CN112731829A - Dynamic matching network of medical ultrasonic power supply and matching method thereof - Google Patents
Dynamic matching network of medical ultrasonic power supply and matching method thereof Download PDFInfo
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- G05B19/00—Programme-control systems
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- G—PHYSICS
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Abstract
The invention discloses a dynamic matching network of a medical ultrasonic power supply and a matching method thereof, wherein the matching network comprises a feedback circuit, a controller, a signal generator, a rectifying and filtering circuit, a power inverter circuit, a matching transformer, a matching inductor and an ultrasonic transducer which are sequentially connected; the matching inductor is used for compensating the ultrasonic transducer; the feedback circuit is used for acquiring a voltage effective value and a current effective value of two ends of the ultrasonic transducer and a phase difference between a voltage signal and a current signal; the controller is used for adjusting the inductance value of the matching inductor according to the data. The feedback circuit monitors the effective values of the voltage and the current of the ultrasonic transducer and the phase difference of the voltage and the current signals in real time, and the controller is used for controlling the inductance value accessed by the matching inductor, so that the working process of the ultrasonic transducer is always in a resonance state. The dynamic response speed is fast, the precision is high, the sound-electricity conversion efficiency is high, and meanwhile, the circuit structure is simple, the cost is low, and the wide application prospect is achieved.
Description
Technical Field
The invention relates to the field of ultrasonic power supplies, in particular to a dynamic matching network of a medical ultrasonic power supply and a matching method thereof.
Background
Ultrasonic waves refer to sound waves with frequency of more than 20KHz, and have been widely used in military, industry, agriculture, medicine and other fields due to their good directivity and strong penetrating power. In the medical field, the ultrasonic technology is mainly applied to the aspects of ultrasonic knife operation, ultrasonic atomization, B-ultrasonic examination, ultrasonic pharmacy and the like. Compared with the traditional operation, the ultrasonic scalpel operation has the advantages of high cutting precision, small wound range, good blood coagulation effect, clearer visual field, greatly shortened operation time, quick postoperative recovery and the like, and brings great benefits to doctors and patients.
An ultrasonic generator, or an ultrasonic power supply, which is an important component of an ultrasonic scalpel surgery system, is a device for supplying energy to an ultrasonic transducer. The function of the ultrasonic vibration control system is to convert commercial power (220V &50Hz) into an ultrasonic signal to drive an ultrasonic transducer and simultaneously control the operation of the whole vibration system. In an ultrasonic vibration system, the impedance matching effect of an ultrasonic power supply and a transducer plays an important role, the quality degree directly determines whether the ultrasonic vibration system can safely work, and if the matching distortion occurs, the temperature of the transducer is increased, the electroacoustic conversion efficiency is reduced, and even the transducer is burnt in severe cases.
The transducer acts as a load in the ultrasound system and has its own capacitive impedance characteristics. Therefore, an inductive element is often used to compensate in the design of the matching network, and tuning is achieved by a static or dynamic matching method. Among them, static matching is the most commonly used method at present because of its simple circuit and easy implementation. Before the ultrasonic power supply works, the impedance of the ultrasonic transducer is measured by an impedance analyzer and other tools, and element parameters of the matching circuit are obtained. The matching network parameters are manually adjusted to bring the transducer to a resonant state, and once determined, the matching elements are not changed. However, the impedance characteristics of the transducer can change with the changes of load, temperature and the like during the working process, and the corresponding resonant frequency can shift, so that the system efficiency is reduced. Therefore, the static matching method cannot solve the problem that the frequency jump of the transducer in the working process causes matching distortion. The dynamic matching overcomes the defect of static matching, the transducer, the ultrasonic power supply and the matching network form a closed loop system in the dynamic matching, and the parameters of the ultrasonic power supply or the matching network are adjusted according to the feedback signal of the transducer loop, so that the transducer always works in a resonance state. At the present stage, the dynamic matching generally uses a frequency tracking technology, tracks the change of the resonant frequency of the system in real time, ensures the circuit matching, improves the efficiency of the system, and can overcome the influence caused by the condition change such as temperature rise in the static matching, but has the following defects: in the prior art of dynamic matching, a current transformer is mainly used for sampling voltage and current signals in an ultrasonic power supply and is sequentially connected with a passband filter circuit and a comparison shaping circuit through a wire.
