CN106667547A - Ultrasound-knife-rod resonance control device and control method - Google Patents
Ultrasound-knife-rod resonance control device and control method Download PDFInfo
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- CN106667547A CN106667547A CN201610459372.XA CN201610459372A CN106667547A CN 106667547 A CN106667547 A CN 106667547A CN 201610459372 A CN201610459372 A CN 201610459372A CN 106667547 A CN106667547 A CN 106667547A
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
- A61B17/00—Surgical instruments, devices or methods, e.g. tourniquets
- A61B17/32—Surgical cutting instruments
- A61B17/320068—Surgical cutting instruments using mechanical vibrations, e.g. ultrasonic
Abstract
The invention relates to an ultrasound-knife-rod resonance control device and a control method. The technical problems that a resonance control device of an existing ultrasound knife rod is complex in structure, weak in noise suppression capacity and low in control accuracy are solved. The ultrasound-knife-rod resonance control device comprises an FPGA module, a DAC module, a first ADC module, a second ADC module, an amplifying circuit module, a current monitoring module, a voltage monitoring module, a power supply module and a clock module. The DAC module is connected with the FPGA module, the first ADC module is connected with the FPGA module, the second ADC module is connected with the FPGA module, and the input end of the amplifying circuit module is connected with the DAC module; the input end of the current monitoring module and the input end of the voltage monitoring module are respectively connected with the output end of the amplifying circuit module; the output end of the current monitoring module is connected with the first ADC module, and the output end of the voltage monitoring module is connected with the second ADC module. The ultrasound-knife-rod resonance control device and the control method can be widely applied to an ultrasound-knife control system.
Description
Technical field
The present invention relates to a kind of control device and control method, specifically a kind of ultrasound knife knife bar resonance control apparatus and
Control method.
Background technology
Ultrasound knife is increasingly widely applied in surgical operation, according to the construction and operation principle of concrete apparatus,
Ultrasound knife can carry out blood coagulation while cutting tissue, and without electric current by human body in its course of work, tissue eschar is little, from
And the damage to patient is little.Ultrasound knife can be used for open surgery, peritoneoscope or endo-surgical (including machine
The human-aided operation of device).
Ultrasound knife generally comprises ultrasound knife main frame, driving handle, cutter head and controlling switch, and cutter head is by handle, knife bar and knife
Point composition.When ultrasound knife works, the knife bar and point of a knife of ultrasound knife host computer control cutter head carry out high-frequent reciprocating motion to produce only
Blood and the effect of cutting.
In actual use, cutter head changes amplitude also in constantly change so as to cause the efficiency drop cut with load
It is low, have a strong impact on using effect.
Ultrasound knife knife bar and point of a knife is set to be in optimum Working, it is necessary to be at resonant operational by control device
State.The resonant frequency of ultrasound knife knife bar can constantly change with the different of the tissue of contact.
The ultrasonic equivalent-circuit model as shown in description attached middle school Fig. 1, when ultrasound knife knife bar is in resonant condition, induction reactance and
Capacitive reactance is offset, and the resistance value that ultrasound knife equivalent-circuit model is presented is exactly pure resistance, the voltage at the ultrasound knife two ends now fed back
It is same phase with electric current, otherwise due to capacitive reactance and the impact of induction reactance, the voltage and current at the ultrasound knife two ends of feedback is present necessarily
Phase contrast.
The zero-crossing comparator that existing control device typically passes through two inputs using the voltage and current signal of scene feedback,
Then microprocessor monitors again the phase contrast that the time difference of the square wave of the output of zero-crossing comparator assesses voltage and current, so as to true
Whether stationary knife bar is operated in resonant condition.Such device is primarily present following technological deficiency：
1) when by zero-crossing comparator, the noise jamming being vulnerable at signal zero position suppresses the energy of signal noise
Power is weaker, causes than larger error；
2) circuit structure is more complicated.
