What is a ceramic capacitors

Production principle

 
With a high dielectric constant ceramic capacitor <barium titanate dioxide> squeezed into a tube, wafer or disc as a medium and as an electrode made ​​of silver-plated ceramic burn infiltration. It also points to the high-frequency ceramic and low-frequency ceramic two. A small positive temperature coefficient of capacitance capacitors for high stability oscillator circuit as a circuit capacitors and permaliner. Low-frequency ceramic capacitors are limited to lower operating frequency bypass circuit with a DC blocking, including high frequency stability and loss less demanding situations <>. Such capacitors should not be used in the pulse circuit, because they are easy to be a pulse voltage breakdown.
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Classification

Can be divided into the plug-in and SMD ceramic capacitor in accordance with the package! In accordance with the different media can be divided into Class I ceramic capacitors and class II ceramic capacitors, usually NP0, SL0, COG Class I ceramic capacitors, X7R, X5R, Y5U, Y5V ceramic capacitors of Class II and Class I ceramic capacitors capacitance stability is very good, basic does not vary with changes in temperature, voltage, time changes, but most are very small capacity, class II ceramic capacitance stability is poor, with the variation of temperature, voltage, time, generally used in the stability of the capacity in less demanding situations, such as filtering and so on!
Important parameter:
Capacitance
2. Rated voltage
3 Tolerance
4 Size
C = (εoεr A) / d
εo is the permittivity of free space
εr is the relative dielectric constant
A is the area of ​​a plate
d is the separation between the plates.
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Advantages and disadvantages

Advantages: stability, good insulation, high pressure;
Disadvantages: capacity is relatively small.
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Use

High voltage ceramic capacitors used in the field of high-power, high-pressure, requires a small, high withstand voltage and frequency characteristics. With the material, electrode and manufacturing technology, the development of high voltage ceramic capacitors has made ​​considerable progress, and to obtain a wide range of applications. High voltage ceramic capacitors has become an indispensable component of the high-power high-voltage electronic products.
The use of high voltage ceramic capacitors are divided into power transmission and distribution system of power equipment and processing pulse energy equipment.