CN211555457U - Buzzer driving circuit and electronic equipment - Google Patents
Buzzer driving circuit and electronic equipment Download PDFInfo
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- CN211555457U CN211555457U CN201922131117.4U CN201922131117U CN211555457U CN 211555457 U CN211555457 U CN 211555457U CN 201922131117 U CN201922131117 U CN 201922131117U CN 211555457 U CN211555457 U CN 211555457U
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Abstract
The embodiment of the utility model provides a buzzer drive circuit and electronic equipment is provided in buzzer drive field, include: a controller electrically connected to an external power supply; the first end of the buzzer is electrically connected with the controller; the first end of the switch circuit is electrically connected with the controller, the second end of the switch circuit is electrically connected with the second end of the buzzer, and the switch circuit is used for working in a conducting state or a switching-off state according to a level signal sent by the controller; the voltage doubling circuit is characterized in that a first end of the voltage doubling circuit is electrically connected with an external power supply, a second end of the voltage doubling circuit is electrically connected with a second end of the switch circuit, a third end of the voltage doubling circuit is electrically connected with a third end of the switch circuit, and is used for outputting driving voltage when the switch circuit works in a turn-off state, outputting discharge voltage when the switch circuit works in a turn-on state, and outputting the driving voltage and the discharge voltage according to preset frequency so as to drive the buzzer to emit buzzing sound. The embodiment of the utility model provides a single power supply is supported.
Description
[ technical field ] A method for producing a semiconductor device
The embodiment of the utility model provides a buzzer drive circuit and electronic equipment are related to especially to in buzzer drive field.
[ background of the invention ]
The existing buzzer driving circuit comprises a controller and a buzzer, and when the buzzer works normally, the power supply voltage of the buzzer is higher than that of the controller, so that double power supplies are needed to be adopted to respectively supply power to the buzzer and the controller.
[ Utility model ] content
The embodiment of the utility model provides a aim at providing a buzzer drive circuit and electronic equipment, it can support single power supply.
In order to solve the above technical problem, an embodiment of the present invention provides the following technical solution:
the embodiment of the utility model provides a buzzer drive circuit, include:
a controller electrically connected to an external power supply;
the first end of the buzzer is electrically connected with the controller;
the first end of the switch circuit is electrically connected with the first end of the buzzer and the controller, the second end of the switch circuit is electrically connected with the second end of the buzzer, and the switch circuit is used for working in a conducting state or a switching-off state according to a level signal sent by the controller;
voltage doubling circuit, voltage doubling circuit's first end with external power source electricity is connected, voltage doubling circuit's second end with switching circuit's second end with buzzer's second end electricity is connected, voltage doubling circuit's third end with switching circuit's third end electricity is connected, voltage doubling circuit is used for when switching circuit work is when the off-state, exports drive voltage, works as switching circuit work is when the on-state, exports discharge voltage, according to predetermineeing frequency output drive voltage with discharge voltage, in order to drive buzzer sends the sound of singing.
Optionally, the voltage doubling circuit comprises:
the charging and discharging circuit is respectively and electrically connected with the external power supply, the second end of the switch circuit and the third end of the switch circuit;
and the pull-up circuit is electrically connected with the external power supply, the charging and discharging circuit and the third end of the switch circuit respectively.
Optionally, the charge and discharge circuit includes a switching diode, a capacitor, and a first resistor;
the anode of the switch diode is connected with the external power supply and one end of the pull-up circuit, and the cathode of the switch diode is connected with one end of the capacitor and one end of the first resistor;
the other end of the capacitor is connected with the other end of the pull-up circuit and the third end of the switch circuit;
the other end of the first resistor is connected with the second end of the buzzer and the second end of the switch circuit.
Optionally, the pull-up circuit includes a second resistor, one end of the second resistor is connected to the external power source and the anode of the switching diode, and the other end of the second resistor is connected to the other end of the capacitor and the third end of the switching circuit.
Optionally, the switching circuit comprises:
the first switch circuit is respectively and electrically connected with the controller, the first end of the buzzer and the third end of the voltage doubling circuit;
and the second switch circuit is respectively and electrically connected with the controller, the first end of the buzzer, the second end of the buzzer and the second end of the voltage doubling circuit.
Optionally, the first switch circuit includes a third resistor and a first NPN transistor;
one end of the third resistor is connected with the controller, the first end of the buzzer and the second switch circuit, and the other end of the third resistor is connected with the base electrode of the first NPN triode;
and the collector of the first NPN triode is connected with the third end of the voltage doubling circuit, and the emitter of the first NPN triode is grounded.
