CN108574425A - Piezoelectric element resonance compensation circuit and method - Google Patents
Piezoelectric element resonance compensation circuit and method Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 24
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- NKZSPGSOXYXWQA-UHFFFAOYSA-N dioxido(oxo)titanium;lead(2+) Chemical compound [Pb+2].[O-][Ti]([O-])=O NKZSPGSOXYXWQA-UHFFFAOYSA-N 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 229940068517 fruit extracts Drugs 0.000 description 2
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- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
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- 230000005540 biological transmission Effects 0.000 description 1
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- 238000013461 design Methods 0.000 description 1
- 230000002708 enhancing effect Effects 0.000 description 1
- 229910052746 lanthanum Inorganic materials 0.000 description 1
- FZLIPJUXYLNCLC-UHFFFAOYSA-N lanthanum atom Chemical compound [La] FZLIPJUXYLNCLC-UHFFFAOYSA-N 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02N—ELECTRIC MACHINES NOT OTHERWISE PROVIDED FOR
- H02N2/00—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction
- H02N2/0005—Electric machines in general using piezoelectric effect, electrostriction or magnetostriction producing non-specific motion; Details common to machines covered by H02N2/02 - H02N2/16
- H02N2/0075—Electrical details, e.g. drive or control circuits or methods
- H02N2/008—Means for controlling vibration frequency or phase, e.g. for resonance tracking
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Abstract
This application involves a kind of piezoelectric element resonance compensation circuit and methods.The circuit includes drive control circuit, series resonant circuit, operational amplifier and piezoelectric element；Drive control circuit connects series resonant circuit, and piezoelectric element is connect by operational amplifier with series resonant circuit.By carrying out frequency sweep to series resonance frequency according to default frequency range, and record the output voltage values of series resonant circuit, the series resonance frequency of series resonant circuit is extracted from frequency sweep result, the working frequency of piezoelectric element is adjusted according to series resonance frequency, so that the amplitude of piezoelectric element output end will not change with the difference of operating frequency, the working frequency of piezoelectric element is maintained at maximum efficiency simultaneously, improves the working efficiency of piezoelectric element.
Description
Technical field
This application involves piezoelectric driving technology fields, more particularly to a kind of piezoelectric element resonance compensation circuit and method.
Background technology
Piezoelectric material can generate electric field because of mechanically deform, and mechanically deform can also be generated because of electric field action, this intrinsic
Electro-mechanical coupling effect piezoelectric material is widely used in engineering.For example, piezoelectric material has been used to make
Intelligence structure, this class formation also have the function of self diagnosis, adaptivity and self-repairability etc. in addition to self-bearing capacity.
If applying pressure to piezoelectric material, it will generate potential difference, referred to as direct piezoelectric effect, otherwise apply voltage, then generate
Mechanical stress, referred to as inverse piezoelectric effect.Piezoelectric material has the function of the conversion between mechanical energy and electric energy and inverse conversion.PZT
(lead titanate piezoelectric ceramics, Piezoelectric Ceramic Transducer) is a kind of lead titanate piezoelectric ceramics material
Material, has the characteristics that direct piezoelectric effect and reversed piezoelcetric effect.In order to enable piezoelectric material to contribute with maximum amplitude, work frequency
Rate needs to operate in resonance point.
Traditional piezoelectric element resonance circuit includes PZT components and series resonant circuit, and PZT components are directly and series resonance
Circuit is connected.The amplitude of piezoelectric element can change because of different operation frequency in traditional piezoelectric element resonance circuit, can not make
Piezoelectric element is maintained at maximum efficiency, and there are ineffective problems.
Invention content
Based on this, it is necessary in view of the above technical problems, provide a kind of piezoelectricity that can improve piezoelectric element working efficiency
Component resonance compensation circuit and method.
A kind of piezoelectric element resonance compensation circuit, the circuit include that drive control circuit, series resonant circuit, operation are put
Big device and piezoelectric element；
Drive control circuit connects series resonant circuit, and piezoelectric element is connected by operational amplifier and series resonant circuit
It connects；
Drive control circuit carries out frequency sweep according to default frequency range to series resonant circuit, and record series resonant circuit is in frequency sweep
Output voltage in the process obtains frequency sweep as a result, when extracting the output voltage maximum of series resonant circuit according to frequency sweep result pair
The frequency answered, obtains series resonance frequency, and the working frequency of piezoelectric element is adjusted according to series resonance frequency.
In one embodiment, the in-phase input end of operational amplifier connects series resonant circuit, operational amplification circuit
Inverting input connects the output end of operational amplifier, and the output end of operational amplifier connects piezoelectric element.
In one embodiment, drive control circuit includes control unit, driving unit and detection unit, and control unit connects
Driving unit is connect, driving unit connects series resonant circuit and piezoelectric element, and detection unit connects series resonant circuit, and detection is single
Member connection control unit.
