CN209133214U - A kind of buzzer drive circuit and electrical equipment - Google Patents
A kind of buzzer drive circuit and electrical equipment Download PDFInfo
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- CN209133214U CN209133214U CN201821528432.XU CN201821528432U CN209133214U CN 209133214 U CN209133214 U CN 209133214U CN 201821528432 U CN201821528432 U CN 201821528432U CN 209133214 U CN209133214 U CN 209133214U
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Abstract
The utility model embodiment is related to actuation techniques field, more particularly to a kind of buzzing driving circuit and electrical equipment.Buzzer drive circuit includes: power switch circuit, the first driving circuit, the second driving circuit；Passive buzzer, first port are connect with the first driving circuit, and second port is connect with the second driving circuit；When power switch circuit conducting, extraneous power supply is the first driving circuit and the second drive circuitry, the level that first driving circuit acts on first port replaces between high level and low level, in the case where it is high level that the first driving circuit, which acts on first port, it is low level that second driving circuit, which acts on second port, in the case where the first driving circuit acts on first port as low level situation, it is high level that the second driving circuit, which acts on second port,.It is driven as a result, without PWM, the driving to passive buzzer is just realized by the first driving circuit and the second driving circuit, reduces the occupancy of PWM resource.
Description
Technical field
The utility model embodiment is related to actuation techniques field, sets more particularly to a kind of buzzing driving circuit and electric appliance
It is standby.
Background technique
Buzzer is a kind of electronics buzzer, audio signal can be converted to the pronunciation device of voice signal, using direct current
Power voltage supply, in bank, the alarm system of public security, electronic toy, smoke exhaust ventilator, oven, washing machine, the household electrical appliance such as micro-wave oven
In be all widely used.General buzzer includes active buzzer and passive buzzer, active buzzer and passive buzzing
The difference of device essentially consists in active buzzer and is internally provided with multiple oscillating circuits, therefore traditional active buzzer controls electricity
Road applies power switch signal directly to active buzzer, and active buzzer can normally sounding work, but actual application
In, although active buzzer control is simple, defect is that cost is relatively high, uses in moist environment long, is easily damaged.And nothing
Source buzzer then compensates for active buzzer disadvantage, and cost is cheaper, is hardly damaged.
In the process of implementing the utility model, following ask exists in the prior art in the inventor of the utility model
Topic: in the prior art, passive buzzer needs PWM (Pulse Width Modulation, pulse width modulation) driving.?
In the design of system, the PWM resource of microcontroller is often more nervous, and this driving method can occupy more PWM money
Source.Therefore, it is necessary for capable of providing one and can also drive the inexpensive circuit of passive buzzer without PWM.
Utility model content
The utility model embodiment mainly solving the technical problems that provide a kind of buzzing driving circuit and electrical equipment,
The buzzing driving circuit aims to solve the problem that passive buzzer needs PWM driving to lead to the problem of occupying more PWM resource.
In a first aspect, in order to solve the above technical problems, the technical solution that the utility model embodiment uses is: mentioning
For a kind of buzzer drive circuit, comprising:
Power switch circuit, input terminal are connect with extraneous power supply；
First driving circuit is connect with the output end of the power switch circuit；
Second driving circuit is connect with the output end of the power switch circuit, first driving circuit respectively；
Passive buzzer comprising first port and second port, the first port are used for and the first driving electricity
Road connection, the second port with second driving circuit for connecting；
When power switch circuit conducting, external world's power supply is first driving circuit and described second
Drive circuitry, the level that first driving circuit acts on the first port are handed between high level and low level
It replaces, wherein in the case where it is high level that first driving circuit, which acts on the first port, second driving circuit
Acting on the second port is low level, and acting on the first port in first driving circuit is low level situation
Under, it is high level that second driving circuit, which acts on the second port,.
