CN106531140A - Piezoelectric buzzer drive circuit - Google Patents
Piezoelectric buzzer drive circuit Download PDFInfo
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- CN106531140A CN106531140A CN201611102144.3A CN201611102144A CN106531140A CN 106531140 A CN106531140 A CN 106531140A CN 201611102144 A CN201611102144 A CN 201611102144A CN 106531140 A CN106531140 A CN 106531140A
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- 230000003534 oscillatory effect Effects 0.000 claims description 17
- 239000013078 crystal Substances 0.000 claims description 6
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- 230000005611 electricity Effects 0.000 claims description 5
- 239000000126 substance Substances 0.000 claims description 4
- 239000004065 semiconductor Substances 0.000 claims description 3
- 230000000087 stabilizing effect Effects 0.000 claims description 3
- 230000008878 coupling Effects 0.000 claims description 2
- 238000010168 coupling process Methods 0.000 claims description 2
- 238000005859 coupling reaction Methods 0.000 claims description 2
- 230000009466 transformation Effects 0.000 claims 1
- 230000006641 stabilisation Effects 0.000 abstract 2
- 238000011105 stabilization Methods 0.000 abstract 2
- 239000003990 capacitor Substances 0.000 abstract 1
- 238000007599 discharging Methods 0.000 abstract 1
- 239000002184 metal Substances 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 2
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- 230000002045 lasting effect Effects 0.000 description 2
- 241000256844 Apis mellifera Species 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 235000015170 shellfish Nutrition 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
Classifications
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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
- G10K9/122—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers electrically operated using piezoelectric driving means
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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Abstract
The invention discloses a piezoelectric buzzer drive circuit, which includes an enabling control module, a stabilization module, a vibration control module and a boost drive module which are connected in sequence; enabling control module includes a transistor Q1 and a transistor Q2, the stabilization module includes a transistor Q3, the vibration control module includes a transistor Q4, and the boost drive module includes a transformer L1 and a piezoelectric buzzer B1; when the transistor Q1 is switched on, the transistor Q2 is controlled to be switched on and the transistor Q3 is controlled to be cut off, when the transistor Q2 is switched on, the transistor Q4 is controlled to be switched on, and the vibration control module works; after the vibration control module works, during charging and discharging of a capacitor C1, the state of the transistor Q4 is switched between switching-on and cutoff, thereby enabling a primary coil of the transformer L1 to ceaselessly vibrate, and the piezoelectric buzzer B1 produces continuous high-decibel buzzing; and when piezoelectric buzzer B1 does not work, current consumption of the transistors Q1, Q2, Q3 and Q4 is extremely low, so that the standby power consumption of the whole drive circuit is extremely low and the drive circuit is relatively energy-saving.
Description
Technical field
The application is related to buzzer field, more particularly to a kind of piezo buzzer drive circuit.
Background technology
Piezo buzzer is sheet metal is vibrated and sounding by the potsherd of piezo-electric effect, typically by high pressure extreme pressure
Piezoelectric ceramic piece afterwards is sticked on vibration sheet metal, after alternating voltage is applied, and piezoelectric ceramic piece occurs machine because of piezo-electric effect
Tool deforms, and occurs stretching or shrinkage phenomenon, causes sheet metal vibration using this characteristic and sends the sound.Piezo buzzer belongs to
Capacitive load device, DC impedance are infinitely great, and AC impedance is also larger, need higher driving voltage, but drive electricity during driving
Stream is less, typically in 10mA or so.
Current piezo buzzer drive circuit needs higher voltage, generally requires in the system of low voltage power supply
Using special booster power chip and special driving integrated chip.Such piezo buzzer drive circuit receives integrated core
The restriction of piece, the sound decibel number of output are low；Input and output pressure reduction is big, and loss power consumption is big, and quiescent dissipation is high, not energy-conservation.
The relatively costly high cost of such piezo buzzer drive circuit, and in battery power supply system, have a strong impact on battery
In the life-span, shorten the life cycle of product, it is impossible to need the alarm of longer life (such as only in cost sensitivity, low-power consumption, battery
Vertical smoke alarm) in widely use,
The content of the invention
The application provides a kind of piezo buzzer drive circuit, and high-decibel piezoelectric type is realized in low voltage power supply system
Buzzer drive circuit, this drive circuit quiescent dissipation is low, low cost, and can be widely used in battery needs the warning of longer life
In device.