In summary, it is an urgent need to solve the above problems to provide a dynamic matching technique for medical ultrasonic power supply with simple circuit structure, excellent performance, low cost and suitable for commercial application.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a dynamic matching network of a medical ultrasonic power supply and a matching method thereof, which are used for enabling the working process of an ultrasonic transducer to be always in a resonance state by detecting the impedance parameter of a loop of the ultrasonic transducer in real time and dynamically adjusting the size of a matching inductor.
The first aspect provides a dynamic matching network of a medical ultrasonic power supply, which comprises a feedback circuit, a controller, a signal generator, a rectifying and filtering circuit, a power inverter circuit, a matching transformer, a matching inductor and an ultrasonic transducer, wherein the signal generator, the rectifying and filtering circuit, the power inverter circuit, the matching transformer, the matching inductor and the ultrasonic transducer are sequentially connected;
the input end of the feedback circuit is connected with the ultrasonic transducer, and the output end of the feedback circuit is connected with the controller; the output end of the controller is connected with the matching inductor;
the inductance value of the matching inductor is adjustable and is used for compensating the ultrasonic transducer to realize tuning matching;
the feedback circuit is used for acquiring voltage effective values and current effective values of two ends of the ultrasonic transducer in real time, acquiring phase difference between voltage signals and current signals of the two ends of the ultrasonic transducer and transmitting the phase difference to the controller;
the controller is used for adjusting the inductance value of the matching inductor according to the received real-time voltage effective value, the received current effective value and the phase difference between the voltage signal and the current signal.
According to the dynamic matching network of the medical ultrasonic power supply, the effective voltage value and the effective current value of the two ends of the ultrasonic transducer and the phase difference between the voltage signal and the current signal of the two ends of the ultrasonic transducer are obtained in real time through the feedback circuit, then the current inductance value of the matched inductor is calculated according to the data through the controller, then the control signal is generated to adjust the inductance value of the matched inductor, dynamic matching is achieved, and the working process of the ultrasonic transducer is in a resonance state all the time.
Further, the signal generator is used for generating a driving signal with the frequency of 30 KHz-60 KHz.
Further, the rectification filter circuit comprises a rectification unit and a filter unit which are connected with each other; the rectification unit is an uncontrolled bridge type rectification circuit and is used for complete alternating current-direct current conversion; the filtering unit is used for suppressing direct current pulsation and eliminating alternating current harmonic waves.
Through a large number of experiments, the invention determines that the circuit structure of the rectifying unit adopts the uncontrolled bridge type rectifying circuit, the voltage of the output direct current bus of the circuit structure is high, the reverse withstand voltage born by a rectifying device is lower, the loss in the rectifying process is lower, the efficiency of the power supply can be improved, the input requirement of an inverter bridge can be met, and the invention is very suitable for the inverter type ultrasonic power supply.
Further, the power inverter circuit is a full-bridge inverter circuit.
According to the invention, through a large number of experiments, the circuit structure of the power inverter part is determined to adopt a full-bridge inverter circuit, and the circuit structure has the advantages of the same output voltage as the bus voltage, high output power efficiency, small power loss of a switch tube and the like.
Further, the matching transformer is a high-frequency transformer adopting an E-type ferrite core.
Further, the matching inductor comprises a plurality of uH-level power inductors connected in series, two ends of each inductor are connected in parallel with a relay, the relays are connected with the controller, and the controller operates the short circuit or the connection of the corresponding inductors by controlling the on-off of the relays.
Furthermore, the feedback circuit comprises a sampling circuit, a phase discrimination circuit and a current-voltage effective value conversion circuit; the phase discrimination circuit and the current-voltage effective value conversion circuit are both connected with the sampling circuit; the sampling circuit is used for acquiring current signals flowing through the ultrasonic transducer and acquiring voltage signals at two ends of the ultrasonic transducer; the current voltage effective value conversion circuit is used for acquiring a corresponding current effective value and a corresponding voltage effective value according to the current signal and the voltage signal acquired by the sampling circuit and outputting the current effective value and the voltage effective value to the controller; the phase discrimination circuit is used for comparing the phase of the voltage signal acquired by the sampling circuit with the phase of the current signal and generating a phase difference signal to output to the controller.
Further, the ultrasonic transducer is a piezoelectric ceramic transducer, wherein the piezoelectric ceramic is PZT4 or PZT 8.
Further, the controller is a Digital Signal Processor (DSP) controller, and a TMS320F2812 chip is selected as a chip of the controller.