Optionally, first driving circuit is opened including the first bleeder circuit, the second bleeder circuit, first capacitor and first
One end of Guan Guan, first bleeder circuit and second bleeder circuit connects with the output end of the power switch circuit
Connect, the other end of first bleeder circuit respectively with the first port, one end of the first capacitor, the first switch
The input terminal of pipe connects, and the other end of second bleeder circuit drives with the other end of the first capacitor, described second respectively
Dynamic circuit connection, the control terminal of the first switch tube are connect with second driving circuit, the output of the first switch tube
End ground connection.
Optionally, first bleeder circuit includes first resistor, and second bleeder circuit includes second resistance, described
First switch tube includes the first triode；
Wherein, one end of the first resistor and the second resistance connects with the output end of the power switch circuit
Connect, the other end of the first resistor respectively with the first port, one end of the first capacitor, first triode
Input terminal connection, the other end of the second resistance connect with the other end of the first capacitor, second driving circuit respectively
It connects, the control terminal of first triode is connect with second driving circuit, the output end ground connection of first triode.
Optionally, first triode includes NPN triode.
Optionally, second driving circuit includes that third bleeder circuit, the 4th bleeder circuit, the second capacitor and second are opened
One end of Guan Guan, the third bleeder circuit and the 4th bleeder circuit connects with the output end of the power switch circuit
Connect, the other end of the third bleeder circuit respectively with the second port, one end of second capacitor, the second switch
The input terminal of pipe connects, and the other end of the 4th bleeder circuit is opened with the other end of the first capacitor, described first respectively
Close the control terminal connection of pipe, the control terminal of the second switch respectively with the other end of second bleeder circuit, described the
The other end of one capacitor connects, the output end ground connection of the second switch.
Optionally, the third bleeder circuit includes 3rd resistor, and the 4th bleeder circuit includes the 4th resistance, described
Second switch includes the second triode；
Wherein, one end of the 3rd resistor and the 4th resistance connects with the output end of the power switch circuit
Connect, the other end of the 3rd resistor respectively with the second port, one end of second capacitor, the second switch
Input terminal connection, the control with the other end of the first capacitor, first triode respectively of the other end of the 4th resistance
End processed connection, the control terminal of second triode respectively with the other end of the second resistance, the first capacitor it is another
End connection, the output end ground connection of second triode.
Optionally, second triode includes NPN triode.
Optionally, the power switch circuit includes the 5th bleeder circuit, the 6th bleeder circuit and third switching tube, described
The input terminal of one end of 5th bleeder circuit and the third switching tube is connect with the extraneous power supply, and described 5th point
The control terminal of the other end of volt circuit and the third switching tube is connect with one end of the 6th bleeder circuit, and the described 6th
The other end of bleeder circuit is connect with extraneous control terminal.
Optionally, the 5th bleeder circuit includes the 5th resistance, and the 6th bleeder circuit includes the 6th resistance, described
Third switching tube includes third transistor, and the third transistor includes PNP triode；
Wherein, the input terminal of one end of the 5th resistance and the third transistor connects with the extraneous power supply
It connects, the one end of the other end of the 5th bleeder circuit and the control terminal of the third transistor with the 6th bleeder circuit
Connection, the other end of the 6th bleeder circuit are connect with external world's control terminal, the output end of the third transistor respectively with institute
The first driving circuit is stated to connect with second driving circuit；
If the third transistor is connected when external world's control terminal input low level, then the extraneous power supply is
First driving circuit and second drive circuitry.
Second aspect, in order to solve the above technical problems, another technical solution that the utility model embodiment uses is:
There is provided a kind of electrical equipment, comprising: buzzer drive circuit as described above.
