CN108780636A - Buzzer control circuit and buzzer - Google Patents
Buzzer control circuit and buzzer Download PDFInfo
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- CN108780636A CN108780636A CN201780008994.3A CN201780008994A CN108780636A CN 108780636 A CN108780636 A CN 108780636A CN 201780008994 A CN201780008994 A CN 201780008994A CN 108780636 A CN108780636 A CN 108780636A
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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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Abstract
A kind of buzzer control circuit and buzzer.The control circuit includes：The first input end (11) of first pwm control signal；According to the first pwm control signal of input, the voltage-regulating circuit of the service voltage of buzzer is adjusted；The voltage-regulating circuit has the first service voltage connecting pin (21) being connect with the first port (B1) of buzzer and the second service voltage connecting pin (22) being connect with the second port (B2) of buzzer；The second input terminal (12) of second pwm control signal；The alternating control unit (300) being connect with first service voltage connecting pin (21) and the second service voltage connecting pin (22)；The alternately control unit (300) changes the current direction for flowing through buzzer according to the level change of second pwm control signal.The U.S. audio fruit of the control circuit can be controlled by pwm control signal, and adjustable range is flexible, but also carry out positive and negative alternately control to buzzer both ends based on pwm control signal, have preferably U.S. audio fruit.
Description
Technical field
This application involves signal control technology fields, more particularly to a kind of buzzer control circuit and buzzer.
Background technology
As a kind of prompting of man-machine communication, buzzer is that one kind is widely used in various household electrical appliance, in man-machine friendship
Promptings is played in mutually, such as button operation response, the commonly used equipment for the effects that function is completed to remind, and function starts prompting.
In common buzzer circuit, the buzzer being capable of providing only has a kind of frequency, and the sound of buzzer does not have
It is fade-in and gradually goes out, sound is more stiff, sounds not melodious enough.And in some expensive goods, the demand based on user, it is desirable that bee
Ring device can send out musical sound or melodious ding-dong sound, thus derive U.S. this branch of sound buzzer circuit.
Existing a variety of method realizes the target of U.S. sound buzzer.Wherein there is a kind of U.S. sound buzzer circuit, passes through
Capacitance is introduced, it is not to lose but decline within a certain period of time immediately, and then form buzzer to make the voltage of piezo buzzer
Lingering sound and the gradually smaller effect of lingering sound volume are sent out, certain scale can be generated, sound quality is more graceful.
During realizing the application, inventor has found that the relevant technologies have the following problems：Above-mentioned realization U.S. audio fruit
In technical solution, need to select good electric discharge electrolytic capacitor, with the passage of usage time, capacitance can reduce and cause to put
The variation of electric time.Moreover, by the way of capacitance electric discharge, the time of electric discharge is fixed, and the time of U.S. sound can not adjust.
Invention content
The embodiment of the present application can solve mainly solving the technical problems that provide a kind of buzzer control circuit and buzzer
Certainly prior art Sino-U.S. audio fruit is bad, the problem of by capacitance influence of fading.
In order to solve the above technical problems, some embodiments of the present application provide a kind of buzzer control circuit.Control electricity
Road includes：First input end for inputting the first pwm control signal；According to the first pwm control signal of input, buzzing is adjusted
The voltage-regulating circuit of the service voltage of device；
The voltage-regulating circuit have the first service voltage connecting pin for being connect with the first port of buzzer and with
Second service voltage connecting pin of the second port connection of buzzer；
The second input terminal for inputting the second pwm control signal；With first service voltage connecting pin and second
The alternating control unit of service voltage connecting pin connection；It is described to replace electricity of the control unit according to second pwm control signal
Flat variation, changes the current direction for flowing through buzzer.
Optionally, the voltage-regulating circuit includes：At least one operational amplifier；The operational amplifier according to it just
The first pwm control signal inputted to input terminal, the service voltage of corresponding buzzer is exported in its output end；The operation is put
Output end connection first service voltage connecting pin of big device and the second service voltage connecting pin.
Optionally, the voltage-regulating circuit includes：The voltage-regulating circuit includes：Thirteenth resistor, the 14th electricity
Resistance, the second capacitance, the 15th resistance, the 16th resistance, the 17th resistance and operational amplifier；Input the first PWM control letters
Number first input end connect with one end of the 16th resistance, the other end of the 16th resistance is connect by the thirteenth resistor
Ground is also connected by the positive input of the 17th resistance and operational amplifier；The reverse input end of the operational amplifier is logical
The 14th resistance eutral grounding is crossed, is also connected by the output end of the 15th resistance and operational amplifier.
Optionally, the voltage-regulating circuit includes：According to the first pwm control signal of input, corresponding control is exported
The duty ratio of the adjustment unit of electric current, control first pwm control signal of current following changes and changes；And according to described
Electric current is controlled, the signal amplification unit of the service voltage of buzzer is adjusted.
