CN114141220A - Drive circuit of music passive buzzer - Google Patents
Drive circuit of music passive buzzer Download PDFInfo
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- CN114141220A CN114141220A CN202111431002.2A CN202111431002A CN114141220A CN 114141220 A CN114141220 A CN 114141220A CN 202111431002 A CN202111431002 A CN 202111431002A CN 114141220 A CN114141220 A CN 114141220A
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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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Abstract
The invention relates to a driving circuit of a music passive buzzer. In the circuit, a power supply module is connected with one end of a first driving module, the other end of the first driving module is connected with one end of a buzzer module and one end of an energy storage module, the other end of the energy storage module is grounded, the other end of the buzzer module is connected with one end of a second driving module, the other end of the second driving module is grounded, a first control end of a control module is connected with a control end of the first driving module, and a second control end of the control module is connected with a control end of the second driving module; the control module controls the first driving module and the second driving module to be switched on or switched off, and the energy storage module is charged or discharged according to the switching on or switching off of the driving modules, so that the working voltage loaded on the buzzer module is changed; the buzzer module generates different sounds according to the change of the working voltage. On the basis of ensuring the sound production diversity and novelty of the buzzer, the driving circuit has the characteristics of simplicity and low cost.
Description
Technical Field
The invention relates to the field of drive control, in particular to a drive circuit of a music passive buzzer.
Background
Most buzzers on the market are divided into two types from the aspect of driving modes, namely active driving and passive driving, the active buzzers are also called direct current buzzers, a multivibrator is already contained in the active buzzers, sound can be produced as long as rated direct current voltage is applied to two ends, and the active buzzers have the characteristics of simple driving and control, but the price is slightly higher. The passive buzzer is also called an alternating current buzzer, an oscillator is not arranged in the passive buzzer, square wave voltage with specific frequency (note that the square wave voltage is not alternating current, namely no negative voltage) is required to be applied to two ends of the passive buzzer to sound, and the passive buzzer has the characteristics of reliability, low cost, adjustable sound frequency and the like.
However, in the conventional passive buzzer driving circuit, the sounding of the buzzer is relatively single, and the conventional passive buzzer driving circuit is not novel, and cannot meet the requirement of the existing customer on personalized sound change. If a music chip is used for adding the output of a power amplifier loudspeaker, the circuit design is complex and the cost is quite high.
Disclosure of Invention
The invention aims to provide a driving circuit of a music passive buzzer, which has the characteristics of simplicity and low cost on the basis of ensuring the sound production diversity and novelty of the buzzer.
In order to achieve the purpose, the invention provides the following scheme:
a driving circuit of a music passive buzzer, comprising: the device comprises a power supply module, an energy storage module, a first driving module, a second driving module, a buzzer module and a control module;
the power supply module is connected with one end of the first driving module, the other end of the first driving module is respectively connected with one end of the buzzer module and one end of the energy storage module, the other end of the energy storage module is grounded, the other end of the buzzer module is connected with one end of the second driving module, the other end of the second driving module is grounded, the first control end of the control module is connected with the control end of the first driving module, and the second control end of the control module is connected with the control end of the second driving module; the first control end and the second control end output different PWM signals;
the control module controls the first driving module and the second driving module to be switched on or off according to the output PWM signal, and then the energy storage module carries out charging or discharging according to the switching on or off of the first driving module and the second driving module; the charging or discharging of the energy storage module changes the working voltage loaded on the buzzer module; the buzzer module generates different sounds according to the change of the working voltage.
Optionally, the power supply module is a 5V power supply.
Optionally, the energy storage module comprises: a resistor R16 and a capacitor C12;
one end of the resistor R16 is connected with one end of the buzzer module and one end of the first driving module, the other end of the resistor R16 is connected with one end of the capacitor C12, and the other end of the capacitor C12 is grounded.
