CN111091803A - Buzzer driving circuit with electromagnetic coil detection function - Google Patents
Buzzer driving circuit with electromagnetic coil detection function Download PDFInfo
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- CN111091803A CN111091803A CN202010057128.7A CN202010057128A CN111091803A CN 111091803 A CN111091803 A CN 111091803A CN 202010057128 A CN202010057128 A CN 202010057128A CN 111091803 A CN111091803 A CN 111091803A
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- 238000001514 detection method Methods 0.000 title claims abstract description 42
- 230000002159 abnormal effect Effects 0.000 claims abstract description 5
- 239000000758 substrate Substances 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
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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
- G10K9/13—Devices in which sound is produced by vibrating a diaphragm or analogous element, e.g. fog horns, vehicle hooters or buzzers electrically operated using electromagnetic driving means
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Abstract
The invention provides a buzzer driving circuit with electromagnetic coil detection, which comprises a logic circuit, a voltage detection circuit and an NMOS driving tube. F is a frequency signal, T is a time sequence signal, the output G of the logic circuit is connected to the grid electrode of the NMOS driving tube, the drain electrode of the NMOS driving tube is connected with the output Vo, the source electrode of the NMOS driving tube is connected with the ground wire, the output Vo is connected with the input of the voltage detection circuit, T is connected with the input of the voltage detection circuit, the output C of the voltage detection circuit is connected with the input of the logic circuit, and F is connected with the input of the logic circuit. The output Vo is externally connected with the electromagnetic coil of the buzzer, and the invention can detect the voltage at the drain end of the NMOS driving tube when the NMOS driving tube is conducted, and can turn off the NMOS driving tube when the electromagnetic coil is in abnormal short circuit, thereby preventing the circuit and the system of the buzzer from being damaged. The circuit has the advantages of simple structure and low cost.
Description
Technical Field
The invention relates to the field of electromagnetic buzzer circuits, in particular to a buzzer driving circuit with electromagnetic coil detection.
Background
As shown in fig. 4, the conventional buzzer driving circuit, when the electromagnetic coil is short-circuited, may cause excessive current flowing through the NMOS driving tube, which may cause damage to the system using the buzzer, and may also damage the driving circuit itself.
Disclosure of Invention
The invention provides a buzzer driving circuit with electromagnetic coil detection, when the electromagnetic coil of the buzzer is short-circuited, the current flowing through an NMOS driving tube is overlarge, which may cause damage of a system using the buzzer and damage of the driving circuit.
In order to solve the technical problem, the invention provides a buzzer driving circuit with electromagnetic coil detection, which comprises a logic circuit, a voltage detection circuit and an NMOS driving tube. F is a frequency signal, T is a time sequence signal, the output G of the logic circuit is connected to the grid electrode of the NMOS driving tube, the drain electrode of the NMOS driving tube is connected with the output Vo, the source electrode of the NMOS driving tube is connected with the ground wire, the output Vo is connected with the input of the voltage detection circuit, T is connected with the input of the voltage detection circuit, the output C of the voltage detection circuit is connected with the input of the logic circuit, and F is connected with the input of the logic circuit.
The working principle of the invention is as follows: when the NMOS driving tube is conducted, the voltage of the drain end of the NMOS driving tube is detected, the voltage detection result C is output to the logic circuit, if the drain end of the NMOS driving tube or the output Vo of the connected electromagnetic coil is higher than the set potential to indicate that the electromagnetic coil is in a short circuit abnormal state, the logic circuit outputs G to cut off the NMOS driving tube to prevent a system or a circuit from being damaged, and if the drain end of the NMOS driving tube or the output Vo of the connected electromagnetic coil is lower than the set potential to indicate that the electromagnetic coil is normal, the logic circuit outputs G to normally conduct the NMOS driving tube.
Preferably, the logic circuit functions as: when the electromagnetic coil of the buzzer is in short circuit and abnormal, the logic circuit outputs a signal G to cut off the NMOS driving tube.
Preferably, the voltage detection circuit functions as: when the NMOS drive tube is conducted, whether the output Vo of the drain end of the NMOS drive tube or the connection electromagnetic coil is lower than the set potential is judged, and the result is output to a signal line C.
