阅读说明：本技术 微型压电泵模块 (Miniature piezoelectric pump module ) 是由 莫皓然 陈圣文 陈世昌 黄启峰 韩永隆 李伟铭 郭俊毅 于 2019-04-03 设计创作，主要内容包括：一种微型压电泵模块,包含：微处理器,输出调变信号及控制信号；驱动组件,电连接微处理器,以接收调变信号与控制信号,并输出驱动信号,驱动信号包含驱动电压及驱动频率；以及压电泵,电连接驱动组件,以接收驱动信号,并依驱动信号作动,压电泵设有作动频率及作动电压值；其中,微处理器驱使驱动组件输出具有起始电压值的驱动电压至压电泵,并于驱使驱动组件输出具有起始电压值的驱动电压时,输出驱动频率使其逐步趋近于压电泵的作动频率,驱动组件输出的驱动频率调整至作动频率后,驱使驱动组件的驱动电压的电压值提升至作动电压值。(A miniature piezoelectric pump module, comprising: a microprocessor for outputting a modulation signal and a control signal; the driving component is electrically connected with the microprocessor to receive the modulation signal and the control signal and output a driving signal, and the driving signal comprises a driving voltage and a driving frequency; the piezoelectric pump is electrically connected with the driving component to receive the driving signal and acts according to the driving signal, and is provided with an actuating frequency and an actuating voltage value; the microprocessor drives the driving component to output a driving voltage with an initial voltage value to the piezoelectric pump, and when the driving component is driven to output the driving voltage with the initial voltage value, the driving frequency is output to gradually approach the actuating frequency of the piezoelectric pump, and after the driving frequency output by the driving component is adjusted to the actuating frequency, the voltage value of the driving voltage of the driving component is driven to be increased to the actuating voltage value.)

1. A miniature piezoelectric pump module, comprising:

a microprocessor for outputting a modulation signal and a control signal;

a driving component electrically connected to the microprocessor for receiving the modulation signal and the control signal and outputting a driving signal, wherein the driving signal comprises a driving voltage and a driving frequency; and

a piezoelectric pump electrically connected to the driving component for receiving the driving signal and acting according to the driving signal, the piezoelectric pump having an action frequency and an action voltage value;

the microprocessor receives a start signal to drive the driving component to output the driving voltage with an initial voltage value to the piezoelectric pump, and when the driving component is driven to output the driving voltage with the initial voltage value, the driving frequency is output to gradually approach the actuating frequency of the piezoelectric pump, and after the driving frequency output by the driving component is adjusted to the actuating frequency, the microprocessor drives the voltage value of the driving voltage output by the driving component to be gradually increased from the initial voltage value to the actuating voltage value.

2. A miniature piezoelectric pump module as claimed in claim 1, wherein the microprocessor drives the driving element to gradually decrease the driving voltage outputted from the driving element from the actuation voltage value to a shutdown voltage value after receiving a shutdown signal, and stops the driving element when the driving voltage of the driving element decreases to the shutdown voltage value.

3. A miniature piezoelectric pump module as defined in claim 2, wherein the turn-off voltage is the initial voltage.

4. A miniature piezoelectric pump module as defined in claim 3, wherein the threshold voltage is 3 to 7V.

5. A miniature piezoelectric pump module as defined in claim 2, wherein the microprocessor obtains a front-end frequency and a rear-end frequency by spacing a frequency segment before and after the central frequency as a reference according to the operating frequency as a central frequency, and the microprocessor calculates a preferred operating frequency by a frequency tracking signal of the front-end frequency, the central frequency and the rear-end frequency transmitted back to the driving component by the piezoelectric pump, and drives the driving frequency output by the driving component to approach the preferred operating frequency.

6. A miniature piezoelectric pump module as defined in claim 5, wherein the microprocessor uses the preferred operating frequency as the center frequency, and the front-end frequency and the rear-end frequency are obtained by spacing the frequency segments in front of and behind the center frequency as a reference, and the microprocessor calculates the preferred operating frequency by the frequency following signals of the front-end frequency, the center frequency and the rear-end frequency transmitted back to the driving assembly by the piezoelectric pump, and drives the driving frequency output by the driving assembly to approach the preferred operating frequency.

