Buzzer driving circuit with electromagnetic coil detection
A technology of voltage detection circuit and electromagnetic coil, which is applied in the direction of instruments and sound-generating devices, can solve problems such as damage to the buzzer system, damage to the drive circuit, and large current of the NMOS drive tube. It achieves low cost, simple structure, and prevents damage Effect
Pending Publication Date: 2020-05-01
无锡十顶电子科技有限公司
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Problems solved by technology
[0002] like Figure 4 As shown, in the traditional buzzer drive circuit, when the electromagnetic coil is short-circuited, the current flowing through the NMOS drive tube will be too large, which may cause damage to the system using the buzzer, and the drive circuit itself may also be damaged
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[0018] The first embodiment of the present invention: as figure 2 As shown, it includes amplifier A1, NAND gate 1, NAND gate 2, inverter, NMOS drive tube, resistor R1, and resistor R2. Among them, F is the frequency signal, T is the timing signal, the drain of the NMOS drive tube is connected to the output Vo, the source of the NMOS drive tube is connected to the ground wire, the output Vo is connected to the positive input terminal of the amplifier A1, one end of the resistor R1 is connected to the power supply VDD, and the resistor R1 is connected to the power supply VDD. The other end of R1 is connected to the signal line V1, one end of the resistor R2 is connected to the signal line V1, the other end of the resistor R2 is connected to the ground wire, the signal line V1 is connected to the negative input terminal of the amplifier A1, and the output Y of the amplifier A1 is connected to one input terminal of the NAND gate 1 , the other input terminal of NAND gate 1 is conn...
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The invention provides a buzzer drive circuit with electromagnetic coil detection. The buzzer drive circuit comprises a logic circuit, a voltage detection circuit and an NMOS drive tube, wherein F isa frequency signal; T is a timing signal, the output G of the logic circuit is connected to a grid electrode of the NMOS driving tube, a drain electrode of the NMOS driving tube is connected with theoutput Vo, and a source electrode of the NMOS driving tube is connected with a ground wire; the output Vo is connected with the input of the voltage detection circuit, the 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 the F is connected with the input of the logic circuit. When theNMOS driving tube is conducted, the voltage of the drain end of the NMOS driving tube is detected, and when the electromagnetic coil is short-circuited and abnormal, 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.
Description
technical field [0001] The invention relates to the field of an electromagnetic buzzer circuit, in particular to a buzzer drive circuit with electromagnetic coil detection. Background technique [0002] Such as Figure 4 As shown, in the traditional buzzer drive circuit, when the electromagnetic coil is short-circuited, the current flowing through the NMOS drive tube will be too large, which may cause damage to the system using the buzzer, and the drive circuit itself may also be damaged. Contents of the invention [0003] The invention provides a buzzer drive circuit with electromagnetic coil detection. When the buzzer electromagnetic coil is short-circuited, the current flowing through the NMOS drive tube will be too large, which may cause damage to the system using the buzzer. The drive circuit itself can also be damaged. [0004] In order to solve the above technical problems, the present invention provides a buzzer drive circuit with electromagnetic coil detection, i...
Claims
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IPC IPC(8): G10K9/13
CPCG10K9/13
Inventor 张怀东
Owner 无锡十顶电子科技有限公司