The beneficial effect of the utility model embodiment is: being in contrast to the prior art, implements in the utility model
In mode, buzzer drive circuit includes: power switch circuit, and input terminal is connect with extraneous power supply；First driving electricity
Road is connect with the output end of the power switch circuit；Second driving circuit, it is defeated with the power switch circuit respectively
Outlet, first driving circuit connection；Passive buzzer comprising first port and second port, the first port are used
It is connect in first driving circuit, the second port with second driving circuit for connecting；When the power supply is opened
When powered-down road is connected, external world's power supply is first driving circuit and second drive circuitry, described the
The level that one drive circuit acts on the first port replaces between high level and low level, wherein when first drive
For dynamic circuit function when the first port is high level, then it is low electricity that second driving circuit, which acts on the second port,
Flat, when it is low level that first driving circuit, which acts on the first port, then second driving circuit acts on institute
Stating second port is high level.It drives without PWM, can be realized by the first driving circuit and the second driving circuit as a result,
Driving to passive buzzer, to reduce the occupancy of PWM resource, reduce software development difficulty.
Detailed description of the invention
One or more embodiments are illustrated by the picture in corresponding attached drawing, these are exemplary
Illustrate not constitute the restriction to embodiment, the element in attached drawing with same reference numbers label is expressed as similar member
Part, unless there are special statement, composition does not limit the figure in attached drawing.
Fig. 1 is a structural block diagram of the utility model embodiment buzzer drive circuit；
Fig. 2 is another structural block diagram of the utility model embodiment buzzer drive circuit；
Fig. 3 is the circuit structure diagram of the utility model embodiment buzzer drive circuit.
Specific embodiment
For the ease of understanding the utility model, with reference to the accompanying drawings and detailed description, the utility model is carried out more
Detailed description.It should be noted that it can be directly in another element when element is expressed " being fixed on " another element
Upper or placed in the middle there may be one or more therebetween elements.When an element is expressed " connection " another element, it can
To be directly to another element or elements placed in the middle there may be one or more therebetween.This specification is used
Term "vertical", "horizontal", "left" and "right" and similar statement for illustrative purposes only.
Unless otherwise defined, technical and scientific term all used in this specification and the skill for belonging to the utility model
The normally understood meaning of the technical staff in art field is identical.Art used in the description of the utility model in this specification
Language is only for the purpose of describing specific embodiments, and is not intended to limitation the utility model.Art used in this specification
Language "and/or" includes any and all combinations of one or more related listed items.
It please refers to Fig.1 to Fig.3, the buzzer drive circuit 100 of the utility model embodiment includes: power switch circuit
10, the first driving circuit 20, the second driving circuit 30 and passive buzzer BUZ；
Wherein, the input terminal of power switch circuit 10 is connect with external world power supply VCC；First driving circuit 20 and second
Driving circuit 30 is connect with the output end of power switch circuit 10；First driving circuit 20 also connects with the second driving circuit 30
It connects；Passive buzzer BUZ includes first port K1 and second port K2, and first port K1 is used to connect with the first driving circuit 20
It connects, second port K2 with the second driving circuit 30 for connecting；When power switch circuit 10 is connected, extraneous power supply VCC
It powers for the first driving circuit 20 and the second driving circuit 30, the first driving circuit 20 acts on the level of first port K1 in height
Between level and low level alternately, wherein in the case where it is high level that the first driving circuit 20, which acts on first port K1, then
It is low level that second driving circuit 30, which acts on second port K2, and acting on first port K1 in the first driving circuit 20 is low electricity
In the case where flat, then it is high level that the second driving circuit 30, which acts on second port K2,.As a result, without being driven by setting PWM
Passive buzzer BUZ, only need to by the first driving circuit 20 and the second driving circuit 30 passive buzzer BUZ first end
Oscillator signal is formed between mouth K1 and second port K2, passive buzzer BUZ obtains the low and high level square-wave signal intercoursed,
Passive buzzer BUZ issues the sound of certain frequency, is achieved in passive buzzing under the square-wave signal effect of height variation
The driving of device BUZ, to reduce the occupancy of PWM resource, reduce software development difficulty, save the resource of single-chip microcontroller and want
It asks.