Through a large number of experiments, the TMS320F2812 chip serving as the controller is determined to have strong digital signal processing capacity and high data processing speed, and is particularly suitable for the field with high requirements on processing speed and processing precision, such as the power supply. The high-performance CMOS technology is adopted, the highest main frequency reaches 150MHz, and the clock period is 6.67 ns; by adopting a high-performance 32-bit central processing unit and an advanced Harvard bus framework, 32-bit multiply-accumulate operation or 2 16-bit multiply-accumulate operations can be completed in one period, and the system has quick interrupt response and interrupt processing capability, a unified register programming mode and compatibility with various programming languages; flash with 128K 16 bits in chip, standard mathematical function library, random access memory (SRAM) with 18K 16 bits, external memory interface with 1M 16 bits total memory space.
In a second aspect, a dynamic matching method for a medical ultrasonic power supply is provided, which uses the dynamic matching network for the medical ultrasonic power supply to perform dynamic matching, and includes the following steps:
the impedance mode and the impedance angle are derived from the definition of the impedance:
wherein Z represents impedance, R represents the real part of impedance-resistance, and X represents the imaginary part of impedance-reactance; the Z is an impedance mode and represents the effective value of the voltages at two ends of the ultrasonic transducer
And current effective value
Ratio of (i) to (ii)
Representing the phase difference between the voltage signal and the current signal at two ends of the ultrasonic transducer as an impedance angle;
acquiring real-time voltage effective values and current effective values at two ends of the ultrasonic transducer through a feedback circuit so as to obtain an impedance mode; acquiring the phase difference between the real-time voltage signal and the current signal at two ends of the ultrasonic transducer so as to obtain an impedance angle;
applying a formula based on the impedance mode and the impedance angle
Obtaining a reactance X, and obtaining the inductance value of the required matching inductor by the controller according to the series resonance condition X-2 pi fL based on the real-time change of the reactance X; wherein f represents the system resonant frequency and L represents the inductance value;
and the controller adjusts the inductance value of the accessed matching inductor according to the obtained inductance value of the required matching inductor in real time, so that the working process of the ultrasonic transducer is always in a resonance state.
Advantageous effects
The invention provides a dynamic matching network of a medical ultrasonic power supply and a matching method thereof, which firstly adopts a digital inductance matching mode on the basis of an inversion type ultrasonic power supply structure, the effective values of the voltage and the current of the ultrasonic transducer and the phase difference of the voltage and the current signals are monitored in real time through a feedback circuit, the inductance value connected with the matching inductor is controlled by utilizing the operational capability of the controller, thereby achieving the purpose of dynamically adjusting the size of the matching element, realizing that the working process of the ultrasonic transducer is always in a resonance state, obtaining a matching network with high dynamic response speed, high precision and high sound-electricity conversion efficiency, meanwhile, the circuit is simple in structure, low in cost and very suitable for large-scale application, effectively solves the problems of matching distortion, complex circuit structure, high cost and the like caused by frequency mutation in the prior art, and has wide application prospect.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic diagram of an overall structure of a dynamic matching network of a medical ultrasonic power supply according to an embodiment of the present invention;
fig. 2 is a circuit diagram of a matching inductor according to an embodiment of the present invention;
fig. 3 is a schematic circuit diagram of a dynamic matching network of a medical ultrasonic power supply according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
As shown in fig. 1 to 3, an embodiment of the present invention provides a dynamic matching network for a medical ultrasonic power supply, which includes a feedback circuit 7, a controller 8, and a signal generator 1, a rectifying and filtering circuit 2, a power inverter circuit 3, a matching transformer 4, a matching inductor 5, and an ultrasonic transducer 6, which are connected in sequence;
the input end of the feedback circuit 7 is connected with the ultrasonic transducer 6, and the output end thereof is connected with the controller 8; the output end of the controller 8 is connected with the matching inductor 5;
the inductance value of the matching inductor 5 is adjustable and is used for compensating the ultrasonic transducer 6 to realize tuning matching;
the feedback circuit 7 is used for acquiring a voltage effective value and a current effective value of two ends of the ultrasonic transducer 6 in real time, acquiring a phase difference between a voltage signal and a current signal of two ends of the ultrasonic transducer 6, and transmitting the phase difference to the controller 8;
the controller 8 is configured to adjust an inductance value of the matching inductor 5 according to the received real-time voltage effective value, current effective value, and a phase difference between the voltage signal and the current signal.
