CN107939658B - The drive system of piezoelectric pump - Google Patents
The drive system of piezoelectric pump Download PDFInfo
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- CN107939658B CN107939658B CN201610891780.2A CN201610891780A CN107939658B CN 107939658 B CN107939658 B CN 107939658B CN 201610891780 A CN201610891780 A CN 201610891780A CN 107939658 B CN107939658 B CN 107939658B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/06—Control using electricity
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B35/00—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for
- F04B35/04—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for the means being electric
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Reciprocating Pumps (AREA)
- General Electrical Machinery Utilizing Piezoelectricity, Electrostriction Or Magnetostriction (AREA)
Abstract
This case includes about a kind of drive system: voltage transformation module, the first direct current is converted to the second DC voltage；Frequency control circuit shakes and finds the resonance working frequency of piezoelectric actuator using circuit, and corresponds to output switching signal according to resonance working frequency；Second DC voltage is converted to alternating voltage according to switching signal by voltage switching module, to drive piezoelectric actuator；Detection module, comprising baroceptor and microcontroller, baroceptor detects the pneumatic flow in piezoelectric pump and corresponding output pressure flow detection value, microcontroller receive pneumatic flow detected value, and controllable voltage transformation module adjusts output voltage, adjusts the pneumatic flow in piezoelectric pump whereby.
Description
[technical field]
This case controls the work frequency of piezoelectric actuator about a kind of drive system, espespecially a kind of output variable voltage
Rate is the drive system of variable piezoelectric pump.
[background technique]
General piezoelectric pump is in running, it usually needs drive system drives piezoelectric actuated in piezoelectric pump providing electric energy
Device operates piezoelectric actuator periodically, and then drives the corresponding running of piezoelectricity air pump.
The drive system of piezoelectric pump substantially divides three kinds of types at present.The first drive system is the fixed voltage of output, together
When control piezoelectric actuator working frequency be fix.Second of drive system is the variable voltage of output, while controlling piezoelectricity
The working frequency of actuator is to fix.The third drive system is the variable voltage of output, while controlling the work of piezoelectric actuator
Working frequency is variable.
However disadvantage is but individually present in above-mentioned three kinds of drive systems.Firstly, the first drive system is directed to, due to piezoelectric pump
Cause piezoelectric actuator thickness degree different in practice as the tolerance on different framework and processing procedure and there is different characteristics,
Therefore in the case where the working frequency of the fixed voltage of output while piezoelectric actuator is fixed, the air pressure of piezoelectric pump output
Difference, in this way, the control mode of the first drive system can only take a rough value, it can not be in response to different piezoelectricity
The performance and output flow velocity of pump and effective accurate control piezoelectric pump.For second of drive system, actually due to piezoelectric pump
There is different characteristics with the different thickness degree of different framework and piezoelectric actuator, so even different piezoelectric pumps
Its optimal working frequency point be difference, such as three piezoelectric pumps optimal working frequency be respectively 100kHz, 105kHz and
95kHz, drive system can control the working frequency of the piezoelectric actuator of these piezoelectric pumps only also to fix, such as selection compromise
The 100kHz of central point is driving 105kHz and 95kHz so in order to reach homogeneity to control the working frequency of these piezoelectric pumps
Piezoelectric pump may just need higher or lower voltage, can be only achieved homogeneity, and excessively high voltage will likely puncture piezoelectricity
Actuator makes piezoelectric actuator lose piezoelectric property, in turn results in the damage of piezoelectric pump.The third drive system can then make piezoelectricity
The performance of pump rising or falling rapidly, the working frequency for causing piezoelectric actuator can control narrows, so that the third drives
System is simultaneously not easy to use and applicability is bad.
Therefore, how to develop a kind of drive system of piezoelectric pump for overcoming disadvantages mentioned above, actually demand urgent at present.
[summary of the invention]
The main purpose of this case is to provide a kind of drive system of piezoelectric pump, in order to the known piezoelectric pump of solution with frequency and electricity
Pressure is fixed drive system control mode, is fixed with frequency and the drive system control mode and frequency of voltage variable can
Become and the drive system control mode of voltage fixation, it is caused that there is the performance and output that effectively can not accurately control piezoelectric pump
Flow velocity, the damage for be easy to causeing piezoelectric pump or the missings such as not easy to use and applicability is bad, different above-mentioned drive system controlling party
Formula, adopt with frequency can modulation and voltage can modulation drive system control mode, reach maximum compatibility and the control that is easiest to
The pump driving circuit of system, is provided with demand utilization in this industry.
