CN118282220A - Driving circuit of ultrasonic transducer, driving method of driving circuit and ultrasonic therapeutic instrument system - Google Patents

Abstract

The invention provides a driving circuit of an ultrasonic transducer, a driving method of the driving circuit and an ultrasonic therapeutic instrument system. In the driving circuit, the control module is used for controlling the power supply module, the switch module and the frequency selection module one by one, so that the frequency selection module can select signals matched with the expected output driving signal frequency from the received alternating current signals, the driving circuit can output driving signals with various different frequencies according to the setting, the driving circuit can be used for driving ultrasonic transducers with different frequencies, the problem that a plurality of sets of driving circuits are required to be correspondingly arranged for the ultrasonic transducers with various different frequencies in the prior art is solved, the complexity of ultrasonic equipment is simplified, and the cost can be reduced.

Description

Driving circuit of ultrasonic transducer, driving method of driving circuit and ultrasonic therapeutic instrument system

Technical Field

The invention relates to the technical field of image sensors, in particular to a driving circuit of an ultrasonic transducer, a driving method of the driving circuit and an ultrasonic therapeutic apparatus system.

Background

With the development of medical technology, the 21 st century surgery enters a non-invasive age from minimally invasive, and High-intensity focused ultrasound (High-INTENSITY FOCUSED ULTRASOUND, HIFU) has been widely used as an emerging non-invasive tumor treatment technology at home and abroad. In the medical field, the focused ultrasound technology has been widely used in recent years, and is mainly applied to non-invasive skin stretching and slimming and beautifying, and the like, specifically, a driving circuit of a high-frequency ultrasonic transducer is used for driving the focused ultrasonic transducer, the ultrasonic transducer generates ultrasonic waves, the ultrasonic waves are conducted to subcutaneous tissues through sound-transmitting liquid, and a target tissue is heated by using a thermal effect and a cavitation effect and acts on a preset depth position.

Currently, the transducers of a common ultrasonic therapeutic apparatus system are all single-frequency, and ultrasonic transducers (for example, transducers in a frequency range of 1MHz-20 MHz) with multiple working frequencies are required to be configured for target tissues with different depths. When driving the ultrasonic transducers with different frequencies, the driving circuits of the ultrasonic transducers with different frequencies need to be designed, so that a plurality of driving circuits need to be designed in a set of ultrasonic therapeutic apparatus system to be compatible with the ultrasonic transducers with a plurality of frequencies, which tends to cause higher complexity and higher cost of the ultrasonic equipment.

Disclosure of Invention

The invention aims to provide a driving circuit of an ultrasonic transducer, which can realize signal output of various frequencies, is compatible with the ultrasonic transducers of various different frequencies, simplifies the complexity of ultrasonic equipment and reduces the cost.

To this end, the present invention provides a driving circuit of an ultrasonic transducer, comprising: the device comprises a control module, a power module connected with the control module, a switch module and a frequency selection module. The control module is used for adjusting the voltage output by the power supply module according to the output power of the driving signal expected to be output; the control module is used for generating a control signal with a corresponding frequency according to the frequency of the driving signal which is expected to be output and applying the control signal to the switch module, and the switch module is used for receiving the voltage provided by the power supply module and generating an alternating current signal corresponding to the frequency of the control signal according to the control signal; the control module is also used for adjusting parameters of the frequency selection module according to the frequency of the driving signal expected to be output so as to adjust the resonance frequency of the frequency selection module to a preset frequency, and the frequency selection module is used for selecting a signal with the preset frequency from the received alternating current signal, and the preset frequency of the selected signal is matched with the frequency of the driving signal expected to be output by the driving circuit.

Optionally, the frequency selecting module includes at least two frequency selecting branches connected in parallel, and each frequency selecting branch is used for selecting a signal with a corresponding frequency from the received electric signals.

Optionally, the frequency selecting branch is an LC series resonant circuit, and includes an inductance element and a capacitance element connected in series, and the inductance element and the capacitance element are used for selecting out a signal with the same frequency as the resonant frequency of the LC series resonant circuit.

Optionally, the inductance element in the frequency-selective branch is further used for adjusting the voltage and the current of the electric signal on the loop to be in phase.

Optionally, each frequency selecting branch is provided with a switching element, so that the frequency selecting branch where the switching element is used for gating is used, and the frequency selecting branch which is gated selects a signal with a corresponding frequency.

Optionally, the switch module includes a first switch transistor, a second switch transistor and a first transformer, the first switch transistor and the second switch transistor are respectively connected to two ends of a primary winding of the first transformer, and drains of the first switch transistor and the second switch transistor are connected to the power module. The first switching transistor and the second switching transistor are alternately conducted to generate alternating current, the generated alternating current passes through a primary winding of the first transformer and generates a secondary signal on a secondary winding of the first transformer, and the secondary signal is transmitted to a back-end circuit containing a frequency selection module.