7. A miniature piezoelectric pump module as claimed in claim 5 or claim 6, wherein a measurement chip is disposed between the piezoelectric pump and the microprocessor, and the frequency tracking signal is transmitted from the piezoelectric pump to the microprocessor via the measurement chip.

8. A miniature piezoelectric pump module as claimed in claim 7, wherein the frequency tracking signal is an impedance value.

9. A miniature piezoelectric pump module as defined in claim 2, wherein the driving assembly comprises:

a voltage transformer for receiving the modulation signal and outputting the driving voltage to the piezoelectric pump; and

and the inverter receives the control signal and outputs the driving frequency to control the piezoelectric pump by the control signal.

10. A miniature piezoelectric pump module as defined in claim 2, further comprising a feedback circuit electrically connected between the piezoelectric pump and the microprocessor, wherein the feedback circuit generates a feedback voltage from the driving voltage output from the driving element to the piezoelectric pump and feeds the feedback voltage back to the microprocessor, and the microprocessor adjusts the driving signal according to the feedback voltage to make the voltage value of the driving voltage output from the driving element gradually approach the actuation voltage value until the voltage value of the driving voltage output from the driving element to the piezoelectric pump is the same as the actuation voltage value.

11. A miniature piezoelectric pump module as defined in claim 1, wherein the driving element comprises a digital variable resistor, and the driving element adjusts the voltage level of the driving voltage by adjusting the digital variable resistor.

12. A miniature piezoelectric pump module as defined in claim 1, wherein the actuation voltage is 12 to 20V.

Technical Field

The present invention relates to a micro piezoelectric pump module, and more particularly, to a micro piezoelectric pump module capable of reducing noise during power on/off operation and maintaining a good transmission efficiency.

Background

At present, no product in each industry is developed towards miniaturization, and the micropump is the key of the fluid transmission device, so that how to achieve the purposes of small volume, silence and good fluid transmission effect is an important proposition in the current science and technology industry; fig. 1A and 1B show a conventional micro piezoelectric pump structure, in which a driving voltage is applied to a piezoelectric element 201 of a micro piezoelectric pump 200, so that the piezoelectric element 201 is deformed due to a piezoelectric effect to drive a vibration plate 202 and a resonance plate 203 to move up and down, and the vibration plate 202 and the resonance plate 203 compress and expand the volume of an internal chamber of the piezoelectric pump 200 when moving up and down, so as to change the pressure inside the piezoelectric pump 200 to achieve the effect of fluid transmission.

The present miniature piezoelectric pump has been widely used in various fields, such as blood pressure meters and blood sugar meters for medical use, or air detection devices for detecting air quality, and has been used as an important element for conveying fluid.

However, the micro piezoelectric pump is mainly used intermittently in the aforementioned applications, such as a sphygmomanometer and a blood glucose monitor, which are not operated continuously, but the conventional micro piezoelectric pump generates a short noise when being turned on or off, and particularly when being applied to an air detection device, if the air detection device is set to perform a gas sampling operation every 10 minutes, the micro piezoelectric pump generates two noises when being turned on or off every 10 minutes, and as the sampling time is shortened, the sampling frequency is increased, the noise generated when the micro piezoelectric pump is turned on or off interferes with daily life, and particularly when the micro piezoelectric pump falls asleep at night, the sleep quality of a user is seriously affected by frequent noises.

Disclosure of Invention

The main purpose of the scheme is to provide a miniature piezoelectric pump module, which can effectively reduce the noise of starting and stopping the miniature piezoelectric pump.

To achieve the above object, a micro piezoelectric pump module according to a broader aspect of the present invention includes: a microprocessor for outputting a modulation signal and a control signal; a driving component electrically connected to the microprocessor for receiving the modulation signal and the control signal and outputting a driving signal, wherein the driving signal comprises a driving voltage and a driving frequency; and a piezoelectric pump electrically connected with the driving component to receive the driving signal and act according to the driving signal, wherein the piezoelectric pump is provided with an actuating frequency and an actuating voltage value; the microprocessor receives a start signal to drive the driving component to output the driving voltage with an initial voltage value to the piezoelectric pump, and when the driving component is driven to output the driving voltage with the initial voltage value, the driving frequency is output to gradually approach the actuating frequency of the piezoelectric pump, and after the driving frequency output by the driving component is adjusted to the actuating frequency, the microprocessor drives the voltage value of the driving voltage output by the driving component to be gradually increased from the initial voltage value to the actuating voltage value.

Drawings

Fig. 1A and 1B are schematic cross-sectional views of a conventional micro piezoelectric pump.

Fig. 2 is a block diagram of the micro piezoelectric pump module according to the present disclosure.

Fig. 3 is a schematic circuit diagram of the present miniature piezoelectric pump module.

Fig. 4A is an equivalent circuit diagram of the feedback circuit in the first control step.

Fig. 4B is an equivalent circuit diagram of the feedback circuit in the second control step.

Description of the reference numerals

100: miniature piezoelectric pump module

1: microprocessor

11: control unit

12: conversion unit

13: communication unit

2: drive assembly

21: pressure changing piece

211: voltage output terminal

212: voltage transformation feedback terminal

213: voltage transformation feedback circuit

213 a: first end point

213 b: second end point

213 c: third endpoint

213 d: fourth terminal point

213 e: communication interface

22: inversion component

221: buffer brake

221 a: buffer input terminal

221 b: buffer output

222: inverter with a capacitor having a capacitor element

222 a: inverting input terminal

222 b: inverting output terminal

223: a first P-type metal oxide semiconductor field effect transistor

224: second P-type metal oxide semiconductor field effect transistor

225: a first N-type metal oxide semiconductor field effect transistor

226: second N-type metal oxide semiconductor field effect transistor

3: piezoelectric pump

31: a first electrode

32: second electrode

33: piezoelectric element

4: feedback circuit

41 a: first contact

41 b: second contact

42 a: third contact

42 b: fourth contact

43 a: fifth contact

43 b: the sixth contact

44 a: seventh junction

44 b: eighth contact

5: switch unit

6: measuring chip

C: capacitor with a capacitor element

D: drain electrode

G: grid electrode

S: source electrode

R1: a first resistor

R2: second resistance

R3: third resistance

R4: fourth resistor

R5: fifth resistor

200: piezoelectric pump

201: piezoelectric element

202: vibrating plate

203: resonance sheet

Detailed Description

Embodiments that embody the features and advantages of this disclosure will be described in detail in the description that follows. It will be understood that the present disclosure is capable of various modifications without departing from the scope of the disclosure, and that the description and drawings are to be regarded as illustrative in nature, and not as restrictive.

Referring to fig. 2, fig. 2 is a block diagram of the present miniature piezoelectric pump module. The miniature piezoelectric pump module 100 comprises: the driving device comprises a microprocessor 1, a driving component 2 and a piezoelectric pump 3, wherein the microprocessor 1 is used for outputting a modulation signal and a control signal, the driving component 2 is electrically connected with the microprocessor 1, receives the modulation signal and the control signal, and outputs a driving signal by the modulation signal and the control signal, the driving signal comprises a driving voltage and a driving frequency, and drives the driving component 2 to convert a certain voltage into the driving signal, in the present case, the driving signal is a square wave alternating current (so including the driving voltage and the driving frequency), but not limited thereto, the driving signal can be a sine wave or a triangular wave; the driving component 2 adjusts the driving voltage according to the modulation signal of the microprocessor 1, and adjusts the driving frequency according to the control signal, so as to drive the piezoelectric pump 3 to act; the piezoelectric pump 3 is electrically connected to the driving component 2, receives the driving signal transmitted by the driving component 2, and operates according to the driving signal, in addition, the piezoelectric pump 3 has an operating frequency and an operating voltage value, when the driving frequency received by the piezoelectric pump 3 reaches the operating frequency, the piezoelectric pump 3 will start, and the operating voltage value is the ideal working voltage of the piezoelectric pump 3, when the voltage value of the driving voltage received by the piezoelectric pump 3 is consistent with the operating voltage value, the piezoelectric pump has better transmission efficiency.

The microprocessor 1 is connected with a switch unit 5 to receive an opening signal and a closing signal sent by the switch unit 5; when the microprocessor 1 receives the start signal of the switch unit 5, the microprocessor 1 outputs a modulation signal to the driving component 2 to drive the driving component 2 to adjust the constant voltage to an initial voltage value, so as to output a driving voltage with the initial voltage value to the piezoelectric pump 3, and output a driving frequency to the piezoelectric pump 3, the microprocessor 1 adjusts the driving frequency output by the driving component 2 by adjusting the control signal, so that the driving frequency is continuously close to the actuation frequency of the piezoelectric pump 3 under the condition that the driving component 2 outputs the driving voltage with the initial voltage value to the piezoelectric pump 3, when the driving frequency output by the driving component 2 is consistent with the actuation frequency, the piezoelectric pump 3 immediately starts to actuate, and the microprocessor 1 adjusts the voltage value of the driving voltage of the driving component 2 again by the modulation signal, so as to drive the voltage value of the driving voltage output by the driving component 2 to gradually increase from the initial voltage value to the actuation voltage value, the opening operation of the piezoelectric pump 3 can be completed.

As mentioned above, after the microprocessor 1 receives the shutdown signal, the microprocessor 1 outputs the modulation signal to the driving component 2 to drive the driving component 2 to gradually decrease the voltage value of the driving voltage output to the piezoelectric pump 3 from the actuation voltage value to a shutdown voltage value, and when the voltage value of the driving voltage decreases to the shutdown voltage value, the microprocessor 1 stops outputting the modulation signal and the control signal to the driving component 2 to stop the operation of the driving component 2 and also stop the actuation of the piezoelectric pump 3; in addition, the turn-off voltage value may be the same as the start voltage value, but not limited thereto.

Referring to fig. 3, fig. 3 is a circuit structure diagram of the present miniature piezoelectric pump module, the microprocessor 1 has a control unit 11, a transforming unit 12 and a communication unit 13, the driving assembly 2 has a voltage transforming member 21, an inverting member 22, the piezoelectric pump 3 has a first electrode 31, a second electrode 32 and a piezoelectric element 33, the communication unit 13 is electrically connected to the voltage transforming member 21, so as to output a modulation signal to the voltage transformation element 21, the voltage transformation element 21 transforms a certain voltage to a required driving voltage according to the modulation signal, and transmits the driving voltage to the piezoelectric pump 3, the control unit 11 is electrically connected to the inverter 22, and controls the driving voltage or the grounding frequency received by the first electrode 31 and the second electrode 32 of the piezoelectric pump 3 through the driving frequency output by the inverter 22, to further control the switching speed of the piezoelectric element 33 receiving the driving voltage and the deformation of the driving signal due to the piezoelectric effect.

The voltage transformer 21 further includes a voltage output terminal 211, a voltage transformation feedback terminal 212 and a voltage transformation feedback circuit 213, the voltage output terminal 211 is electrically connected to the inverter 22, the voltage transformation feedback circuit 213 is electrically connected between the microprocessor 1 and the voltage transformation feedback terminal 212, wherein the voltage transformation feedback circuit 213 includes a fourth resistor R4 and a fifth resistor R5, the fourth resistor R4 has a first end 213a and a second end 213b, the fifth resistor R5 has a third end 213c and a fourth end 213d, the first end 213a of the fourth resistor R4 is electrically connected to the voltage output terminal 211, the third end 213c of the fifth resistor R5 is electrically connected to the second end 213b of the fourth resistor R4 and the voltage transformation feedback terminal 212, and the fourth end 213d of the fifth resistor R5 is grounded. The fifth resistor R5 is a variable resistor, and in the present embodiment, the fifth resistor R5 is a digital variable resistor; the transformer feedback circuit 213 has a communication interface 213e, the communication interface 213e is electrically connected to the communication unit 13 of the microprocessor 1, so that the communication unit 13 can transmit the modulation signal to the digital variable resistor (the fifth resistor R5) to adjust the resistance thereof, in addition, the driving voltage output by the voltage output end 211 of the transformer 21 is also divided by the fourth resistor R4 and the fifth resistor R5 of the transformer feedback circuit 213, the divided driving voltage is transmitted back to the transformer 21 from the transformer feedback end 212, so as to determine whether the driving voltage output by the transformer 21 with reference to the voltage output meets the driving voltage expected by the modulation signal of the microprocessor 1, if there is a difference, the output driving voltage is modulated again so as to be continuously adjusted to approach the driving voltage expected by the modulation signal of the microprocessor 1 and be consistent with the driving voltage.

