[SI-LIST] Re: Question on Common Mode Chokes and Unused Windings
- From: olaney@xxxxxxxx
- To: Erin.McPhalen@xxxxxxxxxxxxxxxxxxxxxxxxx
- Date: Mon, 9 Jul 2007 14:22:39 -0700
Whatever you do, don't ground both ends of the unused winding! I'd
recommend leaving it floating, but if you just can't help yourself,
ground one end.
Orin Laney
On Mon, 9 Jul 2007 14:03:25 -0700 Erin.McPhalen@xxxxxxxxxxxxxxxxxxxxxxxxx
writes:
> Hi
> We use a board level common mode choke, with 3 common mode
> windings. We
> currently only used 2 of the 3 windings. My question is what to do
> with
> the unused windings. I see 4 options here:
>
> a) Ground both sides
> b) Ground only 1 side
> c) Leave the unused winding floating
> d) Use a 2 winding choke(not actually an option for me)
>
> My concern is leaving an unintentional antennae on the board or
> interfere
> with the common mode rejection of the choke.
>
> Any insight would be greatly appreciated. Thanks in advance to any
> answers I get to this problem.
>
> Description:
>
> 3 Winding Common Mode Choke
>
> 1____(((((((((((____6
> 2____(((((((((((____5
> 3____(((((((((((____4
> =======
>
>
> Winding 1-6 and 2-5 are connected to signals leaving the EUT
> respectively.
>
>
> Winding 3-4 is unused, so I am not sure what would be the best
> treatment
> to this unused winding
>
>
> Erin
>
------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
or to administer your membership from a web page, go to:
//www.freelists.org/webpage/si-list
For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
List technical documents are available at:
http://www.si-list.net
List archives are viewable at:
//www.freelists.org/archives/si-list
or at our remote archives:
http://groups.yahoo.com/group/si-list/messages
Old (prior to June 6, 2001) list archives are viewable at:
http://www.qsl.net/wb6tpu
Other related posts:
