Buzzer driving method for realizing wide voltage input, and driving circuit

Abstract

The invention discloses a buzzer driving method for realizing wide voltage input, and a driving circuit. The method comprises the following steps: setting constant timing time and constant buzzer peakcurrent, after beginning driving a switch tube serially connected to a buzzer loop to conduct, sampling the current on the buzzer serial loop, when the sampling current reaches the set buzzer peak current, beginning timing, and regulating the impedance change on the switch tube through the feedback of the sampling current, enabling the current passing through buzzer on the serial loop to maintainthe constancy; immediately turning off the switch tube after the timing is finished, enabling the buzzer current to pass through a follow current loop, reducing the excitation energy to zero until the switch tube is conducted repeatedly, thereby forming a complete driving cycle. The sound pressure level consistency can be reached by controlling the consistency of the current passing through the buzzer, and the consistency of the maintaining time of the current.

Description

technical field [0001] The invention relates to a buzzer control method, in particular to a buzzer driving method and a driving circuit applied to an electromagnetic buzzer to realize wide voltage input. Background technique [0002] The buzzer is an electronic sounder, which is widely used in the fields of alarms, electronic toys, timers, computers, printers, small appliances, etc. Among them, the buzzer is divided into electromagnetic type and piezoelectric type, and the piezoelectric type is generally used In larger occasions, the electromagnetic buzzer is generally used in some miniaturized occasions. The electromagnetic buzzer is composed of an oscillator, an electromagnetic coil, a magnet, a vibrating diaphragm, and a casing. The alternating current of a certain frequency passes through the electromagnetic coil to make it The electromagnetic coil generates a magnetic field, and the vibrating diaphragm vibrates periodically to produce sound under the interaction of the ...

AI Technical Summary

Problems solved by technology

[0006] We can see that the sound pressure level has changed by 10dB within this voltage range, and the power consumption has increased from 45.3mW to 636mW, while the maximum power consumption of a general buzzer cannot exceed 250mW, otherwise the performance may be reduced due to heat generation or reduced reliability

Therefore, buzzer manufacturers need to design and manufacture corresponding models under different input voltages according to the actual client voltage (usually 3V-24V at most), which greatly increases the design and manufacturing costs.

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