CN106140592A - Digital ultrasonic generator and auto frequency locking method thereof - Google Patents
Digital ultrasonic generator and auto frequency locking method thereof Download PDFInfo
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- CN106140592A CN106140592A CN201610611587.9A CN201610611587A CN106140592A CN 106140592 A CN106140592 A CN 106140592A CN 201610611587 A CN201610611587 A CN 201610611587A CN 106140592 A CN106140592 A CN 106140592A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
- B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
- B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
- B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
- B06B1/0207—Driving circuits
- B06B1/0223—Driving circuits for generating signals continuous in time
- B06B1/0269—Driving circuits for generating signals continuous in time for generating multiple frequencies
- B06B1/0276—Driving circuits for generating signals continuous in time for generating multiple frequencies with simultaneous generation, e.g. with modulation, harmonics
Abstract
The invention discloses current waveform and the voltage waveform at a kind of digital ultrasonic generator isolated measurement transducer load two ends, gather is the current signal under effective power and voltage signal, by above signal from motion tracking frequency, it is possible to accurately find out resonant frequency.Voltage waveform and current waveform are carried out multiplication calculating, the size of the DC waveform obtained directly reflects the phase difference φ size of voltage current waveform, Δ φ is the least, then explanation transducer is closer to pure resistance, and transducer efficiency eta is the biggest, and its frequency of oscillation is closer to optimum resonance point, make transducer loaded work piece in resonant condition, thus improve the conversion efficiency of ultrasonic transducer, reduce inductance and the caloric value of transformator, thus improve stability and the high efficiency of electric current.
Description
Technical field
The present invention relates to supersonic generator, more particularly to a kind of digital ultrasonic generator and automatically lock
Frequency method.
Background technology
Supersonic generator is the important component part of ultrasonic device, is responsible for and provides supersonic frequency electric energy to ultrasonic transducer
Effect.In order to make the high-frequency work of ultrasonic transducer and play the superiority of Ultrasonic machining, it is desirable to vibrational system is operated in
Resonant condition.Before general transducer vibrations system work, system can be met by the electric frequency of regulation power supply and be in resonance
Working condition.But in reality is processed, due to the impression of the series of factors such as the change loaded, system heat generation, make vibration system
The natural frequency of system changes, if adjusting the supply frequency of transducer the most not in time, vibrational system would operate in disresonance
State, so that its output amplitude reduces, work quality declines, and when off resonance is serious, also can damage ultrasonic equipment.
In order to make supersonic generator to work under resonance condition, supersonic generator can arrange automatic frequency tracking
Circuit.So-called automatic frequency tracking refers under the influence of extraneous factor when eigentone changes, control system energy
Natural frequency after finding change immediately the natural frequency after adjusting frequency of supply in time and changing identical make vibrational system begin
It is operated in resonant condition eventually, to maintain the peak swing of vibrational system.At present, the method for supersonic generator auto frequency locking also has
Multiple.State Intellectual Property Office discloses Patent No. ZL2007100736316, and patent name is digital ultrasonic generator
Patent of invention, this digital ultrasonic generator is to find maximum current point according to the principle of " single variable linear planning ".
If I (input current of half-bridge inversion circuit) is intended to the target found, f (frequency of supersonic generator) is the factor of impact.
First f is divided in allowed limits some equal portions, to draw the push-in stroke △ f controlling f process.Assume that original state is at f1
Place, obtains the I1 of correspondence by measurement；Then f pushes ahead to f2, can arrive again I2；Then the size of I2 Yu I1 is compared, if I2 >
I1, then it represents that I is increasing.Now, it is pushed further into along former direction to f3 (corresponding I3), the most constantly carries out, until f4 is (corresponding
I4), time, if being further advanced into f5 (corresponding I5), it can be seen that now I5 < I4, i.e. I value have dropped, this explanation
Control to have exceeded extreme point, now should change former direction of propulsion, i.e. reverse propulsion and find resonant frequency.Surpassing of this kind of prior art
The method of sonic generator auto frequency locking has the disadvantage that
The electric current I of sampling is the input current of half-bridge inversion circuit, is the alternating current of civil power 220V end, this alternating current
Stream is containing substantial amounts of high-frequency noise, and the size simply entering power that the size of input current is reflected, can not be accurate
Reflection output is to the size of the effective power of ultrasonic transducer.
The resonant frequency of the method locking of the supersonic generator auto frequency locking of prior art makes the defeated of half-bridge inversion circuit
Enter electric current and reach maximum, i.e. general power PAlwaysReach maximum.And according to conversion efficiency factorη is the biggest, then surpass
Acoustic wave transducer conversion efficiency is the highest, and its frequency of oscillation is closer to optimum resonance point.If general power PAlwaysVery big, but η is the least, then change
Effective power P of energy deviceEffectivelyThe least, illustrate that major part power consumption is on inductance and transformator.So, sampling semi-bridge inversion electricity
The input current on road cannot correctly lock resonant frequency, and therefore, ultrasonic transducer just cannot be operated in resonant condition, from
And affect the conversion efficiency of ultrasonic transducer, cause and on inductance and transformator, produce substantial amounts of heat, have impact on the steady of circuit
Qualitative and efficiency.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of digital ultrasonic generator, and this digital type ultrasound wave is sent out
Raw device frequency locking is more accurate, makes ultrasonic transducer can be operated in resonant condition, thus improves the conversion effect of ultrasonic transducer
Rate, enables the circuitry to more stably and efficiently work.
The technical solution of the present invention is to provide a kind of digital ultrasonic generator with following structure, including
Control unit, high-frequency inverter circuit, automatic frequency sweep frequency locking control unit, vibration and drive circuit, impedance matching circuit and transducing
Device loads；Described control unit is connected with described automatic frequency sweep frequency locking control unit, and described automatic frequency sweep frequency locking controls
Unit is connected with described vibration and drive circuit, and described vibration and drive circuit are connected with described high-frequency inverter circuit；
Described high-frequency inverter circuit is connected with described impedance matching circuit；Described impedance matching circuit is born with described transducer
Carry connect, it is characterised in that: digital ultrasonic generator also include isolation voltage detection module, isolation current detection module and
Voltage, electric current multiplier；The input of described isolation voltage detection module and the described input isolating current detection module
End is connected with described impedance matching circuit respectively；The outfan of described isolation voltage detection module and described isolation electric current
The outfan of detection module two inputs with described voltage, electric current multiplier respectively are connected, and described voltage, electric current are taken advantage of
The outfan of musical instruments used in a Buddhist or Taoist mass is connected with described control unit.
After using above structure, the digital ultrasonic generator of the present invention, compared with prior art, have following excellent
Point:
Current waveform and electricity due to the digital ultrasonic generator of the present invention isolated measurement transducer load two ends
Corrugating, collection is the current signal under effective power and voltage signal, by above signal from motion tracking frequency, it is possible to
Accurately find out resonant frequency.Voltage waveform and current waveform are carried out multiplication calculating, and the size of the DC waveform obtained is the most anti-
Mirroring the phase difference φ size of voltage current waveform, Δ φ is the least, then explanation transducer is changed closer to pure resistance, transducer
Efficiency eta is the biggest, and its frequency of oscillation is closer to optimum resonance point so that transducer loaded work piece is in resonant condition, thus improves
The conversion efficiency of ultrasonic transducer, reduces inductance and the caloric value of transformator, thus improves stability and the high efficiency of electric current.
As improvement, described high-frequency inverter circuit includes high voltage half-bridge control chip, upper brachium pontis metal-oxide-semiconductor and lower brachium pontis
Metal-oxide-semiconductor；Described high voltage half-bridge control chip connects with described vibration and drive circuit, upper brachium pontis metal-oxide-semiconductor and lower brachium pontis metal-oxide-semiconductor
Connecing, described upper brachium pontis metal-oxide-semiconductor and lower brachium pontis metal-oxide-semiconductor are connected with described impedance matching circuit respectively.At high-frequency inversion electric current
In, the most more employing pulsed high-frequency transformator drives half-bridge field effect transistor, when upper and lower bridge ON-OFF in the method
Switching is in a flash, it may occur that the phenomenon that bridge simultaneously turns on up and down, so can form big electric current, although the time simultaneously turned on is non-
The shortest, but upper and lower bridge chip also can be made to generate heat so that this series products cannot longtime running, or need to install big fin and dissipate
Hot-air fan dispels the heat.And the present invention uses high voltage half-bridge control chip drive half-bridge field effect transistor, turn at upper and lower bridge
What cut-off switched adds in a flash certain Dead Time, it is to avoid the phenomenon that upper and lower bridge simultaneously turns on occurs, thus avoids up and down
The situation of bridge chip excessive heating, therefore product can be with longtime running, and without installing large-scale heat dissipation equipment.
