CN115999883B - Self-focusing phased array ultrasonic transducer driving system capable of providing high voltage - Google Patents
Self-focusing phased array ultrasonic transducer driving system capable of providing high voltage Download PDFInfo
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- CN115999883B CN115999883B CN202211688010.XA CN202211688010A CN115999883B CN 115999883 B CN115999883 B CN 115999883B CN 202211688010 A CN202211688010 A CN 202211688010A CN 115999883 B CN115999883 B CN 115999883B
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Abstract
The invention discloses a self-focusing phased array ultrasonic transducer driving system capable of providing high voltage, wherein a PC (personal computer) is used for providing focusing excitation parameters of all channels of a phased array ultrasonic transducer, a focusing delay module is used for calculating focusing delay data of all channels according to the focusing excitation parameters of all channels, PWM (pulse-width modulation) waves which correspond to all channels and carry the focusing delay data are output by combining the focusing delay data of all channels, the PWM waves which correspond to all channels and carry the focusing delay data are input into corresponding fundamental frequency control circuits through an I/O (input/output) channel expansion module, and each LC (inductance/output) oscillation circuit oscillates a direct current source signal into a sine wave signal according to fundamental frequency signals output by the fundamental frequency control circuits and outputs the sine wave signal to a phase-locked loop module, and the sine wave signal is phase-locked by the phase-locked loop module based on reference signals and then output to corresponding channels of the phased array ultrasonic transducer. Therefore, the sine wave excited by the excitation system reaches each array element of the concave array ultrasonic transducer at the same time, and the method is suitable for a concave array ultrasonic transducer system.
Description
Technical Field
The invention relates to the technical field of ultrasonic transducers, in particular to a self-focusing phased array ultrasonic transducer driving system capable of providing high voltage.
Background
The brain science nerve regulation technology is a biomedical engineering technology which utilizes implantable or non-implantable technology and adopts physical stimulation or medicine means to change the activity of a nervous system so as to improve the disease symptoms of patients and improve the life quality. Besides the application of medicines, the technology of nerve stimulation based on the action of physical factors such as electricity, magnetism, light, sound and the like plays an important role in basic research of neuroscience and clinical diagnosis and treatment of nerve and mental diseases. The magneto-acoustic coupling electrical stimulation (TMAS) is used as one of the nerve regulation and control technologies, based on magneto-acoustic coupling effect, the biological tissue contains conductive particles, vibration is generated under the action of ultrasonic waves, and the vibration particles are subjected to the action of Lorentz force in a magnetic field to generate a coupling electric field. The technology utilizes the high focusing characteristic of ultrasound to realize high spatial resolution noninvasive electrical stimulation under the condition of loading magnetic field, and the method has the advantages of good safety, no permanent side effect, adjustability, noninvasive or minimally invasive performance, reversibility of stimulation and great development prospect in brain function research. Studies have shown that TMAS complexation still reaches the electrical stimulation threshold for neural activity. How to enhance the TMAS electric field and further enhance the compound stimulation is a key issue.
Conventional ultrasonic transducer excitation source systems use high-voltage high-frequency square waves for excitation, but the high-frequency components of the square waves can cause heating and damage to the ultrasonic transducer. In addition, since the power amplifier based on PWM amplification generally needs to set a dead zone, the waveform precision is low, the actual excitation waveform is not a standard square wave or a standard sine wave, and a pulse signal with an accurate frequency cannot be transmitted. And the excitation system in the related art is not applicable to the concave array ultrasonic transducer.
Disclosure of Invention
The invention provides a self-focusing phased array ultrasonic transducer driving system capable of providing high voltage, which solves the problem that excitation signals in the related art cannot reach ultrasonic transducer array elements at the same time.
To achieve the above object, an embodiment of the present invention provides a self-focusing phased array ultrasonic transducer driving system capable of providing high voltage, including:
the system comprises a PC, a focusing delay module, an I/O channel expansion module, a plurality of fundamental frequency control circuits, a plurality of LC oscillating circuits and a plurality of phase-locked loop modules, wherein the fundamental frequency control circuits, the LC oscillating circuits and the phase-locked loop modules are in one-to-one correspondence;
The PC is used for providing focusing excitation parameters of all channels of the phased array ultrasonic transducer, the focusing delay module is used for calculating focusing delay data of all channels according to the focusing excitation parameters of all channels, outputting PWM waves carrying the focusing delay data corresponding to all channels by combining the focusing delay data of all channels, inputting the PWM waves carrying the focusing delay data corresponding to all channels into corresponding fundamental frequency control circuits through the I/O channel expansion module, oscillating a direct current source signal into a sine wave signal according to fundamental frequency signals output by the fundamental frequency control circuits, outputting the sine wave signal to the phase-locked loop module, and outputting the sine wave signal to corresponding channels of the phased array ultrasonic transducer after phase-locking based on reference signals through the phase-locked loop module; the focusing delay module is connected with the phase-locked loop module and is used for outputting the reference signal and the enabling signal to the phase-locked loop module.
Optionally, the baseband control circuit includes:
The optical coupler circuit unit is connected with the I/O channel expansion module, the output end of the optical coupler circuit unit is connected with the input end of the NAND gate circuit unit, the output end of the crystal oscillator unit is connected with the input end of the NAND gate circuit unit, the output end of the NAND gate circuit unit is connected with the MOS tube control unit, and the MOS tube is in an open state or a closed state according to the level signal output by the MOS tube control unit so as to provide a fundamental frequency signal for the LC oscillating circuit.
Optionally, the optocoupler circuit unit includes: the PWM circuit comprises a first power chip, an optical coupler and a first capacitor, wherein a first end and a second end of the optical coupler are respectively input with PWM wave signals, a third end of the optical coupler is connected with an output end of the first power chip, a fourth end of the optical coupler is grounded, a fifth end of the optical coupler is connected with a NAND gate circuit unit, the first power chip supplies power for the optical coupler, an output end of the first power chip is also connected with one end of the first capacitor, and the other end of the first capacitor is grounded.
Optionally, the nand gate unit includes: the first input end of the first NAND gate is connected with one end of the first resistor, the other end of the first resistor is connected with a second power supply, the first input end of the first NAND gate is connected with the second input end, and the second input end of the first NAND gate is connected with the fifth end of the optical coupler;
the output end of the first NAND gate is connected with the first input end of the second NAND gate, the second input end of the second NAND gate is connected with the crystal oscillator unit, the output end of the second NAND gate is respectively connected with the first input end and the second input end of a third NAND gate, and the output end of the third NAND gate is connected with the input end of the MOS tube control unit.