The content of the invention
The present invention is exactly to solve resonance control apparatus complex structure, the noise inhibiting ability of existing ultrasound knife knife bar
The low technical problem of weak, control accuracy, there is provided a kind of simple structure, noise inhibiting ability be strong, being capable of precise control ultrasound knife knife
Ultrasound knife knife bar amplitude control unit and control method of the bar in resonant operational state.
The technical scheme is that, there is provided a kind of ultrasound knife knife bar resonance control apparatus, including FPGA module, DAC moulds
Block, ADC one, ADC two, amplification circuit module, current monitoring module, voltage monitoring module, power module, clock mould
Block and output interface module, DAC module is connected with FPGA module, and ADC one is connected with FPGA module, ADC two with
FPGA module connects, and the input of amplification circuit module is connected with DAC module；Output interface module is defeated with amplification circuit module
Go out end connection, the input of current monitoring module is connected with the outfan of amplification circuit module, the input of voltage monitoring module
It is connected with the outfan of amplification circuit module；The outfan of current monitoring module is connected with ADC one, voltage monitoring module
Outfan is connected with ADC two；Power module is connected with FPGA module, and clock module is connected with the FPGA module.
Preferably, FPGA module is provided with adc data receiving unit one, data processing unit one, dual port RAM unit one, takes advantage of
Musical instruments used in a Buddhist or Taoist mass one, FFT arithmetic elements one, dual port RAM unit two, acquisition control unit, window function unit, adc data receiving unit two,
Data processing unit two, dual port RAM unit three, multiplier two, FFT arithmetic elements two, dual port RAM unit four, phase difference value meter
Calculate unit, signal generation unit, frequency control unit, predetermined frequency unit, phase value computing unit one, phase value computing unit
Two, data processing unit one is connected with adc data receiving unit one, and dual port RAM unit one is connected with data processing unit one, takes advantage of
Musical instruments used in a Buddhist or Taoist mass one is connected with dual port RAM unit one, and FFT arithmetic elements one are connected with multiplier one, dual port RAM unit two and FFT computings
Unit one connects, and phase value computing unit one is connected with dual port RAM unit two, and data processing unit two receives single with adc data
Unit two connects, and dual port RAM unit three is connected with data processing unit two, and multiplier two is connected with dual port RAM unit three, FFT fortune
Calculate unit two be connected with multiplier two, dual port RAM unit four is connected with FFT arithmetic elements two, phase value computing unit two with it is double
Mouth ram cell four connects, and phase difference value computing unit is connected respectively with phase value computing unit one, phase value computing unit two,
Frequency control unit is connected with phase difference value computing unit, and signal generation unit is connected with the frequency control unit, and frequency is pre-
If unit is connected with frequency control unit；Window function unit is connected respectively with the multiplier one, multiplier two.
The present invention also provides a kind of sound knife knife bar resonance control method, comprises the following steps：
(1) power-up initializing；
(2) frequency of the output signal of telecommunication is preset；
(3) current monitoring module gathers the current signal of amplification circuit module output and sends into data processing unit one and carries out
Noise filtering, voltage monitoring module gathers the voltage signal of amplification circuit module output and sends into data processing unit two and made an uproar
Sound is filtered；
(4) current signal obtains limited with the voltage signal after filtration after window function unit is multiplied process after filtering
The current signal and voltage signal of long sequence；
(5) current signal of step (4) output carries out fast fourier transform, step (4) output by FFT arithmetic elements one
Voltage signal fast fourier transform is carried out by the FFT arithmetic elements two；
(6) calculation procedure (5) output current and voltage are distinguished by phase value computing unit one, phase value computing unit two
Phase value；
(7) phase contrast of voltage and current is tried to achieve by phase difference value computing unit；
(8) if phase contrast is more than 0, the frequency of output signal is reduced by frequency control unit and step (3) is returned to；Such as
Fruit phase contrast is less than 0, then increase the frequency of output signal by frequency control unit and return to step (3).
