CN212907052U - Buzzer driving circuit - Google Patents
Buzzer driving circuit Download PDFInfo
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- CN212907052U CN212907052U CN202021349896.1U CN202021349896U CN212907052U CN 212907052 U CN212907052 U CN 212907052U CN 202021349896 U CN202021349896 U CN 202021349896U CN 212907052 U CN212907052 U CN 212907052U
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Abstract
The utility model discloses a buzzer drive circuit, including diode D105, diode D107, electric capacity C128, resistance R122, resistance R123, triode TR102 and buzzer BU100, diode D105 anodal power VDD of connecting, grounded electric capacity C128, diode D107 negative pole and a buzzer BU100 pin are connected respectively to diode D105 negative pole, and diode D107 positive pole and triode TR102 collecting electrode are connected respectively to another pin of buzzer BU100, triode TR102 projecting pole ground connection, and ground resistance R123 and resistance R122 are connected respectively to triode TR102 base, and drive signal is connected to the resistance R122 other end. The utility model discloses the circuit can insert programmable controller, accepts programmable controller's control, and circuit structure is simple, and is with low costs, and stability is high.
Description
Technical Field
The utility model relates to a drive circuit specifically is a buzzer drive circuit.
Background
Typical consumer electronics products are: the function conversion and voice alarm of computer, multimedia, automobile and communication product, household electrical appliance, electronic toy, automatic control device and various electronic products and various instruments and equipment, these thousands of products can all make a sound, they all make a sound through the inside electroacoustic component, the buzzer is used as the sound component and is applied to these fields extensively.
The buzzer can be divided into a piezoelectric buzzer and an electromagnetic buzzer, wherein the sound production principle of the piezoelectric buzzer is that a piezoelectric ceramic piece after being pressurized is pasted on a vibrating metal piece, and when alternating current is added, mechanical deformation extension and contraction are generated due to piezoelectric effect, and the metal piece vibrates to produce sound by utilizing the characteristic. The electromagnetic buzzer makes the electromagnetic coil generate magnetic field by using the audio signal current generated by the oscillator through the electromagnetic coil, and the vibrating diaphragm periodically vibrates to sound under the interaction of the electromagnetic coil and the magnet. The driving voltage of the piezoelectric buzzer is higher than that of the electromagnetic buzzer, but the power consumption of the piezoelectric buzzer is lower than that of the electromagnetic buzzer, so that the piezoelectric buzzer has the advantages of high temperature resistance, low temperature resistance, small volume, light weight, thin thickness, power saving, pleasant sound, stable and reliable performance and the like, and is more suitable for various household appliances, communication equipment, computer peripheral equipment and office equipment.
Some existing audio driving methods include using a dedicated audio power amplifier and a digital-to-analog converter, which can obtain flexible driving waveforms and sound quality effects, but the cost far exceeds that of discrete device schemes, and is not suitable for applications such as cue tones.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a buzzer drive circuit to solve the problem that proposes among the above-mentioned background art.
In order to achieve the above object, the utility model provides a following technical scheme:
the utility model provides a buzzer drive circuit, includes diode D105, diode D107, electric capacity C128, resistance R122, resistance R123, triode TR102 and buzzer BU100, diode D105 anodal power VDD of connecting, grounded capacitance C128, diode D107 negative pole and a buzzer BU100 pin are connected respectively to diode D105 negative pole, and diode D107 positive pole and triode TR102 collecting electrode are connected respectively to another pin of buzzer BU100, and triode TR102 emitter ground, and grounded resistance R123 and resistance R122 are connected respectively to triode TR102 base, and drive signal is connected to the resistance R122 other end.
As the utility model discloses further preferred scheme again, the drive signal that the resistance R122 other end is connected comes from the IO mouth of singlechip.
As a further preferred embodiment of the present invention, the transistor TR102 is an NPN transistor.
As a further preferred embodiment of the present invention, the voltage of the power supply VDD is 12V.
As a further preferable embodiment of the present invention, the diode D105 and the diode D107 are both diodes of type M4007.