Optionally, the crystal oscillator unit includes: the second capacitor and one end of the third capacitor are grounded, the other end of the second capacitor is connected with one end of the fourth capacitor, the other end of the third capacitor is connected with the other end of the fourth capacitor, the other end of the fourth capacitor is also connected with one end of the second resistor, the other end of the second resistor is connected with the output end of the fourth NAND gate, one end of the fourth capacitor is also connected with the first input end and the second input end of the fourth NAND gate, one end of the third resistor is connected with the first input end and the second input end of the fourth NAND gate, the other end of the third resistor is connected with the output end of the fourth NAND gate, and the output end of the fourth NAND gate is connected with the second input end of the second NAND gate.
Optionally, the MOS transistor control unit includes: the MOS transistor comprises a fourth resistor, a fifth resistor, a sixth resistor, a fifth capacitor, a sixth capacitor, a first switch tube and a second switch tube, wherein one end of the fourth resistor and one end of the fifth capacitor which are connected in parallel are connected with the output end of the third NAND gate, the other end of the fourth resistor and one end of the fifth capacitor are connected with the control end of the second switch tube respectively, the source electrode of the first switch tube is connected with one end of a third power supply and one end of the sixth capacitor, the other end of the sixth capacitor is grounded, the drain electrode of the first switch tube is connected with the drain electrode of the second switch tube and one end of the fifth resistor respectively, the source electrode of the second switch tube is grounded, the other end of the fifth resistor is connected with the control end of the MOS tube and one end of the sixth resistor respectively, and the other end of the sixth resistor is grounded.
Optionally, the LC oscillating circuit includes a first LC oscillating circuit unit and a second LC oscillating circuit unit, an input end of the first LC oscillating circuit unit is used for inputting the dc source signal, an output end of the first LC oscillating circuit is connected with an input end of the second LC oscillating circuit and a second end of the MOS tube, a third end of the MOS tube is grounded, and an output end of the second LC oscillating circuit is connected with a corresponding array element of the phased array ultrasonic transducer.
Optionally, the first LC oscillating circuit unit includes: the circuit comprises a Wheatstone bridge, a seventh capacitor, an eighth capacitor, a ninth capacitor, a seventh resistor, a first inductor and a first diode, wherein a first end and a second end of the Wheatstone bridge are respectively connected with the direct current source signal, a fourth end of the Wheatstone bridge is grounded, a third end of the Wheatstone bridge is respectively connected with one end of the seventh capacitor and one end of the seventh resistor, the other end of the seventh capacitor is grounded, the other end of the seventh resistor is respectively connected with a fourth power supply and a cathode of the first diode, an anode of the first diode is connected with a first end of the first inductor, a second end of the first inductor is grounded, a third end of the first inductor is respectively connected with one end of the eighth capacitor and one end of the seventh capacitor, the other end of the eighth capacitor is grounded, a fourth end of the first inductor is respectively connected with one end of the ninth capacitor and one end of the second oscillating circuit unit, and the other end of the ninth capacitor is grounded.
Optionally, the second LC oscillating circuit unit includes: the ultrasonic transducer comprises a tenth capacitor, an eleventh capacitor, a twelfth capacitor, a thirteenth capacitor, a fourteenth capacitor, an eighth resistor, a ninth resistor, a tenth resistor, a second inductor and a second diode, wherein one end of the tenth capacitor is connected with one end of the ninth capacitor, the other end of the tenth capacitor is connected with the first end of the second inductor, the second end of the second inductor is connected with an anode of the second diode, a cathode of the second diode is connected with one end of the eighth resistor, the other end of the eighth resistor is connected with one end of the ninth resistor and one end of the eleventh capacitor which are connected in parallel, the other end of the ninth resistor and the other end of the eleventh capacitor are connected with the third end of the second inductor, the fourth end of the second inductor is connected with one end of the twelfth capacitor respectively, the other end of the twelfth capacitor is connected with one end of the thirteenth capacitor, the other end of the thirteenth capacitor is grounded, the other end of the thirteenth capacitor is connected with one end of the tenth resistor, the first end of the tenth resistor is grounded, the other end of the eleventh resistor is connected with the other end of the eleventh capacitor, the other end of the eleventh capacitor is connected with the fourteenth capacitor in parallel, the other end of the eleventh capacitor is connected with the fourteenth capacitor, and the other end of the fourteenth capacitor is connected with the fourteenth capacitor.
Optionally, each phase-locked loop module includes: the focusing delay module is respectively connected with the reference signal unit and the phase-locked loop control unit, the LC oscillating circuit is connected with the phase-locked loop control unit, and the phase-locked loop control unit is respectively connected with the filtering unit and the reference signal unit;
the reference signal unit is used for receiving a reference signal input by the focusing delay module; the phase-locked loop control unit selects an excitation signal output by the LC oscillating circuit with the same phase as the reference signal based on the reference signal, controls the filtering unit to filter and outputs the excitation signal to a corresponding channel of the phased array ultrasonic transducer.
In summary, the self-focusing phased array ultrasonic transducer driving system capable of providing high voltage according to the embodiment of the invention includes: the system comprises a PC, a focusing delay module, an I/O channel expansion module, a plurality of fundamental frequency control circuits, a plurality of LC oscillating circuits and a plurality of phase-locked loop modules, wherein the fundamental frequency control circuits, the LC oscillating circuits and the phase-locked loop modules are in one-to-one correspondence; the PC is used for providing focusing excitation parameters of all channels of the phased array ultrasonic transducer, the focusing delay module is used for calculating focusing delay data of all channels according to the focusing excitation parameters of all channels, outputting PWM waves which correspond to all channels and carry the focusing delay data by combining the focusing delay data of all channels, the PWM waves which correspond to all channels and carry the focusing delay data are input into corresponding fundamental frequency control circuits through the I/O channel expansion module, each LC oscillating circuit oscillates a direct current source signal into a sine wave signal according to fundamental frequency signals output by the fundamental frequency control circuit and outputs the sine wave signal to the phase-locked loop module, and the phase-locked PWM waves are output to corresponding channels of the phased array ultrasonic transducer after phase-locked by the phase-locked loop module based on reference signals; the focusing delay module is connected with the phase-locked loop module and is used for outputting a reference signal and an enabling signal to the phase-locked loop module. Therefore, the sine wave with high amplitude is excited by the excitation system, has zero high-frequency component, can reduce load heating and piezoelectric ceramic vibration loss, can obviously prolong the service life of the phased array ultrasonic transducer, can reach each array element of the concave array ultrasonic transducer at the same time by the arrangement of the phase-locked loop module, and is suitable for a concave array ultrasonic transducer system.
