CN207381089U - A kind of piezo buzzer driving circuit - Google Patents
A kind of piezo buzzer driving circuit Download PDFInfo
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- CN207381089U CN207381089U CN201721570039.2U CN201721570039U CN207381089U CN 207381089 U CN207381089 U CN 207381089U CN 201721570039 U CN201721570039 U CN 201721570039U CN 207381089 U CN207381089 U CN 207381089U
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- piezo buzzer
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Abstract
The utility model provides a kind of piezo buzzer driving circuit, including control signal output, signal inversion circuit and piezo buzzer；The square-wave signal that one low level is zero is exported by control signal output, then the square-wave signal that control signal output exports is converted to two frequencies are identical, square-wave signal of opposite in phase by signal inversion circuit, and by the two frequencies are identical, opposite in phase square-wave signal is delivered to piezo buzzer respectively both ends, the amplitude of variation of piezo buzzer both end voltage is made to be more than the amplitude for the square-wave signal that control signal output exports, and then improves the decibels of piezo buzzer output sound.Using piezo buzzer driving circuit provided by the utility model, no need to increase the volume of piezo buzzer or increase booster circuits, you can improves the decibels of piezo buzzer output sound, production is at low cost.
Description
Technical field
The utility model is related to electronic technology field, more particularly to a kind of piezo buzzer driving circuit.
Background technology
Piezo buzzer is that piezoelectric material is pasted onto on sheet metal, when piezoelectric material and sheet metal both ends are applied with one
After a voltage, because inverse piezoelectric effect, piezo will generate mechanically deform and send the sound.Usual buzzer has all been alarm
Or prompt tone effect, so buzzer usually requires that loud, and volume is small, but volume is smaller, vibrates cavity
Space is smaller, and volume is caused to become smaller.In the case of piezo buzzer given volume, point of piezo buzzer output sound
Shellfish number is influenced by the voltage swing at piezo buzzer both ends, and the voltage difference at piezo buzzer both ends is bigger, piezoelectric type buzzing
The decibels of device output sound are bigger.
In general, production cost, the general square-wave signal exported using director port directly drive piezoelectric type bee in order to control
Ring device, and the voltage difference at piezo buzzer both ends generally only has 5V, and the piezo buzzer used is caused to be only capable of reaching at 20CM
There is 80 decibels of sound, alarm or the effect prompted are not ideal enough.
Utility model content
To solve above-mentioned the deficiencies in the prior art, the utility model provides a kind of piezo buzzer driving electricity
Road, including control signal output, signal inversion circuit and piezo buzzer；The control signal output output one is low
The first square-wave signal that level is zero；The signal inversion circuit is used for the first square wave for exporting the control signal output
Signal is converted to identical frequency, the second square-wave signal of opposite in phase and third party's ripple signal, and by second square-wave signal
It is delivered to the both ends of the piezo buzzer respectively with third party's ripple signal.
Further, the signal inversion circuit includes first voltage comparator and second voltage comparator；Described first
The in-phase input end of the inverting input of voltage comparator and the second voltage comparator passes through resistance R1 and the control
Signal output part connects；The in-phase input end of the first voltage comparator connects power supply by resistance R2 with resistance R3 respectively
VCC and ground wire；The inverting input of the second voltage comparator connects power supply VCC and ground by resistance R2 with resistance R3 respectively
Line；
The output terminal of the first voltage comparator is by one end of the resistance R4 connections piezo buzzer, and described
The other end that the output terminal of two voltage comparators passes through the resistance R5 connections piezo buzzer；
The power supply of the first voltage comparator and the second voltage comparator is power supply VCC；
The high level electricity of the output voltage of the power supply VCC and the first square-wave signal of control signal output output
It presses identical.
Further, swept resistance RF1 and swept resistance RF2 are further included；The output terminal of the first voltage comparator leads to
Cross the inverting input of the swept resistance RF1 connections first voltage comparator；The output of the second voltage comparator
The inverting input that end passes through the swept resistance RF2 connections second voltage comparator.
Further, the resistance value of the resistance R1, the resistance value of resistance R2, the resistance value of resistance R3, the electricity of resistance R4
Resistance value and the resistance value of resistance R5 are 10k Ω.
