a target current interval according to the reference current and the current error interval.
The reference current can be a current value corresponding to the ultrasonic transducer in a resonance state or a current value corresponding to the amplitude reaching an expected value, and when the dynamic branch current value is close to the reference current, the error of the current value and the dynamic branch current value is small, so that a current error interval is set to form a target current interval, and the amplitude of the ultrasonic transducer can be considered to reach the expected amplitude in the interval. The target current interval can be flexibly determined according to working conditions because the resonant frequency and the expected amplitude of the ultrasonic transducer can be changed in the working process.
In an embodiment, the step S400 further includes the following steps before adjusting the driving power of the ultrasonic transducer: adjusting the driving frequency of the ultrasonic transducer according to the output voltage vector, the input current vector and the first phase difference so that the driving frequency is in a preset frequency interval; the resonant branch comprises a resonant inductor and a resonant capacitor, and the preset frequency interval is determined according to the resonant inductor and the resonant capacitor.
It can be understood that the method of stabilizing the amplitude can perform frequency tracking first, so that the system is in resonance, then the driving power is adjusted, or the driving power can be directly changed without frequency modulation, but this cannot guarantee that the amplitude control is performed on the basis of successful frequency tracking. Since the impedance of the ultrasonic transducer is minimum and the output current is maximum at the resonance frequency point, the efficiency of converting the electric energy into the mechanical energy is highest, and one of the purposes of the amplitude control is to improve the efficiency of the ultrasonic device, the efficiency of maintaining the amplitude constant in the resonance state of the first method is higher than that of the second method. Therefore, in order to realize amplitude control, it is necessary to make the driving frequency close to the preset frequency on the basis of frequency tracking in the face of amplitude attenuation, and then to change the driving power. In one embodiment, the predetermined frequency is a frequency of the ultrasonic transducer in a resonant state.
According to the resonance state shown in FIG. 2 (b), the dynamic leg is reduced to an equivalent resistance, wherein the series resonance frequency f s Can be expressed as:
therefore, the preset frequency can be determined according to the above formula (3), and the preset frequency interval is determined according to the preset frequency interval, so that a small error range between the driving frequency and the preset frequency is allowed.
Specifically, referring to FIG. 3, when the dynamic branch current is in phase with the output voltage vector, there is
The resonant branch presents pure resistance; referring to fig. 4 and 5, there is +.>
The resonant branch presents an inductance; referring to fig. 6, when the dynamic branch current leads the output voltage vector, there is +.>
The resonant branches exhibit capacitive properties. I.e. when +.>
There is->
At this time->
and />
In phase, the ultrasonic transducers operate at the series resonant frequency point. When the ultrasonic generator drives the ultrasonic transducer, the current flow direction is defined to be positive direction, and the ultrasonic transducer is in the positive direction>
At this time there is and only a unique frequency point +.>
Satisfy the following requirements
Therefore, the phase-locked control cannot be out of lock, and the stability is superior to that of phase-locked control based on current-voltage zero phase. Therefore, whether the ultrasonic transducer is in a resonance state or not can be known through the vector relation of the output voltage vector, the input current vector and the first phase difference, and if not, the driving frequency of the ultrasonic transducer is adjusted so that the driving frequency is in a preset frequency interval.
In an embodiment, adjusting the driving frequency of the ultrasonic transducer according to the output voltage vector, the input current vector and the first phase difference includes the following steps: and obtaining a second phase difference between the dynamic branch current vector and the output voltage vector according to the output voltage vector, the input current vector and the first phase difference. When the second phase difference is smaller than 0, the driving frequency is reduced; when the second phase difference is greater than 0, increasing the driving frequency; when the second phase difference is equal to 0, the driving frequency is kept unchanged.