It should be understood that the description in this section is not intended to identify key or critical features of the embodiments of the invention or to delineate the scope of the invention. Other features of the present invention will become apparent from the description that follows.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a block schematic diagram of a self-focusing phased array ultrasound transducer drive system for providing high voltage in accordance with an embodiment of the present invention;
FIG. 2 is a block schematic diagram of a self-focusing phased array ultrasound transducer drive system that can provide high voltage in accordance with one embodiment of the present invention;
FIG. 3 is a schematic diagram of a fundamental frequency control circuit and an LC oscillating circuit in a drive system for a self-focusing phased array ultrasonic transducer capable of providing high voltage in accordance with an embodiment of the present invention;
FIG. 4 is a block schematic diagram of a self-focusing phased array ultrasound transducer drive system that can provide high voltage in accordance with one embodiment of the present invention;
FIG. 5 is a schematic circuit diagram of a phase lock module in a self-focusing phased array ultrasonic transducer drive system that can provide high voltage in accordance with an embodiment of the present invention;
Fig. 6 is a schematic circuit diagram of a self-focusing phased array ultrasound transducer drive system that can provide high voltage in accordance with one embodiment of the present invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
Fig. 1 is a block schematic diagram of a self-focusing phased array ultrasonic transducer driving system capable of providing high voltage according to an embodiment of the present invention. As shown in fig. 1, the phased array ultrasonic transducer excitation system 100 for providing high voltage includes:
The system comprises a PC 101, a focusing delay module 102, an I/O channel expansion module 103, a plurality of fundamental frequency control circuits, a plurality of LC oscillating circuits and a plurality of phase-locked loop modules, wherein the fundamental frequency control circuits 104 are in one-to-one correspondence with the LC oscillating circuits 105 and the phase-locked loop modules 40;
The PC 101 is configured to provide focusing excitation parameters of each channel of the phased array ultrasonic transducer 106, the focusing delay module 102 is configured to calculate focusing delay data of each channel according to the focusing excitation parameters of each channel, output PWM waves carrying the focusing delay data corresponding to each channel in combination with the focusing delay data of each channel, input the PWM waves carrying the focusing delay data corresponding to each channel to the corresponding fundamental frequency control circuit 104 through the I/O channel expansion module 103, and each LC oscillating circuit 105 oscillates a dc source signal into a sine wave signal according to a fundamental frequency signal output by the fundamental frequency control circuit 104, and output the sine wave signal to the phase-locked loop module 40, and phase-locked the phase-locked signal based on a reference signal by the phase-locked loop module 40 and output the phase-locked signal to the corresponding channel of the phased array ultrasonic transducer 106. The focusing delay module 102 is connected to the phase-locked loop module 40, and is configured to output a reference signal and an enable signal to the phase-locked loop module 40.
It can be understood that focusing excitation parameters of each channel of the phased array ultrasonic transducer, such as the number of excitation array elements, the width of the array elements, the distance between the array elements, the excitation of ultrasonic propagation medium and the like, are controlled by a PC (personal computer) by using the q_prime software. The focusing delay module 102 calculates focusing delay data of each channel according to focusing excitation parameters of each channel, and outputs PWM waves carrying the focusing delay data corresponding to each channel in combination with the focusing delay data of each channel, and the PWM waves corresponding to each channel control the corresponding fundamental frequency control circuit 104 to output fundamental frequency signals to the corresponding LC oscillating circuit 105, so that the LC oscillating circuit 105 oscillates direct current source signals into sine wave signals based on the fundamental frequency signals, and outputs the sine wave signals to the corresponding phase-locked loop module 40, and the sine wave signals are phase-locked by the phase-locked loop module 40 based on reference signals and then output to the corresponding channels of the phased array ultrasonic transducer 106 for each array element in the concave array phased array ultrasonic transducer 106 to work. The excitation system can excite a sine wave with high amplitude, and as the sine wave has zero high-frequency component, load heating and piezoelectric ceramic vibration loss can be reduced, and the service life of the phased array ultrasonic transducer can be remarkably prolonged. And, the phase-locked loop module 40 may be configured such that a plurality of sine wave signals reach each array element in the concave array phased array ultrasonic transducer 106 at the same time, so as to be used by each array element in the concave array phased array ultrasonic transducer 106.
It should be noted that, the PWM wave output by the focusing delay module 102 only controls the fundamental frequency control circuit 104 to output a fundamental frequency signal to the corresponding LC oscillating circuit 105, so that the LC oscillating circuit 105 oscillates the dc source signal into a sine wave signal. The PWM wave not only carries focusing delay information, but also can control the duty ratio of excitation pulse of the phased array ultrasonic transducer, the main frequency of the module can reach 250MHz, the maximum support of delay with 4ns precision, and the excitation waveform can be accurately modulated. The focusing delay module 102 is an STM32H743 focusing delay module.
Optionally, as shown in fig. 2, the baseband control circuit 104 includes:
The input end of the optocoupler circuit unit 107 is connected with the I/O channel expansion module 103, the output end of the optocoupler circuit unit 107 is connected with the input end of the NAND circuit unit 108, the output end of the crystal oscillator unit 109 is connected with the input end of the NAND circuit unit 108, the output end of the NAND circuit unit 108 is connected with the MOS tube control unit 110, the MOS tube 111 is in an open state or a closed state according to a level signal output by the MOS tube control unit 110 so as to provide a fundamental frequency signal for the LC oscillating circuit 105, and the output end out of the LC oscillating circuit 105 is connected with the phase-locked loop module 40.
It should be noted that, after the crystal oscillator unit 109 receives the external pressure, an electrical signal, that is, a fundamental frequency signal, is generated, the optocoupler circuit unit 107 receives the PWM signal output by the focusing delay module 102, the optocoupler in the optocoupler circuit unit 107 is in an on state or an off state according to the level signal of the PWM wave, that is, a state of "0" or "1" is input to the input end of the nand gate circuit unit 108, the state of the fundamental frequency signal "1" generated by the crystal oscillator unit 109 is input to the input end of the nand gate circuit unit 108, and since the output end of the nand gate circuit unit 108 is connected with the control end of the MOS transistor control unit 110, the signal output by the optocoupler circuit unit 107 controlled by the PWM signal and the fundamental frequency signal generated by the crystal oscillator unit 109 output a control signal to the control end of the MOS transistor control unit 110 after passing through the nand gate circuit unit 108, and when the MOS transistor is turned on, the fundamental frequency signal is provided for the LC oscillation circuit 105.
The structure and principles of the circuit are described in detail below.
Optionally, as shown in fig. 3, the optocoupler circuit unit 107 includes: the first power chip 112, the optocoupler 113 and the first capacitor C1, the first end 1 and the second end 2 of the optocoupler 113 are respectively input with PWM wave signals, the third end 3 of the optocoupler 113 is connected with the output end of the first power chip 112, the fourth end 4 of the optocoupler 113 is grounded, the fifth end 5 of the optocoupler 113 is connected with the NAND gate circuit unit 108, the first power chip 112 supplies power to the optocoupler 113, the output end of the first power chip 112 is also connected with one end of the first capacitor C1, and the other end of the first capacitor C1 is grounded.