Optionally, the driving circuit further includes at least two adjustable freewheel modules, and each switching transistor is connected in parallel with one adjustable freewheel module.

Optionally, the adjustable freewheel module includes two at least electric capacity branch road that the parallel set up, all is connected with capacitive element in each electric capacity branch road, through enabling electric capacity branch road of different quantity, in order to change the capacitance value of freewheel electric capacity.

Optionally, the driving circuit further includes an impedance transformation module, and the impedance transformation module is connected between the frequency selection module and the output end of the driving circuit, and is used for adjusting the impedance of the output end of the driving circuit to the optimal load impedance.

Optionally, the impedance transformation module includes a second transformer, a primary winding of the second transformer is connected to a rear end of the frequency selection module, and a secondary winding of the second transformer is connected to an output end of the driving circuit.

Optionally, the driving circuit further includes an input module, and an output end of the input module is connected with the control module, and is configured to receive information of a driving signal expected to be output, and send the information to the control module.

Optionally, the driving circuit further includes a power amplification module, where the power amplification module is connected to an output end of the frequency selection module, and is configured to amplify power of the received signal to a target power.

The invention also provides a driving method of the ultrasonic transducer, which comprises the following steps: adjusting the output voltage of the power supply module according to the output power of the driving signal expected to be output; generating a control signal with a corresponding frequency according to the frequency of the driving signal which is expected to be output, and applying the control signal to a switch module, wherein the switch module receives the voltage provided by the power module and generates an alternating current signal corresponding to the frequency of the control signal according to the control signal; and adjusting parameters of the frequency selection module according to the frequency of the expected output driving signal so as to adjust the resonance frequency of the frequency selection module to a preset frequency, wherein the frequency selection module selects a signal with the preset frequency from the received alternating current signal, and the preset frequency of the selected signal is matched with the frequency of the expected output driving signal.

Optionally, the switch module includes a first switch transistor, a second switch transistor and a first transformer, the first switch transistor and the second switch transistor are respectively connected to two ends of a primary winding of the first transformer, and drains of the first switch transistor and the second switch transistor are connected to the power module. The first switching transistor and the second switching transistor are alternately conducted to generate alternating current, the generated alternating current passes through a primary winding of the first transformer and generates a secondary signal on a secondary winding of the first transformer, and the secondary signal is transmitted to a back-end circuit containing a frequency selection module.

Optionally, the first switching transistor and the second switching transistor are connected in parallel with an adjustable freewheel module, and a capacitance value of a freewheel capacitor of the adjustable freewheel module is correspondingly adjusted according to output power and frequency of a driving signal expected to be output.

Optionally, the frequency selecting module includes at least two frequency selecting branches connected in parallel, corresponding frequency selecting branches are gated according to the frequency of the driving signal expected to be output, and signals with preset frequency are selected through the gated frequency selecting branches.

Optionally, after the signal with the predetermined frequency is selected, the signal with the predetermined frequency is output to the circuit output end of the driving circuit through the impedance transformation module.

Optionally, after selecting a signal with a predetermined frequency, the selected signal is input to a power amplification module to amplify the power of the received signal to a target power.

Another object of the present invention is to provide an ultrasonic therapeutic apparatus system, which includes a driving circuit of the ultrasonic transducer and at least two ultrasonic transducers with different frequencies, wherein any ultrasonic transducer is connected to a circuit output end of the driving circuit, and the driving circuit is used for generating a driving signal with a corresponding frequency according to the connected ultrasonic transducer.

In the driving circuit of the ultrasonic transducer, the control module is utilized to adjust the output voltage of the power supply module according to the expected output driving signal, the switch module is controlled to generate the alternating current signal with the corresponding frequency, and meanwhile, the resonant frequency of the frequency selection module is adjusted to the preset frequency, so that the frequency selection module can select the signal matched with the expected output driving signal frequency from the received alternating current signal, the driving circuit can output a plurality of driving signals with different frequencies according to the setting, the driving circuit can be used for driving the ultrasonic transducer with different frequencies, the problem that a plurality of driving circuits are needed to be correspondingly arranged for the ultrasonic transducer with different frequencies in the prior art is solved, the complexity of ultrasonic equipment is simplified, and the cost is reduced.

In a further scheme, on the basis that the single driving circuit can realize multi-frequency output, a power amplification module in the driving circuit can be utilized to achieve the effect of power amplification, so that the problem that high-power output is difficult to realize is solved, and meanwhile, the output stability is ensured.

Drawings

Fig. 1 is a schematic diagram of a driving circuit of an ultrasonic transducer according to an embodiment of the present invention.

Fig. 2 is an equivalent circuit diagram of a driving circuit of an ultrasonic transducer in an embodiment of the present invention.

Fig. 3 is a schematic diagram of a driving circuit of another ultrasonic transducer according to an embodiment of the present invention.

