Jiangsu HUAWHA Electronics Co., Ltd.

With electronic products developing fast, sound prompts are an indispensable part of human-machine dialogue. Piezo electric buzzer is broadly applied in the electronic products because of its small volume, low energy consumption and quick response. Then, how is the Piezo electric buzzer configured? What are different types of Piezo Buzzers and their characteristics and applications? This article will reveal the secret of Piezo electric buzzer for you.

What is Piezo electric buzzer?

Piezo electric buzzer is a kind of electroacoustic transducer. It is based on the piezoelectric effect. "piezoelectric effect" is the deformation of a dielectric (e.g., piezoelectric ceramics) when an electric field is applied thereto or the generation of an electric field, when the dielectric is stressed. The piezoelectric buzzer takes advantage of this property and converts electrical signals into sound signals, thus achieves a sound function. Compared with electromagnetic buzzer, piezo buzzer has the advantages of simple structure, low cost and long life, and plays an important role in modern electronic products.

How does the Piezo buzzer work

Piezoelectric effect mechanism

The piezoelectric ceramic plate is the main part of the piezo electric buzzer. When the pulse AC voltage is added to the two electrodes of the piezoelectric ceramic plate, the ceramic plate generates a cycle of expansion and contraction deformations under the electric field action based on the piezoelectric effect. This deformation will push the vibration membrane, which is connected with it, to vibrate in the air, a force then vibrates the air, and eventually releases the sound. The voltage frequency controls the vibrational frequency (the pitch of the sound) and the voltage amplitude controls the oscillation amplitude (the loudness of the sound).

Collaborative work of drive circuit

Piezo electric buzzer bule itself can't make sound,It needs to be processed in the drive circuit. Common drive circuits include: self-excited oscillation circuit and other-excitation oscillation circuit. The self-exciting oscillation circuit can offer a frequency drive signal of a certain frequency to the Piezo electric buzzer, so that the buzzer may sound at a certain frequency. The others excitation oscillation circuit, and the other exciting oscillation circuit, are a circuit using an external signal source, it is possible to achieve a flexible frequency control, there is sometimes used in applications requiring a change the tone by the external signal source. Drive circuit and Piezo electric buzzer between, so that buzzer to the stable, accurate sound.

The main types and characteristics of Piezo electric buzzer

SMD piezo buzzer

The SMD piezo buzzer uses surface mount technology (SMT), has an ultra-small size and is ultra-thin, and is especially suitable for use in high-integrated electronics such as: mobile phones, smart watches, wireless headphones, etc. Patch design makes it can be mounted by machine and soldered directly on the PCB (Save installation time, Robust design). Excitingly, SMD piezo buzzer offers stable and reliable performance, good anti-interference ability, and strong ability to normally work in the complex electromagnetic environment.

In consumer electronics, SMD piezo buzzers are widely used to provide an audible alarm or to provide sound for various portable equipments. For instance, the mobile phone’s key tone and the input tone of short message, the call prompt of the smart watch, the sports goal attainment prompt, and so on, all these are achieved by the SMD piezo buzzer. It is compact in size, does not take up a lot of space, but it offers clear sound response timely.

Micro piezoelectric buzzer

The mini piezo buzzer can still ensure the sound performance with smaller size and weight. It is small in size and easy to install. It can be also resolved by welding, clips and double-sided tape, etc. Operating Voltage The mini piezo buzzer has a broad operating voltage The buzzer beeper ranging from low Voltages for battery powered applications to higher voltages for industrial applications. It has high quality frequency response and can produce clear and beautiful sounds.

Mini piezo buzzer are widely used in medical equipment, intelligent villa, toys and so on. For instance, in the medical apparatus it is used for the completion sound of measurement-blood pressure gauge, blood sugar instrument; in the smart home appliance, it can be used for unlocking sound of smart lock, alarm sound of smoke sensing; in the toy application, the mini piezo buzzer could increase all kinds of interesting sound effects to toys so that make the product become more interesting and attractive.