In one embodiment, series resonant circuit includes inductance, capacitance and resistance, and inductance and capacitance are connected, and inductance
The other end connect driving unit, the other end connecting detection unit and operational amplifier of capacitance, one end of resistance connects capacitance
With the common end of operational amplifier, the common end of the other end connection driving unit and piezoelectric element of resistance.
In one embodiment, control unit MCU.
In one embodiment, MCU connects driving unit by I2C interface or UART interface.
In one embodiment, driving unit is frequency modulation squarer.
In one embodiment, detection unit includes peak detection unit and D/A conversion unit, and peak detection unit connects
D/A conversion unit is connect, peak detection unit connects series resonant circuit, and D/A conversion unit connects control unit.
A kind of piezoelectric element resonance compensation method, the method includes：
Frequency sweep, output of record series resonant circuit during frequency sweep are carried out to series resonant circuit according to default frequency range
Voltage obtains frequency sweep result；Series resonant circuit connects piezoelectric element；
Corresponding frequency when the output voltage maximum of series resonant circuit is extracted according to frequency sweep result, obtains series resonance
Frequency；
The working frequency of piezoelectric element is adjusted according to series resonance frequency.
In one embodiment, frequency sweep is carried out to series resonant circuit according to default frequency range, record series resonant circuit exists
Output voltage during frequency sweep obtains the step of frequency sweep result, including：
Frequency sweep is carried out to series resonant circuit according to default frequency range；
According to predeterminated frequency gradient detect frequency sweep during series resonant circuit corresponding output voltage in different frequency,
Obtain frequency sweep result.
Above-mentioned piezoelectric element resonance compensation circuit and method, including drive control circuit, series resonant circuit operation amplifier
Device and piezoelectric element；Drive control circuit connects series resonant circuit, and piezoelectric element passes through operational amplifier and series resonance electricity
Road connects, and drive control circuit carries out frequency sweep according to default frequency range to series resonant circuit, and record series resonant circuit is in frequency sweep
Output voltage in the process obtains frequency sweep as a result, when extracting the output voltage maximum of series resonant circuit according to frequency sweep result pair
The frequency answered, obtains series resonance frequency, and the working frequency of piezoelectric element is adjusted according to series resonance frequency.Pass through root
Frequency sweep is carried out to series resonance frequency according to default frequency range, and records the output voltage values of series resonant circuit, from frequency sweep result
The series resonance frequency for extracting series resonant circuit adjusts the working frequency of piezoelectric element according to series resonance frequency
Section, so that the amplitude of piezoelectric element output end will not change with the difference of operating frequency, while by the work of piezoelectric element
Working frequency is maintained at maximum efficiency, improves the working efficiency of piezoelectric element.
Description of the drawings
Fig. 1 is the structure diagram of piezoelectric element resonance compensation circuit in one embodiment；
Fig. 2 is the structural schematic diagram of piezoelectric element resonance compensation circuit in one embodiment；
Fig. 3 is the structural schematic diagram of piezoelectric element resonance compensation circuit in another embodiment；
Fig. 4 is the curve signal of piezoelectric element output node amplitude and equivalent real imaginary part curve A frequency ranges in one embodiment
Figure；
Fig. 5 is that the structure that the working frequency of piezoelectric element is adjusted according to series resonance frequency in one embodiment is shown
It is intended to；
Fig. 6 is the wave that the working frequency of piezoelectric element is adjusted according to series resonance frequency in one embodiment
Shape figure；
Fig. 7 is that piezoelectric element output node amplitude and the curve of equivalent real imaginary part curve B frequency ranges show in another embodiment
It is intended to；
Fig. 8 is the structure that the working frequency of piezoelectric element is adjusted according to series resonance frequency in another embodiment
Schematic diagram；
Fig. 9 is that the working frequency of piezoelectric element is adjusted according to series resonance frequency in another embodiment
Oscillogram；
Figure 10 is that piezoelectric element output node amplitude and the curve of equivalent real imaginary part curve C frequency ranges show in another embodiment
It is intended to；
Figure 11 is the knot that the working frequency of piezoelectric element is adjusted according to series resonance frequency in another embodiment
Structure schematic diagram；
Figure 12 is to be adjusted to obtain to the working frequency of piezoelectric element according to series resonance frequency in another embodiment
Oscillogram；
Figure 13 is the flow chart of piezoelectric element resonance compensation method in one embodiment；
Figure 14 is the flow chart of piezoelectric element resonance compensation method in another embodiment；
Figure 15 is the internal structure chart of one embodiment Computer equipment.
Specific implementation mode
It is with reference to the accompanying drawings and embodiments, right in order to make the object, technical solution and advantage of the application be more clearly understood
The application is further elaborated.It should be appreciated that specific embodiment described herein is only used to explain the application, not
For limiting the application.
