The structure of the piezo buzzer
The piezoelectric buzzer is made of a piezoelectric ceramic material, and its core part is a piezoelectric ceramic plate. Ceramic sheets are usually thin circular objects with good piezoelectric effects. In addition to ceramic sheets, the buzzer also includes a metal cover plate and electrode sheets.
The working principle of the piezo buzzer
The working principle of a buzzer mainly depends on its type, which is mainly divided into electromagnetic and piezoelectric types.
The working principle of an electromagnetic buzzer is that the electromagnetic coil and magnet vibrate periodically to produce sound. Specifically, after the power is turned on, the audio signal current generated by the oscillator passes through the electromagnetic coil, causing the electromagnetic coil to generate a magnetic field. The vibrating diaphragm periodically vibrates and produces sound under the interaction between the electromagnetic coil and the magnet.
The working principle of a piezoelectric buzzer is to apply a voltage to both ends of the piezoelectric material and metal sheet. Due to the reverse piezoelectric effect, the buzzer sheet will undergo mechanical deformation and produce sound.
How to Use Piezoelectric Buzzers
The use of the piezo ceramic buzzer was discovered thanks to an inversion of the piezoelectricity principle that was discovered by Jacques and Pierre Curie back in 1880. They found that electricity could be generated when a mechanical pressure was applied to particular materials — and the inverse was true as well.
So when certain piezoelectric materials are subjected to an alternating field of electricity, the piezo buzzer element — often a manmade piezoceramic material — stretches and compresses in sequence with the frequency of the current. As a result, it produces an audible sound.
Unlike magnetic buzzers that have a narrow operating voltage of somewhere between one and 16 volts, piezo buzzers can typically operate anywhere between three and 250 volts. In addition, magnetic buzzers have a higher power consumption of 30 to 100 milliamperes, while piezo buzzers normally consume less than 30 milliamperes — even at higher rate frequencies. And although piezo buzzers require a larger footprint than magnetic buzzers, they produce a higher sound pressure level.
Applications of a Piezo Buzzer
Thanks to both the reliability and flexibility of piezoelectric vibration plates to produce audible signals — ranging from monotone buzzes and alarms to multi-tones and melodies — their applications in small, high-density assemblies are wide-ranging. What’s more: Their low power consumption makes them ideal for many battery-operated devices.
With such characteristics, piezo buzzers are regularly used in alarms, warning devices and automobile alerts. In addition, since they can produce a wide range of audible signals, they’re also used in pest deterrent devices. And in the consumer electronics field, some of their most popular applications include sound generators in computers, telephones, toys and games — to name just a few.
Copyright © 2021 NINGBO FBELE ELECTRONICS CO.,LTD. All Right Resrved Designed by www.followala.com
Welcome to text me on WhatsApp or send me an email to sales@fbelec.com