As improvement, described high-frequency inverter circuit also includes that the MOSVGS of brachium pontis metal-oxide-semiconductor drives clamping protective circuit
Clamping protective circuit is driven with the MOSVGS of lower brachium pontis metal-oxide-semiconductor；The MOSVGS of described upper brachium pontis metal-oxide-semiconductor drives clamper protection electricity
Road includes the G of diode D201, diode D204 and resistance R205, the anode of described diode D201 and upper brachium pontis metal-oxide-semiconductor
Pole connects, and the negative electrode of described diode D201 is connected with the negative electrode of described diode D204, and described resistance R205 connects
Between the anode and the anode of diode D204 of described diode D201；The MOSVGS of described lower brachium pontis metal-oxide-semiconductor drives
Clamping protective circuit includes diode D206, diode D207 and resistance R213, the anode of described diode D206 and Shang Qiao
The G pole of arm metal-oxide-semiconductor connects, and the negative electrode of described diode D206 is connected with the negative electrode of described diode D207, described electricity
Resistance R213 is connected between anode and the anode of diode D207 of described diode D206.After adopting the structure, upper bridge
The MOSVGS of arm metal-oxide-semiconductor drives the MOSVGS of clamping protective circuit and lower brachium pontis metal-oxide-semiconductor to drive clamping protective circuit to upper brachium pontis
Metal-oxide-semiconductor and lower brachium pontis metal-oxide-semiconductor have protective effect.
As improvement, described high-frequency inverter circuit also includes brachium pontis metal-oxide-semiconductor protection circuit and the protection of lower brachium pontis metal-oxide-semiconductor
Circuit；Described upper brachium pontis metal-oxide-semiconductor protection circuit includes diode D203, resistance R203 and electric capacity C204, described diode
The anode of D203 is connected with the S pole of described upper brachium pontis metal-oxide-semiconductor, the negative electrode of described diode D203 and described upper brachium pontis
The D pole of metal-oxide-semiconductor connects, and one end of described resistance R203 is connected with the D pole of described upper brachium pontis metal-oxide-semiconductor, described resistance
The other end of R203 is connected with one end of described electric capacity C204, the other end of described electric capacity C204 and described upper brachium pontis
The S pole of metal-oxide-semiconductor connects；Described lower brachium pontis metal-oxide-semiconductor protection circuit includes diode D205, resistance R208 and electric capacity C208, institute
The anode of the diode D205 stated is connected with the S pole of described upper brachium pontis metal-oxide-semiconductor, and the negative electrode of described diode D205 is with described
Upper brachium pontis metal-oxide-semiconductor D pole connect, one end of described resistance R208 is connected with the D pole of described upper brachium pontis metal-oxide-semiconductor, described
The other end of resistance R208 be connected with one end of described electric capacity C208, the other end of described electric capacity C208 is upper with described
The S pole of brachium pontis metal-oxide-semiconductor connects.After adopting the structure, upper brachium pontis metal-oxide-semiconductor protection circuit and lower brachium pontis metal-oxide-semiconductor protection circuit pair
Upper brachium pontis metal-oxide-semiconductor and lower brachium pontis metal-oxide-semiconductor have protective effect.
The invention solves the problems that another technical problem is to provide a kind of auto frequency locking method of digital ultrasonic generator,
This auto frequency locking method can find the resonant frequency of supersonic generator accurately and efficiently, makes transducer loaded work piece
Good resonant condition, thus put forward high-power conversion efficiency, enable the circuitry to more stably and efficiently work.
The technical solution of the present invention is to provide the automatic of a kind of digital ultrasonic generator having steps of
Locking method, comprises the following steps:
S1, digital ultrasonic generator initialize program；
The frequency range that S2, described control unit load according to transducer starts setting up frequency from minima；
S3, it is gradually increased frequency, often increases T stabilization time, isolation voltage inspection described after elapsed time T after a frequency
Survey module and gather isolation voltage value and described isolation current detection module collection isolation current value；
S4, by isolation voltage value and isolation current value input described in voltage, electric current multiplier, through described voltage,
Electric current multiplier data are transferred to described control unit after processing, and described control unit calculates the electric current electricity under this frequency
Pressure phase difference value, if current/voltage phase difference value diminishes, then returns step S3；Otherwise, step S5 is entered；
S5, continuation increase frequency, it is judged that whether current/voltage phase difference value continues to become big, the most then the frequency of setting at present
Rate is more than optimum frequency resonance point, is gradually reduced frequency；If it is not, then return step S4；
S6, reducing during frequency, if current/voltage phase difference value diminishes, then continuing to be gradually reduced frequency；If it is electric
Stream voltage-phase difference becomes big, and this frequency corresponding to current/voltage phase contrast is exactly optimum frequency resonance point.