Detailed Description

The driving circuit of the ultrasonic transducer, the driving method thereof and the ultrasonic therapeutic apparatus system provided by the invention are further described in detail below with reference to the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more apparent from the following description. It should be noted that the drawings are in a very simplified form and are all to a non-precise scale, merely for convenience and clarity in aiding in the description of embodiments of the invention.

Fig. 1 is a schematic diagram of a driving circuit of an ultrasonic transducer according to an embodiment of the present invention, and fig. 2 is an equivalent circuit diagram of the driving circuit of the ultrasonic transducer according to the first embodiment of the present invention. As shown in fig. 1 and 2, the driving circuit of the ultrasonic transducer provided in this embodiment includes: the device comprises a control module 700, a power module 100, a switch module 200 and a frequency selection module 500, wherein the power module 100, the switch module 200 and the frequency selection module 500 are connected with the control module 700. That is, the power module 100, the switching module 200, and the frequency selecting module 500 are controlled one by the control module 700 so that the driving circuit can finally generate a driving signal of a desired output according to the setting.

In this embodiment, the driving circuit of the ultrasonic transducer may further include an input module 800 for receiving information about a driving signal expected to be generated from a circuit Output of the driving circuit, for example, a power level and a frequency of the driving signal expected to be generated, and the like. Further, an output of the input module 800 is connected to the control module 700 to transmit the received information to the control module 700.

And the control module 700 is connected to the power module 100, and is configured to correspondingly adjust the voltage VDD output by the power module 100 according to the output power of the driving signal expected to be output. In this embodiment, the power module 100 may be specifically configured to output a dc voltage, and an inductance element may be further connected in series to an output end of the power module 100.

The control module 700 is connected to the switching module 200, and is configured to generate a control signal (e.g., a square wave control signal) having a corresponding frequency according to a frequency of a driving signal to be outputted, and apply the control signal to the switching module 200. The switch module 200 is connected to the power module 100, and is configured to receive a voltage provided by the power module 100, and generate an ac signal corresponding to a frequency of the control signal according to the control signal of the control module 700.

The control module 700 is further connected to the frequency selection module 500, and is configured to adjust parameters of the frequency selection module 500 according to a frequency of a driving signal expected to be output, so that a resonance frequency of the frequency selection module 500 is adjusted to a predetermined frequency. And, the frequency selecting module 500 is configured to select a signal with a predetermined frequency from the received ac signal, where the predetermined frequency of the selected signal matches the frequency of the driving signal expected to be Output by the driving circuit (i.e., the predetermined frequency of the selected signal matches the frequency of the driving signal expected to be Output by the driving circuit), and then the ultrasonic transducer 10 corresponding to the frequency may be connected to the Output end of the driving circuit.

In a specific example, referring to fig. 2, the frequency selection module 500 includes at least two frequency selection branches connected in parallel, where each frequency selection branch is used to select a signal with a corresponding frequency from the received electrical signals. At this time, the corresponding frequency-selective branch may be gated according to the frequency of the ultrasound transducer 10 that is specifically used, so as to generate a driving signal with a matched frequency. That is, in the driving circuit provided in this embodiment, by setting a plurality of frequency-selecting branches, driving signals with a plurality of different frequencies can be supplied to the Output end Output of the driving circuit, so as to adapt to the ultrasonic transducers 10 with a plurality of different frequencies. In the example shown in fig. 2, the frequency selection module 500 is illustrated as including three frequency selection branches, and at this time, driving signals with three different frequencies can be output by the driving circuit, so as to be suitable for the ultrasonic transducers 10 with three different frequencies. It should be appreciated that in other examples, four or more frequency selective branches may be provided in the frequency selective module 500, so that four or more different frequency signal outputs may be implemented, and thus at least four different frequency ultrasound transducers may be matched.

Further, the frequency selection branch is, for example, an LC series resonant circuit, which specifically includes an inductance element L1 and a capacitance element C1 connected in series, and the LC series resonant circuit has a small impedance for the same signal as the resonant frequency f _r, so that the same signal as the resonant frequency f _r can easily pass through, thereby playing a role in frequency selection. In specific application, parameters of the inductance element L1 and/or the capacitance element C1 in each frequency-selecting branch can be correspondingly adjusted according to different frequency-selecting branches, so that each frequency-selecting branch is respectively used for selecting signals with specific frequencies corresponding to each frequency-selecting branch.

It should be noted that the resonant frequency f _r of each frequency-selective branch may be specifically determined by the formula (1).

Wherein L is the inductance value of the inductance element L1;

C is the capacitance value of the capacitive element C1.

In addition, a switching element K1 is also provided in each frequency selecting branch, so that the frequency selecting branch where the switching element K1 is located is gated. Taking fig. 2 as an example, the switching element K1 in the first frequency-selecting branch is closed, so that the first frequency-selecting branch is gated for selecting the signal with the first frequency; when the second frequency selecting branch needs to be gated, the switching element K1 on the corresponding branch can be closed, so that the second frequency selecting branch is gated and used for selecting out a signal of a second frequency; or when the third frequency selecting branch needs to be gated, the switching element K1 on the third frequency selecting branch can be closed, so that the third frequency selecting branch is gated and used for selecting out the signal of the third frequency.

In a further scheme, the inductance element L1 in the frequency selection module 500 may be used to adjust the voltage and current of the electrical signal on the main loop to be in phase, so as to achieve the effect of phase adjustment. Specifically, the phase matching of the voltage and the current can be adjusted by adjusting the inductance value of the inductance element L1, and the inductance value L _x of the inductance element L1 can be determined by the following formula (2).

Wherein R is a load resistor connected with the circuit output end of the driving circuit, and f is the frequency of the driving signal.

It can be considered that the frequency selecting module 500 in this embodiment has both the phase adjusting function and the frequency selecting function, and the inductance element L1 also constitutes the phase adjusting module 400. Of course, in other embodiments, the phase adjustment module 400 may be additionally provided. The control module 700 may also be used to adjust the inductance value of the inductance element in the phase adjustment module 400, so as to adjust the voltage and current of the electrical signal on the main circuit to be in phase, thereby achieving the effect of phase adjustment.

With continued reference to fig. 2, the switch module 100 specifically includes a first switch transistor MOS-1, a second switch transistor MOS-2, and a first transformer T1, where the first switch transistor MOS-1 and the second switch transistor MOS-2 are respectively connected to two ends of a primary winding of the first transformer T1. The drains of the first switch transistor MOS-1 and the second switch transistor MOS-2 are connected to the power module 100, the sources of the first switch transistor MOS-1 and the second switch transistor MOS-2 are all grounded, and the gates of the first switch transistor MOS-1 and the second switch transistor MOS-2 receive a control signal to control the on or off of the first switch transistor MOS-1 or the second switch transistor MOS-2.

In this embodiment, the first switching transistor MOS-1 and the second switching transistor MOS-2 are alternately turned on to generate an alternating current with alternating directions in the loop of the switching module 100, the alternating current passes through the primary winding of the first transformer T1 and further generates a secondary signal at the secondary winding of the first transformer T1, one end of the secondary winding of the first transformer T1 is connected to the frequency selection module 500 to transmit the secondary signal generated by the secondary winding of the first transformer T1 to the frequency selection module 500, and the other end of the secondary winding of the first transformer T1 is grounded.

As described above, the first switching transistor MOS-1 and the second switching transistor MOS-2 are alternately turned on under the control of the control signal, and in an alternative example, the applied control signal may be embodied as a square wave control signal, and one of the switching transistors is turned on under the high frequency signal and the other switching transistor is turned on under the low frequency signal, so that the first switching transistor MOS-1 and the second switching transistor MOS-2 are alternately turned on.

With continued reference to fig. 1 and 2, in a specific example, each switching transistor is also connected in parallel with an adjustable freewheel module 300, which adjustable freewheel module 300 is used to achieve freewheel protection during alternating on and off of the switching transistor. In this embodiment, the adjustable freewheel module 300 specifically includes at least two capacitive branches arranged in parallel, and each capacitive branch is connected with a capacitive element C2. In a specific application, the parameters of the adjustable freewheel module 300 may be adjusted according to the Output power and frequency of the driving signal expected to be Output from the circuit Output of the driving circuit, for example, the number of enabled capacitive branches in the adjustable freewheel module 300 is adjusted to change the capacitance value of the freewheel capacitor of the adjustable freewheel module 300. The capacitance value C _p of the adjustable freewheel module 300 can be adjusted according to the frequency and the output power according to the following formula (3):

Wherein P _L is the output power of the driving signal;

f is the frequency of the driving signal;

VDD is the voltage output by the power supply module.

In this embodiment, a switching element K2 is disposed in at least one capacitive branch of the adjustable flywheel module 300, so that the capacitive branch where the switching element K2 is located is controlled to be connected in parallel with the switching transistor. In a specific application, the desired capacitance value C _p is determined according to equation (3) as described above, and the number of enabled capacitive branches and/or the capacitive branches that need to be enabled are selected based on the capacitance value C _p. Taking fig. 2 as an example, three parallel capacitor branches are disposed in the adjustable freewheel module 300, and switching elements K2 may be disposed on two of the capacitor branches, where only one capacitor branch may be selected to be connected in parallel according to a required capacitance value C _p; or the switching element K2 in one capacitor branch is selectively closed, so that the switching transistor is connected with two capacitor branches in parallel to increase the capacitance value; or the switching elements K2 in the two capacitive branches can be closed, so that the switching transistor is connected with three capacitive branches in parallel to achieve the required capacitance value.