The inverter 22 includes: a buffer gate 221, an inverter 222, a first P-type mosfet 223, a second P-type mosfet 224, a first N-type mosfet 225, and a second N-type mosfet 226; the buffer gate 221 has a buffer input 221a and a buffer output 221b, the inverter 222 has an inverting input 222a and an inverting output 222b, and the first P-type mosfet 223, the second P-type mosfet 224, the first N-type mosfet 225 and the second N-type mosfet 226 each have a gate G, a drain D and a source S, respectively; wherein, the buffer input end 221a of the buffer gate 221 and the inverting input end 222a of the inverter 222 are electrically connected to the control unit 11 of the microprocessor 1 for receiving the control signal, the buffer output end 221b of the buffer gate 221 is electrically connected to the gate G of the first P-type mosfet 223 and the gate G of the first N-type mosfet 225, the inverting output end 222b of the inverter 222 is electrically connected to the gate G of the second P-type mosfet 224 and the gate G of the second N-type mosfet 226, the source S of the first P-type mosfet 223 and the source S of the second P-type mosfet 224 are electrically connected to the voltage output end 211 of the voltage transformer 21 for receiving the driving voltage output by the voltage transformer 21, the drain D of the first P-type mosfet 223 is electrically connected to the drain D of the first N-type mosfet 225 and the second electrode 32 of the pump 3, the drain D of the second P-type mosfet 224 is electrically connected to the source S of the second N-type mosfet 226 and the first electrode 31 of the piezoelectric pump 3, and the source S of the first N-type mosfet 225 is electrically connected to the source S of the second N-type mosfet 226 and grounded.

The first P-type mosfet 223, the second P-type mosfet 224, the first N-type mosfet 225 and the second N-type mosfet 226 form an H-bridge structure for converting the driving voltage (dc) output from the voltage transformer 21 into ac power and supplying the driving signal to the piezoelectric pump 3 as ac power having the driving voltage and the driving frequency, so that the first P-type mosfet 223 and the second P-type mosfet 224 need to receive opposite signals, the first N-type mosfet 225 and the second N-type mosfet 226 also have the same structure, and therefore the control signal transmitted by the microprocessor 1 is transmitted to the second P-type mosfet 224 through the inverter 222 before passing through the inverter 222, so that the control signal of the second P-type mosfet 224 and the first P-type mosfet 223 are in opposite phases, however, the first P-type mosfet 223 and the second P-type mosfet 224 must be connected to the control signal together, so a buffer gate 221 is provided in front of the first P-type mosfet 223 to allow the first P-type mosfet 223 and the second P-type mosfet 224 to be connected to the opposite signals synchronously, as well as the first N-type mosfet 225 and the second N-type mosfet 226; in the first control step, when the first P-type mosfet 223 and the second N-type mosfet 226 are turned on and the second P-type mosfet 224 and the first N-type mosfet 225 are turned off, the driving voltage is transmitted to the second electrode 32 of the piezoelectric pump 3 through the first P-type mosfet 223, and the first electrode 31 of the piezoelectric pump 3 is grounded due to the second N-type mosfet 226 being turned on; in the second control step, when the first P-type mosfet 223 and the second N-type mosfet 226 are turned off and the second P-type mosfet 224 and the first N-type mosfet 225 are turned on, the driving voltage is transmitted to the first electrode 31 of the piezoelectric pump 3 through the second P-type mosfet 224, and the second electrode 32 of the piezoelectric pump 3 is grounded due to the turn-on of the first N-type mosfet 225; by repeating the above first step and the second step, the piezoelectric element 33 of the piezoelectric pump 3 can be deformed by the piezoelectric effect due to the driving voltage and the grounding received by the first electrode 31 and the second electrode 32 in turn, and the direction of deformation of the piezoelectric element 33 is changed by the driving frequency, so as to change the volume of a chamber (not shown) inside the piezoelectric pump 3, so that the pressure of the chamber is changed, and the fluid is continuously pushed to achieve the effect of transmitting the fluid.

