CN210867619U - Circuit for stabilizing grid voltage of buzzer driving tube - Google Patents
Circuit for stabilizing grid voltage of buzzer driving tube Download PDFInfo
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- CN210867619U CN210867619U CN201921390646.XU CN201921390646U CN210867619U CN 210867619 U CN210867619 U CN 210867619U CN 201921390646 U CN201921390646 U CN 201921390646U CN 210867619 U CN210867619 U CN 210867619U
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Abstract
The utility model provides a circuit for stabilizing buzzer driving tube grid voltage, including diode D1, PMOS pipe MP1, NMOS pipe MN 1. Wherein, F is a frequency signal, the source electrode of the PMOS tube MP1 is connected to the power line, the drain electrode of the PMOS tube MP1 is connected to the anode of the diode D1, the grid electrode of the PMOS tube MP1 is connected with F, the substrate of the PMOS tube MP1 is connected to the power supply, the anode of the diode D1 is connected to the drain electrode of the PMOS tube MP1, the cathode of the diode D1 is connected to the grid electrode G of the NMOS driving tube of the buzzer, the source electrode of the NMOS tube 387MN 5 is connected to the ground wire, the drain electrode of the NMOS tube MN1 is connected to the grid electrode G of the NMOS driving tube of the buzzer, the grid electrode of the. The utility model discloses an utilize two end voltage forward of diode to switch on reverse characteristic that ends, play and prevent that buzzer NMOS drive tube grid voltage from following the effect that mains voltage descends. The circuit has the advantages of low cost and easy realization.
Description
Technical Field
The utility model relates to a buzzer circuit field, concretely relates to a circuit for stabilizing buzzer driving tube grid voltage.
Background
As shown in fig. 2, in the conventional gate driving circuit of the buzzer driving tube, when the voltage of the power line drops, the gate voltage of the buzzer driving tube drops along with the voltage of the power line, so that the driving capability of the buzzer driving tube is insufficient, and even the output frequency of the buzzer is unstable.
SUMMERY OF THE UTILITY MODEL
The utility model provides a circuit for stabilizing buzzer driving tube grid voltage when mains voltage descends to solve the grid voltage of buzzer driving tube and follow the problem that mains voltage descends together, when preventing mains voltage from descending, the driving force of buzzer driving tube is not enough, can arouse buzzer output frequency's unstability even.
In order to solve the above technical problem, the utility model provides a circuit for stabilizing buzzer driving tube grid voltage, including diode D1, PMOS pipe MP1, NMOS pipe MN 1. Wherein, F is a frequency signal, the source electrode of the PMOS tube MP1 is connected to the power line, the drain electrode of the PMOS tube MP1 is connected to the anode of the diode D1, the grid electrode of the PMOS tube MP1 is connected with F, the substrate of the PMOS tube MP1 is connected to the power supply, the anode of the diode D1 is connected to the drain electrode of the PMOS tube MP1, the cathode of the diode D1 is connected to the grid electrode G of the NMOS driving tube of the buzzer, the source electrode of the NMOS tube 387MN 5 is connected to the ground wire, the drain electrode of the NMOS tube MN1 is connected to the grid electrode G of the NMOS driving tube of the buzzer, the grid electrode of the.
Preferably, there is at least one diode.
The utility model discloses the beneficial effect who brings: the utility model provides a pair of a circuit for stabilizing buzzer driving tube grid voltage through utilizing two end voltage forward of diode to switch on reverse characteristic that ends, plays and prevents that buzzer NMOS driving tube grid voltage from following the effect that mains voltage descends. The circuit has the advantages of low cost and easy realization.
Drawings
Fig. 1 is a schematic diagram of the circuit structure of the present invention.
Fig. 2 is a schematic diagram of a prior art circuit.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail with reference to the accompanying drawings.
As shown in fig. 1, the utility model provides a circuit for stabilizing buzzer driving tube grid voltage, including diode D1, PMOS pipe MP1, NMOS pipe MN 1. Wherein, F is a frequency signal, the source electrode of the PMOS tube MP1 is connected to the power line, the drain electrode of the PMOS tube MP1 is connected to the anode of the diode D1, the grid electrode of the PMOS tube MP1 is connected with F, the substrate of the PMOS tube MP1 is connected to the power supply, the anode of the diode D1 is connected to the drain electrode of the PMOS tube MP1, the cathode of the diode D1 is connected to the grid electrode G of the NMOS driving tube of the buzzer, the source electrode of the NMOS tube 387MN 5 is connected to the ground wire, the drain electrode of the NMOS tube MN1 is connected to the grid electrode G of the NMOS driving tube of the buzzer, the grid electrode of the.
When the output signal F of the oscillator in the chip is at a low level, the NMOS tube MN1 is cut off, the PMOS tube MP1 is started, the power supply charges the grid electrode of the buzzer NMOS drive tube through the PMOS tube MP1 and the diode D1, the buzzer NMOS drive tube is started, when the power supply voltage drops, the diode D1 is in a reverse cut-off state, and the diode D1 cuts off a leakage path of the grid electrode of the buzzer NMOS drive tube, so that the grid electrode voltage of the buzzer NMOS drive tube cannot drop along with the power supply voltage.
To sum up, the utility model provides a pair of a circuit for stabilizing buzzer driving tube grid voltage through utilizing two end voltage forward of diode to switch on reverse characteristic that ends, plays and prevents that buzzer NMOS driving tube grid voltage from following the effect that supply voltage descends. The circuit has the advantages of low cost and easy realization.
The above description is only an example of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (2)
1. A circuit for stabilizing grid voltage of a buzzer driving tube comprises a diode D1, a PMOS tube MP1 and an NMOS tube MN1, wherein F is a frequency signal, the source electrode of the PMOS tube MP1 is connected to a power line, the drain electrode of the PMOS tube MP1 is connected to the anode electrode of a diode D1, the grid electrode of the PMOS tube MP1 is connected with F, the substrate of the PMOS tube MP1 is connected to a power supply, the anode electrode of a diode D1 is connected to the drain electrode of the PMOS tube MP1, the cathode electrode of the diode D1 is connected to the grid electrode G of the buzzer NMOS driving tube, the source electrode of the NMOS tube MN1 is connected to the ground line, the drain electrode of the NMOS tube MN1 is connected to the grid electrode G of the buzzer NMOS driving tube, the grid electrode of the NMOS.
2. The circuit for stabilizing the gate voltage of a buzzer driving tube according to claim 1, wherein there is at least one diode D1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921390646.XU CN210867619U (en) | 2019-08-26 | 2019-08-26 | Circuit for stabilizing grid voltage of buzzer driving tube |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921390646.XU CN210867619U (en) | 2019-08-26 | 2019-08-26 | Circuit for stabilizing grid voltage of buzzer driving tube |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN210867619U true CN210867619U (en) | 2020-06-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921390646.XU Active CN210867619U (en) | 2019-08-26 | 2019-08-26 | Circuit for stabilizing grid voltage of buzzer driving tube |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN210867619U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110445479A (en) * | 2019-08-26 | 2019-11-12 | 无锡天极芯科技有限公司 | It is a kind of for stablizing the circuit of buzzer driving tube grid voltage |
-
2019
- 2019-08-26 CN CN201921390646.XU patent/CN210867619U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110445479A (en) * | 2019-08-26 | 2019-11-12 | 无锡天极芯科技有限公司 | It is a kind of for stablizing the circuit of buzzer driving tube grid voltage |
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