The first power chip 112 supplies power to the optocoupler 113, when the first end 1 of the optocoupler 113 inputs a high level and the second end 2 inputs a low level, the optocoupler 113 is turned on, whereas when the first end 1 of the optocoupler 113 inputs a low level and the second end 2 inputs a high level, the optocoupler 113 is turned off. That is, the PWM waves input from the first terminal 1 and the second terminal 2 of the optocoupler 113 are different by half a period. When the optocoupler 113 is turned on, the fifth terminal 5 of the optocoupler 113 outputs a high level, and when the optocoupler 113 is turned off, the fifth terminal 5 of the optocoupler 113 outputs a low level.
According to one embodiment of the present invention, as shown in fig. 3, the nand gate circuit unit 108 includes: the first input end 1 of the first NAND gate 114 is connected with one end of the first resistor R1, the other end of the first resistor R1 is connected with the second power supply VDD2, the first input end 1 of the first NAND gate 114 is connected with the second input end 2, and the second input end 2 of the first NAND gate 114 is connected with the fifth end 5 of the optocoupler 113;
The output end 3 of the first nand gate 114 is connected to the first input end 1 of the second nand gate 115, the second input end 2 of the second nand gate 115 is connected to the crystal oscillator unit 109, the output end 3 of the second nand gate 115 is connected to the first input end 1 and the second input end 2 of the third nand gate 116, respectively, and the output end 3 of the third nand gate 116 is connected to the input end of the MOS transistor control unit 110.
When the optocoupler 113 is turned on, the fifth end 5 of the optocoupler 113 outputs a high level, and is further input to the second input end 2 of the first nand gate 114, the first input end 1 and the second input end 2 of the first nand gate 114 are both high levels, and the output end 3 of the first nand gate 114 outputs a low level. When the optocoupler 113 is disconnected, the fifth end 5 of the optocoupler 113 outputs a low level, and is further input to the second input end 2 of the first nand gate 114, the first input end 1 and the second input end 2 of the first nand gate 114 are both at a low level, and the output end 3 of the first nand gate 114 outputs a high level.
When the output 3 of the first nand gate 114 is at a high level, i.e. the first input 1 of the second nand gate 115 is at a high level, if the second input 2 of the second nand gate 115 is at a low level, then the output 3 of the second nand gate 115 is at a high level; if the second input 2 of the second NAND gate 115 is high, the output 3 of the second NAND gate 115 is low.
When the output 3 of the first nand gate 114 is at low level, i.e. the first input 1 of the second nand gate 115 is at low level, if the second input 2 of the second nand gate 115 is at low level, the output 3 of the second nand gate 115 is at high level; if the second input 2 of the second NAND gate 115 is high, the output 3 of the second NAND gate 115 is high.
When the output 3 of the second nand gate 115 is at the high level, the first input 1 and the second input 2 of the third nand gate 116 are both at the high level, and the output 3 of the third nand gate 116 is at the low level. When the output 3 of the second nand gate 115 is at low level, the first input 1 and the second input 2 of the third nand gate 116 are both at low level, and the output 3 of the third nand gate 116 is at high level.
Alternatively, as shown in fig. 3, the crystal oscillator unit 109 includes: the fourth NAND gate 117, the second resistor R2, the third resistor R3, the second capacitor C2, the third capacitor C3 and the fourth capacitor C4, the second capacitor C2 and one end of the third capacitor C3 are all grounded, the other end of the second capacitor C2 is connected with one end of the fourth capacitor C4, the other end of the third capacitor C3 is connected with the other end of the fourth capacitor C4, the other end of the fourth capacitor C4 is also connected with one end of the second resistor R2, the other end of the second resistor R2 is also connected with the output end 3 of the fourth NAND gate 117, one end of the fourth capacitor C4 is also connected with the first input end 1 and the second input end 2 of the fourth NAND gate 117, one end of the third resistor R3 is connected with the first input end 1 and the second input end 2 of the fourth NAND gate 117, the other end of the third resistor R3 is connected with the output end 3 of the fourth NAND gate 117, and the output end of the fourth NAND gate 117 is connected with the second input end 2 of the second NAND gate 115.
When the second capacitor C2, the third capacitor C3 and the fourth capacitor C4 are charged, the first input terminal 1 and the second input terminal 2 of the fourth nand gate 117 are both at the high level, and the output terminal 3 is at the low level; when the second capacitor C2, the third capacitor C3 and the fourth capacitor C4 are fully charged, the first input terminal 1 and the second input terminal 2 of the fourth nand gate 117 are both at low level, and the output terminal 3 is at high level; when the second capacitor C2, the third capacitor C3 and the fourth capacitor C4 are fully charged and discharged, the first input terminal 1 and the second input terminal 2 of the fourth nand gate 117 are both at the high level, and the output terminal 3 is at the low level.
Optionally, as shown in fig. 3, the MOS transistor control unit 110 includes: the fourth resistor R4, the fifth resistor R5, the sixth resistor R6, the fifth capacitor C5, the sixth capacitor C6, the first switching tube Q1 and the second switching tube Q2, wherein one end of the fourth resistor R4 and the fifth capacitor C5 which are connected in parallel is connected with the output end 3 of the third NAND gate 116, the other end of the fourth resistor R4 and the fifth capacitor C5 is respectively connected with the control ends of the first switching tube Q1 and the second switching tube Q2, the source electrode of the first switching tube Q1 is connected with one end of the third power supply VDD3 and one end of the sixth capacitor C6, the other end of the sixth capacitor C6 is grounded, the drain electrode of the first switching tube Q1 is respectively connected with the drain electrode of the second switching tube Q2 and one end of the fifth resistor R5, the source electrode of the second switching tube Q2 is grounded, the other end of the fifth resistor R5 is respectively connected with the control end of the MOS tube 111 and one end of the sixth resistor R6, and the other end of the sixth resistor R6 is grounded.
The first switching tube Q1 is an NPN triode, the second switching tube Q2 is a PNP triode, and the MOS tube 111 is an NMOS tube. When the output end 3 of the third nand gate 116 outputs a high level, the first switching tube Q1 is turned on, the second switching tube Q2 is turned off, and the MOS tube 111 is turned on. When the output end 3 of the third nand gate 116 outputs a low level, the first switching tube Q1 is turned off, the second switching tube Q2 is turned off, and the MOS tube 111 is turned off.
