CN106140592B - Digital ultrasonic generator and its auto frequency locking method - Google Patents
Digital ultrasonic generator and its auto frequency locking method Download PDFInfo
- Publication number
- CN106140592B CN106140592B CN201610611587.9A CN201610611587A CN106140592B CN 106140592 B CN106140592 B CN 106140592B CN 201610611587 A CN201610611587 A CN 201610611587A CN 106140592 B CN106140592 B CN 106140592B
- Authority
- CN
- China
- Prior art keywords
- frequency
- oxide
- semiconductor
- bridge arm
- voltage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Inverter Devices (AREA)
- Transducers For Ultrasonic Waves (AREA)
Abstract
The invention discloses current waveforms and voltage waveform that a kind of isolated measurement transducer of digital ultrasonic generator loads both ends, what is acquired is the current signal and voltage signal under effective power, motion tracking frequency is come from by the above signal, can accurately find out resonant frequency.Voltage waveform and current waveform are subjected to multiplication calculating, the size of obtained DC waveform directly reflects the phase difference φ sizes of voltage current waveform, Δ φ is smaller, then illustrate energy converter closer to pure resistance, energy converter efficiency eta is also bigger, and frequency of oscillation is closer to optimum resonance point, so that energy converter loaded work piece is in resonant condition, to improve the transfer efficiency of ultrasonic transducer, the calorific value of inductance and transformer is reduced, to improve the stability and high efficiency of electric current.
Description
Technical field
The present invention relates to supersonic generators, more particularly to a kind of digital ultrasonic generator and its automatic lock
Frequency method.
Background technology
Supersonic generator is the important component of ultrasonic device, is responsible for ultrasonic transducer and provides supersonic frequency electric energy
Effect.In order to make the high-frequency work of ultrasonic transducer and play the superiority of Ultrasonic machining, it is desirable that vibrational system is operated in
Resonant condition.Before general transducer vibrations system work, resonance can be in meet system by adjusting the electric frequency of power supply
Operating condition.But in actual processing, due to the impression of the series of factors such as the variation of load, system heat generation, make vibration system
The intrinsic frequency of system changes, if adjusting the supply frequency of energy converter not in time at this time, vibrational system would operate in disresonance
State reduces to make it export amplitude, and work quality declines, and when detuning serious, can also damage ultrasonic equipment.
In order to enable supersonic generator to work under resonance condition, automatic frequency tracking can be set in supersonic generator
Circuit.So-called automatic frequency tracking refers to control system energy under the influence of extraneous factor when eigentone changes
Finding that the intrinsic frequency after the intrinsic frequency after changing and in time adjustment frequency of supply and variation is identical immediately makes vibrational system begin
It is operated in resonant condition eventually, to maintain the peak swing of vibrational system.Currently, the method for supersonic generator auto frequency locking also has
It is a variety of.State Intellectual Property Office discloses Patent No. ZL2007100736316, and patent name is digital ultrasonic generator
Patent of invention, which 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 the target to be found, f (frequency of supersonic generator) is the factor influenced.
F is divided into several equal portions in allowed limits first, to obtain the push-in stroke △ f of control f processes.Assuming that original state is in f1
Place obtains corresponding I1 by measuring；Then f is pushed ahead to f2, and can arrive I2；Then compare the size of I2 and I1, if I2>
I1, then it represents that I is increasing.At this point, being pushed further into f3 (corresponding I3) along former direction, so constantly carry out, until f4 is (corresponding
When I4), if f5 (corresponding I5) is further advanced into, it can be seen from the figure that I5 at this time<I4, i.e. I values have dropped, this explanation
Control has been more than extreme point, should change former direction of propulsion at this time, i.e. reverse propulsion finds resonant frequency.Such prior art surpasses
The method of sonic generator auto frequency locking has following defect：
The electric current I of sampling is the input current of half-bridge inversion circuit, as the alternating current at the ends alternating current 220V, this alternating current
Stream contain a large amount of high-frequency noise, and the size of input current reflected only input power size, can not be accurate
Size of the reflection output to the effective power of ultrasonic transducer.
The resonant frequency of the method locking of the supersonic generator auto frequency locking of the prior art makes the defeated of half-bridge inversion circuit
Enter electric current and reaches maximum, i.e. general power PAlwaysReach maximum.And according to transfer efficiency factorη is bigger, then surpasses
Acoustic wave transducer transfer efficiency is higher, and frequency of oscillation is closer to optimum resonance point.If general power PAlwaysIt is very big, but η very littles, then it changes
The effective power P of energy deviceEffectivelyVery little illustrates most of power consumption on inductance and transformer.So sampling semi-bridge inversion electricity
The input current on road can not correctly lock resonant frequency, and therefore, ultrasonic transducer can not just be operated in resonant condition, from
And the transfer efficiency of ultrasonic transducer is influenced, cause to generate a large amount of heat on inductance and transformer, affects the steady of circuit
Qualitative and efficiency.