Optionally, the first driving module comprises: a resistor R20, a resistor R22 and a triode Q2;
the one end of resistance R20 with control module's first control end is connected, the other end of resistance R20 respectively with resistance R22's one end and triode Q2's base are connected, triode Q2's projecting pole with the buzzer module with the energy storage module is connected, triode Q2's collecting electrode and resistance R22's the other end with power module connects.
Optionally, the second driving module comprises: a resistor R19, a resistor R21 and a triode Q1;
one end of the resistor R19 is connected with the second control end of the control module, the other end of the resistor R19 is connected with one end of the resistor R21 and the base of the triode Q1, the emitter of the triode Q1 is connected with the buzzer module, the collector of the triode Q1 and the other end of the resistor R21 are grounded.
Optionally, the buzzer module comprises: a resistor R18, a resistor R17 and a buzzer;
one end of the resistor R18 is connected with the second driving module, the other end of the resistor R18 is connected with one end of the resistor R17 and one end of the buzzer respectively, and the other end of the resistor R17 and the other end of the buzzer are connected with the first driving module and the energy storage module respectively.
Optionally, the control module is a single chip microcomputer.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
according to the driving circuit of the music passive buzzer, the energy storage module is charged or discharged according to the conduction or the closing of the two driving modules, so that the working voltage loaded on the buzzer module is changed; the buzzer module generates different sounds according to the change of the working voltage. On the basis of ensuring the sound production diversity and novelty of the buzzer, the driving circuit has the characteristics of simplicity and low cost. And can be used for prompting requirements of different products on startup and shutdown, key action and other sounds.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of a driving circuit of a music passive buzzer provided by the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention aims to provide a driving circuit of a music passive buzzer, which has the characteristics of simplicity and low cost on the basis of ensuring the sound production diversity and novelty of the buzzer.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
Fig. 1 is a schematic structural diagram of a driving circuit of a music passive buzzer provided by the present invention, and as shown in fig. 1, the driving circuit of the music passive buzzer provided by the present invention includes: the device comprises a power supply module 1, an energy storage module 2, a first driving module 3, a second driving module 4, a buzzer module 5 and a control module;
the power supply module 1 is connected with one end of the first driving module 3, the other end of the first driving module 3 is respectively connected with one end of the buzzer module 5 and one end of the energy storage module 2, the other end of the energy storage module 2 is grounded, the other end of the buzzer module 5 is connected with one end of the second driving module 4, the other end of the second driving module 4 is grounded, a first control end of the control module is connected with a control end of the first driving module 3, and a second control end of the control module is connected with a control end of the second driving module 4; the PWM signals output by the first control end and the second control end are different
The control module controls the first driving module 3 and the second driving module 4 to be switched on or off according to the output PWM signal, and then the energy storage module 2 is charged or discharged according to the switching on or off of the first driving module 3 and the second driving module 4; the charging or discharging of the energy storage module 2 changes the working voltage loaded on the buzzer module 5; the buzzer module 5 generates different sounds according to the change of the working voltage.
As a specific embodiment, the power supply module 1 is a 5V power supply.
As shown in fig. 1, the energy storage module 2 includes: a resistor R16 and a capacitor C12;
one end of the resistor R16 is connected to one end of the buzzer module 5 and one end of the first driving module 3, the other end of the resistor R16 is connected to one end of the capacitor C12, and the other end of the capacitor C12 is grounded.
The first drive module 3 includes: a resistor R20, a resistor R22 and a triode Q2;
one end of the resistor R20 is connected with the first control end of the control module, the other end of the resistor R20 is connected with one end of the resistor R22 and the base of the triode Q2, the emitter of the triode Q2 is connected with the buzzer module 5 and the energy storage module 2, the collector of the triode Q2 and the other end of the resistor R22 are connected with the power supply module 1.