The piezo buzzer drive circuit that the application is provided, including：What is be sequentially connected makes energy control module, stable mode
Block, vibrational control module and boosting drive module；
It is described to make energy control module include transistor Q1 and transistor Q2, first electrode and the crystalline substance of the transistor Q1
Body pipe Q2 control poles are connected, and control pole is connected with the input of the piezo buzzer drive circuit, outer for receiving
Portion enables control signal；According to the outside enable control signal, the transistor Q1 controls the transistor Q2 cut-offs or leads
It is logical, when the transistor Q1 ends, the transistor Q2 cut-offs, when the transistor Q1 is turned on, the transistor Q2 leads
It is logical；
The stable module provides stable control signal for the vibrational control module, and which includes transistor Q3, described
The control pole of transistor Q3 is connected with the first electrode of the transistor Q1；The transistor Q1 is controlled according to outside the enable
Signal processed controls the transistor Q3 cut-offs or turns on, when the transistor Q1 ends, the transistor Q3 conductings, when described
When transistor Q1 is turned on, the transistor Q3 cut-offs；
The vibrational control module includes transistor Q4 and electric capacity C1, control pole and the transistor of the transistor Q4
The first electrode of Q2 is connected with the first electrode of the transistor Q3；When the transistor Q2 is turned on, the transistor Q2
The transistor Q4 conductings are controlled, the vibrational control module works, when the transistor Q3 is turned on, the transistor Q3 controls
The transistor Q4 cut-offs are made, the vibrational control module does not work；One end of the electric capacity C1 connect the stable module and
The control pole of the transistor Q4, the other end connect the boosting drive module；
The boosting drive module includes transformer L1 and piezoelectric buzzer B1, the primary coil of the transformer L1 and institute
The first electrode for stating transistor Q4 is connected, the secondary coil of the transformer L1 and first pins of piezoelectric buzzer B1 and
Second pin is in parallel；When the electric capacity C1 is charged or discharges, transistor Q4 is realized described on or off switching state
The vibrational control module control boosting drive module work so that the primary coil of the transformer L1 ceaselessly vibrates, institute
Piezoelectric buzzer B1 is stated because piezo-electric effect is sounded a buzzer.
In certain embodiments, the 3rd pin of the piezoelectric buzzer B1 is also connected with the electric capacity C1, by piezoelectricity
The oscillatory feedback signal output of buzzer B1 makes the transistor Q4 cut-offs, vibration to the electric capacity C1, the electric capacity C1 electric discharges
Feedback signal BEEP_F is high level, and when the transistor Q4 is turned on, oscillatory feedback signal BEEP_F is low level, the electric capacity
C1 charges.
In certain embodiments, when the vibrational control module starts, the transistor Q4 first time conducting states so that
The boosting drive module starts, and now, oscillatory feedback signal BEEP_F is first low level, and the electric capacity C1 sparks and makes crystalline substance
Body pipe Q4 ends, and the oscillatory feedback signal BEEP_F is changed into high level, after the electric capacity C1 electric discharges terminate, the transistor Q4
It is changed into conducting state by the control of the transistor Q2, the oscillatory feedback signal BEEP_F is changed into low level again.
In certain embodiments, the stable module also includes diode D1, the diode D1 and the transistor Q3
Parallel connection, is Zener diode, for voltage stabilizing is carried out to oscillatory feedback signal BEEP_F, protects the transistor Q3.
In certain embodiments, the vibrational control module also includes diode D2, the diode D2 and the crystal
Pipe Q4 is in parallel, is Zener diode, when the vibrational control module works, the transistor Q4 is protected.
In certain embodiments, the first electrode of the transistor Q3 is also connected with the first electrode of the transistor Q2
Connect, when the transistor Q2 turn on, in saturation state when, provide power supply for the stable module.
In certain embodiments, the transformer L1 is auto-transformer.
In certain embodiments, changing the no-load voltage ratio design of the transformer L1, to obtain can secondary coil higher electronic
Gesture, the piezoelectric buzzer B1 send high-decibel buzzer.
In certain embodiments, the operation principle of the transistor Q3 is controlled for voltage.