Optionally, as shown in fig. 3, the LC oscillating circuit 105 includes a first LC oscillating circuit unit and a second LC oscillating circuit unit, an input end of the first LC oscillating circuit unit is used for inputting a direct current source signal, an output end of the first LC oscillating circuit is connected with an input end of the second LC oscillating circuit and a second end of the MOS tube 111 respectively, a third end of the MOS tube 111 is grounded, and an output end of the second LC oscillating circuit is connected with a corresponding array element of the phased array ultrasonic transducer 106.
Optionally, as shown in fig. 3, the first LC oscillating circuit unit includes: the capacitor comprises a Wheatstone bridge 118, a seventh capacitor C7, an eighth capacitor C8, a ninth capacitor C9, a seventh resistor R7, a first inductor L1 and a first diode D1, wherein a first end 1 and a second end 2 of the Wheatstone bridge 118 are respectively connected with direct current source signals, a fourth end 4 of the Wheatstone bridge 118 is grounded, a third end 3 of the Wheatstone bridge 118 is respectively connected with one end of the seventh capacitor C7 and one end of the seventh resistor R7, the other end of the seventh capacitor C7 is grounded, the other end of the seventh resistor R7 is respectively connected with a fourth power supply VCC and a cathode of the first diode D1, an anode of the first diode D1 is connected with a first end 1 of the first inductor L1, a second end 2 of the first inductor L1 is grounded, a third end 3 of the first inductor L1 is respectively connected with one end of the eighth capacitor C8 and one end of the seventh capacitor C7, the other end of the eighth capacitor C8 is grounded, a fourth end 4 of the first inductor L4 is respectively connected with one end of the ninth capacitor C9 and the other end of the fourth capacitor C9, and the other end of the fourth capacitor C9 is grounded.
Optionally, as shown in fig. 3, the second LC oscillating circuit unit includes: a tenth capacitor C10, an eleventh capacitor C11, a twelfth capacitor C12, a thirteenth capacitor C13, a fourteenth capacitor C14, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, a second inductor L2, and a second diode D2, wherein one end of the tenth capacitor C10 is connected to the other end of the ninth capacitor C9, the other end of the tenth capacitor C10 is connected to the first end 1 of the second inductor L2, the second end 2 of the second inductor L2 is connected to the anode of the second diode D2, the cathode of the second diode D2 is connected to one end of the eighth resistor R8, the other end of the eighth resistor R8 is connected to one end of the eighth resistor R9 in parallel with the eleventh capacitor C11, the other end of the ninth resistor R9 in parallel with the eleventh capacitor C11 is connected to the third end 3 of the second inductor L2, the fourth end 4 of the second inductor L2 is connected to one end of the twelfth capacitor C12, the other end of the twelfth capacitor C12 is connected to one end of the thirteenth capacitor C13, the other end of the twelfth capacitor C12 is connected to the other end of the thirteenth capacitor C12, the other end of the thirteenth capacitor C13 is connected to the other end of the thirteenth capacitor C12 is connected to the other end of the thirteenth capacitor C10 in parallel with the fourteenth resistor C14, and the other end of the fourteenth capacitor C14 is connected to the other end of the fourteenth resistor C10 in parallel with the fourteenth resistor C11.
The MOS tube 111 is turned on at a high level, so that the potential at the point v of the connection point between the first LC oscillating circuit unit and the second LC oscillating circuit unit is zero, and at this time, the first inductor L1 and the second inductor L2 both have currents, the value of which is equal to the current passing through the MOS tube 111, and the MOS tube 111 is protected from being burned. When the MOS transistor 111 is turned on, the LC oscillation circuit 105 corresponds to parallel resonance.
When the MOS tube 111 is turned off at a low level, the potential at the point v of the connection point between the first LC oscillating circuit unit and the second LC oscillating circuit unit is not zero, and when the MOS tube 111 is turned off, the LC oscillating circuit 105 corresponds to series resonance. And then outputting a sine wave of high amplitude.
The detailed derivation procedure is as follows:
when the MOS tube is conducted, v is zero, and the first LC oscillating circuit unit and the second LC oscillating circuit unit are connected in parallel. At this time, the liquid crystal display device, That is to say,That is to say,
When the MOS tube is disconnected, the first LC oscillating circuit unit and the second LC oscillating circuit unit are connected in series, at the moment,
Wherein Δi 1＝ΔI2 =Δi according to the volt-second equilibrium condition.
As a result of the fact that,And due toSo that the number of the parts to be processed,
Further, since T on＝toff and T on+toff =t, T on＝toff =Δt, And due toAnd then v=2v in.
Furthermore, when the MOS tube is disconnected, the amplitude of the original 2V in is input, so that the amplitude of the finally output sine wave is improved, and the amplitude is about +/-200V.
Specifically, as shown in fig. 3, the first end 1 and the second end 2 of the signal output device 119 output the dc source signal, the third end 3 and the fourth end 4 output the PWM wave, the fifth end 5 and the sixth end 6 are suspended, i.e. not connected to the signal, when the first end 1 of the optocoupler 113 inputs the high level and the second end 2 inputs the low level, the optocoupler 113 is turned on, the fifth end 5 of the optocoupler outputs the high level, the first input end 1 and the second input end 2 of the first nand gate 114 are both high level, the output end 3 outputs the low level, the first input end 1 of the second nand gate 115 is low level, at this time, the output end 3 of the fourth nand gate 117 in the crystal oscillator unit 109 is high level or low level, the first input end 1 and the second input end 2 of the third nand gate are both high level, at this time, the second switching tube Q2 is turned on, the first MOS tube Q1 is turned off, and the first LC oscillating circuit unit and the second LC oscillating circuit unit are serially connected.
When the first end 1 of the optocoupler 113 inputs a low level and the second end 2 inputs a high level, the optocoupler 113 is disconnected, the fifth end 5 of the optocoupler outputs a low level, the first input end 1 and the second input end 2 of the first nand gate 114 are both low, the output end 3 outputs a high level, the first input end 1 of the second nand gate 115 is high, at this time, when the output end 3 of the fourth nand gate 117 in the crystal oscillator unit 109 outputs a high level, the output end 3 of the second nand gate 115 is low, the first input end 1 and the second input end 2 of the third nand gate are both low, the output end 3 is high, at this time, the second switch tube Q2 is disconnected, the first switch tube Q1 is turned on, the MOS tube 111 is turned on, and the first LC oscillation circuit unit and the second LC oscillation circuit unit are connected in parallel. When the output end 3 of the fourth nand gate 117 in the crystal oscillator unit 109 is at low level, the output end 3 of the second nand gate 115 is at high level, the first input end 1 and the second input end 2 of the third nand gate are both at high level, and the output end 3 is at low level, at this time, the second switching tube Q2 is turned on, the first switching tube Q1 is turned off, the MOS tube 111 is turned off, and the first LC oscillating circuit unit and the second LC oscillating circuit unit are connected in series.
