Circuit for stabilizing grid voltage of driving tube of buzzer
A technology of buzzer and pole voltage, which is applied in the circuit field of stabilizing the gate voltage of the buzzer drive tube, which can solve the problems of unstable output frequency of the buzzer and insufficient drive capability of the buzzer drive tube, etc., and achieves a simple structure , low cost effect
Pending Publication Date: 2019-12-24
无锡十顶电子科技有限公司
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Problems solved by technology
[0003] The invention provides a circuit for stabilizing the gate voltage of the buzzer drive tube, which solves the problem that the grid voltage of the buzzer drive tube drops together with the voltage of the power line w
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[0015] The first embodiment of the present invention: the working sequence is as follows figure 2 shown, combined with figure 1 , F is the frequency signal generated inside the chip. When the level of F changes and the NMOS drive tube of the buzzer is turned on, that is, at the beginning of t1, the output N1 of the logic control circuit is low level, and the NMOS tube MN1 remains off. , the output N2 of the logic control circuit changes from a high level to a low level, the NMOS transistor MN2 changes from an on state to an off state, and the gate G of the buzzer NMOS drive transistor keeps a low level. At the end of t1, The output N1 of the logic control circuit changes from a low level to a high level. Since the NMOS transistor MN2 is in an off state at this time, the power supply charges the gate G of the buzzer NMOS drive transistor through the MOS transistor MN1, and the buzzer NMOS The drive transistor is turned on. When the power supply voltage drops below the gate v...
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The invention provides a circuit for stabilizing the grid voltage of a driving tube of a buzzer. The circuit comprises a logic control circuit, an NMOS tube MN1 and an NMOS tube MN2, wherein the inputF of the logic control circuit is a frequency signal; the output N1 of the logic control circuit is connected to a grid electrode of the NMOS tube MN1; the output N2 of the logic control circuit is connected to a grid electrode of the NMOS tube MN2; a drain electrode of the NMOS tube MN1 is connected to a power line; a source electrode of the NMOS tube MN1 is connected to a grid electrode G of the NMOS driving tube of the buzzer; the substrate of the NMOS tube MN1 is connected to a ground wire; a drain electrode of the NMOS tube MN2 is connected to a grid electrode G of the NMOS driving tubeof the buzzer; a source electrode of the NMOS tube MN2 is connected to the ground wire; and the substrate of the NMOS tube MN2 is connected to the ground wire. According to the circuit, the opening time of the grid electrodes of the two NMOS tubes MN1 and MN2 is controlled through the logic control circuit, so that the function of preventing the grid electrode voltage of the NMOS driving tube of the buzzer from descending along with power supply voltage is achieved. The circuit has the advantages of simple structure and low cost.
Description
technical field [0001] The invention relates to the field of buzzer circuits, in particular to a circuit used for buzzers to stably drive the gate voltage of a tube. Background technique [0002] like Image 6 As shown, in the gate drive circuit of the traditional buzzer drive tube, when the power line voltage drops, the gate voltage of the buzzer drive tube drops along with the power line voltage, resulting in insufficient driving capability of the buzzer drive tube , and even cause the instability of the buzzer output frequency. SUMMARY OF THE INVENTION [0003] The invention provides a circuit for a buzzer to stabilize the gate voltage of a driving tube, when the voltage of the power supply line drops, to solve the problem that the gate voltage of the driving tube of the buzzer drops with the voltage of the power supply line, and prevent the power supply voltage from dropping When the buzzer drive tube has insufficient driving ability, it will even cause the instabilit...
Claims
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Login to View More IPC IPC(8): G05F1/56
CPCG05F1/56
Inventor 张怀东
Owner 无锡十顶电子科技有限公司