Preferably, the substrate of the NMOS driving tube is grounded or connected with other potentials, so that the normal operation of the circuit is not influenced.
Preferably, in the buzzer driving circuit with electromagnetic coil detection, a resistor, a diode, a MOS transistor and other devices may be connected in series between the drain terminal of the NMOS driving transistor and the output Vo.
The invention has the following beneficial effects: according to the buzzer driving circuit with the electromagnetic coil detection, provided by the invention, when the NMOS driving tube is conducted, the voltage of the drain end or the output end Vo of the NMOS driving tube is detected, and the NMOS driving tube is turned off when the electromagnetic coil is in a short circuit abnormity, so that the buzzer circuit and a system are prevented from being damaged. The circuit has the advantages of simple structure and low cost.
Drawings
Fig. 1 is a schematic diagram of the structure of a buzzer driving circuit with electromagnetic coil detection according to the present invention.
Fig. 2 is a schematic diagram of a buzzer driving circuit with electromagnetic coil detection according to a first embodiment of the invention.
Figure 3 is a schematic timing diagram of a buzzer drive circuit with electromagnetic coil detection in accordance with a first embodiment of the present invention.
Fig. 4 is a schematic diagram of the background art.
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 buzzer driving circuit with electromagnetic coil detection provided by the invention comprises a logic circuit, a voltage detection circuit and an NMOS driving tube. F is a frequency signal, T is a time sequence signal, the output G of the logic circuit is connected to the grid electrode of the NMOS driving tube, the drain electrode of the NMOS driving tube is connected with the output Vo, the source electrode of the NMOS driving tube is connected with the ground wire, the output Vo is connected with the input of the voltage detection circuit, T is connected with the input of the voltage detection circuit, the output C of the voltage detection circuit is connected with the input of the logic circuit, and F is connected with the input of the logic circuit.
The working principle of the invention is as follows: when the NMOS driving tube is conducted, the voltage of the drain end of the NMOS driving tube is detected, the voltage detection result C is output to the logic circuit, if the drain end of the NMOS driving tube or the output Vo of the connecting electromagnetic coil is higher than the set potential to indicate that the electromagnetic coil is in a short circuit abnormal state, the logic circuit outputs G to cut off the NMOS driving tube so as to prevent the damage of a system or a circuit caused by overlarge current flowing through the NMOS driving tube, and if the drain end of the NMOS driving tube or the output Vo of the connecting electromagnetic coil is lower than the set potential to indicate that the electromagnetic coil is normal, the logic circuit outputs G to normally conduct the NMOS driving tube.
The first embodiment of the present invention: as shown in fig. 2, the amplifier includes an amplifier a1, an nand gate 1, an nand gate 2, an inverter, an NMOS driver, a resistor R1, and a resistor R2. F is a frequency signal, T is a timing signal, the drain of the NMOS drive tube is connected with the output Vo, the source of the NMOS drive tube is connected with the ground, the output Vo is connected with the positive input end of an amplifier A1, one end of a resistor R1 is connected with a power supply VDD, the other end of a resistor R1 is connected with a signal line V1, one end of a resistor R2 is connected with a signal line V1, the other end of a resistor R2 is connected with the ground, the signal line V1 is connected with the negative input end of the amplifier A1, the output Y of the amplifier A1 is connected with one end input end of a NAND gate 1, the other input end of the NAND gate 1 is connected with the timing signal T, the output C of the NAND gate 1 is connected with one input end of a NAND gate 2, the other input end of the NAND gate 2 is connected with the.
In conjunction with fig. 1, the amplifier a1 and the nand gate 1 constitute a voltage detection circuit as shown in fig. 1, and the nand gate 2 and the inverter constitute a logic circuit as shown in fig. 1.
An operation timing sequence of the first embodiment of the present invention is shown in fig. 3, and with reference to fig. 2, F is a frequency signal required by the buzzer, a delay signal of F is a timing signal T, and before time T1 shown in fig. 3, when F, T is low, the output G of the inverter is low, and the NMOS driving transistor is turned off; before the time T1 and the time T2, T is low level, C is high level, F is high level, the output G of the inverter is high level, the NMOS driving tube is conducted, in the time, the ratio of the resistor R1 to the resistor R2 is reasonably designed, if the solenoid coil of the buzzer is normal, the voltage of the output Vo is lower than the voltage of a signal line V1 between the resistor R1 and the resistor R2, the output of the amplifier A1 is low level, which indicates that the solenoid coil of the buzzer is normal, if the solenoid coil of the buzzer is short-circuited, the voltage of the output Vo is higher than the voltage of a signal line V1 between the resistor R1 and the resistor R2, and the output of the amplifier A1 is high level, which indicates that the solenoid coil of the buzzer is short-circuited; before the time T2 and the time T3, if the solenoid coil of the buzzer is normal, the output of the amplifier A1 is low level, T is high level, the output C of the NAND gate 1 is high level, F is high level, the output G of the inverter is high level, the NMOS drive tube is continuously conducted, the circuit works normally, if the solenoid coil of the buzzer is short-circuited, the output of the amplifier A1 is high level, T is high level, the output C of the NAND gate 1 is low level, F is high level, the output G of the inverter is low level, and the NMOS drive tube is cut off, so that the circuit and the system are prevented from being damaged.
The circuit shown in fig. 2 is only one circuit in practical application of the present invention, and the voltage detection circuit and the logic circuit shown in fig. 1 may have various changes, for example, the voltage detection may be composed of a voltage comparator and a logic gate, or may be composed of a level conversion circuit and a logic gate, the logic circuit may detect each period of conduction of the NMOS driving transistor, or may detect one or more periods of conduction of the NMOS driving transistor, and then keep the NMOS driving transistor off until the circuit is powered up again.
In summary, according to the buzzer driving circuit with electromagnetic coil detection provided by the invention, when the NMOS driving tube is turned on, the voltage of the drain terminal or the output terminal Vo of the NMOS driving tube is detected, and when the electromagnetic coil is in a short circuit abnormality, the NMOS driving tube is turned off, so that the buzzer circuit and the system are prevented from being damaged. The circuit has the advantages of simple structure and low cost.
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 (6)
1. A buzzer driving circuit with electromagnetic coil detection comprises a logic circuit, a voltage detection circuit and an NMOS driving tube. F is a frequency signal, T is a time sequence signal, the output G of the logic circuit is connected to the grid electrode of the NMOS driving tube, the drain electrode of the NMOS driving tube is connected with the output Vo, the source electrode of the NMOS driving tube is connected with the ground wire, the output Vo is connected with the input of the voltage detection circuit, T is connected with the input of the voltage detection circuit, the output C of the voltage detection circuit is connected with the input of the logic circuit, and F is connected with the input of the logic circuit.
2. A buzzer drive circuit with electromagnetic coil detection as claimed in claim 1, wherein the voltage at the drain terminal of the NMOS drive transistor is detected when the NMOS drive transistor is turned on.
3. A buzzer drive circuit with electromagnetic coil detection as claimed in claim 1, characterised in that the logic circuit functions as: when the electromagnetic coil of the buzzer is in short circuit and abnormal, the logic circuit outputs a signal G to cut off the NMOS driving tube.
4. A buzzer drive circuit with electromagnetic coil detection as set forth in claim 1, wherein the voltage detection circuit functions as: when the NMOS drive tube is conducted, whether the output Vo of the drain end of the NMOS drive tube or the connection electromagnetic coil is lower than the set potential is judged, and the result is output to a signal line C.
5. A buzzer drive circuit with electromagnetic coil detection as claimed in claim 1, wherein the substrate of the NMOS drive tube is grounded or connected to other potential without affecting the normal operation of the circuit.