Specifically, in one embodiment, when the dynamic branch in fig. 3 is in a resonant state, the following formula is used to obtain the second phase difference Φ:
wherein ,
for inputting current vector>
For the output voltage vector, θ is the first phase difference, and φ is the second phase difference. The second phase difference is the dynamic branch current vector +.>
And output voltage vector->
Due to the phase difference of (2)
Therefore(s)>
Frequency tracking can be performed using the second phase difference phi as a feedback quantity: when phi is<0, the resonance branch presents the sensibility, the resonance frequency is smaller than the driving frequency at the moment, and the driving frequency of the ultrasonic transducer needs to be correspondingly reduced; when phi is>0, the resonance branch circuit presents capacity, the resonance frequency is larger than the driving frequency, and the driving frequency of the ultrasonic transducer needs to be correspondingly increased; when phi=0, the resonant branch presents pure resistance, the resonant frequency is equal to the driving frequency, and the driving frequency of the ultrasonic transducer is kept unchanged.
The driving frequency is adjusted according to the second phase difference, so that the ultrasonic transducer can stably work at a series resonance frequency point, and then the dynamic branch current value is controlled by adjusting the driving power so as to be in a target current interval, and the control of constant amplitude is realized.
The application provides a constant amplitude control device for controlling an ultrasonic transducer, comprising: the device comprises a data acquisition module 101, a first phase difference acquisition module 102, a branch current acquisition module 103, a judgment module 104 and a power adjustment module 105. Specifically, as shown in fig. 7, fig. 7 is a schematic diagram of a constant amplitude control device according to the present embodiment.
Specifically, the data acquisition module 101 is connected with the ultrasonic transducer 100, and is used for acquiring an output voltage vector and an input current vector of the ultrasonic transducer 100; the first phase difference acquisition module 102 is connected with the data acquisition module 101 and is used for acquiring a first phase difference between an output voltage vector and an input current vector of the ultrasonic transducer 100; the branch current acquisition module 103 is respectively connected with the data acquisition module 101 and the first phase difference acquisition module 102, and is used for acquiring a dynamic branch current vector of a resonance branch of the ultrasonic transducer 100 according to an input current vector and the first phase difference; the judging module 104 is connected with the branch current obtaining module 103, and is used for judging whether the dynamic branch current value is in the target current interval, wherein the dynamic branch current value is the length of the dynamic branch current; the power adjustment module 105 is connected to the judgment module 104 and the ultrasonic transducer 100, and is configured to adjust the driving power of the ultrasonic transducer 100 according to the relationship between the dynamic branch current value and the target current interval when the dynamic branch current value is not in the target current interval, so that the dynamic branch current value is in the target current interval.
The present application also provides an ultrasound transducer system comprising: an ultrasonic transducer 100 and a drive plate 106, wherein a sampling module 107 and a processor are located on the drive plate 106. Specifically, as shown in fig. 8, fig. 8 is a schematic diagram of an ultrasonic transducer system according to an embodiment.
Specifically, the driving board 106 is connected to the ultrasonic transducer 100, for driving the ultrasonic transducer 100 to operate. On the drive board 106, a sampling module 107, a processor and an output interface 114 are included, wherein the processor includes a signal processor 108, a phase discriminator 109, an effective value converter 110, a controller 111, a power amplifier 112 and a frequency adjustor 113. The sampling module 107 collects the current signal and the voltage signal through the sampling resistor, and the collected signals are transmitted to the signal processor 108, and the signal processor 108 comprises a zero-crossing comparator circuit and a filter.
In one embodiment, the zero-crossing comparator circuit converts the voltage-current signal into a square wave signal and sends the square wave signal to the phase discriminator 109. The phase discriminator 109 may employ a Field programmable gate array (Field-Programmable Gate Array, FPGA) as the phase detection chip, and the FPGA may employ the model EP4CE10F17C8 to obtain a digital value of the first phase difference between the current and the voltage, and send the digital value of the first phase difference and some other control signals (contact signals) to the controller 111 through the universal parallel port (The universal parallel port, UPP).
