CN110989759A - Buzzer driving circuit with current detection function - Google Patents
Buzzer driving circuit with current detection function Download PDFInfo
- Publication number
- CN110989759A CN110989759A CN202010074111.2A CN202010074111A CN110989759A CN 110989759 A CN110989759 A CN 110989759A CN 202010074111 A CN202010074111 A CN 202010074111A CN 110989759 A CN110989759 A CN 110989759A
- Authority
- CN
- China
- Prior art keywords
- signal line
- driving
- amplifier
- circuit
- output
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000001514 detection method Methods 0.000 title claims abstract description 17
- 239000000758 substrate Substances 0.000 claims description 5
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
- G05F1/565—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor
- G05F1/569—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor for protection
- G05F1/573—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices sensing a condition of the system or its load in addition to means responsive to deviations in the output of the system, e.g. current, voltage, power factor for protection with overcurrent detector
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Automation & Control Theory (AREA)
- Amplifiers (AREA)
Abstract
The invention provides a buzzer driving circuit with current detection, which comprises an amplifier, a frequency generation circuit, a grid control circuit, a driving NMOS tube and a resistor R1, wherein V1 and Y, F, G are signal lines, V2 is a reference voltage signal line, the negative input end of the amplifier is connected with V2, the positive input end of the amplifier is connected with V1, the output end of the amplifier is connected with Y, the output of the frequency generation circuit is connected with F, one input end of the grid control circuit is connected with F, the other input end of the grid control circuit is connected with Y, the output of the grid control circuit is connected with G, the grid of the driving NMOS tube is connected with G, the drain of the driving NMOS tube is connected with OUT, the source of the driving NMOS tube is connected with V1, one end of the resistor R1 is connected with V1, the ground wire at the other end of the resistor, and when the current flowing.
Description
Technical Field
The invention relates to the field of buzzer circuits, in particular to a buzzer driving circuit.
Background
As shown in fig. 2, the conventional buzzer circuit is composed of a frequency generating circuit and a driving tube, and when the current flowing through the driving tube is too large, the circuit has the disadvantages that the power consumption is not reduced, the chip is damaged or the buzzer or even the whole system is damaged.
Disclosure of Invention
The invention provides a buzzer driving circuit with current detection, which aims to overcome the defect that a chip is damaged or a buzzer or even the whole system is damaged when the current flowing through a driving tube is overlarge in the traditional buzzer driving circuit.
In order to solve the technical problem, the invention provides a buzzer driving circuit with current detection, which comprises an amplifier, a frequency generation circuit, a gate control circuit, a driving NMOS transistor and a resistor R1, wherein V2 is a reference voltage signal line, the negative input end of the amplifier is connected with a signal line V2, the positive input end of the amplifier is connected with a signal line V1, the output end of the amplifier is connected with a signal line Y, the output signal line F of the frequency generation circuit is connected with one input end of the gate control circuit, the other input end of the gate control circuit is connected with the signal line Y, the output of the gate control circuit is connected with a signal line G, the signal line G is connected with the gate of the driving NMOS transistor, the drain of the driving NMOS transistor is connected with an output OUT, the source of the driving NMOS transistor is connected with a signal line V1, the substrate of the driving NMOS transistor is connected with a ground wire.
The reference voltage signal line V2 is a signal line with a certain voltage value generated by a voltage regulator circuit, such as a reference voltage source, a zener diode, etc.
Referring to fig. 1, if the current flowing through the driving NMOS transistor is within the normal range, the circuit parameters are properly designed such that the voltage across the resistor R1 is smaller than the voltage across the signal line V2, i.e., the voltage across the signal line V1 is smaller than the voltage across the signal line V2, and the output Y of the amplifier is at a low level, indicating that the current flowing through the driving NMOS transistor is normal, and if the current flowing through the driving NMOS transistor is too large, the circuit parameters are properly designed such that the voltage across the resistor R1 is greater than the voltage across the signal line V2, i.e., the voltage across the signal line V1 is greater than the voltage across the signal line V2, and the output Y of the amplifier is at a high level, indicating that the; it can be seen that, in the connection mode of the signal lines V1 and V2 shown in fig. 1, the output Y of the amplifier is high, which means that the current flowing through the driving NMOS transistor is too large. If the signal line V1 and the signal line V2 are connected to the positive input end and the negative input end of the amplifier in a reversed position, namely the signal line V1 is connected with the negative input end of the amplifier, the signal line V2 is connected with the positive input end of the amplifier, and the connection relationship between the signal line V1 and the resistor R1 is unchanged, the output Y of the amplifier is low level, which indicates that the current flowing through the driving NMOS tube is overlarge. When the output of the amplifier indicates that the current flowing through the drive NMOS tube is normal, the grid control circuit enables the output signal F of the frequency generation circuit to normally pass through, and the drive NMOS tube normally drives the buzzer; when the output of the amplifier indicates that the current flowing through the drive NMOS tube is too large, the grid control circuit outputs a signal line G to cut off the drive NMOS tube so as to reduce the power consumption of the circuit and prevent the chip and the system from being damaged. The circuit is simple to realize and has the advantages of high reliability and low cost.
Preferably, the substrate of the drive NMOS tube is connected with a ground wire or connected with the source electrode of the drive NMOS tube.
Preferably, the driving NMOS transistor may also be replaced by an NPN transistor, that is, the NPN transistor is used as the driving transistor of the buzzer.
The invention has the following beneficial effects: according to the buzzer driving circuit with the current detection function, the NMOS tube is turned off when the current flowing through the driving tube is too large so as to reduce the power consumption of a chip, and the chip is prevented from being damaged or a buzzer or even the whole system is prevented from being damaged.
Drawings
Fig. 1 is a schematic structural diagram of a buzzer driving circuit with current detection according to the present invention.
Figure 2 is a background art schematic.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, the present invention provides a buzzer driving circuit with current detection, which includes an amplifier, a frequency generation circuit, a gate control circuit, a driving NMOS transistor, and a resistor R1, wherein V2 is a reference voltage signal line, a negative input terminal of the amplifier is connected to a signal line V2, a positive input terminal of the amplifier is connected to a signal line V1, an output terminal of the amplifier is connected to a signal line Y, an output signal line F of the frequency generation circuit is connected to one input terminal of the gate control circuit, another input terminal of the gate control circuit is connected to the signal line Y, an output of the gate control circuit is connected to a signal line G, the signal line G is connected to a gate of the driving NMOS transistor, a drain of the driving NMOS transistor is connected to an output OUT, a source of the driving NMOS transistor is connected to the signal line V1, a substrate of the driving NMOS transistor is connected to a ground.
The reference voltage signal line V2 is a signal line with a certain voltage value generated by a voltage regulator circuit, such as a reference voltage source, a zener diode, etc.
Referring to fig. 1, if the current flowing through the driving NMOS transistor is within the normal range, the circuit parameters are properly designed such that the voltage across the resistor R1 is smaller than the voltage across the signal line V2, i.e., the voltage across the signal line V1 is smaller than the voltage across the signal line V2, and the output Y of the amplifier is at a low level, indicating that the current flowing through the driving NMOS transistor is normal, and if the current flowing through the driving NMOS transistor is too large, the circuit parameters are properly designed such that the voltage across the resistor R1 is greater than the voltage across the signal line V2, i.e., the voltage across the signal line V1 is greater than the voltage across the signal line V2, and the output Y of the amplifier is at a high level, indicating that the; it can be seen that, in the connection mode of the signal lines V1 and V2 shown in fig. 1, the output Y of the amplifier is high, which means that the current flowing through the driving NMOS transistor is too large. If the signal line V1 and the signal line V2 are connected to the positive input end and the negative input end of the amplifier in a reversed position, namely the signal line V1 is connected with the negative input end of the amplifier, the signal line V2 is connected with the positive input end of the amplifier, and the connection relationship between the signal line V1 and the resistor R1 is unchanged, the output Y of the amplifier is low level, which indicates that the current flowing through the driving NMOS tube is overlarge. When the output of the amplifier indicates that the current flowing through the drive NMOS tube is normal, the grid control circuit enables the output signal F of the frequency generation circuit to normally pass through, and the drive NMOS tube normally drives the buzzer; when the output of the amplifier indicates that the current flowing through the drive NMOS tube is too large, the grid control circuit outputs a signal line G to cut off the drive NMOS tube so as to reduce the power consumption of the circuit and prevent the chip and the system from being damaged.
In summary, the buzzer driving circuit with current detection provided by the invention turns off the driving tube to reduce power consumption when the current of the driving tube is too large, so as to prevent the chip and the system from being damaged.
The above description is only an example of the present invention, and is not intended to limit the present invention, and it is obvious to those skilled in the art that various modifications and variations can be made in the present invention. 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 (8)
1. A buzzer driving circuit with current detection is characterized by comprising an amplifier, a frequency generation circuit, a grid control circuit, a driving NMOS tube and a resistor R1, wherein V2 is a reference voltage signal line, the negative input end of the amplifier is connected with a signal line V2, the positive input end of the amplifier is connected with a signal line V1, the output end of the amplifier is connected with a signal line Y, an output signal line F of the frequency generation circuit is connected with one input end of the grid control circuit, the other input end of the grid control circuit is connected with the signal line Y, the output of the grid control circuit is connected with a signal line G, the signal line G is connected with the grid of the driving NMOS tube, the drain of the driving NMOS tube is connected with an output OUT, the source of the driving NMOS tube is connected with the signal line V1, the substrate of the driving NMOS tube is connected with a grounding wire, one end of the resistor.