Invention content
The technical problem to be solved by the present invention is to provide a kind of digital ultrasonic generator, digital type ultrasound wave hair
Raw device frequency locking is more accurate, and ultrasonic transducer is enable to be operated in resonant condition, to improve the conversion effect of ultrasonic transducer
Rate enables the circuitry to more stably and efficiently work.
Technical solution of the invention is to provide a kind of digital ultrasonic generator having following structure, including
Control unit, high-frequency inverter circuit, automatic frequency sweep frequency locking control unit, oscillation and driving circuit, impedance matching circuit and transducing
Device loads；The control unit is connect with the automatic frequency sweep frequency locking control unit, automatic frequency sweep frequency locking control
Unit is connect with the oscillation and driving circuit, and the oscillation and driving circuit are connect with the high-frequency inverter circuit；
The high-frequency inverter circuit is connect with the impedance matching circuit；The impedance matching circuit is negative with the energy converter
Carry connection, it is characterised in that：Digital ultrasonic generator further include isolation voltage detection module, isolation current detection module and
Voltage, electric current multiplier；The input terminal of the isolation voltage detection module and the input that current detection module is isolated
End is connect with the impedance matching circuit respectively；Electric current is isolated with described in the output end of the isolation voltage detection module
The output end of detection module is connect with two input terminals of the voltage, electric current multiplier respectively, and the voltage, electric current multiply
The output end of musical instruments used in a Buddhist or Taoist mass is connect with the control unit.
After using the above structure, digital ultrasonic generator of the invention has following excellent compared with prior art
Point：
Since the isolated measurement transducer of the digital ultrasonic generator of the present invention loads the current waveform and electricity at both ends
Corrugating, acquisition is current signal and voltage signal under effective power, and motion tracking frequency is come from by the above signal, can
Accurately find out resonant frequency.Voltage waveform and current waveform are subjected to multiplication calculating, the size of obtained DC waveform is directly anti-
The phase difference φ sizes of voltage current waveform are mirrored, Δ φ is smaller, then illustrates energy converter closer to pure resistance, energy converter conversion
Efficiency eta is also bigger, and frequency of oscillation is closer to optimum resonance point so that energy converter loaded work piece is in resonant condition, to improve
The transfer efficiency of ultrasonic transducer reduces the calorific value of inductance and transformer, to improve the stability and high efficiency of electric current.
As an improvement, the high-frequency inverter circuit includes high voltage half-bridge control chip, upper bridge arm metal-oxide-semiconductor and lower bridge arm
Metal-oxide-semiconductor；The high voltage half-bridge control chip connects with the oscillation and driving circuit, upper bridge arm metal-oxide-semiconductor and lower bridge arm metal-oxide-semiconductor
It connects, the upper bridge arm metal-oxide-semiconductor and lower bridge arm metal-oxide-semiconductor are connect with the impedance matching circuit respectively.In high-frequency inversion electric current
In, pulsed high-frequency transformer driving half-bridge field-effect tube is relatively mostly used currently on the market, when upper and lower bridge turn-on deadline in the method
Switching is in a flash, it may occur that the phenomenon that upper and lower bridge simultaneously turns on can form high current, although the time simultaneously turned on is non-in this way
It is often short, but can also make bridge chip fever up and down so that this kind of product can not longtime running, or need to install big cooling fin and dissipate
Hot-air fan radiates.And chip is controlled to drive half-bridge field-effect tube using high voltage half-bridge in the present invention, it is connected in upper and lower bridge
Certain dead time is added in a flash in cut-off switching, and the bridge there is a phenomenon where above and below is avoided to simultaneously turn on, to avoid up and down
The case where bridge chip excessive heating, therefore product can be with longtime running, and be not necessarily to that large-scale heat dissipation equipment is installed.
As an improvement, the high-frequency inverter circuit further includes the MOSVGS driving clamping protective circuits of upper bridge arm metal-oxide-semiconductor
Clamping protective circuit is driven with the MOSVGS of lower bridge arm metal-oxide-semiconductor；The MOSVGS driving clamper protection electricity of the upper bridge arm metal-oxide-semiconductor
Road includes the first diode, the second diode and first resistor, the G of the anode of first diode and upper bridge arm metal-oxide-semiconductor
Pole connects, and the cathode of first diode is connect with the cathode of second diode, first resistor connection
Between the anode and the anode of the second diode of first diode；The MOSVGS of the lower bridge arm metal-oxide-semiconductor drives
Clamping protective circuit includes third diode, the 4th diode and second resistance, anode and the upper bridge of the third diode
The poles G of arm metal-oxide-semiconductor connect, and the cathode of the third diode is connect with the cathode of the 4th diode, and described the
Two resistance are connected between the anode and the anode of the 4th diode of the third diode.After adopting the structure, upper bridge
The MOSVGS driving clamping protective circuits of arm metal-oxide-semiconductor and the MOSVGS of lower bridge arm metal-oxide-semiconductor drive clamping protective circuit to upper bridge arm
Metal-oxide-semiconductor and lower bridge arm metal-oxide-semiconductor have protective effect.