In other embodiments, the filter sends the voltage and current signals into the voltage and current signals that are band-pass filtered to the active value converter 110, so as to obtain voltage active values and current active values, and sends the voltage active values and current active values to the controller 111, where the active value converter 110 may be used with a model number AD8436. The controller 111 obtains the digital quantities of the voltage effective value and the current effective value through the self-contained analog-to-digital converter.
Specifically, the controller 111 may employ a digital signal processor (Digital Signal Processing, DSP), where the DSP may employ a model TMS320F28377D, and in the working process of the controller 111, a dynamic branch current value is obtained by using a built-in virtual reference feedback setting (VRFT) algorithm, and a relation between the dynamic branch current value and the target current interval is determined by using a fuzzy PID controller, and the determination result is transmitted to the power amplifier 112 to perform amplitude control, where the power amplifier 112 includes a multiplier, and the model that the multiplier may employ is AD633. Meanwhile, the acquired digital values of the voltage effective value and the current effective value and the digital value of the first phase difference are tracked based on the frequency of the vector method to obtain the relation between the driving frequency signal and the preset frequency interval, the result is transmitted to the phase discriminator 109 through the serial peripheral interface (Serial Peripheral Interface, SPI), the phase discriminator 109 codes to generate corresponding frequency control words, the corresponding frequency control words are transmitted to the frequency regulator 113 to carry out frequency control, so that the driving frequency of the ultrasonic transducer 100 is close to the resonant frequency, optionally, the frequency regulator 113 can adopt a direct digital frequency synthesizer (DirectDigitalSynthesizer, DDS), and the model of the DDS chip can be AD9833. After the amplitude control is completed, the electric signal is transmitted to the ultrasonic transducer 100 through the output interface 114.
It should be understood that, although the steps in the flowchart of fig. 1 are shown in sequence as indicated by the arrows, the steps are not necessarily performed in sequence as indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least a portion of the steps in fig. 1 may include a plurality of steps or stages, which are not necessarily performed at the same time, but may be performed at different times, and the order of the steps or stages is not necessarily sequential, but may be performed in rotation or alternatively with at least a portion of the steps or stages in other steps or other steps.
In the description of the present specification, reference to the terms "some embodiments," "other embodiments," "ideal embodiments," and the like, means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present application. In this specification, schematic descriptions of the above terms do not necessarily refer to the same embodiment or example.
The technical features of the above embodiments may be arbitrarily combined, and for brevity, all of the possible combinations of the technical features of the above embodiments are not described, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.
The above examples only represent a few embodiments of the present application, which are described in more detail and are not to be construed as limiting the scope of the claims. It should be noted that it would be apparent to those skilled in the art that various modifications and improvements could be made without departing from the spirit of the present application, which would be within the scope of the present application. Accordingly, the scope of protection of the present application is to be determined by the claims appended hereto.
Claims (10)
1. A method of constant amplitude control for controlling an ultrasonic transducer, the method comprising:
acquiring an output voltage vector, an input current vector and a first phase difference between the output voltage vector and the input current vector of the ultrasonic transducer;
acquiring a dynamic branch current vector of a resonant branch of the ultrasonic transducer according to the input current vector and a first phase difference;
judging whether a dynamic branch current value is in a target current interval or not, wherein the dynamic branch current value is the length of a dynamic branch current vector;
if not, adjusting the driving power of the ultrasonic transducer according to the relation between the dynamic branch current value and the target current interval so as to enable the dynamic branch current value to be in the target current interval.
2. The constant amplitude control method according to claim 1, wherein the adjusting the driving power of the ultrasonic transducer according to the relation between the dynamic branch current value and the target current interval includes:
if the dynamic branch current value is smaller than the minimum value of the target current interval, the driving power is increased;
and if the dynamic branch current value is larger than the maximum value of the target current interval, reducing the driving power.