Further, the control module 700 is further connected to the adjustable freewheel module 300, and is configured to adjust parameters of the adjustable freewheel module 300 according to an output power and a frequency of a driving signal that is expected to be output, for example, the number of capacitive branches that are enabled in the adjustable freewheel module 300 may be adjusted by the control module 700 to change a capacitance value of a freewheel capacitor of the adjustable freewheel module 300.

With continued reference to fig. 1 and 2, an impedance transformation module 600 is further disposed between the Output end of the circuit of the driving circuit and the frequency selection module 500, so as to adjust the impedance of the Output end of the circuit of the driving circuit to an optimal load impedance, thereby outputting the Output power of the Output end of the circuit of the driving circuit to the ultrasonic transducer 10 to the greatest extent, and improving the Output efficiency of the driving circuit (for example, the Output efficiency of the driving circuit may be greater than or equal to 70%).

In this embodiment, the impedance transformation module 600 includes a second transformer T2, a primary winding of the second transformer T2 is connected to the Output end of the frequency selection module 500, and a secondary winding of the second transformer T2 is connected to the circuit Output end Output of the driving circuit for connection with the ultrasonic transducer 10. Embodiments of the impedance transformation module 600 include, but are not limited to, an impedance transformation circuit configured using lumped parameter elements, a distributed parameter impedance transformation circuit, a transformer, and the like.

The driving method of generating the driving signal for the driving circuit of the ultrasonic transducer as described above is explained below. Specifically, the driving method includes: adjusting the output voltage of the power supply module according to the output power of the driving signal expected to be output; generating a control signal with a corresponding frequency according to the frequency of the driving signal which is expected to be output and applying the control signal to a switch module, wherein the switch module receives the voltage provided by the power module and generates an alternating current signal corresponding to the frequency of the control signal according to the control signal; and adjusting parameters of the frequency selection module according to the frequency of the expected output driving signal so as to adjust the resonance frequency of the frequency selection module to a preset frequency, wherein the frequency selection module selects a signal with the preset frequency from the received alternating current signal, and the preset frequency of the selected signal is matched with the frequency of the expected output driving signal.

That is, the driving circuit provided in this embodiment may correspondingly adjust the parameters of the driving circuit according to the driving signal expected to be generated, so that the adjusted driving circuit may generate the driving signal expected to be obtained, for example, the driving signal with the expected frequency may be obtained, so as to match with the ultrasonic transducer with the corresponding frequency. Thus, in one embodiment, an input module may be used to receive information about the drive signal that is expected to be generated, and a control module may be used to adjust parameters of the drive circuit. A driving method of the driving circuit in a specific example is described in detail below with reference to fig. 1 and 2.

First, the relevant information of the driving signal expected to be generated is input to the driving circuit through the input module 800, and includes, for example, the power of the driving signal, the frequency of the driving signal, and the like.

Next, the relevant information of the driving signal received by the input module 800 is sent to the control module 700, and the control module 700 adjusts the parameters of the driving circuit according to the relevant information of the received driving signal. The control module 700 may adjust the voltage VDD output by the power module 100 according to the output power of the driving signal expected to be output. The control module 700 may also generate a control signal (e.g., a square wave control signal) of a corresponding frequency according to the frequency of the driving signal that is desired to be output, and apply the control signal to the switching module 200. The control module 700 may also adjust parameters of the adjustable freewheel module 300 according to the output power and frequency of the driving signal expected to be output, for example, adjust the number of capacitive branches enabled in the adjustable freewheel module 300 to change the capacitance value of the freewheel capacitor of the adjustable freewheel module 300; in this embodiment, the switching element K2 in the capacitive branch is closed to enable the capacitive branch. And, the control module 700 may further adjust parameters of the frequency selection module 500 according to the frequency of the driving signal expected to be output, so as to adjust the resonant frequency of the frequency selection module 500 to a predetermined frequency; in this embodiment, the switching element K1 in the frequency-selective branch is closed to gate the frequency-selective branch where it is located, and the resonance frequency of the frequency-selective branch being gated satisfies the predetermined frequency. In addition, the control module 700 is further configured to adjust the inductance value of the inductance element in the phase adjustment module 400, so as to adjust the voltage and the current of the electrical signal on the main circuit to be in phase, thereby realizing the phase adjustment function; in this embodiment, a frequency selecting branch whose inductance element L1 meets the inductance requirement is specifically selected from the frequency selecting module 500, so as to achieve the purposes of phase adjustment and frequency selection at the same time.

Next, the power module 100 provides a corresponding voltage VDD, and it should be appreciated that the voltage VDD provided by the power module 100 is set correspondingly according to the output power of the driving signal that is expected to be output, and the power module 100 may specifically output a dc voltage. In this embodiment, an inductance element is further connected to the output end of the power module 100, and the voltage VDD generated by the power module 100 is output through the inductance element.

Next, the voltage VDD provided by the power module 100 is transmitted to the switch module 200, and the switch module 200 receives the voltage VDD and generates an ac signal corresponding to the frequency of the control signal according to the control signal of the control module 700, and the ac signal is further transmitted to the back-end circuit including the frequency selection module 500. Specifically, the control module 700 applies the generated control signal to the switch module 200 to control the on and off of the switch module 200, so that the corresponding ac signal can be transmitted to the back-end circuit through the switch module 200.

Referring specifically to fig. 2, in a specific example, the drains of the first switching transistor MOS-1 and the second switching transistor MOS-2 in the switching module 200 are both connected to the output terminal of the power module 100, and the gates of the first switching transistor MOS-1 and the second switching transistor MOS-2 receive a control signal from the control module 700, and the first switching transistor MOS-1 and the second switching transistor MOS-2 are controlled to be alternately turned on by the control signal, so that an alternating current is generated in the loop of the switching module 100. In this embodiment, the control signal from the control module 700 may be a square wave control signal, and one of the first switching transistor MOS-1 and the second switching transistor MOS-2 may be turned on under a high frequency signal, and the other may be turned on under a low frequency signal, so as to be turned on alternately under the control of the control signal.

In a specific example, the first switching transistor MOS-1 and the second switching transistor MOS-2 are further connected in parallel with the adjustable freewheel modules 300 one by one, so that during the alternating turn-on process of the first switching transistor MOS-1 and the second switching transistor MOS-2, each of the switching transistors can be freewheel protected by using each of the adjustable freewheel modules 300. And, the alternating current passes through the primary winding of the first transformer T1 and further generates a secondary signal at the secondary winding of the first transformer T1, which is transmitted to the back-end circuit including the frequency selection module 500.

Next, the frequency selection module 500 selects a signal of a predetermined frequency from the received electrical signal, the predetermined frequency of the selected signal corresponding to the frequency of the driving signal that is expected to be output. In a specific example, a frequency selecting branch with a predetermined frequency is selected from the frequency selecting module 500, and the resonance frequency of the selected frequency selecting branch is consistent with the predetermined frequency, so that a signal with the predetermined frequency can be selected and output when an electric signal is transmitted. In this embodiment, the control module 700 closes the switching element K1 of the frequency-selective branch to be gated according to the frequency of the driving signal expected to be output, so that the frequency-selective branch to be gated is connected into the main loop. In addition, the inductance element L1 in the frequency selection module 500 can also adjust the voltage and current of the electrical signal on the main circuit to be in phase, so as to achieve the function of phase adjustment.

Then, the selected signal with the predetermined frequency is transmitted to the impedance transformation module 600, and is outputted from the impedance transformation module 600 to the circuit Output terminal Output of the driving circuit. In this embodiment, the selected signal with the predetermined frequency is transmitted to the circuit Output terminal Output of the driving circuit through the second transformer T2. At this time, the circuit Output terminal Output of the driving circuit can Output a signal of a predetermined frequency to match the frequency of the ultrasonic transducer 10 to be connected.

In the driving circuit shown in fig. 1, the signal selected by the frequency selection module 300 is sent to the impedance transformation module 600, and is transmitted to the circuit Output terminal Output of the driving circuit through the impedance transformation module 600.

However, in other examples, for example, the driving circuit shown in fig. 3 is further connected to the power amplifier module 900 (the power amplifier module 900 is, for example, a switch-type broadband power amplifier module), and the power amplifier module 900 is connected to the output end of the frequency selection module 300, and may specifically be connected between the frequency selection module 300 and the impedance transformation module 600. In this way, the signal selected by the frequency selection module 300 is sent to the power amplification module 900, and the power amplification module 900 can amplify the amplitude of the input signal according to the designed multiplying power under the condition that the frequency and the waveform of the input signal are kept unchanged, so as to amplify the power of the input signal to the target power, and output the power to the impedance transformation module 600. Therefore, in the driving circuit shown in fig. 3, the frequency selecting module 500 and the power amplifying module 900 are simultaneously provided, so that high-power and multi-frequency output can be realized, for example, 10W to 200W of power output can be realized, and the output power and the output reliability are ensured.

In this embodiment, an ultrasonic therapeutic apparatus system is further provided, and as shown in fig. 1 and 3, the ultrasonic therapeutic apparatus system specifically includes the driving circuit of the ultrasonic transducer and at least two ultrasonic transducers 10 with different frequencies, where the frequency ranges corresponding to the at least two ultrasonic transducers 10 with different frequencies include, but are not limited to, 0.1MHz-100MHz. Any ultrasonic transducer 10 is connected to the Output end of the circuit of the driving circuit, and the driving circuit is used for generating a driving signal with a corresponding frequency according to the connected ultrasonic transducer 10. The ultrasonic transducer 10 is used to generate ultrasonic waves and conduct the ultrasonic waves to a predetermined depth of subcutaneous tissue through an acoustically transparent liquid so that the ultrasonic waves act on the predetermined depth position.