Piezoelectric element resonance compensation circuit provided by the present application and method can be applied to the environment of metal touch-control application
In.In the environment of metal touch-control, piezoelectric element is when having tranmitting data register signal and finger contacting metal face, wherein tranmitting data register
Signal includes periodical string wave, square wave or triangular wave etc., and portion of energy can be fallen because of finger by receiving signal, and export when
The amplitude of clock signal can reduce, the hair of piezoelectric element resonance compensation circuit provided by the present application and the avoidable the above situation of method
It is raw, improve the working efficiency of piezoelectric element.
In one embodiment, as shown in Figure 1, providing a kind of piezoelectric element resonance compensation circuit, the circuit includes
Drive control circuit 100, series resonant circuit 200, operational amplifier 300 and piezoelectric element 400.
Drive control circuit 100 connect series resonant circuit 200, piezoelectric element 400 by operational amplifier 300 with connect
Resonance circuit 200 connects.
Wherein, drive control circuit 100 carries out frequency sweep according to default frequency range to series resonant circuit 200, and record series connection is humorous
Output voltage of the circuit 200 during frequency sweep that shake obtains frequency sweep as a result, extracting series resonant circuit 200 according to frequency sweep result
Output voltage maximum when corresponding frequency, obtain series resonance frequency, the work according to series resonance frequency to piezoelectric element
Frequency is adjusted.Default frequency range can be selected according to actual application environment, and in one embodiment, it is 2MHz to preset frequency range
~4MHz, i.e. drive control circuit 100 carry out frequency sweep from 2MHz to 4MHz to series resonant circuit 200, during frequency sweep, string
Connection resonance circuit 200 has corresponding output in different frequencies, to output electricity of the series resonant circuit 200 during frequency sweep
Pressure is recorded, and the result recorded is frequency sweep as a result, extracting series resonant circuit 200 from obtained frequency sweep result
Output voltage maximum when corresponding frequency, obtain series resonance frequency, during frequency sweep, series resonant circuit 200 it is defeated
Corresponding frequency is series resonance frequency when going out voltage maximum, is screened, be can extract out by the frequency sweep result to record
The corresponding series resonance frequency of default frequency range carries out the working frequency of piezoelectric element 400 according to obtained series resonance frequency
It adjusts.
Series resonant circuit 200 is according to the driving of drive control circuit 100, the output pair in the working environment of default frequency range
It is answering as a result, in order to enable piezoelectric element to work with maximum amplitude, that is, piezoelectric element working frequency in resonance point
Working frequency is maximum, by the resonance effect of series resonant circuit 200, when series resonant circuit 200 and piezoelectric element 400 reach
When resonance, the working frequency of piezoelectric element 400 is maximum, therefore, according to the series resonance frequency of series resonant circuit 200 to piezoelectricity
The working frequency of component 400 is adjusted, and the working efficiency of piezoelectric element 400 may make to reach maximum.
Operational amplifier 300 is a kind of integrated circuit including many transistors, and piezoelectric element 400 passes through operational amplifier
300 connect with series resonant circuit 200, in actual working environment, piezoelectric element 400 by used piezoelectric material not
Together, the performance of piezoelectric element 400 is easy aging at any time, and is influenced by ambient temperature is different degrees of, piezoelectric element 400
It is connect with series resonant circuit 200 by operational amplifier 300, the aging and by temperature at any time of piezoelectric element 400 can be isolated
It influences to influence caused by entire circuit, to ensure accurately to extract the series resonance of series resonant circuit 200 in default frequency range
Frequency, when the in-phase input end of operational amplifier 300 accesses input signal, when inverting input is connect with output end, operation is put
Big device 300 is alternatively arranged as buffer, improves the convenience of data processing.
Piezoelectric element 400 is made out of a piezoelectric material, and there is piezoelectric effect, piezoelectric material can generate electricity because of mechanically deform
, mechanically deform can also be generated because of electric field action, the settings such as material, the model of piezoelectric element 400 are not unique, in practical work
Make in environment, can select suitable piezoelectric material according to actual needs, is PZT groups by piezoelectric element 400 in the present embodiment
Part, PZT are a kind of lead lanthanum zirconate titanate (PLZT) electrooptical ceramics materials, have the characteristics that direct piezoelectric effect and reversed piezoelcetric effect, but worked
The performance of Cheng Zhong, PZT component is also easy aging at any time, and is influenced by ambient temperature, and PZT components pass through operation amplifier
Device 300 is connect with series resonant circuit 200, and operational amplifier 300 can be isolated PZT components and aging and be affected by temperature at any time
It is not belonging to the circuit in series resonant circuit 200 to influence, PZT components caused by entire circuit, to series resonant circuit 200
Output voltage size it is unrelated with the impedance magnitude of PZT components, with ensure accurately extract series resonant circuit in default frequency range
200 series resonance frequency.
