EFT suppress on notebook DC power cable?

[Roger Liu]

Hi, All

I noticed that on my notebook DC power cable there is a cylinder between the
DC converter and the output plug on my notebook. And on many consumer
electronics products such as Digital camera, that cylinder object also
exists. I guess that there is a EFT choke coil inside it. Is that right? If
so, is there any information on that? For example, Standard, Spec, Product
Ads...

I am interested on that because recently I am doing a project for suppress
EFT on nano order. Neither diode or TVS could suppress that kind of EFT.


Thanks and Regards

Roger

 

[Peter A Forbes]

On Thu, 19 Aug 2004 10:09:21 +0800, "Roger Liu" <w20761@motorola.com> wrote:

Hi, All

I noticed that on my notebook DC power cable there is a cylinder between the
DC converter and the output plug on my notebook. And on many consumer
electronics products such as Digital camera, that cylinder object also
exists. I guess that there is a EFT choke coil inside it. Is that right? If
so, is there any information on that? For example, Standard, Spec, Product
Ads...

I am interested on that because recently I am doing a project for suppress
EFT on nano order. Neither diode or TVS could suppress that kind of EFT.


Thanks and Regards

Roger

It's normally a ferrite core through which the cable passes, I don't think there
is a full loop of cable through/around the core. Similar things are used on the
better quality monitor leads and Epson fit them a lot on their PSU's for
scanners etc.

You can buy clip-over cores with plastic covers from the main distributors.

Peter

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Peter & Rita Forbes
diesel@easynet.co.uk
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