Preferably, following steps are specifically included：
(1) power-up initializing；
(2) by the output frequency rated value REF of predetermined frequency unit preset signals, signal generation unit transmits a signal to institute
State DAC module；
(3) current signal of current monitoring module collection amplification circuit module output, and the current signal is sent to into institute
State ADC one to be AD converted, meanwhile, the voltage signal of voltage monitoring module collection amplification circuit module output, and by electricity
Pressure signal is sent to ADC two and is AD converted；
(4) it is I to define ADC one and export to the fed-back current signals of data processing unit onek, data processing unit
By below equation to current feedback signal IkNoise filtering is carried out, fed-back current signals I (t) are obtained；
In formula (1), IkKth for current signal is sampled, and N is sampling number, and I (t) is after noise filtering
Signal；
(5) it is U to define ADC two and export to the feedback voltage signal of data processing unit twok, data processing unit two
By below equation to voltage feedback signal UkNoise filtering is carried out, feedback voltage signal U (t) is obtained；
In formula (2), UkKth for current signal is sampled, and N is sampling number, and U (t) is after noise filtering
Signal；
(6) fed-back current signals I (t) are had with feedback voltage signal U (t) after window function unit is multiplied process
The current signal I of limit for length's sequencew(t) and voltage signal UwT (), window function Processing Algorithm is as follows：
It is to the computing formula of I (t) windowing processes：
Iw(t)=I (t) wn(t) (3)
It is to the computing formula of U (t) windowing processes：
Uw(t)=U (t) wn(t) (4)
Wherein wnT () is window function, be defined as follows：
(7) the current signal I after windowing processwT () carries out quick Fourier by FFT arithmetic elements one by below equation
Leaf transformation：
In formula (6), Re (Iw(ω) it is) real part of the current signal after FFT, Im (Iw(ω) it is) electric current letter
Imaginary part number after FFT；
Voltage signal U after windowing processwT () carries out quick Fu by the FFT arithmetic elements two by below equation
Vertical leaf transformation：
In formula (7), Re (Uw(ω) it is) real part of the voltage signal after FFT, Im (Uw(ω) it is) voltage letter
Imaginary part number after FFT；
(8) phase value of phase value computing unit one, the difference calculating current of phase value computing unit two and voltage, calculates public
Formula is as follows：
Current phase is：
Voltage-phase is：
(9) further the phase contrast of voltage and current tried to achieve by below equation by phase difference value computing unit：
(10) by frequency control unit pairJudged, ifFollowing steps (12) are then entered, is otherwise entered
Next step (11)；
(11) ifThe frequency of output signal is reduced by frequency control unit and step (4) is returned to；Otherwise by
The frequency of frequency control unit increase output signal simultaneously returns to step (4)；
(12) control terminates.
The invention has the beneficial effects as follows, using FPGA (Field Programmable Gate Array, field-programmable
Gate array) technology, Digital Signal Processing, high-precision adc technology, the present invention is able to ensure that at ultrasound knife knife bar and point of a knife
In resonant operational state, noise inhibiting ability is strong, and control accuracy is high, so as to improve the precision and efficiency of cutting.
Further aspect of the present invention and aspect, by the description below with reference to the specific embodiment of accompanying drawing, are able to
It is clearly stated that.
Description of the drawings
Fig. 1 is ultrasound knife equivalent-circuit model；
Fig. 2 is the theory diagram of the present invention；
Fig. 3 is the theory diagram of FPGA module；
Fig. 4 is control process flow chart.
Symbol description in figure：
1.FPGA modules；2.DAC modules；3.ADC modules one；4. amplification circuit module；5. current monitoring module；6. power supply
Module；7. clock module；8. output interface module；9.ADC modules two；10. voltage monitoring module；11.ADC data receipt units
One；12. data processing units one；13. dual port RAM units one；14. multipliers one；15.FFT arithmetic elements one；16. dual port RAMs
Unit two；17. acquisition control units；18. window function units；19.ADC data receipt units two；20. data processing units two；
21. dual port RAM units three；22. multipliers two；23.FFT arithmetic elements two；24. dual port RAM units four；25. phase difference value meters
Calculate unit；26. signal generation units；27. frequency control units；28. predetermined frequency units；29. phase value computing units one；
30. phase value computing units two.
Specific embodiment
Referring to the drawings, the present invention is described in further detail with specific embodiment.
As shown in Fig. 2 ultrasound knife cutter head resonance control apparatus include FPGA module 1, DAC module 2, ADC 1, put
Big circuit module 4, current monitoring module 5, power module 6, clock module 7, output interface module 8, ADC 29 and voltage
Monitoring modular 10, DAC module 2 is connected with FPGA module 1, and ADC 1 is connected with FPGA module 1, ADC 29 and FPGA
Module 1 connects.The input of amplification circuit module 4 is connected with DAC module 2.Three tunnels of the outfan of amplification circuit module 4 point, one
Road is connected with output interface module 8, and the second tunnel is connected with the input of current monitoring module 5, the 3rd tunnel and voltage monitoring module
10 input connection.The outfan of current monitoring module 5 is connected with ADC 1, the outfan of voltage monitoring module 10 with
ADC 29 connects.
Power module 6 is connected with FPGA module 1, and clock module 7 is connected with FPGA module 1.Power module 6 is also given simultaneously when
Clock module 7, DAC module 2, ADC 1, ADC 29, amplification circuit module 4, current monitoring module 5, voltage monitoring mould
Block 10, output interface module 8 are powered.
Output interface module 8 be used for by electric signal output to ultrasound knife driving handle.
FPGA module 1 presets specified electric signal output rated value, and under the control of FPGA module 1, amplification circuit module 4 is defeated
The signal of telecommunication for going out is sent to the driving handle of ultrasound knife by output interface module 8, so that electric energy is converted into mechanical energy.Electric current is supervised
Surveying module 5 is used to gather the current signal size of the output of amplification circuit module 4, and the current signal for collecting is through ADC 1
It is converted into digital signal and feeds back to FPGA module 1.Voltage monitoring module 10 is used to gather the voltage letter of the output of amplification circuit module 4
Number size, the voltage signal for collecting is converted into digital signal and feeds back to FPGA module 1 through ADC 29.FPGA module 1
Size of current, voltage swing and preset value according to feedback is compared to adjust the big of the output signal of telecommunication of amplification circuit module 4
It is little.
As shown in figure 3, FPGA module 1 is provided with adc data receiving unit 1, data processing unit 1, dual port RAM list
Unit one 13, multiplier 1, FFT arithmetic elements 1, dual port RAM unit 2 16, acquisition control unit 17, window function unit
18th, adc data receiving unit 2 19, data processing unit 2 20, dual port RAM unit 3 21, multiplier 2 22, FFT computing lists
Unit 2 23, dual port RAM unit 4 24, phase difference value computing unit 25, signal generation unit 26, frequency control unit 27, frequency
Default unit 28, phase value computing unit 1, phase value computing unit 2 30.Data processing unit 1 connects with adc data
Receive unit 1 to connect, dual port RAM unit 1 is connected with data processing unit 1, multiplier 1 and dual port RAM unit
One 13 connections, FFT arithmetic elements 1 are connected with multiplier 1, and dual port RAM unit 2 16 connects with FFT arithmetic elements 1
Connect, phase value computing unit 1 is connected with dual port RAM unit 2 16.Data processing unit 2 20 and adc data receiving unit
2 19 connections, dual port RAM unit 3 21 is connected with data processing unit 2 20, and multiplier 2 22 connects with dual port RAM unit 3 21
Connect, FFT arithmetic elements 2 23 are connected with multiplier 2 22, dual port RAM unit 4 24 is connected with FFT arithmetic elements 2 23, phase place
Value computing unit 2 30 is connected with dual port RAM unit 4 24.Phase difference value computing unit 25 respectively with phase value computing unit one
29th, phase value computing unit 2 30 connects, and frequency control unit 27 is connected with phase difference value computing unit 25, signal generation unit
26 are connected with frequency control unit 27.Predetermined frequency unit 28 is connected with frequency control unit 27.
