RMS Current Rating for MMKP capacitors for QCW?
TeslaRay, Sat Aug 08 2015, 07:03PMGood morning everyone,
I am attempting to build a QCW type Tesla Coil for a project at my university. I am now working the design of the primary capacitor which needs to be approximately 0.01uF.
I am looking at using these capacitors as we have a supply of them in our lab.
Vishay MMKP 383 Series
Does anyone have an idea of what an RMS current rating would be on these particular types of capacitors?
MT
Re: RMS Current Rating for MMKP capacitors for QCW?
Mads Barnkob, Sat Aug 08 2015, 07:54PM
Vishay gives you the information needed on page 6 in their general introduction to their film capacitors:
Mads Barnkob, Sat Aug 08 2015, 07:54PM
Vishay gives you the information needed on page 6 in their general introduction to their film capacitors:
Re: RMS Current Rating for MMKP capacitors for QCW?
TeslaRay, Sun Aug 09 2015, 11:27AM
Thank you for the information Mads Barnkob.
I have reviewed the document, but could not find information on Page 6. Did you link the correct document? Page 6 lists only test information, mostly mechanical, about the capacitor.
There is some power information on Page 5, but that only shows how to determine the actual dissipation of the capacitor in operation.
Is there something i am missing on how to calculate the max. theoretical RMS current of a capacitor using this information?
Thank you again
MT
TeslaRay, Sun Aug 09 2015, 11:27AM
Thank you for the information Mads Barnkob.
I have reviewed the document, but could not find information on Page 6. Did you link the correct document? Page 6 lists only test information, mostly mechanical, about the capacitor.
There is some power information on Page 5, but that only shows how to determine the actual dissipation of the capacitor in operation.
Is there something i am missing on how to calculate the max. theoretical RMS current of a capacitor using this information?
Thank you again
MT
Re: RMS Current Rating for MMKP capacitors for QCW?
Mads Barnkob, Sun Aug 09 2015, 08:00PM
Its on the document page 6, which is the pdf page 5. But I am sorry, I missed that the current formula there was a part of power dissipation calculation and not a RMS calculation in itself.
I do however still think you need to look at their general documention to find the answer, this is the case with WIMA capacitors.
Mads Barnkob, Sun Aug 09 2015, 08:00PM
Its on the document page 6, which is the pdf page 5. But I am sorry, I missed that the current formula there was a part of power dissipation calculation and not a RMS calculation in itself.
I do however still think you need to look at their general documention to find the answer, this is the case with WIMA capacitors.
Re: RMS Current Rating for MMKP capacitors for QCW?
Wolfram, Mon Aug 10 2015, 02:06AM
The RMS current rating is hidden within the RMS voltage vs. frequency graphs. Pick any point on the diagonal line for the given capacitor, and find the corresponding frequency and voltage for this point. Calculate the impedance of the capacitor at this frequency (Z = 1/(2*pi*F*C)). Divide the voltage at the point you selected by this impedance to get the RMS current rating of the caps.
Wolfram, Mon Aug 10 2015, 02:06AM
The RMS current rating is hidden within the RMS voltage vs. frequency graphs. Pick any point on the diagonal line for the given capacitor, and find the corresponding frequency and voltage for this point. Calculate the impedance of the capacitor at this frequency (Z = 1/(2*pi*F*C)). Divide the voltage at the point you selected by this impedance to get the RMS current rating of the caps.
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