In general, when the optocoupler 113 is turned on, the MOS transistor 111 is in an off state regardless of whether the crystal oscillator unit 109 outputs a fundamental frequency signal; when the optocoupler 113 is turned off, only when the crystal oscillator unit 109 outputs the fundamental frequency signal, the MOS transistor 111 is turned on, and at other times, the MOS transistor 111 is turned off, so that the on/off of the optocoupler 113 and the fundamental frequency signal output by the crystal oscillator unit 109 determine whether the MOS transistor 111 is turned on. Optocoupler 113 acts as a switch in the circuitry. When the optocoupler 113 is on, the LC oscillating circuit 105 does not perform the oscillation sine operation because it does not receive the fundamental frequency signal, in other words, the whole system is in an inactive state. When the optocoupler 113 is turned off, the LC oscillating circuit 105 does not perform oscillation sine when receiving the fundamental frequency signal, that is, when the MOS transistor is turned on, and when the LC oscillating circuit 105 receives the fundamental frequency signal, that is, when the MOS transistor is turned on and off, the LC oscillating circuit 105 performs oscillation sine. That is, the PWM wave output by the focusing delay module 102 only controls the on/off of the optocoupler 113, and has no other effect.
And since the input signal of the LC tank circuit 105 is a dc source signal, the amplitude is higher than that of the square wave signal in the prior art. The traditional phased array ultrasonic transducer can provide high-frequency sinusoidal excitation with the amplitude of +/-20 to +/-50V and square wave excitation with the amplitude of +/-100V, and the sine wave excited by the system is high-frequency sine with the amplitude of +/-200V, and the power is 16 times that of a traditional excitation source.
It should be noted that, the baseband control circuit 104 and the LC oscillating circuit 105 further include a voltage stabilizing circuit unit 120, and as shown in fig. 3, the voltage stabilizing circuit unit 120 includes a fifteenth capacitor C15, a sixteenth capacitor C16, a seventeenth capacitor C17, and a voltage stabilizer 121.
Optionally, as shown in fig. 4 and 5, each phase-locked loop module 40 includes: the focusing delay module 102 is respectively connected with the reference signal unit 124 and the phase-locked loop control unit 125, the LC oscillating circuit 105 is connected with the phase-locked loop control unit 125, and the phase-locked loop control unit 125 is respectively connected with the filtering unit 123 and the reference signal unit 124;
the reference signal unit 124 is configured to receive the reference signal input by the focusing delay module 102; the phase-locked loop control unit 125 selects the excitation signal output from the LC oscillating circuit 105 having the same phase as the reference signal based on the reference signal, controls the filtering unit 123 to filter, and outputs the excitation signal to the corresponding channel of the phased array ultrasonic transducer 106.
It can be understood that the BNC port of the reference signal unit 124 is connected to the reference signal output end of the focusing delay module 102, the enabling port 3 of the phase-locked loop control unit 125 is connected to the focusing delay module 102, and the focusing delay module 102 outputs a reference signal to the reference signal unit 124 and an enabling signal to the enabling port 3 of the phase-locked loop control unit 125, so that the phase-locked loop control unit 125 enters an operating state. The data port 2 of the phase-locked loop control unit 125 is connected to the out end of the LC oscillating circuit 105, so as to receive the sine wave signal output by the LC oscillating circuit 105, lock the phase of the sine wave signal output by the LC oscillating circuit 105 based on the phase of the reference signal, and after the phase is filtered by the filtering unit 123, the excitation signals of each array element entering the concave array transducer reach the array element at the same time, so as to complete the driving of the concave array transducer.
The pll control unit 125 may be an ADF4351BCPZ chip. Specific circuit construction is shown in fig. 5 and 6, and will not be described here again.
It should be noted that, the filtering unit 123 is a loop filter, and a passive third-order filter is used to reduce the noise introduced. In one embodiment, the reference signal is set to 0.5MHz. When exciting the self-focusing phased array ultrasonic transducer and transmitting an ultrasonic transducer excitation instruction, the STM32H743 singlechip outputs an enabling signal 1 to each channel phase-locked loop module, outputs a CLK clock signal and transmits a PWM gating signal to each channel of the ultrasonic transducer excitation system. When the planar array phased array ultrasonic transducer is excited and an ultrasonic transducer excitation instruction is transmitted, the STM32H743 singlechip outputs an enabling signal 0 to each channel phase-locked loop module, does not output a CLK clock signal, and transmits a PWM gating focusing signal with delay to each channel of the ultrasonic transducer excitation system, so that the phased array ultrasonic transducer is focused.
The phased array ultrasonic transducer excitation system 100 for improving the amplitude provided by the embodiment of the invention can improve the focusing sound field intensity used by TMAS, so as to improve the TMAS electric field, and the phased array ultrasonic transducer excitation system 100 for improving the amplitude can be widely applied to all ultrasonic phased array transducers with specific frequencies, and can provide higher amplitude to excite the ultrasonic transducers to provide larger sound intensity. That is, when the fundamental frequency of the crystal oscillator unit is changed, sine waves of different frequencies can be oscillated.
In addition, the phased array ultrasonic transducer excitation system 100 for improving the amplitude provided by the embodiment of the invention is different from the traditional phased array ultrasonic transducer excitation system, the phased array ultrasonic transducer excitation system 100 for improving the amplitude combines an excitation signal generating device and an excitation signal amplifying device into a whole, does not amplify time sequence signals, emits PWM waves to perform multichannel pulse focusing control based on a square wave trigger signal generating system of an STM32H743 singlechip, uses a crystal oscillator to fix frequencies, can provide sine pulses with different frequencies, and uses a phase-locked loop module to perform output pulse phase locking, so that the absolute accuracy of the output time sequence or the phase is ensured, and the high-voltage high-frequency sine circuit directly acts on two ends of a self-focusing phased array ultrasonic transducer to perform transducer focusing excitation, so that the best focusing effect can be obtained.