In certain embodiments, the transistor Q1, transistor Q2, transistor Q3 and transistor Q4 include bipolar transistor
Pipe or metal-oxide-semiconductor.
The beneficial effect of the application is：The application provide piezo buzzer drive circuit due to by transistor Q1,
Between transistor Q2, transistor Q3 and transistor Q4 these triodes, cleverly circuit connection is sent controlling piezoelectric buzzer B1
Or stop sounding a buzzer, when piezoelectric buzzer B1 does not work, transistor Q1, transistor Q2, transistor Q3 and transistor Q4
Current drain it is extremely low so that piezo buzzer drive circuit stand-by power consumption is extremely low, more energy efficient；Additionally, due to being become using self coupling
Depressor, can make secondary coil obtain higher electromotive force by changing the no-load voltage ratio design of transformer L1, and piezoelectric buzzer B1 sends
High-decibel buzzer, so as to high-decibel piezo buzzer drive circuit is realized in low voltage power supply system, can be extensive
Using in the alarm that battery needs longer life.
Description of the drawings
The piezo buzzer driving circuit structure block diagram that Fig. 1 is provided for the application；
A kind of piezo buzzer drive circuit schematic diagram that Fig. 2 is provided for the embodiment of the present application.
Specific embodiment
Embodiment one：
Fig. 1 and Fig. 2 is refer to, the application provides a kind of piezo buzzer drive circuit, and the piezo buzzer drives
Circuit includes that what is be sequentially connected makes energy control module 1, stable module 2, vibrational control module 3 and boosting drive module 4.
Energy control module 1 is made to include transistor Q1, transistor Q2 and the resistance R1 for playing metering function, resistance R2, resistance
R3, resistance R4 and resistance R5, transistor Q1 and transistor Q2 are bipolar transistor.Resistance R1 is connected to piezo buzzer drive
Between the input EN and transistor Q1 base stages B of dynamic circuit, transistor Q1 receives outside enable control signal by resistance R1.Electricity
Resistance R2 is connected between transistor Q1 emitter Es and transistor Q1 base stages B, wherein, transistor Q1 emitter Es ground connection.Resistance R3
It is connected with transistor Q1 colelctor electrode C, transistor Q1 is connected with stable module 2 by resistance R3.Resistance R4 is connected to crystal
Between pipe Q1 colelctor electrodes C and transistor Q2 base stages B, control signal is enabled according to outside, transistor Q1 is brilliant by resistance R2 controls
Body pipe Q2 ends or turns on, when transistor Q1 ends, transistor Q2 cut-offs；When transistor Q1 is turned on, transistor Q2 conductings.
Resistance R5 is connected between transistor Q2 emitter Es and transistor Q2 colelctor electrode C, and transistor Q2 emitter Es meet power supply VCC, brilliant
Body pipe Q2 colelctor electrodes C is also connected with stable module 2, when transistor Q2 turn on, in saturation state when, be that stable module 2 is carried
Power supply source.
Stable module 2 includes transistor Q3, plays the resistance R6 and Zener diode D1 of metering function.Transistor Q3 is NMOS
Pipe, transistor Q3 grids G are connected with transistor Q1 colelctor electrode C by resistance R3, and transistor Q1 enables control letter according to outside
The cut-off of number controlling transistor Q3 is turned on, and when transistor Q1 end, transistor Q3 is turned on, when transistor Q1 is turned on, crystal
Pipe Q3 ends；Transistor Q3 drain Ds are connected with resistance R6；Transistor Q3 source Ss are grounded.Wherein, one end connection of resistance R6
Transistor Q2, other end connection transistor Q3 and vibrational control module 3 so that the drain D of transistor Q3 and vibrational control module 3
It is connected.Therefore, drain Ds of the transistor Q2 by resistance R6 controlling transistors Q3, when transistor Q2 is turned on, transistor Q3's
Drain D is high level；By the drain D of transistor Q3, stable module 2 provides stable control signal for vibrational control module 3.
Zener diode D1 is in parallel with the drain D and source S of transistor Q3, for carrying out voltage stabilizing to oscillatory feedback signal BEEP_F, protects
Shield transistor Q3.