Piezo buzzer driving circuit provided by the utility model, exporting a low level by control signal output is
Then the square-wave signal that control signal output exports is converted to two frequencies by zero square-wave signal by signal inversion circuit
Identical, opposite in phase square-wave signal, and by the two frequencies are identical, square-wave signal of opposite in phase is delivered to piezoelectric type respectively
The both ends of buzzer make the amplitude of variation of piezo buzzer both end voltage be more than the square-wave signal of control signal output output
Amplitude, and then improve piezo buzzer output sound decibels.Using piezo buzzer provided by the utility model
Driving circuit, no need to increase the volume of piezo buzzer or increase booster circuits, you can improves piezo buzzer output
The decibels of sound, production are at low cost.
Description of the drawings
It in order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is made some and is simply introduced, it should be apparent that, the accompanying drawings in the following description
It is some embodiments of the utility model, for those of ordinary skill in the art, before not making the creative labor property
It puts, can also be obtained according to these attached drawings other attached drawings.
Fig. 1 is the circuit diagram of piezo buzzer driving circuit provided by the utility model；
Fig. 2 is the circuit diagram of another embodiment provided by the utility model；
Fig. 3 is the voltage oscillogram of part of nodes in the utility model.
Reference numeral：
10 control signal output, 20 signal inversion circuit, 21 first voltage comparator
22 second voltage comparator, 23 first node
Specific embodiment
It is new below in conjunction with this practicality to make the purpose, technical scheme and advantage of the utility model embodiment clearer
Attached drawing in type embodiment, the technical scheme in the utility model embodiment is clearly and completely described, it is clear that is retouched
The embodiment stated is the utility model part of the embodiment, instead of all the embodiments.Based on the implementation in the utility model
Example, those of ordinary skill in the art's all other embodiments obtained without creative efforts, belongs to
The scope of the utility model protection.
" first ", " second " and the similar word used in the utility model embodiment be not offered as any order,
Quantity or importance, and be only intended to distinguish different components.The similar word such as " comprising " or "comprising" means
Element before the word either cover the element for appearing in the word presented hereinafter or object and its be equal by object, and is not excluded for
Other elements or object." connection " either the similar word such as " connected " is not limited to physics or mechanical connection, but
It can include electrical connection, it is either directly or indirect.
Fig. 1 is the schematic diagram for the piezo buzzer driving circuit that the utility model embodiment provides；As shown in Figure 1, this
The piezo buzzer driving circuit that utility model embodiment provides, including control signal output 10, signal inversion circuit 20
And piezo buzzer 30；The control signal output 10 exports the first square-wave signal that a low level is zero；The letter
It is identical, opposite in phase that the first square-wave signal that the control signal output 10 exports is converted to frequency by number negative circuit 20
Second square-wave signal and third party's ripple signal, and second square-wave signal and third party's ripple signal are delivered to institute respectively
State the both ends of piezo buzzer 30.
The signal inversion circuit 20 includes first voltage comparator 21 and second voltage comparator 22；The first voltage
The in-phase input end of the inverting input of comparator 21 and the second voltage comparator 22 passes through resistance R1 and the control
Signal output part 10 connects；The in-phase input end of the first voltage comparator 21 connects electricity by resistance R2 with resistance R3 respectively
Source VCC and ground wire；The inverting input of the second voltage comparator 22 connects power supply VCC by resistance R2 with resistance R3 respectively
And ground wire；
The output terminal of the first voltage comparator 21 passes through one end of the resistance R4 connections piezo buzzer 30, institute
The output terminal for stating second voltage comparator 22 passes through the other end of the resistance R5 connections piezo buzzer 30；
The power supply of the first voltage comparator 21 and the second voltage comparator 22 is power supply VCC；
The high level of the output voltage of the power supply VCC and the first square-wave signal of the control signal output 10 output
Voltage is identical.
When it is implemented, as shown in Figure 1, power supply VCC passes sequentially through resistance R2, resistance R3 is connected to ground wire, resistance R2 and
The common port of resistance R3 is first node 23, under the effect of the partial pressure of resistance R2 and resistance R3, the voltage VD1 at first node 23
Less than the output voltage of power supply VCC；As shown in figure 3, the wherein square-wave signal VI N first party that signal output part exports in order to control
Ripple signal, due to the high level voltage for the first square-wave signal that the output voltage of power supply VCC is exported with control signal output 10
It is identical, therefore the voltage VD1 at first node 23 is less than the high level for the first square-wave signal that control signal output 10 exports
Voltage；Meanwhile the low level of the first square-wave signal of the output of control signal output 10 is zero, the voltage at first node 23
VD1 is more than the low level voltage for the first square-wave signal that control signal output 10 exports；
The in-phase input end of first voltage comparator 21 is connected to first node 23, and the reverse phase of first voltage comparator 21 is defeated
Enter end and be connected to control signal output 10, the power supply of first voltage comparator 21 is power supply VCC；As shown in figure 3, wherein
VOUT1 be 21 output terminal of first voltage comparator output voltage, i.e. the second square-wave signal；When control signal output 10 exports
During high level, the voltage of the in-phase input end of first voltage comparator 21 is less than the voltage of inverting input, and first voltage compares
The output terminal of device 21 exports low level, at this time VOUT1=0V；When control signal output 10 exports low level, first voltage
The voltage of the in-phase input end of comparator 21 is more than the voltage of inverting input, and the output terminal output of first voltage comparator 21 is high
Level, at this time VOUT1=VCC.
The in-phase input end of second voltage comparator 22 is connected to control signal output 10, second voltage comparator 22
Inverting input is connected to first node 23, and the power supply of second voltage comparator 22 is power supply VCC；As shown in figure 3, wherein
VOUT2 is the output voltage of 21 output terminal of first voltage comparator, i.e. third party's ripple signal；When control signal output 10 exports
During high level, the voltage of the in-phase input end of second voltage comparator 22 is more than the voltage of inverting input, and second voltage compares
The output terminal of device 22 exports high level, at this time VOUT2=VCC；When control signal output module exports low level, second voltage
The voltage of the in-phase input end of comparator 22 is less than the voltage of inverting input, and the output terminal output of first voltage comparator 21 is low
Level, at this time VOUT3=0V.
Above procedure can be seen that the output voltage of first voltage comparator 21 and the output electricity of second voltage comparator 22
The amplitude of pressure is identical, phase differs 180 °；As shown in Figure 1, the output terminal of first voltage comparator 21 is pressed by resistance R4 connections
One end of electric-type buzzer 30, the output terminal of second voltage comparator 22 pass through the another of resistance R5 connections piezo buzzer 30
End；Therefore, as shown in figure 3, the voltage V=VOUT1-VOUT2 at 30 both ends of piezo buzzer, 30 both ends of piezo buzzer electricity
The variable quantity of pressure is more than the amplitude for the square-wave signal that control signal output 10 exports, and makes the both ends of piezo buzzer 30 have
The voltage difference of bigger, and then improve the decibels that piezo buzzer 30 exports sound.
The piezo buzzer driving circuit that the utility model embodiment provides is low by control signal output output one
Then the square-wave signal that control signal output exports is converted to two by the square-wave signal that level is zero by signal inversion circuit
A frequency is identical, the square-wave signal of opposite in phase, and by the two frequencies are identical, square-wave signal of opposite in phase is delivered to respectively
The both ends of piezo buzzer make the amplitude of variation of piezo buzzer both end voltage be more than the side of control signal output output
The amplitude of ripple signal, and then improve the decibels of piezo buzzer output sound.It is provided using the utility model embodiment
Piezo buzzer driving circuit, no need to increase the volume of piezo buzzer or increase booster circuits, you can improves piezoelectricity
Formula buzzer exports the decibels of sound, and production is at low cost.
Preferably, swept resistance RF1 and swept resistance RF2 are further included；The output terminal of the first voltage comparator 21 leads to
Cross the inverting input of the swept resistance RF1 connections first voltage comparator 21；The output of the second voltage comparator 22
The inverting input that end passes through the swept resistance RF2 connections second voltage comparator 22.
When it is implemented, the output terminal of first voltage comparator 21 passes through the swept resistance RF1 connections first voltage ratio
Compared with the inverting input of device 21；The output terminal of the second voltage comparator 22 passes through swept resistance RF2 connections second electricity
Press the inverting input of comparator 22.The resistance value accessed by adjusting swept resistance RF1 in circuit can adjust first voltage
The high level voltage of 21 output terminal of comparator output, the resistance value accessed by adjusting swept resistance RF2 in circuit can be adjusted
The high level voltage of 22 output terminal of second voltage comparator output, so as to adjust the voltage difference at 30 both ends of piezo buzzer, into
And the decibels size of the output of piezo buzzer 30 can be adjusted.
Preferably, the resistance value of the resistance R1, the resistance value of resistance R2, the resistance value of resistance R3, the resistance of resistance R4
Value and the resistance value of resistance R5 are 10k Ω.
Although more herein used such as control signal output, signal inversion circuit, piezo buzzer, electricity
The terms such as comparator, power supply, square-wave signal, amplitude, voltage difference, node are pressed, but it does not preclude the possibility of using other terms.
The use of these terms is merely for the convenience of describing and explaining the nature of the invention；It is construed as any one
Additional limitation is all contrary to the spirit of the present invention.
Finally it should be noted that：Various embodiments above is only to illustrate the technical solution of the utility model rather than it is limited
System；Although the utility model is described in detail with reference to foregoing embodiments, those of ordinary skill in the art should
Understand：It can still modify to the technical solution recorded in foregoing embodiments either to which part or whole
Technical characteristic carries out equivalent substitution；And these modifications or replacement, the essence of appropriate technical solution is not made to depart from this practicality newly
The scope of each embodiment technical solution of type.
Claims (4)
1. a kind of piezo buzzer driving circuit, it is characterised in that：Including control signal output (10), signal inversion circuit
(20) and piezo buzzer (30)；The control signal output (10) exports the first square wave letter that a low level is zero
Number；The signal inversion circuit (20) is used to the first square-wave signal of the control signal output (10) output being converted to frequency
Rate is identical, the second square-wave signal of opposite in phase and third party's ripple signal, and by second square-wave signal and the third party
Ripple signal is delivered to the both ends of the piezo buzzer (30) respectively.
2. piezo buzzer driving circuit according to claim 1, it is characterised in that：The signal inversion circuit (20)
Including first voltage comparator (21) and second voltage comparator (22)；The inverting input of the first voltage comparator (21)
It is connected with the in-phase input end of the second voltage comparator (22) by resistance R1 with the control signal output (10)；
The in-phase input end of the first voltage comparator (21) connects power supply VCC and ground wire by resistance R2 with resistance R3 respectively；Institute
The inverting input for stating second voltage comparator (22) connects power supply VCC and ground wire by resistance R2 with resistance R3 respectively；
The output terminal of the first voltage comparator (21) passes through one end of the resistance R4 connections piezo buzzer (30), institute
The output terminal for stating second voltage comparator (22) passes through the other end of the resistance R5 connections piezo buzzer (30)；
The power supply of the first voltage comparator (21) and the second voltage comparator (22) is power supply VCC；
The high level electricity of the output voltage of the power supply VCC and the first square-wave signal of the control signal output (10) output
It presses identical.
3. piezo buzzer driving circuit according to claim 2, it is characterised in that：Further include swept resistance RF1 and
Swept resistance RF2；The output terminal of the first voltage comparator (21) passes through the swept resistance RF1 connections first voltage
The inverting input of comparator (21)；The output terminal of the second voltage comparator (22) passes through the swept resistance RF2 connections
The inverting input of the second voltage comparator (22).
4. piezo buzzer driving circuit according to claim 2, it is characterised in that：The resistance value of the resistance R1,
The resistance value of resistance R2, the resistance value of resistance R3, the resistance value of the resistance value of resistance R4 and resistance R5 are 10k Ω.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721570039.2U CN207381089U (en) | 2017-11-22 | 2017-11-22 | A kind of piezo buzzer driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721570039.2U CN207381089U (en) | 2017-11-22 | 2017-11-22 | A kind of piezo buzzer driving circuit |
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| Publication Number | Publication Date |
|---|---|
| CN207381089U true CN207381089U (en) | 2018-05-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721570039.2U Active CN207381089U (en) | 2017-11-22 | 2017-11-22 | A kind of piezo buzzer driving circuit |
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| CN (1) | CN207381089U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112614475A (en) * | 2020-12-30 | 2021-04-06 | 深圳飞安瑞科技股份有限公司 | Piezoelectric buzzer volume enhancement circuit, method, electronic device and storage medium |
-
2017
- 2017-11-22 CN CN201721570039.2U patent/CN207381089U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112614475A (en) * | 2020-12-30 | 2021-04-06 | 深圳飞安瑞科技股份有限公司 | Piezoelectric buzzer volume enhancement circuit, method, electronic device and storage medium |
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