Furthermore, the phased array ultrasonic transducer excitation system 100 for increasing amplitude provided by the embodiment of the invention has the following advantages that 1) the phase-locked loop module is added to ensure that the output phases of all channels are absolutely consistent, and the optimal focusing output pulse can be provided for the self-focusing phased array ultrasonic transducer. 2) The focusing system can focus other phased array ultrasonic transducers besides exciting the self-focusing phased array ultrasonic transducer. 3) The sine frequency of the excitation pulse is determined by using the crystal oscillator, so that the system has the advantages of stability and good anti-interference performance, and the system frequency can be adjusted by using various crystal oscillator switch connections without changing a circuit because the crystal oscillator is controlled by using a logic gate, and the defect of fixed frequency of a crystal oscillator circuit is overcome. 4) The traditional phased array ultrasonic transducer can provide high-frequency sinusoidal excitation with the amplitude of +/-20 to +/-50V and square wave excitation of +/-100V, the module can provide highest +/-200V high-frequency sinusoidal excitation by using an LC oscillating circuit, the power is 16 times that of a traditional excitation source, and the sinusoidal excitation has zero high-frequency component compared with the square wave excitation, so that load heating and piezoelectric ceramic vibration loss can be reduced, and the service life of the ultrasonic phased array transducer can be remarkably prolonged. 5) The traditional excitation system transmits sine pulses with time sequence information, the focusing delay module is used for transmitting PWM waves to control the transmission and termination of sine waves, the NAND logic gate is used for transmitting PWM waves to control sine signals at high level and controlling sine signals at low level, and therefore the modulation sine pulses are simpler and more convenient to program in actual use. 6) The system combines the excitation signal generating device and the excitation signal amplifying device into a whole, provides circuit reference frequency by using the crystal oscillator, has LC resonance modulation sine, is simpler to assemble compared with other excitation systems, has lower weight, and can be used for expanding phased array transducer focusing control of more channels.
In general, (1) the present embodiment is specifically designed for self-focusing phased array ultrasound transducers, which can produce a focal resolution of a far hyperplane phased array ultrasound transducer in a fixed z-direction. (2) The system uses an LC oscillating circuit to oscillate out sine pulses for pulse excitation, and other systems generally use square wave direct excitation or SPWM, and three-state waves simulate sine excitation. (3) The system only needs to input PWM command signals and a primary direct current power supply, can directly oscillate out a sine through the analog circuit, and the traditional other systems need to edit the sine and amplify the sine. (4) The system does not need to build a power amplifier, the output amplitude does not depend on the performances of a MOSFET and a high-frequency transformer, and the system can provide larger voltage amplitude compared with other systems.
In other words, the system can set relevant parameters of the transducer and the expected numerical values such as the duty ratio of the sine modulation pulse to be transmitted through the PC programming, and the numerical values are directly converted into sine by the hardware analog circuit in a mode of transmitting PWM waves, so that the ultrasonic phased array transducer is subjected to accurate sine focusing excitation.
In summary, the self-focusing phased array ultrasonic transducer driving system capable of providing high voltage according to the embodiment of the invention includes: the system comprises a PC, a focusing delay module, an I/O channel expansion module, a plurality of fundamental frequency control circuits, a plurality of LC oscillating circuits and a plurality of phase-locked loop modules, wherein the fundamental frequency control circuits, the LC oscillating circuits and the phase-locked loop modules are in one-to-one correspondence; the PC is used for providing focusing excitation parameters of all channels of the phased array ultrasonic transducer, the focusing delay module is used for calculating focusing delay data of all channels according to the focusing excitation parameters of all channels, outputting PWM waves which correspond to all channels and carry the focusing delay data by combining the focusing delay data of all channels, the PWM waves which correspond to all channels and carry the focusing delay data are input into corresponding fundamental frequency control circuits through the I/O channel expansion module, each LC oscillating circuit oscillates a direct current source signal into a sine wave signal according to fundamental frequency signals output by the fundamental frequency control circuit and outputs the sine wave signal to the phase-locked loop module, and the phase-locked PWM waves are output to corresponding channels of the phased array ultrasonic transducer after phase-locked by the phase-locked loop module based on reference signals; the focusing delay module is connected with the phase-locked loop module and is used for outputting a reference signal and an enabling signal to the phase-locked loop module. Therefore, the sine wave with high amplitude is excited by the excitation system, has zero high-frequency component, can reduce load heating and piezoelectric ceramic vibration loss, can obviously prolong the service life of the phased array ultrasonic transducer, can reach each array element of the concave array ultrasonic transducer at the same time by the arrangement of the phase-locked loop module, and is suitable for a concave array ultrasonic transducer system.
It should be appreciated that various forms of the flows shown above may be used to reorder, add, or delete steps. For example, the steps described in the present invention may be performed in parallel, sequentially, or in a different order, so long as the desired results of the technical solution of the present invention are achieved, and the present invention is not limited herein.
The above embodiments do not limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications, combinations, sub-combinations and alternatives are possible, depending on design requirements and other factors. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of the present invention.
Claims (9)
1. A self-focusing phased array ultrasonic transducer driving system capable of providing high voltage, comprising:
the system comprises a PC, a focusing delay module, an I/O channel expansion module, a plurality of fundamental frequency control circuits, a plurality of LC oscillating circuits and a plurality of phase-locked loop modules, wherein the fundamental frequency control circuits, the LC oscillating circuits and the phase-locked loop modules are in one-to-one correspondence;
The PC is used for providing focusing excitation parameters of all channels of the phased array ultrasonic transducer, the focusing delay module is used for calculating focusing delay data of all channels according to the focusing excitation parameters of all channels, outputting PWM waves carrying the focusing delay data corresponding to all channels by combining the focusing delay data of all channels, inputting the PWM waves carrying the focusing delay data corresponding to all channels into corresponding fundamental frequency control circuits through the I/O channel expansion module, oscillating a direct current source signal into a sine wave signal according to fundamental frequency signals output by the fundamental frequency control circuits, outputting the sine wave signal to the phase-locked loop module, and outputting the sine wave signal to corresponding channels of the phased array ultrasonic transducer after phase-locking based on reference signals through the phase-locked loop module; the focusing delay module is connected with the phase-locked loop module and is used for outputting the reference signal and the enabling signal to the phase-locked loop module, wherein the phased array ultrasonic transducer is a concave array phased array ultrasonic transducer;
Each phase-locked loop module comprises: the focusing delay module is respectively connected with the reference signal unit and the phase-locked loop control unit, the LC oscillating circuit is connected with the phase-locked loop control unit, and the phase-locked loop control unit is respectively connected with the filtering unit and the reference signal unit;
The reference signal unit is used for receiving a reference signal input by the focusing delay module; the phase-locked loop control unit selects an excitation signal output by the LC oscillating circuit with the same phase as the reference signal based on the reference signal, controls the filtering unit to filter and outputs the excitation signal to a corresponding channel of the phased array ultrasonic transducer; and the phase-locked loop module enables output phases of all channels of the concave array phased array ultrasonic transducer to be consistent.
2. The self-focusing phased array ultrasonic transducer drive system for providing high voltage according to claim 1, wherein the fundamental frequency control circuit comprises:
The optical coupler circuit unit is connected with the I/O channel expansion module, the output end of the optical coupler circuit unit is connected with the input end of the NAND gate circuit unit, the output end of the crystal oscillator unit is connected with the input end of the NAND gate circuit unit, the output end of the NAND gate circuit unit is connected with the MOS tube control unit, and the MOS tube is in an open state or a closed state according to the level signal output by the MOS tube control unit so as to provide a fundamental frequency signal for the LC oscillating circuit.
