Searching \ for 'capacitor ripple current' in subject line. ()
Make payments with PayPal - it's fast, free and secure! Help us get a faster server
FAQ page: piclist.com/techref/power.htm?key=current
Search entire site for: 'capacitor ripple current'.

Truncated match.
PICList Thread
'capacitor ripple current'
2005\08\14@014014 by Vasile Surducan

face picon face
On 8/14/05, Martin Klingensmith <spam_OUTmartin-distlistsTakeThisOuTspamnnytech.net> wrote:
> Hello all,
> If a capacitor is rated at 1A ripple current at 50kHz, is this a
> continuous rating based on power dissipation due to internal resistance?

 Yes it's a continuous rating at a maximum temperature, based on the
capacitor reactance.

>
> I'm designing a motor controller that should be able to handle peaks of
> 100A or more for fractions of a second and I'm trying to figure out what
> the capacitors can handle.

Will need special capacitors, and I'm guessing that will be more than
one. The problem might be also the voltage level of this capacitor.

cheers,
Vasile

> Thanks
>
> --
> Martin Klingensmith
> http://wwia.org/
> http://nnytech.net/
>
> --

2005\08\14@022412 by David Van Horn

picon face


-----Original Message-----
From: .....piclist-bouncesKILLspamspam@spam@mit.edu [piclist-bouncesspamKILLspammit.edu] On Behalf
Of Vasile Surducan
Sent: Sunday, August 14, 2005 12:40 AM
To: Microcontroller discussion list - Public.
Subject: Re: capacitor ripple current

On 8/14/05, Martin Klingensmith <.....martin-distlistsKILLspamspam.....nnytech.net> wrote:
> Hello all,
> If a capacitor is rated at 1A ripple current at 50kHz, is this a
> continuous rating based on power dissipation due to internal
resistance?

 Yes it's a continuous rating at a maximum temperature, based on the
capacitor reactance.

Jim Williams of Analog Devices, has a good formula for this.
Several terms, and the results can be quite interesting.
I used the formula for a particularly difficult thermal printer design,
and it suggested that three really cheap caps would be better than one
expensive "low ESR" model.  I went with the guidance, and that worked
out very nicely.
There are scads of systems in the field now, but essentially no
failures. :)

I don't seem to have the right book on hand, so I can't quote it
directly.
Perhaps someone else out there does?



More... (looser matching)
- Last day of these posts
- In 2005 , 2006 only
- Today
- New search...