Further, the first driving circuit 20 include the first bleeder circuit 21, the second bleeder circuit 22, first capacitor C1 and
One end of first switch tube 23, the first bleeder circuit 21 and the second bleeder circuit 22 connects with the output end of power switch circuit 10
It connects, the input with first port K1, one end of first capacitor C1, first switch tube 23 respectively of the other end of the first bleeder circuit 21
End connection, the other end of the second bleeder circuit 22 are connect with the other end of first capacitor C1, the second driving circuit 30 respectively, and first
The control terminal of switching tube 23 is connect with the second driving circuit 30, the output end ground connection of first switch tube 23.Specifically, the first partial pressure
Circuit 21 includes first resistor R1, and the second bleeder circuit 22 includes second resistance R2, and first switch tube 23 includes the first triode
Q1；Optionally, the first triode Q1 includes NPN triode.Wherein, one end of first resistor R1 and second resistance R2 is and power supply
The output end of switching circuit 10 connects, the other end of first resistor R1 respectively with first port K1, one end of first capacitor C1, the
The input terminal (collector of the first triode Q1) of one triode Q1 connects, the other end of second resistance R2 respectively with first capacitor
The other end of C1, the connection of the second driving circuit 30, the control terminal (base stage of the first triode Q1) and second of the first triode Q1
Driving circuit 30 connects, output end (emitter of the first triode Q1) ground connection of the first triode Q1.Optionally, first resistor
The resistance value of R1 can be 1 kilo-ohm, and the resistance value of second resistance R2 can be 47 kilo-ohms, and the capacitance of first capacitor C1 can be 4.7 nanofarads.
Further, the second driving circuit 30 include third bleeder circuit 31, the 4th bleeder circuit 32, the second capacitor C2 and
One end of second switch 33, third bleeder circuit 31 and the 4th bleeder circuit 32 connects with the output end of power switch circuit 10
It connects, the input with one end, second switch 33 of second port K2, the second capacitor C2 respectively of the other end of third bleeder circuit 31
End connection, the other end of the 4th bleeder circuit 32 connect with the control terminal of the other end of first capacitor C2, first switch tube 23 respectively
It connecing, the control terminal of second switch 33 is connect with the other end of the other end of the second bleeder circuit 22, first capacitor C1 respectively, the
The output end of two switching tubes 33 is grounded.Specifically, third bleeder circuit 31 includes 3rd resistor R3, the 4th bleeder circuit 32 includes
4th resistance R4, second switch 33 include the second triode Q2；Optionally, the second triode Q2 includes NPN triode.Its
In, one end of 3rd resistor R3 and the 4th resistance R4 are connect with the output end of power switch circuit 10, and 3rd resistor R3's is another
One end respectively with second port K2, one end of the second capacitor C2, second switch 33 the input terminal (current collection of the second triode Q2
Pole) connection, the other end of the 4th resistance R4 control terminal (first with the other end of first capacitor C1, the first triode Q1 respectively
The base stage of triode Q1) connection, the control terminal (base stage of the second triode Q2) of the second triode Q2 respectively with second resistance R2
The other end, first capacitor C1 other end connection, the output end (emitter of the second triode Q2) of the second triode Q2 connects
Ground.Optionally, the resistance value of 3rd resistor R3 can be 1 kilo-ohm, and the resistance value of the 4th resistance R4 can be 47 kilo-ohms, the electricity of first capacitor C2
Capacitance can be 4.7 nanofarads.
