Jun. 13, 2022
With the development of science and technology, electronic products have become an indispensable item in people's daily life. Electronic products are equipped with many different electronic components, such as ceramic capacitors.
1. What is a ceramic capacitor?
Ceramic capacitor (ceramic condenser) uses high dielectric constant ceramic as the dielectric, spray silver layer on both sides of the ceramic substrate, and then the silver film is baked at high temperature as the electrode, the lead wire is welded on the electrode, and the surface is coated with protection enamel or encapsulated with epoxy resin. Its shape is mostly in the form of a sheet, but also has a tube shape, a circle and other shapes.
Ceramic capacitors used in the electronic field have the advantages of small size, high withstand voltage, and good frequency. With the development and progress of science and technology, ceramic capacitors have become an indispensable electronic component for electronic products.
2. Why do ceramic capacitors "scream"?
When using electronic products, sometimes you will hear noise. Although the sound is relatively small, you can still hear it if you listen carefully. what is this sound? Why does this sound when using electronic products?
In fact, this sound is caused by ceramic capacitors. Due to the high dielectric constant of ceramic capacitors, the material produces strong expansion and deformation under the action of an external electric field, which is called the piezoelectric effect. The violent expansion and contraction causes the surface of the circuit board to vibrate and emit sound. When the vibration frequency falls within the range of human hearing (20Hz~20Khz), noise will be generated, which is the so-called "howling".
Whether it is a notebook computer or a mobile phone, the requirements for power supply are getting higher and higher, so a large number of MLCC capacitors are connected in parallel on the power supply network, and it is easy to whistle when the design is abnormal or the load working mode is abnormal.
The above content is the reason why ceramic capacitors “squeak”.
Select a reliable manufacturer when purchasing ceramic capacitors can avoid a lot of unnecessary trouble. JEC original manufacturer not only has full models of ceramic capacitors with guaranteed quality, but also offers worry-free after-sales. JEC factories has passed ISO9001:2015 quality management system certification; JEC safety capacitors (X capacitors and Y capacitors) and varistors have passed the certification of various countries; JEC ceramic capacitors, film capacitors and super capacitors are in line with low carbon indicators.
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