Window function unit 18 is connected respectively with multiplier 1, multiplier 2 22.
Acquisition control unit 17 connects for controlling adc data receiving unit 1, data processing unit one 12, adc data
Receive unit 2 19, data processing unit 2 20 to work.
Adc data receiving unit 1 is used to receive the current signal of the transmission of ADC 1, adc data receiving unit two
19 are used to receive the voltage signal of the transmission of ADC 29.
The phase contrast of the voltage and current signal that the effect of frequency control unit 27 is exported according to phase difference value computing unit 25
The frequency of adjustment output signal, if voltage-phase is ahead of electric current, reduces the frequency of output signal, otherwise rises height output letter
Number frequency.
The effect of signal generation unit 26 is the frequency value output signal according to the setting of frequency control unit 27.
As shown in figure 4, control amplification circuit module 4 is as follows the step of exporting the frequency of the signal of telecommunication：
(1) power-up initializing of each functional unit of finishing device.
(2) by the output frequency rated value REF of the preset signals of predetermined frequency unit 28, the conveying signal of signal generation unit 26
To DAC module 2.
(3) current signal of the collection of current monitoring module 5 amplification circuit module 4 output, and the current signal is sent to
ADC 1 is AD converted.Meanwhile, the voltage signal of the collection output of amplification circuit module 4 of voltage monitoring module 10, and will
Voltage signal is sent to ADC 29 and is AD converted.
(4) it is I to define ADC 1 and export to the fed-back current signals of data processing unit 1k, data processing list
The current feedback signal I that one 12 pairs of ADCs 1 of unit sendkNoise filtering is carried out, high-quality fed-back current signals I is obtained
(t)。
Noise filtering algorithm is completed by below equation：
In formula (1), IkKth for current signal is sampled, and N is sampling number, and I (t) is after noise filtering
Signal.
(5) it is U to define ADC 29 and export to the feedback voltage signal of data processing unit 2 20k, data processing list
The voltage feedback signal U that 2 20 pairs of ADCs 29 of unit sendkNoise filtering is carried out, high-quality feedback voltage signal U is obtained
(t)。
Noise filtering algorithm is completed by below equation：
In formula (2), UkKth for current signal is sampled, and N is sampling number, and U (t) is after noise filtering
Signal.
(6) fed-back current signals I (t) are obtained with feedback voltage signal U (t) after window function unit 18 is multiplied process
The current signal I of finite length sequencew(t) and voltage signal UwT (), window function Processing Algorithm is as follows：
It is to the computing formula of I (t) windowing processes：
Iw(t)=I (t) wn(t) (3)
It is to the computing formula of U (t) windowing processes：
Uw(t)=U (t) wn(t) (4)
Wherein wnT () is window function, be defined as follows：
(7) the current signal I after windowing processwT () carries out quick Fu by FFT arithmetic elements 1 by below equation
Vertical leaf transformation.
In formula (6), Re (Iw(ω) it is) real part of the current signal after FFT, Im (Iw(ω) it is) electric current letter
Imaginary part number after FFT.
Voltage signal U after windowing processwT () carries out quick Fourier by FFT arithmetic elements 2 23 by below equation
Leaf transformation.
In formula (7), Re (Uw(ω) it is) real part of the voltage signal after FFT, Im (Uw(ω) it is) voltage letter
Imaginary part number after FFT.
(8) phase value of phase value computing unit 1, the difference calculating current of phase value computing unit 2 30 and voltage, meter
Calculate formula as follows：
Current phase is：
Voltage-phase is：
(9) further the phase contrast of voltage and current tried to achieve by below equation by phase difference value computing unit 25：
(10) by frequency control unit 27 pairsJudged, ifRepresent that ultrasound knife knife bar is in resonance shape
State, then into step (12), otherwise into next step (11).
(11) ifThe frequency of output signal is reduced by frequency control unit 27 and step (4) is returned to；Otherwise
The frequency of output signal is increased by frequency control unit 27 and step (4) is returned to.
(12) control terminates, and does not make any adjustments.
The above is not limited to the present invention only to the preferred embodiments of the present invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.Every claim in the present invention is done in the range of limiting
Any modification, equivalent substitution and improvements etc., all should be within protection scope of the present invention.
Claims (4)
1. a kind of ultrasound knife knife bar resonance control apparatus, is characterized in that, including FPGA module, DAC module, ADC one, ADC
Module two, amplification circuit module, current monitoring module, voltage monitoring module, power module, clock module and output interface mould
Block, the DAC module is connected with the FPGA module, and the ADC one is connected with the FPGA module, the ADC
Two are connected with the FPGA module, and the input of the amplification circuit module is connected with the DAC module；The output interface mould
Block is connected with the outfan of the amplification circuit module, input and the amplification circuit module of the current monitoring module
Outfan connects, and the input of the voltage monitoring module is connected with the outfan of the amplification circuit module；The electric current prison
The outfan for surveying module is connected with the ADC one, and outfan and the ADC two of the voltage monitoring module connect
Connect；The power module is connected with the FPGA module, and the clock module is connected with the FPGA module.
2. ultrasound knife knife bar resonance control apparatus according to claim 1, it is characterised in that the FPGA module is provided with
Adc data receiving unit one, data processing unit one, dual port RAM unit one, multiplier one, FFT arithmetic elements one, dual port RAM
Unit two, acquisition control unit, window function unit, adc data receiving unit two, data processing unit two, dual port RAM unit
3rd, multiplier two, FFT arithmetic elements two, dual port RAM unit four, phase difference value computing unit, signal generation unit, frequency control
Unit processed, predetermined frequency unit, phase value computing unit one, phase value computing unit two, the data processing unit one and institute
The connection of adc data receiving unit one is stated, the dual port RAM unit one is connected with the data processing unit one, the multiplier
One is connected with the dual port RAM unit one, and the FFT arithmetic elements one are connected with the multiplier one, the dual port RAM unit
Two are connected with the FFT arithmetic elements one, and the phase value computing unit one is connected with dual port RAM unit two, at the data
Reason unit two is connected with the adc data receiving unit two, and the dual port RAM unit three connects with the data processing unit two
Connect, the multiplier two is connected with the dual port RAM unit three, the FFT arithmetic elements two are connected with the multiplier two, institute
State dual port RAM unit four to be connected with the FFT arithmetic elements two, the phase value computing unit two connects with dual port RAM unit four
Connect, the phase difference value computing unit is connected respectively with the phase value computing unit one, phase value computing unit two, the frequency
Rate control unit is connected with the phase difference value computing unit, and the signal generation unit is connected with the frequency control unit,
The predetermined frequency unit is connected with frequency control unit；The window function unit respectively with the multiplier one, multiplier two
Connection.
3. a kind of control method using ultrasound knife knife bar resonance control apparatus as claimed in claim 2, it is characterised in that bag
Include following steps：
(1) power-up initializing；
(2) frequency of the output signal of telecommunication is preset；
(3) the current monitoring module gathers the current signal of amplification circuit module output and sends into data processing unit one and carries out
Noise filtering, the voltage monitoring module gathers the voltage signal of amplification circuit module output and sends into data processing unit two
Row noise is filtered；
(4) current signal obtains limited with the voltage signal after filtration after the window function unit is multiplied process after filtering
The current signal and voltage signal of long sequence；
(5) current signal of step (4) output carries out fast fourier transform, the step by the FFT arithmetic elements one
Suddenly the voltage signal of (4) output carries out fast fourier transform by the FFT arithmetic elements two；
(6) step (5) output current and electricity are calculated respectively by the phase value computing unit one, phase value computing unit two
The phase value of pressure；
(7) phase contrast of voltage and current is tried to achieve by the phase difference value computing unit；
(8) if phase contrast is more than 0, the frequency of output signal is reduced by frequency control unit and step (3) is returned to；If phase
Potential difference is less than 0, then increase the frequency of output signal by frequency control unit and return to step (3).