As an improvement, the high-frequency inverter circuit further includes upper bridge arm metal-oxide-semiconductor protection circuit and the protection of lower bridge arm metal-oxide-semiconductor
Circuit；The described upper bridge arm metal-oxide-semiconductor protection circuit includes the 5th diode, 3rd resistor and the first capacitance, and the described the 5th 2
The anode of pole pipe is connect with the poles S of the upper bridge arm metal-oxide-semiconductor, the cathode of the 5th diode and the upper bridge arm
The poles D of metal-oxide-semiconductor connect, and one end of the 5th diode is connect with the poles D of the upper bridge arm metal-oxide-semiconductor, the third
The other end of resistance is connect with one end of first capacitance, the other end of first capacitance and the upper bridge arm
The poles S of metal-oxide-semiconductor connect；The lower bridge arm metal-oxide-semiconductor protection circuit includes the 6th diode, the 4th resistance and the second capacitance, institute
The anode for the 6th diode stated is connect with the poles S of the upper bridge arm metal-oxide-semiconductor, the cathode of the 6th diode with it is described
Upper bridge arm metal-oxide-semiconductor the poles D connection, one end of the 4th resistance is connect with the poles D of the upper bridge arm metal-oxide-semiconductor, described
The other end of the 4th resistance connect with one end of second capacitance, the other end of second capacitance with it is described upper
The poles S of bridge arm metal-oxide-semiconductor connect.After adopting the structure, upper bridge arm metal-oxide-semiconductor protection circuit and lower bridge arm metal-oxide-semiconductor protect circuit pair
Upper bridge arm metal-oxide-semiconductor and lower bridge arm metal-oxide-semiconductor have protective effect.
The invention solves another technical problems to be to provide a kind of auto frequency locking method of digital ultrasonic generator,
The auto frequency locking method can accurately and efficiently find the resonant frequency of supersonic generator, make energy converter loaded work piece most
Good resonant condition enables the circuitry to more stably and efficiently work to put forward high-power transfer efficiency.
Technical solution of the invention is to provide a kind of the automatic of the digital ultrasonic generator having steps of
Locking method includes the following steps：
S1, digital ultrasonic generator initialization program；
S2, the control unit start setting up frequency according to the frequency range that energy converter loads from minimum value；
S3, gradually increase frequency, often increase stabilization time T after a frequency, the isolation voltage inspection after time T
Survey module acquisition isolation voltage value and isolation current detection module acquisition isolation current value；
S4, by isolation voltage value and isolation current value the input voltage, electric current multiplier, by the voltage,
The control unit is transferred to after electric current multiplier data processing, the control unit calculates the electricity of the electric current under the frequency
Press phase difference value, if Current Voltage phase difference value becomes smaller, return to step S3；Otherwise, S5 is entered step；
S5, continue to increase frequency, judge whether Current Voltage phase difference value continues to become larger, if so, the frequency being arranged at present
Rate is more than optimum frequency resonance point, is gradually reduced frequency；If it is not, then return to step S4；
S6, during reducing frequency, if Current Voltage phase difference value becomes smaller, continue to be gradually reduced frequency；If electric
Galvanic electricity pressure phase difference value becomes larger, and the frequency corresponding to this Current Voltage phase difference is exactly optimum frequency resonance point.
After using the above structure, the auto frequency locking method of digital ultrasonic generator of the invention, with prior art phase
Than haing the following advantages：
Due to the present invention digital ultrasonic generator auto frequency locking method acquisition be energy converter load both ends
Current waveform and voltage waveform, what is directly reflected is the size of effective power, and signal acquisition is more effective, and according to Current Voltage phase
Potential difference is smaller, illustrates energy converter closer to pure resistance, and energy converter efficiency eta is also bigger, and frequency of oscillation is closer to best humorous
The foundation shaken a little finds resonant frequency, so as to accurately finding out resonant frequency.And digital ultrasound through the invention
The efficiency that the auto frequency locking method of wave producer carries out frequency locking is higher, and supersonic generator can be accurate and efficiently finds out again super
The resonant frequency of sonic generator.
As an improvement, in step s 4, the method for calculating current voltage-phase difference includes the following steps：S41, isolation electricity
Pressing detection module and isolation current detection module, current value is input to voltage, electric current multiplies with isolation by the isolation voltage value detected
The input terminal of musical instruments used in a Buddhist or Taoist mass is calculated, result of calculation voltage, electric current multiplier output end direct current point is obtained after capacitor filtering
Amount；S42, the DC component obtain Current Voltage phase difference value after carrying out arc cosine computing by control unit.Using this
After kind structure, the method for calculating current voltage-phase difference is simple and reliable.
As an improvement, in step s3, signal condition filtering is carried out to collected isolation voltage value and isolation current value,
Obtain accurately isolation voltage value and isolation current value.After adopting the structure so that isolation voltage value and isolation current value are more
Add precisely.
As an improvement, in step s3, certain frequency is arranged as the first one step, by often increasing by the first one step
Mode come gradually increase frequency.After adopting the structure, it is more regular to increase frequency, is conducive to accurately to find optimum frequency humorous
It shakes a little.