Above-mentioned piezoelectric element resonance compensation circuit by carrying out frequency sweep to series resonance frequency according to default frequency range, and is remembered
The output voltage values for recording series resonant circuit 200 extract the series resonance frequency of series resonant circuit 200 from frequency sweep result
Rate is adjusted the working frequency of piezoelectric element according to series resonance frequency, so that 400 output end of piezoelectric element shakes
Width will not change with the difference of operating frequency, while the working frequency of piezoelectric element 400 is maintained at maximum efficiency, carry
The high working efficiency of piezoelectric element 400.
In one embodiment, as shown in Fig. 2, the in-phase input end of operational amplifier 300 connects series resonant circuit
200, the output end of the inverting input connection operational amplifier 300 of operational amplifier 300, the output end of operational amplifier 300
Connect piezoelectric element 400.Specifically, the output end of the in-phase input end connection series resonant circuit 200 of operational amplifier 300,
Operational amplifier 300 can receive the output voltage of series resonant circuit 200, so that drive control circuit 100 is to series resonance electricity
The output voltage on road 200 is further processed, the output of the inverting input and operational amplifier 300 of operational amplifier 300
Output feedback to inverting input is formed negative-feedback and is convenient for by regarding operational amplifier 300 as buffer by end connection
The gain of entire circuit is adjusted in drive control circuit, improves the control convenience to circuit.
In one embodiment, as shown in Fig. 2, drive control circuit 100 includes control unit 110,120 and of driving unit
Detection unit 130, control unit 110 connect driving unit 120, and driving unit 120 connects series resonant circuit 200 and piezoelectricity group
Part 400, detection unit 130 connect series resonant circuit 200, and detection unit 130 connects control unit 110.
Control unit 110 controls driving unit 120 and detection unit 130, and is carried out to the work of entire circuit
Control and adjusting, control unit 110 controls driving unit 120 and carries out frequency sweep to series resonant circuit 200, and controls detection unit
It records output voltage of the series resonant circuit 200 during frequency sweep and obtains frequency sweep as a result, control unit 110 can be according to frequency sweep knot
Fruit extracts corresponding frequency when the output voltage maximum of series resonant circuit 200, series resonance frequency is obtained, to control list
Member 110 can be adjusted the working frequency of piezoelectric element 400 according to series resonance frequency.It is appreciated that control unit 110
Setting is not unique, and in one embodiment, control unit 110 is MCU (Micro Control Unit, micro-control unit),
Micro-control unit is also known as one chip microcomputer or microcontroller, is that the frequency of central processing unit is done appropriate reduction with specification,
And the perimeter interfaces such as memory, counter, USB, A/D conversion, UART, PLC, DMA or even LCD driving circuits are all incorporated into list
On one chip, the computer of chip-scale is formed, various combination control is done for different application scenarios.By MCU to entire circuit
Work controlled, multimachine and distributed AC servo system can be conveniently realized, keep the efficiency and reliability of entire control system big
To improve.
Driving unit 120 carries out frequency sweep according to the control of control unit 110 to series resonant circuit 200, implements at one
In example, when control unit 110 is MCU, MCU controls driving unit by I2C interface or UART interface, controls driving unit 120
Frequency sweep is carried out to series resonant circuit 200 according to default frequency range.It is appreciated that the setting of driving unit 120 is not unique, it can
Frequency sweep accurately is carried out to series resonant circuit 200, in one embodiment, driving unit 120 is frequency modulation squarer,
The frequency that frequency modulation squarer generates can need to be adjusted according to real work, so as to be pressed to series resonant circuit 200
Frequency sweep is carried out according to default frequency range, improves the accuracy and reliability of frequency sweep control.
Output of the detection unit 130 according to the control record series resonant circuit 200 of control unit 110 during frequency sweep
Voltage obtain frequency sweep as a result, and obtained frequency sweep result is sent to control unit 110, control unit 110 is further according to frequency sweep knot
Fruit extracts corresponding frequency when the output voltage maximum of series resonant circuit 200, obtains series resonance frequency, specifically, inspection
Surveying unit 130 can be corresponding defeated in different frequency according to series resonant circuit 200 during predeterminated frequency gradient detection frequency sweep
Go out voltage, obtains frequency sweep as a result, predeterminated frequency gradient can need be configured according to real work, in default frequency range, every
The output voltage of series resonant circuit 200 is detected every a predeterminated frequency gradient, is 2MHz~4MHz with default frequency range
For, predeterminated frequency gradient can be set to 10KHz, i.e., in 2MHz~4MHz frequency ranges to series resonant circuit 200 into
When row frequency sweep, at interval of 10KHz record a series resonant circuit 200 output voltage, i.e., according to 2.01MHz, 2.02MHz,
2.03MHz, until the interval of 4MHz records the output voltage of the corresponding series resonant circuit of each frequency 200, obtain frequency sweep result.
In one embodiment, as shown in figure 3, detection unit 130 includes peak detection unit 132 and D/A conversion unit
134, peak detection unit 132 connects D/A conversion unit 134, and peak detection unit 132 connects series resonant circuit 200, number
Mould converting unit 134 connects control unit 110.Peak detection unit 132 is by the output of series resonant circuit during frequency sweep 200
The peak value of voltage waveform is screened, and is filtered out the corresponding output voltage of peak-peak and is exported to D/A conversion unit 134, by
The analog quantity of reception is converted to digital quantity by D/A conversion unit 134, is retransmited to control unit 110, is improved control unit 110
To the convenience of data processing, specifically, peak detection unit 132 is peak detector, and D/A conversion unit 134 turns for digital-to-analogue
Parallel operation.
In one embodiment, as shown in figure 3, series resonant circuit 200 includes inductance L1, capacitance C1 and resistance R1, electricity
Feel L1 and capacitance C1 series connection, and the other end of inductance L1 connects driving unit 120, the other end connecting detection unit of capacitance C1
The common end of one end connection the capacitance C1 and operational amplifier 300 of 130 and operational amplifier 300, resistance R1, resistance R1's is another
The common end of end connection driving unit 120 and piezoelectric element 400.
In one embodiment, using in circuit the common end of operational amplifier 300 and piezoelectric element 400 as TX nodes,
The connecting node of the output end of operational amplifier 300 and the input terminal of piezoelectric element 400 is TX nodes, and TX nodes are by operation amplifier
The output voltage of device 300 is exported to the input terminal of piezoelectric element 400, and TX nodes are as transmission node, for observing piezoelectric element
400 voltage change, as shown in figure 4, with 3.3V square waves, f=3MHz is as series resonance frequency in A frequency ranges to PZT components
Working frequency be adjusted, PZT component equivalents RC values are as shown in figure 5, R=3.64 Ω, C=1.18nF, obtain at this time at this time
The working frequency of PZT components is as shown in fig. 6, TX amp.=2V, f=3MHz；As shown in fig. 7, with 3.3V square waves, f=3MHz makees
The working frequency of PZT components is adjusted in B frequency ranges for series resonance frequency, at this time PZT component equivalents RC values such as Fig. 8 institutes
Show, R=242 Ω, C=7.21nF, the working frequency of obtained PZT components is as shown in figure 9, TX amp.=2V, f=3MHz；Such as
Shown in Figure 10, with 3.3V square waves, f=3MHz adjusts the working frequency of PZT components in C frequency ranges as series resonance frequency
Section, PZT component equivalents RC values are as shown in figure 11 at this time, and R=3.72 Ω, C=641pF, the working frequency of obtained PZT components is such as
Shown in Figure 12, TX amp.=2V, f=3MHz, wherein in Fig. 4, Fig. 7 and Figure 10,1. curve indicates that the Z impedances of PZT components are bent
Line, 2. curve indicate PZT components real impedance curve, 3. curve indicate PZT components imaginary impedance curve, 4. curve indicate
The curve of TX amp..By the above test data it is found that when carrying out frequency sweep to PZT components according to series resonance frequency, PZT groups
The working frequency of part will not change because of PZT in the equiva lent impedance of different frequency, to improve the working efficiency of piezoelectric element.
For ease of more fully understanding above-mentioned piezoelectric element resonance compensation circuit, carried out with reference to specific embodiment detailed
It illustrates.
Piezoelectric element resonance compensation circuit includes drive control circuit 100, series resonant circuit 200, operational amplifier 300
With piezoelectric element 400, wherein series resonant circuit 200 includes inductance L1, capacitance C1 and resistance R1, and drive control circuit 100 is wrapped
Control unit 110, driving unit 120 and detection unit 130 are included, detection unit 130 includes that peak detection unit 132 and digital-to-analogue turn
Unit 134 is changed, in one embodiment, control unit 110 can be MCU, and driving unit 120 can be frequency modulation squarer, pressure
Electrical component 400 can be PZT components.
MCU connection frequency modulation squarers, frequency modulation squarer connect the common end of resistance R1 and PZT component, resistance
The common end of the other end connection capacitance C1 and 300 in-phase input end of operational amplifier of R1, capacitance C1 and inductance L1 series connection, inductance
The other end of L1 connects frequency modulation squarer, and resistance R1 connects peak detection unit 132, peak value inspection with the common end of capacitance C1
It surveys unit 132 and connects D/A conversion unit 134, D/A conversion unit 134 connects MCU, the in-phase input end of operational amplifier 300
Connect the common end of resistance R1 and capacitance C1, the output of the inverting input connection operational amplifier 300 of operational amplifier 300
End, the output end of one end connection operational amplifier 300 of PZT components, the other end connection resistance R1 and frequency modulation square wave of PZT components
The common end of generator.MCU by I2C interface or UART interface control frequency modulation squarer to series resonant circuit 200 into
Row frequency sweep, peak detection unit 132 sieve the peak value of the output voltage waveforms of series resonant circuit during frequency sweep 200
Choosing filters out the corresponding output voltage of peak-peak and exports to D/A conversion unit 134, will be connect by D/A conversion unit 134
The analog quantity of receipts is converted to digital quantity, retransmits to MCU, MCU and extracts the output of series resonant circuit 200 according to frequency sweep result
Corresponding frequency when voltage maximum, obtains series resonance frequency, and according to series resonance frequency to the working frequencies of PZT components into
Row is adjusted, so that the amplitude of PZT component output ends will not change with the difference of operating frequency, while by PZT components
Working frequency is maintained at maximum efficiency, improves the working efficiency of PZT components.