Vibrational control module 3 includes transistor Q4, electric capacity C1, the resistance R7 and Zener diode D2 that play metering function.It is brilliant
Body pipe Q4 is NMOS tube, the grid G of transistor Q4 drain D respectively with transistor Q3, the above-mentioned resistance R6 other ends and electric capacity C1
It is connected, when transistor Q2 is turned on, transistor Q2 is turned on by resistance R6 controlling transistors Q4, and vibrational control module 3 works,
When transistor Q3 is turned on, i.e. the drain D of transistor Q3 exports stable low level, so that transistor Q4 cut-offs, vibration
Control module 3 does not work；The source S ground connection of transistor Q4；The drain D of transistor Q4 is connected with boosting drive module 4, is controlled
Boosting drive module 4 works.Resistance R7 two ends connect electric capacity C1 and power supply VCC respectively.Zener diode D2 and transistor Q4's
Drain D and source S are in parallel, when vibrational control module 3 works, transistor Q4 are protected.One end connection of electric capacity C1 is steady
Cover half block 2 and transistor Q4, other end connection resistance R7 and boosting drive module 4, receive the vibration from boosting drive module 4
Feedback signal BEEP_F.
Boosting drive module 4 is controlled by vibrational control module 3, including transformer L1 and piezoelectric buzzer B1.Transformer L1
Primary coil be connected with transistor Q4 and power supply VCC, the secondary coil of transformer L1 and piezoelectric buzzer B1 the first pin M
It is in parallel with second pin S, when transistor Q4 is turned on, control boosting drive module 4 is started working, so that transformer L1
Primary coil vibrates, and piezoelectric buzzer B1 sounds a buzzer because of piezo-electric effect.The 3rd pin F of piezoelectric buzzer B1 also with electric capacity
C1 is connected, by the oscillatory feedback signal output of piezoelectric buzzer B1 to electric capacity C1.Transformer L1 is auto-transformer (three ends electricity
Sense), the no-load voltage ratio design for changing transformer L1 can make secondary coil obtain higher electromotive force, so that piezoelectric buzzer B1 sends
High-decibel buzzer.
Electric capacity C1 electric discharges end transistor Q4, and oscillatory feedback signal BEEP_F is high level；When transistor Q4 is turned on, shake
Feedback signal BEEP_F is swung for low level, electric capacity C1 chargings.Electric capacity C1 is charged or discharges, and the control of vibrational control module 3 rises
Pressure drive module 4 works so that the primary coil of transformer L1 ceaselessly vibrates, and piezoelectric buzzer B1 sends height because of piezo-electric effect
Decibel buzzer.
According to above-mentioned piezo buzzer drive circuit, when needing piezoelectric buzzer B1 to sound a buzzer, which controlled
Cheng Wei：
(1) transistor Q1 base stages B receive outside enable control signal from input EN, are changed into high level, and transistor Q1 leads
Logical, transistor Q1 colelctor electrodes C is low level, and transistor Q2 base stages B are low level so that transistor Q2 is turned on, transistor Q2 collection
Electrode C is high level；
(2) transistor Q1 colelctor electrodes C be low level, NMOS tube Q3 grid G be low level, NMOS tube Q3 cut-off；
(3) transistor Q2 colelctor electrodes C is high level, and NMOS tube Q3 drain D is high level so that NMOS tube Q4 grid G is
High level, the conducting of NMOS tube Q4, vibrational control module 3 start；
(4) NMOS tube Q4 is turned on for the first time so that boosting drive module 4 starts so that piezoelectric buzzer B1 sends high score
Shellfish buzzer.
It is noted that when transistor Q4 conductings for the first time cause boosting drive module 4 to start, oscillatory feedback signal
BEEP_F is first low level, and electric capacity C1 sparks makes transistor Q4 be changed into cut-off state, and oscillatory feedback signal BEEP_F is changed into
High level, after electric capacity C1 electric discharges terminate, transistor Q4 is changed into conducting state, oscillatory feedback signal again by the control of transistor Q2
BEEP_F is changed into low level again.
After vibrational control module 3 starts, during the discharge and recharge of electric capacity C1, NMOS tube Q4 on or off switching state, from
And the ceaselessly vibration of the primary coil of transformer L1 is made, piezoelectric buzzer B1 sends lasting high-decibel buzzer.