After using above structure, the auto frequency locking method of the digital ultrasonic generator of the present invention, with prior art phase
Ratio, has the advantage that
Due to the present invention digital ultrasonic generator auto frequency locking method collection be transducer load two ends
Current waveform and voltage waveform, directly reflect is the size of effective power, and signals collecting is relatively effective, again according to current/voltage phase
Potential difference is the least, illustrate transducer closer to pure resistance, transducer efficiency eta is the biggest, and its frequency of oscillation is closer to the most humorous
Foundation a little of shaking finds resonant frequency such that it is able to accurately find out resonant frequency.And pass through the digital ultrasonic of the present invention
The efficiency that the auto frequency locking method of wave producer carries out frequency locking is higher, and supersonic generator can accurately and the most efficiently be found out super
The resonant frequency of sonic generator.
As improvement, in step s 4, the method for calculating current voltage-phase difference comprises the following steps: S41, isolation electricity
Current value is input to voltage, electric current is taken advantage of with isolation by the isolation voltage value detected for pressure detection module and isolation current detection module
The input of musical instruments used in a Buddhist or Taoist mass calculates, and result of calculation voltage, the outfan of electric current multiplier obtain direct current after capacitor filtering and divide
Amount；S42, described DC component obtain current/voltage phase difference value after carrying out arc cosine computing by control unit.Use this
After planting structure, the method for calculating current voltage-phase difference is simple and reliable.
As improvement, in step s3, the isolation voltage value collected and isolation current value are carried out signal condition filtering,
Obtain isolation voltage value and isolation current value accurately.After adopting the structure so that isolation voltage value and isolation current value are more
Add precisely.
As improvement, in step s3, it is the first one step to arrange certain frequency, by often increasing by the first one step
Mode be gradually increased frequency.After adopting the structure, increase frequency more regular, be conducive to accurately finding optimum frequency humorous
Shake a little.
As improvement, in step s 5, it is the second one step to arrange certain frequency, by often increasing by the second one step
Mode continue increase frequency；Described n times that the second one step is the first one step and 2 < n < 5.Use this kind of knot
After structure, at this moment by the method for increasing one step it can be avoided that erroneous judgement occurs, i.e. worked due to supersonic generator
Cheng Zhong, can there is the phenomenon of burr in waveform, strengthen one step and may be determined whether that the change encountering burr is looked for greatly or really
Arrive optimum resonant frequency, so that automatic frequency sweep work is relatively reliable.
As improvement, in step s 5, in the way of often reducing the first one step, it is gradually reduced frequency.Use this kind
After structure, reduce frequency more regular, be conducive to accurately finding optimum frequency resonance point.
Accompanying drawing explanation
Fig. 1 is the circuit block diagram of the digital ultrasonic generator of the present invention.
Fig. 2 is the partial circuit schematic diagram of the digital ultrasonic generator of the present invention.
Fig. 3 is the flow chart of the digital ultrasonic generator auto frequency locking method of the present invention.
Fig. 4 is the oscillogram of the high-frequency inverter circuit of the digital ultrasonic generator of prior art.
Fig. 5 is the oscillogram of the high-frequency inverter circuit of the digital ultrasonic generator of the present invention.
Fig. 6 is the voltage and current waveform at the transducer load two ends of the digital ultrasonic generator of prior art.
Fig. 7 is the voltage and current waveform at the transducer load two ends of the digital ultrasonic generator of the present invention.
Detailed description of the invention
The invention will be further described with specific embodiment below in conjunction with the accompanying drawings.
Refer to shown in Fig. 1, the digital ultrasonic generator of the present invention, including control unit, high-frequency inverter circuit, from
Dynamic frequency sweep frequency locking control unit, vibration and drive circuit, impedance matching circuit and transducer load；Described control unit and institute
The automatic frequency sweep frequency locking control unit stated connects, described automatic frequency sweep frequency locking control unit and described vibration and drive circuit
Connecting, described vibration and drive circuit are connected with described high-frequency inverter circuit；Described high-frequency inverter circuit is with described
Impedance matching circuit connects；Described impedance matching circuit is connected with the load of described transducer, it is characterised in that: digital super
Sonic generator also includes isolation voltage detection module, isolation current detection module and voltage, electric current multiplier；Described isolation
The input of the input of voltage detection module and described isolation current detection module respectively with described impedance matching circuit
Connect；The outfan of described isolation voltage detection module and the described outfan isolating current detection module are respectively with described
Voltage, two inputs of electric current multiplier connect, described voltage, the outfan of electric current multiplier and described control list
Unit connects.
Seeing also shown in Fig. 2, P201～P204 forms transducer load circuit with ultrasonic transducer；
Impedance matching circuit described in T201, L201, C207, R210 composition；Wherein T201 is the transformator of transducer, real
Existing energy isolation translation function；C207 Yu R210 is transformator filter protective circuit, it is achieved filter spike on transformator
Function；L201 is the impedance matching inductance of transducer, it is achieved the impedance matching effect of transducer；
U202, U204, U208 are high speed photo couplings, and its peripheral circuit composition photoelectric-isolated oscillating circuit, are used for realizing
Phototube Coupling, it is to avoid controller signals lost efficacy；
Isolation current detection circuit described in U201 and R212 composition, wherein U201 is HF current transformer, it is achieved electricity
The isolated detection of stream waveform.
Isolation voltage testing circuit described in U206, U207 and its peripheral circuit composition, it is achieved voltage waveform isolated
Detection；Wherein U207 is high frequency voltage transformer；U206 is high-operational amplifier amplifier, forms second-order low-pass filter circuit, by
Contain substantial amounts of high-frequency noise in voltage waveform, after second-order low-pass filter circuit, eliminate high-frequency noise, make voltage signal
More reliable and more stable.
Voltage described in U209 and U205 composition, electric current multiplier, can obtain voltage current waveform by mathematical formulae
Phase contrast；Wherein U209 is analog multiplier；U205 is high-precision voltage-reference, it is provided that the voltage x current of 2.5V is sinusoidal
The direct current central point of waveform.
U203, Q201, Q203 form high-frequency inverter circuit with its peripheral circuit；High-frequency inverter circuit includes high voltage half-bridge control
Coremaking sheet U203, upper brachium pontis metal-oxide-semiconductor Q201 and lower brachium pontis metal-oxide-semiconductor Q203；Described high voltage half-bridge control chip U203 is with described
Vibration and drive circuit, upper brachium pontis metal-oxide-semiconductor Q201 and lower brachium pontis metal-oxide-semiconductor Q203 connect, described upper brachium pontis metal-oxide-semiconductor Q201 and
Lower brachium pontis metal-oxide-semiconductor Q203 is connected with described impedance matching circuit respectively.Described high-frequency inverter circuit also includes brachium pontis MOS
The MOSVGS of pipe drives the MOSVGS of clamping protective circuit and lower brachium pontis metal-oxide-semiconductor to drive clamping protective circuit；Described upper brachium pontis
The MOSVGS of metal-oxide-semiconductor drives clamping protective circuit to include diode D201, diode D204 and resistance R205, described diode
The anode of D201 is connected with the G pole of upper brachium pontis metal-oxide-semiconductor, the negative electrode of described diode D201 and the moon of described diode D204
Pole connects, and described resistance R205 is connected between anode and the anode of diode D204 of described diode D201；Described
Lower brachium pontis metal-oxide-semiconductor MOSVGS drive clamping protective circuit include diode D206, diode D207 and resistance R213, described
The anode of diode D206 be connected with the G pole of upper brachium pontis metal-oxide-semiconductor, the negative electrode of described diode D206 and described diode
The negative electrode of D207 connects, described resistance R213 be connected to the anode of described diode D206 and diode D207 anode it
Between.Described high-frequency inverter circuit also includes brachium pontis metal-oxide-semiconductor protection circuit and lower brachium pontis metal-oxide-semiconductor protection circuit；Described is upper
Brachium pontis metal-oxide-semiconductor protection circuit includes diode D203, resistance R203 and electric capacity C204, the anode of described diode D203 and institute
The S pole of the upper brachium pontis metal-oxide-semiconductor stated connects, and the negative electrode of described diode D203 is connected with the D pole of described upper brachium pontis metal-oxide-semiconductor,
One end of described resistance R203 is connected with the D pole of described upper brachium pontis metal-oxide-semiconductor, and the other end of described resistance R203 is with described
Electric capacity C204 one end connect, the other end of described electric capacity C204 is connected with the S pole of described upper brachium pontis metal-oxide-semiconductor；Described
Lower brachium pontis metal-oxide-semiconductor protection circuit include diode D205, resistance R208 and electric capacity C208, the anode of described diode D205
Being connected with the S pole of described upper brachium pontis metal-oxide-semiconductor, the negative electrode of described diode D205 connects with the D pole of described upper brachium pontis metal-oxide-semiconductor
Connecing, one end of described resistance R208 is connected with the D pole of described upper brachium pontis metal-oxide-semiconductor, the other end of described resistance R208 with
One end of described electric capacity C208 connects, and the other end of described electric capacity C208 is connected with the S pole of described upper brachium pontis metal-oxide-semiconductor.
