Year1
- 电压：
- 16V
- 容量：
- 2.2UF
- 封装尺寸：
- 1.6*0.8
Therefore the charging current is defined as
When the voltage applied to the capacitor is volts, the charging current is amperes, and the charging time is seconds, we define the capacitance as
farads.
Coulomb
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Since Farad is a large unit of measurement, it is difficult to achieve in actual use, so it is usually used is the fraction of Farad, gen
Picofarad (
Nanofarad (
'
Microfarad (
'
. Factors affecting capacitance
For any given voltage, the capacitance of a single-layer capacitor is proportional to the device geometry and dielectric constant
Dielectric constant
Electrode area
Dielectric layer thickness
Conversion factor
In the imperial unit system, the unit of size and sum is expressed in inches, and the capacitance is expressed in picofarads. For a single-layer capacitor, for example, the electrode area. The thickness of the dielectric layer. ", the dielectric constant,
(.) (.) (.
If the metric system is used, the conversion factor, the size unit is changed to,
(.) (.) (.
As discussed previously about the relationship between capacitance and geometric size, increase Larger electrode area and reduced dielectric layer thickness can both obtain greater capacitance. However, for single-layer capacitors, it is impractical to endlessly increase the electrode area or reduce the dielectric layer thickness. Therefore, parallel columns The concept of array chip capacitor
was proposed to manufacture a complete device with a larger specific volume capacitance, as shown in the figure below.
Internal electrode
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In this multi-layer structure, due to the parallel arrangement of multi-layer electrodes and the very thin dielectric layer between opposite electrodes, the electrode area is greatly increased, so the capacitance will increase with the factor ( The number of dielectric layers) increases and the thickness of the dielectric layer decreases. Here ' refers to the overlapping area of the overlapping electrodes.
,
(
,)
The capacity previously obtained on a monolithic capacitor of ." can now be obtained by using the same dielectric material and stacking layers of dielectrics with a thickness of ." into a multi-layer component with a size of only ." (here the electrodes overlap Area' is〃).
(.) (.) (.
External electrode
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The above example shows that the multilayer structure capacitor can still provide the same capacitance when the size is smaller than that of the single layer capacitor. Therefore, by optimizing the geometric size, By selecting a dielectric material with a very high dielectric constant and good electrical properties (able to maintain good insulation resistance and dielectric strength after forming a thin layer structure), components with a capacitance volume coefficient can be designed and manufactured.
.
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