choke for the power supply

[jarthel]

I was looking at kk-pcb.com and they sell several pcbs for the power supply.

http://www.kk-pcb.com/power-4.html

Can someone point me to manufacturer's site for a choke that can handle 35A?

The largest I've seen is from Hammond and they were only up to 10A.

Thank you.

[Stefanoo]

choke air core?

interesting question...i remeber i posted it once without any reguarding answer.

Let's see.

I actually need a air choke 2.2mH (with no more than 0.38mohm) that can handle 25-30A.

I remember somebody suggesting me to build one bymyself... it could be a suggestion as well

[jarthel]

Originally posted by Stefanoo
choke air core?

aren't those used for speakers?

I was looking at an electronics catalog months ago and I found different type of choke/inductors. There's RF, EMI, ferrite bead and many others.

I have a feeling you can't just use one type of inductor for power supply filtering.

[jarthel]

there's something called common-mode chokes and I've seen people used it in tube amps. look at lundahl.se

anyway, there a 4.4mH 5A cmc in alliedelec.com. not sure if the current rating is enough for your purpose.

[Stefanoo]

[Apex Jr]

I have some 8 mH at 16 Amp Toroid chokes

www.apexjr.com/images/AVEMCOMAGNETICS.jpg
click on picture for larger size

There $20.00 ea and weigh 7 lbs each

Steve @ Apex Jr.

[Stefanoo]

Is there any air core choke that can handle 22-25A?

As far as i know air core, compared with iron core has a better sound eather used on the loudspeaker filter, output zobel network or power supply clc filter....or whatever.

I just would like to know if there are chokes with this specifics o if it's possible to make chikes like that....i would personally prefer to find something well made personally

[jarthel]

Originally posted by Stefanoo
Is there any air core choke that can handle 22-25A?

As far as i know air core, compared with iron core has a better sound eather used on the loudspeaker filter, output zobel network or power supply clc filter....or whatever.

are you saying one can use speaker inductors in power supplies?

There are different kinds of chokes/inductors. And I believe you can't just use one type can be applied for another application.

[darw82]

Originally posted by Stefanoo
Is there any air core choke that can handle 22-25A?:

Sure, air core choke will never saturate. The only limitation in air core choke is the wire. The larger the wire diameter, the more current it can handle.

[Magura]

Sure an air core can handle 25A if the wire gauge is big enough. The trouble starts when you want to buy such off the shelf.....that is as far as I know a "no can do" situation.

I have made quite many such powerfull inductors, they're big, and very expensive these days, as the copper price has trippled over the last couple of years.

So if you feel like letting go of like at least 80 EUR a piece, keep searching for a manufacturer, otherwise just go for a couple of the toroid chokes from apex.jr in parallel.

Magura