With reference to fig. 2, it is clear from the above description how the microprocessor 1 controls the driving component 2 to output the driving voltage and the driving frequency to the piezoelectric pump3, however, when the driving frequency of the piezoelectric pump 3 is changed along with the operation of the piezoelectric pump 3, since the shape of the piezoelectric element 33 is rapidly and frequently changed by the piezoelectric effect at a high frequency, thermal energy is generated, and the thermal energy affects the driving frequency of the piezoelectric element 33 during operation, thereby reducing the efficiency; therefore, a feedback circuit 4 and a measurement chip 6 are disposed between the microprocessor 1 and the piezoelectric pump 3, so that the micro piezoelectric pump module 100 will start to perform frequency following operation to maintain a better driving frequency, and the microprocessor 1 will start to use the operating frequency of the piezoelectric pump 3 as a center frequency f_cAt a center frequency f_cObtaining a front-end frequency f by spacing a frequency bin before and after the reference_fAnd a back-end frequency f_bAnd a frequency tracking signal is returned from the measurement chip 6, the frequency tracking signal includes a center frequency f_cFront section frequency f_fAnd a back-end frequency f_bIs measured by the microprocessor 1 from the center frequency f based on the measured value in the frequency tracking signal_cFront section frequency f_fAnd a back-end frequency f_bExtracting a preferred operating frequency f_gAnd drive the driving frequency outputted by the driving component 2 to gradually approach the preferred actuating frequency f_gSo that the driving frequency and the preferred operating frequency f of the piezoelectric pump 3 are supplied by the driving component 2_gConsistency, avoiding reduction of transmission efficiency; the frequency tracking signal may be an impedance value, but not limited thereto, the measuring chip 6 measures the current and voltage of the piezoelectric pump 3, and obtains the impedance value of the piezoelectric pump 3 during operation according to the measurement result, and then the center frequency f is calculated_cFront section frequency f_fAnd a back-end frequency f_bThe impedance value of (f) is transmitted back to the microprocessor 1 as a frequency tracking signal, and the microprocessor 1 transmits the central frequency f_cFront section frequency f_fAnd a back-end frequency f_bThe frequency with the lowest impedance value among the three is used as the better operating frequency f_gThe driving frequency of the driving component 2 is adjusted to the preferred operating frequency f_gAnd (5) the consistency is achieved.

The optimum driving frequency f cannot be maintained due to the thermal energy generated by the continuous operation of the piezoelectric pump 3_gTherefore, the frequency tracking action should be continued, and the frequency tracking action of the new round will be compared with the aboveOptimum operating frequency f_gAs new center frequency f_c2Likewise at the new center frequency f_c2Obtaining a new front-end frequency f by spacing a frequency bin before and after the reference_f2And a new back-end frequency f_b2Then, a new center frequency f is selected according to the frequency tracking signal_c2Front section frequency f_f2Rear section frequency f_c2The lowest impedance value of the three is used as the new better actuating frequency f_g2Then, the microprocessor 1 drives the driving frequency of the driving component 2 and the new preferred actuating frequency f_g2The frequency tracking operation is repeated to maintain the driving frequency of the piezoelectric pump 3 at the preferred operating frequency f_g2Next, the transmission efficiency is maintained.