Further, power switch circuit 10 includes the 5th bleeder circuit 11, the 6th bleeder circuit 12 and third switching tube
13, one end of the 5th bleeder circuit 11 and the input terminal of third switching tube 13 are connect with extraneous power supply VCC, the 5th partial pressure
The other end of circuit 11 and the control terminal of third switching tube 13 are connect with one end of the 6th bleeder circuit 12, the 6th bleeder circuit
12 other end is connect with external world control terminal BUZZER, and extraneous control terminal BUZZER can be the output control terminal of single-chip microcontroller.Specifically
, the 5th bleeder circuit 11 includes the 5th resistance R5, and the 6th bleeder circuit 12 includes the 6th resistance R6, and third switching tube 13 includes
Third transistor Q3, third transistor Q3 include PNP triode；Wherein, one end of the 5th resistance R5 and third transistor Q3
Input terminal (emitter of third transistor Q3) is connect with extraneous power supply VCC, the other end of the 5th bleeder circuit 11 and
The control terminal (base stage of third transistor Q3) of third transistor Q3 is connect with one end of the 6th bleeder circuit 12, the 6th partial pressure
The other end of circuit 12 is connect with external world control terminal BUZZER, the output end of third transistor Q3 respectively with the first driving circuit 20
It is connected with the second driving circuit 30；When extraneous control terminal BUZZER input low level, third transistor Q3 conducting is then extraneous to supply
Power supply VCC is that the first driving circuit 20 and the second driving circuit 30 are powered.Optionally, the resistance value of the 5th resistance R5 can be 1,000
Europe, the resistance value of the 6th resistance R6 can be 1 kilo-ohm.
It is worth noting that: in the utility model embodiment, the first triode Q1 and the second triode Q2 are identical
The triode of model, due to can have subtle parameter difference between the triode of same model away from just because of this is subtle
Parameter difference away from so that when extraneous power supply VCC starts to power for the first driving circuit 20 and the second driving circuit 30, first
Necessarily there is a meeting elder generation saturation conduction in triode Q1 and the second triode Q2, and then the utility model embodiment may be implemented
The course of work.
In order to preferably explain the working principle of the utility model embodiment specific implementation, do below further in detail
Thin elaboration:
When the output control terminal of single-chip microcontroller exports low level to extraneous control terminal BUZZER, which passes through the 6th electricity
Resistance R6 acts on the control terminal (base stage of third transistor Q3) of third transistor Q3, due to the presence of the 5th resistance R5, power supply
Switching circuit 10 will be connected this moment, and extraneous power supply VCC will start to supply for the first driving circuit 20 and the second driving circuit 30
Electricity.Since there are subtle parameter differences away from so that as extraneous power supply VCC between the first triode Q1 and the second triode Q2
When starting to power for the first driving circuit 20 and the second driving circuit 30, necessarily have in the first triode Q1 and the second triode Q2
One meeting elder generation saturation conduction.
Enter the first stage at this time: assuming that the first triode Q1 saturation conduction first, the first port of passive buzzer BUZ
K1 will be grounded to obtain low level signal by the first triode Q1, since the voltage at the both ends first capacitor C1 can not be mutated, so
When the first triode Q1 saturation conduction first, and the moment of the second triode Q2 unsaturation conducting, the control of the second triode Q2
The common end that end (base stage of the second triode Q2) is connect with first capacitor C1 will be pulled low to low level, so as to cause the two or three
Pole pipe Q2 cut-off, since the second triode Q2 at this time ends, extraneous power supply VCC will act on the of passive buzzer BUZ
Two-port netwerk K2 makes the second port K2 of passive buzzer BUZ obtain high level, as a result, in the first phase, passive buzzer
The first port K1 of BUZ obtains low level, and the second port K2 of passive buzzer BUZ obtains high level, and initially enters second
Stage.
Second stage: due to the first triode Q1 saturation conduction first, external world power supply VCC begins through second
Resistance R2 is that first capacitor C1 charges, when the current potential of first capacitor C1 is charged between the pole BE that can make the second triode Q2
When forward bias, the second triode Q2 will be connected, and the second port K2 of moment passive buzzer BUZ is because pass through the two or three at this time
Pole pipe Q2 is grounded to obtain low level, since the voltage at the second both ends capacitor C2 can not be mutated, the second capacitor C2 and the one or three pole
The common end of control terminal (base stage of the first triode Q1) connection of pipe Q1 is pulled low to low level, and the first triode Q1 is caused to cut
Only, extraneous power supply VCC will act on the first port K1 of passive buzzer BUZ by first resistor, to make passive bee
The first port K1 of ring device BUZ obtains high level, and as a result, in second stage, the first port K1 of passive buzzer BUZ is obtained
The second port K2 of high level, passive buzzer BUZ obtains low level.