C201, R201 and C211 and R214 are the center voltage point of upper and lower bridge respectively, it is achieved the balance of voltage waveform on upper and lower bridge arm.
Fig. 4 is the oscillogram of the high-frequency inverter circuit of the digital ultrasonic generator of prior art, it can be clearly seen that
Drive waveforms contains substantial amounts of spike burr, and with crossing the signal rushed, and upper brachium pontis waveform and lower brachium pontis waveform exist certain
The overlapping region of time, this can make upper and lower bridge arm metal-oxide-semiconductor simultaneously turn in this section of overlapping region, forms upper and lower bridge arm short circuit,
Metal-oxide-semiconductor is made to produce the phenomenon of heating.
Fig. 5 is the oscillogram of the high-frequency inverter circuit of the digital ultrasonic generator of the present invention, as can be seen from the figure
Drive waveforms does not contains substantial amounts of spike burr, without crossing the signal of punching, and when upper brachium pontis and lower brachium pontis exist certain dead band
Between, there is not overlapping region, therefore, upper and lower bridge arm metal-oxide-semiconductor will not simultaneously turn on, and there is not metal-oxide-semiconductor and produces heating because of short circuit
Phenomenon.
The auto frequency locking method of the digital ultrasonic generator of the present invention, comprises the following steps:
S1, digital ultrasonic generator initialize program；
The frequency range that S2, described control unit load according to transducer starts setting up frequency from minima；
S3, it is the first one step to arrange certain frequency, is gradually increased frequency, often increase first one step
T stabilization time after frequency, isolation voltage detection module described after elapsed time T gathers isolation voltage value and described isolation electricity
Stream detection module collection isolation current value；The isolation voltage value collected and isolation current value are carried out signal condition filtering,
To isolation voltage value accurately and isolation current value.
S4, by isolation voltage value and isolation current value input described in voltage, electric current multiplier, through described voltage,
Electric current multiplier data are transferred to described control unit after processing, and described control unit calculates the electric current electricity under this frequency
Pressure phase difference value, if current/voltage phase difference value diminishes, then returns step S3；Otherwise, step S5 is entered；Calculating current voltage phase
The method of potential difference value comprises the following steps:
S41, isolation voltage detection module and isolation current detection module are by the isolation voltage value detected and isolation electric current
Value is input to voltage, the input of electric current multiplier calculates, and result of calculation voltage, the outfan of electric current multiplier pass through electricity
DC component is obtained after capacitor filter；
S42, described DC component obtain current/voltage phase difference value after carrying out arc cosine computing by control unit.
S5, increase the frequency of the second one step, described n times that second one step is the first one step and 2 < n <
5.Judge whether current/voltage phase difference value continues to become big, the frequency arranged the most at present is more than optimum frequency resonance point, just
It is gradually reduced frequency with the first one step；If it is not, then return step S4；
S6, reducing during frequency, if current/voltage phase difference value diminishes, then continuing with the first one step gradually
Reduce frequency；If current/voltage phase difference value becomes big, this frequency corresponding to current/voltage phase contrast is exactly optimum frequency resonance
Point.
The foundation of the digital ultrasonic generator auto frequency locking method of the present invention is as follows:
It is U=U that isolation voltage detection module obtains voltagemcos(ωt+φu), the electric current that isolation current detection module obtains
For I=Imcos(ωt+φi), wherein UmBeing voltage amplitude, ω is the angular frequency of waveform, φuIt it is the initial phase of voltage waveform
Angle, ImIt is current amplitude, φiIt it is the starting phase angle of current waveform.