According to above-mentioned piezo buzzer drive circuit, when needing piezoelectric buzzer B1 to stop sounding a buzzer, its control
Process processed is：
(1) transistor Q1 base stages B receive outside enable control signal from input EN, are changed into low level, and transistor Q1 cuts
Only, transistor Q1 colelctor electrodes C is high level, and transistor Q2 base stages B are high level so that transistor Q2 ends；
(2) transistor Q1 colelctor electrodes C be high level, NMOS tube Q3 grid G be high level, NMOS tube Q3 conducting, NMOS tube
Q3 drain Ds are stable low level；
(3) NMOS tube Q3 drain D is stable low level so that NMOS tube Q4 grid G is also stable low level, NMOS
Pipe Q4 ends, and vibrational control module 3 quits work；
(4) vibrational control module 3 quits work so that boosting drive module 4 also quits work, and piezoelectric buzzer B1 stops
Sound a buzzer.
When piezoelectric buzzer B1 does not sound a buzzer, transistor Q1, transistor Q2 and these triodes of NMOS tube Q4 are equal
For cut-off, energy control module 1, vibrational control module 2 and boosting drive module 4 almost no current drain is made；Stable module 3
NMOS tube Q3 is while in conducting state, but the operation principle of NMOS tube Q3 is voltage control, so stable module 3 is also almost
Without current drain, and as stable module 2 is controlled using NMOS tube, quiescent dissipation is low, therefore, the piezoelectric type honeybee of the application
Ring device drive circuit has extremely low stand-by power consumption.
Embodiment two：
Transistor Q1, transistor Q2 in embodiment one could alternatively be other transistors of identical operation principle, such as
Metal-oxide-semiconductor.
Embodiment three：
Transistor Q3, transistor Q4 in embodiment one could alternatively be other crystal of identical operation principle, pipe, such as
Bipolar transistor.
Example IV：
On the premise of volume, cost, efficiency is not considered, the transformer L1 in embodiment one could alternatively be common change
Depressor.
Cleverly circuit connection is capable of achieving the piezo buzzer drive circuit provided due to the application：Lead in transistor Q1
When logical, the conducting of controlling transistor Q2 and transistor Q3 end, transistor Q2 conducting controlling transistor Q4 conductings, vibrational control module
Work；Vibrational control module work after, during the discharge and recharge of electric capacity C1, transistor Q4 on or off switching state so that
The ceaselessly vibration of the primary coil of transformer L1, piezoelectric buzzer B1 send lasting high-decibel buzzer；Transistor Q1 cuts
Only, the cut-off of controlling transistor Q2 and transistor Q3 conductings, transistor Q3 conductings, transistor Q3 drain Ds export stable low level,
So that NMOS tube Q4 grid G is also stable low level, and control NMOS tube Q4 cut-off, vibrational control module from service, then make
Drive module of must boosting 4 also quits work, and piezoelectric buzzer B1 stops sounding a buzzer.
In sum, the piezo buzzer drive circuit that the application is provided is due to by transistor Q1, transistor Q2, crystalline substance
Between body pipe Q3 and transistor Q4 these triodes cleverly circuit connection controlling piezoelectric buzzer B1 and send or stop sending
Buzzer, when piezoelectric buzzer B1 does not work, the current drain of transistor Q1, transistor Q2, transistor Q3 and transistor Q4
It is extremely low so that piezo buzzer drive circuit stand-by power consumption is extremely low, more energy efficient；Additionally, due to auto-transformer is adopted, pass through
The no-load voltage ratio design for changing transformer L1 can make secondary coil obtain higher electromotive force, and piezoelectric buzzer B1 sends high-decibel buzzing
Sound, so as to high-decibel piezo buzzer drive circuit is realized in low voltage power supply system, can be widely used in battery
In needing the alarm of longer life.
Transistor used in the embodiment of the present application can be the transistor of any structure, such as field-effect transistor (FET,
Field Effect Transistor), or bipolar transistor (BJT, Bipolar Junction Transistor).When
When transistor is FET, control pole finger grid, first electrode refer to drain electrode, second electrode finger source electrode；When transistor is BJT, control
Pole refers to base stage, and first electrode refers to colelctor electrode, and second electrode refers to emitter stage.When transistor is used as switch, which drains and source
Extremely can be interchangeable according to actually used transistor types (such as p-type or N-type).
Above content is the further description made to the application with reference to specific embodiment, it is impossible to assert this Shen
Being embodied as please is confined to these explanations.For the application person of an ordinary skill in the technical field, do not taking off
On the premise of conceiving from the present application, some simple deduction or replace can also be made.
Claims (10)
1. a kind of piezo buzzer drive circuit, it is characterised in that include：What is be sequentially connected makes energy control module, stable mode
Block, vibrational control module and boosting drive module；
It is described to make energy control module include transistor Q1 and transistor Q2, first electrode and the transistor of the transistor Q1
Q2 control poles are connected, and control pole is connected with the input of the piezo buzzer drive circuit, is made for receiving outside
Can control signal；According to the outside enable control signal, the transistor Q1 controls the transistor Q2 cut-offs or turns on, when
When the transistor Q1 ends, the transistor Q2 cut-offs, when the transistor Q1 is turned on, the transistor Q2 conductings；
The stable module provides stable control signal for the vibrational control module, and which includes transistor Q3, the crystal
The control pole of pipe Q3 is connected with the first electrode of the transistor Q1；The transistor Q1 controls letter according to outside the enable
Number control transistor Q3 cut-offs are turned on, and when the transistor Q1 end, the transistor Q3 is turned on, when the crystal
When pipe Q1 is turned on, the transistor Q3 cut-offs；
The vibrational control module includes transistor Q4 and electric capacity C1, and the control pole of the transistor Q4 is with the transistor Q2's
First electrode is connected with the first electrode of the transistor Q3；When the transistor Q2 is turned on, the transistor Q2 controls
The transistor Q4 conductings, the vibrational control module work, when the transistor Q3 is turned on, the transistor Q3 controls institute
Transistor Q4 cut-offs are stated, the vibrational control module does not work；One end of the electric capacity C1 connects the stable module and described
The control pole of transistor Q4, the other end connect the boosting drive module；
The boosting drive module includes transformer L1 and piezoelectric buzzer B1, primary coil and the crystalline substance of the transformer L1
The first electrode of body pipe Q4 is connected, the secondary coil of the transformer L1 and first pins of piezoelectric buzzer B1 and second
Pins in parallel；When the electric capacity C1 is charged or discharges, transistor Q4 realizes the vibration on or off switching state
The control module control boosting drive module work so that the primary coil of the transformer L1 ceaselessly vibrates, the pressure
Electric buzzer B1 sounds a buzzer because of piezo-electric effect.
2. piezo buzzer drive circuit as claimed in claim 1, it is characterised in that the 3rd of the piezoelectric buzzer B1
Pin is also connected with the electric capacity C1, by the oscillatory feedback signal output of piezoelectric buzzer B1 to the electric capacity C1, the electricity
Holding C1 electric discharges makes the transistor Q4 cut-offs, and oscillatory feedback signal BEEP_F is high level, when the transistor Q4 is turned on, vibration
Feedback signal BEEP_F is low level, the electric capacity C1 chargings.
3. piezo buzzer drive circuit as claimed in claim 2, it is characterised in that the vibrational control module starts
When, the transistor Q4 first time conducting states so that the boosting drive module starts, now, oscillatory feedback signal BEEP_
F is first low level, and the electric capacity C1 sparks ends transistor Q4, and the oscillatory feedback signal BEEP_F is changed into high electricity
Flat, after the electric capacity C1 electric discharges terminate, the transistor Q4 is changed into conducting state, the vibration by the control of the transistor Q2
Feedback signal BEEP_F is changed into low level again.
4. piezo buzzer drive circuit as claimed in claim 2, it is characterised in that the stable module also includes two poles
Pipe D1, the diode D1 are in parallel with the transistor Q3, are Zener diode, for carrying out to oscillatory feedback signal BEEP_F
Voltage stabilizing, protects the transistor Q3.
5. piezo buzzer drive circuit as claimed in claim 2, it is characterised in that the vibrational control module also includes
Diode D2, the diode D2 are in parallel with the transistor Q4, are Zener diode, work in the vibrational control module
When, the transistor Q4 is protected.