Compared with the prior art, the beneficial effects of the utility model are that: the utility model discloses the circuit can insert programmable controller, accepts programmable controller's control, and circuit structure is simple, and is with low costs, and stability is high.
Drawings
Fig. 1 is a circuit diagram of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The embodiment of the utility model provides an in, a buzzer drive circuit, including diode D105, diode D107, electric capacity C128, resistance R122, resistance R123, triode TR102 and buzzer BU100, diode D105 anodal power VDD of connecting, grounded electric capacity C128, diode D107 negative pole and a buzzer BU100 pin are connected respectively to diode D105 negative pole, and diode D107 positive pole and triode TR102 collecting electrode are connected respectively to another pin of buzzer BU100, and triode TR102 projecting pole ground connection, ground resistance R123 and resistance R122 are connected respectively to triode TR102 base, and drive signal is connected to the resistance R122 other end; a driving signal connected to the other end of the resistor R122 comes from an IO port of the single chip microcomputer; the triode TR102 adopts an NPN type triode; the voltage of the power supply VDD is 12V; the diode D105 and the diode D107 are both diodes with the model number M4007.
Referring to fig. 1, when the IO port Mo _ Buz SOGF of the single chip microcomputer is at a high level, the transistor TR102 is turned on, and the buzzer BU100 has a current and will sound.
When the IO port Mo _ Buz SOGF of the single chip microcomputer is at a low level, the triode TR102 is cut off, and the buzzer BU100 has no current and does not respond.
Therefore, when the IO port of the single chip inputs the PWM pulse, the buzzer BU100 will sound. The working process is simple, and the function of each element is seen:
resistor R123 is a pull-down resistor for the purpose of having a stable low level at the base of transistor TR102 when the Mo _ Buz SOGF node is suspended.
The resistor R122 is a base resistor of the transistor TR102, and limits a base current.
The capacitor C128 is a filter capacitor and plays a role in filtering.
The transistor TR102 functions as a switching tube to control the buzzer BU 100.
The diode D107 is a freewheeling diode, and because the coil is arranged inside the buzzer BU100, when the diode D is currently turned off, a large induced electromotive force is generated, and a diode is added to provide an energy release path for the diode D. The diode is used for unidirectional conductivity and has a follow current protection function.
The diode D105 is an anti-reverse diode and prevents current from flowing backwards to damage the MCU when the power is turned off.
To sum up, the utility model discloses the circuit can insert programmable controller, accepts programmable controller's control, and circuit structure is simple, and is with low costs, and stability is high.
It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (5)
1. The utility model provides a buzzer drive circuit, its characterized in that, including diode D105, diode D107, electric capacity C128, resistance R122, resistance R123, triode TR102 and buzzer BU100, diode D105 positive pole is connected power VDD, grounded capacity C128, diode D107 negative pole and a buzzer BU100 pin are connected respectively to diode D105 negative pole, diode D107 positive pole and triode TR102 collecting electrode are connected respectively to buzzer BU100 another pin, triode TR102 emitter ground, ground resistance R123 and resistance R122 are connected respectively to triode TR102 base, the drive signal is connected to the resistance R122 other end.
2. The buzzer driving circuit according to claim 1, wherein the driving signal connected to the other end of the resistor R122 is from an IO port of a single chip microcomputer.
3. A buzzer driving circuit as claimed in claim 2, wherein said transistor TR102 is an NPN transistor.
4. The buzzer driving circuit as claimed in claim 2, wherein said power supply VDD voltage is 12V.
5. A buzzer driving circuit as claimed in claim 3, wherein said diode D105 and said diode D107 are both diodes of type M4007.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021349896.1U CN212907052U (en) | 2020-07-10 | 2020-07-10 | Buzzer driving circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021349896.1U CN212907052U (en) | 2020-07-10 | 2020-07-10 | Buzzer driving circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212907052U true CN212907052U (en) | 2021-04-06 |
Family
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021349896.1U Active CN212907052U (en) | 2020-07-10 | 2020-07-10 | Buzzer driving circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212907052U (en) |
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2020
- 2020-07-10 CN CN202021349896.1U patent/CN212907052U/en active Active
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