CN208315189U - Piezoelectric buzzer circuit - Google Patents
Piezoelectric buzzer circuit Download PDFInfo
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- CN208315189U CN208315189U CN201820904589.1U CN201820904589U CN208315189U CN 208315189 U CN208315189 U CN 208315189U CN 201820904589 U CN201820904589 U CN 201820904589U CN 208315189 U CN208315189 U CN 208315189U
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- triode
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- piezo buzzer
- resistor
- transistor
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- 239000003990 capacitor Substances 0.000 description 2
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- 238000000034 method Methods 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
A piezoelectric buzzer circuit, comprising: the circuit comprises a first resistor, a second resistor, a first triode, a second triode, a phase inverter and a piezoelectric buzzer; the first triode and the second triode are the same type of triodes; the base electrode of the first triode is connected with the driving signal, the emitting electrode of the first triode is grounded, and the collector electrode of the first triode is connected with one end of the first resistor and the second pin of the piezoelectric buzzer; the other end of the first resistor is connected with a power supply; a first pin of the piezoelectric buzzer is connected with one end of the second resistor and a collector of the second triode; the other end of the second resistor is connected with a power supply; the emitter of the second triode is grounded, and the base of the second triode is respectively connected with one end of the inverter and the power supply; the other end of the inverter is connected with the driving signal. The embodiment of the utility model provides a circuit does not need extra power boost circuit, can make piezoelectric type buzzer both ends produce 2 times mains voltage's signal, and the signal that produces keeps unanimous with signal source frequency.
Description
Technical field
The utility model belongs to driving circuit technical field, and in particular to a kind of piezo buzzer circuit.
Background technique
In the existing circuit including piezo buzzer, buzzer drive circuit is generally used single-ended drive side
Formula.As shown in Figure 1, the circuit includes resistance R1, triode Q1, resistance R5 and buzzer BP1, triode Q1 is three pole of NPN type
Pipe, driving signal BEEP_PWM are provided by main control chip, are connect with one end of resistance R1, the other end and triode Q1 of resistance R1
Base stage B connection, the collector C of triode Q1 connect with the second pin 2 of one end of resistance R5 and buzzer BP1, triode
The emitter E of Q1 is grounded GND, the first pin 1 of the other end connection power supply VCC and buzzer BP1 of resistance R5.
When driving signal BEEP_PWM is high level, triode Q1 conducting, the second pin 2 of buzzer BP1 is low electricity
Flat, the first pin 1 of buzzer BP1 connects power supply VCC, the voltage difference between the first pin 1 and second pin 2 of buzzer BP1
For VCC；When driving signal BEEP_PWM is low level, triode Q1 cut-off, the second pin 2 of buzzer BP1 is high level,
Voltage difference between the first pin 1 and second pin 2 of buzzer BP1 is 0.Under normal circumstances, driving signal BEEP_PWM is
Pwm signal with certain frequency, therefore, the both ends buzzer BP1 can generate the signal that amplitude is VCC, generation and driving signal
The sound of BEEP_PWM same frequency.Current most of digital circuitries only have two kinds of voltages of 3.3V and 5V, and therefore, use is existing
The circuit including piezo buzzer, the voltage that power supply VCC is capable of providing is lower.When the voltage of power supply VCC is lower, buzzing
Device volume is also corresponding lower.
Utility model content
The lower technical problem of buzzer volume, the utility model embodiment propose one kind when in order to solve above-mentioned low pressure
Piezo buzzer circuit.
A kind of piezo buzzer circuit, the piezo buzzer circuit include: first resistor, second resistance, the one or three
Pole pipe, the second triode, phase inverter and piezo buzzer；First triode and the second triode are three poles of same type
Pipe；
The base stage of first triode is connect with driving signal, the emitter ground connection of the first triode, the collection of the first triode
Electrode connects one end of first resistor and the second pin of piezo buzzer；
Another termination power of first resistor；
First pin of piezo buzzer connects one end of second resistance and the collector of the second triode；
Another termination power of second resistance；
The emitter of second triode is grounded, and the base stage of the second triode connects with one end of phase inverter and power supply respectively
It connects；
The other end of the phase inverter is connect with the driving signal.
Further, phase inverter is third transistor, and third transistor is NPN triode, the base stage of third transistor with
Driving signal connection, the emitter ground connection of third transistor, the collector of third transistor connect to power supply.
Further, the base stage of the third transistor is connect by resistance with driving signal.
Further, the collector of the third transistor is connected to power supply by resistance.
Further, the base stage of first triode is connect by resistance with driving signal.
Further, the base stage of second triode is connected to power supply by resistance.
Further, the piezo buzzer circuit further include: 3rd resistor, the 4th resistance, the 5th resistance and the 6th
Resistance；
The base stage of first triode is connect by 3rd resistor with driving signal；
The base stage of second triode is connected to power supply by the 5th resistance and the 6th resistance；
The base stage of third transistor connects the 4th resistance and connect with driving signal, and the collector of third transistor passes through the 5th electricity
Resistance connects to power supply.