Therefore, power P=UI=UmImc o sωt(+φu)c o sωt(+φi), use product to sum formula,cos(2ωt+φu+φi) it is the sine wave of angular frequency 2 ω, waveform
Starting phase angle is φu+φi.And we are it is of concern that cos (φu-φi) part, set Δ φ=φu-φiIt it is exactly voltage electricity
The phase contrast of stream waveform, is steady state value, therefore a cos (φu-φi) it is a DC component.Therefore, power P be exactly withCentered by point, 2 ω are the sine wave of angular frequency.Expect the phase contrast of current-voltage waveform, as long as obtaining
The DC component of function, negates cosine and can be obtained by.
Fig. 6 is the voltage and current waveform at the transducer load two ends of the digital ultrasonic generator of prior art, from
It can be seen that transducer load both end voltage, electric current drive waveforms are the sine waves of a setpoint frequency in figure, but voltage,
There is bigger phase contrast at the phase angle of electric current, it is impossible to is formed and essentially coincides, illustrates that ultrasonic transducer cannot be operated in the most humorous
Shake in dot frequency, and on the waveform of voltage and current, there is bigger spike, easily make ultrasonic transducer cause machine
Tool noise, easily damages transducer, affects service life.
Fig. 7 is the voltage and current waveform at the transducer load two ends of the digital ultrasonic generator of the present invention, from figure
In it can be seen that transducer load both end voltage, electric current drive waveforms are the sine waves of a setpoint frequency, and voltage waveform
With current waveform substantially close to coincidence, illustrating that ultrasonic transducer is operated in specific resonant frequency, this frequency is transducing
The optimum resonance point of device, therefore, can accurately be looked for by the method for the auto frequency locking of the digital ultrasonic generator of the present invention
To the optimum resonance point of ultrasonic transducer load, thus improve the performance of product.
Claims (10)
1. a digital ultrasonic generator, including control unit, high-frequency inverter circuit, automatic frequency sweep frequency locking control unit,
Vibration and drive circuit, impedance matching circuit and transducer load；Described control unit and described automatic frequency sweep frequency locking control
Unit processed connect, described automatic frequency sweep frequency locking control unit is connected with described vibration and drive circuit, described vibration and
Drive circuit is connected with described high-frequency inverter circuit；Described high-frequency inverter circuit is connected with described impedance matching circuit；
Described impedance matching circuit is connected with the load of described transducer, it is characterised in that: digital ultrasonic generator also includes
Isolation voltage detection module, isolation current detection module and voltage, electric current multiplier；Described isolation voltage detection module defeated
Enter end to be connected with described impedance matching circuit respectively with the input of described isolation current detection module；Described isolation electricity
The outfan of the outfan of pressure detection module and described isolation current detection module respectively with described voltage, electric current multiplier
Two inputs connect, described voltage, the outfan of electric current multiplier are connected with described control unit.
Digital ultrasonic generator the most according to claim 1, it is characterised in that: described high-frequency inverter circuit includes
High voltage half-bridge control chip, upper brachium pontis metal-oxide-semiconductor and lower brachium pontis metal-oxide-semiconductor；Described high voltage half-bridge control chip and described vibration
And drive circuit, upper brachium pontis metal-oxide-semiconductor and lower brachium pontis metal-oxide-semiconductor connect, described upper brachium pontis metal-oxide-semiconductor and lower brachium pontis metal-oxide-semiconductor respectively with
Described impedance matching circuit connects.
Digital ultrasonic generator the most according to claim 2, it is characterised in that: described high-frequency inverter circuit also wraps
The MOSVGS including brachium pontis metal-oxide-semiconductor drives the MOSVGS of clamping protective circuit and lower brachium pontis metal-oxide-semiconductor to drive clamping protective circuit；Institute
The MOSVGS of the upper brachium pontis metal-oxide-semiconductor stated drives clamping protective circuit to include diode (D201), diode (D204) and resistance
(R205), the anode of described diode (D201) is connected with the G pole of upper brachium pontis metal-oxide-semiconductor, the moon of described diode (D201)
Pole is connected with the negative electrode of described diode (D204), and described resistance (R205) is connected to the sun of described diode (D201)
Between the anode of pole and diode (D204)；The MOSVGS of described lower brachium pontis metal-oxide-semiconductor drives clamping protective circuit to include two poles
Pipe (D206), diode (D207) and resistance (R213), the anode of described diode (D206) and the G pole of upper brachium pontis metal-oxide-semiconductor
Connecting, the negative electrode of described diode (D206) is connected with the negative electrode of described diode (D207), described resistance (R213)
It is connected between anode and the anode of diode (D207) of described diode (D206).