The dynamic matching network for the medical ultrasonic power supply provided by the embodiment obtains the voltage effective value and the current effective value of the two ends of the ultrasonic transducer 6 and the phase difference between the voltage signal and the current signal of the two ends of the ultrasonic transducer 6 in real time through the feedback circuit 7, then calculates the inductance value of the current required matching inductor 5 according to the data through the controller 8, and then generates the control signal to adjust the inductance value of the matching inductor, so that dynamic matching is realized, and the working process of the ultrasonic transducer 6 is always in a resonance state.
Specifically, the output end of the signal generator 1 is connected to the rectifying and filtering circuit 2, and is configured to generate a driving signal with a frequency of 30KHz to 60KHz, in this embodiment, a driving signal with a frequency of 55KHz is generated.
The input end of the rectification filter circuit 2 is connected with the signal generator 1, and the output end of the rectification filter circuit is connected with the power inverter circuit 3 and comprises a rectification unit and a filter unit which are connected with each other; the rectifying unit adopts an uncontrolled bridge type rectifying circuit and is used for complete alternating current-direct current conversion, and because the circuit structure has high voltage of an output direct current bus, the reverse withstand voltage born by a rectifying device is lower, the loss in the rectifying process is lower, the efficiency of a power supply can be improved, the input requirement of an inverter bridge is met, and the circuit structure is very suitable for an inverter type ultrasonic power supply; the filter unit is used for inhibiting direct current pulsation and eliminating alternating current harmonic waves and comprises a filter capacitor and a filter inductor, the filter capacitor has the main function of inhibiting the direct current pulsation and smoothing a waveform, and the filter inductor has the main function of eliminating the alternating current harmonic waves.
The input end of the power inverter circuit 3 is connected with the rectifying filter circuit 2, the output end of the power inverter circuit is connected with the matching transformer 4, and the power inverter circuit 3 adopts a full-bridge inverter circuit and is used for converting direct current into ultrasonic frequency alternating current and changing the output power. The circuit structure has the advantages of same output voltage as the bus voltage, high output power efficiency, small power loss of the switch tube and the like.
The input end of the matching transformer 4 is connected with the power inverter circuit 3, and the output end of the matching transformer is connected with the matching inductor 5; the matching transformer 4 is a high-frequency transformer adopting an E-type ferrite magnetic core, and is mainly used for carrying out resistance change on a load 9 of the ultrasonic power supply to realize that the internal resistance of the power supply is equal to the load impedance.
The input end of the matching inductor 5 is connected with the matching transformer 4, and the output end of the matching inductor is connected with the ultrasonic transducer 6; the matching inductor 5 is used for compensating the ultrasonic transducer through an inductive element to realize tuning matching. In this embodiment, the matching inductor 5 is formed by connecting 16 uH-level power inductors in series, and the inductance values thereof are 128, 64, 32, 16, 8, 4, 2, 1, 0.5, 0.25, 0.125, 0.063, 0.031, 0.016, 0.008, and 0.004, respectively; and two ends of each inductor are connected with a relay in parallel, the controller operates the short circuit or access of the matching inductor by controlling the on-off of the relay, and the circuit structure of the matching inductor 5 is shown in figure 2.
The input end of the ultrasonic transducer 6 is connected with the matching inductor 5, and the output end of the ultrasonic transducer is connected with the load 9; the ultrasonic transducer 6 is used for converting alternating current (electric energy) input from an ultrasonic power supply into sound waves (mechanical energy), and transmitting and driving a load to work; in this embodiment, the ultrasonic transducer 6 is a piezoelectric ceramic transducer, wherein the piezoelectric ceramic is PZT4 or PZT 8.
The input end of the feedback circuit 7 is connected with the ultrasonic transducer 6, and the output end of the feedback circuit is connected with the controller 8; the feedback circuit 7 comprises a sampling circuit, a phase discrimination circuit and a current-voltage effective value conversion circuit; the phase discrimination circuit and the current-voltage effective value conversion circuit are both connected with the sampling circuit. The sampling circuit is used for acquiring a current signal flowing through the ultrasonic transducer and acquiring voltage signals at two ends of the ultrasonic transducer, and in the embodiment, the current signal and the voltage signal are detected by a Hall current sensor and a Hall voltage sensor respectively; the current voltage effective value conversion circuit is used for acquiring a corresponding current effective value and a corresponding voltage effective value according to the current signal and the voltage signal acquired by the sampling circuit and outputting the current effective value and the voltage effective value to the controller, and specifically, an effective value conversion chip can be used for acquiring the current effective value and the voltage effective value; the phase discrimination circuit is used for carrying out phase comparison on the phase of the voltage signal acquired by the sampling circuit and the phase of the current signal and generating a phase difference signal to be output to the controller, and the phase discrimination circuit can be specifically realized through the phase discriminator.
Further, the controller 8 is a Digital Signal Processor (DSP) controller, and selects a TMS320F2812 chip as a chip of the controller, and further includes a clock circuit, a power supply circuit, a reset circuit, and other elements connected to the chip. The TMS320F2812 chip has strong digital signal processing capacity and high data processing speed, and is particularly suitable for the fields of the power supply, such as the field with high requirements on processing speed and processing precision. The high-performance CMOS technology is adopted, the highest main frequency reaches 150MHz, and the clock period is 6.67 ns; by adopting a high-performance 32-bit central processing unit and an advanced Harvard bus framework, 32-bit multiply-accumulate operation or 2 16-bit multiply-accumulate operations can be completed in one period, and the system has quick interrupt response and interrupt processing capability, a unified register programming mode and compatibility with various programming languages; flash with 128K 16 bits in chip, standard mathematical function library, random access memory (SRAM) with 18K 16 bits, external memory interface with 1M 16 bits total memory space.
As shown in fig. 3, a schematic diagram of a circuit implemented by the present embodiment is provided, in which a signal generator 1, a rectifying and filtering circuit 2, a power inverter circuit 3, and a matching transformer 4 constitute an ultrasonic generator in the diagram.
Another embodiment of the present invention provides a dynamic matching method for a medical ultrasonic power supply, which uses the dynamic matching network for the medical ultrasonic power supply provided in the above embodiment to perform dynamic matching, and includes the following steps:
s1: the impedance mode and the impedance angle are derived from the definition of the impedance:
wherein Z represents impedance, R represents the real part of impedance-resistance, and X represents the imaginary part of impedance-reactance; the Z is an impedance mode and represents the effective value of the voltages at two ends of the ultrasonic transducer
And current effective value
Ratio of (i) to (ii)
Representing the phase difference between the voltage signal and the current signal at two ends of the ultrasonic transducer as an impedance angle;
s2: at a certain time t1, acquiring real-time voltage effective values and current effective values at two ends of the ultrasonic transducer through a feedback circuit so as to obtain an impedance mode of the ultrasonic transducer in a real-time working process; acquiring the phase difference between the real-time voltage signal and the current signal at two ends of the ultrasonic transducer so as to obtain an impedance angle of the ultrasonic transducer in the real-time working process;
s3: the controller obtains an imaginary part X of impedance at a certain time t1 as 10.339 omega according to the impedance mode and the impedance angle, and then obtains an inductance value of the required matching inductor as 29.664uH according to a series resonance condition X as 2 pi fL; wherein f represents the system resonant frequency and L represents the inductance value;
s4: the controller adjusts the inductance value of the accessed matching inductor according to the obtained inductance value of the required matching inductor, in the embodiment, the inductance values are 16, 8, 4, 1, 0.5, 0.125, 0.031 and 0.008 of the access of the matching inductor by controlling the on-off of the relay, so that the aim of dynamically adjusting the matching inductor is fulfilled;
s5: and if the load impedance changes at a certain time t2, repeating the steps S1-S4 to obtain a new matching inductor, so that the working process of the ultrasonic transducer is always in a resonance state.
It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar parts in other embodiments may be referred to for the content which is not described in detail in some embodiments.
Any process or method descriptions in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and alternate implementations are included within the scope of the preferred embodiment of the present invention in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A dynamic matching network of a medical ultrasonic power supply is characterized by comprising a feedback circuit, a controller, a signal generator, a rectifying and filtering circuit, a power inverter circuit, a matching transformer, a matching inductor and an ultrasonic transducer, wherein the signal generator, the rectifying and filtering circuit, the power inverter circuit, the matching transformer, the matching inductor and the ultrasonic transducer are sequentially connected;
the input end of the feedback circuit is connected with the ultrasonic transducer, and the output end of the feedback circuit is connected with the controller; the output end of the controller is connected with the matching inductor;
the inductance value of the matching inductor is adjustable and is used for compensating the ultrasonic transducer to realize tuning matching;
the feedback circuit is used for acquiring voltage effective values and current effective values of two ends of the ultrasonic transducer in real time, acquiring phase difference between voltage signals and current signals of the two ends of the ultrasonic transducer and transmitting the phase difference to the controller;
the controller is used for adjusting the inductance value of the matching inductor according to the received real-time voltage effective value, the received current effective value and the phase difference between the voltage signal and the current signal.
2. The dynamic matching network for a medical ultrasonic power supply of claim 1, wherein the signal generator is configured to generate a driving signal having a frequency of 30KHz to 60 KHz.
3. The dynamic matching network for medical ultrasonic power supply according to claim 1, wherein the rectifying and filtering circuit comprises a rectifying unit and a filtering unit which are connected with each other; the rectification unit is an uncontrolled bridge type rectification circuit and is used for complete alternating current-direct current conversion; the filtering unit is used for suppressing direct current pulsation and eliminating alternating current harmonic waves.
4. The dynamic matching network for medical ultrasonic power supply according to claim 1, wherein the power inverter circuit is a full bridge inverter circuit.
5. The dynamic matching network for medical ultrasonic power supply of claim 1, wherein the matching transformer is a high frequency transformer using E-type ferrite core.
6. The dynamic matching network of medical ultrasonic power supply according to any one of claims 1 to 5, wherein the matching inductor comprises a plurality of uH-level power inductors connected in series, and a relay is connected in parallel to two ends of each inductor, the relay is connected with the controller, and the controller operates the short circuit or connection of the corresponding inductor by controlling the on-off of the relay.
7. The dynamic matching network for a medical ultrasonic power supply according to claim 6, wherein the feedback circuit comprises a sampling circuit, a phase discrimination circuit and a current-voltage effective value conversion circuit; the phase discrimination circuit and the current-voltage effective value conversion circuit are both connected with the sampling circuit; the sampling circuit is used for acquiring current signals flowing through the ultrasonic transducer and acquiring voltage signals at two ends of the ultrasonic transducer; the current voltage effective value conversion circuit is used for acquiring a corresponding current effective value and a corresponding voltage effective value according to the current signal and the voltage signal acquired by the sampling circuit and outputting the current effective value and the voltage effective value to the controller; the phase discrimination circuit is used for comparing the phase of the voltage signal acquired by the sampling circuit with the phase of the current signal and generating a phase difference signal to output to the controller.
8. The dynamic matching network for medical ultrasonic power supply of claim 1, wherein said ultrasonic transducer is a piezoelectric ceramic transducer, wherein the piezoelectric ceramic is PZT4 or PZT 8.
9. The dynamic matching network for a medical ultrasound power supply of claim 1, wherein said controller is a digital signal processor controller.
10. A dynamic matching method of a medical ultrasonic power supply, which uses the dynamic matching network of the medical ultrasonic power supply according to any one of claims 1 to 9 for dynamic matching, comprising the steps of:
the impedance mode and the impedance angle are derived from the definition of the impedance:
wherein Z represents impedance, R represents the real part of impedance-resistance, and X represents the imaginary part of impedance-reactance; the Z is an impedance mode and represents the effective value of the voltages at two ends of the ultrasonic transducer
And current effective value
Ratio of (i) to (ii)
Representing the phase difference between the voltage signal and the current signal at two ends of the ultrasonic transducer as an impedance angle;
acquiring real-time voltage effective values and current effective values at two ends of the ultrasonic transducer through a feedback circuit so as to obtain an impedance mode; acquiring the phase difference between the real-time voltage signal and the current signal at two ends of the ultrasonic transducer so as to obtain an impedance angle;
applying a formula based on the impedance mode and the impedance angle
Obtaining a reactance X, and obtaining the inductance value of the required matching inductor by the controller according to the series resonance condition X-2 pi fL based on the real-time change of the reactance X; wherein f represents the system resonant frequency and L represents the inductance value;
and the controller adjusts the inductance value of the accessed matching inductor according to the obtained inductance value of the required matching inductor in real time, so that the working process of the ultrasonic transducer is always in a resonance state.
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| CN114101015A (en) * | 2022-01-25 | 2022-03-01 | 深圳市大族光电设备有限公司 | Ultrasonic transducer and control system, method and device thereof |
| CN115252059A (en) * | 2022-05-25 | 2022-11-01 | 江苏邦士医疗科技有限公司 | Ultrasonic surgical operation system |
| WO2024037496A1 (en) * | 2022-08-15 | 2024-02-22 | 深圳市合元科技有限公司 | Impedance identification method for ultrasonic atomizer, and ultrasonic atomizer |
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| CN114101015A (en) * | 2022-01-25 | 2022-03-01 | 深圳市大族光电设备有限公司 | Ultrasonic transducer and control system, method and device thereof |
| CN115252059A (en) * | 2022-05-25 | 2022-11-01 | 江苏邦士医疗科技有限公司 | Ultrasonic surgical operation system |
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