2. The buzzer driving circuit with current detection as claimed in claim 1, wherein the substrate of the driving NMOS tube is connected with a grounding wire or connected with the source electrode of the driving NMOS tube.
3. The buzzer driving circuit with current detection as claimed in claim 1, wherein said amplifier is capable of detecting whether the voltage of a resistor R1 connected in series with the driving NMOS transistor is excessive.
4. The buzzer driving circuit with current detection as claimed in claim 1, wherein said resistor R1 is connected in series with the driving NMOS transistor.
5. The buzzer driving circuit with current detection as claimed in claim 1, wherein said amplifier is also connected with said signal line V2 at positive input terminal and said signal line V1 at negative input terminal.
6. The buzzer driving circuit with current detection as claimed in claim 1, wherein said gate control circuit functions such that when the output of the amplifier indicates that the current flowing through the driving NMOS transistor is too large, the gate control circuit outputs a signal line G to turn off the driving NMOS transistor, and when the output of the amplifier indicates that the current flowing through the driving NMOS transistor is normal, the gate control circuit causes the frequency generation circuit to output a signal F to normally pass.
7. The buzzer driving circuit with current detection as claimed in claim 1, wherein said V2 reference voltage signal line is a signal line with a certain voltage value.
8. The buzzer driving circuit with current detection as claimed in claim 1, wherein said driving NMOS transistor can be replaced by NPN transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010074111.2A CN110989759A (en) | 2020-01-22 | 2020-01-22 | Buzzer driving circuit with current detection function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010074111.2A CN110989759A (en) | 2020-01-22 | 2020-01-22 | Buzzer driving circuit with current detection function |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110989759A true CN110989759A (en) | 2020-04-10 |
Family
ID=70081394
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010074111.2A Pending CN110989759A (en) | 2020-01-22 | 2020-01-22 | Buzzer driving circuit with current detection function |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110989759A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110518895A (en) * | 2019-08-26 | 2019-11-29 | 无锡天极芯科技有限公司 | A kind of circuit for preventing buzzer driving tube grid voltage from declining |
| CN110895922A (en) * | 2019-11-22 | 2020-03-20 | 无锡十顶电子科技有限公司 | High-reliability buzzer driving circuit |
| CN211554779U (en) * | 2020-01-22 | 2020-09-22 | 无锡十顶电子科技有限公司 | Buzzer driving circuit with current detection function |
-
2020
- 2020-01-22 CN CN202010074111.2A patent/CN110989759A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110518895A (en) * | 2019-08-26 | 2019-11-29 | 无锡天极芯科技有限公司 | A kind of circuit for preventing buzzer driving tube grid voltage from declining |
| CN110895922A (en) * | 2019-11-22 | 2020-03-20 | 无锡十顶电子科技有限公司 | High-reliability buzzer driving circuit |
| CN211554779U (en) * | 2020-01-22 | 2020-09-22 | 无锡十顶电子科技有限公司 | Buzzer driving circuit with current detection function |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US7274227B2 (en) | Power-on reset circuit | |
| US9024660B2 (en) | Driving circuit with zero current shutdown and a driving method thereof | |
| CN211429601U (en) | Open circuit and short circuit detection circuit and LED switching power supply control system | |
| CN212135942U (en) | Buzzer driving circuit with electromagnetic coil detection function | |
| CN212135943U (en) | Solenoid detection circuitry based on bee calling organ | |
| CN211554779U (en) | Buzzer driving circuit with current detection function | |
| CN111179891A (en) | Drive circuit based on buzzer detects with temperature | |
| CN110989759A (en) | Buzzer driving circuit with current detection function | |
| CN110895922A (en) | High-reliability buzzer driving circuit | |
| CN213070608U (en) | Buzzer driving circuit with temperature detection function | |
| CN114498572B (en) | CMOS process compatible interface chip power-down protection circuit and method | |
| CN111091803A (en) | Buzzer driving circuit with electromagnetic coil detection function | |
| CN111007910B (en) | Open-drain output control circuit | |
| CN111049513B (en) | Rail-to-rail bus holding circuit with cold backup function | |
| CN115314038A (en) | Gate-level buffer circuit based on SiC power device | |
| US11418052B2 (en) | Power circuit and driving method thereof | |
| CN111063329A (en) | Buzzer driving circuit with temperature detection function | |
| CN212135940U (en) | Drive circuit based on buzzer detects with temperature | |
| CN112885320A (en) | High-reliability driving circuit of buzzer | |
| CN220234206U (en) | Anti-reverse irrigation circuit, charging system and vehicle | |
| US6664823B2 (en) | Inverter output circuit | |
| CN115201550B (en) | High-voltage input detection circuit | |
| CN212063619U (en) | Relay power supply switching circuit based on photoelectric coupling | |
| CN215581093U (en) | Push-pull type driving device | |
| CN219105102U (en) | Relay fault detection circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |