Buzzer driving circuit and corresponding buzzer driving method

Abstract

The invention relates to a buzzer driving circuit and a corresponding buzzer driving method. The driving circuit comprises a control circuit module, a boost circuit module and a switch driving circuitmodule. The control circuit module is used for controlling the working state of the boost circuit module and the switch driving circuit module. The boost circuit module is used for boosting the voltage supplied by the voltage source and transmitting the boosted voltage to the switch driving circuit module. The switch driving circuit module controls the buzzer according to the signal outputted bythe control module. With application of the buzzer driving circuit and the corresponding buzzer driving method, the buzzer can be controlled effectively; meanwhile, functional control of the circuit can be realized by only using the common inductors and components in the circuit, the cost is low, the device volume is small, the current performance is stable and the buzzer works stably. When the driving circuit is in the standby state, the boost circuit module and the switch driving circuit module have no static power consumption, and thus the power consumption is low.

Description

technical field [0001] The present invention relates to the technical field of circuits, in particular to a drive circuit, in particular to a buzzer drive circuit and a corresponding buzzer drive method. Background technique [0002] The buzzer is often used in some alarm devices. The principle of driving the buzzer is as follows: add a square wave signal of a specific frequency to both ends of the buzzer, and in the positive half cycle of the square wave, the buzzer two The voltage difference at both ends of the buzzer is "positive"; in the negative half cycle, the voltage difference at both ends of the buzzer is "zero" or "negative". The greater the pressure difference between the two ends of the buzzer, the louder the buzzer sounds; when the buzzer sounds, the current flowing through the two ends of the buzzer is about several mA to tens of mA, the larger the current, the louder the buzzer will be. louder. With the popularization of CMOS technology, the products and chi...

AI Technical Summary

Problems solved by technology

Since the operating voltage and current on the buzzer are not directly switched during the on and off process, the loudness of the buzzer will be inconsistent when it is working.

[0005] The existing "single chip microcomputer + switch tube + three-terminal I-shaped inductor" control method has the following disadvantages: (1) The three-terminal I-shaped inductor is not easy to mass-produce, and the cost is high; Due to winding and other reasons, the inductance values ​​of inductors L13 and L32 have poor consistency, which leads to the inability to guarantee the consistency of the peak plate voltage on the buzzer BZ, and the loudness of the buzzer is inconsistent; (3) The volume of the three-terminal I-shaped inductor Larger, in some occasions it needs to be placed horizontally, which can easily cause the pins to break and fail

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