Applications of Piezo electric buzzer

Consumer electronics

Piezo electric buzzer is everywhere in consumer electronic products. So it is not only the prompt tone of the mobile phones, watches, and various other devices said above, but also the power-on tone, alarm tone of the tablet computer, even the paired succeed tone of Bluetooth speakers are adopted Piezo electric buzzer to achieve the effect. It gives the user an audible feedback, making it easy for the user to use/interact the device.

Industrial control field

In industrial production, Piezo electric buzzer are used in status indications of countless devices and fault alarm in equipment. Such as the abnormal operation alarm of equipment on the automated production line, the processing completion reminder of the machine tool, the overload alarm of the power equipment, and so on. Sponsored Ads II、Application: 1、Industrial field As the industrial field environment is generally relatively poor, such as high noise, strong electromagnetic interference, and so on, the high sounding and anti-interference of Piezo electric buzzer used in industrial control Home made Piezo electric buzzer makes it especially suitable for use in the industrial control field, so that personnel can get timely information of the equipment to ensure the production safety.

Automotive electronics field

Piezo electric buzzer has also been used in automotive. Rear reversing radar distance prompt sound, large screen for showing air-condition value, etc, all of these are included in this great system to make a better driving experience for you. Do you want to try it?The distance prompt sound of the reversing radar and the alarm sound of not locking the seat belt and not closing the door are implemented by Piezo electric buzzer. Detailed Description It has clear sound alarm, to help drivers safe driving, reduce traffic accidents.

Security and alarm fields

Piezo electric buzzer is a main kind of alarm in security system. Whether it's the intrusion alarm of the home anti-theft system, the fire alarm sound of the smoke detector, or the alarm of the gas leak alarm, the Piezo electric buzzer can send out a loud and penetrating sound and tell the people to do the timed countermeasures, make life and property more secure.

Key points how to select a Piezo buzzer

Type are depend on application scenarios

If your small electronics you are making are highly integrated, the smd piezo buzzer is more suitable for your space requirement; if you only have a small limited space to install, then the mini piezo buzzer is a good choice. In other desired industrial and safe fields, which require a buzzer with high sound loudness and sound performance, the power performance characteristics of the buzzer should be comprehensively considered.

Track your key performance indicators

Voice frequency: Different use environment for sound decibel has different requirements and need to choose Piezo electric buzzer with proper frequency according to the actual use needs.

Sound pressure level: It reflects the loudness of a sound. If long-distance transport or use in a noisy environment, you also need to select a buzzer with a larger sound pressure level, so as to guarantee the sound to be heard clearly.

Working Voltage and Current: the working voltage and current of the Piezo electric buzzer shall be compatible with the power system of the equipment, so that the absorb or non-working of the buzzer will not occur due to the voltage and current cannot be used in conjunction with the equipment.

The significance of selecting a quality piezo buzzer factory

The reliability and service life of the Piezo electric buzzer has a great relationship with the buzzer’s performance and quality. Selecting professional piezo buzzer manufacturer can ensure the quality of products that are suitable. Professional manufacturers have fine production technology and strict quality control system. Each link from raw material to product delivery is strictly supervised to guaranteed the high quality and long life of the Piezo electric buzzer.

Among the numerous piezo buzzer manufacturers, HUAWHA stands out for its professional r & D team, rich production experience and excellent product quality. Huawha focuses on the development and manufacturing of Piezo electric buzzer, providing various types of products including SMD Piezo buzzer and mini Piezo buzzer to meet the needs of different industries and scenarios. Whether it is consumer electronics, industrial control, or automotive electronics, security alarm field, Huawha can provide customized solutions according to customer needs. From product design, manufacturing to after-sales service, Huawha strictly control every link, is committed to providing customers with high-quality, reliable Piezo electric buzzer products.

If you are looking for a reliable Piezo electric buzzer, HUAWHA will be your ideal choice. Choose Huawha, is the choice of professional, quality and trust, for your electronic devices to add a reliable sound partner.