4. control method according to claim 3, it is characterised in that specifically include following steps：
(1) power-up initializing；
(2) by the output frequency rated value REF of the predetermined frequency unit preset signals, signal generation unit transmits a signal to institute
State DAC module；
(3) current signal of the current monitoring module collection amplification circuit module output, and the current signal is sent to into institute
State ADC one to be AD converted, meanwhile, the voltage signal of the voltage monitoring module collection amplification circuit module output, and
Voltage signal is sent to into the ADC two to be AD converted；
(4) it is I to define the ADC one and export to the fed-back current signals of data processing unit onek, the data processing list
Unit one is by below equation to current feedback signal IkNoise filtering is carried out, fed-back current signals I (t) are obtained；
In formula (1), IkKth for current signal is sampled, and N is sampling number, and I (t) is the letter after noise filtering
Number；
(5) it is U to define the ADC two and export to the feedback voltage signal of data processing unit twok, the data processing list
Unit two is by below equation to voltage feedback signal UkNoise filtering is carried out, feedback voltage signal U (t) is obtained；
In formula (2), UkKth for current signal is sampled, and N is sampling number, and U (t) is the letter after noise filtering
Number；
(6) fed-back current signals I (t) are had with feedback voltage signal U (t) after window function unit is multiplied process
The current signal I of limit for length's sequencew(t) and voltage signal UwT (), window function Processing Algorithm is as follows：
It is to the computing formula of I (t) windowing processes：
Iw(t)=I (t) wn(t) (3)
It is to the computing formula of U (t) windowing processes：
Uw(t)=U (t) wn(t) (4)
Wherein wnT () is window function, be defined as follows：
(7) the current signal I after windowing processwT () carries out quick Fourier by the FFT arithmetic elements one by below equation
Leaf transformation：
In formula (6), Re (Iw(ω) it is) real part of the current signal after FFT, Im (Iw(ω)) it is current signal Jing
The imaginary part crossed after FFT；
Voltage signal U after windowing processwT () carries out fast Flourier change by the FFT arithmetic elements two by below equation
Change：
In formula (7), Re (Uw(ω) it is) real part of the voltage signal after FFT, Im (Uw(ω)) it is voltage signal Jing
The imaginary part crossed after FFT；
(8) phase value of the phase value computing unit one, the difference calculating current of phase value computing unit two and voltage, calculates public
Formula is as follows：
Current phase is：
Voltage-phase is：
(9) further the phase contrast of voltage and current tried to achieve by below equation by phase difference value computing unit：
(10) by frequency control unit pairJudged, ifFollowing steps (12) are then entered, otherwise into next
Step (11)；
(11) ifThe frequency of output signal is reduced by frequency control unit and step (4) is returned to；Otherwise by frequency
The frequency of control unit increase output signal simultaneously returns to step (4)；
(12) control terminates.
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| CN103027748A (en) * | 2011-10-03 | 2013-04-10 | 伊西康内外科公司 | Ultrasonic device for cutting and coagulating with stepped output |
| CN103222892A (en) * | 2012-01-27 | 2013-07-31 | 科维蒂恩有限合伙公司 | Systems and methods for phase predictive impedance loss model calibration and compensation |
| WO2015094748A1 (en) * | 2013-12-16 | 2015-06-25 | Ethicon Endo-Surgery, Inc. | Medical device |
| CN205947839U (en) * | 2016-06-23 | 2017-02-15 | 山东威瑞外科医用制品有限公司 | Ultrasonic knife cutter arbor resonance controlling means |
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