Optionally, the second switch circuit includes a fourth resistor and a second NPN transistor;
one end of the fourth resistor is connected with the controller, one end of the third resistor and the first end of the buzzer, and the other end of the fourth resistor is connected with the base electrode of the second NPN triode;
and the collector of the second NPN triode is electrically connected with the second end of the buzzer and the second end of the voltage doubling circuit, and the emitter of the second NPN triode is grounded.
Optionally, the buzzer driving circuit further comprises a current limiting circuit electrically connected between the controller and the first end of the buzzer.
Optionally, the current limiting circuit includes a fifth resistor, one end of the fifth resistor is connected to the controller, and the other end of the fifth resistor is connected to the first end of the buzzer.
The embodiment of the utility model provides an electronic equipment is still provided, include as above arbitrary bee calling organ drive circuit.
The utility model has the advantages that: compared with the prior art, the embodiment of the utility model provides a buzzer drive circuit and electronic equipment. Through the level signal that switch circuit sent according to the controller, work is at on-state or off-state, and voltage doubling circuit when switch circuit work is when the off-state, output drive voltage, when switch circuit work is when the on-state, output discharge voltage according to preset frequency output drive voltage and discharge voltage to drive bee calling organ sends the buzzing sound, consequently, the embodiment of the utility model provides a make single external power source both can provide the power for the controller, also can provide the power for bee calling organ.
[ description of the drawings ]
One or more embodiments are illustrated by way of example in the accompanying drawings, which correspond to the figures in which like reference numerals refer to similar elements and which are not to scale unless otherwise specified.
Fig. 1 is a schematic structural diagram of a buzzer driving circuit provided in an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a buzzer driving circuit according to another embodiment of the present invention;
fig. 3 is a schematic circuit connection diagram of a buzzer driving circuit provided in an embodiment of the present invention.
[ detailed description ] embodiments
To facilitate an understanding of the present application, the present application is described in more detail below with reference to the accompanying drawings and detailed description. It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may be present. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In addition, the technical features mentioned in the different embodiments of the present application described below may be combined with each other as long as they do not conflict with each other.
The embodiment of the utility model provides an electronic equipment, electronic equipment includes following arbitrary embodiment buzzer drive circuit.
The electronic equipment comprises a telephone, a printer, an electronic toy, a timer, a washing machine, a microwave oven, an electric cooker and the like, and is used for sending out buzzing sound through the buzzer driving circuit when preset conditions are met, preset time is reached or a trigger signal is received so as to prompt a user about the equipment state, the working state and the like of the electronic equipment. For example, the electronic device comprises a pulsator washing machine, and when clothes are placed beyond the highest water level line of the pulsator washing machine, a buzzer with preset frequency is sent out through the buzzer driving circuit to prompt a user to place the clothes beyond the highest water level line of the pulsator washing machine; when the washing of the pulsator washing machine is finished, the buzzer driving circuit sends out buzzing sound with another preset frequency to prompt a user that the washing of the pulsator washing machine is finished.
The embodiment of the utility model provides a pair of electronic equipment can realize buzzer drive circuit's single power supply. For details that are not described in detail in this embodiment, reference may be made to circuit embodiments provided in the embodiments of the present invention.
Please refer to fig. 1, which is a schematic structural diagram of a buzzer driving circuit according to an embodiment of the present invention. As shown in fig. 1, the buzzer driving circuit 100 includes a controller 10, a buzzer 20, a switching circuit 30, and a voltage-doubler circuit 40.
The controller 10 is electrically connected to an external power source.
Referring to fig. 3, the controller 10 includes a single chip microcomputer U1, and the single chip microcomputer U1 includes a power pin VDD, a ground pin GND, and an input/output pin I O. The power supply pin VDD is connected to the external power supply and configured to receive a power supply voltage provided by the external power supply, the power supply voltage is a working voltage of the single chip microcomputer U1, and the input/output pin I O is connected to the buzzer 20 and the switch circuit 30.
The single chip microcomputer U1 can adopt 51 series, Ardu i no series, STM32 series and the like. In some embodiments, the controller 23 may also be a general purpose processor, a Digital Signal Processor (DSP), an application specific integrated circuit (AS ic), a Field Programmable Gate Array (FPGA), an arm (acorn RI SC Mach I ne), or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination of these components; but in the alternative, the processor may be any conventional processor, controller, microcontroller, or state machine; or as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.