6. A buzzer driving circuit with electromagnetic coil detection as claimed in claim 1, wherein a resistor, a diode, a MOS transistor, etc. may be connected in series between the drain of the NMOS driving transistor and the output Vo.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010057128.7A CN111091803A (en) | 2020-01-20 | 2020-01-20 | Buzzer driving circuit with electromagnetic coil detection function |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010057128.7A CN111091803A (en) | 2020-01-20 | 2020-01-20 | Buzzer driving circuit with electromagnetic coil detection function |
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| Publication Number | Publication Date |
|---|---|
| CN111091803A true CN111091803A (en) | 2020-05-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202010057128.7A Pending CN111091803A (en) | 2020-01-20 | 2020-01-20 | Buzzer driving circuit with electromagnetic coil detection function |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111161697A (en) * | 2020-01-21 | 2020-05-15 | 无锡十顶电子科技有限公司 | Solenoid detection circuitry based on bee calling organ |
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|---|---|---|---|---|
| US20020027391A1 (en) * | 2000-09-05 | 2002-03-07 | Takaharu Hutamura | Reduced current and power consumption structure of drive circuit |
| JP2004086257A (en) * | 2002-08-22 | 2004-03-18 | Toyota Motor Corp | Abnormality detection device |
| CN101567668A (en) * | 2008-04-24 | 2009-10-28 | 骅讯电子企业股份有限公司 | Voltage detection type overcurrent protection device applied to D-class amplifier |
| CN102996885A (en) * | 2012-10-19 | 2013-03-27 | 宁波长壁流体动力科技有限公司 | Protection drive circuit of small-power electromagnetic coil |
| CN104535856A (en) * | 2014-12-17 | 2015-04-22 | 万向钱潮股份有限公司 | Magnetorheology damper failure and fault detecting method |
| CN110488140A (en) * | 2019-09-20 | 2019-11-22 | 无锡麦道电子科技有限公司 | A kind of electromagnet fault detection circuit device and its detection method |
| CN110609583A (en) * | 2019-08-26 | 2019-12-24 | 无锡十顶电子科技有限公司 | Circuit for stabilizing grid voltage of driving tube by buzzer |
| CN111161697A (en) * | 2020-01-21 | 2020-05-15 | 无锡十顶电子科技有限公司 | Solenoid detection circuitry based on bee calling organ |
| CN212135943U (en) * | 2020-01-21 | 2020-12-11 | 无锡十顶电子科技有限公司 | Solenoid detection circuitry based on bee calling organ |
| CN212135942U (en) * | 2020-01-20 | 2020-12-11 | 无锡十顶电子科技有限公司 | Buzzer driving circuit with electromagnetic coil detection function |
-
2020
- 2020-01-20 CN CN202010057128.7A patent/CN111091803A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20020027391A1 (en) * | 2000-09-05 | 2002-03-07 | Takaharu Hutamura | Reduced current and power consumption structure of drive circuit |
| JP2004086257A (en) * | 2002-08-22 | 2004-03-18 | Toyota Motor Corp | Abnormality detection device |
| CN101567668A (en) * | 2008-04-24 | 2009-10-28 | 骅讯电子企业股份有限公司 | Voltage detection type overcurrent protection device applied to D-class amplifier |
| CN102996885A (en) * | 2012-10-19 | 2013-03-27 | 宁波长壁流体动力科技有限公司 | Protection drive circuit of small-power electromagnetic coil |
| CN104535856A (en) * | 2014-12-17 | 2015-04-22 | 万向钱潮股份有限公司 | Magnetorheology damper failure and fault detecting method |
| CN110609583A (en) * | 2019-08-26 | 2019-12-24 | 无锡十顶电子科技有限公司 | Circuit for stabilizing grid voltage of driving tube by buzzer |
| CN110488140A (en) * | 2019-09-20 | 2019-11-22 | 无锡麦道电子科技有限公司 | A kind of electromagnet fault detection circuit device and its detection method |
| CN212135942U (en) * | 2020-01-20 | 2020-12-11 | 无锡十顶电子科技有限公司 | Buzzer driving circuit with electromagnetic coil detection function |
| CN111161697A (en) * | 2020-01-21 | 2020-05-15 | 无锡十顶电子科技有限公司 | Solenoid detection circuitry based on bee calling organ |
| CN212135943U (en) * | 2020-01-21 | 2020-12-11 | 无锡十顶电子科技有限公司 | Solenoid detection circuitry based on bee calling organ |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111161697A (en) * | 2020-01-21 | 2020-05-15 | 无锡十顶电子科技有限公司 | Solenoid detection circuitry based on bee calling organ |
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