Into after second stage, it is that the second capacitor C2 charges that extraneous power supply VCC, which begins through the 4th resistance R4,
When forward bias between the current potential of the second capacitor C2 is charged to the pole BE that can make the first triode Q1, the first triode Q1 will again
Thus secondary conducting is again introduced into the first stage, thus iterative cycles carry out first stage and second stage.
So, without driving passive buzzer BUZ by the way that PWM is arranged, need to only lead in the utility model embodiment
Cross the first driving circuit 20 and the second driving circuit 30 shape between the first port K1 and second port K2 of passive buzzer BUZ
At oscillator signal, passive buzzer BUZ obtains the low and high level square-wave signal intercoursed, and passive buzzer BUZ becomes in height
Under the square-wave signal effect of change, the sound of certain frequency is issued, the driving to passive buzzer BUZ is achieved in, to reduce
The occupancy of PWM resource, the resource and requirement for reducing software development difficulty, saving single-chip microcontroller.It is worth noting that: single-chip microcontroller
Output control terminal output signal only need to use common port, need to control passive buzzer BUZ work when then export it is low
Level, high level is exported when needing to turn off passive buzzer BUZ, and the software logic of single-chip microcontroller is very simple.And in this reality
With in novel embodiment, the type selecting of device is all common Chip-R, capacitor and triode, and cost is relatively low, Er Qieshi
With the circuit of the utility model embodiment can substitute the driving circuit of traditional buzzer, and apply in washing machine, bake
The big household electrical appliances of furnace, refrigerator, smoke exhaust ventilator etc. or small household electrical appliance, practicability are very high.
Another technical solution that the utility model embodiment uses is: providing a kind of electrical equipment (not shown), wraps
It includes: buzzer drive circuit 100 as described above.Optionally, electrical equipment includes washing machine, oven, refrigerator, smoke exhaust ventilator etc.
Etc. big household electrical appliances or small household electrical appliance.
The foregoing is merely the embodiments of the present invention, and therefore it does not limit the scope of the patent of the utility model, all
It is equivalent structure or equivalent flow shift made based on the specification and figures of the utility model, directly or indirectly uses
In other related technical areas, it is also included in the patent protection scope of the utility model.
Claims (10)
1. a kind of buzzer drive circuit characterized by comprising
Power switch circuit, input terminal are connect with extraneous power supply；
First driving circuit is connect with the output end of the power switch circuit；
Second driving circuit is connect with the output end of the power switch circuit, first driving circuit respectively；
Passive buzzer comprising first port and second port, the first port are used to connect with first driving circuit
It connects, the second port with second driving circuit for connecting；
When power switch circuit conducting, external world's power supply is first driving circuit and second driving
Circuit power supply, the level that first driving circuit acts on the first port replace between high level and low level,
In, in the case where it is high level that first driving circuit, which acts on the first port, the second driving circuit effect
In the second port be low level, first driving circuit act on the first port be low level situation under,
It is high level that second driving circuit, which acts on the second port,.
2. buzzer drive circuit according to claim 1, which is characterized in that
First driving circuit includes the first bleeder circuit, the second bleeder circuit, first capacitor and first switch tube, and described the
One end of one bleeder circuit and second bleeder circuit is connect with the output end of the power switch circuit, first point described
The other end of volt circuit connects with the input terminal of the first port, one end of the first capacitor, the first switch tube respectively
It connects, the other end of second bleeder circuit is connect with the other end of the first capacitor, second driving circuit respectively, institute
The control terminal for stating first switch tube is connect with second driving circuit, the output end ground connection of the first switch tube.
3. buzzer drive circuit according to claim 2, which is characterized in that
First bleeder circuit includes first resistor, and second bleeder circuit includes second resistance, the first switch tube
Including the first triode；
Wherein, one end of the first resistor and the second resistance is connect with the output end of the power switch circuit, institute
State the other end input with one end, first triode of the first port, the first capacitor respectively of first resistor
End connection, the other end of the second resistance are connect with the other end of the first capacitor, second driving circuit respectively, institute
The control terminal for stating the first triode is connect with second driving circuit, the output end ground connection of first triode.
4. buzzer drive circuit according to claim 3, which is characterized in that
First triode includes NPN triode.
5. buzzer drive circuit according to claim 3, which is characterized in that
Second driving circuit includes third bleeder circuit, the 4th bleeder circuit, the second capacitor and second switch, and described
One end of three bleeder circuits and the 4th bleeder circuit is connect with the output end of the power switch circuit, the third point
The other end of volt circuit connects with the input terminal of the second port, one end of second capacitor, the second switch respectively
It connects, the other end of the 4th bleeder circuit control terminal with the other end of the first capacitor, the first switch tube respectively
Connection, the control terminal of the second switch respectively with the other end of second bleeder circuit, the first capacitor it is another
End connection, the output end ground connection of the second switch.
6. buzzer drive circuit according to claim 5, which is characterized in that
The third bleeder circuit includes 3rd resistor, and the 4th bleeder circuit includes the 4th resistance, the second switch
Including the second triode；
Wherein, one end of the 3rd resistor and the 4th resistance is connect with the output end of the power switch circuit, institute
State the other end input with the second port, one end, the second switch of second capacitor respectively of 3rd resistor
End connection, the other end of the 4th resistance control terminal with the other end of the first capacitor, first triode respectively
Connection, the control terminal of second triode connect with the other end of the other end of the second resistance, the first capacitor respectively
It connects, the output end ground connection of second triode.
7. buzzer drive circuit according to claim 6, which is characterized in that
Second triode includes NPN triode.
8. buzzer drive circuit according to claim 6, which is characterized in that
The power switch circuit includes the 5th bleeder circuit, the 6th bleeder circuit and third switching tube, the 5th partial pressure electricity
The input terminal of the one end on road and the third switching tube is connect with the extraneous power supply, the 5th bleeder circuit it is another
The control terminal of one end and the third switching tube is connect with one end of the 6th bleeder circuit, the 6th bleeder circuit
The other end is connect with extraneous control terminal.
9. buzzer drive circuit according to claim 8, which is characterized in that
5th bleeder circuit includes the 5th resistance, and the 6th bleeder circuit includes the 6th resistance, the third switching tube
Including third transistor, the third transistor includes PNP triode；
Wherein, the input terminal of one end of the 5th resistance and the third transistor is connect with the extraneous power supply,
The other end of 5th bleeder circuit and the control terminal of the third transistor connect with one end of the 6th bleeder circuit
Connect, the other end of the 6th bleeder circuit is connect with extraneous control terminal, the output end of the third transistor respectively with it is described
First driving circuit is connected with second driving circuit；
When the extraneous control terminal input low level, the third transistor conducting, then the extraneous power supply is described
First driving circuit and second drive circuitry.
10. a kind of electrical equipment characterized by comprising
Buzzer drive circuit as claimed in claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821528432.XU CN209133214U (en) | 2018-09-18 | 2018-09-18 | A kind of buzzer drive circuit and electrical equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821528432.XU CN209133214U (en) | 2018-09-18 | 2018-09-18 | A kind of buzzer drive circuit and electrical equipment |
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| Publication Number | Publication Date |
|---|---|
| CN209133214U true CN209133214U (en) | 2019-07-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201821528432.XU Active CN209133214U (en) | 2018-09-18 | 2018-09-18 | A kind of buzzer drive circuit and electrical equipment |
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| Country | Link |
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| CN (1) | CN209133214U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109003596A (en) * | 2018-09-18 | 2018-12-14 | 深圳和而泰智能控制股份有限公司 | A kind of buzzer drive circuit and electrical equipment |
-
2018
- 2018-09-18 CN CN201821528432.XU patent/CN209133214U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109003596A (en) * | 2018-09-18 | 2018-12-14 | 深圳和而泰智能控制股份有限公司 | A kind of buzzer drive circuit and electrical equipment |
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