PZT components are connect by operational amplifier 300 with series resonant circuit 200, and the aging at any time of PZT components can be isolated
And be affected by temperature to influence caused by entire circuit, to ensure accurately to extract series resonant circuit 200 in default frequency range
Series resonance frequency, operational amplifier 300 is alternatively arranged as buffer, so that MCU is to the output voltage of series resonant circuit 200
It is further processed, improves the convenience of data processing.
In one embodiment, as shown in figure 13, a kind of piezoelectric element resonance compensation method is provided, the method includes
Step S100, step S200 and step S300.
Step S100 carries out frequency sweep according to default frequency range to series resonant circuit, and record series resonant circuit is in frequency sweep mistake
Output voltage in journey obtains frequency sweep result.
Drive control circuit 100 carries out frequency sweep according to default frequency range to series resonant circuit 200, records series resonant circuit
200 output voltage during frequency sweep obtains frequency sweep as a result, series resonant circuit 200 connects piezoelectric element 400, series resonance
Circuit 200 exports corresponding result according to the driving of drive control circuit 100 in the working environment of default frequency range.
Step S200 extracts corresponding frequency when the output voltage maximum of series resonant circuit according to frequency sweep result, obtains
To series resonance frequency.
The output voltage that drive control circuit 100 extracts series resonant circuit 200 according to obtained frequency sweep result is maximum
When corresponding frequency, obtain series resonance frequency, screened by the frequency sweep result to record, can extract out default frequency range pair
The series resonance frequency answered.
Step S300 is adjusted the working frequency of piezoelectric element according to series resonance frequency.
In order to enable piezoelectric element to work with maximum amplitude, that is, piezoelectric element working frequency in resonance point work
Working frequency is maximum, by the resonance effect of series resonant circuit 200, when series resonant circuit 200 and piezoelectric element 400 reach altogether
When shaking, the working frequency of piezoelectric element 400 is maximum, therefore, according to the series resonance frequency of series resonant circuit 200 to piezoelectricity group
The working frequency of part 400 is adjusted, and the working efficiency of piezoelectric element 400 may make to reach maximum.
In one embodiment, as shown in figure 14, step S100 includes step S120 and step S140.
Step S120 carries out frequency sweep according to default frequency range to series resonant circuit.
Drive control circuit 100 carries out frequency sweep according to default frequency range to series resonant circuit 200, and frequency sweep is by output signal
In a frequency range, the process of consecutive variations, default frequency range can be according to actual application environments from high to low or from low to high for frequency
It is selected, in one embodiment, it is 2MHz~4MHz, i.e. drive control circuit 100 from 2MHz to 4MHz pair to preset frequency range
Series resonant circuit 200 carries out frequency sweep.
Step S140, series resonant circuit is corresponding in different frequency during detecting frequency sweep according to predeterminated frequency gradient
Output voltage obtains frequency sweep result.
Predeterminated frequency gradient can need to be configured according to real work, in default frequency range, at interval of a default frequency
Rate gradient is detected the output voltage of series resonant circuit 200, by taking default frequency range is 2MHz~4MHz as an example, can will preset
Frequency gradient is set as 10KHz, i.e., when carrying out frequency sweep to series resonant circuit 200 in 2MHz~4MHz frequency ranges, every
Every 10KHz record a series resonant circuit 200 output voltage, i.e., according to 2.01MHz, 2.02MHz, 2.03MHz, until
The interval of 4MHz records the output voltage of the corresponding series resonant circuit of each frequency 200, obtains frequency sweep result.
It should be understood that although each step in the flow chart of Figure 13-14 is shown successively according to the instruction of arrow,
Be these steps it is not that the inevitable sequence indicated according to arrow executes successively.Unless expressly stating otherwise herein, these steps
There is no stringent sequences to limit for rapid execution, these steps can execute in other order.Moreover, in Figure 13-14 extremely
Few a part of step may include that either these sub-steps of multiple stages or stage are not necessarily same to multiple sub-steps
Moment executes completion, but can execute at different times, and the execution sequence in these sub-steps or stage is also not necessarily
It carries out successively, but can either the sub-step of other steps or at least part in stage in turn or are handed over other steps
Alternately execute.
In one embodiment, a kind of computer equipment is provided, which can be server, internal junction
Composition can be as shown in 15 figures.The computer equipment include the processor connected by system bus, memory, network interface and
Database.Wherein, the processor of the computer equipment is for providing calculating and control ability.The memory packet of the computer equipment
Include non-volatile memory medium, built-in storage.The non-volatile memory medium is stored with operating system, computer program and data
Library.The built-in storage provides environment for the operation of operating system and computer program in non-volatile memory medium.The calculating
The database of machine equipment is for storing the data such as frequency sweep result and series resonance frequency.The network interface of the computer equipment is used for
It is communicated by network connection with external terminal.To realize a kind of piezoelectric element resonance when the computer program is executed by processor
Compensation method.
It will be understood by those skilled in the art that structure shown in Figure 15, only with the relevant part of application scheme
The block diagram of structure, does not constitute the restriction for the computer equipment being applied thereon to application scheme, and specific computer is set
Standby may include either combining certain components than more or fewer components as shown in the figure or being arranged with different components.
In one embodiment, a kind of computer equipment, including memory and processor are provided, is stored in memory
Computer program, the processor realize following steps when executing computer program：According to default frequency range to series resonant circuit into
Row frequency sweep, output voltage of record series resonant circuit during frequency sweep obtain frequency sweep result；Series resonant circuit connection pressure
Electrical component；Corresponding frequency when the output voltage maximum of series resonant circuit is extracted according to frequency sweep result, obtains series resonance
Frequency；The working frequency of piezoelectric element is adjusted according to series resonance frequency.
In one embodiment, following steps are also realized when processor executes computer program：According to default frequency range to string
Join resonance circuit and carries out frequency sweep；Series resonant circuit is corresponded in different frequency during detecting frequency sweep according to predeterminated frequency gradient
Output voltage, obtain frequency sweep result.
In one embodiment, a kind of computer readable storage medium is provided, computer program is stored thereon with, is calculated
Machine program realizes following steps when being executed by processor：Frequency sweep, record series connection are carried out to series resonant circuit according to default frequency range
Output voltage of resonance circuit during frequency sweep obtains frequency sweep result；Series resonant circuit connects piezoelectric element；According to frequency sweep
As a result corresponding frequency when the output voltage maximum of series resonant circuit is extracted, series resonance frequency is obtained；It is humorous according to connecting
The working frequency of piezoelectric element is adjusted in vibration frequency.
In one embodiment, following steps are also realized when computer program is executed by processor：According to default frequency range pair
Series resonant circuit carries out frequency sweep；Series resonant circuit is in different frequency pair during detecting frequency sweep according to predeterminated frequency gradient
The output voltage answered obtains frequency sweep result.
Above-mentioned piezoelectric element resonance compensation method, computer equipment and storage medium, including drive control circuit, series connection it is humorous
Shake circuit computing amplifier and piezoelectric element；Drive control circuit connects series resonant circuit, and piezoelectric element passes through operation amplifier
Device is connect with series resonant circuit, and drive control circuit carries out frequency sweep, record series connection according to default frequency range to series resonant circuit
Output voltage of resonance circuit during frequency sweep obtains frequency sweep as a result, extracting the defeated of series resonant circuit according to frequency sweep result
Go out corresponding frequency when voltage maximum, obtain series resonance frequency, according to series resonance frequency to the working frequency of piezoelectric element
It is adjusted.By carrying out frequency sweep to series resonance frequency according to default frequency range, and record the output voltage of series resonant circuit
Value, extracts the series resonance frequency of series resonant circuit, according to series resonance frequency to piezoelectric element from frequency sweep result
Working frequency is adjusted, so that the amplitude of piezoelectric element output end will not change with the difference of operating frequency, simultaneously
The working frequency of piezoelectric element is maintained at maximum efficiency, improves the working efficiency of piezoelectric element.
One of ordinary skill in the art will appreciate that realizing all or part of flow in above-described embodiment method, being can be with
Relevant hardware is instructed to complete by computer program, the computer program can be stored in a non-volatile computer
In read/write memory medium, the computer program is when being executed, it may include such as the flow of the embodiment of above-mentioned each method.Wherein,
Any reference to memory, storage, database or other media used in each embodiment provided herein,
Including non-volatile and/or volatile memory.Nonvolatile memory may include read-only memory (ROM), programming ROM
(PROM), electrically programmable ROM (EPROM), electrically erasable ROM (EEPROM) or flash memory.Volatile memory may include
Random access memory (RAM) or external cache.By way of illustration and not limitation, RAM is available in many forms,
Such as static state RAM (SRAM), dynamic ram (DRAM), synchronous dram (SDRAM), double data rate sdram (DDRSDRAM), enhancing
Type SDRAM (ESDRAM), synchronization link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM
(RDRAM), direct memory bus dynamic ram (DRDRAM) and memory bus dynamic ram (RDRAM) etc..
Each technical characteristic of above example can be combined arbitrarily, to keep description succinct, not to above-described embodiment
In each technical characteristic it is all possible combination be all described, as long as however, the combination of these technical characteristics be not present lance
Shield is all considered to be the range of this specification record.
The several embodiments of the application above described embodiment only expresses, the description thereof is more specific and detailed, but simultaneously
It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art
It says, under the premise of not departing from the application design, various modifications and improvements can be made, these belong to the protection of the application
Range.Therefore, the protection domain of the application patent should be determined by the appended claims.
Claims (10)
1. a kind of piezoelectric element resonance compensation circuit, which is characterized in that the circuit includes drive control circuit, series resonance electricity
Road, operational amplifier and piezoelectric element；
The drive control circuit connects the series resonant circuit, the piezoelectric element by the operational amplifier with it is described
Series resonant circuit connects；
The drive control circuit carries out frequency sweep according to default frequency range to the series resonant circuit, records the series resonance electricity
Output voltage of road during frequency sweep obtains frequency sweep as a result, extracting the series resonant circuit according to the frequency sweep result
Corresponding frequency, obtains series resonance frequency when output voltage maximum, according to the series resonance frequency to the piezoelectric element
Working frequency be adjusted.
2. piezoelectric element resonance compensation circuit according to claim 1, which is characterized in that the same phase of the operational amplifier
Input terminal connects the series resonant circuit, and the inverting input of the operational amplifier connects the output of the operational amplifier
The output end at end, the operational amplifier connects the piezoelectric element.
3. piezoelectric element resonance compensation circuit according to claim 1, which is characterized in that the drive control circuit includes
Control unit, driving unit and detection unit, described control unit connect the driving unit, described in the driving unit connection
Series resonant circuit and the piezoelectric element, the detection unit connect the series resonant circuit, the detection unit connection
Described control unit.
4. piezoelectric element resonance compensation circuit according to claim 3, which is characterized in that the series resonant circuit includes
Inductance, capacitance and resistance, the inductance and capacitance series connection, and the other end of the inductance connects the driving unit, institute
The other end for stating capacitance connects the detection unit and the operational amplifier, and one end of the resistance connects the capacitance and institute
The common end of operational amplifier is stated, the other end of the resistance connects the common end of the driving unit and the piezoelectric element.
5. piezoelectric element resonance compensation circuit according to claim 3, which is characterized in that described control unit MCU.
6. piezoelectric element resonance compensation circuit according to claim 5, which is characterized in that the MCU by I2C interface or
UART interface connects the driving unit.
7. piezoelectric element resonance compensation circuit according to claim 3, which is characterized in that the driving unit is frequency modulation side
Baud generator.
8. piezoelectric element resonance compensation circuit according to claim 3, which is characterized in that the detection unit includes peak value
Detection unit and D/A conversion unit, the peak detection unit connect the D/A conversion unit, the peak detection unit
The series resonant circuit is connected, the D/A conversion unit connects described control unit.
9. a kind of piezoelectric element resonance compensation method, which is characterized in that the method includes：
Frequency sweep is carried out to series resonant circuit according to default frequency range, records output of series resonant circuit during frequency sweep
Voltage obtains frequency sweep result；The series resonant circuit connects piezoelectric element；
Corresponding frequency, is connected when extracting the output voltage maximum of the series resonant circuit according to the frequency sweep result
Resonant frequency；
The working frequency of the piezoelectric element is adjusted according to the series resonance frequency.
10. piezoelectric element resonance compensation method according to claim 9, which is characterized in that the basis presets frequency range pair
Series resonant circuit carries out frequency sweep, records output voltage of series resonant circuit during frequency sweep and obtains frequency sweep result
Step, including：
Frequency sweep is carried out to series resonant circuit according to default frequency range；
According to predeterminated frequency gradient detect frequency sweep during the series resonant circuit corresponding output voltage in different frequency,
Obtain frequency sweep result.
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| CN201810461748X | 2018-05-15 | ||
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201742320U (en) * | 2010-05-18 | 2011-02-09 | 嘉兴学院 | Vibrator capable of automatically tracking frequency |
| US8508104B2 (en) * | 2009-09-18 | 2013-08-13 | Murata Manufacturing Co., Ltd. | Piezoelectric actuator driver circuit |
| CN104768661A (en) * | 2012-09-10 | 2015-07-08 | 韦伯超声波有限公司 | Method and circuit arrangement for determining a working range of an ultrasonic vibrating unit |
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2018
- 2018-05-22 CN CN201810495087.2A patent/CN108574425B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8508104B2 (en) * | 2009-09-18 | 2013-08-13 | Murata Manufacturing Co., Ltd. | Piezoelectric actuator driver circuit |
| CN201742320U (en) * | 2010-05-18 | 2011-02-09 | 嘉兴学院 | Vibrator capable of automatically tracking frequency |
| CN104768661A (en) * | 2012-09-10 | 2015-07-08 | 韦伯超声波有限公司 | Method and circuit arrangement for determining a working range of an ultrasonic vibrating unit |
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