3. The self-focusing phased array ultrasonic transducer driving system capable of providing high voltage according to claim 2, wherein the optocoupler circuit unit comprises: the PWM circuit comprises a first power chip, an optical coupler and a first capacitor, wherein a first end and a second end of the optical coupler are respectively input with PWM wave signals, a third end of the optical coupler is connected with an output end of the first power chip, a fourth end of the optical coupler is grounded, a fifth end of the optical coupler is connected with a NAND gate circuit unit, the first power chip supplies power for the optical coupler, an output end of the first power chip is also connected with one end of the first capacitor, and the other end of the first capacitor is grounded.
4. A self-focusing phased array ultrasound transducer drive system capable of providing high voltage according to claim 3, wherein said nand gate circuit unit comprises: the first input end of the first NAND gate is connected with one end of the first resistor, the other end of the first resistor is connected with a second power supply, the first input end of the first NAND gate is connected with the second input end, and the second input end of the first NAND gate is connected with the fifth end of the optical coupler;
the output end of the first NAND gate is connected with the first input end of the second NAND gate, the second input end of the second NAND gate is connected with the crystal oscillator unit, the output end of the second NAND gate is respectively connected with the first input end and the second input end of a third NAND gate, and the output end of the third NAND gate is connected with the input end of the MOS tube control unit.
5. The self-focusing phased array ultrasonic transducer drive system for providing high voltage according to claim 4, wherein the crystal oscillator unit comprises: the second capacitor and one end of the third capacitor are grounded, the other end of the second capacitor is connected with one end of the fourth capacitor, the other end of the third capacitor is connected with the other end of the fourth capacitor, the other end of the fourth capacitor is also connected with one end of the second resistor, the other end of the second resistor is connected with the output end of the fourth NAND gate, one end of the fourth capacitor is also connected with the first input end and the second input end of the fourth NAND gate, one end of the third resistor is connected with the first input end and the second input end of the fourth NAND gate, the other end of the third resistor is connected with the output end of the fourth NAND gate, and the output end of the fourth NAND gate is connected with the second input end of the second NAND gate.
6. The self-focusing phased array ultrasonic transducer driving system capable of providing high voltage according to claim 4, the MOS tube control unit is characterized by comprising: the MOS transistor comprises a fourth resistor, a fifth resistor, a sixth resistor, a fifth capacitor, a sixth capacitor, a first switch tube and a second switch tube, wherein one end of the fourth resistor and one end of the fifth capacitor which are connected in parallel are connected with the output end of the third NAND gate, the other end of the fourth resistor and one end of the fifth capacitor are connected with the control end of the second switch tube respectively, the source electrode of the first switch tube is connected with one end of a third power supply and one end of the sixth capacitor, the other end of the sixth capacitor is grounded, the drain electrode of the first switch tube is connected with the drain electrode of the second switch tube and one end of the fifth resistor respectively, the source electrode of the second switch tube is grounded, the other end of the fifth resistor is connected with the control end of the MOS tube and one end of the sixth resistor respectively, and the other end of the sixth resistor is grounded.
7. The driving system of the self-focusing phased array ultrasonic transducer capable of providing high voltage according to claim 2, wherein the LC oscillating circuit comprises a first LC oscillating circuit unit and a second LC oscillating circuit unit, the input end of the first LC oscillating circuit unit is used for inputting the direct current source signal, the output end of the first LC oscillating circuit is respectively connected with the input end of the second LC oscillating circuit and the second end of the MOS tube, the third end of the MOS tube is grounded, and the output end of the second LC oscillating circuit is connected with the corresponding array element of the phased array ultrasonic transducer.
8. The self-focusing phased array ultrasonic transducer driving system capable of providing high voltage according to claim 7, wherein the first LC oscillating circuit unit comprises: the circuit comprises a Wheatstone bridge, a seventh capacitor, an eighth capacitor, a ninth capacitor, a seventh resistor, a first inductor and a first diode, wherein a first end and a second end of the Wheatstone bridge are respectively connected with the direct current source signal, a fourth end of the Wheatstone bridge is grounded, a third end of the Wheatstone bridge is respectively connected with one end of the seventh capacitor and one end of the seventh resistor, the other end of the seventh capacitor is grounded, the other end of the seventh resistor is respectively connected with a fourth power supply and a cathode of the first diode, an anode of the first diode is connected with a first end of the first inductor, a second end of the first inductor is grounded, a third end of the first inductor is respectively connected with one end of the eighth capacitor and one end of the seventh capacitor, the other end of the eighth capacitor is grounded, a fourth end of the first inductor is respectively connected with one end of the ninth capacitor and one end of the second oscillating circuit unit, and the other end of the ninth capacitor is grounded.
9. The self-focusing phased array ultrasonic transducer driving system capable of providing high voltage according to claim 8, wherein the second LC oscillating circuit unit comprises: the ultrasonic transducer comprises a tenth capacitor, an eleventh capacitor, a twelfth capacitor, a thirteenth capacitor, a fourteenth capacitor, an eighth resistor, a ninth resistor, a tenth resistor, a second inductor and a second diode, wherein one end of the tenth capacitor is connected with one end of the ninth capacitor, the other end of the tenth capacitor is connected with the first end of the second inductor, the second end of the second inductor is connected with an anode of the second diode, a cathode of the second diode is connected with one end of the eighth resistor, the other end of the eighth resistor is connected with one end of the ninth resistor and one end of the eleventh capacitor which are connected in parallel, the other end of the ninth resistor and the other end of the eleventh capacitor are connected with the third end of the second inductor, the fourth end of the second inductor is connected with one end of the twelfth capacitor respectively, the other end of the twelfth capacitor is connected with one end of the thirteenth capacitor, the other end of the thirteenth capacitor is grounded, the other end of the thirteenth capacitor is connected with one end of the tenth resistor, the first end of the tenth resistor is grounded, the other end of the eleventh resistor is connected with the other end of the eleventh capacitor, the other end of the eleventh capacitor is connected with the fourteenth capacitor in parallel, the other end of the eleventh capacitor is connected with the fourteenth capacitor, and the other end of the fourteenth capacitor is connected with the fourteenth capacitor.
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| CN114177524A (en) * | 2021-11-29 | 2022-03-15 | 中国医学科学院生物医学工程研究所 | Phased array ultrasonic transducer excitation system for improving amplitude |
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| US8485974B2 (en) * | 2010-11-15 | 2013-07-16 | National Health Research Institutes | Multiple-frequency ultrasonic phased array driving system |
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| CN114177524A (en) * | 2021-11-29 | 2022-03-15 | 中国医学科学院生物医学工程研究所 | Phased array ultrasonic transducer excitation system for improving amplitude |
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