In the use process, the ultrasonic transducer with the corresponding frequency can be selected according to the expected reaching depth of the ultrasonic wave, wherein the higher the frequency of the ultrasonic transducer is, the shallower the conduction depth of the ultrasonic wave is generated, and the driving circuit is correspondingly adjusted according to the driving signal required by the selected ultrasonic transducer, so that the driving circuit after adjustment can generate the expected driving signal, for example, the driving signal with the expected frequency can be obtained, and the driving signal is matched with the ultrasonic transducer 10 with the corresponding frequency.

In addition, the driving circuit can be provided with the power amplification module 900 so as to achieve the function of power amplification, solve the problem that high-power output is difficult to realize, and ensure the output stability.

In summary, in the driving circuit of the ultrasonic transducer provided in this embodiment, the control module is utilized to adjust the output voltage of the power module according to the driving signal expected to be output, and control the switch module to generate the ac signal with the corresponding frequency, and adjust the resonant frequency of the frequency selection module to the predetermined frequency, so that the frequency selection module can select the signal matching with the frequency of the driving signal expected to be output from the received ac signal, so that the driving circuit can output driving signals with various different frequencies according to the setting. The ultrasonic transducer driving circuit can be used for driving ultrasonic transducers with various different frequencies when applied to an ultrasonic therapeutic instrument system, solves the problem that a plurality of sets of driving circuits are required to be correspondingly arranged aiming at the ultrasonic transducers with various different frequencies in the prior art, reduces the system complexity and the integration of the ultrasonic therapeutic instrument under the condition that the therapeutic effect of the ultrasonic therapeutic instrument is not affected, and simultaneously reduces the cost of equipment.

In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the system disclosed in the embodiment, the description is relatively simple because of corresponding to the method disclosed in the embodiment, and the relevant points refer to the description of the method section.

The above description is only illustrative of the preferred embodiments of the present invention and is not intended to limit the scope of the present invention, and any alterations and modifications made by those skilled in the art based on the above disclosure shall fall within the scope of the appended claims. Many possible variations and modifications of the disclosed technology can be made by anyone skilled in the art without departing from the scope of the technology, or the technology can be modified to be equivalent. Therefore, any simple modification, equivalent variation and modification of the above embodiments according to the technical substance of the present invention still fall within the scope of the technical solution of the present invention.

It should be further understood that the terms "first," "second," "third," and the like in this specification are used merely for distinguishing between various components, elements, steps, etc. in the specification and not for indicating a logical or sequential relationship between the various components, elements, steps, etc., unless otherwise indicated. It should also be recognized that, as used herein and in the appended claims, the singular forms "a," "an," and "the" include plural referents unless the context clearly dictates otherwise. For example, reference to "a step" or "an apparatus" means a reference to one or more steps or apparatuses, and may include sub-steps as well as sub-apparatuses. All conjunctions used should be understood in the broadest sense. And, the word "or" should be understood as having the definition of a logical "or" rather than a logical "exclusive or" unless the context clearly indicates the contrary. Furthermore, implementation of the methods and/or apparatus in embodiments of the invention may include performing selected tasks manually, automatically, or in combination.

Claims (19)

1. A driving circuit of an ultrasonic transducer, comprising: the device comprises a control module, a power module connected with the control module, a switch module and a frequency selection module; wherein,

The control module is used for adjusting the voltage output by the power supply module according to the output power of the driving signal expected to be output;

the control module is used for generating a control signal with a corresponding frequency according to the frequency of the driving signal which is expected to be output and applying the control signal to the switch module, and the switch module is used for receiving the voltage provided by the power supply module and generating an alternating current signal corresponding to the frequency of the control signal according to the control signal;

The control module is also used for adjusting parameters of the frequency selection module according to the frequency of the driving signal expected to be output so as to adjust the resonance frequency of the frequency selection module to a preset frequency, and the frequency selection module is used for selecting a signal with the preset frequency from the received alternating current signal, and the preset frequency of the selected signal is matched with the frequency of the driving signal expected to be output by the driving circuit.

2. The driving circuit of an ultrasonic transducer according to claim 1, wherein the frequency selection module comprises at least two frequency selection branches connected in parallel, each frequency selection branch being configured to select a signal of a corresponding frequency from the received electrical signals.

3. The driving circuit of an ultrasonic transducer according to claim 2, wherein the frequency selection branch is an LC series resonant circuit including an inductance element and a capacitance element connected in series for selecting out a signal having the same frequency as the resonance frequency of the LC series resonant circuit.

4. A driving circuit for an ultrasound transducer according to claim 3, wherein the inductive element in the frequency selective branch is further adapted to adjust the voltage and current of the electrical signal on the loop to be in phase.