Digital ultrasonic generator the most according to claim 2, it is characterised in that: described high-frequency inverter circuit also wraps
Include brachium pontis metal-oxide-semiconductor protection circuit and lower brachium pontis metal-oxide-semiconductor protection circuit；Described upper brachium pontis metal-oxide-semiconductor protection circuit includes two poles
Pipe (D203), resistance (R203) and electric capacity (C204), the anode of described diode (D203) and described upper brachium pontis metal-oxide-semiconductor
S pole connects, and the negative electrode of described diode (D203) is connected with the D pole of described upper brachium pontis metal-oxide-semiconductor, described resistance (R203)
One end be connected with the D pole of described upper brachium pontis metal-oxide-semiconductor, the other end of described resistance (R203) and described electric capacity (C204)
One end connect, the other end of described electric capacity (C204) is connected with the S pole of described upper brachium pontis metal-oxide-semiconductor；Described lower brachium pontis
Metal-oxide-semiconductor protection circuit includes diode (D205), resistance (R208) and electric capacity (C208), the anode of described diode (D205)
It is connected with the S pole of described upper brachium pontis metal-oxide-semiconductor, the negative electrode of described diode (D205) and the D pole of described upper brachium pontis metal-oxide-semiconductor
Connecting, one end of described resistance (R208) is connected with the D pole of described upper brachium pontis metal-oxide-semiconductor, described resistance (R208) another
One end is connected with one end of described electric capacity (C208), the other end of described electric capacity (C208) and described upper brachium pontis metal-oxide-semiconductor
S pole connect.
5. an auto frequency locking method for digital ultrasonic generator, comprises the following steps:
S1, digital ultrasonic generator initialize program；
The frequency range that S2, described control unit load according to transducer starts setting up frequency from minima；
S3, it is gradually increased frequency, often increases T stabilization time, isolation voltage detection mould described after elapsed time T after a frequency
Block gathers isolation voltage value and described isolation current detection module collection isolation current value；
S4, the voltage by described in isolation voltage value and isolation current value input, electric current multiplier, through described voltage, electric current
Multiplier data are transferred to described control unit after processing, and described control unit calculates the current/voltage phase under this frequency
Potential difference value, if current/voltage phase difference value diminishes, then returns step S3；Otherwise, step S5 is entered；
S5, continuation increase frequency, it is judged that whether current/voltage phase difference value continues to become big, the frequency of setting is big the most at present
In optimum frequency resonance point, it is gradually reduced frequency；If it is not, then return step S4；
S6, reducing during frequency, if current/voltage phase difference value diminishes, then continuing to be gradually reduced frequency；If electric current is electric
Pressure phase difference value becomes big, and this frequency corresponding to current/voltage phase contrast is exactly optimum frequency resonance point.
The auto frequency locking method of digital ultrasonic generator the most according to claim 5, it is characterised in that: in step S4
In, the method for calculating current voltage-phase difference comprises the following steps:
S41, isolation voltage detection module and isolation current detection module are by defeated to the isolation voltage value detected and isolation current value
The input entered to voltage, electric current multiplier calculates, and result of calculation voltage, the outfan of electric current multiplier are filtered through electric capacity
DC component is obtained after ripple；
S42, described DC component obtain current/voltage phase difference value after carrying out arc cosine computing by control unit.
Digital ultrasonic generator auto frequency locking method the most according to claim 5, it is characterised in that: in step S3
In, to the isolation voltage value collected and isolation current value carry out signal condition filtering, obtain accurately isolation voltage value and every
From current value.
Digital ultrasonic generator auto frequency locking method the most according to claim 5, it is characterised in that: in step S3
In, it is the first one step to arrange certain frequency, by often increasing the mode of the first one step to be gradually increased frequency.
Digital ultrasonic generator auto frequency locking method the most according to claim 5, it is characterised in that: in step S5
In, it is the second one step to arrange certain frequency, continues to increase frequency by the mode often increasing by the second one step；Described
N times that the second one step is the first one step and 2 < n < 5.
Digital ultrasonic generator auto frequency locking method the most according to claim 8, it is characterised in that: in step S5
In, in the way of often reducing the first one step, it is gradually reduced frequency.
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