In this embodiment, only one of the input/output pins I O of the single chip microcomputer U1 needs to be used, I/O resources of the single chip microcomputer U1 are not increased, and a cheaper single chip microcomputer U1 meeting conditions can be selected in a simple circuit, so that the circuit design cost is reduced.
A first end of the buzzer 20 is electrically connected to the controller 10.
In this embodiment, the buzzer 20 is a piezoelectric buzzer. The piezoelectric buzzer is an electroacoustic conversion device, a piezoelectric material is adhered to a metal sheet, and when a voltage is applied to two ends of the piezoelectric material and the metal sheet, the piezoelectric buzzer generates mechanical deformation to make a sound due to the piezoelectric effect. Piezoelectric buzzers are generally circular and consist of a piezoelectric ceramic plate, a lead wire and a resonance cavity, wherein the piezoelectric ceramic plate comprises a metal coating, a ceramic plate, glue and a metal sheet.
In some embodiments, the piezo buzzer further comprises a light emitting diode to further alert the user.
As shown in fig. 3, the buzzer 20 includes a piezoelectric buzzer BUZ1, a first end of the piezoelectric buzzer BUZ1 is connected to an input/output pin I O of the single chip microcomputer U1 and a first end of the switch circuit 30, and a second end of the piezoelectric buzzer BUZ1 is connected to a second end of the switch circuit 30 and a second end of the voltage-doubling circuit 40. When the voltage between the first end of the piezoelectric buzzer BUZ1 and the two ends of the second end of the piezoelectric buzzer BUZ1 changes according to the preset frequency, namely the piezoelectric buzzer BUZ1 sends out a buzzing sound under the action of a square wave signal with the preset frequency.
The first end of the switch circuit 30 is electrically connected to the first end of the buzzer 20 and the controller 10, the second end of the switch circuit 30 is electrically connected to the second end of the buzzer 20, and the switch circuit 30 is configured to operate in an on state or an off state according to a level signal sent by the controller 10.
Referring to fig. 2, the switch circuit 30 includes a first switch circuit 301 and a second switch circuit 302.
The first switch circuit 301 is electrically connected to the controller 10, the first terminal of the buzzer 20, and the third terminal of the voltage doubling circuit 40, respectively.
In this embodiment, the first switch circuit 301 includes a third resistor R3 and a first NPN transistor Q1.
One end of the third resistor R3 is connected to the input/output pin I O of the single-chip microcomputer U1, the first end of the piezoelectric buzzer BUZ1, and the second switch circuit 302, and the other end of the third resistor R3 is connected to the base of the first NPN triode Q1; the collector of the first NPN transistor Q1 is connected to the third terminal of the voltage doubling circuit 40, and the emitter of the first NPN transistor Q1 is grounded.
Specifically, when an input/output pin IO of the single chip microcomputer U1 outputs a high level signal, the high level signal reaches a base of the first NPN triode Q1 through the third resistor R3, an emitter of the first NPN triode Q1 is grounded, so as to satisfy a conduction condition of the first NPN triode Q1, and the first NPN triode Q1 is turned on; when the input/output pin IO of the single chip microcomputer U1 outputs a low level signal, the low level signal reaches the base of the first NPN transistor Q1 through the third resistor R3, and the first NPN transistor Q1 is turned off when the on condition of the first NPN transistor Q1 is not satisfied.
The second switch circuit 302 is electrically connected to the controller 10, the first end of the buzzer 20, the second end of the buzzer 20, and the second end of the voltage doubling circuit 40, respectively.
In this embodiment, the second switch circuit 302 includes a fourth resistor R4 and a second NPN transistor Q2.
One end of the fourth resistor R4 is connected to the input/output pin I O of the single-chip microcomputer U1, one end of the third resistor R3, and the first end of the piezoelectric buzzer BUZ1, and the other end of the fourth resistor R4 is connected to the base of the second NPN triode Q2; the collector of the second NPN triode Q2 is electrically connected to the second terminal of the piezoelectric buzzer BUZ1 and the second terminal of the voltage doubling circuit 40, and the emitter of the second NPN triode Q2 is grounded.
Specifically, when an input/output pin IO of the single chip microcomputer U1 outputs a high level signal, the high level signal reaches a base of the second NPN triode Q2 through the fourth resistor R4, an emitter of the second NPN triode Q2 is grounded, so as to meet a conduction condition of the second NPN triode Q2, and the second NPN triode Q2 is turned on; when the input/output pin IO of the single chip microcomputer U1 outputs a low level signal, the low level signal reaches the base of the second NPN transistor Q2 through the fourth resistor R4, and the second NPN transistor Q2 is turned off when the on condition of the second NPN transistor Q2 is not satisfied.
It is understood that an intersection point of one end of the third resistor R3 and one end of the fourth resistor R4 is a first end of the switch circuit 30, a collector of the second NPN transistor Q2 is a second end of the switch circuit 30, and a collector of the first NPN transistor Q1 is a third end of the switch circuit 30.
The first end of the voltage doubling circuit 40 is electrically connected with the external power supply, the second end of the voltage doubling circuit 40 is electrically connected with the second end of the switch circuit 30 and the second end of the buzzer 20, the third end of the voltage doubling circuit 40 is electrically connected with the third end of the switch circuit 30, the voltage doubling circuit 40 is used for outputting a driving voltage when the switch circuit 30 works in an off state, outputting a discharging voltage when the switch circuit 30 works in an on state, and outputting the driving voltage and the discharging voltage according to a preset frequency so as to drive the buzzer 20 to emit a buzzer.
As shown in fig. 2, the voltage doubler circuit 40 includes a charge and discharge circuit 401 and a pull-up circuit 402.
The charge and discharge circuit 401 is electrically connected to the external power supply, the second terminal of the switch circuit 30, and the third terminal of the switch circuit 30, respectively.
As shown in fig. 3, the charging and discharging circuit 401 includes a switching diode D1, a capacitor C1, and a first resistor R1.
Wherein an anode of the switching diode D1 is connected to the external power source and one end of the pull-up circuit 402, and a cathode of the switching diode D1 is connected to one end of the capacitor C1 and one end of the first resistor R1; the other end of the capacitor C1 is connected to the other end of the pull-up circuit 402 and the third end of the switch circuit 30; the other end of the first resistor R1 is connected with the second end of the piezoelectric buzzer BUZ1 and the second end of the switch circuit 30.
The pull-up circuit 402 is electrically connected to the external power supply, the charge/discharge circuit 401, and a third terminal of the switch circuit 30, respectively.
The pull-up circuit 402 includes a second resistor R2, one end of the second resistor R2 is connected to the external power source and the anode of the switching diode D1, and the other end of the second resistor R2 is connected to the other end of the capacitor C1 and the third end of the switching circuit 30.
It is understood that an intersection point of an anode of the switching diode D1 and one end of the second resistor R2 is a first end of the voltage doubling circuit 40, the other end of the first resistor R1 is a second end of the voltage doubling circuit 40, and an intersection point of the other end of the capacitor C1 and the other end of the second resistor R2 is a third end of the voltage doubling circuit 40.
When the buzzer driving circuit 100 is just powered on, the controller 10 sends a first level signal, the switch circuit 30 works in an off state, the third end of the voltage doubling circuit 40 is equal to the fourth end of the voltage doubling circuit 40 in potential, and the voltage doubling circuit 40 does not work; then, the controller 10 sends a second level signal, the switch circuit 30 operates in a conducting state, and the external power source charges the voltage doubling circuit 40 until the voltage doubling circuit 40 is fully charged.
Subsequently, the buzzer driving circuit 100 enters a normal working cycle, and in one working cycle of the buzzer driving circuit 100, the controller 10 sends the first level signal, the switch circuit 30 works in an off state, so that the voltage at the third terminal of the voltage doubling circuit 40 is equal to the power supply voltage, and then the voltage at the fourth terminal of the voltage doubling circuit 40 is equal to the driving voltage, and the driving voltage is used for supplying power to the buzzer 20; then, the controller 10 sends the second level signal, the switch circuit 30 operates in a conducting state, the voltage doubling circuit 40 discharges through the switch circuit 30 until the voltage at the second end of the buzzer 20 is equal to the discharge voltage, and the external power supply charges the voltage doubling circuit 40 until the voltage at the fourth end of the voltage doubling circuit 40 is equal to the power supply voltage; and repeating the working period, and outputting the driving voltage and the discharging voltage according to a preset frequency so as to drive the buzzer to generate a buzzing sound.
The first level signal is a low level signal, and the second level signal is a high level signal.
In summary, the operation of the buzzer driving circuit 100 is as follows:
when the power is turned on, the single chip microcomputer U1 does not give a level signal, at this time, the level signal of the input/output pin I O of the single chip microcomputer U1 is equivalent to a low level, the low level signal reaches the base of the first NPN triode Q1 through the third resistor R3 respectively, the on condition of the first NPN triode Q1 is not satisfied, the first NPN triode Q1 is turned off, the low level signal reaches the base of the second NPN triode Q2 through the third resistor R4, the on condition of the second NPN triode Q2 is not satisfied, the second NPN triode Q2 is turned off, at this time, potentials at two ends of the capacitor C1 are equal, that is, the capacitor C1 is not charged and discharged, and VP is VN.
Then, the single chip microcomputer U1 sends a high level signal to the first NPN transistor Q1 and the second NPN transistor Q2, the conduction conditions of the first NPN transistor Q1 and the second NPN transistor Q2 are satisfied, the first NPN transistor Q1 and the second NPN transistor Q2 both operate in a conduction state, the collector voltage of the first NPN transistor Q1 is pulled low, at this time, the external power supply VDD charges the capacitor C1 through the switching diode D1 until the capacitor C1 is fully charged, and if the voltage drop of the switching diode D1 is not considered, the P-point voltage VP is VDD, and VP-VN is VDD.
Subsequently, the single chip microcomputer U1 sends a low level signal to the first NPN transistor Q1 and the second NPN transistor Q2, the conduction condition of the first NPN transistor Q1 and the second NPN transistor Q2 is not satisfied, the first NPN transistor Q1 and the second NPN transistor Q2 both operate in an off state, at this time, the voltage at the point N instantaneously rises to VDD, that is, VN equals VDD, and if the voltage drop of the switching diode D1 is not considered, VP equals 2 equals VDD, so that 2 equals VDD is the driving voltage of the piezoelectric buzzer BUZ1, and the voltage at 2 equals VDD passes through the first resistor R1, the second end of the piezoelectric buzzer BUZ1, the first end of the piezoelectric buzzer BUZ1, the input/output pin I O of the single chip microcomputer U1, and finally reaches the ground pin GND of the single chip microcomputer U1.
Then, the single chip microcomputer U1 sends a high level signal to the first NPN transistor Q1 and the second NPN transistor Q2, so as to satisfy the conduction condition of the first NPN transistor Q1 and the second NPN transistor Q2, the first NPN transistor Q1 and the second NPN transistor Q2 both operate in a conduction state, at this time, the voltage of the first end of the piezoelectric buzzer BUZ1 (equal to the voltage at the P point equal to 2 × VDD) is discharged to the ground through the second NPN transistor Q2, and a discharge voltage is output, the discharge voltage is equal to 0V, and meanwhile, as the first NPN transistor Q1 is turned on, the external power supply charges the capacitor C1 through the switching diode D1.
Then, the single chip microcomputer U1 repeatedly sends a low level signal and a high level signal to the first NPN transistor Q1 and the second NPN transistor Q2, and the driving voltage 2 × VDD and the discharging voltage 0V are varied according to a preset frequency (corresponding to a square wave signal of the preset frequency) to drive the piezoelectric buzzer BUZ1 to generate a buzzer sound.
Referring to fig. 2 and 3 again, the buzzer driving circuit 200 further includes a current limiting circuit 50, and the current limiting circuit 50 is electrically connected between the controller 10 and the first end of the buzzer 20.
The current limiting circuit 50 comprises a fifth resistor R5, one end of the fifth resistor R5 is connected with an input/output pin IO of the single chip microcomputer U1, and the other end of the fifth resistor R5 is connected with a first end of the piezoelectric buzzer BUZ 1.
The embodiment of the utility model provides a buzzer drive circuit, the level signal who sends according to the controller through switch circuit, work is at on-state or off-state, and voltage doubling circuit works when switch circuit work is when the off-state, and output drive voltage when switch circuit work is when the on-state, and output discharge voltage is according to predetermineeing frequency output drive voltage and discharge voltage to drive buzzer and send the buzzing, consequently, the embodiment of the utility model provides a make single external power source both can provide the power for the controller, also can provide the power for buzzer. Meanwhile, one path of power supply circuit is reduced, so that the circuit structure is simplified, and the design cost of the circuit is reduced.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; within the idea of the invention, also technical features in the above embodiments or in different embodiments can be combined, steps can be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention.