6. piezo buzzer drive circuit as claimed in claim 1, it is characterised in that the first electrode of the transistor Q3
Also be connected with the first electrode of the transistor Q2, when the transistor Q2 turn on, in saturation state when, be described stable
Module provides power supply.
7. piezo buzzer drive circuit as claimed in claim 1, it is characterised in that the transformer L1 is self coupling transformation
Device.
8. piezo buzzer drive circuit as claimed in claim 7, it is characterised in that change the no-load voltage ratio of the transformer L1
Design can make secondary coil obtain higher electromotive force, and the piezoelectric buzzer B1 sends high-decibel buzzer.
9. piezo buzzer drive circuit as claimed in claim 1, it is characterised in that the operation principle of the transistor Q3
For voltage control.
10. the piezo buzzer drive circuit as described in any one of claim 1 to 9, it is characterised in that the transistor
Q1, transistor Q2, transistor Q3 and transistor Q4 include bipolar transistor or metal-oxide-semiconductor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611102144.3A CN106531140B (en) | 2016-12-05 | 2016-12-05 | Piezoelectric buzzer driving circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611102144.3A CN106531140B (en) | 2016-12-05 | 2016-12-05 | Piezoelectric buzzer driving circuit |
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| CN106531140A true CN106531140A (en) | 2017-03-22 |
| CN106531140B CN106531140B (en) | 2023-05-05 |
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| CN201611102144.3A Active CN106531140B (en) | 2016-12-05 | 2016-12-05 | Piezoelectric buzzer driving circuit |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107599960A (en) * | 2017-07-31 | 2018-01-19 | 深圳市朗仁科技有限公司 | Buzzer drive circuit |
| CN109003597A (en) * | 2018-09-25 | 2018-12-14 | 无锡华润矽科微电子有限公司 | Buzzer drive circuit and corresponding buzzer driving method |
| CN109272976A (en) * | 2018-10-25 | 2019-01-25 | 无锡十顶电子科技有限公司 | A kind of buzzer drive circuit |
| CN111128105A (en) * | 2019-11-29 | 2020-05-08 | 深圳南云微电子有限公司 | Electromagnetic buzzer |
| CN113257213A (en) * | 2021-07-16 | 2021-08-13 | 深圳市泛海数据科技有限公司 | Dual-mode piezoelectric buzzer driving circuit and driving method |
| CN113426651A (en) * | 2021-05-21 | 2021-09-24 | 四川步歌科技有限公司 | Ultrasonic circuit and pain therapeutic apparatus comprising same |
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| CN107599960A (en) * | 2017-07-31 | 2018-01-19 | 深圳市朗仁科技有限公司 | Buzzer drive circuit |
| CN107599960B (en) * | 2017-07-31 | 2020-04-14 | 深圳市朗仁科技有限公司 | Buzzer driving circuit |
| CN109003597A (en) * | 2018-09-25 | 2018-12-14 | 无锡华润矽科微电子有限公司 | Buzzer drive circuit and corresponding buzzer driving method |
| CN109003597B (en) * | 2018-09-25 | 2023-11-03 | 华润微集成电路(无锡)有限公司 | Buzzer driving circuit and corresponding buzzer driving method |
| CN109272976A (en) * | 2018-10-25 | 2019-01-25 | 无锡十顶电子科技有限公司 | A kind of buzzer drive circuit |
| CN109272976B (en) * | 2018-10-25 | 2023-09-05 | 无锡十顶电子科技有限公司 | Buzzer driving circuit |
| CN111128105A (en) * | 2019-11-29 | 2020-05-08 | 深圳南云微电子有限公司 | Electromagnetic buzzer |
| CN111128105B (en) * | 2019-11-29 | 2022-09-23 | 深圳南云微电子有限公司 | Electromagnetic buzzer |
| CN113426651A (en) * | 2021-05-21 | 2021-09-24 | 四川步歌科技有限公司 | Ultrasonic circuit and pain therapeutic apparatus comprising same |
| CN113257213A (en) * | 2021-07-16 | 2021-08-13 | 深圳市泛海数据科技有限公司 | Dual-mode piezoelectric buzzer driving circuit and driving method |
| CN113257213B (en) * | 2021-07-16 | 2021-09-14 | 深圳市泛海数据科技有限公司 | Dual-mode piezoelectric buzzer driving circuit and driving method |
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