In order to achieve the above object, a preferable state sample implementation of this case is to provide a kind of drive system, to drive in piezoelectric pump
The piezoelectric actuator with first end and second end, include: voltage transformation module, the first DC voltage is converted to the
Two DC voltages；Frequency control circuit is electrically connected to voltage transformation module and piezoelectric actuator, seeks to be shaken using circuit
The resonance working frequency of piezoelectric actuator is looked for, and corresponds to output switching signal according to resonance working frequency；Voltage switching module,
It is electrically connected to frequency control circuit, the second DC voltage is converted to alternating voltage according to switching signal, to be applied to
Piezoelectric actuator driving running；Division module is electrically connected to voltage transformation module；And detection module, it include baroceptor
And microcontroller, baroceptor are connected to piezoelectric pump, to detect the pneumatic flow in piezoelectric pump and according to testing result pair
Output pressure flow detection value is answered, microcontroller is electrically connected with baroceptor and division module, to examine by pneumatic flow
Measured value learns the actual pressure variable quantity of a time section, and compares actual pressure variable quantity and preset pressure variable quantity, with root
Make voltage modulus of conversion to voltage transformation module according to comparison result output adjustment signal, and by division module transmission adjustment signal
Block adjusts the second DC voltage according to adjustment signal, to adjust the pneumatic flow in piezoelectric pump, approaches actual pressure variable quantity
It is consistent in preset pressure variable quantity.
[Detailed description of the invention]
Fig. 1 is the thin portion circuit diagram of the drive system of this case preferred embodiment.
Fig. 2 is the exemplary plot of actual pressure variable quantity and preset pressure variable quantity.
[symbol description]
10: drive system
11: voltage transformation module
110: mode selector switch
12: frequency control circuit
121: comparator
16: piezoelectric pump
161: piezoelectric actuator
1611: first end
1612: second end
13: voltage switching module
14: detection module
141: baroceptor
142: microcontroller
15: division module
2: power supply
R1: first resistor
R2: second resistance
R3: 3rd resistor
R4: the four resistance
R5: the five resistance
R6: the six resistance
R7: the seven resistance
R8: the eight resistance
R9: the nine resistance
C1: first capacitor
C2: the second capacitor
C3: third capacitor
Q1: first switch
Q2: second switch
V+: positive voltage
V-: negative voltage
Vd1: the first DC voltage
Vd2: the second DC voltage
V1: first voltage
V2: second voltage
Vc: micro voltage
G: ground terminal
T0, t1, t2: time
A: input terminal
B: output end
C: receiving end
[specific embodiment]
The some exemplary embodiments for embodying this case features and advantages will describe in detail in the explanation of back segment.It should be understood that
This case can have various variations in different aspects, all not depart from the range of this case, and explanation therein and schema
It is illustrated as being used in itself, and nand architecture is in limitation this case.
Referring to Fig. 1, its electrical block diagram for the drive system of this case preferred embodiment.As shown in Figure 1, driving
For system 10 to drive the piezoelectric actuator 161 in a piezoelectric pump 16, drive system 10 includes a voltage transformation module 11, one
Frequency control circuit 12, a voltage switching module 13, a detection module 14 and a division module 15.
Voltage transformation module 11 can by but be not limited to be made of a boost converter, in an input terminal receive one electricity
The first DC voltage Vd1 that source 2 is exported, and be converted to one second DC voltage Vd2 and exported in an output end.
Frequency control circuit 12 is electrically connected to the output end and piezoelectric actuator 161 of voltage transformation module 11, to utilize
Circuit shakes and finds a resonance working frequency of piezoelectric actuator 161, and corresponds to according to resonance working frequency and export all
Change signal.
Voltage switching module 13 is electrically connected to the output end of voltage transformation module 11, frequency control circuit 12 and piezoelectric actuated
Device 161, and voltage switching module 13 carries out the switching of on or off according to switching signal, makes voltage switching module 13 by
Two DC voltage Vd2 are converted to alternating voltage, to drive the running of piezoelectric actuator 161 in resonance working frequency, and then make piezoelectricity
16 running of pump.
Division module 15 is electrically connected between voltage transformation module 11 and detection module 14, to will be from 14 institute of detection module
The signal received is divided, to be supplied to voltage transformation module 11.