Claims (10)
1. A buzzer driving circuit, comprising:
a controller electrically connected to an external power supply;
the first end of the buzzer is electrically connected with the controller;
the first end of the switch circuit is electrically connected with the first end of the buzzer and the controller, the second end of the switch circuit is electrically connected with the second end of the buzzer, and the switch circuit is used for working in a conducting state or a switching-off state according to a level signal sent by the controller;
voltage doubling circuit, voltage doubling circuit's first end with external power source electricity is connected, voltage doubling circuit's second end with switching circuit's second end with buzzer's second end electricity is connected, voltage doubling circuit's third end with switching circuit's third end electricity is connected, voltage doubling circuit is used for when switching circuit work is when the off-state, exports drive voltage, works as switching circuit work is when the on-state, exports discharge voltage, according to predetermineeing frequency output drive voltage with discharge voltage, in order to drive buzzer sends the sound of singing.
2. The buzzer driving circuit of claim 1, wherein the voltage doubling circuit comprises:
the charging and discharging circuit is respectively and electrically connected with the external power supply, the second end of the switch circuit and the third end of the switch circuit;
and the pull-up circuit is electrically connected with the external power supply, the charging and discharging circuit and the third end of the switch circuit respectively.
3. The buzzer driving circuit of claim 2, wherein the charge and discharge circuit comprises a switching diode, a capacitor and a first resistor;
the anode of the switch diode is connected with the external power supply and one end of the pull-up circuit, and the cathode of the switch diode is connected with one end of the capacitor and one end of the first resistor;
the other end of the capacitor is connected with the other end of the pull-up circuit and the third end of the switch circuit;
the other end of the first resistor is connected with the second end of the buzzer and the second end of the switch circuit.
4. The buzzer driving circuit as claimed in claim 3, wherein the pull-up circuit includes a second resistor, one end of the second resistor is connected to the external power source and the anode of the switching diode, and the other end of the second resistor is connected to the other end of the capacitor and the third end of the switching circuit.
5. The buzzer drive circuit of claim 1, wherein the switching circuit comprises:
the first switch circuit is respectively and electrically connected with the controller, the first end of the buzzer and the third end of the voltage doubling circuit;
and the second switch circuit is respectively and electrically connected with the controller, the first end of the buzzer, the second end of the buzzer and the second end of the voltage doubling circuit.
6. The buzzer driving circuit of claim 5, wherein the first switch circuit comprises a third resistor and a first NPN transistor;
one end of the third resistor is connected with the controller, the first end of the buzzer and the second switch circuit, and the other end of the third resistor is connected with the base electrode of the first NPN triode;
and the collector of the first NPN triode is connected with the third end of the voltage doubling circuit, and the emitter of the first NPN triode is grounded.
7. The buzzer driving circuit of claim 6, wherein the second switching circuit comprises a fourth resistor and a second NPN transistor;
one end of the fourth resistor is connected with the controller, one end of the third resistor and the first end of the buzzer, and the other end of the fourth resistor is connected with the base electrode of the second NPN triode;
and the collector of the second NPN triode is electrically connected with the second end of the buzzer and the second end of the voltage doubling circuit, and the emitter of the second NPN triode is grounded.
8. The buzzer driving circuit of claim 1, further comprising a current limiting circuit electrically connected between the controller and the first end of the buzzer.
9. The buzzer driving circuit of claim 8, wherein the current limiting circuit comprises a fifth resistor, one end of the fifth resistor is connected to the controller, and the other end of the fifth resistor is connected to the first end of the buzzer.
10. An electronic device characterized by comprising the buzzer driving circuit according to any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922131117.4U CN211555457U (en) | 2019-11-29 | 2019-11-29 | Buzzer driving circuit and electronic equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201922131117.4U CN211555457U (en) | 2019-11-29 | 2019-11-29 | Buzzer driving circuit and electronic equipment |
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| CN211555457U true CN211555457U (en) | 2020-09-22 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112201218A (en) * | 2020-10-12 | 2021-01-08 | 蚌埠依爱消防电子有限责任公司 | Fire-fighting equipment buzzer drive circuit |
| CN112365869A (en) * | 2020-10-09 | 2021-02-12 | 华帝股份有限公司 | Single IO controlled buzzer circuit and control method thereof |
-
2019
- 2019-11-29 CN CN201922131117.4U patent/CN211555457U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112365869A (en) * | 2020-10-09 | 2021-02-12 | 华帝股份有限公司 | Single IO controlled buzzer circuit and control method thereof |
| CN112201218A (en) * | 2020-10-12 | 2021-01-08 | 蚌埠依爱消防电子有限责任公司 | Fire-fighting equipment buzzer drive circuit |
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