As an improvement, in step s 5, certain frequency is arranged as the second one step, by often increasing by the second one step
Mode come continue increase frequency；Second one step is n times and 2 of the first one step<n<5.Using such knot
After structure, erroneous judgement can be avoided the occurrence of by the method for increasing one step at this moment, i.e., since supersonic generator is worked
Cheng Zhong, waveform can have the phenomenon that burr, increase one step and may be determined whether that encountering becoming larger for burr still really looks for
Optimum resonant frequency is arrived, so that automatic frequency sweep work is relatively reliable.
As an improvement, in step s 5, frequency is gradually reduced in a manner of the first one step of every reduction.Using such
After structure, reduction frequency is more regular, is conducive to accurately find optimum frequency resonance point.
Description of the drawings
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 the 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 energy converter load both ends of the digital ultrasonic generator of the prior art.
Fig. 7 is the voltage and current waveform at the energy converter load both ends of the digital ultrasonic generator of the present invention.
Specific implementation mode
The invention will be further described in the following with reference to the drawings and specific embodiments.
Refering to Figure 1, the present invention digital ultrasonic generator, including control unit, high-frequency inverter circuit, from
Dynamic frequency sweep frequency locking control unit, oscillation and driving circuit, impedance matching circuit and energy converter load；The control unit and institute
The automatic frequency sweep frequency locking control unit connection stated, the automatic frequency sweep frequency locking control unit and the oscillation and driving circuit
Connection, the oscillation and driving circuit are connect with the high-frequency inverter circuit；The high-frequency inverter circuit with it is described
Impedance matching circuit connects；The impedance matching circuit is connected with the energy converter load, it is characterised in that：It is digital super
Sonic generator further includes isolation voltage detection module, isolation current detection module and voltage, electric current multiplier；The isolation
The input terminal of voltage detection module and the input terminal that current detection module is isolated respectively with the impedance matching circuit
Connection；The output end of the isolation voltage detection module and the output end that current detection module is isolated respectively with it is described
Voltage, electric current multiplier the connection of two input terminals, the voltage, electric current multiplier output end and the control list
Member connection.
Shown in Fig. 2, P201~P204 forms energy converter load circuit with ultrasonic transducer；
T201, L201, C207, R210 composition impedance matching circuit；Wherein T201 is the transformer of energy converter, real
Conversion function is isolated in existing energy；C207 and R210 is transformer filter protective circuit, realizes spike on filtering transformer
Function；L201 is the impedance matching inductance of energy converter, realizes the impedance matching effect of energy converter；
U202, U204, U208 are high speed photo coupling and its peripheral circuit composition photoelectric-isolated oscillating circuit, for realizing
Phototube Coupling avoids controller signals from failing；
The U201 and R212 compositions isolation current detection circuit, wherein U201 is HF current transformer, realizes electricity
Flow the isolated detection of waveform.
Isolation voltage detection circuit U206, U207 described with its peripheral circuit composition, realizes the isolated of voltage waveform
Detection；Wherein U207 is high frequency voltage mutual inductor；U206 is high-operational amplifier amplifier, forms second-order low-pass filter circuit, by
Contain a large amount of high-frequency noise in voltage waveform, after second-order low-pass filter circuit, eliminates high-frequency noise, make voltage signal
It is more reliable and more stable.
The U209 and U205 compositions voltage, electric current multiplier, can obtain voltage current waveform by mathematical formulae
Phase difference；Wherein U209 is analog multiplier；U205 is high-precision voltage-reference, and the voltage and current for providing 2.5V is sinusoidal
The direct current central point of waveform.
U203, Q201, Q203 and its peripheral circuit form high-frequency inverter circuit；High-frequency inverter circuit includes high voltage half-bridge control
Coremaking piece U203, upper bridge arm metal-oxide-semiconductor Q201 and lower bridge arm metal-oxide-semiconductor Q203；The described high voltage half-bridge control chip U203 with it is described
Oscillation and driving circuit, upper bridge arm metal-oxide-semiconductor Q201 connected with lower bridge arm metal-oxide-semiconductor Q203, the upper bridge arm metal-oxide-semiconductor Q201 and
Lower bridge arm metal-oxide-semiconductor Q203 is connect with the impedance matching circuit respectively.The high-frequency inverter circuit further includes upper bridge arm MOS
The MOSVGS driving clamping protective circuits of pipe and the MOSVGS of lower bridge arm metal-oxide-semiconductor drive clamping protective circuit；The upper bridge arm
The MOSVGS driving clamping protective circuits of metal-oxide-semiconductor include the first diode D201, the second diode D204 and first resistor R205,
The anode of the first diode D201 is connect with the poles G of upper bridge arm metal-oxide-semiconductor, the cathode of the first diode D201 with
The cathode of the second diode D204 connects, and the first resistor R205 is connected to the first diode D201's
Between anode and the anode of the second diode D204；The lower bridge arm metal-oxide-semiconductor MOSVGS driving clamping protective circuit include
Third diode D206, the 4th diode D207 and second resistance R213, anode and the upper bridge of the third diode D206
The poles G of arm metal-oxide-semiconductor connect, and the cathode of the third diode D206 is connect with the cathode of the 4th diode D207,
The second resistance R213 is connected between the anode and the anode of the 4th diode D207 of the third diode D206.
The high-frequency inverter circuit further includes upper bridge arm metal-oxide-semiconductor protection circuit and lower bridge arm metal-oxide-semiconductor protection circuit；The upper bridge arm
It includes the 5th diode D203,3rd resistor R203 and the first capacitance C204, the 5th diode that metal-oxide-semiconductor, which protects circuit,
The anode of D203 is connect with the poles S of the upper bridge arm metal-oxide-semiconductor, the cathode of the 5th diode D203 and the upper bridge
The poles D of arm metal-oxide-semiconductor connect, and one end of the 3rd resistor R203 is connect with the poles D of the upper bridge arm metal-oxide-semiconductor, described
The other end of 3rd resistor R203 is connect with one end of the first capacitance C204, the other end of the first capacitance C204
It is connect with the poles S of the upper bridge arm metal-oxide-semiconductor；The lower bridge arm metal-oxide-semiconductor protection circuit includes the 6th diode D205, the 4th
Resistance R208 and the second capacitance C208, the anode of the 6th diode D205 and the poles S of the upper bridge arm metal-oxide-semiconductor connect
It connects, the cathode of the 6th diode D205 is connect with the poles D of the upper bridge arm metal-oxide-semiconductor, the 4th resistance R208
One end connect with the poles D of the upper bridge arm metal-oxide-semiconductor, the other end of the 4th resistance R208 and second capacitance
One end of C208 connects, and the other end of the second capacitance C208 is connect with the poles S of the upper bridge arm metal-oxide-semiconductor.C201、
R201 and C211 and R214 is the center voltage point of upper and lower bridge respectively, realizes 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 the prior art, it can be clearly seen that
Drive waveforms contain a large amount of spike burr, and with the signal of overshoot, and upper bridge arm waveform and lower bridge arm waveform exist centainly
The overlapping region of time, this can be such that upper and lower bridge arm metal-oxide-semiconductor is simultaneously turned in this section of overlapping region, form upper and lower bridge arm short circuit,
The phenomenon that making metal-oxide-semiconductor generate fever.
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 do not contain a large amount of spike burr, the signal of no overshoot, and there are when certain dead zone for upper bridge arm and lower bridge arm
Between, overlapping region is not present, therefore, upper and lower bridge arm metal-oxide-semiconductor will not simultaneously turn on, and there is no metal-oxide-semiconductors, and fever is generated because of short circuit
The phenomenon that.
The auto frequency locking method of the digital ultrasonic generator of the present invention, includes the following steps：
S1, digital ultrasonic generator initialization program；
S2, the control unit start setting up frequency according to the frequency range that energy converter loads from minimum value；
S3, certain frequency is arranged as the first one step, gradually increase frequency, often increase first one step
Stabilization time T after frequency, isolation voltage detection module acquisition isolation voltage value and isolation electricity after time T
Flow detection module acquisition isolation current value；Signal condition filtering is carried out to collected isolation voltage value and isolation current value, is obtained
To accurately isolation voltage value and isolation current value.
S4, by isolation voltage value and isolation current value the input voltage, electric current multiplier, by the voltage,
The control unit is transferred to after electric current multiplier data processing, the control unit calculates the electricity of the electric current under the frequency
Press phase difference value, if Current Voltage phase difference value becomes smaller, return to step S3；Otherwise, S5 is entered step；Calculating current voltage phase
The method of potential difference value includes the following steps：
S41, isolation voltage detection module and isolation current detection module are by the isolation voltage value detected and electric current is isolated
Value is input to voltage, the input terminal of electric current multiplier is calculated, and result of calculation voltage, the output end process of electric current multiplier are electric
DC component is obtained after capacitor filter；
S42, the DC component obtain Current Voltage phase difference value after carrying out arc cosine computing by control unit.
S5, the frequency for increasing by the second one step, second one step are n times and 2 of the first one step<n<
5.Judge whether Current Voltage phase difference value continues to become larger, if so, the frequency being arranged 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 to step S4；
S6, during reducing frequency, if Current Voltage phase difference value becomes smaller, continue it is gradual with the first one step
Reduce frequency；If Current Voltage phase difference value becomes larger, the frequency corresponding to this Current Voltage phase difference 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, which obtains voltage,mcos(ωt+φu), the electric current that isolation current detection module obtains
For I=Imcos(ωt+φi), wherein UmIt is voltage amplitude, ω is the angular frequency of waveform, φuIt is the initial phase of voltage waveform
Angle, ImIt is current amplitude, φiIt is the starting phase angle of current waveform.
Therefore, power P=UI=UmImcos(ωt+φu)cos(ωt+φi), with product to sum formula,cos(2ωt+φu+φi) be 2 ω of angular frequency sine wave, waveform
Starting phase angle is φu+φi.And we concern cos (φu-φi) part, setting Δ φ=φu-φiIt is exactly voltage electricity
The phase difference for flowing waveform, is a steady state value, therefore cos (φu-φi) it is a DC component.Therefore, power P be exactly withCentered on point, 2 ω be angular frequency sine wave.Expect the phase difference 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 energy converter load both ends of the digital ultrasonic generator of the prior art, from
It can be seen from the figure that, energy converter load both end voltage, electric current drive waveforms are the sine waves of a setpoint frequency, but voltage,
There is larger phase difference at the phase angle of electric current, can not be formed and be essentially coincided, and it is best humorous to illustrate that ultrasonic transducer can not be operated in
It shakes in dot frequency, and there are larger spike on the waveform of voltage and current, is easy that ultrasonic transducer is made to cause machine
Tool noise is easy to damage energy converter, influences service life.
Fig. 7 is the voltage and current waveform at the energy converter load both ends of the digital ultrasonic generator of the present invention, from figure
In as can be seen that energy converter 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, illustrate that ultrasonic transducer is operated in specific resonant frequency, this frequency is transducing
The optimum resonance point of device, therefore, the method for the auto frequency locking of digital ultrasonic generator through the invention can be looked for accurately
The optimum resonance point loaded to ultrasonic transducer, to improve the performance of product.
Claims (10)
1. a kind of digital ultrasonic generator, including control unit, high-frequency inverter circuit, automatic frequency sweep frequency locking control unit,
Oscillation and driving circuit, impedance matching circuit and energy converter load；The control unit and the automatic frequency sweep frequency locking control
Unit processed connection, the automatic frequency sweep frequency locking control unit are connect with the oscillation and driving circuit, the oscillation and
Driving circuit is connect with the high-frequency inverter circuit；The high-frequency inverter circuit is connect with the impedance matching circuit；
The impedance matching circuit is connected with the energy converter load, it is characterised in that：Digital ultrasonic generator further includes
Isolation voltage detection module, isolation current detection module and voltage, electric current multiplier；The isolation voltage detection module it is defeated
Enter end to connect with the impedance matching circuit respectively with the input terminal that current detection module is isolated；The isolation electricity
Press output end and the output end that current detection module is isolated of detection module respectively with the voltage, electric current multiplier
Two input terminals connection, the voltage, electric current multiplier output end connect with the control unit.
2. digital ultrasonic generator according to claim 1, it is characterised in that：The high-frequency inverter circuit includes
High voltage half-bridge controls chip, upper bridge arm metal-oxide-semiconductor and lower bridge arm metal-oxide-semiconductor；The high voltage half-bridge control chip and the oscillation
And driving circuit, upper bridge arm metal-oxide-semiconductor are connected with lower bridge arm metal-oxide-semiconductor, the upper bridge arm metal-oxide-semiconductor and lower bridge arm metal-oxide-semiconductor respectively with
The impedance matching circuit connection.
3. digital ultrasonic generator according to claim 2, it is characterised in that：The high-frequency inverter circuit also wraps
Include the MOSVGS driving clamping protective circuits of bridge arm metal-oxide-semiconductor and the MOSVGS driving clamping protective circuits of lower bridge arm metal-oxide-semiconductor；Institute
The MOSVGS driving clamping protective circuits for the upper bridge arm metal-oxide-semiconductor stated include the first diode (D201), the second diode (D204)
And first resistor (R205), the anode of first diode (D201) are connect with the poles G of upper bridge arm metal-oxide-semiconductor, described
The cathode of one diode (D201) is connect with the cathode of second diode (D204), and the first resistor (R205) is even
It is connected between the anode and the anode of the second diode (D204) of first diode (D201)；The lower bridge arm MOS
The MOSVGS driving clamping protective circuits of pipe include third diode (D206), the 4th diode (D207) and second resistance
(R213), the anode of the third diode (D206) is connect with the poles G of upper bridge arm metal-oxide-semiconductor, the third diode
(D206) cathode is connect with the cathode of the 4th diode (D207), and the second resistance (R213) is connected to described
Third diode (D206) anode and the anode of the 4th diode (D207) between.
4. digital ultrasonic generator according to claim 2, it is characterised in that：The high-frequency inverter circuit also wraps
Include bridge arm metal-oxide-semiconductor protection circuit and lower bridge arm metal-oxide-semiconductor protection circuit；The upper bridge arm metal-oxide-semiconductor protection circuit includes the 5th
Diode (D203), 3rd resistor (R203) and the first capacitance (C204), the anode of the 5th diode (D203) and institute
The poles S for the upper bridge arm metal-oxide-semiconductor stated connect, the poles D of the cathode of the 5th diode (D203) and the upper bridge arm metal-oxide-semiconductor
Connection, one end of the 5th diode (D203) are connect with the poles D of the upper bridge arm metal-oxide-semiconductor, the 3rd resistor
(R203) the other end is connect with one end of first capacitance (C204), the other end of first capacitance (C204) with
The poles S of the upper bridge arm metal-oxide-semiconductor connect；The lower bridge arm metal-oxide-semiconductor protection circuit includes the 6th diode (D205), the 4th
Resistance (R208) and the second capacitance (C208), the S of the anode of the 6th diode (D205) and the upper bridge arm metal-oxide-semiconductor
Pole connects, and the cathode of the 6th diode (D205) is connect with the poles D of the upper bridge arm metal-oxide-semiconductor, the described the 4th electricity
Resistance (R208) one end connect with the poles D of the upper bridge arm metal-oxide-semiconductor, the other end of the 4th resistance (R208) with it is described
The second capacitance (C208) one end connection, the S of the other end of second capacitance (C208) and the upper bridge arm metal-oxide-semiconductor
Pole connects.
5. a kind of auto frequency locking method of the digital ultrasonic generator described in Claims 1-4 any one, including it is following
Step：
S1, digital ultrasonic generator initialization program；
S2, the control unit start setting up frequency according to the frequency range that energy converter loads from minimum value；
S3, gradually increase frequency, often increase stabilization time T after a frequency, the isolation voltage detects mould after time T
Block acquires isolation voltage value and isolation current detection module acquisition isolation current value；
S4, the voltage by described in isolation voltage value and isolation current value input, electric current multiplier, by the voltage, electric current
The control unit is transferred to after multiplier data processing, the control unit calculates the Current Voltage phase under the frequency
Potential difference value, if Current Voltage phase difference value becomes smaller, return to step S3；Otherwise, S5 is entered step；
S5, continue to increase frequency, judge whether Current Voltage phase difference value continues to become larger, if so, the frequency being arranged at present is big
In optimum frequency resonance point, it is gradually reduced frequency；If it is not, then return to step S4；
S6, during reducing frequency, if Current Voltage phase difference value becomes smaller, continue to be gradually reduced frequency；If electric current is electric
Pressure phase difference value becomes larger, and the frequency corresponding to this Current Voltage phase difference is exactly optimum frequency resonance point.
6. the auto frequency locking method of digital ultrasonic generator according to claim 5, it is characterised in that：In step S4
In, the method for calculating current voltage-phase difference includes the following steps：
S41, isolation voltage detection module and isolation current detection module are defeated by the isolation voltage value detected and isolation current value
The input terminal entered to voltage, electric current multiplier is calculated, result of calculation voltage, electric current multiplier output end by capacitance filter
DC component is obtained after wave；
S42, the DC component obtain Current Voltage phase difference value after carrying out arc cosine computing by control unit.
7. digital ultrasonic generator auto frequency locking method according to claim 5, it is characterised in that：In step S3
In, to collected isolation voltage value and isolation current value carry out signal condition filtering, obtain accurately isolation voltage value and every
From current value.
8. digital ultrasonic generator auto frequency locking method according to claim 5, it is characterised in that：In step S3
In, certain frequency is arranged as the first one step, gradually increase frequency in the way of often increasing by the first one step.
9. digital ultrasonic generator auto frequency locking method according to claim 5, it is characterised in that：In step S5
In, certain frequency is arranged as the second one step, continue to increase frequency in the way of often increasing by the second one step；It is described
The second one step be n times and 2 of the first one step<n<5.
10. digital ultrasonic generator auto frequency locking method according to claim 8, it is characterised in that：In step S5
In, it is gradually reduced frequency in a manner of the first one step of every reduction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610611587.9A CN106140592B (en) | 2016-07-29 | 2016-07-29 | Digital ultrasonic generator and its auto frequency locking method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610611587.9A CN106140592B (en) | 2016-07-29 | 2016-07-29 | Digital ultrasonic generator and its auto frequency locking method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106140592A CN106140592A (en) | 2016-11-23 |
| CN106140592B true CN106140592B (en) | 2018-09-25 |
Family
ID=57327661
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610611587.9A Active CN106140592B (en) | 2016-07-29 | 2016-07-29 | Digital ultrasonic generator and its auto frequency locking method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106140592B (en) |
Families Citing this family (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| IT201700021392A1 (en) | 2017-02-24 | 2018-08-24 | St Microelectronics Srl | PILOT CIRCUIT, ULTRASONIC EQUIPMENT AND CORRESPONDENT PROCEDURE |
| US10730073B2 (en) | 2017-02-24 | 2020-08-04 | Stmicroelectronics S.R.L. | Electronic circuit, corresponding ultrasound apparatus and method |
| CN108007557A (en) * | 2017-11-22 | 2018-05-08 | 锐泰安医疗科技（苏州）有限公司 | A kind of method and apparatus of lookup resonant frequency point for transducer |
| CN108196122B (en) * | 2018-02-24 | 2023-05-02 | 深圳世格赛思医疗科技有限公司 | Waveform phase identification method, device, system, computer and storage medium |
| CN108422076B (en) * | 2018-05-15 | 2024-07-02 | 无锡恒声特超声波焊接设备有限公司 | Ultrasonic welding generator |
| CN110531344B (en) * | 2018-05-24 | 2022-02-22 | 宝山钢铁股份有限公司 | Special integrated circuit for ultrasonic multi-channel phased array detection automatic resonance and directional receiving |
| CN110639787A (en) * | 2018-06-26 | 2020-01-03 | 金顿仪器科技（昆山）有限公司 | Ultrasonic frequency adjusting device for ultrasonic processing tool |
| CN110801144B (en) * | 2018-08-06 | 2021-07-20 | 佛山市顺德区美的电热电器制造有限公司 | Control method and system of cooking device and cooking device |
| CN109613523B (en) * | 2018-10-23 | 2023-04-07 | 南通赛洋电子有限公司 | Probe instrument signal preprocessing circuit |
| CN109365250B (en) * | 2018-10-26 | 2021-01-01 | 重庆大学 | Frequency locking implementation method for high-frequency ultrasonic transducer |
| CN109633484B (en) * | 2018-12-13 | 2021-06-29 | 深圳市英威腾电气股份有限公司 | Phase locking method, device and equipment of intermediate frequency power supply |
| CN109633264B (en) * | 2018-12-13 | 2021-07-06 | 深圳市英威腾电气股份有限公司 | Frequency searching method, device and equipment of intermediate frequency power supply |
| US12035445B2 (en) * | 2019-03-29 | 2024-07-09 | Cirrus Logic Inc. | Resonant tracking of an electromagnetic load |
| CN110496779B (en) * | 2019-08-20 | 2022-07-15 | 河南科技学院 | Ultrasonic screening transducer resonant frequency self-locking and real-time correction method and ultrasonic screening transducer power supply circuit |
| CN112138617A (en) * | 2020-09-09 | 2020-12-29 | 西安仙峒科技有限责任公司 | Fast starting operation method for cavitation |
| CN113102208B (en) * | 2021-04-16 | 2022-05-31 | 东莞声索电子有限公司 | Automatic frequency tracking device and automatic frequency tracking method for generator of ultrasonic cleaning machine |
| CN114101015B (en) * | 2022-01-25 | 2022-07-05 | 深圳市大族封测科技股份有限公司 | Ultrasonic transducer and control system, method and device thereof |
| CN116930728B (en) * | 2023-09-18 | 2023-11-24 | 河北德凯铁路信号器材有限公司 | Track circuit testing system, method and device, electronic equipment and storage medium |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB0129139D0 (en) * | 2001-12-05 | 2002-01-23 | Sra Dev Ltd | Ultrasonic generator system |
| CN100408248C (en) * | 2005-10-24 | 2008-08-06 | 中国电子科技集团公司第四十五研究所 | High-accuracy self-adaptation driving power for ultrasonic transducer |
| CN201012353Y (en) * | 2007-03-22 | 2008-01-30 | 深圳市艾柯森自动化设备有限公司 | Digital type ultrasonic generator |
| CN201522651U (en) * | 2009-09-17 | 2010-07-07 | 东莞市长江超声波机有限公司 | Ultrasonic generator |
| CN205988877U (en) * | 2016-07-29 | 2017-03-01 | 宁波中物东方光电技术有限公司 | Digital ultrasonic generator |
-
2016
- 2016-07-29 CN CN201610611587.9A patent/CN106140592B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN106140592A (en) | 2016-11-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106140592B (en) | Digital ultrasonic generator and its auto frequency locking method | |
| CN106423808B (en) | A kind of digital ultrasonic generator and its auto frequency locking method | |
| CN205988876U (en) | A kind of digital ultrasonic generator | |
| CN1157845C (en) | Non-synchronous motor parameter identification method | |
| US9899909B2 (en) | Control device and method of totem-pole bridgeless PFC soft switch | |
| CN101574757B (en) | Control system of ultrasonic welding machine | |
| CN103428969B (en) | A kind of linear constant current LED drive circuit and LED lamp | |
| CN101902129B (en) | Current-type multi-resonance direct current (DC) converter | |
| CN107860464A (en) | A kind of supersonic generator working frequency point searching method | |
| CN103036461A (en) | Three-phase rectifying module and applicable system thereof and harmonic suppression method | |
| CN111530845A (en) | Ultrasonic-based handheld descaling device and descaling method for voltage-sharing electrode | |
| CN206425212U (en) | A kind of supersonic generator for ultrasonic wave Compound Machining | |
| CN205988877U (en) | Digital ultrasonic generator | |
| CN202004661U (en) | Driving power source for rare earth giant magnetostrictive transducer | |
| Yu | Application of series resonant converters in laser power supply | |
| CN204190642U (en) | Based on the load phase adjuster of current follow-up control | |
| Hu et al. | A dynamically on-off controlled resonant converter designed for coalmining battery charging applications | |
| Long et al. | Constant amplitude control of high-power ultrasonic drive system | |
| CN207368899U (en) | Full-bridge LLC mode of resonance plasma electrical sources based on SiC power devices | |
| Wei et al. | Design of an automatic impedance matching circuit based on frequency tracking of ultrasonic transducer | |
| CN103414351B (en) | High-accuracy series resonance high voltage power supply for electric power test | |
| CN104001698A (en) | Magnetic ultrasonic wave on-line scale-preventing-removing all-in-one machine | |
| CN104113219A (en) | LCC resonant high-frequency sine-wave power supply | |
| CN1980021A (en) | Harmonic-wave inhibiting device of dc. load power-chanaging regulation | |
| TW201042897A (en) | Resonant converting apparatus and synchronous rectification circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |