Hello,
I am trying to calculate the ESR of some high voltage capacitors so I can model them in LTSpice.
Taking an 8kV CG0 capacitor with 6.8nF of capacitance, and a dissipation factor of maximum 0.1% @ 25 degrees celcius, the calculation yields:
ESR = DF/Xc = 0.1/(2*pi*1MHz*6.8^10-9)
= 2.341Ohms.
Now, I am no expert, but that seems quite large of an ESR for a NPO/COG capacitor, despite even the high voltage.
I know that the ESR of the capacitor is directly related to transient response. Therefore this high value of ESR will probably cause a large deviation in output voltage, which I definitely am not able to tolerate with my converter.
I used 1MHz because the data sheet tends to specify their data at this frequency. Maybe this is where I am going wrong.
The reason I looked into C0G was because it was supposed to have much lower ESR than other high voltage capacitors and is stable over the operating temperature, freq. etc... but the ESR seems to be no better, leading me to believe I'm probably misunderstanding something.
I am trying to calculate the ESR of some high voltage capacitors so I can model them in LTSpice.
Taking an 8kV CG0 capacitor with 6.8nF of capacitance, and a dissipation factor of maximum 0.1% @ 25 degrees celcius, the calculation yields:
ESR = DF/Xc = 0.1/(2*pi*1MHz*6.8^10-9)
= 2.341Ohms.
Now, I am no expert, but that seems quite large of an ESR for a NPO/COG capacitor, despite even the high voltage.
I know that the ESR of the capacitor is directly related to transient response. Therefore this high value of ESR will probably cause a large deviation in output voltage, which I definitely am not able to tolerate with my converter.
I used 1MHz because the data sheet tends to specify their data at this frequency. Maybe this is where I am going wrong.
The reason I looked into C0G was because it was supposed to have much lower ESR than other high voltage capacitors and is stable over the operating temperature, freq. etc... but the ESR seems to be no better, leading me to believe I'm probably misunderstanding something.