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High voltage capacitors choices

Sniper2 , 10-14-2024, 07:29 PM
So for a AFPC i need like 600-700uF @400 V so 450V rated caps
Is it standard to use a lot of 450V electrostatics or use larger 250V electrostatics is series?
Asking since i dont seem to find a lot of cap manufacturers for that voltage range.
QDrives , 10-15-2024, 07:19 PM
Putting 2 capacitors in series halfs the capacitance.
So 2x voltage 1/2x capacitance.

Looking in Digikey, there is not that much more choise for 250V+ compared to 400V+.

The only time I remember using 2 capacitors in series were 2x 450V 10mF monsters. And multiple of them in parallel too.
Sniper2 , 10-15-2024, 08:07 PM
then u must have worked on a monster too
Sniper2 , 10-15-2024, 08:09 PM
those are like 80E a pop
Sniper2 , 10-15-2024, 08:09 PM
man that is expensive
Sniper2 , 10-15-2024, 08:09 PM
there are even 300E caps out there WOW
Sniper2 , 10-15-2024, 08:09 PM
then again mouser prices
QDrives , 10-15-2024, 09:02 PM
It was used with a 3 phase 480V, 70Arms continues drive to control the motor for a professional flight simulator.
The DC bus voltage could go up to 675V.
If I recall correctly (could be 20 years ago), they may have used a bank of 12 caps per drive.
Something like 10cm diameter and 15cm height (each capacitor).
Sniper2 , 10-15-2024, 09:03 PM
WOW that is MASSIVE
QDrives , 10-15-2024, 09:18 PM
The capacitor bank was about the same size (volume) as the drive itself.

But more importantly, what about your question?
Sniper2 , 10-16-2024, 04:13 AM
Yea I'll stick to 450v ones
Sniper2 , 10-16-2024, 04:13 AM
I need like 600uf only* anyway
Sniper2 , 10-16-2024, 04:14 AM
In practice less since I will never reach theoretical max load
Sniper2 , 10-16-2024, 04:14 AM
Well unless I try
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