Detection module 14 includes baroceptor 141 and microcontroller 142.Baroceptor 141 is connected to piezoelectric pump 16,
To detect the pneumatic flow in piezoelectric pump 16, and according to testing result one pneumatic flow detected value of corresponding output.Microcontroller
142 are electrically connected with baroceptor 141 and division module 15, and are preset with a preset pressure variable quantity, microcontroller 142 to
The pneumatic flow detected value exported by baroceptor 141 learns an actual pressure of the piezoelectric pump 16 in a time section
Variable quantity, and actual pressure variable quantity and preset pressure variable quantity are compared, extremely divided with exporting an adjustment signal according to comparison result
Die block 15, wherein adjustment signal can be but be not limited to pulse width modulation signal, and division module 15 is just by adjustment signal point
It is sent to voltage transformation module 11 after pressure, voltage transformation module 11 is made to adjust the second DC voltage according to the adjustment signal after partial pressure
Vd2 adjusts the pneumatic flow in piezoelectric pump 16, so that actual pressure variable quantity is adjusted to and preset pressure variable quantity one whereby
It causes.
From the foregoing, it will be observed that the drive system 10 of this case can by frequency control circuit 12 by circuit shake in the way of find pressure
The resonance working frequency of electric actuator 161, and then operate piezoelectric actuator 161 in resonance working frequency, therefore the drive of this case
Working frequency needed for dynamic system 10 can be automatically adjusted to piezoelectric actuator 161 according to the characteristic difference of piezoelectric actuator 161.Separately
Outside, the microcontroller 142 of this case may compare actual pressure variable quantity and preset pressure variable quantity, and then output adjustment signal, make
Voltage transformation module 11 accordingly adjusts the second DC voltage Vd2 according to adjustment signal, adjusts the gas in piezoelectric pump 16 whereby
Flow is pressed, so that actual pressure variable quantity levels off to preset pressure variable quantity, so even the characteristic and frame of every kind of piezoelectric pump 16
Structure is different, and the drive system 10 of this case can still make actual pressure variable quantity be adjusted to consistent with preset pressure variable quantity, therefore
10 applicability of drive system of this case is preferable.It is with exportable the second variable DC voltage of the drive system 10 due to this case
Vd2 to piezoelectric actuator 161, while can according to piezoelectric actuator 161 characteristic and control the work frequency of piezoelectric actuator 161
Rate, therefore lacked compared to possessed by the drive system of aforementioned known piezoelectric pump, the drive system 10 of this case can reach effectively
Accurate control piezoelectric pump 16 performance and export flow velocity, avoid the damage of piezoelectric pump 16 and the preferable effect of applicability.
Referring again to Fig. 1, frequency control circuit 12 has an input terminal A, an output end B, a receiving end C and control line
Road, the input terminal A of frequency control circuit 12 receive the second DC voltage Vd2 that voltage transformation module 11 is exported, frequency control
The output end B of circuit 12 is electrically connected voltage switching module 13, and the receiving end C of frequency control circuit 12 is electrically connected piezoelectric actuator
161 first end 1611, and the micro voltage Vc that piezoelectric actuator 161 is exported is received, and route is controlled in electrical connection input terminal A
Route partial pressure afterwards generates an a first voltage V1 and second voltage V2.
And voltage switching module 13 has an input terminal, is electrically connected for the output end B with frequency control circuit 12, to connect
It receives the first voltage V1 and second voltage V2 that frequency control circuit 12 is compared and selects the positive voltage V+ exported or a negative electricity
V- is pressed, and voltage switching module 13 has an output end, is electrically connected, will be connect for the second end 1612 with piezoelectric actuator 161
The positive voltage V+ or negative voltage V- of receipts are sent to piezoelectric actuator 161, and promoting the second end 1612 of piezoelectric actuator 161 is one just
Voltage V+, and the micro voltage Vc that the first end 1611 of piezoelectric actuator 161 is exported corresponds to positive voltage V+ and is formed as a negative electricity
V- is pressed, or promoting the second end 1612 of piezoelectric actuator 161 is a negative voltage V-, and the first end 1611 of piezoelectric actuator 161
The micro voltage Vc exported is to correspond to negative voltage V- and be formed as a positive voltage V+.So as to piezoelectric actuator 161 is exported micro-
The variation of voltage Vc, it is required to control piezoelectric actuator 161 using frequency control circuit 12 and voltage switching module 13
Work oscillating circuit.