Further, the first triode and the second triode are NPN triode.
Further, the first triode and the second triode are PNP triode.
Further, the phase inverter is NOT gate.
The utility model has the beneficial effects that the piezo buzzer circuit that the utility model embodiment proposes, compared to existing
Some buzzer single-ended drive circuits, do not need additional power boost circuit, and piezo buzzer both ends can be made to generate 2 times
The signal of supply voltage, and the signal generated is consistent with signal source frequency.Also, the pressure that the utility model embodiment proposes
Electric-type buzzer circuit, structure is simple, high reliablity, is conducive to save circuit area and cost.
Detailed description of the invention
Fig. 1 is the structure chart of the existing circuit including piezo buzzer；
Fig. 2 is the structure chart for the piezo buzzer circuit that the utility model embodiment proposes；
Fig. 3 is the buzzer working waveform figure for the piezo buzzer circuit that the utility model embodiment proposes.
Specific embodiment
For the purpose of this utility model, technical solution and advantage is more clearly understood, below in conjunction with specific embodiment, and
Referring to attached drawing, the utility model is further described.But as known to those skilled in the art, the utility model is not limited to
Attached drawing and following embodiment.
The utility model embodiment proposes a kind of piezo buzzer circuit, which includes: first resistor, the second electricity
Resistance, the first triode, the second triode, phase inverter and piezo buzzer；First triode and the second triode are mutually similar
The triode of type can be all NPN triode, or be all PNP triode；The base stage and driving signal of first triode connect
It connects, the emitter of the first triode ground connection, the collector of the first triode connects one end and the piezo buzzer of first resistor
Second pin；Another termination power of first resistor；First pin of piezo buzzer connects one end and second of second resistance
The collector of triode；Another termination power of second resistance；The emitter of second triode is grounded, the base stage of the second triode
It is connect respectively with one end of phase inverter and power supply；The other end of phase inverter is connect with the driving signal.
The phase inverter is third transistor, and third transistor is NPN triode, and the base stage of third transistor and driving are believed
Number connection, the emitter ground connection of third transistor, the collector of third transistor connects to power supply.
The base stage of the third transistor is connect by resistance with driving signal.
The collector of the third transistor is connected to power supply by resistance.
The base stage of first triode is connect by resistance with driving signal.
The base stage of second triode is connected to power supply by resistance.
The phase inverter can also be NOT gate.
Below using the first triode and the second triode as NPN triode, phase inverter is third transistor, third transistor
For NPN triode, the piezo buzzer circuit proposed to the utility model embodiment is further detailed.Such as figure
Shown in 2, which includes: first resistor R1, second resistance R2,3rd resistor R3, the 4th resistance R4, the 5th resistance R5, the 6th
Resistance R6, the first triode Q1, the second triode Q2, third transistor Q3 and piezo buzzer BP1.
Driving signal BEEP_PWM should be ensured that the first triode Q1, the second triode Q2 and third transistor Q3 can be just
Often work.Driving signal BEEP_PWM is provided by control chip, and control chip can be main control chip.
One end of 3rd resistor R3 is connect with driving signal BEEP_PWM, and the other end connects the base stage B of the first triode Q1.
The emitter E of first triode Q1 is grounded GND, and the collector C of the first triode Q1 connects one end of first resistor R1
With the second pin 2 of piezo buzzer BP1.
Another termination power VCC of first resistor R1.
The first pin 1 of piezo buzzer BP1 connects one end of second resistance R2 and the collector C of the second triode Q2.
Another termination power VCC of second resistance R2.
The emitter E of second triode Q2 is grounded GND, and the base stage B of the second triode Q2 connects one end of the 6th resistance R6.
One end of the 5th resistance R5 of another termination of 6th resistance R6 and the collector C of third transistor Q3.
Another termination power VCC of 5th resistance R5.
The emitter E of third transistor Q3 is grounded GND, and the base stage B of third transistor Q3 connects one end of the 4th resistance R4.
Another termination driving signal BEEP PWM of 4th resistance R4.
When driving signal BEEP_PWM is high level, the first triode Q1 and third transistor Q3 conducting, the three or three pole
The collector C of pipe Q3 is pulled low, and the second triode Q2 cut-off, the first pin 1 of piezo buzzer BP1 meets power supply VCC, and second
Pin 2 is grounded, and the pressure difference of two pins of piezo buzzer BP1 is V1-V2=VCC.
When driving signal BEEP_PWM is low level, the first triode Q1 and third transistor Q3 cut-off, the three or three pole
The collector C of pipe Q3 is raised, and the second triode Q2 conducting, the second pin 2 of piezo buzzer BP1 meets power supply VCC, and first
Pin 1 is grounded, and the pressure difference of two pins of piezo buzzer BP1 is V1-V2=-VCC.