Optionally, the adjustment unit includes：It is connected when first pwm control signal is high level, the first PWM controls
The switching circuit that signal processed ends when being low level；
The first resistor being connect with the output end of the switching circuit；And
When the switching circuit is connected, the first capacitance for being charged by the first resistor, wherein first capacitance
On voltage determine the control electric current.
Optionally, the control circuit further includes：The DC power supply of control circuit operating voltage is provided.
Optionally, the switching circuit includes：First triode, the second triode, second resistance, 3rd resistor, the 4th
Resistance, the 5th resistance and the 6th resistance；
The first input end is connect by second resistance with the base stage of first triode, is also connect by 3rd resistor
Ground；The collector of first triode is connect by the 5th resistance with the base stage of the second triode, also by the 4th resistance with
The anode connection of the DC power supply；The anode of the emitter of second triode and the DC power supply is connect, and described the
The collector of two triodes forms the output end of the switching circuit by the 6th resistance eutral grounding.
Optionally, the switching circuit includes：6th triode, the 7th triode, the 8th triode, second resistance,
Three resistance, the 4th resistance；
The first input end for inputting the first pwm control signal is connected by second resistance and the base stage of the 6th triode
It connects, is also grounded by 3rd resistor；The collector of 6th triode is connect with the base stage of the 7th triode, also passes through the 4th
Resistance is connect with the anode of the DC power supply；The collector of 7th triode is connect with the anode of the DC power supply,
The emitter of 7th triode is connect with the emitter of the 8th triode, and forms the output end of the switching circuit；
The base stage of 8th triode is also connect with the base stage of the 7th triode, the current collection of the 8th triode
Pole is grounded.
Optionally, described first resistor one end is connect with the output end of the switching circuit, and the other end of first resistor is logical
Cross the first capacity earth；The connecting pin of first capacitance and first resistor forms the output end of the control electric current.
Optionally, the signal amplification unit includes：Third transistor and the 7th resistance；
The base stage of the third transistor is connect with the output end of the control electric current, also passes through the 7th resistance eutral grounding；Institute
The collector for stating third transistor is connect with the anode of the DC power supply；The emitter voltage of the third transistor is buzzing
The service voltage of device.
Optionally, the emitter of the third transistor of the signal amplification unit connects first service voltage connecting pin
And the second service voltage connecting pin.
Optionally, the alternately control unit includes：The first earth-return circuit and the second ground connection of alternate conduction and cut-off
Circuit；
First earth-return circuit is connect with first service voltage connecting pin；Second earth-return circuit and described the
Two service voltage connecting pins connect；
When second pwm control signal is high level, the conducting of the first earth-return circuit and the cut-off of the second earth-return circuit,
The service voltage is applied to the first port of buzzer；
When second pwm control signal is low level, the cut-off of the first earth-return circuit and the conducting of the second earth-return circuit,
The service voltage is applied to the second port of buzzer.
Optionally, the alternately control unit includes：4th triode, the 5th triode, the 8th resistance, the 9th resistance,
Tenth resistance, eleventh resistor and twelfth resistor；
Second input terminal is connect with described 8th resistance one end, and the other end of the 8th resistance passes through the 9th resistance
Ground connection, also connect with the base stage of the 4th triode；The emitter of 4th triode is grounded, the current collection of the 4th triode
Pole is connect by twelfth resistor with the base stage of the 5th triode, the emitter ground connection of the 5th triode；
The collector of 4th triode is connect by the tenth resistance with first service voltage connecting pin, and also and bee
The first port connection of ring device；
The collector of 5th triode is connect by eleventh resistor with second service voltage connecting pin, also with
The second port of buzzer connects.
In order to solve the above technical problems, the another embodiment of the application provides a kind of buzzer.The buzzer includes：Sounding
Device, pwm signal generating means and buzzer control circuit as described above；The pwm signal generating means and the bee
Device control circuit of ringing connection, exports scheduled pwm control signal to the buzzer control circuit；The buzzer control circuit
It is connect with the sound-producing device, exports corresponding voltage signal to the sound-producing device.
The control circuit provided in the embodiment of the present application controls the service voltage of buzzer by pwm control signal, to
Realize the U.S. audio fruit such as volume adjustment and volume gradual change.The control circuit without using electrolytic capacitor, the U.S. sound time and
Volume fade out or gradual change and other effects can be controlled by pwm control signal, adjustable range is flexible.But also it is based on
Pwm control signal carries out positive and negative alternately control to buzzer both ends, compared with general half positive wave controls, can have better
U.S. audio fruit.
Description of the drawings
One or more embodiments are illustrated by the picture in corresponding attached drawing, these exemplary theorys
The bright restriction not constituted to embodiment, the element with same reference numbers label is expressed as similar element in attached drawing, removes
Non- to have special statement, composition does not limit the figure in attached drawing.