Frequency control circuit 12 is configured with frequency regulating circuit, voltage regulator circuit, bleeder circuit and one on control line road
Comparator 121.Wherein, frequency control circuit 12 is on control line road by first resistor R1 and first capacitor C1 is parallel with one another is matched
The frequency regulating circuit of composition is set, one end of frequency regulating circuit is electrically connected to the input terminal A of the frequency control circuit 12, receives
The second DC voltage Vd2 that voltage transformation module 11 is exported, the other end of frequency regulating circuit be electrically connected to comparator 121,
On the route of the receiving end C of frequency control circuit 12, and the receiving end C of frequency control circuit 12 is electrically connected piezoelectric actuator 161
First end 1611.It is configured and is constituted by second resistance R2 and 3rd resistor R3 on the control line road of frequency control circuit 12 again
One bleeder circuit, wherein second resistance R2 configuration constitute the first voltage route with first voltage V1, the first voltage line
Road one end electrical connection comparator 121, frequency control circuit 12 receiving end C route on, that is, frequency regulating circuit (i.e. by
The parallel circuit of first resistor R1 and first capacitor C1) be electrically connected with the receiving end C of frequency control circuit 12, with comparator 121
On the route of electrical connection, and 3rd resistor R3 configuration constitutes the second voltage route with second voltage V2, second voltage route
One end be electrically connected to the other end of first voltage route, the other end of second voltage route is electrically connected in the comparator 121,
And first voltage V1 and second voltage V2 are input in the comparator 121 by bleeder circuit.Frequency control circuit 12 is being controlled again
Also by the 4th resistance R4 and third capacitor the C3 voltage regulator circuit parallel with one another for configuring the input terminal A constituted, input on route processed
Hold one end of the voltage regulator circuit (i.e. by the parallel circuit of the 4th resistance R4 and third capacitor C3) of A and the second voltage of bleeder circuit
Route electrical connection, and the other end of the voltage regulator circuit of input terminal A is electrically connected with ground terminal G, is provided with stable voltage control modulus of conversion
The second DC voltage Vd2 that block 11 is inputted.
Comparator 121 has a positive input terminal, a negative input end and an output end, the positive input terminal electricity of comparator 121
The reception of rate of connections adjustment circuit (i.e. by the parallel circuit of first resistor R1 and first capacitor C1) and frequency control circuit 12
It holds on the route of A electrical connection and the positive input terminal of comparator 121 is electrically connected first voltage line receiver first voltage V-1, than
Negative input end compared with device 121 is electrically connected second voltage line receiver second voltage V2, and the output end of comparator 121 is electrically connected to frequency
The output end B of rate control circuit 12, and first voltage V-1 and second voltage V2 are separately input into comparator 121 by bleeder circuit
Positive input terminal and negative input end in, then be selected as according to comparison result by comparator 121 switching signal positive voltage V+ or
Negative voltage V- output, is wherein also connected to the first end 1611 of piezoelectric actuator 161 on the route of first voltage V-1, and receives
Micro voltage Vc.
Frequency control circuit 12 on control line road further on the second voltage route of second voltage V2 setting by
5th resistance R5 and the second capacitor C2 is parallel with one another to configure the voltage regulator circuit for constituting output end, and the voltage regulator circuit of output end is (i.e.
By the parallel circuit of the 5th resistance R5 and the second capacitor C2) one end be connected on second voltage route, and the pressure stabilizing of output end
The other end of circuit is electronically connected to the output end B of frequency control circuit 12, is exported to stable frequency control circuit 12
The switching signal positive voltage V+ or negative voltage V-.
In addition, the comparator 121 of frequency control circuit 12 is to be the first voltage V-1 and second voltage V2 that are inputted
Compare out, and output positive voltage V+ or negative voltage V- is selected according to comparison result.Also that is, when first voltage V1 is greater than second voltage
When V2, comparator 121 exports positive voltage V+, and when first voltage V1 is less than second voltage V2, comparator 121 exports negative voltage
V-。
The circuit structure of certain frequency control circuit 12 is not limited to this, however due in the drive system of general piezoelectric pump
Common frequency control circuit, therefore in this case only illustrates the circuit structure of one of frequency control circuit 12 with Fig. 1,
And other possible circuit state sample implementations are no longer described.
Voltage switching module 13 includes the 6th resistance R6, first switch Q1 and second switch Q2.Wherein the 6th resistance R6 is used
In the pressure stabilizing metering function of voltage switching module 13, one end is connected to the output end B of frequency control circuit 12, other end difference
It is connected in the second end 1612 of piezoelectric actuator 161.First switch Q1 and second switch Q2 has input terminal interconnected,
The input terminal interconnected is simultaneously electrically connected with the output end B of frequency control circuit 12, and first switch Q1 has interconnected
Output end, and be connected in the second end 1612 of piezoelectric actuator 161, and first switch Q1 has a control terminal, it is connected to frequency
The input terminal A of rate control circuit 12, the second DC voltage exported for receiving voltage transformation module 11, and second switch Q2 has
The output end having then is connected to ground terminal G, and such voltage switching module 13 constitutes a semibridge system transforming circuit.