The feedback circuit 4 continuously receives the states (such as the driving voltage or the ground) of the first electrode 31 and the second electrode 32 of the piezoelectric pump 3, during the first control step, the second electrode 32 is the driving voltage, the first electrode 31 is the ground, and the equivalent circuit of the feedback circuit 4 is shown in fig. 4A, the first resistor R1 is connected in parallel with the third resistor R3, and the feedback voltage is (R1// R3) ÷ [ (R1// R3) + R2] × the driving voltage; in addition, in the second control step, the first electrode 31 is the driving voltage, the second electrode 32 is grounded, and the equivalent circuit of the feedback circuit 4 is as shown in fig. 4B, the second resistor R2 is connected in parallel with the third resistor R3, and the feedback voltage is (R2// R3) ÷ [ (R2// R3) + R1] × driving voltage; the feedback circuit 4 transmits the feedback voltage to the microprocessor 1, the microprocessor 1 receives the feedback voltage to determine the driving voltage of the current piezoelectric pump 3, and compares the driving voltage with the modulation signal of the microprocessor 1, if the driving voltage is different from the modulation signal of the microprocessor 1, the feedback voltage is converted into a digital signal through the conversion unit 12, the modulation signal converted into the digital signal is transmitted from the communication unit 13 to the communication interface 213e to adjust the fifth resistor R5 (digital variable resistor), finally, the driving voltage output by the voltage output end 211 of the voltage transformer 21 is divided by the fourth resistor R4 and the fifth resistor R5 of the voltage transformation feedback circuit 213, the divided driving voltage is transmitted back to the voltage transformer 21 from the feedback end 212, so that the voltage output by the voltage transformer is referred to whether the driving voltage thereof meets the expected voltage of the modulation signal, if the difference exists, the output driving voltage is modulated again to make the output driving voltage continuously adjusted to approach the expected voltage of the modulation signal, finally, the driving voltage is adjusted to be consistent with the expected voltage of the modulation signal, the driving voltage received by the piezoelectric pump 3 can meet the expected voltage of the modulation signal of the microprocessor 1 through the steps, when the voltage value of the driving voltage is the actuation voltage value of the piezoelectric pump 3, the piezoelectric pump 3 has a better transmission effect, but the loss caused by the transmission of the driving voltage and the driving voltage which is difficult to maintain at the actuation voltage value during actuation can also cause the reduction of the transmission efficiency, so the driving voltage on the existing piezoelectric pump 3 can be known through the feedback circuit 4, and the driving voltage is adjusted and controlled through the voltage transformer 21 so that the piezoelectric pump 3 can always maintain at the actuation voltage value during actuation to operate, thereby achieving a better transmission effect.

The driving voltage of the piezoelectric pump 3 can be precisely controlled through the feedback circuit 4 and the voltage transformer 21, so that the microprocessor 1 can precisely adjust the voltage value of the driving voltage, for example, the voltage value of the driving voltage is controlled to be the initial voltage value, the closing voltage value, the actuation voltage value, etc.; the initial voltage value and the turn-off voltage value can be between 3 and 7V, and the actuation voltage value can be between 12 and 20V, but not limited thereto.

In summary, the present disclosure provides a micro piezoelectric pump module, when the micro piezoelectric pump module is turned on, a voltage value of a driving voltage output to the piezoelectric pump by a driving component is an initial voltage value, a driving frequency is adjusted and controlled to be consistent with an actuating frequency of the piezoelectric pump under the initial voltage value, so that the piezoelectric pump starts to operate at the initial voltage value, the piezoelectric pump is turned on at a lower initial voltage value, noise generated when the piezoelectric pump is turned on can be reduced, and noise generated when the driving frequency is adjusted to the actuating frequency of the piezoelectric pump from the driving frequency is avoided, after the piezoelectric pump is turned on, the driving voltage is increased from the initial voltage value to the actuating voltage value, the piezoelectric pump starts to operate efficiently, the frequency tracking operation is maintained at a better actuating frequency, and the driving voltage of the piezoelectric pump is maintained at the actuating voltage value through a feedback circuit and a voltage transformation component, so that the piezoelectric pump can continuously maintain a better transmission efficiency, when the piezoelectric pump is shut down, the driving voltage is reduced from the actuation voltage value to the shutdown voltage value (or the initial voltage value), and then the piezoelectric pump is stopped, so that the short-time noise generated when the piezoelectric pump is shut down can be avoided.

Various modifications may be made by those skilled in the art without departing from the scope of the invention as defined by the appended claims.