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Old 26th March 2010, 08:02 PM   #1
a.wayne is offline a.wayne  United States
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Default CAPS ! One big or 4 small ?

Hello Gents ,

which do you prefer , large caps or multi-small caps ?



regards,
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Old 26th March 2010, 08:16 PM   #2
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It depends to some extent on the room you have for the caps. If room is not an issue, then I prefer multiple small caps.
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Old 26th March 2010, 08:39 PM   #3
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Default Caps

Multiple Caps, Are better
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Old 26th March 2010, 08:40 PM   #4
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I would have to agree with Steve, with a caveat. If you have the room for larger caps, then you have room for multiple smaller ones, and vice versa. The advantage with smaller caps I can think of:
1) Lower possible inductance
2) Lower possible ESR
3) Better High Freq. filtering (see above)
4) you can potentially use a lower profile enclosure for the whole shebang.

Peace,

Dave
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Old 26th March 2010, 08:58 PM   #5
a.wayne is offline a.wayne  United States
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thanks guys , consensus is for multi-caps ....
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Old 28th March 2010, 03:02 AM   #6
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Smaller caps have more surface area = more cooling capacity. I use a hundred 0.1uF's in parallel for my induction heater tank cap -- it's the only way to handle 200A with off the shelf components. Big SMPS may need a few caps in parallel for filtering if the switching draws big current pulses (e.g., huge flyback supply), when ripple current can be fairly high. Check the datasheet: in most cases, you can get away with just a few units, even for the most punishing of circuits.

If the question includes line frequency filters, *never* worry about them: there isn't an electrolytic in the world that isn't rated for line frequency filtering. It's just too easy.

Tim
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Old 28th March 2010, 05:46 AM   #7
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Another vote for multiple small caps.
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File Type: jpg caps.jpg (148.8 KB, 237 views)
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Old 30th March 2010, 04:22 AM   #8
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Well, as long as we're posting pictures...

Click the image to open in full size.

Click the image to open in full size.
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Old 31st March 2010, 12:46 AM   #9
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Quote:
Originally Posted by Sch3mat1c View Post
Well, as long as we're posting pictures...

Click the image to open in full size.

Click the image to open in full size.

Show off!

So what's the assembly with the copper piping for? Liquid cooling, high current, or a waveguide?

Peace,

Dave
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Old 31st March 2010, 02:57 AM   #10
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High current AND liquid cooling. It has to carry 460 amperes (reactive) at full ratings. 20uF 630VDC (250VAC), delivers maximum rated VARs at 10-20kHz (250VAC * 460A = lots of VARs).

I think it would suffice as a bypass cap for something of Pass' design.

Tim
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