CN110689870A - Buzzer control circuit and buzzer device - Google Patents
Buzzer control circuit and buzzer device Download PDFInfo
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- CN110689870A CN110689870A CN201910804473.XA CN201910804473A CN110689870A CN 110689870 A CN110689870 A CN 110689870A CN 201910804473 A CN201910804473 A CN 201910804473A CN 110689870 A CN110689870 A CN 110689870A
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- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K9/00—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers
- G10K9/12—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers electrically operated
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R3/00—Circuits for transducers, loudspeakers or microphones
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- Acoustics & Sound (AREA)
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Abstract
The invention discloses a buzzer control circuit and a buzzer device, comprising: the motor pulse width modulator is used for adjusting the square wave voltage signal into a waveform with periodically changed pulse width, and the pulse width of the waveform is firstly increased from a minimum value to a maximum value and then is decreased from the maximum value to the minimum value in one period; the output end of the motor pulse width modulator is connected with a first resistor; the base electrode of the transistor is connected with the motor pulse width modulator through the first resistor, a second resistor and a filter capacitor which are connected in parallel are connected between the base electrode and the emitting electrode, and the collector electrode of the transistor is connected with a third resistor and a fourth resistor which are connected in series. The buzzer control circuit can improve the tone quality of the buzzer under the condition of not improving the cost, so that the buzzer can emit pleasant chord tones.
Description
Technical Field
The invention belongs to the technical field of buzzers, and particularly relates to a buzzer control circuit and a buzzer device.
Background
The buzzer is an electronic buzzer with an integrated structure, adopts direct current voltage for power supply, and is widely applied to electronic products such as computers, printers, copiers, alarms, electronic toys, automobile electronic equipment, telephones, timers and the like as a sounding device. The buzzer has the biggest advantages of simple driving and low manufacturing cost. In a driving circuit of the common BUZZER, the BUZZER is output by the PWM of the singlechip, and the square wave is amplified through the switch, so that the BUZZER is driven to make a sound. However, the buzzer only emits harsh sounds, such as alarm sounds, and the like, with a single sound source.
A speaker, also called a "horn", is a very common electroacoustic transducer, different from a buzzer, and driven by a sine wave to emit various beautiful sounds. However, the speaker driving circuit is more complicated than the buzzer circuit, and a decoder, a memory scheme, a power amplifier circuit, and the like are required. Loudspeakers are therefore relatively expensive and are generally not suitable for sound sources for small appliances.
Disclosure of Invention
The purpose of the invention is realized by the following technical scheme.
The invention uses the motor pulse width modulator to adjust the input voltage signal of the square waveform into the waveform with periodically changed pulse width, and then the sine wave driving signal is obtained after the filtering by the capacitor, thereby leading the buzzer to emit soft chord sound.
In order to solve the above problem, a buzzer control circuit according to an embodiment of the first aspect of the present invention includes: the motor pulse width modulator is used for adjusting the square wave voltage signal into a waveform with periodically changed pulse width, and the pulse width of the waveform is firstly increased from a minimum value to a maximum value and then is decreased from the maximum value to the minimum value in one period; the output end of the motor pulse width modulator is connected with a first resistor; the base electrode of the transistor is connected with the motor pulse width modulator through the first resistor, a second resistor and a filter capacitor which are connected in parallel are connected between the base electrode and the emitting electrode, and the collector electrode of the transistor is connected with a third resistor and a fourth resistor which are connected in series.
The buzzer control circuit of the embodiment of the first aspect of the invention can improve the tone quality of the buzzer under the condition of not improving the cost, so that the buzzer can emit pleasant chord tones.
In some embodiments of the invention, further comprising: and the square wave power supply is used for generating a square wave voltage signal and inputting the square wave voltage signal to the motor pulse width modulator.
In some embodiments of the invention, the emitter of the transistor is grounded.
In some embodiments of the present invention, the filter module is a filter capacitor.
In some embodiments of the invention, the filtering module comprises a first capacitor and a second capacitor connected in parallel between the base and the emitter.
