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Hi, last week I've got some parts from 6kW HV powersupply. I am curious about theese big caps, i've never seen anything like it before, its a 220uF/300VDC film caps they were connected like its on circuit. What for is this topology good for? How can i use theese caps, in TCs? like a decoupling caps? etc... thx -Martin
Registered Member #1225
Joined: Sat Jan 12 2008, 01:24AM
Location: Beaumont, Texas, USA
Posts: 2253
Proud Mary wrote ...
bwang wrote ...
They are not meant for tank circuits; no ripple handling capabilities.
I would call 150A RMS current fairly meaty.
I would call that statement fairly true
They are made for very high ripple current (that is the 150 amp rating), but they are made for DC, so aren't suitable for anything that will pass AC through them such as a tank circuit. However they would indeed make really awesome decoupling caps like in that schematic, though i'm sure it is still a good idea to use another decoupling cap of a lower value directly across the terminals of the bridge. Due to the size of those capacitors and how they are mounted there is bound to be some stray inductance between them and a bridge. The typical low ESR/ESL poly cap on the bridge will take care of that.
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
Arcstarter wrote ...
Proud Mary wrote ...
bwang wrote ...
They are not meant for tank circuits; no ripple handling capabilities.
I would call 150A RMS current fairly meaty.
I would call that statement fairly true
They are made for very high ripple current (that is the 150 amp rating), but they are made for DC, so aren't suitable for anything that will pass AC through them such as a tank circuit. However they would indeed make really awesome decoupling caps like in that schematic, though i'm sure it is still a good idea to use another decoupling cap of a lower value directly across the terminals of the bridge. Due to the size of those capacitors and how they are mounted there is bound to be some stray inductance between them and a bridge. The typical low ESR/ESL poly cap on the bridge will take care of that.
Doesn't the ripple current flow through them, then?
I saw in the datasheet that the capacitor was designed for DC filtering operation, but as it is not polarised, I can only imagine that it might have to be de-rated for AC use, having regard to dielectric and ohmic losses, hot spot calculation, and so on.
Registered Member #2919
Joined: Fri Jun 11 2010, 06:30PM
Location: Cambridge, MA
Posts: 652
If you're thinking about using them for reactive power handling, I would advise against it. 220 uF is a lot of capacitance for such a small film cap; the big snubbing versions of those are about the same size, and only ~5 uF.
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Big power film caps