Fig. 1 is the functional block diagram of buzzer control circuit provided by the embodiments of the present application；
Fig. 2 is the functional block diagram for the buzzer control circuit that another embodiment of the application provides；
Fig. 3 is the circuit diagram of buzzer control circuit provided by the embodiments of the present application；
Fig. 4 is the circuit diagram for the buzzer control circuit that another embodiment of the application provides；
Fig. 5 is the circuit diagram of voltage-regulating circuit provided by the embodiments of the present application；
Fig. 6 is the circuit diagram of alternately control unit provided by the embodiments of the present application.
Specific implementation mode
It is with reference to the accompanying drawings and embodiments, right in order to make the object, technical solution and advantage of the application be more clearly understood
The application is further elaborated.It should be appreciated that specific embodiment described herein is only to explain the application, not
For limiting the application.
The buzzer control circuit of the embodiment of the present application can be applied to the buzzer of various suitable types, such as patch type bee
Ring device, contact pin type buzzer or piezo buzzer etc..In actual application, the embodiment of the present application can also be with offer
The pwm signal generating means of PWM (Pulse width modulation, pulse width modulation) control signal are used cooperatively.It should
Pwm signal generating means can be any suitable electronic computing device, such as microcontroller or the pwm signal of other devices composition
Generator, to provide the buzzer control circuit for exporting specific pwm control signal and being supplied to the embodiment of the present application.
The pwm signal generating means can be used as independently arranged module, real by suitable communication mode and the application
The buzzer control circuit connection for applying example offer, provides corresponding pwm control signal.The PWM output equipments are also used as bee
Pwm control signal occurs for the built-in function module for device control circuit of ringing to realize the control to buzzer.In some embodiments
In, it can be with some equipment of additional, such as interact with user, receive the friendship to the adjust instruction of pwm control signal
Mutual equipment or suitable wireless communication module, establish the communication connection between different function units, to transmit instruction or
Control signal or voltage signal.Above-mentioned equipment can also give economization according to actual conditions.
The pwm control signal is the equal impulse waveform of a kind of variable duty ratio, amplitude, can be by adjusting impulse wave
Duty ratio in shape is to realize specific control instruction.Pwm control signal is the control that a kind of comparison is adapted to digital control circuit
Mode processed is suitable for electronic computing device and executes software program completion adjustment, as PC, computer are controlled.In reality
During the use of border, user can adjust pwm control signal to realize for buzzing easily by suitable interactive device
The control of device service voltage.Compared with the U.S. sound for using electrolytic capacitor to be formed, control that can be more flexible by pwm control signal
U.S. audio fruit and not by the capacity impact of electrolytic capacitor.
In some embodiments, some buzzings can also be incorporated into buzzer control circuit provided by the embodiments of the present application
Inside device such as passive buzzer, using passive buzzer as receiving voltage signal, the sound-producing device of corresponding sound is sent out, and by institute
It states control circuit and the voltage signal with specific waveforms is provided it according to the first and/or second pwm control signal of input.This
The buzzer of sample can control the voltage of output easily by the first and/or second pwm control signal of software control input
The waveform of signal, to realize the effect of U.S. sound, as the variation of buzzer volume, buzzer sound gradually go out and are fade-in effect.
Fig. 1 is the functional block diagram of buzzer control circuit provided by the embodiments of the present application.As shown in Figure 1, the buzzer control
The signal input side of circuit processed is first input end 11, receives the first pwm control signal.The the first pwm control signal warp received
After crossing processing, the buzzer that the first pwm control signal changes can be followed in the signal outlet side output of buzzer control circuit
Service voltage Vsupply。
With the variation of the service voltage, the volume (such as piezo buzzer) of buzzer will change therewith.Exist
When service voltage is high, higher volume is sent out.And when service voltage is low, volume decreases.
Include for according to the first pwm control signal, the tune of output control electric current inside the buzzer control circuit
Whole unit 100 and signal amplification unit 200.
The adjustment unit 100 can export corresponding control electric current, that is, follow duty ratio according to the variation of duty ratio
The control electric current of variation.Certainly, the control electric current exported in adjustment unit 100 is the smaller signal of a variable quantity.Therefore,
In actual use, the variation of the control electric current to drive service voltage can not directly be exported.
The adjustment unit 100 specifically may be used any suitable in the prior art, and change in duty cycle is converted to electric current
The functional circuit of variation, the conversion that the combination of the switching circuit being such as made of multiple semiconductor devices and other discrete components is formed
Circuit；Or the patch type device of overall package on a substrate, the chip for accordingly outputting and inputting pin is such as provided.
Signal amplification unit 200, to adjust the service voltage, plays amplification control electric current according to the variation of control electric current
Variation effect.Control electric current can be enabled indirectly to adjust service voltage by the signal amplification unit 200, realize and pass through
Pwm control signal controls the target for being eventually fed voltage.Any suitable, energy specifically may be used in the signal amplification unit 200
The functional circuit for enough realizing signal amplification, can be such as simple triode, can also be to increase biasing circuit, improved
Transistor amplifier can also add or delete some discrete components according to actual conditions.
Usual, there are two input ports for buzzer generally tool, one of them (applies supply electricity for signal input part
Pressure), other end ground connection.As shown in Figure 1, respectively first port B1 and second port B2.
In some embodiments, the outlet side of the signal amplification unit 200 may include the first port with buzzer
First service voltage connecting pin 21 of B1 connections and the second service voltage connecting pin being connect with the second port B2 of buzzer
22.Also that is, the service voltage can be both applied in first port, can also apply on the second port；Both it can pass through
Single port is grounded, and can also be grounded by second port, to change the current direction for flowing through buzzer.Actual application
In, buzzer can be controlled by a variety of suitable modes, so that it is sent out corresponding, variable sound, such as positive half-wave
The mode of control realizes U.S. audio fruit；Or by the positive and negative alternately control between two ports, change the electric current side of buzzer
U.S. audio fruit is realized to (the application port for changing service voltage).
Fig. 2 is the functional block diagram for the buzzer control circuit that another embodiment of the application provides.In the present embodiment, it provides
Alternating control mode based on pwm control signal.As shown in Fig. 2, except adjustment unit 100 shown in FIG. 1 and signal amplify
Outside unit 200, which further includes alternating control unit 300.
The input side of the alternating control unit 300 is the second input terminal 12 for obtaining the second pwm control signal.Its outlet side
It including two connecting pins, is connect respectively with first service voltage connecting pin and the second service voltage connecting pin, to realize
Control for buzzer current direction.
Second pwm control signal can be generated and adjusted by the same equipment with the first pwm control signal, can also be by
Two discrete equipment are generated or are adjusted.Likewise, the second pwm control signal is also, a kind of amplitude is equal, adjustable pulse width
Pulse signal.
The alternating control unit 300 can be changed based on the low and high level of the second pwm control signal to be realized for buzzer
Current direction control (i.e. control apply service voltage port).For example, when the second pwm control signal is high level,
It is grounding ports to make second port, and electric current is flowed into from first port.And the second pwm control signal be low level when, electric current from
Second port flows into, and first port becomes grounding ports.It can specifically be come using a variety of suitable functional circuits
Realize the handoff functionality, e.g., the on-off action based on semiconductor devices or is based on electromagnetism actuating mechanism at the functional circuit of structure
Realize the actuating circuit etc. of handoff functionality.
The alternating control unit 300 provided by above-described embodiment carries out positive and negative alternately control to buzzer both ends and (changes
Become buzzer current direction) mode, with general half positive wave control compared with, can have better control effect.
It in the present embodiment, can be by inputting specific 2nd PWM controls letter during controlling buzzer sounding
Number with formed corresponding sound frequency and by control input the first pwm control signal, adjustment service voltage to control bee
It rings the volume of device, the volume is minimum can be adjusted to 0, i.e. the not state of sounding.
Fig. 3 is the circuit diagram of adjustment unit 100 provided by the embodiments of the present application.In the present embodiment, may include
One DC power supply V1 for providing control circuit operating voltage.The operating voltage that the DC power supply provides specifically can basis
The buzzer used is determined, related to the maximum service voltage of buzzer.If the operating voltage that the DC power supply provides is V1,
The variable range of the service voltage is 0 to (V1-VCE),VCEFor the pressure drop of signal amplification unit.
As shown in figure 3, the adjustment unit 100 includes：First triode Q1, the second triode Q2, first resistor R1, second
Resistance R2,3rd resistor R3, the 4th resistance R4, the 5th resistance R5, the 6th resistance R6 and the first capacitance C1.
Wherein, the first triode Q1, the second triode Q2, second resistance R2,3rd resistor R3, the 4th resistance R4, the 5th
Resistance R5 and the 6th resistance R6 form a switching circuit 110.
The first input end 11 for inputting the first pwm control signal passes through the base of second resistance R2 and the first triode Q1
Pole connects, and is also grounded by 3rd resistor R3.The collector of the first triode Q1 passes through the 5th resistance R5 and the second three-level
The base stage of pipe Q2 connects, and is also connect with the anode of the DC power supply V1 by the 4th resistance R4.The second triode Q2's
Emitter is connect with the anode of the DC power supply V1, and the collector of the second triode Q2 is grounded by the 6th resistance R6,
And form the output end (being connect with the first resistor R1) of the switching circuit.
After the switching circuit 110 receives first pwm control signal, when the first pwm control signal is high level
Second triode Q2 conductings, to be the first capacitance C1 chargings by first resistor R1.
Fig. 4 is the circuit diagram for the adjustment unit 100 that another embodiment of the application provides.As shown in figure 4, the adjustment
Unit 100 includes：6th triode Q6, the 7th triode Q7, the 8th triode Q8, first resistor R1, second resistance R2, third
Resistance R3, the 4th resistance R4 and the first capacitance C1.
Wherein, the 6th triode Q6, the 7th triode Q7, the 8th triode Q8, second resistance R2,3rd resistor R3,
Four resistance R4 form a switching circuit 110.
Input the first input end PWM of the first pwm control signal1Pass through second resistance R2's and the 6th triode Q6
Base stage connects, and is also grounded by 3rd resistor R3.The collector of the 6th triode Q6 and the base stage of the 7th triode Q7 connect
It connects, is also connect with the anode of the DC power supply V1 by the 4th resistance R4.The collector of the 7th triode Q7 with it is described
The anode connection of DC power supply V1, the emitter of the 7th triode Q7 is connect with the emitter of the 8th triode Q8, and shape
At the output end (being connect with the first resistor R1) of the switching circuit.The base stage of the 8th triode Q8 is also with described
The base stage of seven triode Q7 connects, the grounded collector of the 8th triode Q8.
As shown in Figure 3 and Figure 4, in the present embodiment, by the second triode of the positive-negative-positive in switching circuit shown in Fig. 3
The 7th triode of NPN type in Fig. 4 is replaced with, and the 5th resistance R5 is replaced with into the 8th triode Q8.Change as progress
After change, switching circuit 110 shown in Fig. 4 also realize the function similar with Fig. 3 (by change the first capacitance C1 voltage come
Change the control electric current of output).But adjusting unit as shown in figure 3 is different to be, in the present embodiment, with the first PWM
The increase of signal dutyfactor is controlled, control electric current will be reduced.
It can be realized according to the duty ratio of pwm control signal for opening in Fig. 3 or shown in Fig. 4 switching circuits 110
The control of the turn-on time on powered-down road, so as to adjust the voltage on the first capacitance C1.Wherein, the frequency of the first pwm control signal
Related to the first capacitance C1, i.e., for specific capacitance, too low PWM frequency may cannot be satisfied normally
It uses.In general, when the capacitance of the first capacitance C1 is 100nf, the frequency of PWM, which is more than 20KHz, to be met the requirements.
In some embodiments, it is also possible to using other similar with Fig. 3 or switching circuit shown in Fig. 4, including
The functional circuit of the switch element of several level changes with pwm control signal and switched conductive or cut-off state, such as Fig. 3 and
Shown in Fig. 4, equivalence replacement one or more of which thyristor is to change the direction of control.In other realities
It applies in example, either economization can also be added according to actual conditions or replaces some discrete elements or functional circuit.Using
Other common triode connection types or common switching circuit type, the switching circuit is replaced, adjust or
The improved technical solution of person is well-known to those skilled in the art, need not make the creative labor and can be obtained.
Please continue to refer to Fig. 3 and Fig. 4, in the embodiment of the present application, the output end of the switching circuit and first electricity
Hinder the connection of the one end R1.The other end of the first resistor R1 passes through the first capacitance C1 ground connection；The electricity of the first capacitance C1 and first
The connecting pin of resistance R1 forms the control electric current IcontrolOutput end.
Wherein, in the embodiment shown in fig. 3, the second triode Q2 with the first pwm control signal of input duty
The time of conducting is extended than increase.In the second triode Q2 conductings, charged to the first capacitance C1 by first resistor R1；
In the second triode Q2 cut-offs, the first capacitance C1 electric discharges.Thus, it is possible to according to the turn-on time tune of the second triode Q2
Whole control electric current IcontrolSize.And in the embodiment shown in fig. 4, the second triode Q2 of positive-negative-positive is changed to NPN type
7th triode Q7.On and off situation between the 7th triode Q7 and the second triode Q2 is opposite.
In some embodiments, the signal amplification unit 200 is formed by third transistor Q3 and the 7th resistance R7.Institute
The base stage for stating third transistor Q3 is connect with the output end of the control electric current, also passes through the 7th resistance R7 ground connection.Also, it is described
The collector of third transistor Q3 is connect with the anode of the DC power supply V1, and the emitter voltage of the third transistor Q3 is
The service voltage of buzzer.
As shown in Figure 3 and Figure 4, the emitter voltage (i.e. the service voltage of buzzer) of the third transistor Q3 is with it
Electric current (controlling electric current) in base stage and change.As a result, by the signal amplification unit, the control electric current can be passed through
Size adjusts the service voltage of the buzzer.It is other suitable specifically to use, and can pass through small current/voltage
The variation driving signal amplification unit that significantly current/voltage changes.It is well-known to those skilled in the art to be, it can basis
The needs of actual conditions, adjustment are added, the resistive discrete component in economization or replacement circuit.
In some embodiments, in the case that the adjustment unit 100 can directly export the signal that can be used, such as
The adjustment unit 100 follows change in duty cycle directly according to the change in duty cycle of the first pwm control signal in outlet side output
Service voltage, can also signal amplification unit 200 described in economization.Can " voltage-regulating circuit " indicate that economization signal is put
Adjustment unit 100 in the embodiment of big unit 200, to distinguish the adjustment unit 100 in other embodiments.
Fig. 5 is provided by the embodiments of the present application, can directly export the voltage tune for the service voltage for following change in duty cycle
The circuit diagram of whole circuit.
As shown in figure 5, the voltage-regulating circuit includes：Thirteenth resistor R51, the 14th resistance R52, the second capacitance
C51, the 15th resistance R53, the 16th resistance R54, the 17th resistance R55 and amplifier (i.e. operational amplifier) U1.
The first input end 11 for inputting the first pwm control signal is connect with one end of the 16th resistance R54, the 16th resistance
The other end of R54 is grounded by the thirteenth resistor R51, also passes through the positive input of the 17th resistance R55 and amplifier U1
Connection.The reverse input end of the amplifier U1 also passes through the 15th resistance R53 and amplifier U1 by the 14th resistance R52 ground connection
Output end connection, the output end of the amplifier U1 forms the signal outlet side, and output follows the supply electricity of change in duty cycle
Pressure.
In the embodiment shown in fig. 5, the circuit structure without containing switch element is used, by the direct basis of the amplifier
The variation of the duty ratio for the first pwm control signal that first input end 11 inputs is amplified, and duty is followed in output end formation
The service voltage changed than variation.
The amplifier specifically can select suitable integrated transporting discharging (the integrated transporting discharging core of such as specific model according to actual conditions
Piece) or be made of discrete component, functional circuit with the same function.In some embodiments, which can be collection
At amplifier.
Fig. 6 is the circuit diagram of alternately control unit provided by the embodiments of the present application.The alternating control unit respectively with
The first port B1 of buzzer is connected with second port B2, changes bee according to the level change situation of the second pwm control signal
The current direction of ring device.Change the buzzer port of ground connection.
As shown in fig. 6, the alternately control unit 300 includes：4th triode Q4, the 5th triode Q5, the 8th resistance
R8, the 9th resistance R9, the tenth resistance R10, eleventh resistor R11 and twelfth resistor R12.
Wherein, second input terminal 12 is connect with the one end the 8th resistance R8, inputs the second pwm control signal.Institute
The other end of the 8th resistance R8 is stated by the 9th resistance R9 ground connection, is also connect with the base stage of the 4th triode Q4.Described 4th 3
The emitter of pole pipe Q4 is grounded, and the collector of the 4th triode Q4 passes through twelfth resistor R12's and the 5th triode Q5
Base stage connects, the emitter ground connection of the 5th triode Q5.
The collector of the 4th triode Q4 is connect by the tenth resistance R10 with first service voltage connecting pin,
Also it is connect with the first port B1 of buzzer；The collector of the 5th triode Q5 passes through eleventh resistor R11 and described the
Two service voltage connecting pins connect, and are also connect with the second port B2 of buzzer.
In the present embodiment, buzzer first port and are provided by the 4th triode Q4 and the 5th triode Q5 respectively
The earth-return circuit of Two-port netwerk.Thus, it is possible to by control the 4th triode Q4 and the 5th triode Q5 working condition (cut-off/
Conducting) come change change buzzer current direction.
For example, when the second pwm control signal is high level, Q5 sections of the 4th triode Q4 conductings and the 5th triode
Only, the supply electric current of buzzer is by eleventh resistor R11, and buzzer is flowed into from the second port B2 of buzzer, and from buzzing
The first port B1 outflows of device, pass through the 4th triode Q4 to ground.And when the second pwm control signal is low level, the four or three
Pole pipe Q4 cut-offs and the 5th triode Q5 conductings, the supply electric current of buzzer is by the tenth resistance R10, from the first of buzzer
Port B1 flows into buzzer, and is flowed out from second port B2, passes through the 5th triode Q5 to ground.
It, can be with when inputting the second pwm control signal based on the on-off action of the 4th triode Q4 and the 5th triode Q5
It realizes that the positive and negative of buzzer alternately controls, there is preferably U.S. audio fruit.
It is other suitable specifically to use, and the element with on-off action realizes above-mentioned alternately control unit 300
Function.I.e. the circuit can be respectively that first port B1 and second port B2 provide two independent earth-return circuits (such as first
Earth-return circuit, the second earth-return circuit), there is on two earth-return circuits the corresponding element for playing on-off action.Such switch
The element of effect is interrelated, another earth-return circuit is closed while when operation keeps one of earth-return circuit to be connected, and
And according to the conduction and cut-off situation that can switch earth-return circuit according to the variation of pwm control signal.Certainly, in some implementations
Can also be using a switch element, while the conduction and cut-off of two earth-return circuits of control in example.
Application embodiment as above provide buzzer control circuit when, can specifically realize by the following method it is various not
With U.S. audio fruit.For example, when adjusting volume, can be inputted and the sound frequency corresponding second of needs in the second input terminal
Pwm control signal, and by controlling the duty ratio of the first pwm control signal inputted in first input end to change buzzer
Volume either when needing to form the effect that sound is fade-in, can input the sound audio with needs in the second input terminal
Corresponding second pwm control signal of rate, and within the regular hour (can determines according to actual conditions or adjustment), by first
The duty ratio of pwm control signal increases to the corresponding duty ratio of target volume to realize that the sound of buzzer is fade-in from minimal linear
Effect, or be that, when needing to form the effect that sound gradually goes out, the sound frequency with needs can be inputted in the second input terminal
Corresponding second pwm control signal, and within the regular hour, the duty ratio of the first pwm control signal is linearly reduced to 0 with
Realize that the sound of buzzer gradually goes out effect.
The foregoing is merely presently filed embodiments, are not intended to limit the scope of the claims of the application, every to utilize this
Equivalent structure or equivalent flow shift made by application specification and accompanying drawing content, it is relevant to be applied directly or indirectly in other
Technical field includes similarly in the scope of patent protection of the application.
Claims (14)
1. a kind of buzzer control circuit, which is characterized in that including：
First input end for inputting the first pwm control signal；
According to the first pwm control signal of input, the voltage-regulating circuit of the service voltage of buzzer is adjusted；
The voltage-regulating circuit has the first service voltage connecting pin being connect with the first port of buzzer and and buzzing
Second service voltage connecting pin of the second port connection of device；
The second input terminal for inputting the second pwm control signal；
The alternating control unit being connect with first service voltage connecting pin and the second service voltage connecting pin；The alternating
Control unit changes the current direction for flowing through buzzer according to the level change of second pwm control signal.
2. control circuit according to claim 1, which is characterized in that the voltage-regulating circuit includes：At least one fortune
Calculate amplifier；
The first pwm control signal that the operational amplifier is inputted according to its positive input exports corresponding in its output end
The service voltage of buzzer；
Output end connection first service voltage connecting pin of the operational amplifier and the second service voltage connecting pin.
3. control circuit according to claim 2, which is characterized in that the voltage-regulating circuit includes：Thirteenth resistor,
14th resistance, the second capacitance, the 15th resistance, the 16th resistance, the 17th resistance and operational amplifier；
The first input end for inputting the first pwm control signal is connect with one end of the 16th resistance, the other end of the 16th resistance
It is grounded by the thirteenth resistor, is also connect with the positive input of the operational amplifier by the 17th resistance；
The reverse input end of the operational amplifier is also put by the 15th resistance with the operation by the 14th resistance eutral grounding
The output end connection of big device.
4. control circuit according to claim 1, which is characterized in that the voltage-regulating circuit includes：
According to the first pwm control signal of input, the adjustment unit of corresponding control electric current is exported, the control current following the
The duty ratio of one pwm control signal changes and changes；And according to the control electric current, adjust the letter of the service voltage of buzzer
Number amplifying unit.
5. control circuit according to claim 4, which is characterized in that the adjustment unit includes：
It is connected when first pwm control signal is high level, ends when first pwm control signal is low level
Switching circuit；
The first resistor being connect with the output end of the switching circuit；And
When the switching circuit is connected, the first capacitance for being charged by the first resistor, wherein on first capacitance
Voltage determines the control electric current.
6. control circuit according to claim 4, which is characterized in that the control circuit further includes：Control circuit is provided
The DC power supply of operating voltage.
7. control circuit according to claim 6, which is characterized in that the switching circuit includes：First triode, second
Triode, second resistance, 3rd resistor, the 4th resistance, the 5th resistance and the 6th resistance；
The first input end is connect by second resistance with the base stage of first triode, is also grounded by 3rd resistor；
The collector of first triode is connect by the 5th resistance with the base stage of second triode, also by the 4th resistance with
The anode connection of the DC power supply；The anode of the emitter of second triode and the DC power supply is connect, and described the
The collector of two triodes forms the output end of the switching circuit by the 6th resistance eutral grounding.
8. control circuit according to claim 6, which is characterized in that the switching circuit includes：6th triode, the 7th
Triode, the 8th triode, second resistance, 3rd resistor, the 4th resistance；
The first input end for inputting the first pwm control signal is connect by second resistance with the base stage of the 6th triode, also
It is grounded by 3rd resistor；The collector of 6th triode is connect with the base stage of the 7th triode, also passes through the 4th
Resistance is connect with the anode of the DC power supply；The collector of 7th triode is connect with the anode of the DC power supply,
The emitter of 7th triode is connect with the emitter of the 8th triode, and forms the output end of the switching circuit；
The base stage of 8th triode is also connect with the base stage of the 7th triode, and the collector of the 8th triode connects
Ground.
9. according to any control circuits of claim 5-8, which is characterized in that described first resistor one end and the switch
The output end of circuit connects, and the other end of first resistor passes through the first capacity earth；First capacitance and the first resistor
Connecting pin formed it is described control electric current output end.
10. control circuit according to claim 6, which is characterized in that the signal amplification unit includes：Third transistor
And the 7th resistance；
The base stage of the third transistor is connect with the output end of the control electric current, also passes through the 7th resistance eutral grounding；Described
The collector of three triodes is connect with the anode of the DC power supply；The emitter voltage of the third transistor is buzzer
Service voltage.
11. control circuit according to claim 10, which is characterized in that the third transistor of the signal amplification unit
Emitter connects first service voltage connecting pin and the second service voltage connecting pin.
12. according to any control circuits of claim 1-8, which is characterized in that the alternately control unit includes：Alternately
The first earth-return circuit and the second earth-return circuit of on and off；
First earth-return circuit is connect with first service voltage connecting pin；Second earth-return circuit is supplied with described second
It is connected to voltage connection；
When second pwm control signal is high level, the conducting of the first earth-return circuit and the cut-off of the second earth-return circuit are described
Service voltage is applied to the first port of buzzer；
When second pwm control signal is low level, the cut-off of the first earth-return circuit and the conducting of the second earth-return circuit are described
Service voltage is applied to the second port of buzzer.
13. according to any control circuits of claim 1-8, which is characterized in that the alternately control unit includes：4th
Triode, the 5th triode, the 8th resistance, the 9th resistance, the tenth resistance, eleventh resistor and twelfth resistor；
Second input terminal is connect with described 8th resistance one end, and the other end of the 8th resistance is connect by the 9th resistance
Ground is also connect with the base stage of the 4th triode；The emitter of 4th triode is grounded, the collector of the 4th triode
It is connect with the base stage of the 5th triode by twelfth resistor, the emitter ground connection of the 5th triode；
The collector of 4th triode is connect by the tenth resistance with first service voltage connecting pin, and also and buzzer
First port connection；
The collector of 5th triode is connect by eleventh resistor with second service voltage connecting pin, and also and buzzing
The second port of device connects.
14. a kind of buzzer, which is characterized in that including sound-producing device, pwm signal generating means and as claim 1-13 appoints
Buzzer control circuit described in one；
The pwm signal generating means are connect with the buzzer control circuit, export scheduled pwm control signal to the bee
Ring device control circuit；The buzzer control circuit is connect with the sound-producing device, exports corresponding voltage signal to the hair
Acoustic device.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2017/101968 WO2019051815A1 (en) | 2017-09-15 | 2017-09-15 | Control circuit for buzzer, and buzzer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN108780636A true CN108780636A (en) | 2018-11-09 |
Family
ID=64034070
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201780008994.3A Pending CN108780636A (en) | 2017-09-15 | 2017-09-15 | Buzzer control circuit and buzzer |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN108780636A (en) |
| WO (1) | WO2019051815A1 (en) |
Cited By (1)
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|---|---|---|---|---|
| CN111710323A (en) * | 2020-05-19 | 2020-09-25 | 深圳南云微电子有限公司 | Buzzer control method and control circuit thereof |
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|---|---|---|---|---|
| US20220273409A1 (en) | 2019-09-12 | 2022-09-01 | 3M Innovative Properties Company | Apparatus, System, Method of Post-Curing an Article, and Post-Cured Article |
| US11402265B2 (en) | 2019-11-05 | 2022-08-02 | Texas Instruments Incorporated | Apparatus for integrated offset voltage for photodiode current amplifier |
| US11361644B2 (en) * | 2019-12-18 | 2022-06-14 | Texas Instruments Incorporated | Duty cycle tuning in self-resonant piezo buzzer |
| US11468756B2 (en) | 2020-04-02 | 2022-10-11 | Texas Instruments Incorporated | Integrated circuit for smoke detector having compatibility with multiple power supplies |
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| CN102291646A (en) * | 2011-07-01 | 2011-12-21 | 上海富士施乐有限公司 | Volume control circuit of piezoelectric buzzer |
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| CN102291646A (en) * | 2011-07-01 | 2011-12-21 | 上海富士施乐有限公司 | Volume control circuit of piezoelectric buzzer |
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| CN202996285U (en) * | 2012-12-29 | 2013-06-12 | 佛山市顺德区瑞德电子实业有限公司 | Sweet sound buzzer circuit |
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Also Published As
| Publication number | Publication date |
|---|---|
| WO2019051815A1 (en) | 2019-03-21 |
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