5. The driving circuit of an ultrasonic transducer according to claim 2, wherein a switching element is provided in each frequency-selecting branch, so that the frequency-selecting branch where the switching element is used to gate is used to make the frequency-selecting branch gate select a signal with a corresponding frequency.

6. The driving circuit of the ultrasonic transducer according to claim 1, wherein the switching module includes a first switching transistor, a second switching transistor, and a first transformer, the first switching transistor and the second switching transistor being connected to both ends of a primary winding of the first transformer, respectively, drains of the first switching transistor and the second switching transistor being connected to the power supply module;

The first switching transistor and the second switching transistor are alternately conducted to generate alternating current, the generated alternating current passes through a primary winding of the first transformer and generates a secondary signal on a secondary winding of the first transformer, and the secondary signal is transmitted to a back-end circuit containing a frequency selection module.

7. A driving circuit for an ultrasound transducer according to claim 6, further comprising at least two adjustable freewheel modules, each switching transistor being connected in parallel with one adjustable freewheel module.

8. The driving circuit of an ultrasonic transducer of claim 7, wherein the adjustable freewheel module comprises at least two capacitive branches arranged in parallel, each capacitive branch having a capacitive element connected therein, the freewheel capacitance being varied in capacitance by enabling a different number of capacitive branches.

9. The drive circuit of an ultrasonic transducer of claim 1, further comprising an impedance transformation module coupled between the frequency selection module and the drive circuit output for adjusting the impedance of the drive circuit output to an optimal load impedance.

10. The driving circuit of an ultrasonic transducer of claim 9, wherein the impedance transformation module comprises a second transformer, a primary winding of the second transformer being connected to a back end of the frequency selection module, and a secondary winding of the second transformer being connected to a driving circuit output.

11. The driving circuit of an ultrasonic transducer according to claim 1, further comprising an input module, wherein an output end of the input module is connected to the control module, and is configured to receive information of a driving signal that is expected to be output, and send the information to the control module.

12. The driving circuit of an ultrasonic transducer according to any one of claims 1 to 11, further comprising a power amplification module connected to an output end of the frequency selection module, for amplifying the received signal to a target power.

13. A driving method of an ultrasonic transducer, comprising:

Adjusting the output voltage of the power supply module according to the output power of the driving signal expected to be output;

Generating a control signal with a corresponding frequency according to the frequency of the driving signal which is expected to be output, and applying the control signal to a switch module, wherein the switch module receives the voltage provided by the power module and generates an alternating current signal corresponding to the frequency of the control signal according to the control signal; and

And adjusting parameters of a frequency selection module according to the frequency of the expected output driving signal so as to adjust the resonance frequency of the frequency selection module to a preset frequency, wherein the frequency selection module selects a signal with the preset frequency from the received alternating current signal, and the preset frequency of the selected signal is matched with the frequency of the expected output driving signal.

14. The driving method of an ultrasonic transducer according to claim 13, wherein the switching module includes a first switching transistor, a second switching transistor, and a first transformer, the first switching transistor and the second switching transistor being connected to both ends of a primary winding of the first transformer, respectively, drains of the first switching transistor and the second switching transistor being connected to the power module;

The first switching transistor and the second switching transistor are alternately conducted to generate alternating current, the generated alternating current passes through a primary winding of the first transformer and generates a secondary signal on a secondary winding of the first transformer, and the secondary signal is transmitted to a back-end circuit containing a frequency selection module.

15. The driving method of an ultrasonic transducer according to claim 14, wherein the first switching transistor and the second switching transistor are connected in parallel with an adjustable freewheel module, and a capacitance value of a freewheel capacitor of the adjustable freewheel module is correspondingly adjusted according to an output power and a frequency of a driving signal expected to be output.

16. The driving method of an ultrasonic transducer according to claim 13, wherein the frequency selection module includes at least two frequency selection branches connected in parallel, the corresponding frequency selection branches are gated according to the frequency of the driving signal expected to be output, and a signal of a predetermined frequency is selected by the gated frequency selection branches.

17. The driving method of an ultrasonic transducer according to claim 13, wherein after the signal of the predetermined frequency is selected, the signal of the predetermined frequency is output to a circuit output terminal of the driving circuit via the impedance conversion module.

18. A method of driving an ultrasonic transducer according to any one of claims 13 to 17, wherein after a signal of a predetermined frequency is selected, the selected signal is input to a power amplification module to power-amplify the received signal to a target power.

19. An ultrasonic therapeutic apparatus system comprising a drive circuit of an ultrasonic transducer according to any one of claims 1-12 and at least two transducers of different frequencies, any one transducer being connected to a circuit output of the drive circuit, the drive circuit being arranged to generate a drive signal of a corresponding frequency in dependence on the connected transducer.