In some embodiments of the invention, the filter module comprises a filter capacitor and a fifth resistor connected in series between the base and the emitter.
In some embodiments of the present invention, the input voltage of the transistor is a sine wave after being filtered by the filtering module.
In some embodiments of the present invention, the transistor linearly amplifies an input sine wave. A buzzer device according to an embodiment of the second aspect of the present invention includes a buzzer and a buzzer control circuit, where the buzzer control circuit is the buzzer control circuit according to the embodiments of the first to third aspects of the present invention; the buzzer is bridged at two ends of the third resistor, the power supply end of the buzzer control circuit is connected with the power supply end of the buzzer, and the driving end of the buzzer control circuit is connected with the controlled end of the buzzer.
In some embodiments of the present invention, the controlled end input voltage of the buzzer is a sine wave.
The buzzer in the fourth aspect of the invention can improve the tone quality of the buzzer without increasing the cost, so that the buzzer can emit pleasant chord tones.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
figure 1 shows a schematic diagram of a buzzer control circuit in a first embodiment of the invention;
FIG. 2 is a waveform diagram of a voltage signal modulated by a motor pulse width modulator;
FIG. 3 illustrates a waveform of a voltage signal after capacitive filtering;
figure 4 shows a schematic diagram of a buzzer control circuit in a second embodiment of the invention;
figure 5 shows a schematic diagram of a buzzer control circuit in a third embodiment of the invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
The principle of the invention is as follows: the invention uses the motor pulse width modulator to adjust the input voltage signal of the square waveform into the waveform with periodically changed pulse width, and then the sine wave driving signal is obtained after the filtering by the capacitor, thereby leading the buzzer to emit soft chord sound. Various implementation examples of the present invention are illustrated below by three examples.
Example 1
As shown in fig. 1, a buzzer control circuit of the present invention includes:
the square wave power supply is used for generating a square wave voltage signal;
a Motor Pulse Width Modulator (represented by MPWM in fig. 1) having one end connected to a square wave power supply for modulating a square wave voltage signal into a waveform with a periodically varying Pulse Width, wherein the Pulse Width of the waveform is increased from a minimum value to a maximum value and then decreased from the maximum value to the minimum value in one period, as shown in fig. 2; the other end of the first resistor is connected with a first resistor R10;
a transistor Q2, the base of which is connected with the motor pulse width modulator through a first resistor R10, and a second resistor R11 and a filter capacitor C1 which are connected in parallel are connected between the base and the emitter, and the emitter is grounded; the collector is connected with a third resistor R12 and a fourth resistor R13 which are connected in series, and the buzzer BUZ is bridged at two ends of the third resistor R12. The power supply end of the buzzer control circuit is connected with the power supply end (12V direct current voltage source) of the buzzer BUZ, and the driving end of the buzzer control circuit is connected with the controlled end of the buzzer.
In terms of specific parameters, the resistance value of R10 is 51K ohm, the resistance value of R11 is 330 ohm, C1 is 104PF, the model of the transistor Q2 is an 8050 NPN transistor, the resistance value of R12 is 2K ohm, and the resistance value of R13 is 100 ohm.
The working principle of the embodiment is as follows:
the square wave signal output by the square wave power supply automatically changes the width of PWM after passing through the motor pulse width modulator, the output waveform is shown in figure 2, and then is filtered by a capacitor C1 to become a sine wave, as shown in figure 3. The resistances and types of R10, R11 and Q2 are selected by changing the driving amplifying circuit, so that the circuit is in linear amplification, the current Ic is Ib beta, the input sine wave is linearly amplified through the transistor Q2, and the buzzer BUZ is driven to sound.
Since all signals can be decomposed into sine wave combinations by FFT for a plurality of times, that is, the square waves applied to both sides of the buzzer in the prior art are actually equivalent to a plurality of sine wave combinations, the signals are relatively noisy to sound and are relatively harsh. The buzzer control circuit can adjust the driving voltage of the buzzer into a single sine wave under the condition of not increasing the cost, so that the tone quality of the buzzer can be improved, and the buzzer can emit pleasant chord tones.
Example 2
As shown in fig. 4, a buzzer control circuit of the present invention includes:
the square wave power supply is used for generating a square wave voltage signal;
a Motor Pulse Width Modulator (represented by MPWM in fig. 1) having one end connected to a square wave power supply for modulating a square wave voltage signal into a waveform with a periodically varying Pulse Width, wherein the Pulse Width of the waveform is increased from a minimum value to a maximum value and then decreased from the maximum value to the minimum value in one period, as shown in fig. 2; the other end of the first resistor is connected with a first resistor R10;
a transistor Q2, the base of which is connected with the motor pulse width modulator through a first resistor R10, and a second resistor R11, a first capacitor C1 and a second capacitor C2 which are connected in parallel are connected between the base and the emitter, and the emitter is grounded; the collector is connected with a third resistor R12 and a fourth resistor R13 which are connected in series, and the buzzer BUZ is bridged at two ends of the third resistor R12. The power supply end of the buzzer control circuit is connected with the power supply end (12V direct current voltage source) of the buzzer BUZ, and the driving end of the buzzer control circuit is connected with the controlled end of the buzzer.
In terms of specific parameters, the resistance value of R10 is 51K ohm, the resistance value of R11 is 330 ohm, C1 is 52PF, C2 is 52PF, the model of the transistor Q2 is an 8050 NPN transistor, the resistance value of R12 is 2K ohm, and the resistance value of R13 is 100 ohm.
The working principle of the embodiment is as follows:
the square wave signal output by the square wave power supply automatically changes the width of PWM after passing through the motor pulse width modulator, the output waveform is shown in figure 2, and then is filtered by capacitors C1 and C2 to become a sine wave, as shown in figure 3. The resistances and types of R10, R11 and Q2 are selected by changing the driving amplifying circuit, so that the circuit is in linear amplification, the current Ic is Ib beta, the input sine wave is linearly amplified through the transistor Q2, and the buzzer BUZ is driven to sound.
Since all signals can be decomposed into sine wave combinations by FFT for a plurality of times, that is, the square waves applied to both sides of the buzzer in the prior art are actually equivalent to a plurality of sine wave combinations, the signals are relatively noisy to sound and are relatively harsh. The buzzer control circuit can adjust the driving voltage of the buzzer into a single sine wave under the condition of not increasing the cost, so that the tone quality of the buzzer can be improved, and the buzzer can emit pleasant chord tones.
Example 3
As shown in fig. 5, a buzzer control circuit of the present invention includes:
the square wave power supply is used for generating a square wave voltage signal;
a Motor Pulse Width Modulator (represented by MPWM in fig. 1) having one end connected to a square wave power supply for modulating a square wave voltage signal into a waveform with a periodically varying Pulse Width, wherein the Pulse Width of the waveform is increased from a minimum value to a maximum value and then decreased from the maximum value to the minimum value in one period, as shown in fig. 2; the other end of the first resistor is connected with a first resistor R10;
a transistor Q2, the base of which is connected with the motor pulse width modulator through a first resistor R10, and a second resistor R11 and a filter capacitor C1 which are connected in parallel are connected between the base and the emitter, and the emitter is grounded; the collector is connected with a third resistor R12 and a fourth resistor R13 which are connected in series, and the buzzer BUZ is bridged at two ends of the third resistor R12. The power supply end of the buzzer control circuit is connected with the power supply end (12V direct current voltage source) of the buzzer BUZ, and the driving end of the buzzer control circuit is connected with the controlled end of the buzzer. In this embodiment, the filter capacitor C1 is further connected in series with a fifth resistor R14.
In terms of specific parameters, the resistance value of R10 is 51K ohm, the resistance value of R11 is 330 ohm, C1 is 104PF, the model of the transistor Q2 is an 8050 NPN transistor, the resistance value of R12 is 2K ohm, and the resistance value of R13 is 100 ohm. The resistance value of R14 was 200 ohms.
The working principle of the embodiment is as follows:
the square wave signal output by the square wave power supply automatically changes the width of PWM after passing through the motor pulse width modulator, the output waveform is shown in figure 2, and then is filtered by a capacitor C1 to become a sine wave, as shown in figure 3. The resistances and types of R10, R11 and Q2 are selected by changing the driving amplifying circuit, so that the circuit is in linear amplification, the current Ic is Ib beta, the input sine wave is linearly amplified through the transistor Q2, and the buzzer BUZ is driven to sound.
Since all signals can be decomposed into sine wave combinations by FFT for a plurality of times, that is, the square waves applied to both sides of the buzzer in the prior art are actually equivalent to a plurality of sine wave combinations, the signals are relatively noisy to sound and are relatively harsh. The buzzer control circuit can adjust the driving voltage of the buzzer into a single sine wave under the condition of not increasing the cost, so that the tone quality of the buzzer can be improved, and the buzzer can emit pleasant chord tones.
It should be noted that in the description of this specification, any process or method description in flow charts or otherwise described herein may be understood as representing modules, segments, or portions of code which include one or more executable instructions for implementing specific logical functions or steps of the process, and that the scope of the preferred embodiments of the present invention includes additional implementations in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the present invention.
The logic and/or steps represented in the flowcharts or otherwise described herein, e.g., an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (10)
1. A buzzer control circuit, comprising:
the motor pulse width modulator is used for adjusting the square wave voltage signal into a waveform with periodically changed pulse width, wherein the width of a plurality of pulses of the waveform in one period is increased from a minimum value to a maximum value and then is decreased from the maximum value to the minimum value; the output end of the motor pulse width modulator is connected with a first resistor;
the base electrode of the transistor is connected with the motor pulse width modulator through the first resistor, the second resistor and the filtering module which are connected in parallel are connected between the base electrode and the emitting electrode, and the collector electrode of the transistor is connected with the third resistor and the fourth resistor which are connected in series.
2. A buzzer control circuit in accordance with claim 1,
the filtering module is a filtering capacitor.
3. A buzzer control circuit in accordance with claim 1,
the filtering module comprises a first capacitor and a second capacitor which are connected in parallel between the base electrode and the emitter electrode.
4. A buzzer control circuit in accordance with claim 1,
the filtering module comprises a filtering capacitor and a fifth resistor which are connected between the base electrode and the emitter electrode in series.
5. The buzzer control circuit of claim 1,
after being filtered by the filtering module, the input voltage of the transistor is a sine wave.
6. The buzzer control circuit of claim 5,
the transistor linearly amplifies an input sine wave.
7. A buzzer control circuit according to any one of claims 1-6, characterised in that it further comprises:
and the square wave power supply is used for generating a square wave voltage signal and inputting the square wave voltage signal to the motor pulse width modulator.
8. A buzzer control circuit in accordance with any one of claims 1-6,
the emitter of the transistor is grounded.
9. A buzzer unit comprising a buzzer and a buzzer control circuit, said buzzer control circuit being a buzzer control circuit according to any one of claims 1 to 8; the buzzer is bridged at two ends of the third resistor, the power supply end of the buzzer control circuit is connected with the power supply end of the buzzer, and the driving end of the buzzer control circuit is connected with the controlled end of the buzzer.
10. The buzzer unit of claim 9,
the controlled end input voltage of the buzzer is sine wave.
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| CN201910804473.XA CN110689870A (en) | 2019-08-28 | 2019-08-28 | Buzzer control circuit and buzzer device |
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| CN201910804473.XA CN110689870A (en) | 2019-08-28 | 2019-08-28 | Buzzer control circuit and buzzer device |
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| CN110689870A true CN110689870A (en) | 2020-01-14 |
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Cited By (1)
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|---|---|---|---|---|
| CN111369960A (en) * | 2020-04-14 | 2020-07-03 | 深圳盈特创智能科技有限公司 | A buzzer driver circuit |
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