3. The constant amplitude control method according to claim 1, wherein the determining whether the dynamic branch current value is within the target current interval further comprises:
acquiring a reference current and a current error interval;
and acquiring a target current interval according to the reference current and the current error interval.
4. A constant amplitude control method according to any one of claims 1 to 3, wherein before the adjusting the driving power of the ultrasonic transducer, further comprising:
adjusting the driving frequency of the ultrasonic transducer according to the output voltage vector, the input current vector and the first phase difference so as to enable the driving frequency to be in a preset frequency interval;
the resonant branch circuit comprises a resonant inductor and a resonant capacitor, and the preset frequency interval is determined according to the values of the resonant inductor and the resonant capacitor.
5. The constant amplitude control method according to claim 4, wherein the adjusting the driving frequency of the ultrasonic transducer according to the output voltage vector, the input current vector, and the first phase difference includes:
acquiring a second phase difference between the dynamic branch current vector and the output voltage vector according to the output voltage vector, the input current vector and the first phase difference;
reducing the driving frequency when the second phase difference is less than 0;
when the second phase difference is greater than 0, the driving frequency is increased.
6. The constant amplitude control method according to claim 5, wherein the second phase difference is obtained using the following formula:
wherein ,
for the input current vector,/a>
For the output voltage vector, θ is the first phase difference, and Φ is the second phase difference.
7. The constant amplitude control method according to claim 4, wherein the preset frequency is a frequency at which the ultrasonic transducer is in a resonance state.
8. A constant amplitude control device for controlling an ultrasonic transducer, comprising:
the data acquisition module is used for acquiring an output voltage vector and an input current vector of the ultrasonic transducer;
a first phase difference acquisition module for acquiring a first phase difference between an output voltage vector and an input current vector of the ultrasonic transducer;
the branch current acquisition module is used for acquiring a dynamic branch current vector of a resonance branch of the ultrasonic transducer according to the input current vector and the first phase difference;
the judging module is used for judging whether the dynamic branch current value is in a target current interval or not, wherein the dynamic branch current value is the length of the dynamic branch current;
and the power adjusting module is used for adjusting the driving power of the ultrasonic transducer according to the relation between the dynamic branch current value and the target current interval if the dynamic branch current value is not the target current interval so that the dynamic branch current value is in the target current interval.
9. An ultrasound transducer system, comprising:
an ultrasonic transducer;
the driving plate is connected with the ultrasonic transducer and used for driving the ultrasonic transducer;
the sampling module is positioned on the driving plate and used for sampling an output voltage vector and an input current vector of the ultrasonic transducer;
a processor, located on the driving board, for obtaining a first phase difference between the output voltage vector and the input current vector in the form of digital signals; acquiring a dynamic branch current vector of a resonant branch of the ultrasonic transducer according to the input current vector and the first phase difference; judging whether a dynamic branch current value is in a target current interval or not, wherein the dynamic branch current value is the length of the dynamic branch current; and if not, adjusting the driving power of the driving plate for driving the ultrasonic transducer according to the relation between the dynamic branch current value and the target current interval so as to enable the dynamic branch value to be in the target current interval.
10. The ultrasonic transducer system of claim 9, wherein the processor comprises:
the device comprises a signal processor, a phase discriminator, an effective value converter, a controller, a power amplifier and a frequency regulator, wherein the signal processor is respectively connected with the sampling module and the phase discriminator, the controller is respectively connected with the phase discriminator and the power amplifier, the effective value converter is respectively connected with the signal processor and the controller, and the frequency regulator is connected with the phase discriminator.
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| CN117982203A (en) * | 2024-04-02 | 2024-05-07 | 北京速迈医疗科技有限公司 | Amplitude control method and device for ultrasonic system, computer equipment and storage medium |
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| CN117982203A (en) * | 2024-04-02 | 2024-05-07 | 北京速迈医疗科技有限公司 | Amplitude control method and device for ultrasonic system, computer equipment and storage medium |
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