It calculates the capacity of a capacitor realized with the
dielectric and the costructive parameters choosen.
Realize a capacitor can be useful in those applications where a commercial
does not exist, normally it is the particular case of high voltage or
capacitor realized on PCB, this case treats of little capacity used
in high frequency circuit.
Kind of dielectric (insulator)
Medium dielectric constant
Medium dielectric rigidity
(perforation voltage)
kV*mm
Notes on perforation voltage
Dielectric thickness
mm
Surface of an element (if stratified)
Total surface (if winded)
cm2
Number of element in parallel
n. (only one if winded)
| Results | |||
| Total capacity | pF | ||
| nF | |||
| µF | |||
| Dielectric voltage perforation | V | ||
Notes on dielectric.
Do not reach the perforation voltage, better if it is three times the
peack-to-peak working voltage of the same capacitor.
For some dielectric such as gas or other materials with an high moisture content,
make the thickness higher does not correspond to a proportional increase of
the perforation voltage, being impossible manage without the recorded parameters of
any dielectric at any thickness, it is treated in linear way,
for the dielectrics on the list is necessary realize some experimental prototype
to obtain more accurate data.
The dielectric constant always refers to a frequency, normally 1 MHz, because some dielectrics have a different behaviour at different frequencies, also in this case the moisure contained in the same dielectric has effect on the variation of dielectricity to different frequency.
Notes on temperature.
When capacitor must dissipate important quantity of thermic energy
is necessary value the used material, plastics for example,
make them weaker at relative low temperature making closer the conductive layers,
conseguently the perforation voltage decreases.