CN212135942U - Buzzer driving circuit with electromagnetic coil detection function - Google Patents
Buzzer driving circuit with electromagnetic coil detection function Download PDFInfo
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- CN212135942U CN212135942U CN202020114905.2U CN202020114905U CN212135942U CN 212135942 U CN212135942 U CN 212135942U CN 202020114905 U CN202020114905 U CN 202020114905U CN 212135942 U CN212135942 U CN 212135942U
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Abstract
The utility model provides a take buzzer drive circuit of solenoid detection, including logic circuit, voltage detection circuit, NMOS drive 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. Output Vo external buzzer solenoid, the utility model discloses a when the NMOS drive tube switches on, detect the voltage of NMOS drive tube leakage terminal, turn off the NMOS drive tube when the solenoid short circuit, play and prevent that buzzer circuit and system are impaired effect. The circuit has the advantages of simple structure and low cost.
Description
Technical Field
The utility model relates to an electromagnetic type buzzer circuit field, concretely relates to take buzzer drive circuit of solenoid 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.
SUMMERY OF THE UTILITY MODEL
The conventional buzzer driving circuit causes excessive current flowing through the NMOS driving tube when the buzzer solenoid is short-circuited, which may cause damage to a system using the buzzer, and may also cause damage to the driving circuit itself.
In order to solve the technical problem, the utility model provides a take buzzer drive circuit of solenoid detection, including logic circuit, voltage detection circuit, NMOS drive 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 utility model discloses a theory of operation does: 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 short-circuited, 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 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.
Preferably, the logic circuit functions as: when the electromagnetic coil of the buzzer is short-circuited, 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 utility model discloses the beneficial effect who brings: the utility model provides a pair of take buzzer drive circuit of solenoid detection, through when the NMOS drive tube switches on, detect NMOS drive tube leakage end or output Vo's voltage, turn-off the NMOS drive tube when the solenoid short circuit, play and prevent that buzzer circuit and system are impaired effect. The circuit has the advantages of simple structure and low cost.
Drawings
Fig. 1 is a schematic structural diagram 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 present invention.
Fig. 3 is a timing diagram of a buzzer driving circuit with electromagnetic coil detection according to 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 clearer, the present invention will be described in detail with reference to the accompanying drawings and specific embodiments.
As shown in FIG. 1, the utility model provides a buzzer drive circuit with electromagnetic coil detection, which comprises a logic circuit, a voltage detection circuit and an NMOS drive 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 utility model discloses a theory of operation does: 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 short-circuited, 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 utility model discloses a first embodiment: 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.
The utility model discloses an operation time sequence of first embodiment is shown in fig. 3, combines fig. 2, and F is the frequency signal that buzzer needs, and F's delay signal is as time sequence signal T, before the time of T1 shown in fig. 3, when F, T is low level, inverter output G is low level, and the NMOS drive tube ends; 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-; 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 that figure 2 shows is only the utility model discloses a circuit in practical application, voltage detection circuit and logic circuit shown in figure 1 can have various changes, can have voltage comparator and logic gate to constitute if voltage detection, also can have level conversion circuit and logic gate to constitute, and logic circuit can switch on every cycle to the NMOS drive tube and detect, also can switch on one or more than one cycle to the NMOS drive tube and detect the back, keeps the NMOS drive tube ending until the circuit is gone up again.
To sum up, the utility model provides a pair of take buzzer drive circuit of solenoid detection through when the NMOS drive tube switches on, detects NMOS drive tube leakage end or output Vo's voltage, turns off the NMOS drive tube when the solenoid short circuit, plays the effect that prevents buzzer circuit and system impaired. 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 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 (6)
1. The buzzer driving circuit comprises a logic circuit, a voltage detection circuit and an NMOS driving tube, wherein 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 short-circuited, 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 |
|---|---|---|---|
| CN202020114905.2U CN212135942U (en) | 2020-01-20 | 2020-01-20 | Buzzer driving circuit with electromagnetic coil detection function |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020114905.2U CN212135942U (en) | 2020-01-20 | 2020-01-20 | Buzzer driving circuit with electromagnetic coil detection function |
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| Publication Number | Publication Date |
|---|---|
| CN212135942U true CN212135942U (en) | 2020-12-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020114905.2U Active CN212135942U (en) | 2020-01-20 | 2020-01-20 | Buzzer driving circuit with electromagnetic coil detection function |
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| CN (1) | CN212135942U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111091803A (en) * | 2020-01-20 | 2020-05-01 | 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 |
-
2020
- 2020-01-20 CN CN202020114905.2U patent/CN212135942U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111091803A (en) * | 2020-01-20 | 2020-05-01 | 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 |
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