Actuation between the drive module 12 and voltage switching module 13 of this case described further below.When piezoelectric pump 16
When to be started operation, frequency control circuit 12 receives the second DC voltage Vd2 that voltage transformation module 11 is exported, and by frequency
Bleeder circuit output partial pressure of the control circuit 12 on control line road generates first voltage V1 and second voltage V2, first voltage V1
And in second voltage V2 difference input comparator 121, comparator 121 just compares first voltage V1 and second voltage V2 and defeated at this time
Positive voltage V+ or negative voltage V- out.
When first voltage V1 is greater than second voltage V2, comparator 121 just exports positive voltage V+, such first switch Q1 quilt
Conducting running, second switch Q2 are then not turned on, and voltage switching module 13 exports positive voltage V+ to the second of piezoelectric actuator 161
On end 1612, at this time the first end 1611 of piezoelectric actuator 161 then will form slightly pressure drop negative voltage V- it is (that is, piezoelectric actuated
The conducting voltage of device 161 is negative voltage V-, is considered as negative voltage output for piezoelectric actuator 161), such negative voltage V- is passed
It is directed on the route of first voltage V1 of comparator 121, and is transformed into the input of the first voltage V1 of comparator 121, Ji Kezai
It exports the second voltage V2 that the second DC voltage Vd2 is divided with voltage transformation module 11 to compare, while because piezoelectric actuated
The negative voltage V- of conducting voltage on device 161 is able to adjust electricity using frequency the phenomenon that piezoelectric actuator 161 generates pressure difference
1611 institute of first end of automatic detection and adjustment piezoelectric actuator 161 is come on road with the parallel circuit of first resistor R1 and first capacitor C1
The resonance point working frequency of the micro voltage Vc of output, to adjust the working frequency for being suitble to piezoelectric actuator 161.
In this way, input of the negative voltage V- of slightly pressure drop as the first voltage V1 of comparator 121, when first voltage V1 is small
When second voltage V2, the output end of comparator 121 will export negative voltage V-, the second switch of such voltage switching module 13
Q2 is switched on running, and first switch Q1 is then not turned on, and 13 feedback of voltage switching module exports a negative voltage V- to piezoelectric actuated
In the second end 1612 of device 161, the first end 1611 of piezoelectric actuator 161 then will form the positive voltage V+ of slightly pressure drop at this time
(that is, the conducting voltage of piezoelectric actuator 161 is positive voltage V+, is considered as positive voltage output for piezoelectric actuator 161),
Such positive voltage V+ is conducted to the end first voltage V1 of comparator 121, and becomes the input of the first voltage V1 of comparator 121,
Again with convert the voltage into the second voltage V2 that the second DC voltage Vd2 that module 11 is exported is divided and compare, so recycle
Under, frequency control circuit 12 and voltage switching module 13 are formed can be in response to the micro voltage Vc's that piezoelectric actuator 161 is exported
The work oscillating circuit of generating positive and negative voltage variation, allows piezoelectric actuator 161 to convert electric energy to mechanical energy, and corresponds to driving piezoelectricity and cause
Dynamic 16 running of pump.The working frequency of certain piezoelectric actuator 161 also because in frequency control circuit 12 frequency regulating circuit with first
The parallel circuit design of resistance R1 and first capacitor C1 carry out automatic detection and adjustment, and frequency is adjusted to needed for piezoelectric actuator 161
Working frequency, can make whereby piezoelectric actuator 161 work on best operating point.
Referring again to Fig. 1, division module 15 includes the 7th resistance R7, the 8th resistance R8 and the 9th resistance R9.7th resistance
One end of R7 is electrically connected with microcontroller 142 and receives adjustment signal.One end of 8th resistance R8 is another with the 7th resistance R7's
End electrical connection, the other end of the 8th resistance R8 are electrically connected with voltage transformation module 11.One end of 9th resistance R9 and the 8th resistance
The other end and voltage transformation module 11 of R8 is electrically connected, and the other end of the 9th resistance R9 is electrically connected with ground terminal G.
In one embodiment, microcontroller 142 exported with non-return control mode control voltage transformation module 11 the
Two DC voltages, that is, the voltage value for working as the adjustment signal that microcontroller 142 is exported is higher, then 11 institute of voltage transformation module is defeated
The voltage value of the second DC voltage out is higher.Certainly, in other embodiments, microcontroller 142 can change with Reverse Turning Control side
The second DC voltage Vd2 that formula control voltage transformation module 11 is exported, that is, work as the adjustment signal that microcontroller 142 is exported
Voltage value it is lower, the voltage value for the second DC voltage Vd2 that voltage transformation module 11 is exported is higher.
Referring again to Fig. 1, in some embodiments, voltage transformation module 11 has more a mode selector switch 110, works as mould
When formula switches switch 110 and is connected, voltage transformation module 11 executes a normal mode, i.e., voltage transformation module 11 by received the
One DC voltage Vd1 is converted to the second DC voltage Vd2, and when mode selector switch 110 ends, voltage transformation module 11 is then
A stop mode is executed, i.e. voltage transformation module 11 stops the second DC voltage Vd2 of adjustment or directly stops operating.In addition, right
It should include mode selector switch 110 in voltage transformation module 11, microcontroller 142 more exports a mode switching signal, wherein micro-
Controller 142 only receive a control command or judge actual pressure variable quantity be equal to preset pressure variable quantity when, it is micro-
Controller 142 ends by mode switching signal control mode switch switch 110, executes voltage transformation module 11 and stops mould
Formula, otherwise remaining situation, microcontroller 142 by mode switching signal and control mode switch switch 110 is connected.
Referring to Fig. 2, it is the exemplary plot of actual pressure variable quantity and preset pressure variable quantity.As shown in Fig. 2,
Microcontroller 142 can detect the pneumatic flow in piezoelectric pump 16 by baroceptor 141, export a pneumatic flow detected value,
And a time section is learnt from pneumatic flow detected value, such as t0 to t1 and t1 is to the actual pressure variable quantity of t2 time section,
And actual pressure variable quantity and preset pressure variable quantity are compared, wherein when actual pressure variable quantity is greater than preset pressure variable quantity,
Such as time section be t0~t1 when, microcontroller 142 exports corresponding feedback signal and controls voltage transformation module 11 and downgrade
Second DC voltage, so that actual pressure variable quantity levels off to preset pressure variable quantity.Conversely, when actual pressure variable quantity is less than
Preset pressure variable quantity, for example, time section be t1~t2 when, microcontroller 142 exports corresponding feedback signal and controls voltage
Conversion module 11 increases the second DC voltage, so that actual pressure variable quantity levels off to preset pressure variable quantity.
In conclusion this case provides a kind of drive system of piezoelectric pump, wherein drive system can be by frequency control circuit
The optimum resonance working frequency of piezoelectric actuator is found in the way of circuit concussion, therefore drive system can be according to piezoelectric actuator
Characteristic is different and working frequency needed for being automatically adjusted to piezoelectric actuator, therefore the working frequency of piezoelectric actuators be that can be changed.
In addition, the microcontroller of the drive system of this case can be adjusted to the difference with preset pressure variable quantity according to actual pressure variable quantity
The corresponding control voltage transformation module of value adjusts output voltage, adjusts the pneumatic flow in piezoelectric pump whereby, changes actual pressure
Amount is adjusted to consistent with preset pressure variable quantity, therefore the actually exportable variable voltage of the drive system of this case is to piezoelectric actuated
Device, while the working frequency for controlling piezoelectric actuator is variable, therefore the drive system of this case can reach effective accurate control
It the performance of piezoelectric pump and exports flow velocity, avoid the damage of piezoelectric pump and the preferable effect of applicability.
This case as the personage Ren Shi craftsman for being familiar with this technology thinks and be it is all as modify, it is so neither de- such as attached claim
Be intended to Protector.
Claims (14)
1. a kind of drive system, to drive the piezoelectric actuator with a first end and a second end in a piezoelectric pump,
Include:
One voltage transformation module, one first DC voltage is converted to one second DC voltage；
One frequency control circuit is electrically connected to the voltage transformation module and the piezoelectric actuator, seeks to be shaken using circuit
A resonance working frequency of the piezoelectric actuator is looked for, and corresponds to one switching signal of output according to the resonance working frequency；
One voltage switching module, is electrically connected to the frequency control circuit, to according to the switching signal and by second direct current
Pressure is converted to an alternating voltage, to be applied to piezoelectric actuator driving running；
One division module is electrically connected to the voltage transformation module；And
One detection module includes a baroceptor and a microcontroller, which is connected to the piezoelectric pump, to examine
Survey the pneumatic flow in the piezoelectric pump, and according to testing result one pneumatic flow detected value of corresponding output, the microcontroller with should
Baroceptor and division module electrical connection learn that an actual pressure of a time section becomes by the pneumatic flow detected value
Change amount, and the actual pressure variable quantity and a preset pressure variable quantity are compared, it is passed with exporting an adjustment signal according to comparison result
It send to the voltage transformation module, the voltage transformation module is made to adjust second DC voltage according to the adjustment signal, it should with adjustment
Pneumatic flow in piezoelectric pump makes the actual pressure variable quantity level off to the preset pressure variable quantity.
2. drive system as described in claim 1, which is characterized in that the voltage for the adjustment signal that the microcontroller is exported
Value is higher, and the voltage value for second DC voltage which is exported is higher.
3. drive system as described in claim 1, which is characterized in that the voltage for the adjustment signal that the microcontroller is exported
Value is lower, and the voltage value for second DC voltage which is exported is higher.
4. drive system as described in claim 1, which is characterized in that the adjustment signal is pulse width modulation signal.
5. drive system as described in claim 1, which is characterized in that when the actual pressure variable quantity becomes greater than the preset pressure
When change amount, the corresponding adjustment signal of microcontroller output controls the voltage transformation module and downgrades second DC voltage, when
When the actual pressure variable quantity is less than the preset pressure variable quantity, which exports the corresponding adjustment signal and controls the electricity
Pressure conversion module increases second DC voltage.
6. drive system as described in claim 1, which is characterized in that the voltage transformation module further includes a pattern switching and opens
It closes, controls the voltage transformation module and stop adjusting second DC voltage or stop operating.
7. drive system as described in claim 1, which is characterized in that there is the frequency control circuit input terminal, one to receive
End, an output end and a control route, the input terminal receive the second DC voltage of the voltage transformation module, which is electrically connected
It is connected to voltage switching module, which is electrically connected to the first end of piezoelectric actuator, and receives the piezoelectric actuator and exported
Micro voltage, the control route be connected electrically on the input terminal configured with a frequency regulating circuit, a voltage regulator circuit, one partial pressure electricity
Road and a comparator, the frequency regulating circuit one end are electrically connected the input terminal, which is electrically connected to
On the bleeder circuit, and the bleeder circuit one end is electrically connected to the receiving end, and the other end electrical connection of the bleeder circuit is divided into
First voltage route and second voltage circuit output are into the comparator.
8. drive system as claimed in claim 7, which is characterized in that the control line of frequency control circuit road is by one the
One resistance and first capacitor configuration parallel with one another constitute the frequency regulating circuit, and one end connection of the frequency regulating circuit should
The input terminal of frequency control circuit, the other end of the frequency regulating circuit is electrically connected in the comparator, the receiving end and should
On bleeder circuit.
9. drive system as claimed in claim 7, which is characterized in that this point of the control line road of the frequency control circuit
Volt circuit is configured and is constituted by a second resistance and a 3rd resistor, and wherein second resistance configuration, which is constituted, has first voltage
The first voltage route, one end of the first voltage route are electrically connected the frequency regulating circuit and are electrically connected and are somebody's turn to do with the receiving end
On the route of comparator electrical connection, and 3rd resistor configuration constitutes the second voltage route with second voltage, this second
One end of voltage circuit is electrically connected to the other end of the first voltage route, and the other end of the second voltage route is electrically connected to this
In comparator, and the first voltage and the second voltage are input in the comparator by the bleeder circuit.
10. drive system as claimed in claim 7, which is characterized in that the control line road of the frequency control circuit is by one
4th resistance and the third capacitor voltage regulator circuit parallel with one another for configuring composition input terminal, voltage regulator circuit one end of the input terminal
It is electrically connected on the second voltage route of the bleeder circuit, this for being provided with that the stability contorting voltage transformation module inputted is second straight
Galvanic electricity pressure.