Since driving signal BEEP_PWM is period pwm signal, and piezo buzzer being capable of the equivalent spy at capacitor
Property, therefore, in half period, the pressure difference of two pins of piezo buzzer BP1 is VCC, in lower half period, piezoelectricity
The pressure difference of two pins of formula buzzer BP1 is-VCC, then in one cycle, two pins of piezo buzzer BP1 it
Between there are voltage reversals, the both ends piezo buzzer BP1 can be equivalent to and produce the signal of 2 times of VCC, piezoelectric type bee can be made
Ring device BP1 can generate bigger sound.Fig. 3 gives in the piezo buzzer circuit that the utility model embodiment proposes and presses
The work wave schematic diagram of electric-type buzzer.
Piezo buzzer circuit that the utility model embodiment proposes, can be equivalent at capacitor using piezo buzzer
Characteristic, even if the voltage between two pins of piezo buzzer inverts, piezo buzzer be can still work normally,
Therefore, the utility model embodiment uses a piezo buzzer circuit, makes piezo buzzer in low voltage circuit system
Middle work makes piezo buzzer obtain the drive of 2 times of VCC amplitudes in the case where not increased additional power supply boost chip
Dynamic signal, makes piezo buzzer issue the sound of enough loudness.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example
Point is contained at least one embodiment or example of the utility model.In the present specification, to the schematic table of above-mentioned term
Stating may not refer to the same embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be
It can be combined in any suitable manner in any one or more embodiment or examples.
More than, the embodiments of the present invention is illustrated.But the utility model is not limited to above-mentioned implementation
Mode.Within the spirit and principle of the utility model, any modification, equivalent substitution, improvement and etc. done, should be included in
Within the protection scope of the utility model.
Claims (10)
1. a kind of piezo buzzer circuit, which is characterized in that the piezo buzzer circuit includes: first resistor, the second electricity
Resistance, the first triode, the second triode, phase inverter and piezo buzzer；First triode and the second triode are mutually similar
The triode of type；
The base stage of first triode is connect with driving signal, the emitter ground connection of the first triode, the collector of the first triode
Connect one end of first resistor and the second pin of piezo buzzer；
Another termination power of first resistor；
First pin of piezo buzzer connects one end of second resistance and the collector of the second triode；
Another termination power of second resistance；
The emitter of second triode is grounded, and the base stage of the second triode is connect with one end of phase inverter and power supply respectively；
The other end of phase inverter is connect with the driving signal.
2. piezo buzzer circuit according to claim 1, which is characterized in that the phase inverter is third transistor,
Third transistor is NPN triode, and the base stage of third transistor is connect with driving signal, the emitter ground connection of third transistor,
The collector of third transistor connects to power supply.
3. piezo buzzer circuit according to claim 2, which is characterized in that the base stage of the third transistor passes through
Resistance is connect with driving signal.
4. piezo buzzer circuit according to claim 2, which is characterized in that the collector of the third transistor is logical
Resistance is crossed to connect to power supply.
5. piezo buzzer circuit according to claim 1, which is characterized in that the base stage of first triode passes through
Resistance is connect with driving signal.
6. piezo buzzer circuit according to claim 1, which is characterized in that the base stage of second triode passes through
Resistance connects to power supply.
7. piezo buzzer circuit according to claim 2, which is characterized in that the piezo buzzer circuit also wraps
It includes: 3rd resistor, the 4th resistance, the 5th resistance and the 6th resistance；
The base stage of first triode is connect by 3rd resistor with driving signal；
The base stage of second triode is connected to power supply by the 5th resistance and the 6th resistance；
The base stage of third transistor connects the 4th resistance and connect with driving signal, the collector of third transistor by the 5th resistance with
Power supply connection.
8. piezo buzzer circuit according to any one of claim 1 to 7, which is characterized in that the first triode and
Second triode is NPN triode.
9. piezo buzzer circuit according to any one of claim 1 to 7, which is characterized in that the first triode and
Second triode is PNP triode.
10. piezo buzzer circuit according to claim 1, which is characterized in that the phase inverter is NOT gate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820904589.1U CN208315189U (en) | 2018-06-11 | 2018-06-11 | Piezoelectric buzzer circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820904589.1U CN208315189U (en) | 2018-06-11 | 2018-06-11 | Piezoelectric buzzer circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208315189U true CN208315189U (en) | 2019-01-01 |
Family
ID=64707180
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820904589.1U Active CN208315189U (en) | 2018-06-11 | 2018-06-11 | Piezoelectric buzzer circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208315189U (en) |
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2018
- 2018-06-11 CN CN201820904589.1U patent/CN208315189U/en active Active
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| TR01 | Transfer of patent right |
Effective date of registration: 20200408 Address after: 510530 Guangdong city of Guangzhou province YUNPU Whampoa district four Road No. 6 Patentee after: Guangzhou Shiyuan Electronic Technology Company Limited Address before: 510530 Guangdong city of Guangzhou province YUNPU Whampoa district four Road No. 6 Co-patentee before: GUANGZHOU RUIXIN ELECTRONICS Co.,Ltd. Patentee before: Guangzhou Shiyuan Electronic Technology Company Limited |