The second drive module 4 includes: a resistor R19, a resistor R21 and a triode Q1;
one end of the resistor R19 is connected with the second control end of the control module, the other end of the resistor R19 is connected with one end of the resistor R21 and the base of the triode Q1, the emitter of the triode Q1 is connected with the buzzer module 5, and the collector of the triode Q1 and the other end of the resistor R21 are grounded.
The buzzer module 5 comprises: a resistor R18, a resistor R17 and a buzzer;
one end of the resistor R18 is connected with the second driving module 4, the other end of the resistor R18 is connected with one end of the resistor R17 and one end of the buzzer respectively, and the other end of the resistor R17 and the other end of the buzzer are connected with the first driving module 3 and the energy storage module 2 respectively.
The control module is a single chip microcomputer.
Wherein, R19 and R20 are base current limiting resistors of triodes Q1 and Q2. R21 is the pull-down resistor of transistor Q1 base, and R22 is the pull-up resistor of transistor Q2 to guarantee the off state of transistor Q1 and Q2. R18 is a buzzer discharge resistor, COM1 is a buzzer, and R17 is an impedance matching resistor of the buzzer. R16 is a charging resistor and provides energy for the C12 energy storage device.
When the first control end Buzzer _ EN2 outputs a PWM signal to the low-frequency port to drive the triode Q2, the triode Q2 is conducted, 5V voltage provides working voltage for the passive Buzzer through the Q2 triode, and meanwhile, the capacitor C12 is charged; in the process of changing the Buzzer voltage from low to high, when the level of the Buzzer _ EN2 port becomes high, the Q2 triode is cut off. The second control terminal Buzzer _ EN1 high frequency port outputs PWM signal to turn on or off the transistor Q1. The buzzer discharges through the energy storage devices C12, R16 and R18, and the volume of the passive buzzer can be changed in the discharging process to generate required music sound.
As a specific embodiment, two ports of the Buzzer _ EN1 and the Buzzer _ EN2 are connected with an I/O port of a singlechip or a passive Buzzer driving port of the singlechip.
The Buzzer _ EN1 port is called a high-frequency port (compared with Buzzer _ EN 2), the frequency of the pulse voltage is generally a few KHz, and the specific frequency is adjusted according to the music sound required to be emitted by the passive Buzzer.
The Buzzer _ EN2 port is a "low frequency port" with a relatively long voltage period, typically tens to hundreds of ms.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The principles and embodiments of the present invention have been described herein using specific examples, which are provided only to help understand the method and the core concept of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (7)
1. A drive circuit of a music passive buzzer is characterized by comprising: the device comprises a power supply module, an energy storage module, a first driving module, a second driving module, a buzzer module and a control module;
the power supply module is connected with one end of the first driving module, the other end of the first driving module is respectively connected with one end of the buzzer module and one end of the energy storage module, the other end of the energy storage module is grounded, the other end of the buzzer module is connected with one end of the second driving module, the other end of the second driving module is grounded, the first control end of the control module is connected with the control end of the first driving module, and the second control end of the control module is connected with the control end of the second driving module; the first control end and the second control end output different PWM signals;
the control module controls the first driving module and the second driving module to be switched on or off according to the output PWM signal, and then the energy storage module carries out charging or discharging according to the switching on or off of the first driving module and the second driving module; the charging or discharging of the energy storage module changes the working voltage loaded on the buzzer module; the buzzer module generates different sounds according to the change of the working voltage.
2. The driving circuit of a music passive buzzer according to claim 1, wherein the power supply module is a 5V power supply.
3. The driving circuit of a music passive buzzer according to claim 1, wherein the energy storage module comprises: a resistor R16 and a capacitor C12;
one end of the resistor R16 is connected with one end of the buzzer module and one end of the first driving module, the other end of the resistor R16 is connected with one end of the capacitor C12, and the other end of the capacitor C12 is grounded.
4. The driving circuit of a music passive buzzer according to claim 1, wherein the first driving module comprises: a resistor R20, a resistor R22 and a triode Q2;
the one end of resistance R20 with control module's first control end is connected, the other end of resistance R20 respectively with resistance R22's one end and triode Q2's base are connected, triode Q2's projecting pole with the buzzer module with the energy storage module is connected, triode Q2's collecting electrode and resistance R22's the other end with power module connects.
5. The driving circuit of a music passive buzzer according to claim 1, wherein the second driving module comprises: a resistor R19, a resistor R21 and a triode Q1;
one end of the resistor R19 is connected with the second control end of the control module, the other end of the resistor R19 is connected with one end of the resistor R21 and the base of the triode Q1, the emitter of the triode Q1 is connected with the buzzer module, the collector of the triode Q1 and the other end of the resistor R21 are grounded.
6. The driving circuit of a musical passive buzzer according to claim 1, wherein the buzzer module includes: a resistor R18, a resistor R17 and a buzzer;
one end of the resistor R18 is connected with the second driving module, the other end of the resistor R18 is connected with one end of the resistor R17 and one end of the buzzer respectively, and the other end of the resistor R17 and the other end of the buzzer are connected with the first driving module and the energy storage module respectively.
7. The driving circuit of the music passive buzzer according to claim 1, wherein the control module is a single chip microcomputer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111431002.2A CN114141220A (en) | 2021-11-29 | 2021-11-29 | Drive circuit of music passive buzzer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111431002.2A CN114141220A (en) | 2021-11-29 | 2021-11-29 | Drive circuit of music passive buzzer |
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| CN114141220A true CN114141220A (en) | 2022-03-04 |
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| CN202111431002.2A Pending CN114141220A (en) | 2021-11-29 | 2021-11-29 | Drive circuit of music passive buzzer |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000278060A (en) * | 1999-03-25 | 2000-10-06 | Matsushita Graphic Communication Systems Inc | Method for tone volume adjustment and tone source drive circuit |
| CN102014330A (en) * | 2009-09-04 | 2011-04-13 | 樱花卫厨（中国）股份有限公司 | Music buzzing control circuit for range hood |
| CN206819728U (en) * | 2017-06-07 | 2017-12-29 | 深圳市英唐智能科技有限公司 | A kind of multiple tone buzzer circuit |
| CN108022579A (en) * | 2018-01-16 | 2018-05-11 | 深圳和而泰小家电智能科技有限公司 | Sounding regulating device, adjusting method and the household electrical appliance of a kind of buzzer |
| CN112133272A (en) * | 2020-09-24 | 2020-12-25 | 华帝股份有限公司 | Self-excited oscillation buzzer tail sound drive circuit and kitchen appliance |
| CN112365869A (en) * | 2020-10-09 | 2021-02-12 | 华帝股份有限公司 | Single IO controlled buzzer circuit and control method thereof |
-
2021
- 2021-11-29 CN CN202111431002.2A patent/CN114141220A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000278060A (en) * | 1999-03-25 | 2000-10-06 | Matsushita Graphic Communication Systems Inc | Method for tone volume adjustment and tone source drive circuit |
| CN102014330A (en) * | 2009-09-04 | 2011-04-13 | 樱花卫厨（中国）股份有限公司 | Music buzzing control circuit for range hood |
| CN206819728U (en) * | 2017-06-07 | 2017-12-29 | 深圳市英唐智能科技有限公司 | A kind of multiple tone buzzer circuit |
| CN108022579A (en) * | 2018-01-16 | 2018-05-11 | 深圳和而泰小家电智能科技有限公司 | Sounding regulating device, adjusting method and the household electrical appliance of a kind of buzzer |
| CN112133272A (en) * | 2020-09-24 | 2020-12-25 | 华帝股份有限公司 | Self-excited oscillation buzzer tail sound drive circuit and kitchen appliance |
| CN112365869A (en) * | 2020-10-09 | 2021-02-12 | 华帝股份有限公司 | Single IO controlled buzzer circuit and control method thereof |
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