11. drive system as claimed in claim 9, which is characterized in that the comparator has a positive input terminal, a negative input end
And an output end, the positive input terminal of the comparator are electrically connected the route that the frequency regulating circuit is electrically connected with the receiving end
On, the positive input terminal of the comparator is electrically connected the first voltage line receiver first voltage, the negative input of the comparator
The end electrical connection second voltage line receiver second voltage, the output end of the comparator are electrically connected to the frequency control circuit
Output end, which compares the second voltage of the first voltage of the positive input terminal and the negative input end, and exports
A positive voltage or a negative voltage for the switching signal, the positive voltage or the negative voltage are transferred to the piezoelectric actuator and form correspondence
The positive voltage or the negative voltage, and conduct to the positive input terminal, and the comparator is by positive voltage of the positive input terminal or should
This of negative voltage and the negative input end second voltage compare and export positive voltage or the negative voltage for the switching signal, borrow
With the variation for the micro voltage that the first end and the second end of the piezoelectric actuator are exported, to utilize the frequency control circuit
And the voltage switching module controls the required work oscillating circuit of the piezoelectric actuator, and simultaneously with the frequency control circuit
The frequency regulating circuit automatic detection and adjustment piezoelectric actuator the first end and the micro voltage that is exported of the second end
Variation and adjust required working frequency.
12. drive system as claimed in claim 11, which is characterized in that the control line road of the frequency control circuit is by one
5th resistance and one second capacitor parallel circuit configure constitute output end voltage regulator circuit, the one of the voltage regulator circuit of the output end
End is electrically connected on the second voltage route of the bleeder circuit, and the other end of the voltage regulator circuit of the output end is electrically connected to the frequency
The output end of control circuit, the positive voltage for the switching signal that the output end to stablize the frequency control circuit is exported or
The negative voltage.
13. drive system as described in claim 1, which is characterized in that the voltage switching module is electrically connected to frequency control
The output end of circuit is electrically connected to this comprising a first switch, a second switch and one the 6th resistance, one end of the 6th resistance
The output end of frequency control circuit, the other end of the 6th resistance are electrically connected to the second end of the piezoelectric actuator, and this
One switch and the second switch have input terminal interconnected, the input terminal interconnected and with the frequency control circuit
Output end electrical connection, the first switch and the second switch have an output end interconnected, the output end and with the piezoelectricity
The second end of actuator is electrically connected, and the first switch has a control terminal, which is electrically connected to frequency control electricity
The input terminal on road, second DC voltage exported for receiving the voltage transformation module, and the second switch has a control
End is then electrically connected with a ground terminal.
14. drive system as described in claim 1, which is characterized in that the division module includes:
One end of one the 7th resistance, the 7th resistance is electrically connected with the microcontroller and receives the adjustment signal；
One the 8th resistance, one end of the 8th resistance is electrically connected with the other end of the 7th resistance, the other end of the 8th resistance
It is electrically connected with the voltage transformation module；And
One the 9th resistance, one end of the 9th resistance are electrically connected with the other end of the 8th resistance, the other end of the 9th resistance
It is electrically connected with a ground terminal.
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| CN201610891780.2A CN107939658B (en) | 2016-10-13 | 2016-10-13 | The drive system of piezoelectric pump |
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| CN201610891780.2A CN107939658B (en) | 2016-10-13 | 2016-10-13 | The drive system of piezoelectric pump |
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| CN107939658B true CN107939658B (en) | 2019-11-05 |
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| CN111536024B (en) * | 2018-09-12 | 2022-04-05 | 国网江苏省电力有限公司泰州供电分公司 | Multistage high-frequency piezoelectric pump control system |
| CN111779659B (en) * | 2019-04-03 | 2022-11-18 | 研能科技股份有限公司 | Miniature piezoelectric pump module |
| CN113556022B (en) * | 2020-04-24 | 2023-03-24 | 研能科技股份有限公司 | Drive circuit system for driving piezoelectric pump |
| CN113669239B (en) * | 2020-05-14 | 2023-05-09 | 研能科技股份有限公司 | Method for reinforcing thin pump |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH01174278A (en) * | 1987-12-28 | 1989-07-10 | Misuzu Erii:Kk | Inverter |
| US7312554B2 (en) * | 2004-04-02 | 2007-12-25 | Adaptivenergy, Llc | Piezoelectric devices and methods and circuits for driving same |
| CN102983772A (en) * | 2011-09-05 | 2013-03-20 | 研能科技股份有限公司 | Drive circuit and applicative piezoelectric actuating pump thereof |
| US8958217B2 (en) * | 2012-06-15 | 2015-02-17 | General Electric Company | System for driving a piezoelectric load and method of making same |
| CN104283451B (en) * | 2013-07-05 | 2018-05-15 | 研能科技股份有限公司 | Polarity switching circuit |
| CN205283427U (en) * | 2015-12-31 | 2016-06-01 | 研能科技股份有限公司 | Drive circuit and applicative piezoelectric actuating pump thereof |
| CN206419195U (en) * | 2016-10-13 | 2017-08-18 | 研能科技股份有限公司 | Drive system |
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